{"id":30306,"date":"2026-07-21T16:04:32","date_gmt":"2026-07-21T08:04:32","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30306"},"modified":"2026-07-21T16:04:32","modified_gmt":"2026-07-21T08:04:32","slug":"outdoor-telecom-cabinet-spd-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/","title":{"rendered":"Guide de s\u00e9lection des SPD pour l'armoire de t\u00e9l\u00e9communications ext\u00e9rieure"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30306\" class=\"elementor elementor-30306\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-91d8c03 e-flex e-con-boxed e-con e-parent\" data-id=\"91d8c03\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4fea209 elementor-widget elementor-widget-html\" data-id=\"4fea209\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!--\r\nCUSTOM HTML CONTENT ONLY\r\n\r\nThe WordPress theme or SEO plugin should generate:\r\n- Breadcrumb\r\n- H1\r\n- Author \/ date metadata\r\n- Article schema\r\n- Breadcrumb schema\r\n\r\nH1:\r\nOutdoor Telecom Cabinet SPD Selection Guide\r\n\r\nSEO TITLE:\r\nOutdoor Telecom Cabinet Surge Protection Guide | LEEYEE\r\n\r\nMETA DESCRIPTION:\r\nSelect SPDs for outdoor telecom cabinets, including AC input, 48V DC power, RJ45, PoE, signal lines, remote alarm, grounding and condensation control.\r\n\r\nURL:\r\n\/outdoor-telecom-cabinet-spd\/\r\n-->\r\n\r\n<style>\r\n  .ly-tc,\r\n  .ly-tc * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .ly-tc {\r\n    --ly-blue: #004898;\r\n    --ly-blue-dark: #00366f;\r\n    --ly-blue-light: #eaf3fc;\r\n    --ly-blue-pale: #f4f8fd;\r\n    --ly-green: #16865b;\r\n    --ly-green-light: #edf8f3;\r\n    --ly-orange: #d96e20;\r\n    --ly-orange-light: #fff4e9;\r\n    --ly-ink: #172235;\r\n    --ly-body: #3f4a5d;\r\n    --ly-muted: #687386;\r\n    --ly-line: #dce4ed;\r\n    --ly-line-dark: #c7d3df;\r\n    --ly-white: #ffffff;\r\n    --ly-bg: #f7f9fb;\r\n    --ly-shadow: 0 14px 38px rgba(18, 49, 83, 0.08);\r\n    --ly-shadow-soft: 0 8px 24px rgba(18, 49, 83, 0.055);\r\n\r\n    width: 100%;\r\n    margin: 0;\r\n    overflow: hidden;\r\n    color: var(--ly-body);\r\n    background: var(--ly-white);\r\n    font-family:\r\n      Inter,\r\n      -apple-system,\r\n      BlinkMacSystemFont,\r\n      \"Segoe UI\",\r\n      Arial,\r\n      Helvetica,\r\n      sans-serif;\r\n    font-size: 17px;\r\n    line-height: 1.72;\r\n    -webkit-font-smoothing: antialiased;\r\n    text-rendering: optimizeLegibility;\r\n  }\r\n\r\n  .ly-tc img,\r\n  .ly-tc svg {\r\n    display: block;\r\n    max-width: 100%;\r\n  }\r\n\r\n  .ly-tc a {\r\n    color: var(--ly-blue);\r\n    text-decoration: none;\r\n  }\r\n\r\n  .ly-tc a:hover,\r\n  .ly-tc a:focus {\r\n    text-decoration: underline;\r\n  }\r\n\r\n  .ly-tc p {\r\n    margin: 0 0 18px;\r\n  }\r\n\r\n  .ly-tc p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-tc h2,\r\n  .ly-tc h3,\r\n  .ly-tc h4 {\r\n    margin: 0;\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n    line-height: 1.23;\r\n    letter-spacing: -0.022em;\r\n  }\r\n\r\n  .ly-tc h2 {\r\n    margin-bottom: 19px;\r\n    font-size: clamp(29px, 3vw, 40px);\r\n  }\r\n\r\n  .ly-tc h3 {\r\n    margin-bottom: 10px;\r\n    font-size: clamp(20px, 2vw, 25px);\r\n  }\r\n\r\n  .ly-tc h4 {\r\n    margin-bottom: 8px;\r\n    font-size: 18px;\r\n  }\r\n\r\n  .ly-tc ul,\r\n  .ly-tc ol {\r\n    margin: 0;\r\n    padding-left: 22px;\r\n  }\r\n\r\n  .ly-tc li + li {\r\n    margin-top: 8px;\r\n  }\r\n\r\n  .ly-tc strong {\r\n    color: var(--ly-ink);\r\n  }\r\n\r\n  .ly-tc [id] {\r\n    scroll-margin-top: 90px;\r\n  }\r\n\r\n  .ly-tc-container {\r\n    width: min(1080px, calc(100% - 48px));\r\n    margin-right: auto;\r\n    margin-left: auto;\r\n  }\r\n\r\n  .ly-tc-prose {\r\n    max-width: 840px;\r\n  }\r\n\r\n  .ly-tc-section {\r\n    padding: 78px 0;\r\n  }\r\n\r\n  .ly-tc-section--soft {\r\n    background: var(--ly-bg);\r\n  }\r\n\r\n  .ly-tc-section--pale {\r\n    background: var(--ly-blue-pale);\r\n  }\r\n\r\n  .ly-tc-eyebrow {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    gap: 9px;\r\n    margin-bottom: 14px;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 850;\r\n    letter-spacing: 0.12em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-tc-eyebrow::before {\r\n    width: 26px;\r\n    height: 3px;\r\n    border-radius: 100px;\r\n    background: currentColor;\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-tc-lead {\r\n    max-width: 830px;\r\n    color: var(--ly-muted);\r\n    font-size: 18.5px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .ly-tc-grid {\r\n    display: grid;\r\n    gap: 20px;\r\n  }\r\n\r\n  .ly-tc-grid--2 {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  }\r\n\r\n  .ly-tc-grid--3 {\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  }\r\n\r\n  .ly-tc-grid--4 {\r\n    grid-template-columns: repeat(4, minmax(0, 1fr));\r\n  }\r\n\r\n  .ly-tc-card {\r\n    height: 100%;\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow-soft);\r\n  }\r\n\r\n  .ly-tc-card--blue {\r\n    border-top: 4px solid var(--ly-blue);\r\n  }\r\n\r\n  .ly-tc-card--green {\r\n    border-top: 4px solid var(--ly-green);\r\n  }\r\n\r\n  .ly-tc-card--orange {\r\n    border-top: 4px solid var(--ly-orange);\r\n  }\r\n\r\n  .ly-tc-card p,\r\n  .ly-tc-card li {\r\n    font-size: 15px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  .ly-tc-note,\r\n  .ly-tc-warning,\r\n  .ly-tc-success {\r\n    margin-top: 22px;\r\n    padding: 17px 19px;\r\n    border-radius: 8px;\r\n    font-size: 15.5px;\r\n    line-height: 1.62;\r\n  }\r\n\r\n  .ly-tc-note {\r\n    border-left: 4px solid var(--ly-blue);\r\n    color: #2d5277;\r\n    background: var(--ly-blue-light);\r\n  }\r\n\r\n  .ly-tc-warning {\r\n    border-left: 4px solid var(--ly-orange);\r\n    color: #6a4223;\r\n    background: var(--ly-orange-light);\r\n  }\r\n\r\n  .ly-tc-success {\r\n    border-left: 4px solid var(--ly-green);\r\n    color: #285b46;\r\n    background: var(--ly-green-light);\r\n  }\r\n\r\n  .ly-tc-note strong,\r\n  .ly-tc-warning strong,\r\n  .ly-tc-success strong {\r\n    color: inherit;\r\n  }\r\n\r\n  .ly-tc-cite {\r\n    display: inline;\r\n    margin-left: 2px;\r\n    font-size: 0.7em;\r\n    font-weight: 850;\r\n    line-height: 1;\r\n    vertical-align: super;\r\n  }\r\n\r\n  \/* OPENING *\/\r\n  .ly-tc-opening {\r\n    padding: 20px 0 42px;\r\n  }\r\n\r\n  .ly-tc-quick-answer {\r\n    max-width: 900px;\r\n    padding: 22px 24px;\r\n    border: 1px solid #bfd5eb;\r\n    border-radius: 12px;\r\n    background: linear-gradient(145deg, #f8fbff, #edf5fd);\r\n  }\r\n\r\n  .ly-tc-quick-answer__label {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    font-weight: 900;\r\n    letter-spacing: 0.05em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-tc-quick-answer p {\r\n    color: var(--ly-body);\r\n    font-size: 17px;\r\n    line-height: 1.65;\r\n  }\r\n\r\n  \/* BUTTONS *\/\r\n  .ly-tc-actions {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 12px;\r\n    margin-top: 23px;\r\n  }\r\n\r\n  .ly-tc-btn,\r\n  .ly-tc a.ly-tc-btn {\r\n    display: inline-flex;\r\n    min-height: 50px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    padding: 0 23px;\r\n    border: 1px solid var(--ly-blue);\r\n    border-radius: 7px;\r\n    color: #ffffff !important;\r\n    background: var(--ly-blue);\r\n    box-shadow: 0 10px 24px rgba(0, 72, 152, 0.2);\r\n    font-size: 14px;\r\n    font-weight: 850;\r\n    line-height: 1;\r\n    text-align: center;\r\n    text-decoration: none !important;\r\n    cursor: pointer;\r\n    transition:\r\n      transform 0.2s ease,\r\n      box-shadow 0.2s ease,\r\n      background-color 0.2s ease;\r\n  }\r\n\r\n  .ly-tc-btn:hover,\r\n  .ly-tc-btn:focus,\r\n  .ly-tc a.ly-tc-btn:hover,\r\n  .ly-tc a.ly-tc-btn:focus {\r\n    color: #ffffff !important;\r\n    border-color: var(--ly-blue-dark);\r\n    background: var(--ly-blue-dark);\r\n    box-shadow: 0 13px 28px rgba(0, 54, 111, 0.24);\r\n    text-decoration: none !important;\r\n    transform: translateY(-2px);\r\n  }\r\n\r\n  .ly-tc-btn span,\r\n  .ly-tc-btn:hover span,\r\n  .ly-tc-btn:focus span,\r\n  .ly-tc .leeyee-site-popup-btn span,\r\n  .ly-tc .leeyee-site-popup-btn:hover span,\r\n  .ly-tc .leeyee-site-popup-btn:focus span {\r\n    display: inline-block !important;\r\n    color: #ffffff !important;\r\n    opacity: 1 !important;\r\n    visibility: visible !important;\r\n    -webkit-text-fill-color: #ffffff !important;\r\n  }\r\n\r\n  \/* TABLE OF CONTENTS *\/\r\n  .ly-tc-toc {\r\n    padding: 33px 0;\r\n    border-top: 1px solid var(--ly-line);\r\n    border-bottom: 1px solid var(--ly-line);\r\n    background: var(--ly-bg);\r\n  }\r\n\r\n  .ly-tc-toc__box {\r\n    padding: 22px 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 11px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-toc__title {\r\n    margin-bottom: 14px;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n    font-weight: 850;\r\n  }\r\n\r\n  .ly-tc-toc__links {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 9px 22px;\r\n  }\r\n\r\n  .ly-tc-toc__links a {\r\n    position: relative;\r\n    padding-left: 15px;\r\n    color: var(--ly-body);\r\n    font-size: 14px;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .ly-tc-toc__links a::before {\r\n    position: absolute;\r\n    top: 8px;\r\n    left: 0;\r\n    width: 6px;\r\n    height: 6px;\r\n    border-radius: 50%;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-tc-toc__links a:hover {\r\n    color: var(--ly-blue);\r\n  }\r\n\r\n  \/* PROTECTION OVERVIEW *\/\r\n  .ly-tc-protection-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(5, minmax(0, 1fr));\r\n    gap: 13px;\r\n    margin-top: 33px;\r\n  }\r\n\r\n  .ly-tc-protection {\r\n    padding: 18px 16px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-protection__label {\r\n    display: inline-flex;\r\n    margin-bottom: 10px;\r\n    padding: 5px 8px;\r\n    border-radius: 5px;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-protection:nth-child(2) .ly-tc-protection__label {\r\n    background: var(--ly-green);\r\n  }\r\n\r\n  .ly-tc-protection:nth-child(3) .ly-tc-protection__label {\r\n    background: var(--ly-orange);\r\n  }\r\n\r\n  .ly-tc-protection:nth-child(4) .ly-tc-protection__label {\r\n    background: #7159c8;\r\n  }\r\n\r\n  .ly-tc-protection:nth-child(5) .ly-tc-protection__label {\r\n    background: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-tc-protection h3 {\r\n    margin-bottom: 7px;\r\n    font-size: 18px;\r\n  }\r\n\r\n  .ly-tc-protection p {\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.52;\r\n  }\r\n\r\n  \/* FIGURES *\/\r\n  .ly-tc-figure {\r\n    max-width: 1000px;\r\n    margin: 37px auto 0;\r\n  }\r\n\r\n  .ly-tc-figure__frame {\r\n    overflow: hidden;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow);\r\n  }\r\n\r\n  .ly-tc-figure__frame img {\r\n    width: 100%;\r\n    height: auto;\r\n    object-fit: contain;\r\n  }\r\n\r\n  .ly-tc-figure figcaption {\r\n    max-width: 900px;\r\n    margin: 13px auto 0;\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.55;\r\n    text-align: center;\r\n  }\r\n\r\n  \/* TABLES *\/\r\n  .ly-tc-table-shell {\r\n    width: 100%;\r\n    max-height: 70vh;\r\n    margin-top: 32px;\r\n    overflow: auto;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow-soft);\r\n    scrollbar-width: thin;\r\n    -webkit-overflow-scrolling: touch;\r\n  }\r\n\r\n  .ly-tc-table {\r\n    width: 100%;\r\n    min-width: 900px;\r\n    border-collapse: collapse;\r\n  }\r\n\r\n  .ly-tc-table th,\r\n  .ly-tc-table td {\r\n    padding: 15px 16px;\r\n    border-right: 1px solid var(--ly-line);\r\n    border-bottom: 1px solid var(--ly-line);\r\n    vertical-align: top;\r\n    text-align: left;\r\n  }\r\n\r\n  .ly-tc-table th:last-child,\r\n  .ly-tc-table td:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .ly-tc-table tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .ly-tc-table thead th {\r\n    position: sticky;\r\n    top: 0;\r\n    z-index: 3;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue-dark);\r\n    font-size: 12.5px;\r\n    font-weight: 850;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .ly-tc-table tbody tr:nth-child(even) {\r\n    background: #f9fbfd;\r\n  }\r\n\r\n  .ly-tc-table tbody tr:hover {\r\n    background: #f1f6fb;\r\n  }\r\n\r\n  .ly-tc-table td {\r\n    color: var(--ly-body);\r\n    font-size: 14px;\r\n    line-height: 1.52;\r\n  }\r\n\r\n  .ly-tc-table td:first-child {\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n  }\r\n\r\n  \/* AC COMPACT PARAMETER SECTION *\/\r\n  .ly-tc-section-heading {\r\n    max-width: 870px;\r\n    margin-bottom: 28px;\r\n  }\r\n\r\n  .ly-tc-section-heading .ly-tc-lead {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-tc-param-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 14px;\r\n  }\r\n\r\n  .ly-tc-param-card {\r\n    display: grid;\r\n    grid-template-columns: 67px minmax(0, 1fr);\r\n    gap: 13px;\r\n    align-items: start;\r\n    min-height: 132px;\r\n    padding: 18px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-param-card > strong {\r\n    color: var(--ly-blue);\r\n    font-size: 15px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-param-card b {\r\n    display: block;\r\n    margin-bottom: 4px;\r\n    color: var(--ly-ink);\r\n    font-size: 14.5px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .ly-tc-param-card span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  \/* DECISION STEPS *\/\r\n  .ly-tc-steps {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 13px;\r\n    margin-top: 29px;\r\n  }\r\n\r\n  .ly-tc-step {\r\n    display: grid;\r\n    grid-template-columns: 41px minmax(0, 1fr);\r\n    gap: 14px;\r\n    align-items: start;\r\n    padding: 18px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-step__number {\r\n    display: flex;\r\n    width: 39px;\r\n    height: 39px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border-radius: 50%;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    font-size: 14px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-step__content strong {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: var(--ly-ink);\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-tc-step__content span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  \/* REMOTE ALARM *\/\r\n  .ly-tc-alarm {\r\n    display: grid;\r\n    grid-template-columns: minmax(210px, 0.85fr) 76px minmax(250px, 1.15fr);\r\n    gap: 16px;\r\n    align-items: center;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-alarm__unit {\r\n    padding: 23px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 11px;\r\n    background: var(--ly-white);\r\n    text-align: center;\r\n    box-shadow: var(--ly-shadow-soft);\r\n  }\r\n\r\n  .ly-tc-alarm__unit strong {\r\n    display: block;\r\n    margin-bottom: 6px;\r\n    font-size: 17px;\r\n  }\r\n\r\n  .ly-tc-alarm__unit span {\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n  }\r\n\r\n  .ly-tc-alarm__line {\r\n    position: relative;\r\n    height: 3px;\r\n    background: var(--ly-blue);\r\n  }\r\n\r\n  .ly-tc-alarm__line::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: -1px;\r\n    width: 11px;\r\n    height: 11px;\r\n    border-top: 3px solid var(--ly-blue);\r\n    border-right: 3px solid var(--ly-blue);\r\n    content: \"\";\r\n    transform: translateY(-50%) rotate(45deg);\r\n  }\r\n\r\n  \/* GROUNDING *\/\r\n  .ly-tc-grounding {\r\n    padding: 30px;\r\n    border: 1px solid #c9dced;\r\n    border-radius: 13px;\r\n    background: var(--ly-blue-pale);\r\n  }\r\n\r\n  .ly-tc-grounding-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 14px;\r\n    margin-top: 23px;\r\n  }\r\n\r\n  .ly-tc-grounding-item {\r\n    padding: 19px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-grounding-item h3 {\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-tc-grounding-item p {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n  }\r\n\r\n  \/* ENVIRONMENT *\/\r\n  .ly-tc-environment {\r\n    display: grid;\r\n    grid-template-columns: 1fr auto 1fr;\r\n    gap: 18px;\r\n    align-items: stretch;\r\n    margin-top: 30px;\r\n    margin-bottom: 40px;\r\n  }\r\n\r\n  .ly-tc-environment__side {\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-environment__vs {\r\n    display: flex;\r\n    width: 52px;\r\n    height: 52px;\r\n    align-items: center;\r\n    align-self: center;\r\n    justify-content: center;\r\n    border-radius: 50%;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  #environment .ly-tc-figure {\r\n    margin-top: 0 !important;\r\n  }\r\n\r\n  \/* PRODUCT MAPPING *\/\r\n  .ly-tc-product-map {\r\n    display: grid;\r\n    gap: 12px;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-product-row {\r\n    display: grid;\r\n    grid-template-columns: 145px minmax(0, 1fr) minmax(220px, 0.65fr);\r\n    gap: 17px;\r\n    align-items: start;\r\n    padding: 18px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-product-row__family {\r\n    color: var(--ly-blue);\r\n    font-size: 15px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-product-row__use,\r\n  .ly-tc-product-row__confirm {\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-tc-product-row__use strong,\r\n  .ly-tc-product-row__confirm strong {\r\n    display: block;\r\n    margin-bottom: 3px;\r\n    font-size: 13px;\r\n  }\r\n\r\n  \/* SUPPLIER EVIDENCE *\/\r\n  .ly-tc-evidence {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 16px;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-evidence__item {\r\n    padding: 21px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 11px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-evidence__item h3 {\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-tc-evidence__item p {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  \/* MAINTENANCE *\/\r\n  .ly-tc-maintenance-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 16px;\r\n    margin-top: 29px;\r\n  }\r\n\r\n  .ly-tc-maintenance-card {\r\n    display: grid;\r\n    grid-template-columns: 46px minmax(0, 1fr);\r\n    gap: 16px;\r\n    align-items: start;\r\n    min-height: 150px;\r\n    padding: 21px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 11px;\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow-soft);\r\n  }\r\n\r\n  .ly-tc-maintenance-card__number {\r\n    display: flex;\r\n    width: 42px;\r\n    height: 42px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border-radius: 9px;\r\n    color: #ffffff;\r\n    background: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-maintenance-card h3 {\r\n    margin-bottom: 7px;\r\n    font-size: 20px;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .ly-tc-maintenance-card p {\r\n    margin: 0;\r\n    color: var(--ly-muted);\r\n    font-size: 14.5px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-tc-related-line {\r\n    margin-top: 22px;\r\n    color: var(--ly-muted);\r\n    font-size: 14.5px;\r\n  }\r\n\r\n  \/* CHECKLIST *\/\r\n  .ly-tc-checklist {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 11px;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-checkitem {\r\n    display: grid;\r\n    grid-template-columns: 25px minmax(0, 1fr);\r\n    gap: 12px;\r\n    align-items: start;\r\n    padding: 16px 17px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 9px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-checkitem::before {\r\n    display: flex;\r\n    width: 24px;\r\n    height: 24px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border-radius: 50%;\r\n    color: var(--ly-white);\r\n    background: var(--ly-green);\r\n    content: \"\u2713\";\r\n    font-size: 12px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-tc-checkitem strong {\r\n    display: block;\r\n    margin-bottom: 3px;\r\n    font-size: 14.5px;\r\n  }\r\n\r\n  .ly-tc-checkitem span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.48;\r\n  }\r\n\r\n  \/* CTA *\/\r\n  .ly-tc-cta {\r\n    margin-top: 33px;\r\n    padding: 30px;\r\n    border: 1px solid #bfd5eb;\r\n    border-radius: 13px;\r\n    background: linear-gradient(145deg, #f8fbff, #edf5fd);\r\n  }\r\n\r\n  .ly-tc-cta__grid {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1fr) auto;\r\n    gap: 27px;\r\n    align-items: center;\r\n  }\r\n\r\n  .ly-tc-cta h2 {\r\n    margin-bottom: 9px;\r\n    font-size: clamp(26px, 2.7vw, 34px);\r\n  }\r\n\r\n  .ly-tc-cta p {\r\n    max-width: 750px;\r\n    color: var(--ly-muted);\r\n  }\r\n\r\n  \/* RELATED GUIDES *\/\r\n  .ly-tc-related {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 15px;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-related__item {\r\n    display: block;\r\n    height: 100%;\r\n    padding: 20px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    color: var(--ly-ink) !important;\r\n    background: var(--ly-white);\r\n    transition:\r\n      border-color 0.2s ease,\r\n      box-shadow 0.2s ease,\r\n      transform 0.2s ease;\r\n  }\r\n\r\n  .ly-tc-related__item:hover {\r\n    border-color: #a8c8e7;\r\n    box-shadow: var(--ly-shadow-soft);\r\n    text-decoration: none;\r\n    transform: translateY(-2px);\r\n  }\r\n\r\n  .ly-tc-related__item strong {\r\n    display: block;\r\n    margin-bottom: 6px;\r\n    color: var(--ly-blue);\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-tc-related__item span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  \/* FAQ *\/\r\n  .ly-tc-faq {\r\n    display: grid;\r\n    gap: 11px;\r\n    max-width: 880px;\r\n    margin-top: 30px;\r\n  }\r\n\r\n  .ly-tc-faq details {\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-tc-faq summary {\r\n    position: relative;\r\n    padding: 18px 55px 18px 20px;\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n    cursor: pointer;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-tc-faq summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .ly-tc-faq summary::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: 20px;\r\n    color: var(--ly-blue);\r\n    content: \"+\";\r\n    font-size: 24px;\r\n    font-weight: 500;\r\n    transform: translateY(-50%);\r\n  }\r\n\r\n  .ly-tc-faq details[open] summary::after {\r\n    content: \"\u2212\";\r\n  }\r\n\r\n  .ly-tc-faq__body {\r\n    padding: 0 20px 20px;\r\n    color: var(--ly-muted);\r\n  }\r\n\r\n  \/* REFERENCES *\/\r\n  .ly-tc-references {\r\n    font-size: 14px;\r\n  }\r\n\r\n  .ly-tc-references li {\r\n    color: var(--ly-muted);\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .ly-tc-references a {\r\n    font-weight: 750;\r\n  }\r\n\r\n  .ly-tc-disclaimer {\r\n    margin-top: 28px;\r\n    padding-top: 21px;\r\n    border-top: 1px solid var(--ly-line);\r\n    color: #747e8e;\r\n    font-size: 13px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  \/* 1440 *\/\r\n  @media (max-width: 1440px) {\r\n    .ly-tc-container {\r\n      width: min(1060px, calc(100% - 50px));\r\n    }\r\n  }\r\n\r\n  \/* 1366 *\/\r\n  @media (max-width: 1366px) {\r\n    .ly-tc-container {\r\n      width: min(1030px, calc(100% - 46px));\r\n    }\r\n\r\n    .ly-tc-section {\r\n      padding: 74px 0;\r\n    }\r\n  }\r\n\r\n  \/* 1280 *\/\r\n  @media (max-width: 1280px) {\r\n    .ly-tc-container {\r\n      width: min(1000px, calc(100% - 42px));\r\n    }\r\n\r\n    .ly-tc-protection-grid {\r\n      grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-tc-grid--4 {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n  }\r\n\r\n  \/* 1024 *\/\r\n  @media (max-width: 1024px) {\r\n    .ly-tc-container {\r\n      width: min(940px, calc(100% - 36px));\r\n    }\r\n\r\n    .ly-tc-section {\r\n      padding: 68px 0;\r\n    }\r\n\r\n    .ly-tc-toc__links {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-tc-related,\r\n    .ly-tc-evidence {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-tc-table {\r\n      min-width: 820px;\r\n    }\r\n  }\r\n\r\n  \/* 912 *\/\r\n  @media (max-width: 912px) {\r\n    .ly-tc-container {\r\n      width: min(850px, calc(100% - 32px));\r\n    }\r\n\r\n    .ly-tc-param-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-tc-product-row {\r\n      grid-template-columns: 130px minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-tc-product-row__confirm {\r\n      grid-column: 2;\r\n    }\r\n\r\n    .ly-tc-cta__grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  \/* 820 *\/\r\n  @media (max-width: 820px) {\r\n    .ly-tc-section {\r\n      padding: 62px 0;\r\n    }\r\n\r\n    .ly-tc-grid--2,\r\n    .ly-tc-grid--3,\r\n    .ly-tc-related,\r\n    .ly-tc-evidence {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-protection-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-tc-alarm {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-alarm__line {\r\n      width: 3px;\r\n      height: 48px;\r\n      margin: 0 auto;\r\n    }\r\n\r\n    .ly-tc-alarm__line::after {\r\n      top: auto;\r\n      right: 50%;\r\n      bottom: -1px;\r\n      transform: translateX(50%) rotate(135deg);\r\n    }\r\n\r\n    .ly-tc-environment {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-environment__vs {\r\n      margin: 0 auto;\r\n    }\r\n  }\r\n\r\n  \/* 768 *\/\r\n  @media (max-width: 768px) {\r\n    .ly-tc {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-tc-container {\r\n      width: min(100% - 28px, 720px);\r\n    }\r\n\r\n    .ly-tc-opening {\r\n      padding-top: 12px;\r\n    }\r\n\r\n    .ly-tc-section {\r\n      padding: 57px 0;\r\n    }\r\n\r\n    .ly-tc-toc__links {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-checklist,\r\n    .ly-tc-grounding-grid,\r\n    .ly-tc-maintenance-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-maintenance-card {\r\n      min-height: 0;\r\n    }\r\n\r\n    #environment .ly-tc-environment {\r\n      margin-bottom: 30px;\r\n    }\r\n\r\n    .ly-tc-table-shell {\r\n      max-height: none;\r\n      overflow: visible;\r\n      border: 0;\r\n      border-radius: 0;\r\n      background: transparent;\r\n      box-shadow: none;\r\n    }\r\n\r\n    .ly-tc-table {\r\n      display: block;\r\n      min-width: 0;\r\n    }\r\n\r\n    .ly-tc-table thead {\r\n      display: none;\r\n    }\r\n\r\n    .ly-tc-table tbody,\r\n    .ly-tc-table tr,\r\n    .ly-tc-table td {\r\n      display: block;\r\n      width: 100%;\r\n    }\r\n\r\n    .ly-tc-table tbody {\r\n      display: grid;\r\n      gap: 13px;\r\n    }\r\n\r\n    .ly-tc-table tr,\r\n    .ly-tc-table tbody tr:nth-child(even),\r\n    .ly-tc-table tbody tr:hover {\r\n      overflow: hidden;\r\n      border: 1px solid var(--ly-line);\r\n      border-radius: 11px;\r\n      background: var(--ly-white);\r\n      box-shadow: var(--ly-shadow-soft);\r\n    }\r\n\r\n    .ly-tc-table td {\r\n      display: grid;\r\n      grid-template-columns: minmax(110px, 0.4fr) minmax(0, 0.6fr);\r\n      gap: 13px;\r\n      padding: 12px 14px;\r\n      border-right: 0;\r\n      border-bottom: 1px solid var(--ly-line);\r\n      font-size: 13.5px;\r\n    }\r\n\r\n    .ly-tc-table td::before {\r\n      color: var(--ly-blue-dark);\r\n      content: attr(data-label);\r\n      font-size: 11.5px;\r\n      font-weight: 850;\r\n      line-height: 1.4;\r\n      text-transform: uppercase;\r\n    }\r\n\r\n    .ly-tc-table td:last-child {\r\n      border-bottom: 0;\r\n    }\r\n\r\n    .ly-tc-figure figcaption {\r\n      text-align: left;\r\n    }\r\n  }\r\n\r\n  \/* 600 *\/\r\n  @media (max-width: 600px) {\r\n    .ly-tc-container {\r\n      width: min(100% - 24px, 570px);\r\n    }\r\n\r\n    .ly-tc-actions {\r\n      align-items: stretch;\r\n      flex-direction: column;\r\n    }\r\n\r\n    .ly-tc-btn,\r\n    .ly-tc a.ly-tc-btn {\r\n      width: 100%;\r\n      min-height: 50px;\r\n    }\r\n\r\n    .ly-tc-protection-grid,\r\n    .ly-tc-param-grid,\r\n    .ly-tc-steps {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-param-card {\r\n      min-height: 0;\r\n    }\r\n\r\n    .ly-tc-product-row {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-tc-product-row__confirm {\r\n      grid-column: auto;\r\n    }\r\n\r\n    .ly-tc-quick-answer,\r\n    .ly-tc-cta,\r\n    .ly-tc-grounding {\r\n      padding: 22px;\r\n    }\r\n  }\r\n\r\n  \/* 540 *\/\r\n  @media (max-width: 540px) {\r\n    .ly-tc h2 {\r\n      font-size: 31px;\r\n    }\r\n\r\n    .ly-tc h3 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-tc-lead {\r\n      font-size: 17px;\r\n    }\r\n\r\n    .ly-tc-table td {\r\n      grid-template-columns: 1fr;\r\n      gap: 4px;\r\n    }\r\n  }\r\n\r\n  \/* 480 *\/\r\n  @media (max-width: 480px) {\r\n    .ly-tc-container {\r\n      width: min(100% - 22px, 456px);\r\n    }\r\n\r\n    .ly-tc-section {\r\n      padding: 52px 0;\r\n    }\r\n\r\n    .ly-tc-card,\r\n    .ly-tc-toc__box,\r\n    .ly-tc-environment__side {\r\n      padding: 19px;\r\n    }\r\n\r\n    #environment .ly-tc-environment {\r\n      margin-bottom: 24px;\r\n    }\r\n\r\n    .ly-tc-figure__frame {\r\n      border-radius: 10px;\r\n    }\r\n  }\r\n\r\n  \/* 430 *\/\r\n  @media (max-width: 430px) {\r\n    .ly-tc-container {\r\n      width: min(100% - 20px, 410px);\r\n    }\r\n\r\n    .ly-tc-maintenance-card {\r\n      grid-template-columns: 1fr;\r\n      gap: 11px;\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-tc-param-card {\r\n      grid-template-columns: 1fr;\r\n      gap: 5px;\r\n      padding: 16px;\r\n    }\r\n  }\r\n\r\n  \/* 414 *\/\r\n  @media (max-width: 414px) {\r\n    .ly-tc h2 {\r\n      font-size: 29px;\r\n    }\r\n\r\n    .ly-tc-note,\r\n    .ly-tc-warning,\r\n    .ly-tc-success {\r\n      padding: 15px;\r\n    }\r\n  }\r\n\r\n  \/* 390 *\/\r\n  @media (max-width: 390px) {\r\n    .ly-tc-container {\r\n      width: min(100% - 18px, 372px);\r\n    }\r\n\r\n    .ly-tc-quick-answer,\r\n    .ly-tc-cta,\r\n    .ly-tc-grounding {\r\n      padding: 19px;\r\n    }\r\n  }\r\n\r\n  \/* 375 *\/\r\n  @media (max-width: 375px) {\r\n    .ly-tc h2 {\r\n      font-size: 28px;\r\n    }\r\n\r\n    .ly-tc-card {\r\n      padding: 18px;\r\n    }\r\n  }\r\n\r\n  \/* 360 *\/\r\n  @media (max-width: 360px) {\r\n    .ly-tc-container {\r\n      width: min(100% - 16px, 344px);\r\n    }\r\n\r\n    .ly-tc-checkitem {\r\n      grid-template-columns: 23px minmax(0, 1fr);\r\n      gap: 9px;\r\n    }\r\n  }\r\n\r\n  \/* 320 *\/\r\n  @media (max-width: 320px) {\r\n    .ly-tc-container {\r\n      width: calc(100% - 14px);\r\n    }\r\n\r\n    .ly-tc {\r\n      font-size: 15px;\r\n    }\r\n\r\n    .ly-tc h2 {\r\n      font-size: 26px;\r\n    }\r\n\r\n    .ly-tc-btn,\r\n    .ly-tc a.ly-tc-btn {\r\n      padding-right: 15px;\r\n      padding-left: 15px;\r\n      font-size: 13px;\r\n    }\r\n  }\r\n\r\n  @media (prefers-reduced-motion: reduce) {\r\n    .ly-tc *,\r\n    .ly-tc *::before,\r\n    .ly-tc *::after {\r\n      scroll-behavior: auto !important;\r\n      transition: none !important;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article class=\"ly-tc\">\r\n  <!-- QUICK ANSWER -->\r\n  <section class=\"ly-tc-opening\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-quick-answer\">\r\n        <span class=\"ly-tc-quick-answer__label\">Quick Answer<\/span>\r\n\r\n        <p>\r\n          An outdoor telecom cabinet normally requires more than one SPD.\r\n          Protect each conductive AC, DC, Ethernet and signal line according\r\n          to its actual voltage, interface, installation position and\r\n          grounding arrangement.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-actions\">\r\n        <a\r\n          class=\"ly-tc-btn leeyee-site-popup-btn\"\r\n          href=\"javascript:void(0);\"\r\n        >\r\n          <span>Request Cabinet SPD Selection<\/span>\r\n        <\/a>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- TABLE OF CONTENTS -->\r\n  <nav class=\"ly-tc-toc\" aria-label=\"Article contents\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-toc__box\">\r\n        <div class=\"ly-tc-toc__title\">In this guide<\/div>\r\n\r\n        <div class=\"ly-tc-toc__links\">\r\n          <a href=\"#protection-required\">Protection required<\/a>\r\n          <a href=\"#architecture\">Cabinet architecture<\/a>\r\n          <a href=\"#selection-matrix\">Selection matrix<\/a>\r\n          <a href=\"#ac-input\">AC input SPD<\/a>\r\n          <a href=\"#dc-power\">48V \/ \u221248V DC SPD<\/a>\r\n          <a href=\"#rj45-poe\">RJ45 and PoE<\/a>\r\n          <a href=\"#signal-lines\">Signal lines<\/a>\r\n          <a href=\"#remote-alarm\">Remote alarm<\/a>\r\n          <a href=\"#grounding\">Grounding and bonding<\/a>\r\n          <a href=\"#environment\">IP and condensation<\/a>\r\n          <a href=\"#product-mapping\">LEEYEE product mapping<\/a>\r\n          <a href=\"#maintenance\">Maintenance<\/a>\r\n          <a href=\"#procurement-checklist\">Procurement checklist<\/a>\r\n          <a href=\"#related-guides\">Related guides<\/a>\r\n          <a href=\"#references\">References<\/a>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/nav>\r\n\r\n  <!-- PROTECTION REQUIRED -->\r\n  <section class=\"ly-tc-section\" id=\"protection-required\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Start With the Cabinet Interfaces<\/div>\r\n\r\n        <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#what-surge-protection-does-an-outdoor-telecom-cabinet-need\" >What surge protection does an outdoor telecom cabinet need?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#outdoor-telecom-cabinet-surge-protection-architecture\" >Outdoor telecom cabinet surge protection architecture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#outdoor-telecom-cabinet-spd-selection-matrix\" >Outdoor telecom cabinet SPD selection matrix<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#ac-input-spd-selection\" >AC input SPD selection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#48v-%e2%88%9248v-dc-spd-selection\" >48V \/ \u221248V DC SPD selection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#rj45-and-poe-surge-protection\" >RJ45 and PoE surge protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#rs485-sensor-and-monitoring-line-protection\" >RS485, sensor and monitoring line protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#remote-alarm-contact-for-spd-status\" >Remote alarm contact for SPD status<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#grounding-and-bonding-affect-the-protection-achieved\" >Grounding and bonding affect the protection achieved<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#ip-rating-and-condensation-are-different-questions\" >IP rating and condensation are different questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#typical-leeyee-product-families-for-telecom-cabinets\" >Typical LEEYEE product families for telecom cabinets<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#what-buyers-should-verify-beyond-the-datasheet\" >What buyers should verify beyond the datasheet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#spd-maintenance-and-module-replacement\" >SPD Maintenance and Module Replacement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#information-to-send-before-requesting-a-quotation\" >Information to send before requesting a quotation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#need-an-initial-spd-recommendation\" >Need an initial SPD recommendation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#support-for-telecom-cabinet-oem-and-project-supply\" >Support for telecom cabinet OEM and project supply<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#continue-with-the-detailed-interface-guides\" >Continue with the detailed interface guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#outdoor-telecom-cabinet-spd-faq\" >Outdoor telecom cabinet SPD FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/#standards-and-technical-reference-framework\" >Standards and technical reference framework<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-surge-protection-does-an-outdoor-telecom-cabinet-need\"><\/span>What surge protection does an outdoor telecom cabinet need?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          Start by identifying every conductive cable entering or leaving the\r\n          enclosure. Do not start by selecting one general-purpose SPD.\r\n        <\/p>\r\n\r\n        <p>\r\n          AC power, low-voltage DC power and telecommunications or signalling\r\n          circuits are covered by different SPD requirements and test\r\n          frameworks.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n        <\/p>\r\n\r\n        <div class=\"ly-tc-warning\">\r\n          <strong>Do not substitute between circuits.<\/strong>\r\n          An AC SPD is not a 48V DC SPD. A DC power SPD is not automatically\r\n          suitable for an RJ45, PoE, RS485 or sensor line.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-protection-grid\">\r\n        <article class=\"ly-tc-protection\">\r\n          <span class=\"ly-tc-protection__label\">AC SPD<\/span>\r\n          <h3>AC input<\/h3>\r\n          <p>\r\n            Protects the utility supply, AC distribution and rectifier input.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-protection\">\r\n          <span class=\"ly-tc-protection__label\">DC SPD<\/span>\r\n          <h3>48V \/ \u221248V DC<\/h3>\r\n          <p>\r\n            Protects the rectifier output, battery bus and DC distribution.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-protection\">\r\n          <span class=\"ly-tc-protection__label\">RJ45 \/ PoE<\/span>\r\n          <h3>Ethernet<\/h3>\r\n          <p>\r\n            Protects copper data lines while supporting the required speed\r\n            and PoE arrangement.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-protection\">\r\n          <span class=\"ly-tc-protection__label\">SIGNAL<\/span>\r\n          <h3>RS485 and sensors<\/h3>\r\n          <p>\r\n            Protects monitoring, alarm, control and environmental sensor\r\n            circuits.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-protection\">\r\n          <span class=\"ly-tc-protection__label\">STATUS<\/span>\r\n          <h3>Remote alarm<\/h3>\r\n          <p>\r\n            Reports an SPD status change to the cabinet monitoring system.\r\n          <\/p>\r\n        <\/article>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- ARCHITECTURE -->\r\n  <section class=\"ly-tc-section ly-tc-section--soft\" id=\"architecture\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Whole-Cabinet Design<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"outdoor-telecom-cabinet-surge-protection-architecture\"><\/span>Outdoor telecom cabinet surge protection architecture<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          Review every conductive line crossing the cabinet boundary. Place\r\n          the relevant SPD close to the cable entry or distribution point.\r\n        <\/p>\r\n\r\n        <p>\r\n          The SPDs, cabinet enclosure and relevant cable shields should be\r\n          integrated into the project earthing and bonding design.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <figure class=\"ly-tc-figure\">\r\n        <div class=\"ly-tc-figure__frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/outdoor-telecom-cabinet-spd-protection-architecture.webp\"\r\n            alt=\"Outdoor telecom cabinet SPD protection architecture for AC input 48V DC RJ45 PoE and signal lines\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          Typical cabinet architecture showing separate AC, DC, RJ45 or PoE\r\n          and signal-line SPDs connected to the cabinet grounding system.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-tc-note\">\r\n        <strong>Page scope:<\/strong>\r\n        This guide covers protection installed in or directly associated with\r\n        the cabinet. Tower air terminals, antenna feeders and complete site\r\n        lightning protection require a wider project assessment.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- SELECTION MATRIX -->\r\n  <section class=\"ly-tc-section\" id=\"selection-matrix\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Fast Engineering Comparison<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"outdoor-telecom-cabinet-spd-selection-matrix\"><\/span>Outdoor telecom cabinet SPD selection matrix<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          Define the protected circuit before comparing supplier models.\r\n          Products that fit the same DIN rail may still serve completely\r\n          different applications.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-table-shell\">\r\n        <table class=\"ly-tc-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Cabinet interface<\/th>\r\n              <th>Typical SPD category<\/th>\r\n              <th>Equipment protected<\/th>\r\n              <th>Parameters to confirm<\/th>\r\n              <th>Common purchasing error<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">AC utility input<\/td>\r\n              <td data-label=\"SPD category\">\r\n                Type 1+2 or Type 2 AC SPD according to the project design\r\n              <\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                AC distribution, rectifier, fan, heater and auxiliary AC loads\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                Voltage, phases, earthing system, Uc, Iimp where required,\r\n                In, Imax, Up, poles and backup protection\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Selecting only from the nominal AC voltage\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">48V \/ \u221248V DC bus<\/td>\r\n              <td data-label=\"SPD category\">\r\n                Low-voltage DC SPD suitable for the actual telecom DC system\r\n              <\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                Rectifier output, battery bus, DC distribution and telecom\r\n                loads\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                Maximum continuous voltage, polarity, bonded conductor, Uc,\r\n                discharge ratings, Up and pole arrangement\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Selecting only from the nominal \u201c48V\u201d description\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">RJ45 Ethernet<\/td>\r\n              <td data-label=\"SPD category\">RJ45 data-line SPD<\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                Ethernet switch, router, gateway, camera, radio and controller\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                Data speed, cable category, shield, protected pairs, connector\r\n                arrangement and insertion loss\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Assuming every RJ45 SPD supports Gigabit Ethernet\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">PoE line<\/td>\r\n              <td data-label=\"SPD category\">\r\n                RJ45 SPD compatible with the required PoE arrangement\r\n              <\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                Outdoor camera, wireless access point and PoE-powered device\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                PoE method, power, powered pairs, current, speed and shielding\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Assuming every data SPD supports the required PoE power\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">\r\n                RS485, sensor or alarm\r\n              <\/td>\r\n              <td data-label=\"SPD category\">\r\n                Signal-line SPD matched to the interface\r\n              <\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                RTU, controller, sensor, door alarm and remote I\/O\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                Signal voltage, current, pair count, protocol, transmission\r\n                rate, shield and terminals\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Replacing a signal SPD with a DC power SPD\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td data-label=\"Cabinet interface\">SPD status output<\/td>\r\n              <td data-label=\"SPD category\">\r\n                SPD with potential-free remote contact\r\n              <\/td>\r\n              <td data-label=\"Equipment protected\">\r\n                NMS, PLC, RTU or cabinet alarm controller receives the signal\r\n              <\/td>\r\n              <td data-label=\"Parameters to confirm\">\r\n                COM, NO and NC logic, contact rating and normal\/failure state\r\n              <\/td>\r\n              <td data-label=\"Common error\">\r\n                Ordering a standard version without remote signalling\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <figure class=\"ly-tc-figure\">\r\n        <div class=\"ly-tc-figure__frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/outdoor-telecom-cabinet-ac-dc-rj45-signal-spd-selection.webp\"\r\n            alt=\"Comparison of AC DC RJ45 PoE and signal SPD selection for outdoor telecom cabinets\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          AC power, low-voltage DC power, Ethernet and signal lines require\r\n          separate selection criteria.\r\n        <\/figcaption>\r\n      <\/figure>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- AC INPUT -->\r\n  <section class=\"ly-tc-section ly-tc-section--pale\" id=\"ac-input\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-section-heading\">\r\n        <div class=\"ly-tc-eyebrow\">Protection Point 01<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"ac-input-spd-selection\"><\/span>AC input SPD selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          The AC SPD protects the incoming utility supply and the AC side of\r\n          the rectifier. Selection and coordination should follow the actual\r\n          AC system, installation position and project protection concept.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-8\">[8]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-param-grid\">\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>Type<\/strong>\r\n          <div>\r\n            <b>Type 1+2 or Type 2<\/b>\r\n            <span>\r\n              Confirm the classification from the project lightning\r\n              protection and coordination design.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>Uc<\/strong>\r\n          <div>\r\n            <b>Maximum continuous operating voltage<\/b>\r\n            <span>\r\n              Match Uc to the actual supply voltage, tolerance and earthing\r\n              arrangement.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>Iimp<\/strong>\r\n          <div>\r\n            <b>Lightning impulse current<\/b>\r\n            <span>\r\n              Confirm the required 10\/350 \u03bcs value where Type 1 capability is\r\n              specified.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>In \/ Imax<\/strong>\r\n          <div>\r\n            <b>Discharge current ratings<\/b>\r\n            <span>\r\n              Compare products using the same waveform and classification.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>Up<\/strong>\r\n          <div>\r\n            <b>Voltage protection level<\/b>\r\n            <span>\r\n              Coordinate Up with the withstand level of the rectifier and\r\n              downstream equipment.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-param-card\">\r\n          <strong>Poles<\/strong>\r\n          <div>\r\n            <b>Protection-mode arrangement<\/b>\r\n            <span>\r\n              Confirm 1P+N, 2P, 3P+N, 3+1, 4P or another required\r\n              configuration.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        <strong>Important:<\/strong>\r\n        The AC input SPD does not replace the DC, Ethernet or signal-line SPDs\r\n        installed downstream.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- DC POWER -->\r\n  <section class=\"ly-tc-section\" id=\"dc-power\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Protection Point 02<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"48v-%e2%88%9248v-dc-spd-selection\"><\/span>48V \/ \u221248V DC SPD selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          \u201c48V\u201d is a nominal system description. The real DC bus voltage may\r\n          be higher during rectifier operation and battery charging.\r\n        <\/p>\r\n\r\n        <p>\r\n          Select the SPD from the highest continuous DC voltage, polarity,\r\n          bonded conductor, protection modes and installation position.\r\n          IEC 61643-41:2025 provides the test framework for SPDs connected to\r\n          low-voltage DC circuits.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-grid ly-tc-grid--4\" style=\"margin-top: 30px\">\r\n        <article class=\"ly-tc-card ly-tc-card--blue\">\r\n          <h3>Confirm voltage<\/h3>\r\n          <p>\r\n            Provide nominal voltage, rectifier range, battery charging range\r\n            and the highest continuous voltage.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card ly-tc-card--green\">\r\n          <h3>Confirm polarity<\/h3>\r\n          <p>\r\n            Identify DC+, RTN, DC\u2212 or \u221248V, PE and the conductor bonded to the\r\n            cabinet earth.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card ly-tc-card--orange\">\r\n          <h3>Confirm location<\/h3>\r\n          <p>\r\n            State whether the SPD is at the incoming feeder, rectifier output,\r\n            battery bus or DC distribution unit.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card ly-tc-card--blue\">\r\n          <h3>Confirm maintenance<\/h3>\r\n          <p>\r\n            Specify visual indication, replaceable modules and remote\r\n            signalling where required.\r\n          <\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        <strong>Do not use a high-voltage PV SPD as an automatic substitute.<\/strong>\r\n        A photovoltaic circuit and a low-voltage telecom DC bus have different\r\n        system conditions and voltage ranges.\r\n      <\/div>\r\n\r\n      <p style=\"margin-top: 22px\">\r\n        Read the detailed\r\n        <a href=\"\/48v-dc-spd-for-telecom\/\">\r\n          48V \/ \u221248V DC SPD for telecom guide\r\n        <\/a>\r\n        for the complete voltage and protection-mode process.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- RJ45 AND POE -->\r\n  <section class=\"ly-tc-section ly-tc-section--soft\" id=\"rj45-poe\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Protection Point 03<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"rj45-and-poe-surge-protection\"><\/span>RJ45 and PoE surge protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          An RJ45 connector does not define the complete technical\r\n          requirement.\r\n        <\/p>\r\n\r\n        <p>\r\n          IEC 61643-21:2025 covers telecommunications and signalling network\r\n          SPDs, including networks carrying power on the same line, such as\r\n          Power over Ethernet.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-steps\">\r\n        <article class=\"ly-tc-step\">\r\n          <div class=\"ly-tc-step__number\">1<\/div>\r\n          <div class=\"ly-tc-step__content\">\r\n            <strong>What data speed is required?<\/strong>\r\n            <span>\r\n              Confirm 10\/100 Mbps, Gigabit Ethernet or another required\r\n              transmission rate.\r\n            <\/span>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-step\">\r\n          <div class=\"ly-tc-step__number\">2<\/div>\r\n          <div class=\"ly-tc-step__content\">\r\n            <strong>Does the cable carry PoE?<\/strong>\r\n            <span>\r\n              Confirm the PoE method, required power, operating current and\r\n              powered pairs.\r\n            <\/span>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-step\">\r\n          <div class=\"ly-tc-step__number\">3<\/div>\r\n          <div class=\"ly-tc-step__content\">\r\n            <strong>Is the cable shielded?<\/strong>\r\n            <span>\r\n              Confirm the shield termination and equipotential-bonding method.\r\n            <\/span>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-step\">\r\n          <div class=\"ly-tc-step__number\">4<\/div>\r\n          <div class=\"ly-tc-step__content\">\r\n            <strong>Where is the outdoor equipment?<\/strong>\r\n            <span>\r\n              Evaluate protection and bonding at both ends of the copper link.\r\n            <\/span>\r\n          <\/div>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        <strong>Not every RJ45 SPD supports every PoE system.<\/strong>\r\n        A device may physically fit while having unsuitable bandwidth,\r\n        current capacity, protected pairs or shielding.\r\n      <\/div>\r\n\r\n      <p style=\"margin-top: 22px\">\r\n        Continue with the\r\n        <a href=\"\/rj45-surge-protector-selection\/\">\r\n          RJ45 surge protector selection guide\r\n        <\/a>\r\n        and the\r\n        <a href=\"\/poe-surge-protector\/\">\r\n          PoE surge protection guide\r\n        <\/a>.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- SIGNAL LINES -->\r\n  <section class=\"ly-tc-section\" id=\"signal-lines\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Protection Point 04<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"rs485-sensor-and-monitoring-line-protection\"><\/span>RS485, sensor and monitoring line protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          Outdoor telecom cabinets often contain door alarms, environmental\r\n          sensors, battery monitoring and remote-control interfaces.\r\n        <\/p>\r\n\r\n        <p>\r\n          Select the signal SPD from the protocol, voltage, pair count,\r\n          current, transmission requirement and terminal arrangement.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-grid ly-tc-grid--3\" style=\"margin-top: 29px\">\r\n        <article class=\"ly-tc-card ly-tc-card--blue\">\r\n          <h3>RS485 communication<\/h3>\r\n          <p>\r\n            Confirm signal voltage, pair count, data rate, current and cable\r\n            shielding.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card ly-tc-card--orange\">\r\n          <h3>Door and alarm lines<\/h3>\r\n          <p>\r\n            Review door contacts, security wiring and any control conductor\r\n            extending outside the cabinet.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card ly-tc-card--green\">\r\n          <h3>Environmental sensors<\/h3>\r\n          <p>\r\n            Match the SPD to the sensor supply, output signal, conductor\r\n            number and grounding method.\r\n          <\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        A signal circuit and a power circuit can share the same nominal\r\n        voltage while requiring different SPD characteristics.\r\n      <\/div>\r\n\r\n      <p style=\"margin-top: 22px\">\r\n        See the\r\n        <a href=\"\/rs485-spd-guide\/\">\r\n          RS485 surge protector selection guide\r\n        <\/a>\r\n        for protocol-specific guidance.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- REMOTE ALARM -->\r\n  <section class=\"ly-tc-section ly-tc-section--soft\" id=\"remote-alarm\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Unattended Cabinet Monitoring<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"remote-alarm-contact-for-spd-status\"><\/span>Remote alarm contact for SPD status<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          A visual indicator requires a site visit. An optional\r\n          potential-free contact allows the monitoring system to receive an\r\n          SPD status change remotely.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-alarm\">\r\n        <div class=\"ly-tc-alarm__unit\">\r\n          <strong>SPD Remote Contact<\/strong>\r\n          <span>COM \/ NO \/ NC potential-free terminals<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-alarm__line\" aria-hidden=\"true\"><\/div>\r\n\r\n        <div class=\"ly-tc-alarm__unit\">\r\n          <strong>NMS, PLC, RTU or Alarm Controller<\/strong>\r\n          <span>Receives the status signal for maintenance reporting<\/span>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-grid ly-tc-grid--3\" style=\"margin-top: 28px\">\r\n        <article class=\"ly-tc-card\">\r\n          <h3>Define the logic<\/h3>\r\n          <p>\r\n            Confirm which contact state represents normal operation, module\r\n            removal or SPD failure.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card\">\r\n          <h3>Check the rating<\/h3>\r\n          <p>\r\n            Verify that the controller input voltage and current are within\r\n            the contact rating.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-card\">\r\n          <h3>Test commissioning<\/h3>\r\n          <p>\r\n            Verify the complete alarm path from the SPD to the remote\r\n            monitoring platform.\r\n          <\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <p style=\"margin-top: 22px\">\r\n        See the\r\n        <a href=\"\/spd-remote-alarm-plc\/\">\r\n          SPD remote alarm and PLC wiring guide\r\n        <\/a>.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- GROUNDING -->\r\n  <section class=\"ly-tc-section\" id=\"grounding\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-grounding\">\r\n        <div class=\"ly-tc-prose\">\r\n          <div class=\"ly-tc-eyebrow\">The Surge Discharge Path<\/div>\r\n\r\n          <h2><span class=\"ez-toc-section\" id=\"grounding-and-bonding-affect-the-protection-achieved\"><\/span>Grounding and bonding affect the protection achieved<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p class=\"ly-tc-lead\">\r\n            The internal cabinet grounding bar must be integrated into the\r\n            wider site earthing and bonding system.\r\n          <\/p>\r\n\r\n          <p>\r\n            ITU-T K.56 and K.112 provide telecommunications-sector guidance\r\n            related to lightning protection, earthing and bonding for radio\r\n            base station environments.\r\n            <sup class=\"ly-tc-cite\"><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n            <sup class=\"ly-tc-cite\"><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-grounding-grid\">\r\n          <article class=\"ly-tc-grounding-item\">\r\n            <h3>Use coordinated bonding<\/h3>\r\n            <p>\r\n              Integrate the SPDs, metal enclosure and relevant cable shields\r\n              into the project bonding design.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-tc-grounding-item\">\r\n            <h3>Keep paths short<\/h3>\r\n            <p>\r\n              Avoid long conductors, unnecessary loops and indirect routes\r\n              between the SPD and grounding bar.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-tc-grounding-item\">\r\n            <h3>Separate cable routes<\/h3>\r\n            <p>\r\n              Avoid routing incoming unprotected conductors beside protected\r\n              outgoing conductors.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-tc-grounding-item\">\r\n            <h3>Connect to site earth<\/h3>\r\n            <p>\r\n              An internal copper bar cannot replace a complete site earthing\r\n              system.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <p style=\"margin-top: 22px\">\r\n        Related resources:\r\n        <a href=\"\/spd-cable-length-0-5m\/\">\r\n          SPD connection cable length\r\n        <\/a>\r\n        and\r\n        <a href=\"\/spd-grounding-resistance\/\">\r\n          SPD grounding requirements\r\n        <\/a>.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- ENVIRONMENT -->\r\n  <section class=\"ly-tc-section ly-tc-section--soft\" id=\"environment\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Outdoor Cabinet Environment<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"ip-rating-and-condensation-are-different-questions\"><\/span>IP rating and condensation are different questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          An IP-rated enclosure can protect against defined dust and water\r\n          ingress conditions. It does not automatically solve internal\r\n          condensation.\r\n        <\/p>\r\n\r\n        <p>\r\n          IEC 60529 defines enclosure degrees of protection using the IP Code.\r\n          The classification does not define the complete internal\r\n          temperature, humidity or condensation-control strategy.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-7\">[7]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-environment\">\r\n        <div class=\"ly-tc-environment__side\">\r\n          <h3>External ingress control<\/h3>\r\n\r\n          <ul>\r\n            <li>Cabinet IP classification<\/li>\r\n            <li>Door seals and gaskets<\/li>\r\n            <li>Cable glands and entry plates<\/li>\r\n            <li>Rain hood and drainage design<\/li>\r\n            <li>Corrosion-resistant materials<\/li>\r\n            <li>UV, salt-air and pollution exposure<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-environment__vs\">AND<\/div>\r\n\r\n        <div class=\"ly-tc-environment__side\">\r\n          <h3>Internal climate control<\/h3>\r\n\r\n          <ul>\r\n            <li>Day and night temperature changes<\/li>\r\n            <li>Humidity and dew-point conditions<\/li>\r\n            <li>Heating or dehumidification<\/li>\r\n            <li>Ventilation or heat exchanger<\/li>\r\n            <li>Cold surfaces and thermal bridges<\/li>\r\n            <li>Moisture and corrosion inspection<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <figure class=\"ly-tc-figure\">\r\n        <div class=\"ly-tc-figure__frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/outdoor-telecom-cabinet-spd-environment-maintenance-checklist.webp\"\r\n            alt=\"Outdoor telecom cabinet SPD grounding condensation remote alarm and maintenance checklist\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          Cabinet reliability depends on enclosure sealing, condensation\r\n          control, grounding, status monitoring and maintenance access.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        <strong>Important:<\/strong>\r\n        An IP-rated cabinet does not automatically make every internal SPD\r\n        suitable for direct outdoor exposure. Confirm the environmental\r\n        limits for the selected product.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- PRODUCT MAPPING -->\r\n  <section class=\"ly-tc-section\" id=\"product-mapping\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">LEEYEE Preliminary Mapping<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"typical-leeyee-product-families-for-telecom-cabinets\"><\/span>Typical LEEYEE product families for telecom cabinets<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          This mapping helps buyers identify the likely product family. It is\r\n          not a universal model-substitution table.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-product-map\">\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">LY1-C40 Series<\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            Type 2 AC protection for selected distribution and rectifier-input\r\n            applications.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            Uc, poles, In, Imax, Up, earthing system and remote-contact option.\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">LY1-C401S1<\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            Compact 1P+N AC protection where this arrangement matches the\r\n            single-phase cabinet design.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            System voltage, earthing method, installation position and backup\r\n            protection.\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">LY1-12.5 Series<\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            AC Type 1+2 protection where the project requires declared\r\n            lightning-current capability.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            Iimp, Uc, poles, Up, upstream protection and installation\r\n            position.\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">\r\n            Low-Voltage DC Range\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            48V or \u221248V DC feeder, rectifier output, battery bus and DC\r\n            distribution protection.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            Highest continuous voltage, polarity, bonded conductor, poles and\r\n            remote signalling.\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">\r\n            RJ45 \/ PoE Range\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            Copper Ethernet, outdoor cameras, wireless equipment and\r\n            monitoring interfaces.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            Data speed, PoE method, power, protected pairs, shielding and\r\n            connectors.\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-product-row\">\r\n          <div class=\"ly-tc-product-row__family\">LY10 Signal SPD<\/div>\r\n\r\n          <div class=\"ly-tc-product-row__use\">\r\n            <strong>Typical use<\/strong>\r\n            RS485, sensors, control circuits and industrial communication\r\n            lines.\r\n          <\/div>\r\n\r\n          <div class=\"ly-tc-product-row__confirm\">\r\n            <strong>Confirm before ordering<\/strong>\r\n            Signal voltage, pair count, current, transmission requirement and\r\n            terminal layout.\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-note\">\r\n        <strong>Final model confirmation:<\/strong>\r\n        Send the cabinet diagram, system voltage, interfaces, grounding\r\n        arrangement and document requirements before approving the exact\r\n        model.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- SUPPLIER EVIDENCE -->\r\n  <section class=\"ly-tc-section ly-tc-section--pale\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Supplier Verification<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"what-buyers-should-verify-beyond-the-datasheet\"><\/span>What buyers should verify beyond the datasheet<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          A technically suitable SPD still needs product documentation,\r\n          manufacturing control and sample confirmation before bulk ordering.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-evidence\">\r\n        <article class=\"ly-tc-evidence__item\">\r\n          <h3>Component and product testing<\/h3>\r\n          <p>\r\n            LEEYEE testing capability includes MOV and GDT testing, impulse\r\n            equipment, thermal stability testing and combination-wave testing.\r\n            Applicable tests depend on the product category and test plan.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-evidence__item\">\r\n          <h3>Document-scope confirmation<\/h3>\r\n          <p>\r\n            Confirm that the datasheet, certificate or report applies to the\r\n            exact model, voltage, pole arrangement and declared ratings being\r\n            ordered.\r\n          <\/p>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-evidence__item\">\r\n          <h3>Sample approval<\/h3>\r\n          <p>\r\n            Verify terminal arrangement, DIN-rail space, remote contact,\r\n            labels and replacement modules before bulk production.\r\n          <\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-warning\">\r\n        One certificate or test photograph should not be assumed to cover\r\n        every AC, DC, RJ45, PoE or signal SPD.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- MAINTENANCE -->\r\n  <section class=\"ly-tc-section\" id=\"maintenance\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Lifecycle Planning<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"spd-maintenance-and-module-replacement\"><\/span>SPD Maintenance and Module Replacement<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          Plan routine inspections, remote alarm tests and compatible module\r\n          replacement without rebuilding the cabinet distribution section.\r\n        <\/p>\r\n\r\n        <p>\r\n          IEC 61643-22 addresses selection, location, coordination and\r\n          operational considerations for telecommunications and signalling\r\n          network SPDs.\r\n          <sup class=\"ly-tc-cite\"><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-maintenance-grid\">\r\n        <article class=\"ly-tc-maintenance-card\">\r\n          <div class=\"ly-tc-maintenance-card__number\">01<\/div>\r\n\r\n          <div>\r\n            <h3>Routine Inspection<\/h3>\r\n            <p>\r\n              Check status indicators, terminals, wiring, overheating,\r\n              contamination, moisture and corrosion.\r\n            <\/p>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-maintenance-card\">\r\n          <div class=\"ly-tc-maintenance-card__number\">02<\/div>\r\n\r\n          <div>\r\n            <h3>Remote Alarm Test<\/h3>\r\n            <p>\r\n              Verify that the monitoring system receives the intended normal\r\n              and failure states.\r\n            <\/p>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-maintenance-card\">\r\n          <div class=\"ly-tc-maintenance-card__number\">03<\/div>\r\n\r\n          <div>\r\n            <h3>Module Replacement<\/h3>\r\n            <p>\r\n              Use the compatible replacement cartridge specified for the\r\n              installed base, voltage and protection characteristics.\r\n            <\/p>\r\n          <\/div>\r\n        <\/article>\r\n\r\n        <article class=\"ly-tc-maintenance-card\">\r\n          <div class=\"ly-tc-maintenance-card__number\">04<\/div>\r\n\r\n          <div>\r\n            <h3>Post-Surge Check<\/h3>\r\n            <p>\r\n              Inspect the SPDs, terminals, grounding conductors and protected\r\n              equipment after a known severe surge event.\r\n            <\/p>\r\n          <\/div>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <p class=\"ly-tc-related-line\">\r\n        Related guides:\r\n        <a href=\"\/spd-maintenance-checklist\/\">\r\n          SPD maintenance checklist\r\n        <\/a>\r\n        and\r\n        <a href=\"\/pluggable-spd-replacement\/\">\r\n          pluggable SPD replacement guide\r\n        <\/a>.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- PROCUREMENT CHECKLIST -->\r\n  <section\r\n    class=\"ly-tc-section ly-tc-section--soft\"\r\n    id=\"procurement-checklist\"\r\n  >\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">For OEM and Project Buyers<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"information-to-send-before-requesting-a-quotation\"><\/span>Information to send before requesting a quotation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          These details allow the supplier to compare the same engineering\r\n          requirement and reduce model-selection errors.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-checklist\">\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Cabinet application<\/strong>\r\n            <span>\r\n              Telecom power, wireless site, CCTV, roadside network or another\r\n              outdoor communication application.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Electrical drawing<\/strong>\r\n            <span>\r\n              Show AC input, rectifier, battery, DC distribution, loads and\r\n              grounding points.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>AC input details<\/strong>\r\n            <span>\r\n              Voltage, phases, neutral, earthing system and SPD installation\r\n              position.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>48V \/ \u221248V DC range<\/strong>\r\n            <span>\r\n              Nominal voltage, maximum voltage, rectifier range, polarity and\r\n              bonded conductor.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Ethernet interfaces<\/strong>\r\n            <span>\r\n              Port quantity, speed, cable category, shielding and connected\r\n              equipment.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>PoE information<\/strong>\r\n            <span>\r\n              PoE method, required power, powered pairs and operating current.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Signal lines<\/strong>\r\n            <span>\r\n              RS485, sensors, door contacts, BMS, RTU and other external copper\r\n              circuits.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Remote alarm<\/strong>\r\n            <span>\r\n              COM, NO and NC logic, contact rating and controller input.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Grounding layout<\/strong>\r\n            <span>\r\n              Grounding-bar position, SPD connection route and site-earthing\r\n              interface.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Outdoor environment<\/strong>\r\n            <span>\r\n              IP rating, temperature, humidity, condensation control and\r\n              corrosion exposure.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Mechanical limits<\/strong>\r\n            <span>\r\n              DIN-rail width, terminal direction, cable space and service\r\n              access.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-checkitem\">\r\n          <div>\r\n            <strong>Commercial requirements<\/strong>\r\n            <span>\r\n              Quantity, target market, documents, OEM label, packaging and\r\n              spare modules.\r\n            <\/span>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-cta\">\r\n        <div class=\"ly-tc-cta__grid\">\r\n          <div>\r\n            <h2><span class=\"ez-toc-section\" id=\"need-an-initial-spd-recommendation\"><\/span>Need an initial SPD recommendation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n              Send the cabinet drawing, AC input, highest continuous DC\r\n              voltage, RJ45 or PoE requirements, signal-line list, grounding\r\n              layout and expected quantity.\r\n            <\/p>\r\n          <\/div>\r\n\r\n          <div>\r\n            <a\r\n              class=\"ly-tc-btn leeyee-site-popup-btn\"\r\n              href=\"javascript:void(0);\"\r\n            >\r\n              <span>Send Cabinet Parameters<\/span>\r\n            <\/a>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- LEEYEE -->\r\n  <section class=\"ly-tc-section\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-grid ly-tc-grid--2\">\r\n        <div>\r\n          <div class=\"ly-tc-eyebrow\">LEEYEE B2B Support<\/div>\r\n\r\n          <h2><span class=\"ez-toc-section\" id=\"support-for-telecom-cabinet-oem-and-project-supply\"><\/span>Support for telecom cabinet OEM and project supply<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p class=\"ly-tc-lead\">\r\n            LEEYEE is a specialized surge protection and low-voltage\r\n            protection supplier, trusted for solar PV, power distribution,\r\n            telecom, industrial and OEM applications.\r\n          <\/p>\r\n\r\n          <p>\r\n            CNSPD is LEEYEE\u2019s surge protection-focused brand platform, built\r\n            to help global buyers source reliable SPDs and related\r\n            low-voltage protection products.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>Built to Protect. Trusted to Last.<\/strong>\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-tc-card ly-tc-card--blue\">\r\n          <h3>Available B2B support<\/h3>\r\n\r\n          <ul>\r\n            <li>AC, DC and signal SPD parameter confirmation<\/li>\r\n            <li>Cabinet interface and DIN-rail space review<\/li>\r\n            <li>Remote alarm contact configuration<\/li>\r\n            <li>Datasheet and document-scope confirmation<\/li>\r\n            <li>OEM label and private-label discussion<\/li>\r\n            <li>Sample evaluation before bulk production<\/li>\r\n            <li>Replaceable-module and spare-parts planning<\/li>\r\n          <\/ul>\r\n\r\n          <div class=\"ly-tc-note\">\r\n            Final approval should be based on the actual cabinet drawing,\r\n            system parameters, applicable requirements and sample\r\n            verification.\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- RELATED GUIDES -->\r\n  <section\r\n    class=\"ly-tc-section ly-tc-section--soft\"\r\n    id=\"related-guides\"\r\n  >\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Related Technical Guides<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"continue-with-the-detailed-interface-guides\"><\/span>Continue with the detailed interface guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-tc-lead\">\r\n          This page is the whole-cabinet decision guide. The following pages\r\n          cover individual circuits in greater technical depth.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-related\">\r\n        <a class=\"ly-tc-related__item\" href=\"\/48v-dc-spd-for-telecom\/\">\r\n          <strong>48V \/ \u221248V DC Telecom SPD<\/strong>\r\n          <span>\r\n            Voltage range, polarity, bonding, protection modes and remote\r\n            alarm selection.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-tc-related__item\"\r\n          href=\"\/rj45-surge-protector-selection\/\"\r\n        >\r\n          <strong>RJ45 Surge Protector Selection<\/strong>\r\n          <span>\r\n            Data speed, cable pairs, shielding, connector layout and insertion\r\n            loss.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/poe-surge-protector\/\">\r\n          <strong>PoE Surge Protection<\/strong>\r\n          <span>\r\n            Protection for outdoor cameras, wireless equipment and\r\n            Ethernet-powered devices.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/rs485-spd-guide\/\">\r\n          <strong>RS485 SPD Selection<\/strong>\r\n          <span>\r\n            Signal voltage, conductor pairs, transmission requirements and\r\n            grounding.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/spd-remote-alarm-plc\/\">\r\n          <strong>SPD Remote Alarm Contact<\/strong>\r\n          <span>\r\n            COM, NO and NC status signals for PLC, RTU and remote monitoring.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/outdoor-spd-ip-rating\/\">\r\n          <strong>Outdoor SPD and IP Rating<\/strong>\r\n          <span>\r\n            Enclosure ingress protection and the environmental limits of\r\n            internal components.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/spd-cable-length-0-5m\/\">\r\n          <strong>SPD Connection Cable Length<\/strong>\r\n          <span>\r\n            Why conductor routing influences the voltage appearing at\r\n            protected equipment.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/spd-grounding-resistance\/\">\r\n          <strong>SPD Grounding Requirements<\/strong>\r\n          <span>\r\n            Cabinet grounding bars, bonding routes and connection to the site\r\n            earthing system.\r\n          <\/span>\r\n        <\/a>\r\n\r\n        <a class=\"ly-tc-related__item\" href=\"\/spd-maintenance-checklist\/\">\r\n          <strong>SPD Maintenance Checklist<\/strong>\r\n          <span>\r\n            Status indicators, alarms, terminals, modules, moisture and\r\n            post-event condition.\r\n          <\/span>\r\n        <\/a>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- FAQ -->\r\n  <section class=\"ly-tc-section\" id=\"faq\">\r\n    <div class=\"ly-tc-container\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Frequently Asked Questions<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"outdoor-telecom-cabinet-spd-faq\"><\/span>Outdoor telecom cabinet SPD FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <\/div>\r\n\r\n      <div class=\"ly-tc-faq\">\r\n        <details>\r\n          <summary>\r\n            What SPDs are normally required in an outdoor telecom cabinet?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              A cabinet may require an AC input SPD, a 48V or \u221248V DC SPD,\r\n              RJ45 or PoE protection, signal-line SPDs and remote alarm\r\n              contacts. The exact combination depends on the conductive lines\r\n              entering and leaving the cabinet.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Can one SPD protect the complete telecom cabinet?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              Usually not. AC power, DC power, Ethernet, PoE and signal\r\n              circuits have different operating voltages, interfaces and\r\n              performance requirements.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Where should the AC SPD be installed?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              It is commonly installed near the AC cable entry or within the\r\n              AC distribution section before the rectifier and sensitive AC\r\n              loads. The final location must follow the project design.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            How should a \u221248V telecom SPD be selected?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              Confirm the highest continuous voltage, polarity, bonded\r\n              conductor, protection modes, discharge ratings, voltage\r\n              protection level and grounding arrangement.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Can a PV DC SPD be used for a 48V telecom cabinet?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              It should not be treated as a direct substitute. A high-voltage\r\n              photovoltaic circuit and a low-voltage telecom DC bus have\r\n              different system conditions.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Does every RJ45 SPD support PoE and Gigabit Ethernet?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              No. Confirm the data rate, PoE arrangement, powered pairs,\r\n              current, cable category, shielding and insertion-loss\r\n              requirements.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Does an IP65 cabinet prevent internal condensation?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              No. An IP classification addresses defined enclosure-ingress\r\n              conditions. Internal condensation can still occur when\r\n              temperature and humidity change.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Is remote alarm useful for an outdoor telecom cabinet SPD?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              It is useful for remote and unattended cabinets. A\r\n              potential-free contact can report a status change to an NMS,\r\n              PLC, RTU or alarm controller.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            Why should SPD grounding conductors be short?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              Fast surge current can create additional voltage across the\r\n              inductance of long conductors. Short, direct routing reduces\r\n              unnecessary added voltage.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>\r\n            What should a cabinet OEM send before requesting a quote?\r\n          <\/summary>\r\n          <div class=\"ly-tc-faq__body\">\r\n            <p>\r\n              Send the electrical drawing, AC input, maximum DC voltage,\r\n              grounding layout, Ethernet and PoE requirements, signal list,\r\n              remote-alarm logic, mechanical space, environment, documents\r\n              and quantity.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <!-- REFERENCES -->\r\n  <section class=\"ly-tc-section ly-tc-section--pale\" id=\"references\">\r\n    <div class=\"ly-tc-container ly-tc-references\">\r\n      <div class=\"ly-tc-prose\">\r\n        <div class=\"ly-tc-eyebrow\">Authoritative References<\/div>\r\n\r\n        <h2><span class=\"ez-toc-section\" id=\"standards-and-technical-reference-framework\"><\/span>Standards and technical reference framework<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <\/div>\r\n\r\n      <ol>\r\n        <li id=\"ref-1\">\r\n          IEC 61643-11:2025 \u2014 Low-voltage surge protective devices connected\r\n          to AC low-voltage power systems: requirements and test methods.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-2\">\r\n          IEC 61643-41:2025 \u2014 Surge protective devices connected to DC\r\n          low-voltage power systems: requirements and test methods.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-3\">\r\n          IEC 61643-21:2025 \u2014 Surge protective devices connected to\r\n          telecommunications and signalling networks: requirements and test\r\n          methods, including networks carrying power on the same line such as\r\n          Power over Ethernet.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-4\">\r\n          IEC 61643-22:2015 \u2014 Selection and application principles for surge\r\n          protective devices connected to telecommunications and signalling\r\n          networks.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/22772\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-5\">\r\n          ITU-T K.56:2021 \u2014 Protection of radio base stations against\r\n          lightning discharges.\r\n          <a\r\n            href=\"https:\/\/www.itu.int\/rec\/T-REC-K.56-202105-I\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            ITU-T recommendation\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-6\">\r\n          ITU-T K.112:2021 \u2014 Lightning protection, earthing and bonding:\r\n          practical procedures for radio base stations.\r\n          <a\r\n            href=\"https:\/\/www.itu.int\/rec\/T-REC-K.112\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            ITU-T recommendation\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-7\">\r\n          IEC 60529:1989+A1:1999+A2:2013 \u2014 Degrees of protection provided by\r\n          enclosures, IP Code.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/2452\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-8\">\r\n          IEC 61643-12:2020 \u2014 Selection and application principles for SPDs\r\n          connected to AC low-voltage power systems.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/32531\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-9\">\r\n          IEC 62305-4:2024 \u2014 Protection against lightning: electrical and\r\n          electronic systems within structures.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication\r\n          <\/a>\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <div class=\"ly-tc-disclaimer\">\r\n        This page provides a B2B engineering-selection framework. It does not\r\n        replace a project-specific lightning risk assessment, electrical\r\n        design, equipment-manufacturer instruction or local installation\r\n        requirement. Final SPD selection, wiring, backup protection,\r\n        grounding and approval must be confirmed against the actual cabinet\r\n        design and applicable standards.\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Quick Answer An outdoor telecom cabinet normally requires more than one SPD. Protect each conductive AC, DC, Ethernet and signal line according to its actual voltage, interface, installation position and grounding arrangement. Request Cabinet SPD Selection In this guide Protection required Cabinet architecture Selection matrix AC input SPD 48V \/ \u221248V DC SPD RJ45 and&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-30306","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Outdoor Telecom Cabinet SPD Selection Guide | LEEYEE Electrics<\/title>\n<meta name=\"description\" content=\"Discover Outdoor Telecom Cabinet SPD Selection Guide and further information about electrical protection. Find professional customized low-voltage SPD solutions at LEEYEE Electrics.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Outdoor Telecom Cabinet SPD Selection Guide | LEEYEE Electrics\" \/>\n<meta property=\"og:description\" content=\"Discover Outdoor Telecom Cabinet SPD Selection Guide and further information about electrical protection. Find professional customized low-voltage SPD solutions at LEEYEE Electrics.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/outdoor-telecom-cabinet-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-21T08:04:32+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/outdoor-telecom-cabinet-spd\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/outdoor-telecom-cabinet-spd\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Outdoor Telecom Cabinet SPD Selection Guide\",\"datePublished\":\"2026-07-21T08:04:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/outdoor-telecom-cabinet-spd\\\/\"},\"wordCount\":2957,\"articleSection\":[\"News\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/outdoor-telecom-cabinet-spd\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/outdoor-telecom-cabinet-spd\\\/\",\"name\":\"Outdoor Telecom Cabinet SPD Selection Guide | LEEYEE Electrics\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"datePublished\":\"2026-07-21T08:04:32+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Discover Outdoor Telecom Cabinet SPD Selection Guide and further information about electrical protection. 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