{"id":30036,"date":"2026-07-14T14:21:38","date_gmt":"2026-07-14T06:21:38","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30036"},"modified":"2026-07-14T14:37:01","modified_gmt":"2026-07-14T06:37:01","slug":"spd-iimp-12-5ka-vs-25ka-type-1-spd-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/spd-iimp-12-5ka-vs-25ka\/","title":{"rendered":"SPD Iimp 12.5kA vs 25kA: Type 1 SPD Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30036\" class=\"elementor elementor-30036\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-017da25 e-flex e-con-boxed e-con e-parent\" data-id=\"017da25\" 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-ff7b21e elementor-widget elementor-widget-html\" data-id=\"ff7b21e\" 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<style>\r\n  .ly-iimp-guide,\r\n  .ly-iimp-guide * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .ly-iimp-guide {\r\n    --ly-blue: #004898;\r\n    --ly-blue-dark: #00366f;\r\n    --ly-blue-light: #eaf4ff;\r\n    --ly-blue-pale: #f6faff;\r\n    --ly-orange: #e76f27;\r\n    --ly-orange-light: #fff4ec;\r\n    --ly-green: #16835b;\r\n    --ly-green-light: #eef9f4;\r\n    --ly-red: #b83939;\r\n    --ly-red-light: #fff2f2;\r\n    --ly-navy: #172d42;\r\n    --ly-text: #293a49;\r\n    --ly-muted: #5f7080;\r\n    --ly-border: #d9e3ec;\r\n    --ly-light: #f7f9fb;\r\n    --ly-white: #ffffff;\r\n\r\n    width: 100%;\r\n    color: var(--ly-text);\r\n    font-family: Arial, Helvetica, sans-serif;\r\n    font-size: 17px;\r\n    line-height: 1.72;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .ly-iimp-guide button,\r\n  .ly-iimp-guide input,\r\n  .ly-iimp-guide select,\r\n  .ly-iimp-guide textarea {\r\n    font: inherit;\r\n  }\r\n\r\n  .ly-iimp-shell {\r\n    width: min(100%, 1160px);\r\n    margin: 0 auto;\r\n    padding: 8px 30px 72px;\r\n  }\r\n\r\n  .ly-iimp-guide p {\r\n    margin: 0 0 18px;\r\n  }\r\n\r\n  .ly-iimp-guide h2,\r\n  .ly-iimp-guide h3,\r\n  .ly-iimp-guide h4 {\r\n    color: var(--ly-navy);\r\n    line-height: 1.25;\r\n    letter-spacing: -0.02em;\r\n  }\r\n\r\n  .ly-iimp-guide h2 {\r\n    margin: 56px 0 20px;\r\n    padding-top: 4px;\r\n    font-size: 34px;\r\n  }\r\n\r\n  .ly-iimp-guide h3 {\r\n    margin: 32px 0 14px;\r\n    font-size: 24px;\r\n  }\r\n\r\n  .ly-iimp-guide h4 {\r\n    margin: 22px 0 10px;\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-iimp-guide a {\r\n    color: var(--ly-blue);\r\n    text-decoration: underline;\r\n    text-underline-offset: 3px;\r\n  }\r\n\r\n  .ly-iimp-guide img {\r\n    display: block;\r\n    max-width: 100%;\r\n    height: auto;\r\n  }\r\n\r\n  .ly-iimp-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: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.08em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-eyebrow::before {\r\n    width: 28px;\r\n    height: 3px;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-iimp-meta {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 9px 19px;\r\n    margin: 0 0 21px;\r\n    padding: 13px 17px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 10px;\r\n    background: var(--ly-light);\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .ly-iimp-meta-item {\r\n    position: relative;\r\n  }\r\n\r\n  .ly-iimp-meta-item:not(:last-child)::after {\r\n    position: absolute;\r\n    top: 1px;\r\n    right: -11px;\r\n    color: #afbbc5;\r\n    content: \"\u2022\";\r\n  }\r\n\r\n  .ly-iimp-meta strong {\r\n    color: #324b60;\r\n  }\r\n\r\n  .ly-iimp-intro {\r\n    max-width: 960px;\r\n    margin-bottom: 25px;\r\n    color: #405363;\r\n    font-size: 20px;\r\n    line-height: 1.62;\r\n  }\r\n\r\n  .ly-iimp-intro strong {\r\n    color: #162b3f;\r\n  }\r\n\r\n  .ly-iimp-scope {\r\n    margin: 0 0 26px;\r\n    padding: 17px 20px;\r\n    border-left: 4px solid #7aa9d3;\r\n    border-radius: 0 9px 9px 0;\r\n    background: #f5f9fd;\r\n    color: #445d70;\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-iimp-scope strong {\r\n    color: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-iimp-quick {\r\n    position: relative;\r\n    margin: 29px 0;\r\n    padding: 29px 31px;\r\n    border: 1px solid #b9d4ed;\r\n    border-left: 6px solid var(--ly-blue);\r\n    border-radius: 14px;\r\n    background:\r\n      linear-gradient(\r\n        135deg,\r\n        rgba(0, 72, 152, 0.055),\r\n        transparent 62%\r\n      ),\r\n      var(--ly-white);\r\n    box-shadow: 0 10px 28px rgba(20, 53, 83, 0.07);\r\n  }\r\n\r\n  .ly-iimp-quick-label {\r\n    display: block;\r\n    margin-bottom: 9px;\r\n    color: var(--ly-blue);\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.06em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-quick p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-quick strong {\r\n    color: #132b42;\r\n  }\r\n\r\n  .ly-iimp-baseline {\r\n    margin: 18px 0 0;\r\n    padding: 16px 18px;\r\n    border-radius: 9px;\r\n    background: #e6f2ff;\r\n    color: #264d70;\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-iimp-baseline strong {\r\n    color: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-iimp-citation {\r\n    font-size: 0.72em;\r\n    vertical-align: super;\r\n  }\r\n\r\n  .ly-iimp-citation a {\r\n    font-weight: 700;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .ly-iimp-toc {\r\n    margin: 30px 0 42px;\r\n    padding: 24px 26px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 14px;\r\n    background: var(--ly-light);\r\n  }\r\n\r\n  .ly-iimp-toc-title {\r\n    margin: 0 0 14px;\r\n    color: #1c3043;\r\n    font-size: 17px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-iimp-toc-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 10px 18px;\r\n  }\r\n\r\n  .ly-iimp-toc a {\r\n    position: relative;\r\n    display: block;\r\n    padding-left: 17px;\r\n    color: #344b5e;\r\n    font-size: 15px;\r\n    font-weight: 700;\r\n    line-height: 1.45;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .ly-iimp-toc a::before {\r\n    position: absolute;\r\n    top: 8px;\r\n    left: 0;\r\n    width: 7px;\r\n    height: 7px;\r\n    border-radius: 50%;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-iimp-toc a:hover,\r\n  .ly-iimp-toc a:focus {\r\n    color: var(--ly-blue);\r\n    text-decoration: underline;\r\n  }\r\n\r\n  .ly-iimp-decision-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 18px;\r\n    margin: 24px 0 18px;\r\n  }\r\n\r\n  .ly-iimp-decision {\r\n    min-width: 0;\r\n    padding: 23px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 7px 20px rgba(28, 55, 80, 0.055);\r\n  }\r\n\r\n  .ly-iimp-decision-value {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-blue);\r\n    font-size: 27px;\r\n    font-weight: 900;\r\n    line-height: 1.1;\r\n  }\r\n\r\n  .ly-iimp-decision:nth-child(2) .ly-iimp-decision-value {\r\n    color: var(--ly-orange);\r\n  }\r\n\r\n  .ly-iimp-decision:nth-child(3) .ly-iimp-decision-value {\r\n    color: var(--ly-red);\r\n  }\r\n\r\n  .ly-iimp-decision strong {\r\n    display: block;\r\n    margin-bottom: 8px;\r\n    color: #1c3042;\r\n    font-size: 17px;\r\n  }\r\n\r\n  .ly-iimp-decision p {\r\n    margin: 0;\r\n    color: var(--ly-muted);\r\n    font-size: 15px;\r\n    line-height: 1.58;\r\n  }\r\n\r\n  .ly-iimp-figure {\r\n    width: 100%;\r\n    margin: 30px 0 34px;\r\n    overflow: hidden;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 15px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 10px 30px rgba(20, 52, 82, 0.08);\r\n  }\r\n\r\n  .ly-iimp-figure img {\r\n    width: 100%;\r\n    aspect-ratio: 16 \/ 9;\r\n    object-fit: contain;\r\n    background: #f8fbfe;\r\n  }\r\n\r\n  .ly-iimp-figcaption {\r\n    padding: 15px 19px;\r\n    border-top: 1px solid var(--ly-border);\r\n    background: #f8fafc;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-iimp-figcaption strong {\r\n    color: #263f55;\r\n  }\r\n\r\n  .ly-iimp-note,\r\n  .ly-iimp-warning,\r\n  .ly-iimp-critical,\r\n  .ly-iimp-success {\r\n    margin: 22px 0;\r\n    padding: 20px 22px;\r\n    border-radius: 11px;\r\n  }\r\n\r\n  .ly-iimp-note {\r\n    background: var(--ly-blue-light);\r\n    color: #2c4b66;\r\n  }\r\n\r\n  .ly-iimp-note strong {\r\n    color: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-iimp-warning {\r\n    border: 1px solid #efc6a8;\r\n    border-left: 5px solid var(--ly-orange);\r\n    background: var(--ly-orange-light);\r\n    color: #68452e;\r\n  }\r\n\r\n  .ly-iimp-warning strong {\r\n    color: #813f16;\r\n  }\r\n\r\n  .ly-iimp-critical {\r\n    border: 1px solid #e4b5b5;\r\n    border-left: 5px solid var(--ly-red);\r\n    background: var(--ly-red-light);\r\n    color: #694040;\r\n  }\r\n\r\n  .ly-iimp-critical strong {\r\n    color: #922e2e;\r\n  }\r\n\r\n  .ly-iimp-success {\r\n    border: 1px solid #bfe0d2;\r\n    border-left: 5px solid var(--ly-green);\r\n    background: var(--ly-green-light);\r\n    color: #315c4c;\r\n  }\r\n\r\n  .ly-iimp-success strong {\r\n    color: #126443;\r\n  }\r\n\r\n  .ly-iimp-definition {\r\n    display: grid;\r\n    grid-template-columns:\r\n      minmax(0, 1.45fr)\r\n      minmax(260px, 0.55fr);\r\n    gap: 24px;\r\n    align-items: stretch;\r\n    margin: 24px 0;\r\n  }\r\n\r\n  .ly-iimp-definition-main,\r\n  .ly-iimp-definition-side {\r\n    padding: 25px;\r\n    border-radius: 13px;\r\n  }\r\n\r\n  .ly-iimp-definition-main {\r\n    border: 1px solid var(--ly-border);\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-iimp-definition-main p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-definition-side {\r\n    display: flex;\r\n    flex-direction: column;\r\n    justify-content: center;\r\n    background: var(--ly-blue);\r\n    color: var(--ly-white);\r\n    text-align: center;\r\n  }\r\n\r\n  .ly-iimp-definition-side span {\r\n    display: block;\r\n    opacity: 0.82;\r\n    font-size: 14px;\r\n    font-weight: 700;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-definition-side strong {\r\n    display: block;\r\n    margin: 7px 0;\r\n    font-size: 32px;\r\n    line-height: 1;\r\n  }\r\n\r\n  .ly-iimp-definition-side small {\r\n    opacity: 0.88;\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-iimp-energy-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 16px;\r\n    margin: 25px 0;\r\n  }\r\n\r\n  .ly-iimp-energy {\r\n    padding: 21px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 12px;\r\n    background: var(--ly-light);\r\n    text-align: center;\r\n  }\r\n\r\n  .ly-iimp-energy span {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.04em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-energy strong {\r\n    display: block;\r\n    color: var(--ly-blue);\r\n    font-size: 25px;\r\n  }\r\n\r\n  .ly-iimp-energy:nth-child(2) strong {\r\n    color: var(--ly-orange);\r\n  }\r\n\r\n  .ly-iimp-energy:nth-child(3) strong {\r\n    color: #20384c;\r\n  }\r\n\r\n  .ly-iimp-table-wrap {\r\n    width: 100%;\r\n    margin: 24px 0;\r\n    overflow-x: auto;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n    -webkit-overflow-scrolling: touch;\r\n  }\r\n\r\n  .ly-iimp-table {\r\n    width: 100%;\r\n    min-width: 760px;\r\n    border-collapse: collapse;\r\n    table-layout: fixed;\r\n  }\r\n\r\n  .ly-iimp-table th,\r\n  .ly-iimp-table td {\r\n    padding: 15px 17px;\r\n    border-right: 1px solid var(--ly-border);\r\n    border-bottom: 1px solid var(--ly-border);\r\n    text-align: left;\r\n    vertical-align: top;\r\n    line-height: 1.48;\r\n  }\r\n\r\n  .ly-iimp-table th:last-child,\r\n  .ly-iimp-table td:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .ly-iimp-table tr:last-child td,\r\n  .ly-iimp-table tr:last-child th {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-table thead th {\r\n    background: var(--ly-blue);\r\n    color: var(--ly-white);\r\n    font-size: 15px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-iimp-table tbody th {\r\n    background: var(--ly-blue-pale);\r\n    color: #233f57;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-iimp-table tbody tr:nth-child(even) td {\r\n    background: #fbfcfd;\r\n  }\r\n\r\n  .ly-iimp-table td strong {\r\n    color: #20394d;\r\n  }\r\n\r\n  .ly-iimp-scroll-hint {\r\n    display: none;\r\n    margin: -14px 0 17px;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    text-align: right;\r\n  }\r\n\r\n  .ly-iimp-formula {\r\n    margin: 25px 0;\r\n    padding: 25px;\r\n    border-radius: 13px;\r\n    background: #162f46;\r\n    color: var(--ly-white);\r\n    text-align: center;\r\n  }\r\n\r\n  .ly-iimp-formula-label {\r\n    display: block;\r\n    margin-bottom: 10px;\r\n    color: #b9d7ef;\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.06em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-formula strong {\r\n    display: block;\r\n    font-size: 25px;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  .ly-iimp-formula small {\r\n    display: block;\r\n    margin-top: 10px;\r\n    color: #d3e0ea;\r\n    font-size: 14px;\r\n  }\r\n\r\n  .ly-iimp-two-col {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 20px;\r\n    margin: 24px 0;\r\n  }\r\n\r\n  .ly-iimp-panel {\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-iimp-panel h3,\r\n  .ly-iimp-panel h4 {\r\n    margin-top: 0;\r\n  }\r\n\r\n  .ly-iimp-panel p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-list {\r\n    margin: 16px 0 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-iimp-list li {\r\n    position: relative;\r\n    margin: 0 0 11px;\r\n    padding-left: 25px;\r\n  }\r\n\r\n  .ly-iimp-list li::before {\r\n    position: absolute;\r\n    top: 9px;\r\n    left: 2px;\r\n    width: 9px;\r\n    height: 9px;\r\n    border-radius: 50%;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-iimp-list li:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-steps {\r\n    display: grid;\r\n    gap: 16px;\r\n    margin: 25px 0;\r\n    counter-reset: ly-iimp-step;\r\n  }\r\n\r\n  .ly-iimp-step {\r\n    position: relative;\r\n    min-height: 78px;\r\n    padding: 20px 22px 20px 82px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n    counter-increment: ly-iimp-step;\r\n  }\r\n\r\n  .ly-iimp-step::before {\r\n    position: absolute;\r\n    top: 19px;\r\n    left: 21px;\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: 50%;\r\n    background: var(--ly-blue);\r\n    color: var(--ly-white);\r\n    content: counter(ly-iimp-step);\r\n    font-size: 18px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-iimp-step strong {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: #19354d;\r\n    font-size: 18px;\r\n  }\r\n\r\n  .ly-iimp-step p {\r\n    margin: 0;\r\n    color: var(--ly-muted);\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-iimp-checklist {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 13px 18px;\r\n    margin: 22px 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-iimp-checklist li {\r\n    position: relative;\r\n    min-height: 55px;\r\n    margin: 0;\r\n    padding: 15px 16px 15px 47px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n    font-size: 15px;\r\n    line-height: 1.48;\r\n  }\r\n\r\n  .ly-iimp-checklist li::before {\r\n    position: absolute;\r\n    top: 15px;\r\n    left: 16px;\r\n    display: flex;\r\n    width: 21px;\r\n    height: 21px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border-radius: 50%;\r\n    background: var(--ly-green);\r\n    color: var(--ly-white);\r\n    content: \"\u2713\";\r\n    font-size: 13px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-iimp-inline-links {\r\n    margin: 25px 0;\r\n    padding: 22px 24px;\r\n    border: 1px solid #bdd4e8;\r\n    border-radius: 12px;\r\n    background: var(--ly-blue-pale);\r\n  }\r\n\r\n  .ly-iimp-inline-links h3 {\r\n    margin-top: 0;\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-iimp-inline-links p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-rfq {\r\n    margin: 25px 0;\r\n    padding: 26px;\r\n    border: 1px solid #afcce6;\r\n    border-radius: 13px;\r\n    background: var(--ly-blue-pale);\r\n  }\r\n\r\n  .ly-iimp-rfq h3 {\r\n    margin-top: 0;\r\n  }\r\n\r\n  .ly-iimp-rfq-copy {\r\n    margin-top: 17px;\r\n    padding: 21px;\r\n    overflow-x: auto;\r\n    border: 1px dashed #8bb1d2;\r\n    border-radius: 10px;\r\n    background: var(--ly-white);\r\n    color: #344b5e;\r\n    font-family: Consolas, Monaco, \"Courier New\", monospace;\r\n    font-size: 14px;\r\n    line-height: 1.68;\r\n    white-space: pre-line;\r\n  }\r\n\r\n  .ly-iimp-faq {\r\n    margin-top: 25px;\r\n    border-top: 1px solid var(--ly-border);\r\n  }\r\n\r\n  .ly-iimp-faq-item {\r\n    padding: 21px 0;\r\n    border-bottom: 1px solid var(--ly-border);\r\n  }\r\n\r\n  .ly-iimp-faq-item h3 {\r\n    margin: 0 0 9px;\r\n    color: #1b354b;\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-iimp-faq-item p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-iimp-related {\r\n    margin: 50px 0 0;\r\n  }\r\n\r\n  .ly-iimp-related-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 17px;\r\n    margin-top: 22px;\r\n  }\r\n\r\n  .ly-iimp-related-card {\r\n    display: flex;\r\n    min-height: 157px;\r\n    flex-direction: column;\r\n    padding: 21px;\r\n    border: 1px solid var(--ly-border);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n    color: var(--ly-text);\r\n    text-decoration: none !important;\r\n    transition:\r\n      transform 0.2s ease,\r\n      border-color 0.2s ease,\r\n      box-shadow 0.2s ease;\r\n  }\r\n\r\n  .ly-iimp-related-card:hover,\r\n  .ly-iimp-related-card:focus {\r\n    border-color: #91b8da;\r\n    box-shadow: 0 9px 24px rgba(25, 58, 87, 0.08);\r\n    transform: translateY(-2px);\r\n  }\r\n\r\n  .ly-iimp-related-label {\r\n    display: block;\r\n    margin-bottom: 8px;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.05em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-iimp-related-card strong {\r\n    display: block;\r\n    margin-bottom: 8px;\r\n    color: #1e394f;\r\n    font-size: 17px;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  .ly-iimp-related-card small {\r\n    display: block;\r\n    margin-top: auto;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-iimp-cta {\r\n    margin: 55px 0 20px;\r\n    padding: 31px;\r\n    border-radius: 15px;\r\n    background:\r\n      radial-gradient(\r\n        circle at 90% 10%,\r\n        rgba(255, 255, 255, 0.12),\r\n        transparent 28%\r\n      ),\r\n      linear-gradient(135deg, #003d81, #0059af);\r\n    color: var(--ly-white);\r\n    text-align: left;\r\n  }\r\n\r\n  .ly-iimp-cta-grid {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1fr) auto;\r\n    gap: 25px;\r\n    align-items: center;\r\n  }\r\n\r\n  .ly-iimp-cta h2 {\r\n    margin: 0 0 10px;\r\n    padding: 0;\r\n    color: var(--ly-white);\r\n    font-size: 29px;\r\n  }\r\n\r\n  .ly-iimp-cta p {\r\n    max-width: 730px;\r\n    margin: 0;\r\n    color: #e5f0fa;\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-iimp-btn {\r\n    display: inline-flex;\r\n    min-width: 220px;\r\n    min-height: 50px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    padding: 13px 23px;\r\n    border: 2px solid var(--ly-white);\r\n    border-radius: 7px;\r\n    background: var(--ly-white);\r\n    color: var(--ly-blue);\r\n    cursor: pointer;\r\n    font-weight: 800;\r\n    line-height: 1.2;\r\n    text-align: center;\r\n    text-decoration: none;\r\n    transition:\r\n      transform 0.2s ease,\r\n      background 0.2s ease,\r\n      color 0.2s ease;\r\n  }\r\n\r\n  .ly-iimp-btn:hover,\r\n  .ly-iimp-btn:focus {\r\n    background: transparent;\r\n    color: var(--ly-white);\r\n    transform: translateY(-1px);\r\n  }\r\n\r\n  .ly-iimp-btn span {\r\n    display: inline-block;\r\n    color: inherit;\r\n  }\r\n\r\n  .ly-iimp-sources {\r\n    margin-top: 48px;\r\n    padding-top: 26px;\r\n    border-top: 2px solid var(--ly-border);\r\n  }\r\n\r\n  .ly-iimp-sources h2 {\r\n    margin-top: 0;\r\n    font-size: 27px;\r\n  }\r\n\r\n  .ly-iimp-sources ol {\r\n    margin: 0;\r\n    padding-left: 22px;\r\n  }\r\n\r\n  .ly-iimp-sources li {\r\n    margin-bottom: 13px;\r\n    padding-left: 4px;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.58;\r\n  }\r\n\r\n  .ly-iimp-source-note {\r\n    margin-top: 20px;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n  }\r\n\r\n  @media (max-width: 1440px) {\r\n    .ly-iimp-shell {\r\n      width: min(100%, 1130px);\r\n      padding-right: 28px;\r\n      padding-left: 28px;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      font-size: 33px;\r\n    }\r\n\r\n    .ly-iimp-figure {\r\n      margin-top: 29px;\r\n      margin-bottom: 33px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1366px) {\r\n    .ly-iimp-shell {\r\n      width: min(100%, 1090px);\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      max-width: 920px;\r\n    }\r\n\r\n    .ly-iimp-decision {\r\n      padding: 21px;\r\n    }\r\n\r\n    .ly-iimp-related-card {\r\n      padding: 20px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1280px) {\r\n    .ly-iimp-shell {\r\n      width: min(100%, 1030px);\r\n      padding-right: 26px;\r\n      padding-left: 26px;\r\n    }\r\n\r\n    .ly-iimp-toc-grid {\r\n      gap: 9px 15px;\r\n    }\r\n\r\n    .ly-iimp-table th,\r\n    .ly-iimp-table td {\r\n      padding: 14px 15px;\r\n    }\r\n\r\n    .ly-iimp-related-grid {\r\n      gap: 15px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1024px) {\r\n    .ly-iimp-shell {\r\n      width: 100%;\r\n      padding-right: 25px;\r\n      padding-left: 25px;\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-iimp-decision-grid,\r\n    .ly-iimp-energy-grid {\r\n      gap: 15px;\r\n    }\r\n\r\n    .ly-iimp-definition {\r\n      grid-template-columns:\r\n        minmax(0, 1.35fr)\r\n        minmax(230px, 0.65fr);\r\n    }\r\n\r\n    .ly-iimp-cta {\r\n      padding: 28px;\r\n    }\r\n\r\n    .ly-iimp-related-card strong {\r\n      font-size: 16px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 912px) {\r\n    .ly-iimp-guide h2 {\r\n      margin-top: 51px;\r\n      font-size: 32px;\r\n    }\r\n\r\n    .ly-iimp-toc-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-iimp-decision-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-iimp-decision:last-child {\r\n      grid-column: 1 \/ -1;\r\n    }\r\n\r\n    .ly-iimp-definition {\r\n      grid-template-columns: minmax(0, 1fr) 250px;\r\n    }\r\n\r\n    .ly-iimp-related-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-iimp-cta-grid {\r\n      grid-template-columns: minmax(0, 1fr) 210px;\r\n    }\r\n\r\n    .ly-iimp-btn {\r\n      min-width: 210px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 820px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 22px;\r\n      padding-left: 22px;\r\n    }\r\n\r\n    .ly-iimp-two-col {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-definition {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-definition-side {\r\n      min-height: 170px;\r\n    }\r\n\r\n    .ly-iimp-energy-grid {\r\n      grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-iimp-checklist {\r\n      gap: 12px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .ly-iimp-guide {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-iimp-shell {\r\n      padding: 8px 21px 60px;\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      font-size: 18px;\r\n    }\r\n\r\n    .ly-iimp-quick {\r\n      padding: 25px;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      margin-top: 47px;\r\n      font-size: 30px;\r\n    }\r\n\r\n    .ly-iimp-guide h3 {\r\n      font-size: 22px;\r\n    }\r\n\r\n    .ly-iimp-energy-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-energy {\r\n      text-align: left;\r\n    }\r\n\r\n    .ly-iimp-checklist {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-scroll-hint {\r\n      display: block;\r\n    }\r\n\r\n    .ly-iimp-step {\r\n      padding-left: 76px;\r\n    }\r\n\r\n    .ly-iimp-cta-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-btn {\r\n      width: fit-content;\r\n    }\r\n\r\n    .ly-iimp-meta {\r\n      gap: 7px 15px;\r\n    }\r\n\r\n    .ly-iimp-meta-item:not(:last-child)::after {\r\n      right: -9px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 600px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 19px;\r\n      padding-left: 19px;\r\n    }\r\n\r\n    .ly-iimp-eyebrow {\r\n      font-size: 12px;\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      font-size: 17px;\r\n      line-height: 1.58;\r\n    }\r\n\r\n    .ly-iimp-toc {\r\n      padding: 21px;\r\n    }\r\n\r\n    .ly-iimp-toc-grid,\r\n    .ly-iimp-decision-grid,\r\n    .ly-iimp-related-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .ly-iimp-decision:last-child {\r\n      grid-column: auto;\r\n    }\r\n\r\n    .ly-iimp-definition-main,\r\n    .ly-iimp-definition-side,\r\n    .ly-iimp-panel {\r\n      padding: 21px;\r\n    }\r\n\r\n    .ly-iimp-table {\r\n      min-width: 700px;\r\n    }\r\n\r\n    .ly-iimp-rfq {\r\n      padding: 22px;\r\n    }\r\n\r\n    .ly-iimp-cta {\r\n      margin-top: 46px;\r\n      padding: 26px;\r\n    }\r\n\r\n    .ly-iimp-cta h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    .ly-iimp-related-card {\r\n      min-height: 0;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 540px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 18px;\r\n      padding-left: 18px;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      margin-top: 43px;\r\n      font-size: 28px;\r\n    }\r\n\r\n    .ly-iimp-quick {\r\n      padding: 22px;\r\n      border-left-width: 5px;\r\n    }\r\n\r\n    .ly-iimp-formula {\r\n      padding: 22px 17px;\r\n    }\r\n\r\n    .ly-iimp-formula strong {\r\n      font-size: 22px;\r\n    }\r\n\r\n    .ly-iimp-rfq-copy {\r\n      padding: 18px;\r\n      font-size: 13px;\r\n    }\r\n\r\n    .ly-iimp-meta {\r\n      display: block;\r\n    }\r\n\r\n    .ly-iimp-meta-item {\r\n      display: block;\r\n      margin-bottom: 5px;\r\n    }\r\n\r\n    .ly-iimp-meta-item:last-child {\r\n      margin-bottom: 0;\r\n    }\r\n\r\n    .ly-iimp-meta-item:not(:last-child)::after {\r\n      display: none;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 480px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 16px;\r\n      padding-left: 16px;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    .ly-iimp-guide h3 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      font-size: 16.5px;\r\n    }\r\n\r\n    .ly-iimp-toc,\r\n    .ly-iimp-decision,\r\n    .ly-iimp-definition-main,\r\n    .ly-iimp-definition-side,\r\n    .ly-iimp-panel,\r\n    .ly-iimp-related-card {\r\n      border-radius: 11px;\r\n    }\r\n\r\n    .ly-iimp-step {\r\n      min-height: 74px;\r\n      padding: 18px 17px 18px 68px;\r\n    }\r\n\r\n    .ly-iimp-step::before {\r\n      top: 17px;\r\n      left: 16px;\r\n      width: 38px;\r\n      height: 38px;\r\n    }\r\n\r\n    .ly-iimp-btn {\r\n      width: 100%;\r\n      min-width: 0;\r\n    }\r\n\r\n    .ly-iimp-cta {\r\n      text-align: center;\r\n    }\r\n\r\n    .ly-iimp-figure {\r\n      border-radius: 10px;\r\n    }\r\n\r\n    .ly-iimp-figcaption {\r\n      padding: 12px 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 430px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 15px;\r\n      padding-left: 15px;\r\n    }\r\n\r\n    .ly-iimp-quick,\r\n    .ly-iimp-note,\r\n    .ly-iimp-warning,\r\n    .ly-iimp-critical,\r\n    .ly-iimp-success {\r\n      padding: 19px;\r\n    }\r\n\r\n    .ly-iimp-decision-value {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .ly-iimp-inline-links,\r\n    .ly-iimp-related-card {\r\n      padding: 19px;\r\n    }\r\n\r\n    .ly-iimp-cta {\r\n      padding: 24px 20px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 414px) {\r\n    .ly-iimp-guide {\r\n      line-height: 1.66;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      font-size: 26px;\r\n    }\r\n\r\n    .ly-iimp-toc {\r\n      padding: 19px;\r\n    }\r\n\r\n    .ly-iimp-definition-side strong {\r\n      font-size: 29px;\r\n    }\r\n\r\n    .ly-iimp-table {\r\n      min-width: 670px;\r\n    }\r\n\r\n    .ly-iimp-faq-item h3 {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-iimp-figcaption {\r\n      font-size: 12.5px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 390px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 14px;\r\n      padding-left: 14px;\r\n    }\r\n\r\n    .ly-iimp-eyebrow {\r\n      gap: 7px;\r\n    }\r\n\r\n    .ly-iimp-eyebrow::before {\r\n      width: 22px;\r\n    }\r\n\r\n    .ly-iimp-quick-label {\r\n      font-size: 12px;\r\n    }\r\n\r\n    .ly-iimp-decision,\r\n    .ly-iimp-panel {\r\n      padding: 19px;\r\n    }\r\n\r\n    .ly-iimp-rfq {\r\n      padding: 19px;\r\n    }\r\n\r\n    .ly-iimp-rfq-copy {\r\n      padding: 16px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 375px) {\r\n    .ly-iimp-guide h2 {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .ly-iimp-guide h3 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .ly-iimp-intro {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-iimp-definition-main,\r\n    .ly-iimp-definition-side {\r\n      padding: 18px;\r\n    }\r\n\r\n    .ly-iimp-step {\r\n      padding-left: 64px;\r\n    }\r\n\r\n    .ly-iimp-step::before {\r\n      left: 14px;\r\n    }\r\n\r\n    .ly-iimp-cta h2 {\r\n      font-size: 25px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 360px) {\r\n    .ly-iimp-shell {\r\n      padding-right: 13px;\r\n      padding-left: 13px;\r\n    }\r\n\r\n    .ly-iimp-quick {\r\n      padding: 18px 17px;\r\n    }\r\n\r\n    .ly-iimp-toc {\r\n      padding: 18px 17px;\r\n    }\r\n\r\n    .ly-iimp-formula strong {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .ly-iimp-faq-item {\r\n      padding: 18px 0;\r\n    }\r\n\r\n    .ly-iimp-sources li {\r\n      font-size: 13px;\r\n    }\r\n\r\n    .ly-iimp-figcaption {\r\n      padding: 10px 12px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 320px) {\r\n    .ly-iimp-guide {\r\n      font-size: 15.5px;\r\n    }\r\n\r\n    .ly-iimp-shell {\r\n      padding-right: 11px;\r\n      padding-left: 11px;\r\n    }\r\n\r\n    .ly-iimp-guide h2 {\r\n      font-size: 23px;\r\n    }\r\n\r\n    .ly-iimp-guide h3 {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-iimp-decision-value {\r\n      font-size: 23px;\r\n    }\r\n\r\n    .ly-iimp-step {\r\n      padding: 17px 14px 17px 58px;\r\n    }\r\n\r\n    .ly-iimp-step::before {\r\n      left: 12px;\r\n      width: 34px;\r\n      height: 34px;\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-iimp-cta {\r\n      padding: 22px 16px;\r\n    }\r\n\r\n    .ly-iimp-btn {\r\n      padding-right: 15px;\r\n      padding-left: 15px;\r\n      font-size: 14px;\r\n    }\r\n\r\n    .ly-iimp-figcaption {\r\n      font-size: 12px;\r\n    }\r\n  }\r\n\r\n  @media (prefers-reduced-motion: reduce) {\r\n    .ly-iimp-btn,\r\n    .ly-iimp-related-card {\r\n      transition: none;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<article\r\n  class=\"ly-iimp-guide\"\r\n  itemscope\r\n  itemtype=\"https:\/\/schema.org\/Article\"\r\n>\r\n  <div class=\"ly-iimp-shell\">\r\n\r\n    <span class=\"ly-iimp-eyebrow\">\r\n      Type 1 SPD Engineering and OEM Guide\r\n    <\/span>\r\n\r\n    <div class=\"ly-iimp-meta\" aria-label=\"Article information\">\r\n      <span class=\"ly-iimp-meta-item\">\r\n        <strong>Published:<\/strong>\r\n        <time datetime=\"2026-07-14\">July 14, 2026<\/time>\r\n      <\/span>\r\n\r\n      <span class=\"ly-iimp-meta-item\">\r\n        <strong>Technical review:<\/strong>\r\n        LEEYEE SPD Engineering Team\r\n      <\/span>\r\n\r\n      <span class=\"ly-iimp-meta-item\">\r\n        <strong>Standards reviewed:<\/strong>\r\n        IEC 61643-11:2025 and IEC 61643-12:2020\r\n      <\/span>\r\n    <\/div>\r\n\r\n    <p class=\"ly-iimp-intro\">\r\n      When a project already requires a\r\n      <strong>Type 1 or Type 1+2 surge protective device<\/strong>,\r\n      the next question is usually whether its lightning impulse current\r\n      rating should be <strong>Iimp 12.5kA or 25kA<\/strong>.\r\n      The correct rating depends on the project\u2019s lightning protection\r\n      level, expected current sharing, protection modes and the way the\r\n      manufacturer declares the value.\r\n    <\/p>\r\n\r\n    <div class=\"ly-iimp-scope\">\r\n      <strong>Technical scope:<\/strong>\r\n      This guide assumes that Type 1 protection has already been specified.\r\n      It does not repeat the general difference between Type 1, Type 2 and\r\n      Type 3 SPDs. It focuses only on selecting the correct Iimp rating.\r\n    <\/div>\r\n\r\n    <div class=\"ly-iimp-quick\">\r\n      <span class=\"ly-iimp-quick-label\">Quick answer<\/span>\r\n\r\n      <p>\r\n        Select <strong>Iimp 12.5kA<\/strong> when the calculation or\r\n        accepted project rule shows that the required 10\/350&nbsp;\u03bcs\r\n        impulse-current capability is no more than 12.5kA through the\r\n        declared pole, branch or mode of protection. This is commonly\r\n        associated with LPL III and IV installations.\r\n      <\/p>\r\n\r\n      <p>\r\n        Select <strong>Iimp 25kA<\/strong> where the required duty is above\r\n        12.5kA and no more than 25kA. LPL I commonly produces a 25kA\r\n        requirement in a simplified four-path calculation. LPL II produces\r\n        an illustrative value of 18.75kA, so the next higher common product\r\n        rating is normally 25kA.\r\n      <\/p>\r\n\r\n      <p>\r\n        Do not select from the largest number on the data sheet. Confirm\r\n        whether Iimp applies to one pole, one mode of protection or the\r\n        complete SPD arrangement, and check Itotal separately.\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-baseline\">\r\n        <strong>Common baseline:<\/strong>\r\n        where no national regulation or building-specific requirement sets\r\n        a higher value, a frequently referenced minimum is\r\n        <strong>Iimp 12.5kA at 10\/350 \u03bcs per branch<\/strong>.\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-3\" aria-label=\"Reference 3\">[3]<\/a>\r\n        <\/sup>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <nav class=\"ly-iimp-toc\" aria-label=\"Article contents\">\r\n      <p class=\"ly-iimp-toc-title\">On this page<\/p>\r\n\r\n      <div class=\"ly-iimp-toc-grid\">\r\n        <a href=\"#decision\">12.5kA or 25kA<\/a>\r\n        <a href=\"#what-is-iimp\">What Iimp means<\/a>\r\n        <a href=\"#waveform\">10\/350 \u03bcs waveform<\/a>\r\n        <a href=\"#comparison\">Main differences<\/a>\r\n        <a href=\"#lpl-selection\">LPL-based selection<\/a>\r\n        <a href=\"#project-selection\">Real project selection<\/a>\r\n        <a href=\"#per-pole-total\">Per mode vs Itotal<\/a>\r\n        <a href=\"#selection-process\">Selection process<\/a>\r\n        <a href=\"#purchasing-checklist\">OEM checklist<\/a>\r\n        <a href=\"#faq\">Frequently asked questions<\/a>\r\n      <\/div>\r\n    <\/nav>\r\n\r\n    <section id=\"decision\" aria-labelledby=\"decision-heading\">\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\/spd-iimp-12-5ka-vs-25ka\/#iimp-125ka-or-25ka-decision-in-30-seconds\" >Iimp 12.5kA or 25kA: Decision in 30 Seconds<\/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\/spd-iimp-12-5ka-vs-25ka\/#what-is-iimp-on-a-type-1-spd\" >What Is Iimp on a Type 1 SPD?<\/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\/spd-iimp-12-5ka-vs-25ka\/#what-does-the-10350-%ce%bcs-waveform-mean\" >What Does the 10\/350 \u03bcs Waveform Mean?<\/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\/spd-iimp-12-5ka-vs-25ka\/#iimp-125ka-vs-25ka-main-differences\" >Iimp 12.5kA vs 25kA: Main Differences<\/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\/spd-iimp-12-5ka-vs-25ka\/#how-lightning-protection-level-affects-iimp\" >How Lightning Protection Level Affects Iimp<\/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\/spd-iimp-12-5ka-vs-25ka\/#how-to-choose-iimp-in-real-projects\" >How to Choose Iimp in Real Projects<\/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\/spd-iimp-12-5ka-vs-25ka\/#do-not-confuse-per-path-iimp-with-itotal\" >Do Not Confuse Per-Path Iimp with Itotal<\/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\/spd-iimp-12-5ka-vs-25ka\/#practical-type-1-spd-iimp-selection-process\" >Practical Type 1 SPD Iimp Selection Process<\/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\/spd-iimp-12-5ka-vs-25ka\/#type-12-spd-bulk-purchasing-checklist\" >Type 1+2 SPD Bulk-Purchasing Checklist<\/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\/spd-iimp-12-5ka-vs-25ka\/#frequently-asked-questions\" >Frequently Asked 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\/spd-iimp-12-5ka-vs-25ka\/#related-spd-selection-guides\" >Related SPD Selection Guides<\/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\/spd-iimp-12-5ka-vs-25ka\/#need-a-type-12-spd-specification-for-an-oem-order\" >Need a Type 1+2 SPD Specification for an OEM Order?<\/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\/spd-iimp-12-5ka-vs-25ka\/#technical-references\" >Technical References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"decision-heading\"><span class=\"ez-toc-section\" id=\"iimp-125ka-or-25ka-decision-in-30-seconds\"><\/span>\r\n        Iimp 12.5kA or 25kA: Decision in 30 Seconds\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-decision-grid\">\r\n        <div class=\"ly-iimp-decision\">\r\n          <span class=\"ly-iimp-decision-value\">12.5kA<\/span>\r\n          <strong>Requirement no higher than 12.5kA<\/strong>\r\n          <p>\r\n            Common for LPL III\/IV installations when the current-sharing\r\n            calculation supports 12.5kA or less through each declared\r\n            protection path.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-decision\">\r\n          <span class=\"ly-iimp-decision-value\">25kA<\/span>\r\n          <strong>Requirement above 12.5kA<\/strong>\r\n          <p>\r\n            Common for LPL I and for LPL II projects where the illustrative\r\n            18.75kA result must be rounded upward to an available 25kA\r\n            product rating.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-decision\">\r\n          <span class=\"ly-iimp-decision-value\">Calculate<\/span>\r\n          <strong>LPL or current sharing is unknown<\/strong>\r\n          <p>\r\n            Do not decide from the building type or local thunderstorm\r\n            frequency alone. Obtain the LPS class, supply arrangement and\r\n            current-distribution basis.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-iimp-warning\">\r\n        <strong>Important:<\/strong>\r\n        a 25kA SPD is not automatically \u201ctwice as protective\u201d for connected\r\n        equipment. It withstands a higher 10\/350 \u03bcs current duty, but the\r\n        voltage reaching the equipment also depends on Up, connection\r\n        length, wiring layout and downstream SPD coordination.\r\n      <\/div>\r\n\r\n      <figure class=\"ly-iimp-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-iimp-12-5ka-vs-25ka-comparison.webp\"\r\n          alt=\"SPD Iimp 12.5kA vs 25kA comparison for Type 1 surge protection\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\"\r\n        >\r\n\r\n        <figcaption class=\"ly-iimp-figcaption\">\r\n          <strong>Iimp 12.5kA vs 25kA:<\/strong>\r\n          both ratings use the 10\/350 \u03bcs waveform, but the 25kA protection\r\n          path is tested for a substantially higher lightning-current\r\n          stress.\r\n        <\/figcaption>\r\n      <\/figure>\r\n    <\/section>\r\n\r\n    <section id=\"what-is-iimp\" aria-labelledby=\"what-is-iimp-heading\">\r\n      <h2 id=\"what-is-iimp-heading\"><span class=\"ez-toc-section\" id=\"what-is-iimp-on-a-type-1-spd\"><\/span>\r\n        What Is Iimp on a Type 1 SPD?\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-definition\">\r\n        <div class=\"ly-iimp-definition-main\">\r\n          <p>\r\n            <strong>Iimp<\/strong> is the peak impulse-current value used to\r\n            express the lightning-current handling capability of a Type 1\r\n            SPD. It is stated in kiloamperes and associated with the\r\n            <strong>10\/350 \u03bcs waveform<\/strong>.\r\n          <\/p>\r\n\r\n          <p>\r\n            IEC 61643-11:2025 is the current requirements and test-method\r\n            standard for SPDs connected to AC low-voltage systems.\r\n            IEC 61643-12:2020 provides selection, operation, location and\r\n            coordination principles.\r\n            <sup class=\"ly-iimp-citation\">\r\n              <a href=\"#ref-1\" aria-label=\"Reference 1\">[1]<\/a>\r\n            <\/sup>\r\n            <sup class=\"ly-iimp-citation\">\r\n              <a href=\"#ref-2\" aria-label=\"Reference 2\">[2]<\/a>\r\n            <\/sup>\r\n          <\/p>\r\n\r\n          <p>\r\n            Iimp must not be confused with <strong>In<\/strong> or\r\n            <strong>Imax<\/strong>. Those values normally use the shorter\r\n            8\/20 \u03bcs waveform associated with the Type 2 function.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div\r\n          class=\"ly-iimp-definition-side\"\r\n          aria-label=\"Iimp definition\"\r\n        >\r\n          <span>Type 1 key parameter<\/span>\r\n          <strong>Iimp<\/strong>\r\n          <small>Peak impulse current at 10\/350 \u03bcs<\/small>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-iimp-critical\">\r\n        <strong>Do not compare only the kA number.<\/strong>\r\n        A Type 2 SPD marked Imax 40kA at 8\/20 \u03bcs is not automatically\r\n        stronger than a Type 1 SPD marked Iimp 12.5kA at 10\/350 \u03bcs.\r\n        They represent different waveform duration, charge and energy\r\n        stresses.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"waveform\" aria-labelledby=\"waveform-heading\">\r\n      <h2 id=\"waveform-heading\"><span class=\"ez-toc-section\" id=\"what-does-the-10350-%ce%bcs-waveform-mean\"><\/span>\r\n        What Does the 10\/350 \u03bcs Waveform Mean?\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The notation describes a standardized current impulse. The waveform\r\n        rises rapidly toward its peak and then decays over a much longer\r\n        period than the 8\/20 \u03bcs waveform used for Type 2 testing.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-iimp-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/10-350-vs-8-20-spd-current-waveform.webp\"\r\n          alt=\"10\/350 microsecond Iimp waveform vs 8\/20 microsecond SPD current waveform\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\"\r\n        >\r\n\r\n        <figcaption class=\"ly-iimp-figcaption\">\r\n          <strong>10\/350 \u03bcs and 8\/20 \u03bcs are different test stresses.<\/strong>\r\n          Iimp 12.5kA cannot be compared directly with an In or Imax value\r\n          simply by checking which kA number is larger.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <h3>What changes when Iimp rises from 12.5kA to 25kA?<\/h3>\r\n\r\n      <p>\r\n        When the standardized waveform shape remains the same, increasing\r\n        the peak current from 12.5kA to 25kA doubles the peak current and\r\n        approximately doubles the charge. Because specific energy is\r\n        related to the integral of current squared, the specific-energy\r\n        duty increases by approximately four times.\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-energy-grid\">\r\n        <div class=\"ly-iimp-energy\">\r\n          <span>Peak current<\/span>\r\n          <strong>2\u00d7<\/strong>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-energy\">\r\n          <span>Approximate charge<\/span>\r\n          <strong>2\u00d7<\/strong>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-energy\">\r\n          <span>Approximate specific energy<\/span>\r\n          <strong>4\u00d7<\/strong>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-iimp-note\">\r\n        <strong>This is an impulse-current comparison.<\/strong>\r\n        It does not mean that the 25kA product has half the residual voltage\r\n        or provides four times better protection to the final equipment.\r\n        Compare the voltage protection level Up separately.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"comparison\" aria-labelledby=\"comparison-heading\">\r\n      <h2 id=\"comparison-heading\"><span class=\"ez-toc-section\" id=\"iimp-125ka-vs-25ka-main-differences\"><\/span>\r\n        Iimp 12.5kA vs 25kA: Main Differences\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-table-wrap\">\r\n        <table class=\"ly-iimp-table\">\r\n          <thead>\r\n            <tr>\r\n              <th scope=\"col\">Comparison point<\/th>\r\n              <th scope=\"col\">Iimp 12.5kA<\/th>\r\n              <th scope=\"col\">Iimp 25kA<\/th>\r\n              <th scope=\"col\">What the buyer should confirm<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <th scope=\"row\">Test waveform<\/th>\r\n              <td>10\/350 \u03bcs<\/td>\r\n              <td>10\/350 \u03bcs<\/td>\r\n              <td>\r\n                Both values must be declared using the same waveform.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Peak current<\/th>\r\n              <td>12.5kA through the declared path or mode<\/td>\r\n              <td>25kA through the declared path or mode<\/td>\r\n              <td>\r\n                Check exactly where the declared value applies.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Typical LPL association<\/th>\r\n              <td>LPL III and IV<\/td>\r\n              <td>\r\n                LPL I; also commonly selected for LPL II\r\n              <\/td>\r\n              <td>\r\n                LPL II has an illustrative calculated value of 18.75kA,\r\n                which is normally rounded upward to 25kA.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Impulse-energy duty<\/th>\r\n              <td>Lower<\/td>\r\n              <td>\r\n                Approximately four times the specific-energy duty for the\r\n                same waveform shape\r\n              <\/td>\r\n              <td>\r\n                Product technology, size and follow-current performance may\r\n                differ.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Voltage protection level Up<\/th>\r\n              <td>Product-specific<\/td>\r\n              <td>Product-specific<\/td>\r\n              <td>\r\n                A higher Iimp does not guarantee a lower Up.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Typical selection basis<\/th>\r\n              <td>\r\n                Required duty no higher than 12.5kA\r\n              <\/td>\r\n              <td>\r\n                Required duty above 12.5kA and no higher than 25kA\r\n              <\/td>\r\n              <td>\r\n                Use the next certified rating equal to or above the\r\n                calculated requirement.\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Commercial impact<\/th>\r\n              <td>\r\n                Often more compact and economical\r\n              <\/td>\r\n              <td>\r\n                Often larger or based on a higher-energy design\r\n              <\/td>\r\n              <td>\r\n                Check DIN width, terminal size, backup protection and panel\r\n                space.\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p class=\"ly-iimp-scroll-hint\">\r\n        Swipe horizontally to view the complete table.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section id=\"lpl-selection\" aria-labelledby=\"lpl-heading\">\r\n      <h2 id=\"lpl-heading\"><span class=\"ez-toc-section\" id=\"how-lightning-protection-level-affects-iimp\"><\/span>\r\n        How Lightning Protection Level Affects Iimp\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        IEC 62305 defines lightning protection levels and provides the\r\n        basis for lightning risk management and surge protection measures.\r\n        The 2024 edition also gives greater attention to surge-current\r\n        dimensioning and current-sharing considerations.\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-6\" aria-label=\"Reference 6\">[6]<\/a>\r\n        <\/sup>\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-7\" aria-label=\"Reference 7\">[7]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-formula\">\r\n        <span class=\"ly-iimp-formula-label\">\r\n          Simplified current-sharing concept\r\n        <\/span>\r\n\r\n        <strong>\r\n          Required Iimp per protection path \u2248 current entering connected\r\n          services \u00f7 effective current paths\r\n        <\/strong>\r\n\r\n        <small>\r\n          Real projects must consider the earthing arrangement, incoming\r\n          conductors, cable shields, bonded metallic services and unequal\r\n          current sharing.\r\n        <\/small>\r\n      <\/div>\r\n\r\n      <figure class=\"ly-iimp-figure\">\r\n        <img loading=\"lazy\"\r\n          src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/lpl-lightning-current-sharing-iimp-selection.webp\"\r\n          alt=\"Lightning protection level current sharing for 12.5kA and 25kA Iimp SPD selection\"\r\n          width=\"1600\"\r\n          height=\"900\"\r\n          loading=\"lazy\"\r\n          decoding=\"async\"\r\n        >\r\n\r\n        <figcaption class=\"ly-iimp-figcaption\">\r\n          <strong>Simplified current-sharing example:<\/strong>\r\n          100kA \u00d7 50% \u00f7 4 gives 12.5kA per path for the illustrated\r\n          LPL III case. 200kA \u00d7 50% \u00f7 4 gives 25kA per path for the\r\n          illustrated LPL I case. Actual current sharing may be unequal.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-iimp-table-wrap\">\r\n        <table class=\"ly-iimp-table\">\r\n          <thead>\r\n            <tr>\r\n              <th scope=\"col\">Lightning protection level<\/th>\r\n              <th scope=\"col\">Reference lightning current<\/th>\r\n              <th scope=\"col\">Illustrative four-path calculation<\/th>\r\n              <th scope=\"col\">Common practical selection<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <th scope=\"row\">LPL I<\/th>\r\n              <td>200kA<\/td>\r\n              <td>\r\n                200kA \u00d7 50% \u00f7 4 = 25kA per path\r\n              <\/td>\r\n              <td>\r\n                <strong>Iimp 25kA<\/strong>\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">LPL II<\/th>\r\n              <td>150kA<\/td>\r\n              <td>\r\n                150kA \u00d7 50% \u00f7 4 = 18.75kA per path\r\n              <\/td>\r\n              <td>\r\n                <strong>Iimp 25kA<\/strong> as the next higher common rating\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">LPL III<\/th>\r\n              <td>100kA<\/td>\r\n              <td>\r\n                100kA \u00d7 50% \u00f7 4 = 12.5kA per path\r\n              <\/td>\r\n              <td>\r\n                <strong>Iimp 12.5kA<\/strong>\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">LPL IV<\/th>\r\n              <td>100kA reference class value<\/td>\r\n              <td>\r\n                Commonly evaluated on a similar 12.5kA-per-path basis\r\n              <\/td>\r\n              <td>\r\n                <strong>Iimp 12.5kA<\/strong>\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p class=\"ly-iimp-scroll-hint\">\r\n        Swipe horizontally to view the complete table.\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-warning\">\r\n        <strong>This is a simplified explanatory calculation.<\/strong>\r\n        It does not prove that exactly 50% of every lightning current enters\r\n        the electrical installation or that the current always divides\r\n        equally among four conductors. The project design takes precedence.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      id=\"project-selection\"\r\n      aria-labelledby=\"project-selection-heading\"\r\n    >\r\n      <h2 id=\"project-selection-heading\"><span class=\"ez-toc-section\" id=\"how-to-choose-iimp-in-real-projects\"><\/span>\r\n        How to Choose Iimp in Real Projects\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-two-col\">\r\n        <div class=\"ly-iimp-panel\">\r\n          <h3>12.5kA may be suitable when<\/h3>\r\n\r\n          <ul class=\"ly-iimp-list\">\r\n            <li>\r\n              The design is based on LPL III or IV.\r\n            <\/li>\r\n            <li>\r\n              The required duty is no more than 12.5kA through each\r\n              declared protection path.\r\n            <\/li>\r\n            <li>\r\n              The service and bonding arrangement matches the calculation.\r\n            <\/li>\r\n            <li>\r\n              The exact SPD topology is certified for the network system.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-panel\">\r\n          <h3>25kA may be required when<\/h3>\r\n\r\n          <ul class=\"ly-iimp-list\">\r\n            <li>\r\n              The structure is designed to LPL I or II.\r\n            <\/li>\r\n            <li>\r\n              The calculated requirement exceeds 12.5kA.\r\n            <\/li>\r\n            <li>\r\n              Fewer effective current-sharing paths are available.\r\n            <\/li>\r\n            <li>\r\n              The consultant, tender or national rule explicitly requires\r\n              25kA.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <h3>Does every building with an external LPS need 25kA?<\/h3>\r\n\r\n      <p>\r\n        No. An external lightning protection system means Type 1 protection\r\n        normally needs to be considered at the origin, but it does not\r\n        automatically determine the Iimp rating. An LPL III or IV project\r\n        may use 12.5kA where the calculation supports it. LPL I or II\r\n        commonly leads to a 25kA product selection.\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-4\" aria-label=\"Reference 4\">[4]<\/a>\r\n        <\/sup>\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-5\" aria-label=\"Reference 5\">[5]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <h3>What about high-lightning and industrial sites?<\/h3>\r\n\r\n      <p>\r\n        High lightning activity increases the probability of an event, but\r\n        it does not by itself produce one fixed Iimp value. Industrial\r\n        incomers, hospitals, telecom facilities, hazardous sites and other\r\n        critical installations often justify the higher rating because of\r\n        the LPL, current-distribution result or consequence of failure\u2014not\r\n        simply because they are \u201cindustrial.\u201d\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-critical\">\r\n        <strong>Iimp is not the short-circuit rating.<\/strong>\r\n        Industrial buyers must separately verify the prospective\r\n        short-circuit current, required backup fuse or breaker, and the\r\n        follow-current extinguishing capability of spark-gap-based SPDs.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"per-pole-total\" aria-labelledby=\"per-pole-heading\">\r\n      <h2 id=\"per-pole-heading\"><span class=\"ez-toc-section\" id=\"do-not-confuse-per-path-iimp-with-itotal\"><\/span>\r\n        Do Not Confuse Per-Path Iimp with Itotal\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Type 1 SPD quotations often place several large kA values in the\r\n        same table. They may describe different protection modes and must\r\n        not be treated as interchangeable.\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-two-col\">\r\n        <div class=\"ly-iimp-panel\">\r\n          <h3>Iimp for one path or mode<\/h3>\r\n\r\n          <p>\r\n            This is the impulse current through a declared protection path,\r\n            such as L\u2013N, L\u2013PE, N\u2013PE or L\u2013PEN.\r\n          <\/p>\r\n\r\n          <p>\r\n            A product described as \u201c12.5kA per pole\u201d does not automatically\r\n            prove that every protection mode has the same value.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-panel\">\r\n          <h3>Itotal for the arrangement<\/h3>\r\n\r\n          <p>\r\n            Itotal is a separate declaration for the complete multipole\r\n            SPD or tested arrangement.\r\n          <\/p>\r\n\r\n          <p>\r\n            It must be taken from the manufacturer\u2019s verified data\u2014not\r\n            created by multiplying the number of modules.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-iimp-warning\">\r\n        <strong>Do not automatically calculate 4 \u00d7 12.5kA = 50kA Itotal.<\/strong>\r\n        That value is valid only when it is declared for the tested\r\n        complete arrangement.\r\n      <\/div>\r\n\r\n      <h3>Why 3+1 products need special attention<\/h3>\r\n\r\n      <p>\r\n        In a 3+1 SPD, the L\u2013N protection paths and the N\u2013PE path may have\r\n        different Iimp values. Manufacturer data may separately state\r\n        Iimp for L\u2013N, Iimp for N\u2013PE and Itotal for the complete\r\n        configuration.\r\n        <sup class=\"ly-iimp-citation\">\r\n          <a href=\"#ref-8\" aria-label=\"Reference 8\">[8]<\/a>\r\n        <\/sup>\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-success\">\r\n        <strong>Correct comparison rule:<\/strong>\r\n        compare the same waveform, the same protection mode, the same\r\n        system topology and the same complete-SPD declaration.\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      id=\"selection-process\"\r\n      aria-labelledby=\"selection-process-heading\"\r\n    >\r\n      <h2 id=\"selection-process-heading\"><span class=\"ez-toc-section\" id=\"practical-type-1-spd-iimp-selection-process\"><\/span>\r\n        Practical Type 1 SPD Iimp Selection Process\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-steps\">\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Confirm why Type 1 protection is required<\/strong>\r\n          <p>\r\n            Identify the external LPS, direct-lightning-current exposure,\r\n            overhead supply, tender specification or local rule.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Obtain the LPL or formal design requirement<\/strong>\r\n          <p>\r\n            Do not ask the SPD supplier to infer the LPL from the building\r\n            name or industry alone.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Determine the expected current sharing<\/strong>\r\n          <p>\r\n            Consider the incoming power conductors, bonded services,\r\n            cable shields, earthing arrangement and possible unequal\r\n            distribution.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Identify every required protection mode<\/strong>\r\n          <p>\r\n            Confirm whether the system uses 1+1, 3+1, 4+0, L\u2013N, L\u2013PE,\r\n            N\u2013PE or L\u2013PEN protection.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Select the next adequate certified rating<\/strong>\r\n          <p>\r\n            Use 12.5kA when the requirement is no higher than 12.5kA.\r\n            Use 25kA when the requirement is above 12.5kA and no higher\r\n            than 25kA.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Check the remaining SPD parameters<\/strong>\r\n          <p>\r\n            Verify Uc, Up, In, Imax, TOV behaviour, short-circuit rating,\r\n            follow current, backup protection and conductor requirements.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-step\">\r\n          <strong>Match the ordered model to the certificate<\/strong>\r\n          <p>\r\n            Confirm that the exact voltage, topology, poles and model code\r\n            appear within the certificate or verified test-report scope.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      id=\"purchasing-checklist\"\r\n      aria-labelledby=\"purchasing-heading\"\r\n    >\r\n      <h2 id=\"purchasing-heading\"><span class=\"ez-toc-section\" id=\"type-12-spd-bulk-purchasing-checklist\"><\/span>\r\n        Type 1+2 SPD Bulk-Purchasing Checklist\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        For panel projects, distributor stock and OEM orders, the purchase\r\n        order should specify more than \u201cType 1+2, 25kA.\u201d\r\n      <\/p>\r\n\r\n      <ul class=\"ly-iimp-checklist\">\r\n        <li>Type 1 or Type 1+2 classification<\/li>\r\n        <li>Applicable IEC or EN standard edition<\/li>\r\n        <li>Iimp value at 10\/350 \u03bcs<\/li>\r\n        <li>Protection path or mode covered by Iimp<\/li>\r\n        <li>Declared Itotal for the complete SPD<\/li>\r\n        <li>System voltage and Uc\/MCOV<\/li>\r\n        <li>Voltage protection level Up<\/li>\r\n        <li>In and Imax at 8\/20 \u03bcs<\/li>\r\n        <li>TN-C, TN-S, TN-C-S, TT or IT system<\/li>\r\n        <li>1+1, 3+1, 4+0 or other topology<\/li>\r\n        <li>L\u2013N, L\u2013PE, N\u2013PE and L\u2013PEN ratings<\/li>\r\n        <li>Follow-current extinguishing capability<\/li>\r\n        <li>Short-circuit current rating or withstand<\/li>\r\n        <li>Maximum permitted backup protection<\/li>\r\n        <li>TOV behaviour and safe failure mode<\/li>\r\n        <li>Terminal size and tightening torque<\/li>\r\n        <li>Pluggable or monoblock construction<\/li>\r\n        <li>Visual indicator and remote alarm contact<\/li>\r\n        <li>Exact model coverage in certification<\/li>\r\n        <li>OEM label, packaging, MOQ and lead time<\/li>\r\n      <\/ul>\r\n\r\n      <div class=\"ly-iimp-inline-links\">\r\n        <h3>Parameters that need separate confirmation<\/h3>\r\n\r\n        <p>\r\n          Iimp does not replace\r\n          <a\r\n            href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener\"\r\n          >Uc selection<\/a>,\r\n          <a\r\n            href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener\"\r\n          >Up selection<\/a>,\r\n          <a\r\n            href=\"https:\/\/www.cnspd.com\/spd-in-rating-selection\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener\"\r\n          >In rating<\/a>\r\n          or\r\n          <a\r\n            href=\"https:\/\/www.cnspd.com\/spd-imax-selection\/\"\r\n            target=\"_blank\"\r\n            rel=\"noopener\"\r\n          >Imax selection<\/a>.\r\n          Each parameter answers a different engineering question.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-iimp-table-wrap\">\r\n        <table class=\"ly-iimp-table\">\r\n          <thead>\r\n            <tr>\r\n              <th scope=\"col\">Parameter<\/th>\r\n              <th scope=\"col\">What the supplier should state<\/th>\r\n              <th scope=\"col\">Warning sign<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <th scope=\"row\">Iimp<\/th>\r\n              <td>\r\n                Value, 10\/350 \u03bcs waveform and exact protection mode\r\n              <\/td>\r\n              <td>\r\n                Only \u201c25kA SPD\u201d with no waveform or mode\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Itotal<\/th>\r\n              <td>\r\n                Verified value for the complete configuration\r\n              <\/td>\r\n              <td>\r\n                Total created by informal multiplication\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Type declaration<\/th>\r\n              <td>\r\n                Type 1 or Type 1+2 under the applicable standard\r\n              <\/td>\r\n              <td>\r\n                \u201cT1+T2\u201d used only as marketing text\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Certificate<\/th>\r\n              <td>\r\n                Certificate holder, exact model family and parameter scope\r\n              <\/td>\r\n              <td>\r\n                Certificate belongs to another model or manufacturer\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Network system<\/th>\r\n              <td>\r\n                Approved topology for TN, TT or IT use\r\n              <\/td>\r\n              <td>\r\n                The same configuration is offered for every system\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Backup protection<\/th>\r\n              <td>\r\n                Maximum fuse or breaker and coordination conditions\r\n              <\/td>\r\n              <td>\r\n                No declared backup-protection requirement\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">Up<\/th>\r\n              <td>\r\n                Declared Up for the relevant modes\r\n              <\/td>\r\n              <td>\r\n                Higher Iimp is presented as proof of lower Up\r\n              <\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <th scope=\"row\">OEM approval<\/th>\r\n              <td>\r\n                Approved model, technical label, packaging and documents\r\n              <\/td>\r\n              <td>\r\n                Production begins before technical confirmation\r\n              <\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <p class=\"ly-iimp-scroll-hint\">\r\n        Swipe horizontally to view the complete table.\r\n      <\/p>\r\n\r\n      <div class=\"ly-iimp-rfq\">\r\n        <h3>Copy-and-send RFQ template<\/h3>\r\n\r\n        <p>\r\n          Send the following information to the SPD manufacturer to reduce\r\n          repeated clarification and incorrect quotations.\r\n        <\/p>\r\n\r\n        <div class=\"ly-iimp-rfq-copy\">Please quote a Type 1 \/ Type 1+2 SPD for the following project:\r\n\r\nSystem voltage:\r\nEarthing system: TN-C \/ TN-S \/ TN-C-S \/ TT \/ IT\r\nPhase configuration:\r\nRequired topology: 1+1 \/ 3+1 \/ 4+0 \/ other\r\nLightning Protection Level:\r\nRequired Iimp at 10\/350 \u03bcs:\r\nProtection mode or path covered by Iimp:\r\nRequired Itotal:\r\nRequired Uc:\r\nMaximum acceptable Up:\r\nRequired In \/ Imax at 8\/20 \u03bcs:\r\nProspective short-circuit current:\r\nPreferred backup fuse or breaker:\r\nRemote signalling contact required: Yes \/ No\r\nPluggable modules required: Yes \/ No\r\nRequired IEC \/ EN standard and certificate:\r\nOEM logo and technical label requirement:\r\nPackaging requirement:\r\nEstimated order quantity:\r\nTarget market:\r\nRequired delivery date:<\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"faq\" aria-labelledby=\"faq-heading\">\r\n      <h2 id=\"faq-heading\"><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>\r\n        Frequently Asked Questions\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-faq\">\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Is a 25kA Type 1 SPD always better than a 12.5kA model?\r\n          <\/h3>\r\n\r\n          <p>\r\n            It has a higher 10\/350 \u03bcs impulse-current capability, but it is\r\n            not automatically the better complete specification. Uc, Up,\r\n            topology, short-circuit conditions, backup protection and\r\n            certification must also match the project.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Can a 25kA SPD replace a 12.5kA SPD?\r\n          <\/h3>\r\n\r\n          <p>\r\n            It may provide adequate Iimp margin, but only when the voltage\r\n            rating, network system, protection modes, Up, follow-current\r\n            capability, backup protection, terminals and certification are\r\n            also suitable.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Why is LPL II normally matched with a 25kA SPD?\r\n          <\/h3>\r\n\r\n          <p>\r\n            A simplified four-path calculation gives 18.75kA per path.\r\n            Because 18.75kA is not a common product rating, the next higher\r\n            commercial rating is normally 25kA.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Does an external lightning protection system always require\r\n            25kA?\r\n          <\/h3>\r\n\r\n          <p>\r\n            No. LPL III or IV projects may use 12.5kA where supported by\r\n            the current-distribution design. LPL I or II commonly leads to\r\n            a 25kA selection.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Is Iimp 12.5kA the same as Imax 12.5kA?\r\n          <\/h3>\r\n\r\n          <p>\r\n            No. Iimp uses a 10\/350 \u03bcs waveform for Type 1 duty. Imax uses\r\n            an 8\/20 \u03bcs waveform for Type 2 duty. The current stresses are\r\n            different.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            Can I multiply per-pole Iimp by the number of poles?\r\n          <\/h3>\r\n\r\n          <p>\r\n            Not unless the manufacturer declares the resulting value as\r\n            Itotal for the tested complete configuration.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            What should be checked in a 3+1 Type 1+2 SPD?\r\n          <\/h3>\r\n\r\n          <p>\r\n            Check Iimp for the L\u2013N paths, Iimp for the N\u2013PE path, Itotal,\r\n            Uc, Up, follow-current behaviour, backup protection and\r\n            compatibility with the TT or TN-S system.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-iimp-faq-item\">\r\n          <h3>\r\n            What if the required Iimp exceeds 25kA?\r\n          <\/h3>\r\n\r\n          <p>\r\n            Review a higher-rated dedicated Type 1 solution and the\r\n            complete lightning-protection architecture. Do not use a 25kA\r\n            product beyond its declared and certified duty.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-iimp-related\"\r\n      aria-labelledby=\"related-heading\"\r\n    >\r\n      <h2 id=\"related-heading\"><span class=\"ez-toc-section\" id=\"related-spd-selection-guides\"><\/span>Related SPD Selection Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-iimp-related-grid\">\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/spd-selection-guide\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">General selection<\/span>\r\n          <strong>SPD Selection Guide<\/strong>\r\n          <small>\r\n            Compare voltage, current, topology and installation parameters.\r\n          <\/small>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">Protection level<\/span>\r\n          <strong>SPD Up Selection Guide<\/strong>\r\n          <small>\r\n            Understand voltage protection level and equipment withstand.\r\n          <\/small>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/tt-system-spd\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">Network topology<\/span>\r\n          <strong>TT System SPD Guide<\/strong>\r\n          <small>\r\n            Compare 3+1 and alternative protection arrangements.\r\n          <\/small>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/three-phase-spd-wiring-diagram\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">Panel engineering<\/span>\r\n          <strong>Three-Phase SPD Wiring<\/strong>\r\n          <small>\r\n            Review protection modes, conductors and installation layout.\r\n          <\/small>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/spd-certificate-verification\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">Supplier verification<\/span>\r\n          <strong>SPD Certificate Verification<\/strong>\r\n          <small>\r\n            Check whether certificates cover the ordered model and rating.\r\n          <\/small>\r\n        <\/a>\r\n\r\n        <a\r\n          class=\"ly-iimp-related-card\"\r\n          href=\"https:\/\/www.cnspd.com\/type-1-2-din-rail-surge-protector\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          <span class=\"ly-iimp-related-label\">Product category<\/span>\r\n          <strong>Type 1+2 DIN-Rail SPDs<\/strong>\r\n          <small>\r\n            Review available configurations for distribution boards.\r\n          <\/small>\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-iimp-cta\" aria-labelledby=\"cta-heading\">\r\n      <div class=\"ly-iimp-cta-grid\">\r\n        <div>\r\n          <h2 id=\"cta-heading\"><span class=\"ez-toc-section\" id=\"need-a-type-12-spd-specification-for-an-oem-order\"><\/span>\r\n            Need a Type 1+2 SPD Specification for an OEM Order?\r\n          <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            Send us the system voltage, earthing arrangement, topology,\r\n            LPL, required Iimp, Up, short-circuit conditions and target\r\n            market. LEEYEE can review the ordering parameters before\r\n            quotation and label approval.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <button\r\n          type=\"button\"\r\n          class=\"ly-iimp-btn leeyee-site-popup-btn\"\r\n          aria-label=\"Request a Type 1 SPD quotation\"\r\n        >\r\n          <span>Request a Type 1 SPD Quote<\/span>\r\n        <\/button>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section\r\n      class=\"ly-iimp-sources\"\r\n      aria-labelledby=\"sources-heading\"\r\n    >\r\n      <h2 id=\"sources-heading\"><span class=\"ez-toc-section\" id=\"technical-references\"><\/span>Technical References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ol>\r\n        <li id=\"ref-1\">\r\n          IEC 61643-11:2025, Low-voltage surge protective devices\r\n          connected to AC low-voltage power systems\u2014requirements and test\r\n          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            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-2\">\r\n          IEC 61643-12:2020, selection, operation, location and\r\n          coordination principles for SPDs connected to AC power circuits.\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            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-3\">\r\n          Electrical Installation Guide, Selection of a Type 1 SPD,\r\n          including the commonly referenced minimum Iimp of 12.5kA at\r\n          10\/350 \u03bcs per branch where no higher rule applies.\r\n          <a\r\n            href=\"https:\/\/www.electrical-installation.org\/enwiki\/Selection_of_a_Type_1_SPD\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View selection guide\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-4\">\r\n          Phoenix Contact, Type 1+2 surge protection portfolio and\r\n          application guidance for 12.5kA and 25kA ratings.\r\n          <a\r\n            href=\"https:\/\/www.phoenixcontact.com\/en-pc\/products\/surge-protection\/surge-protection-for-power-supplies\/type1-surge-protection\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical reference\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-5\">\r\n          Legrand, modular SPD technical documentation, including\r\n          12.5kA-per-pole guidance for LPL III\/IV applications.\r\n          <a\r\n            href=\"https:\/\/assets.legrand.com\/pim\/NP-FT-GT\/F02063EN-04.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View technical document\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-6\">\r\n          IEC 62305-1:2024, Protection against lightning\u2014general\r\n          principles and lightning-current parameters.\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/27136\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-7\">\r\n          IEC 62305-4:2024, surge protection measures for electrical and\r\n          electronic systems, including current-sharing considerations.\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            View IEC publication\r\n          <\/a>\r\n        <\/li>\r\n\r\n        <li id=\"ref-8\">\r\n          DEHNshield manufacturer data showing separate Iimp values for\r\n          L\u2013N and N\u2013PE modes and a separate Itotal declaration.\r\n          <a\r\n            href=\"https:\/\/www.dehn-international.com\/store\/p\/en-DE\/F42828\/dehnshield?product=P42838\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            View product technical data\r\n          <\/a>\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <p class=\"ly-iimp-source-note\">\r\n        National wiring rules, project specifications and the responsible\r\n        lightning-protection engineer\u2019s calculation take precedence over\r\n        general selection examples. Verify the latest product data and\r\n        certification scope before ordering.\r\n      <\/p>\r\n    <\/section>\r\n\r\n  <\/div>\r\n<\/article>\r\n\r\n<script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var popupButtons = document.querySelectorAll(\r\n      '.leeyee-site-popup-btn'\r\n    );\r\n\r\n    popupButtons.forEach(function (button) {\r\n      if (button.dataset.leeyeePopupBound === '1') {\r\n        return;\r\n      }\r\n\r\n      button.dataset.leeyeePopupBound = '1';\r\n\r\n      button.addEventListener('click', function (event) {\r\n        event.preventDefault();\r\n\r\n        var realPopupTrigger = document.querySelector(\r\n          '.w-popup.ush_popup_1 .w-popup-trigger'\r\n        );\r\n\r\n        if (realPopupTrigger) {\r\n          realPopupTrigger.click();\r\n        } else {\r\n          window.open(\r\n            'https:\/\/www.cnspd.com\/contact\/',\r\n            '_blank',\r\n            'noopener'\r\n          );\r\n        }\r\n      });\r\n    });\r\n  });\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"Article\",\r\n  \"headline\": \"SPD Iimp 12.5kA vs 25kA: Type 1 SPD Selection Guide\",\r\n  \"description\": \"Compare Iimp 12.5kA vs 25kA for Type 1 and Type 1+2 SPDs. Select by LPL, 10\/350 \u03bcs duty, current sharing, per-path rating and Itotal.\",\r\n  \"datePublished\": \"2026-07-14\",\r\n  \"dateModified\": \"2026-07-14\",\r\n  \"image\": [\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-iimp-12-5ka-vs-25ka-comparison.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/10-350-vs-8-20-spd-current-waveform.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/lpl-lightning-current-sharing-iimp-selection.webp\"\r\n  ],\r\n  \"author\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE SPD Engineering Team\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"reviewedBy\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE SPD Engineering Team\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"publisher\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/www.cnspd.com\/spd-iimp-12-5ka-vs-25ka\/\"\r\n  },\r\n  \"isPartOf\": {\r\n    \"@type\": \"WebSite\",\r\n    \"name\": \"CNSPD by LEEYEE\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"about\": [\r\n    \"Type 1 surge protective device\",\r\n    \"Type 1+2 surge protective device\",\r\n    \"Iimp 12.5kA\",\r\n    \"Iimp 25kA\",\r\n    \"10\/350 microsecond waveform\",\r\n    \"Lightning Protection Level\",\r\n    \"SPD Itotal\"\r\n  ],\r\n  \"citation\": [\r\n    \"https:\/\/webstore.iec.ch\/en\/publication\/65314\",\r\n    \"https:\/\/webstore.iec.ch\/en\/publication\/32531\",\r\n    \"https:\/\/webstore.iec.ch\/en\/publication\/27136\",\r\n    \"https:\/\/webstore.iec.ch\/en\/publication\/29590\"\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is a 25kA Type 1 SPD always better than a 12.5kA model?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A 25kA SPD has a higher 10\/350 microsecond impulse-current capability, but it is not automatically the better complete specification. Uc, Up, topology, short-circuit conditions, backup protection and certification must also match the project.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can a 25kA SPD replace a 12.5kA SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"It may provide adequate Iimp margin, but only when the voltage rating, network system, protection modes, Up, follow-current capability, backup protection, terminals and certification are also suitable.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Why is LPL II normally matched with a 25kA SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A simplified four-path calculation gives 18.75kA per path. Because 18.75kA is not a common product rating, the next higher commercial rating is normally 25kA.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does an external lightning protection system always require 25kA?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. LPL III or IV projects may use 12.5kA where supported by the current-distribution design. LPL I or II commonly leads to a 25kA selection.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is Iimp 12.5kA the same as Imax 12.5kA?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. Iimp uses a 10\/350 microsecond waveform for Type 1 duty. Imax uses an 8\/20 microsecond waveform for Type 2 duty. The current stresses are different.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can I multiply per-pole Iimp by the number of poles?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Not unless the manufacturer declares the resulting value as Itotal for the tested complete configuration.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What should be checked in a 3+1 Type 1+2 SPD?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Check Iimp for the L-N paths, Iimp for the N-PE path, Itotal, Uc, Up, follow-current behaviour, backup protection and compatibility with the TT or TN-S system.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What if the required Iimp exceeds 25kA?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Review a higher-rated dedicated Type 1 solution and the complete lightning-protection architecture. 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