{"id":30341,"date":"2026-07-22T16:51:46","date_gmt":"2026-07-22T08:51:46","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30341"},"modified":"2026-07-23T16:08:12","modified_gmt":"2026-07-23T08:08:12","slug":"ul-1449-vs-iec-61643-spd-standard-guide-for-global-buyers","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/ul-1449-vs-iec-61643-spd\/","title":{"rendered":"UL 1449 vs IEC 61643: Guia de Padr\u00e3o SPD para Compradores Globais"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30341\" class=\"elementor elementor-30341\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0ca0622 e-flex e-con-boxed e-con e-parent\" data-id=\"0ca0622\" 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-ff3cd9d elementor-widget elementor-widget-html\" data-id=\"ff3cd9d\" 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\/* =========================================================\r\n   LEEYEE ARTICLE\r\n   UL 1449 vs IEC 61643 SPD Standard Guide\r\n   WordPress \/ WPBakery Custom HTML\r\n   H1 is provided by the WordPress page title.\r\n========================================================= *\/\r\n\r\n#ly-ul-iec-article,\r\n#ly-ul-iec-article * {\r\n    box-sizing: border-box;\r\n}\r\n\r\n#ly-ul-iec-article {\r\n    --ly-blue: #004898;\r\n    --ly-blue-dark: #00366f;\r\n    --ly-blue-soft: #edf5fc;\r\n    --ly-blue-pale: #f7fafd;\r\n    --ly-orange: #df681d;\r\n    --ly-ink: #172333;\r\n    --ly-text: #35465a;\r\n    --ly-muted: #68788a;\r\n    --ly-line: #dce5ee;\r\n    --ly-line-dark: #c8d4df;\r\n    --ly-white: #ffffff;\r\n    --ly-shadow: 0 8px 24px rgba(19, 52, 84, 0.07);\r\n    --ly-radius: 14px;\r\n\r\n    width: 100%;\r\n    margin: 0;\r\n    padding: 0;\r\n    overflow: hidden;\r\n    color: var(--ly-text);\r\n    background: var(--ly-white);\r\n    font-family: Arial, Helvetica, 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-ul-iec-article * {\r\n    min-width: 0;\r\n}\r\n\r\n#ly-ul-iec-article img {\r\n    display: block;\r\n    max-width: 100%;\r\n    height: auto;\r\n}\r\n\r\n#ly-ul-iec-article a {\r\n    color: var(--ly-blue);\r\n    text-decoration: none;\r\n}\r\n\r\n#ly-ul-iec-article a:hover,\r\n#ly-ul-iec-article a:focus {\r\n    color: var(--ly-blue-dark);\r\n    text-decoration: underline;\r\n}\r\n\r\n#ly-ul-iec-article p,\r\n#ly-ul-iec-article li,\r\n#ly-ul-iec-article td,\r\n#ly-ul-iec-article th {\r\n    overflow-wrap: anywhere;\r\n}\r\n\r\n#ly-ul-iec-article p {\r\n    margin: 0 0 18px;\r\n}\r\n\r\n#ly-ul-iec-article ul,\r\n#ly-ul-iec-article ol {\r\n    margin: 0;\r\n    padding-left: 23px;\r\n}\r\n\r\n#ly-ul-iec-article li {\r\n    margin-bottom: 8px;\r\n}\r\n\r\n#ly-ul-iec-article strong {\r\n    color: var(--ly-ink);\r\n}\r\n\r\n#ly-ul-iec-article h2,\r\n#ly-ul-iec-article h3,\r\n#ly-ul-iec-article h4 {\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n    line-height: 1.24;\r\n    letter-spacing: -0.018em;\r\n}\r\n\r\n#ly-ul-iec-article h2 {\r\n    margin: 0 0 20px;\r\n    font-size: 32px;\r\n}\r\n\r\n#ly-ul-iec-article h3 {\r\n    margin: 0 0 12px;\r\n    font-size: 23px;\r\n}\r\n\r\n#ly-ul-iec-article h4 {\r\n    margin: 0 0 9px;\r\n    font-size: 18px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-article-width {\r\n    width: min(920px, calc(100% - 48px));\r\n    margin-right: auto;\r\n    margin-left: auto;\r\n}\r\n\r\n#ly-ul-iec-article .ly-wide {\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-ul-iec-article .ly-section {\r\n    padding: 68px 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-section + .ly-section {\r\n    border-top: 1px solid #edf1f5;\r\n}\r\n\r\n#ly-ul-iec-article .ly-section--soft {\r\n    background: var(--ly-blue-pale);\r\n}\r\n\r\n#ly-ul-iec-article .ly-section-label {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    gap: 8px;\r\n    margin-bottom: 13px;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    line-height: 1.3;\r\n    letter-spacing: 0.09em;\r\n    text-transform: uppercase;\r\n}\r\n\r\n#ly-ul-iec-article .ly-section-label::before {\r\n    width: 25px;\r\n    height: 3px;\r\n    border-radius: 999px;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n}\r\n\r\n#ly-ul-iec-article .ly-section-intro {\r\n    max-width: 790px;\r\n    margin-bottom: 30px;\r\n    color: var(--ly-muted);\r\n    font-size: 18px;\r\n}\r\n\r\n\/* Article introduction *\/\r\n#ly-ul-iec-article .ly-article-intro {\r\n    padding: 20px 0 30px;\r\n    background: var(--ly-white);\r\n}\r\n\r\n#ly-ul-iec-article .ly-intro-label {\r\n    margin-bottom: 12px;\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.07em;\r\n    text-transform: uppercase;\r\n}\r\n\r\n#ly-ul-iec-article .ly-lead {\r\n    max-width: 820px;\r\n    margin-bottom: 14px;\r\n    color: var(--ly-muted);\r\n    font-size: 18px;\r\n    line-height: 1.67;\r\n}\r\n\r\n#ly-ul-iec-article .ly-meta {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 7px 22px;\r\n    margin-top: 20px;\r\n    padding-top: 14px;\r\n    border-top: 1px solid var(--ly-line);\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.5;\r\n}\r\n\r\n#ly-ul-iec-article .ly-meta strong {\r\n    color: var(--ly-text);\r\n}\r\n\r\n\/* Quick answer *\/\r\n#ly-ul-iec-article .ly-quick-answer {\r\n    margin-top: 26px;\r\n    padding: 25px 27px;\r\n    border: 1px solid #bfd3e5;\r\n    border-left: 5px solid var(--ly-blue);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-blue-soft);\r\n}\r\n\r\n#ly-ul-iec-article .ly-quick-answer-label {\r\n    display: block;\r\n    margin-bottom: 8px;\r\n    color: var(--ly-blue);\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-ul-iec-article .ly-quick-answer p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* Table of contents *\/\r\n#ly-ul-iec-article .ly-toc {\r\n    margin-top: 24px;\r\n    padding: 23px 25px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-white);\r\n}\r\n\r\n#ly-ul-iec-article .ly-toc h2 {\r\n    margin-bottom: 14px;\r\n    font-size: 21px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-toc-list {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 7px 26px;\r\n    margin: 0;\r\n    padding-left: 20px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-toc-list li {\r\n    margin: 0;\r\n    padding-left: 2px;\r\n    color: var(--ly-blue);\r\n    font-size: 15px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-toc-list a {\r\n    font-weight: 700;\r\n}\r\n\r\n\/* Summary facts *\/\r\n#ly-ul-iec-article .ly-summary-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 15px;\r\n    margin-top: 28px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-summary-item {\r\n    padding: 18px 19px;\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-ul-iec-article .ly-summary-item span {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.06em;\r\n    text-transform: uppercase;\r\n}\r\n\r\n#ly-ul-iec-article .ly-summary-item strong {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    font-size: 17px;\r\n}\r\n\r\n\/* Standard article blocks *\/\r\n#ly-ul-iec-article .ly-callout {\r\n    margin: 28px 0;\r\n    padding: 21px 23px;\r\n    border: 1px solid #efc9ab;\r\n    border-left: 5px solid var(--ly-orange);\r\n    border-radius: 11px;\r\n    color: #70401a;\r\n    background: #fff8f2;\r\n}\r\n\r\n#ly-ul-iec-article .ly-callout strong {\r\n    color: #70401a;\r\n}\r\n\r\n#ly-ul-iec-article .ly-note {\r\n    margin: 24px 0;\r\n    padding: 19px 21px;\r\n    border: 1px solid #c7daea;\r\n    border-radius: 11px;\r\n    background: var(--ly-blue-soft);\r\n}\r\n\r\n#ly-ul-iec-article .ly-note p:last-child,\r\n#ly-ul-iec-article .ly-callout p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-two-columns {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 22px;\r\n    margin-top: 28px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-text-panel {\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-white);\r\n}\r\n\r\n#ly-ul-iec-article .ly-text-panel p:last-child,\r\n#ly-ul-iec-article .ly-text-panel ul:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* Figures *\/\r\n#ly-ul-iec-article .ly-figure {\r\n    margin: 34px auto 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-figure-frame {\r\n    overflow: hidden;\r\n    border: 1px solid var(--ly-line-dark);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow);\r\n}\r\n\r\n#ly-ul-iec-article .ly-figure img {\r\n    width: 100%;\r\n}\r\n\r\n#ly-ul-iec-article .ly-figure figcaption {\r\n    padding: 12px 10px 0;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n    text-align: center;\r\n}\r\n\r\n\/* Desktop table *\/\r\n#ly-ul-iec-article .ly-table-wrap {\r\n    position: relative;\r\n    max-height: min(610px, 75vh);\r\n    overflow: auto;\r\n    margin-top: 27px;\r\n    border: 1px solid var(--ly-line-dark);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-white);\r\n    box-shadow: var(--ly-shadow);\r\n    scrollbar-width: thin;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table {\r\n    width: 100%;\r\n    min-width: 880px;\r\n    border-collapse: separate;\r\n    border-spacing: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table th,\r\n#ly-ul-iec-article .ly-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-ul-iec-article .ly-table th:last-child,\r\n#ly-ul-iec-article .ly-table td:last-child {\r\n    border-right: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table tbody tr:last-child td {\r\n    border-bottom: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table thead th {\r\n    position: sticky;\r\n    top: 0;\r\n    z-index: 2;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n    line-height: 1.45;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table tbody tr:nth-child(even) td {\r\n    background: #f8fbfe;\r\n}\r\n\r\n#ly-ul-iec-article .ly-table-note {\r\n    margin-top: 12px;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n}\r\n\r\n\/* Standard list *\/\r\n#ly-ul-iec-article .ly-standard-list {\r\n    display: grid;\r\n    gap: 14px;\r\n    margin-top: 27px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-standard-row {\r\n    display: grid;\r\n    grid-template-columns: 190px minmax(0, 1fr);\r\n    gap: 22px;\r\n    align-items: start;\r\n    padding: 19px 20px;\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-ul-iec-article .ly-standard-code {\r\n    color: var(--ly-blue);\r\n    font-weight: 800;\r\n}\r\n\r\n#ly-ul-iec-article .ly-standard-copy p {\r\n    margin-bottom: 7px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-standard-copy p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* Parameter list *\/\r\n#ly-ul-iec-article .ly-parameter-list {\r\n    display: grid;\r\n    gap: 13px;\r\n    margin-top: 27px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-parameter-row {\r\n    display: grid;\r\n    grid-template-columns: 150px minmax(0, 1fr);\r\n    gap: 20px;\r\n    padding: 18px 20px;\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-ul-iec-article .ly-parameter-name {\r\n    color: var(--ly-blue);\r\n    font-weight: 800;\r\n}\r\n\r\n\/* Decision steps *\/\r\n#ly-ul-iec-article .ly-steps {\r\n    counter-reset: ly-step;\r\n    display: grid;\r\n    gap: 14px;\r\n    margin-top: 27px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-step {\r\n    position: relative;\r\n    padding: 19px 20px 19px 69px;\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-ul-iec-article .ly-step::before {\r\n    counter-increment: ly-step;\r\n    position: absolute;\r\n    top: 19px;\r\n    left: 20px;\r\n    display: inline-flex;\r\n    align-items: center;\r\n    justify-content: center;\r\n    width: 34px;\r\n    height: 34px;\r\n    border-radius: 50%;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    content: counter(ly-step);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n}\r\n\r\n#ly-ul-iec-article .ly-step h3 {\r\n    margin-bottom: 7px;\r\n    font-size: 19px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-step p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* Checklists *\/\r\n#ly-ul-iec-article .ly-check-columns {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 22px;\r\n    margin-top: 28px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-check-box {\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-white);\r\n}\r\n\r\n#ly-ul-iec-article .ly-check-box h3 {\r\n    padding-bottom: 12px;\r\n    border-bottom: 2px solid var(--ly-blue);\r\n}\r\n\r\n#ly-ul-iec-article .ly-check-list {\r\n    list-style: none;\r\n    padding-left: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-check-list li {\r\n    position: relative;\r\n    padding-left: 27px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-check-list li::before {\r\n    position: absolute;\r\n    top: 0.25em;\r\n    left: 0;\r\n    width: 17px;\r\n    height: 17px;\r\n    border-radius: 50%;\r\n    color: var(--ly-white);\r\n    background: var(--ly-blue);\r\n    content: \"\u2713\";\r\n    font-size: 10px;\r\n    font-weight: 800;\r\n    line-height: 17px;\r\n    text-align: center;\r\n}\r\n\r\n\/* LEEYEE proof *\/\r\n#ly-ul-iec-article .ly-proof {\r\n    margin-top: 28px;\r\n    padding: 25px 27px;\r\n    border: 1px solid #c7d9e8;\r\n    border-radius: var(--ly-radius);\r\n    background: var(--ly-blue-pale);\r\n}\r\n\r\n#ly-ul-iec-article .ly-proof-row {\r\n    display: grid;\r\n    grid-template-columns: 185px minmax(0, 1fr);\r\n    gap: 20px;\r\n    padding: 15px 0;\r\n    border-bottom: 1px solid var(--ly-line);\r\n}\r\n\r\n#ly-ul-iec-article .ly-proof-row:first-of-type {\r\n    padding-top: 5px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-proof-row:last-of-type {\r\n    padding-bottom: 5px;\r\n    border-bottom: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-proof-label {\r\n    color: var(--ly-blue);\r\n    font-weight: 800;\r\n}\r\n\r\n#ly-ul-iec-article .ly-proof-copy p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n#ly-ul-iec-article .ly-brand-line {\r\n    margin-top: 19px;\r\n    color: var(--ly-blue);\r\n    font-size: 19px;\r\n    font-weight: 800;\r\n}\r\n\r\n\/* Common mistakes *\/\r\n#ly-ul-iec-article .ly-mistakes {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 14px 22px;\r\n    margin-top: 27px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-mistake {\r\n    position: relative;\r\n    padding: 17px 18px 17px 47px;\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-ul-iec-article .ly-mistake::before {\r\n    position: absolute;\r\n    top: 18px;\r\n    left: 18px;\r\n    color: var(--ly-orange);\r\n    content: \"!\";\r\n    font-size: 18px;\r\n    font-weight: 900;\r\n}\r\n\r\n#ly-ul-iec-article .ly-mistake p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* FAQ *\/\r\n#ly-ul-iec-article .ly-faq-list {\r\n    display: grid;\r\n    gap: 11px;\r\n    margin-top: 26px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq {\r\n    overflow: hidden;\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-ul-iec-article .ly-faq summary {\r\n    position: relative;\r\n    padding: 18px 52px 18px 20px;\r\n    color: var(--ly-ink);\r\n    cursor: pointer;\r\n    font-size: 17px;\r\n    font-weight: 800;\r\n    line-height: 1.45;\r\n    list-style: none;\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq summary::-webkit-details-marker {\r\n    display: none;\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq summary::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: 18px;\r\n    width: 27px;\r\n    height: 27px;\r\n    border-radius: 50%;\r\n    color: var(--ly-blue);\r\n    background: var(--ly-blue-soft);\r\n    content: \"+\";\r\n    font-size: 18px;\r\n    line-height: 27px;\r\n    text-align: center;\r\n    transform: translateY(-50%);\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq[open] summary::after {\r\n    content: \"\u2212\";\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq-answer {\r\n    padding: 0 20px 19px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-faq-answer p:last-child {\r\n    margin-bottom: 0;\r\n}\r\n\r\n\/* Related reading *\/\r\n#ly-ul-iec-article .ly-related-list {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 12px 24px;\r\n    margin-top: 25px;\r\n}\r\n\r\n#ly-ul-iec-article .ly-related-item {\r\n    padding: 16px 17px;\r\n    border-left: 3px solid var(--ly-blue);\r\n    background: 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#ly-ul-iec-article .ly-check-columns,\r\n    #ly-ul-iec-article .ly-mistakes {\r\n        grid-template-columns: 1fr;\r\n    }\r\n}\r\n\r\n@media (max-width: 820px) {\r\n    #ly-ul-iec-article h2 {\r\n        font-size: 29px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-lead,\r\n    #ly-ul-iec-article .ly-section-intro {\r\n        font-size: 17px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-standard-row,\r\n    #ly-ul-iec-article .ly-parameter-row,\r\n    #ly-ul-iec-article .ly-proof-row {\r\n        grid-template-columns: 1fr;\r\n        gap: 6px;\r\n    }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n    #ly-ul-iec-article {\r\n        font-size: 16px;\r\n        line-height: 1.68;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 32px);\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-article-intro {\r\n        padding: 14px 0 24px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-section {\r\n        padding: 53px 0;\r\n    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0);\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table tbody {\r\n        display: grid;\r\n        gap: 13px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table tbody tr {\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);\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table td {\r\n        display: grid;\r\n        grid-template-columns: minmax(110px, 34%) minmax(0, 1fr);\r\n        gap: 13px;\r\n        padding: 13px 15px;\r\n        border-right: 0;\r\n        border-bottom: 1px solid var(--ly-line);\r\n        background: var(--ly-white) !important;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table td:last-child {\r\n        border-bottom: 0;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table td::before {\r\n        color: var(--ly-blue);\r\n        content: attr(data-label);\r\n        font-size: 11px;\r\n        font-weight: 800;\r\n        line-height: 1.45;\r\n        letter-spacing: 0.04em;\r\n        text-transform: uppercase;\r\n    }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 28px);\r\n    }\r\n\r\n    #ly-ul-iec-article h2 {\r\n        font-size: 27px;\r\n    }\r\n\r\n    #ly-ul-iec-article h3 {\r\n        font-size: 21px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-button,\r\n    #ly-ul-iec-article a.ly-button {\r\n        width: 100%;\r\n    }\r\n}\r\n\r\n@media (max-width: 540px) {\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 26px);\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-meta {\r\n        display: grid;\r\n        gap: 5px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-text-panel,\r\n    #ly-ul-iec-article .ly-check-box {\r\n        padding: 20px;\r\n    }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 24px);\r\n    }\r\n\r\n    #ly-ul-iec-article h2 {\r\n        font-size: 25px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-table td {\r\n        grid-template-columns: 1fr;\r\n        gap: 4px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-step {\r\n        padding: 18px 17px 18px 59px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-step::before {\r\n        left: 16px;\r\n    }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n    #ly-ul-iec-article .ly-section {\r\n        padding: 48px 0;\r\n    }\r\n}\r\n\r\n@media (max-width: 414px) {\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 22px);\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-quick-answer,\r\n    #ly-ul-iec-article .ly-toc,\r\n    #ly-ul-iec-article .ly-proof,\r\n    #ly-ul-iec-article .ly-light-cta {\r\n        padding: 19px;\r\n    }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n    #ly-ul-iec-article .ly-faq summary {\r\n        padding-right: 47px;\r\n        font-size: 16px;\r\n    }\r\n}\r\n\r\n@media (max-width: 375px) {\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 20px);\r\n    }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n    #ly-ul-iec-article .ly-section {\r\n        padding: 44px 0;\r\n    }\r\n}\r\n\r\n@media (max-width: 320px) {\r\n    #ly-ul-iec-article {\r\n        font-size: 15px;\r\n    }\r\n\r\n    #ly-ul-iec-article .ly-article-width,\r\n    #ly-ul-iec-article .ly-wide {\r\n        width: calc(100% - 16px);\r\n    }\r\n\r\n    #ly-ul-iec-article h2 {\r\n        font-size: 22px;\r\n    }\r\n}\r\n\r\n@media (prefers-reduced-motion: reduce) {\r\n    #ly-ul-iec-article *,\r\n    #ly-ul-iec-article *::before,\r\n    #ly-ul-iec-article *::after {\r\n        scroll-behavior: auto !important;\r\n        transition: none !important;\r\n    }\r\n}\r\n<\/style>\r\n\r\n<article id=\"ly-ul-iec-article\" lang=\"en\">\r\n\r\n    <!-- ARTICLE INTRODUCTION: NO H1 -->\r\n    <section class=\"ly-article-intro\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-intro-label\">SPD Standards Guide for Global Buyers<\/div>\r\n\r\n            <p class=\"ly-lead\">\r\n                UL 1449 and the IEC 61643 series both address surge protective devices, but they use\r\n                different classification, testing, rating and certification frameworks.\r\n            <\/p>\r\n\r\n            <p class=\"ly-lead\">\r\n                This guide helps importers, distributors, panel builders, engineering buyers and OEM customers\r\n                determine which standard and product documents should be required for a specific market or project.\r\n            <\/p>\r\n\r\n            <div class=\"ly-meta\">\r\n                <span>Updated: <strong>July 22, 2026<\/strong><\/span>\r\n                <span>Published by: <strong>LEEYEE Technical Team<\/strong><\/span>\r\n                <span>Technical review: <strong>Devin Ling, Electrical Engineer at LEEYEE<\/strong><\/span>\r\n                <span>Reading time: <strong>Approximately 12 minutes<\/strong><\/span>\r\n            <\/div>\r\n\r\n            <div class=\"ly-quick-answer\">\r\n                <span class=\"ly-quick-answer-label\">Quick Answer<\/span>\r\n\r\n                <p>\r\n                    <strong>UL 1449 and IEC 61643 are not interchangeable SPD standards.<\/strong>\r\n                <\/p>\r\n\r\n                <p>\r\n                    UL 1449 is primarily used for SPD certification in the United States. The IEC 61643\r\n                    series is used in many IEC-based markets and international projects.\r\n                <\/p>\r\n\r\n                <p>\r\n                    A UL Type 2 SPD is not automatically equivalent to an IEC Type 2 SPD. Likewise, MCOV\r\n                    should not be treated as a direct replacement for Uc, and VPR should not be converted\r\n                    mechanically to Up.\r\n                <\/p>\r\n\r\n                <p>\r\n                    Buyers should approve an SPD only after checking the destination market, project\r\n                    specification, installation application, exact model and certificate scope.\r\n                <\/p>\r\n            <\/div>\r\n\r\n            <nav class=\"ly-toc\" aria-labelledby=\"ly-toc-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\/pt\/ul-1449-vs-iec-61643-spd\/#contents\" >Contents<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#what-is-the-main-difference-between-ul-1449-and-iec-61643\" >What is the main difference between UL 1449 and IEC 61643?<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#iec-61643-is-a-standards-series-not-one-universal-spd-standard\" >IEC 61643 is a standards series, not one universal SPD standard<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#why-ul-type-and-iec-type-must-not-be-treated-as-direct-equivalents\" >Why UL Type and IEC Type must not be treated as direct equivalents<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#mcov-vs-uc-vpr-vs-up-and-other-ratings-buyers-must-understand\" >MCOV vs Uc, VPR vs Up and other ratings buyers must understand<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#which-spd-standard-should-your-project-require\" >Which SPD standard should your project require?<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#how-should-buyers-verify-an-spd-certificate\" >How should buyers verify an SPD certificate?<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#how-leeyee-applies-these-rules-to-real-spd-procurement\" >How LEEYEE applies these rules to real SPD procurement<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#common-ul-and-iec-spd-procurement-mistakes\" >Common UL and IEC SPD procurement mistakes<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#ul-1449-vs-iec-61643-faq\" >UL 1449 vs IEC 61643 FAQ<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#continue-your-spd-specification-review\" >Continue your SPD specification review<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#references\" >References<\/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\/pt\/ul-1449-vs-iec-61643-spd\/#need-help-reviewing-an-iec-based-spd-requirement\" >Need help reviewing an IEC-based SPD requirement?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"ly-toc-heading\"><span class=\"ez-toc-section\" id=\"contents\"><\/span>Contents<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n                <ol class=\"ly-toc-list\">\r\n                    <li><a href=\"#ly-main-difference\">Main differences<\/a><\/li>\r\n                    <li><a href=\"#ly-iec-series\">IEC 61643 standards series<\/a><\/li>\r\n                    <li><a href=\"#ly-type-comparison\">UL Type vs IEC Type<\/a><\/li>\r\n                    <li><a href=\"#ly-rating-comparison\">MCOV, Uc, VPR and Up<\/a><\/li>\r\n                    <li><a href=\"#ly-market-selection\">Which standard should buyers require?<\/a><\/li>\r\n                    <li><a href=\"#ly-certificate-check\">Certificate verification<\/a><\/li>\r\n                    <li><a href=\"#ly-leeyee-support\">How LEEYEE supports IEC projects<\/a><\/li>\r\n                    <li><a href=\"#ly-common-mistakes\">Common procurement mistakes<\/a><\/li>\r\n                    <li><a href=\"#ly-faq\">FAQ<\/a><\/li>\r\n                    <li><a href=\"#ly-references\">References<\/a><\/li>\r\n                <\/ol>\r\n            <\/nav>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- MAIN DIFFERENCE -->\r\n    <section id=\"ly-main-difference\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Core comparison<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"what-is-the-main-difference-between-ul-1449-and-iec-61643\"><\/span>What is the main difference between UL 1449 and IEC 61643?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                The two frameworks address similar surge protection risks, but they do not classify,\r\n                test or certify products in exactly the same way.\r\n            <\/p>\r\n\r\n            <p>\r\n                UL 1449 is part of the U.S. product safety and certification system. Buyers normally\r\n                verify an exact product through its official UL certification record.\r\n            <\/p>\r\n\r\n            <p>\r\n                The IEC 61643 series provides international product requirements for different SPD\r\n                applications, including AC power, photovoltaic DC, other DC power and signal networks.\r\n            <\/p>\r\n\r\n            <div class=\"ly-summary-grid\">\r\n                <div class=\"ly-summary-item\">\r\n                    <span>United States<\/span>\r\n                    <strong>UL 1449<\/strong>\r\n                    <p>Verify the exact UL-certified model and its published ratings.<\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-summary-item\">\r\n                    <span>Canada<\/span>\r\n                    <strong>CSA C22.2 No. 269 series<\/strong>\r\n                    <p>Confirm the Canadian certification scope rather than assuming a U.S. listing is sufficient.<\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-summary-item\">\r\n                    <span>IEC-based markets<\/span>\r\n                    <strong>IEC 61643 series<\/strong>\r\n                    <p>Use the application-specific standard part and confirm national requirements.<\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-summary-item\">\r\n                    <span>Approval principle<\/span>\r\n                    <strong>Check the exact model<\/strong>\r\n                    <p>A standard name on a catalogue page is not complete certification evidence.<\/p>\r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-wide\">\r\n            <div class=\"ly-table-wrap\"\r\n                 role=\"region\"\r\n                 aria-label=\"UL 1449 and IEC 61643 comparison table\"\r\n                 tabindex=\"0\">\r\n                <table class=\"ly-table\">\r\n                    <thead>\r\n                        <tr>\r\n                            <th scope=\"col\">Buyer question<\/th>\r\n                            <th scope=\"col\">UL 1449 framework<\/th>\r\n                            <th scope=\"col\">IEC 61643 framework<\/th>\r\n                            <th scope=\"col\">Procurement rule<\/th>\r\n                        <\/tr>\r\n                    <\/thead>\r\n\r\n                    <tbody>\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Primary market context<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                Primarily used for U.S. SPD product certification.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                Used in many IEC-based countries and international projects.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Check the final installation country and written project requirements.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Standard structure<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                A product certification framework covering complete SPDs, assemblies and components.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                A standards series with common and application-specific requirements.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Request the complete standard number and edition.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Type classification<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                Connected to the UL product category, installation position and certification conditions.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                Connected to defined test duties, surge waveforms and coordinated applications.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Do not approve an SPD from the Type number alone.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Continuous operating voltage<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">MCOV<\/td>\r\n                            <td data-label=\"IEC 61643 framework\">Uc or Ucpv<\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Check the voltage, circuit mode and system configuration.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Voltage limitation<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">VPR<\/td>\r\n                            <td data-label=\"IEC 61643 framework\">Up<\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Do not use a fixed VPR-to-Up conversion.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Surge current ratings<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                May include In and other product-specific values.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                May include In, Imax and Iimp according to the SPD Type.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Compare each rating within its own standard test programme.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Short-circuit performance<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                SCCR is an important certification value.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                Review short-circuit behaviour, disconnection and backup protection.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                Confirm compatibility with the available fault current.\r\n                            <\/td>\r\n                        <\/tr>\r\n\r\n                        <tr>\r\n                            <td data-label=\"Buyer question\"><strong>Evidence to verify<\/strong><\/td>\r\n                            <td data-label=\"UL 1449 framework\">\r\n                                Official record, exact model, Type, modes and certified ratings.\r\n                            <\/td>\r\n                            <td data-label=\"IEC 61643 framework\">\r\n                                Certificate, annex, report, standard edition and declared ratings.\r\n                            <\/td>\r\n                            <td data-label=\"Procurement rule\">\r\n                                A datasheet statement alone is not enough.\r\n                            <\/td>\r\n                        <\/tr>\r\n                    <\/tbody>\r\n                <\/table>\r\n            <\/div>\r\n\r\n            <p class=\"ly-table-note\">\r\n                This table is a procurement orientation tool. It is not a UL-to-IEC certification conversion table.\r\n            <\/p>\r\n\r\n            <figure class=\"ly-figure\">\r\n                <div class=\"ly-figure-frame\">\r\n                    <img\r\n                        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ul-1449-vs-iec-61643-standard-scope-map.webp\"\r\n                        alt=\"UL 1449 vs IEC 61643 standard scope map for SPD buyers\"\r\n                        loading=\"lazy\"\r\n                        decoding=\"async\"\r\n                    >\r\n                <\/div>\r\n\r\n                <figcaption>\r\n                    UL 1449 and the IEC 61643 series cover similar surge protection risks through different\r\n                    market, classification and certification frameworks.\r\n                <\/figcaption>\r\n            <\/figure>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- IEC SERIES -->\r\n    <section id=\"ly-iec-series\" class=\"ly-section ly-section--soft\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">IEC standard scope<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"iec-61643-is-a-standards-series-not-one-universal-spd-standard\"><\/span>IEC 61643 is a standards series, not one universal SPD standard<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                Buyers should not ask only whether a product complies with \u201cIEC 61643\u201d.\r\n            <\/p>\r\n\r\n            <p>\r\n                The quotation and product documents should identify the part that applies to the actual circuit.\r\n            <\/p>\r\n\r\n            <div class=\"ly-standard-list\">\r\n                <div class=\"ly-standard-row\">\r\n                    <div class=\"ly-standard-code\">IEC 61643-01:2024<\/div>\r\n                    <div class=\"ly-standard-copy\">\r\n                        <p><strong>Common SPD requirements and test methods.<\/strong><\/p>\r\n                        <p>\r\n                            Applies to SPDs connected to circuits or equipment rated up to 1,000 V AC\r\n                            or 1,500 V DC. It is used with relevant application-specific parts.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-standard-row\">\r\n                    <div class=\"ly-standard-code\">IEC 61643-11:2025<\/div>\r\n                    <div class=\"ly-standard-copy\">\r\n                        <p><strong>AC low-voltage power systems.<\/strong><\/p>\r\n                        <p>\r\n                            Applies to SPDs connected to AC power circuits and equipment rated up to 1,000 V RMS.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-standard-row\">\r\n                    <div class=\"ly-standard-code\">IEC 61643-31:2018<\/div>\r\n                    <div class=\"ly-standard-copy\">\r\n                        <p><strong>Photovoltaic DC installations.<\/strong><\/p>\r\n                        <p>\r\n                            Applies to SPDs connected to the DC side of photovoltaic installations rated\r\n                            up to 1,500 V DC.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-standard-row\">\r\n                    <div class=\"ly-standard-code\">IEC 61643-41:2025<\/div>\r\n                    <div class=\"ly-standard-copy\">\r\n                        <p><strong>Non-PV DC power systems.<\/strong><\/p>\r\n                        <p>\r\n                            Applies to SPDs connected to other DC power circuits and equipment rated\r\n                            up to 1,500 V DC. PV applications remain under IEC 61643-31.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-standard-row\">\r\n                    <div class=\"ly-standard-code\">IEC 61643-21:2025<\/div>\r\n                    <div class=\"ly-standard-copy\">\r\n                        <p><strong>Telecommunications and signalling networks.<\/strong><\/p>\r\n                        <p>\r\n                            Applies to SPDs used on signal and communication lines, including lines that\r\n                            also carry power, such as Power over Ethernet.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-callout\">\r\n                <p>\r\n                    <strong>Buyer warning:<\/strong>\r\n                    an AC SPD certificate should not be used to approve a PV DC, non-PV DC or signal SPD.\r\n                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- TYPE COMPARISON -->\r\n    <section id=\"ly-type-comparison\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Classification boundary<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"why-ul-type-and-iec-type-must-not-be-treated-as-direct-equivalents\"><\/span>Why UL Type and IEC Type must not be treated as direct equivalents<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                UL and IEC both use Type numbers. This similarity can be misleading.\r\n            <\/p>\r\n\r\n            <p>\r\n                The Type number belongs to the classification logic of its own standard framework.\r\n            <\/p>\r\n\r\n            <div class=\"ly-two-columns\">\r\n                <div class=\"ly-text-panel\">\r\n                    <h3>UL Type classification<\/h3>\r\n\r\n                    <p>\r\n                        UL classification considers the product category, intended installation position\r\n                        and the conditions stated in the certification record.\r\n                    <\/p>\r\n\r\n                    <p>\r\n                        UL also distinguishes complete SPDs from component assemblies and discrete surge components.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-text-panel\">\r\n                    <h3>IEC Type classification<\/h3>\r\n\r\n                    <p>\r\n                        IEC Type classification is linked to defined test duties, surge waveforms and\r\n                        coordinated installation.\r\n                    <\/p>\r\n\r\n                    <p>\r\n                        Type 1 is associated with lightning impulse current testing. Type 2 is commonly\r\n                        associated with 8\/20 \u03bcs surge current testing.\r\n                    <\/p>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-callout\">\r\n                <p>\r\n                    <strong>Do not write \u201cUL Type 2 = IEC Type 2\u201d.<\/strong>\r\n                    The two products may have a similar application position, but this does not prove\r\n                    equivalent testing, certification or market acceptance.\r\n                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"ly-wide\">\r\n            <figure class=\"ly-figure\">\r\n                <div class=\"ly-figure-frame\">\r\n                    <img\r\n                        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ul-type-vs-iec-type-spd-classification-comparison.webp\"\r\n                        alt=\"UL Type vs IEC Type SPD classification comparison chart\"\r\n                        loading=\"lazy\"\r\n                        decoding=\"async\"\r\n                    >\r\n                <\/div>\r\n\r\n                <figcaption>\r\n                    Similar Type numbers do not establish identical approval, test conditions or permitted installation.\r\n                <\/figcaption>\r\n            <\/figure>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- RATINGS -->\r\n    <section id=\"ly-rating-comparison\" class=\"ly-section ly-section--soft\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Rating comparison<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"mcov-vs-uc-vpr-vs-up-and-other-ratings-buyers-must-understand\"><\/span>MCOV vs Uc, VPR vs Up and other ratings buyers must understand<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                The abbreviations used in UL and IEC documents may look comparable.\r\n            <\/p>\r\n\r\n            <p>\r\n                Buyers should compare their electrical purpose and test context, not only the letters or numbers.\r\n            <\/p>\r\n\r\n            <div class=\"ly-parameter-list\">\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">MCOV vs Uc<\/div>\r\n                    <div>\r\n                        Both values help determine whether the SPD can remain connected under normal system\r\n                        voltage. Check nominal voltage, circuit mode, network configuration and expected voltage variation.\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">VPR vs Up<\/div>\r\n                    <div>\r\n                        Both describe voltage limitation, but they are obtained under different standardised\r\n                        test conditions. Do not apply a fixed conversion ratio.\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">In<\/div>\r\n                    <div>\r\n                        Both frameworks may use the symbol In. The identical symbol does not mean that the\r\n                        complete test sequence and pass criteria are identical.\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">Imax<\/div>\r\n                    <div>\r\n                        In the IEC framework, Imax is commonly used for the maximum 8\/20 \u03bcs discharge\r\n                        current of a Type 2 SPD.\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">Iimp<\/div>\r\n                    <div>\r\n                        Iimp is an IEC Type 1 parameter commonly associated with the 10\/350 \u03bcs\r\n                        lightning impulse current waveform.\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-parameter-row\">\r\n                    <div class=\"ly-parameter-name\">SCCR<\/div>\r\n                    <div>\r\n                        SCCR is an important UL certification value. In an IEC project, review the declared\r\n                        short-circuit behaviour, disconnector arrangement and required backup protection.\r\n                    <\/div>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-note\">\r\n                <p>\r\n                    <strong>Example:<\/strong>\r\n                    an SPD with a high surge current value is not automatically suitable if its continuous\r\n                    operating voltage is incorrect or its certificate does not cover the quoted model.\r\n                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- STANDARD SELECTION -->\r\n    <section id=\"ly-market-selection\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Buyer decision process<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"which-spd-standard-should-your-project-require\"><\/span>Which SPD standard should your project require?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                Begin with the final project requirement rather than the supplier\u2019s preferred catalogue wording.\r\n            <\/p>\r\n\r\n            <div class=\"ly-steps\">\r\n                <div class=\"ly-step\">\r\n                    <h3>Identify the destination market<\/h3>\r\n                    <p>\r\n                        Confirm where the completed panel, inverter, cabinet or electrical system will be installed.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-step\">\r\n                    <h3>Read the written project specification<\/h3>\r\n                    <p>\r\n                        Look for UL, CSA, IEC, EN, CB Scheme, national certification or approved-vendor requirements.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-step\">\r\n                    <h3>Define the application<\/h3>\r\n                    <p>\r\n                        Confirm whether the SPD protects an AC power circuit, PV DC system, other DC circuit\r\n                        or signal line.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-step\">\r\n                    <h3>Confirm the installation position<\/h3>\r\n                    <p>\r\n                        Identify whether the SPD is installed at service equipment, a main distribution board,\r\n                        a sub-distribution board, an inverter, a combiner box or near protected equipment.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-step\">\r\n                    <h3>Verify the exact model<\/h3>\r\n                    <p>\r\n                        Match the quoted catalogue number with the certificate, annex, report, product marking\r\n                        and installation instructions.\r\n                    <\/p>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-callout\">\r\n                <p>\r\n                    <strong>Important:<\/strong>\r\n                    the buyer\u2019s office location does not decide the required standard. The final installation\r\n                    market and project approval rules are what matter.\r\n                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- CERTIFICATE CHECK -->\r\n    <section id=\"ly-certificate-check\" class=\"ly-section ly-section--soft\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Document verification<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"how-should-buyers-verify-an-spd-certificate\"><\/span>How should buyers verify an SPD certificate?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                A supplier statement such as \u201cdesigned according to UL\u201d or \u201ccomplies with IEC\u201d is not enough\r\n                for project approval.\r\n            <\/p>\r\n\r\n            <p>\r\n                The strongest evidence connects an exact product model to an active certification record,\r\n                certificate annex or technical report.\r\n            <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-wide\">\r\n            <figure class=\"ly-figure\">\r\n                <div class=\"ly-figure-frame\">\r\n                    <img\r\n                        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-certificate-verification-workflow-for-buyers.webp\"\r\n                        alt=\"SPD certificate verification workflow for buyers\"\r\n                        loading=\"lazy\"\r\n                        decoding=\"async\"\r\n                    >\r\n                <\/div>\r\n\r\n                <figcaption>\r\n                    Certificate verification workflow for importers, distributors, panel builders and OEM buyers.\r\n                <\/figcaption>\r\n            <\/figure>\r\n        <\/div>\r\n\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-check-columns\">\r\n                <div class=\"ly-check-box\">\r\n                    <h3>If UL or Canadian certification is required<\/h3>\r\n\r\n                    <ul class=\"ly-check-list\">\r\n                        <li>Certificate holder or manufacturer<\/li>\r\n                        <li>Exact catalogue number and suffix<\/li>\r\n                        <li>UL or CSA certification category<\/li>\r\n                        <li>Listed product or Recognized Component status<\/li>\r\n                        <li>Applicable standard and edition<\/li>\r\n                        <li>SPD Type<\/li>\r\n                        <li>System voltage and protection modes<\/li>\r\n                        <li>MCOV and VPR<\/li>\r\n                        <li>In and SCCR<\/li>\r\n                        <li>Environmental and enclosure conditions<\/li>\r\n                        <li>Required external protection<\/li>\r\n                        <li>Active official database record<\/li>\r\n                    <\/ul>\r\n                <\/div>\r\n\r\n                <div class=\"ly-check-box\">\r\n                    <h3>If IEC-based documentation is required<\/h3>\r\n\r\n                    <ul class=\"ly-check-list\">\r\n                        <li>Full IEC or EN standard number<\/li>\r\n                        <li>Edition, amendment and corrigendum<\/li>\r\n                        <li>Certificate holder<\/li>\r\n                        <li>Exact model or product-family scope<\/li>\r\n                        <li>Certificate annex<\/li>\r\n                        <li>CB Test Certificate where applicable<\/li>\r\n                        <li>CB Test Report or third-party report<\/li>\r\n                        <li>AC, PV DC, other DC or signal scope<\/li>\r\n                        <li>Uc or Ucpv<\/li>\r\n                        <li>Up, In, Imax or Iimp<\/li>\r\n                        <li>Pole configuration and modes<\/li>\r\n                        <li>Backup protection requirements<\/li>\r\n                    <\/ul>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-note\">\r\n                <p>\r\n                    <strong>CB certificates, CE marking and UL Listing are different forms of evidence.<\/strong>\r\n                    An IECEE CB Test Certificate may support national certification processes. CE marking is\r\n                    the manufacturer\u2019s declaration that applicable EU legal requirements have been met.\r\n                    Neither automatically replaces a specified UL or Canadian certification.\r\n                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- LEEYEE SUPPORT -->\r\n    <section id=\"ly-leeyee-support\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">IEC procurement support<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"how-leeyee-applies-these-rules-to-real-spd-procurement\"><\/span>How LEEYEE applies these rules to real SPD procurement<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                LEEYEE is a specialized surge protection and low-voltage protection supplier for solar PV,\r\n                power distribution, telecom, industrial and OEM applications.\r\n            <\/p>\r\n\r\n            <p>\r\n                CNSPD is LEEYEE\u2019s surge protection-focused platform for global buyers.\r\n            <\/p>\r\n\r\n            <p>\r\n                For an IEC-based order, LEEYEE reviews the product application before recommending a model\r\n                or document set.\r\n            <\/p>\r\n\r\n            <div class=\"ly-proof\">\r\n                <div class=\"ly-proof-row\">\r\n                    <div class=\"ly-proof-label\">AC Type 2 review<\/div>\r\n                    <div class=\"ly-proof-copy\">\r\n                        <p>\r\n                            For an AC distribution SPD in the LY1-C40 family, buyers should confirm the exact\r\n                            model, Uc, In, Imax, Up, pole arrangement, protection modes and current document scope.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-proof-row\">\r\n                    <div class=\"ly-proof-label\">AC Type 1+2 review<\/div>\r\n                    <div class=\"ly-proof-copy\">\r\n                        <p>\r\n                            For an IEC Type 1+2 application, LEEYEE reviews Uc, Iimp, In, Up, network\r\n                            configuration, installation position and the required backup protection.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-proof-row\">\r\n                    <div class=\"ly-proof-label\">PV DC review<\/div>\r\n                    <div class=\"ly-proof-copy\">\r\n                        <p>\r\n                            For an LY1-C40PV series application, buyers should confirm Ucpv, maximum array Voc,\r\n                            temperature conditions, In, Imax or Iimp, Up and the IEC 61643-31 document scope.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <div class=\"ly-proof-row\">\r\n                    <div class=\"ly-proof-label\">Document evidence<\/div>\r\n                    <div class=\"ly-proof-copy\">\r\n                        <p>\r\n                            Product pages and catalogues support initial selection. Final approval should use\r\n                            the current certificate, annex, test report and exact ordered catalogue number.\r\n                        <\/p>\r\n\r\n                        <p>\r\n                            Review available LEEYEE documentation on the\r\n                            <a href=\"https:\/\/www.cnspd.com\/patents-certificates\/\">certificates and patents page<\/a>.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-callout\">\r\n                <p>\r\n                    <strong>Certification boundary:<\/strong>\r\n                    LEEYEE does not present an IEC-based SPD as automatically equivalent to a UL Listed\r\n                    or Canadian-certified SPD.\r\n                <\/p>\r\n\r\n                <p>\r\n                    If a project specifically requires UL or Canadian certification, the exact product record\r\n                    must be verified before approval.\r\n                <\/p>\r\n            <\/div>\r\n\r\n            <p class=\"ly-brand-line\">Built to Protect. Trusted to Last.<\/p>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- COMMON MISTAKES -->\r\n    <section id=\"ly-common-mistakes\" class=\"ly-section ly-section--soft\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Risk control<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"common-ul-and-iec-spd-procurement-mistakes\"><\/span>Common UL and IEC SPD procurement mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <div class=\"ly-mistakes\">\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Assuming a UL Type 2 SPD is automatically equivalent to an IEC Type 2 SPD.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Approving a product family name without checking the exact model suffix.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Ignoring the certificate annex that lists included models and rating differences.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Converting VPR directly to Up through a fixed numerical ratio.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Using an AC SPD certificate to approve a photovoltaic DC product.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Treating CE marking as a third-party IEC product certificate.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Selecting an SPD only because it has the largest Imax value.\r\n                    <\/p>\r\n                <\/div>\r\n\r\n                <div class=\"ly-mistake\">\r\n                    <p>\r\n                        Assuming a U.S. UL Listing automatically satisfies Canadian certification requirements.\r\n                    <\/p>\r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- FAQ -->\r\n    <section id=\"ly-faq\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Buyer questions<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"ul-1449-vs-iec-61643-faq\"><\/span>UL 1449 vs IEC 61643 FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <div class=\"ly-faq-list\">\r\n                <details class=\"ly-faq\" open>\r\n                    <summary>Is an IEC Type 2 SPD the same as a UL Type 2 SPD?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            No. The two Type 2 classifications belong to different testing and certification\r\n                            frameworks. The exact standard, model, ratings and installation conditions must be verified.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Can an IEC 61643 SPD be described as UL Listed?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            Not from IEC testing alone. A UL Listing claim must be supported by an applicable\r\n                            official UL certification record covering the exact product model.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Is MCOV the same as Uc?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            They serve a similar product-selection purpose, but they belong to different\r\n                            standard frameworks. Check the voltage, circuit mode, network and certificate conditions.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Can VPR be converted directly to Up?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            No fixed conversion should be used. VPR and Up are determined under different\r\n                            standardised evaluation conditions.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Does UL 1449 automatically cover a Canadian project?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            No. Canadian projects may require an applicable CSA C22.2 No. 269 certification\r\n                            or a Canadian certification scope shown in the official product record.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Do CE marking or a CB certificate replace UL Listing?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            No. They serve different conformity purposes. Neither automatically replaces\r\n                            a project requirement for UL or Canadian product certification.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n\r\n                <details class=\"ly-faq\">\r\n                    <summary>Which IEC 61643 part applies to my SPD?<\/summary>\r\n                    <div class=\"ly-faq-answer\">\r\n                        <p>\r\n                            IEC 61643-11 applies to AC power SPDs, IEC 61643-31 to PV DC SPDs,\r\n                            IEC 61643-41 to other DC power SPDs and IEC 61643-21 to telecommunications\r\n                            and signalling SPDs.\r\n                        <\/p>\r\n                    <\/div>\r\n                <\/details>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- RELATED READING -->\r\n    <section class=\"ly-section ly-section--soft\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Related technical guides<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"continue-your-spd-specification-review\"><\/span>Continue your SPD specification review<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <div class=\"ly-related-list\">\r\n                <div class=\"ly-related-item\">\r\n                    <strong>IEC 61643-11 vs IEC 61643-31<\/strong>\r\n                    <p>Compare AC power and photovoltaic DC SPD product standards.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/iec-61643-11-vs-iec-61643-31\/\">Read the comparison<\/a>\r\n                <\/div>\r\n\r\n                <div class=\"ly-related-item\">\r\n                    <strong>SPD Certificate Verification<\/strong>\r\n                    <p>Check certificate holders, exact models, annexes and technical reports.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/spd-certificate-verification\/\">Review certificate checks<\/a>\r\n                <\/div>\r\n\r\n                <div class=\"ly-related-item\">\r\n                    <strong>SPD Uc Selection Guide<\/strong>\r\n                    <p>Select continuous operating voltage for AC distribution systems.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\">Choose the correct Uc<\/a>\r\n                <\/div>\r\n\r\n                <div class=\"ly-related-item\">\r\n                    <strong>PV SPD Ucpv Selection<\/strong>\r\n                    <p>Match PV SPD voltage to array Voc and temperature conditions.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/dc-spd-ucpv-selection\/\">Review Ucpv selection<\/a>\r\n                <\/div>\r\n\r\n                <div class=\"ly-related-item\">\r\n                    <strong>Complete SPD Selection Guide<\/strong>\r\n                    <p>Review network, voltage, SPD Type, surge ratings and protection level.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/spd-selection-guide\/\">Open the selection guide<\/a>\r\n                <\/div>\r\n\r\n                <div class=\"ly-related-item\">\r\n                    <strong>SPD Manufacturer in China<\/strong>\r\n                    <p>Evaluate factory capability, documents, engineering support and OEM control.<\/p>\r\n                    <a href=\"https:\/\/www.cnspd.com\/spd-manufacturer-china\/\">Evaluate an SPD supplier<\/a>\r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- REFERENCES -->\r\n    <section id=\"ly-references\" class=\"ly-section\">\r\n        <div class=\"ly-article-width\">\r\n            <div class=\"ly-section-label\">Authoritative sources<\/div>\r\n\r\n            <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n                Standards and certification requirements can change. Confirm the applicable edition,\r\n                national adoption and local project requirements when approving an order.\r\n            <\/p>\r\n\r\n            <ol class=\"ly-references\">\r\n                <li>\r\n                    International Electrotechnical Commission:\r\n                    <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IEC 61643-01:2024 \u2014 General requirements and test methods\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    International Electrotechnical Commission:\r\n                    <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IEC 61643-11:2025 \u2014 SPDs connected to AC low-voltage power systems\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    International Electrotechnical Commission:\r\n                    <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IEC 61643-31:2018 \u2014 SPDs for photovoltaic installations\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    International Electrotechnical Commission:\r\n                    <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IEC 61643-41:2025 \u2014 SPDs connected to DC low-voltage power systems\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    International Electrotechnical Commission:\r\n                    <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IEC 61643-21:2025 \u2014 Telecommunications and signalling network SPDs\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    UL Solutions:\r\n                    <a href=\"https:\/\/www.ul.com\/services\/surge-protection-device-testing-and-certification-services\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        Surge Protection Device Testing and Certification Services\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    UL Solutions:\r\n                    <a href=\"https:\/\/iq.ul.com\/\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        Product iQ certification database\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    CSA Group:\r\n                    <a href=\"https:\/\/www.csagroup.org\/store\/product\/C22.2%20NO.%20269.1-14\/\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        CSA C22.2 No. 269 series for surge protective devices\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    IECEE:\r\n                    <a href=\"https:\/\/www.iecee.org\/who-we-are\/cb-scheme\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        IECEE CB Scheme overview\r\n                    <\/a>.\r\n                <\/li>\r\n\r\n                <li>\r\n                    European Commission:\r\n                    <a href=\"https:\/\/single-market-economy.ec.europa.eu\/single-market\/goods\/ce-marking_en\"\r\n                       target=\"_blank\"\r\n                       rel=\"noopener noreferrer\">\r\n                        Official CE marking guidance\r\n                    <\/a>.\r\n                <\/li>\r\n            <\/ol>\r\n\r\n            <div class=\"ly-reference-note\">\r\n                This article is a procurement and specification guide. It does not replace the complete\r\n                standards, national regulations, electrical codes, project specifications or approval\r\n                by the relevant certification body or authority.\r\n            <\/div>\r\n\r\n            <div class=\"ly-light-cta\">\r\n                <h2><span class=\"ez-toc-section\" id=\"need-help-reviewing-an-iec-based-spd-requirement\"><\/span>Need help reviewing an IEC-based SPD requirement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n                <p>\r\n                    Send LEEYEE the destination market, application, system voltage, required SPD Type\r\n                    and document requirements. We can help identify the parameters and evidence that still\r\n                    need confirmation before quotation or sample approval.\r\n                <\/p>\r\n\r\n                <div class=\"ly-button-row\">\r\n                    <a class=\"ly-button leeyee-site-popup-btn\"\r\n                       href=\"javascript:void(0);\"\r\n                       role=\"button\">\r\n                        <span>Send Your SPD Requirement<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n        <\/div>\r\n    <\/section>\r\n\r\n    <!-- STRUCTURED DATA -->\r\n    <script type=\"application\/ld+json\">\r\n    {\r\n        \"@context\": \"https:\/\/schema.org\",\r\n        \"@graph\": [\r\n            {\r\n                \"@type\": \"Article\",\r\n                \"@id\": \"https:\/\/www.cnspd.com\/ul-1449-vs-iec-61643-spd\/#article\",\r\n                \"mainEntityOfPage\": {\r\n                    \"@type\": \"WebPage\",\r\n                    \"@id\": \"https:\/\/www.cnspd.com\/ul-1449-vs-iec-61643-spd\/\"\r\n                },\r\n                \"headline\": \"UL 1449 vs IEC 61643: SPD Standard Guide for Global Buyers\",\r\n                \"description\": \"Compare UL 1449 and IEC 61643 SPD standards, Type classifications, MCOV vs Uc, VPR vs Up, certificate scope and procurement checks.\",\r\n                \"author\": {\r\n                    \"@type\": \"Organization\",\r\n                    \"name\": \"LEEYEE Technical Team\"\r\n                },\r\n                \"reviewedBy\": {\r\n                    \"@type\": \"Person\",\r\n                    \"name\": \"Devin Ling\",\r\n                    \"jobTitle\": \"Electrical Engineer\",\r\n                    \"worksFor\": {\r\n                        \"@type\": \"Organization\",\r\n                        \"name\": \"LEEYEE\"\r\n                    }\r\n                },\r\n                \"publisher\": {\r\n                    \"@type\": \"Organization\",\r\n                    \"name\": \"LEEYEE\",\r\n                    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n                },\r\n                \"dateModified\": \"2026-07-22\",\r\n                \"image\": [\r\n                    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ul-1449-vs-iec-61643-standard-scope-map.webp\",\r\n                    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ul-type-vs-iec-type-spd-classification-comparison.webp\",\r\n                    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-certificate-verification-workflow-for-buyers.webp\"\r\n                ]\r\n            },\r\n            {\r\n                \"@type\": \"FAQPage\",\r\n                \"@id\": \"https:\/\/www.cnspd.com\/ul-1449-vs-iec-61643-spd\/#faq\",\r\n                \"mainEntity\": [\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Is an IEC Type 2 SPD the same as a UL Type 2 SPD?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"No. The two Type 2 classifications belong to different testing and certification frameworks. The exact standard, model, ratings and installation conditions must be verified.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Can an IEC 61643 SPD be described as UL Listed?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"Not from IEC testing alone. A UL Listing claim must be supported by an applicable official UL certification record covering the exact product model.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Is MCOV the same as Uc?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"They serve a similar selection purpose but belong to different standard frameworks. Buyers must check the voltage, circuit mode, network and certification conditions.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Can VPR be converted directly to Up?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"No fixed conversion should be used because VPR and Up are determined under different standardised evaluation conditions.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Does UL 1449 automatically cover a Canadian project?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"No. Canadian projects may require an applicable CSA C22.2 No. 269 certification or a Canadian certification scope shown in the official product record.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Do CE marking or a CB certificate replace UL Listing?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"No. They serve different conformity purposes and do not automatically replace a project requirement for UL or Canadian product certification.\"\r\n                        }\r\n                    },\r\n                    {\r\n                        \"@type\": \"Question\",\r\n                        \"name\": \"Which IEC 61643 part applies to my SPD?\",\r\n                        \"acceptedAnswer\": {\r\n                            \"@type\": \"Answer\",\r\n                            \"text\": \"IEC 61643-11 applies to AC power SPDs, IEC 61643-31 to PV DC SPDs, IEC 61643-41 to other DC power SPDs and IEC 61643-21 to telecommunications and signalling SPDs.\"\r\n                        }\r\n                    }\r\n                ]\r\n            }\r\n        ]\r\n    }\r\n    <\/script>\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>SPD Standards Guide for Global Buyers UL 1449 and the IEC 61643 series both address surge protective devices, but they use different classification, testing, rating and certification frameworks. This guide helps importers, distributors, panel builders, engineering buyers and OEM customers determine which standard and product documents should be required for a specific market or project&#8230;.<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-30341","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>UL 1449 vs IEC 61643: SPD Standards Buyer Guide<\/title>\n<meta name=\"description\" content=\"Compare UL 1449 and IEC 61643 SPD standards, Type classifications, MCOV vs Uc, VPR vs Up, certificate scope and procurement checks.\" \/>\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\/pt\/ul-1449-vs-iec-61643-spd\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UL 1449 vs IEC 61643: SPD Standards Buyer Guide\" \/>\n<meta property=\"og:description\" content=\"Compare UL 1449 and IEC 61643 SPD standards, Type classifications, MCOV vs Uc, VPR vs Up, certificate scope and procurement checks.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/pt\/ul-1449-vs-iec-61643-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-22T08:51:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-23T08:08:12+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"UL 1449 vs IEC 61643: SPD Standard Guide for Global Buyers\",\"datePublished\":\"2026-07-22T08:51:46+00:00\",\"dateModified\":\"2026-07-23T08:08:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/\"},\"wordCount\":2300,\"articleSection\":[\"News\",\"Surge Protection\",\"Technical Guides\"],\"inLanguage\":\"pt-PT\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/\",\"name\":\"UL 1449 vs IEC 61643: SPD Standards Buyer Guide\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"datePublished\":\"2026-07-22T08:51:46+00:00\",\"dateModified\":\"2026-07-23T08:08:12+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Compare UL 1449 and IEC 61643 SPD standards, Type classifications, MCOV vs Uc, VPR vs Up, certificate scope and procurement checks.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ul-1449-vs-iec-61643-spd\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.cnspd.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"UL 1449 vs IEC 61643: SPD Standard Guide for Global Buyers\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/\",\"name\":\"Surge Protector, Surge Arrestor, Isolating Switch - 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