{"id":29582,"date":"2026-06-24T13:44:43","date_gmt":"2026-06-24T05:44:43","guid":{"rendered":"https:\/\/www.cnspd.com\/?page_id=29582"},"modified":"2026-06-24T13:46:46","modified_gmt":"2026-06-24T05:46:46","slug":"spd-for-distribution-board","status":"publish","type":"page","link":"https:\/\/www.cnspd.com\/it\/spd-per-quadro-elettrico\/","title":{"rendered":"SPD per quadro di distribuzione"},"content":{"rendered":"<section class=\"l-section wpb_row height_large width_full\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_grid cols_1 laptops-cols_inherit tablets-cols_inherit mobiles-cols_1 valign_top type_default stacking_default\"><div class=\"wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"w-html us_custom_8b3cf7b3\"><style>\n  .dbspd-page {\n    --blue: #004898;\n    --blue2: #0b63c7;\n    --dark: #102033;\n    --text: #4d5b6b;\n    --muted: #6c7a89;\n    --soft: #f4f8fc;\n    --soft2: #eef6ff;\n    --line: #dbe8f5;\n    --green: #18a058;\n    --orange: #f59f00;\n    --red: #d64545;\n    font-family: inherit;\n    color: var(--dark);\n    background: #fff;\n  }\n\n  .dbspd-page * {\n    box-sizing: border-box;\n  }\n\n  .dbspd-container {\n    width: min(1180px, calc(100% - 36px));\n    margin: 0 auto;\n  }\n\n  .dbspd-hero {\n    padding: 82px 0 64px;\n    background:\n      radial-gradient(circle at 82% 18%, rgba(0,72,152,.13), transparent 32%),\n      radial-gradient(circle at 8% 90%, rgba(24,160,88,.10), transparent 28%),\n      linear-gradient(135deg, #f7fbff 0%, #ffffff 56%, #eef6ff 100%);\n    overflow: hidden;\n  }\n\n  .dbspd-hero-grid {\n    display: grid;\n    grid-template-columns: 1.03fr .97fr;\n    gap: 46px;\n    align-items: center;\n  }\n\n  .dbspd-eyebrow {\n    display: inline-flex;\n    align-items: center;\n    gap: 9px;\n    padding: 8px 13px;\n    border-radius: 999px;\n    background: rgba(255,255,255,.86);\n    border: 1px solid rgba(0,72,152,.18);\n    color: var(--blue);\n    font-size: 14px;\n    font-weight: 800;\n    margin-bottom: 18px;\n  }\n\n  .dbspd-eyebrow:before {\n    content: \"\";\n    width: 8px;\n    height: 8px;\n    border-radius: 99px;\n    background: var(--green);\n    box-shadow: 0 0 0 5px rgba(24,160,88,.12);\n  }\n\n  .dbspd-hero h1 {\n    margin: 0 0 20px;\n    font-size: clamp(38px, 5vw, 66px);\n    line-height: 1.02;\n    letter-spacing: -1.7px;\n    color: var(--dark);\n  }\n\n  .dbspd-hero h1 span {\n    color: var(--blue);\n  }\n\n  .dbspd-lead {\n    margin: 0 0 24px;\n    max-width: 720px;\n    font-size: 18px;\n    line-height: 1.72;\n    color: var(--text);\n  }\n\n  .dbspd-answer {\n    margin: 26px 0 0;\n    padding: 18px 20px;\n    background: #fff;\n    border-left: 5px solid var(--blue);\n    border-radius: 16px;\n    box-shadow: 0 16px 38px rgba(0,72,152,.09);\n  }\n\n  .dbspd-answer p {\n    margin: 0;\n    color: var(--dark);\n    font-size: 16px;\n    line-height: 1.68;\n  }\n\n  .dbspd-answer strong {\n    color: var(--blue);\n  }\n\n  .dbspd-actions {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 14px;\n    margin-top: 28px;\n  }\n\n  .dbspd-btn {\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    min-height: 48px;\n    padding: 14px 22px;\n    border-radius: 999px;\n    font-size: 15px;\n    font-weight: 850;\n    line-height: 1;\n    text-decoration: none !important;\n    transition: .22s ease;\n    cursor: pointer;\n  }\n\n  .dbspd-btn-primary {\n    background: var(--blue);\n    color: #fff !important;\n    box-shadow: 0 14px 28px rgba(0,72,152,.22);\n  }\n\n  .dbspd-btn-primary:hover {\n    background: #003c80;\n    transform: translateY(-2px);\n  }\n\n  .dbspd-btn-secondary {\n    background: #fff;\n    color: var(--blue) !important;\n    border: 1px solid rgba(0,72,152,.22);\n  }\n\n  .dbspd-btn-secondary:hover {\n    border-color: var(--blue);\n    transform: translateY(-2px);\n    box-shadow: 0 12px 24px rgba(0,72,152,.10);\n  }\n\n  .dbspd-visual-card {\n    background: #fff;\n    border: 1px solid rgba(0,72,152,.14);\n    border-radius: 30px;\n    padding: 26px;\n    box-shadow: 0 26px 62px rgba(16,32,51,.11);\n    position: relative;\n  }\n\n  .dbspd-visual-top {\n    display: flex;\n    align-items: center;\n    justify-content: space-between;\n    gap: 14px;\n    margin-bottom: 18px;\n  }\n\n  .dbspd-visual-top strong {\n    font-size: 18px;\n    color: var(--dark);\n  }\n\n  .dbspd-visual-top span {\n    padding: 7px 10px;\n    border-radius: 999px;\n    background: var(--soft2);\n    color: var(--blue);\n    font-size: 12px;\n    font-weight: 900;\n  }\n\n  .dbspd-board {\n    border-radius: 24px;\n    background: linear-gradient(180deg, #f7fbff, #edf5ff);\n    border: 1px solid #d5e7f8;\n    padding: 22px;\n  }\n\n  .dbspd-board-row {\n    display: grid;\n    grid-template-columns: 1fr 1.15fr;\n    gap: 12px;\n    margin-bottom: 12px;\n  }\n\n  .dbspd-module {\n    min-height: 74px;\n    padding: 12px;\n    border-radius: 15px;\n    background: #fff;\n    border: 1px solid #d7e7f7;\n    box-shadow: inset 0 -2px 0 rgba(0,72,152,.06);\n  }\n\n  .dbspd-module small {\n    display: block;\n    margin-bottom: 5px;\n    color: var(--muted);\n    font-size: 11px;\n    text-transform: uppercase;\n    letter-spacing: .06em;\n    font-weight: 900;\n  }\n\n  .dbspd-module b {\n    display: block;\n    color: var(--dark);\n    font-size: 15px;\n    line-height: 1.25;\n  }\n\n  .dbspd-module-spd {\n    background: linear-gradient(135deg, #004898, #0b63c7);\n    border-color: rgba(0,72,152,.28);\n  }\n\n  .dbspd-module-spd small,\n  .dbspd-module-spd b {\n    color: #fff;\n  }\n\n  .dbspd-earth {\n    margin-top: 16px;\n    padding: 13px 14px;\n    background: #102033;\n    color: #fff;\n    border-radius: 15px;\n    display: flex;\n    align-items: center;\n    justify-content: space-between;\n    font-size: 13px;\n    font-weight: 900;\n  }\n\n  .dbspd-visual-note {\n    margin-top: 16px;\n    padding: 13px 14px;\n    border-radius: 15px;\n    background: #fff8e6;\n    border: 1px solid #ffe2a8;\n    color: #665000;\n    font-size: 13px;\n    line-height: 1.55;\n  }\n\n  .dbspd-section {\n    padding: 76px 0;\n  }\n\n  .dbspd-section-soft {\n    background: var(--soft);\n  }\n\n  .dbspd-head {\n    max-width: 860px;\n    margin-bottom: 34px;\n  }\n\n  .dbspd-kicker {\n    margin-bottom: 10px;\n    color: var(--blue);\n    font-size: 14px;\n    font-weight: 950;\n    letter-spacing: .08em;\n    text-transform: uppercase;\n  }\n\n  .dbspd-section h2 {\n    margin: 0 0 14px;\n    color: var(--dark);\n    font-size: clamp(28px, 3.35vw, 42px);\n    line-height: 1.14;\n    letter-spacing: -.8px;\n  }\n\n  .dbspd-head p {\n    margin: 0;\n    color: var(--text);\n    font-size: 17px;\n    line-height: 1.72;\n  }\n\n  .dbspd-grid-2 {\n    display: grid;\n    grid-template-columns: repeat(2, 1fr);\n    gap: 22px;\n  }\n\n  .dbspd-grid-3 {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 18px;\n  }\n\n  .dbspd-card {\n    background: #fff;\n    border: 1px solid var(--line);\n    border-radius: 22px;\n    padding: 24px;\n    box-shadow: 0 12px 30px rgba(16,32,51,.05);\n  }\n\n  .dbspd-icon {\n    width: 44px;\n    height: 44px;\n    border-radius: 15px;\n    background: var(--soft2);\n    color: var(--blue);\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    font-weight: 950;\n    margin-bottom: 16px;\n  }\n\n  .dbspd-card h3 {\n    margin: 0 0 10px;\n    color: var(--dark);\n    font-size: 21px;\n    line-height: 1.25;\n  }\n\n  .dbspd-card p {\n    margin: 0;\n    color: var(--text);\n    line-height: 1.68;\n  }\n\n  .dbspd-table-wrap {\n    overflow-x: auto;\n    border: 1px solid var(--line);\n    border-radius: 22px;\n    background: #fff;\n    box-shadow: 0 12px 30px rgba(16,32,51,.05);\n  }\n\n  .dbspd-table {\n    width: 100%;\n    min-width: 860px;\n    border-collapse: collapse;\n  }\n\n  .dbspd-table th {\n    padding: 16px 18px;\n    background: var(--blue);\n    color: #fff;\n    text-align: left;\n    font-size: 14px;\n    line-height: 1.38;\n  }\n\n  .dbspd-table td {\n    padding: 16px 18px;\n    border-bottom: 1px solid var(--line);\n    color: var(--text);\n    line-height: 1.58;\n    vertical-align: top;\n  }\n\n  .dbspd-table tr:last-child td {\n    border-bottom: 0;\n  }\n\n  .dbspd-table strong {\n    color: var(--dark);\n  }\n\n  .dbspd-badge {\n    display: inline-flex;\n    width: fit-content;\n    padding: 6px 10px;\n    border-radius: 999px;\n    background: var(--soft2);\n    color: var(--blue);\n    font-size: 12px;\n    font-weight: 950;\n    margin-bottom: 10px;\n  }\n\n  .dbspd-badge-orange {\n    background: #fff4dc;\n    color: #9a6400;\n  }\n\n  .dbspd-badge-green {\n    background: #eaf8f1;\n    color: #08713b;\n  }\n\n  .dbspd-rule {\n    background: #fff;\n    border: 1px solid var(--line);\n    border-radius: 24px;\n    padding: 24px;\n    box-shadow: 0 14px 34px rgba(16,32,51,.05);\n  }\n\n  .dbspd-rule ul {\n    display: grid;\n    gap: 14px;\n    margin: 0;\n    padding: 0;\n    list-style: none;\n  }\n\n  .dbspd-rule li {\n    display: grid;\n    grid-template-columns: 34px 1fr;\n    gap: 12px;\n    color: var(--text);\n    line-height: 1.6;\n  }\n\n  .dbspd-rule li span {\n    width: 34px;\n    height: 34px;\n    border-radius: 12px;\n    background: var(--soft2);\n    color: var(--blue);\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    font-weight: 950;\n  }\n\n  .dbspd-warning {\n    padding: 20px 22px;\n    border-radius: 22px;\n    background: #fff9ea;\n    border: 1px solid #ffe1a3;\n    color: #665000;\n    line-height: 1.68;\n  }\n\n  .dbspd-warning strong {\n    color: #4e3c00;\n  }\n\n  .dbspd-product {\n    display: flex;\n    flex-direction: column;\n    min-height: 100%;\n    background: #fff;\n    border: 1px solid var(--line);\n    border-radius: 22px;\n    padding: 24px;\n    box-shadow: 0 12px 30px rgba(16,32,51,.05);\n  }\n\n  .dbspd-product h3 {\n    margin: 0 0 10px;\n    font-size: 21px;\n    color: var(--dark);\n  }\n\n  .dbspd-product p {\n    margin: 0 0 16px;\n    color: var(--text);\n    line-height: 1.68;\n  }\n\n  .dbspd-product ul {\n    margin: 0 0 22px;\n    padding-left: 18px;\n    color: var(--text);\n    line-height: 1.72;\n  }\n\n  .dbspd-product-actions {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 10px;\n    margin-top: auto;\n  }\n\n  .dbspd-mini-btn {\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    padding: 11px 15px;\n    border-radius: 999px;\n    border: 1px solid rgba(0,72,152,.22);\n    background: #fff;\n    color: var(--blue) !important;\n    text-decoration: none !important;\n    font-size: 13px;\n    font-weight: 950;\n  }\n\n  .dbspd-mini-btn:hover {\n    border-color: var(--blue);\n    box-shadow: 0 10px 22px rgba(0,72,152,.10);\n  }\n\n  .dbspd-mini-btn-fill {\n    background: var(--blue);\n    color: #fff !important;\n  }\n\n  .dbspd-checklist {\n    display: grid;\n    grid-template-columns: repeat(2, 1fr);\n    gap: 14px;\n  }\n\n  .dbspd-check {\n    display: grid;\n    grid-template-columns: 26px 1fr;\n    gap: 10px;\n    align-items: start;\n    padding: 16px 17px;\n    border-radius: 18px;\n    background: #fff;\n    border: 1px solid var(--line);\n    color: var(--text);\n    line-height: 1.58;\n  }\n\n  .dbspd-check:before {\n    content: \"\u2713\";\n    width: 26px;\n    height: 26px;\n    border-radius: 99px;\n    background: #eaf8f1;\n    color: var(--green);\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    font-weight: 950;\n  }\n\n  .dbspd-faq {\n    display: grid;\n    gap: 14px;\n  }\n\n  .dbspd-faq details {\n    padding: 18px 20px;\n    border-radius: 18px;\n    border: 1px solid var(--line);\n    background: #fff;\n  }\n\n  .dbspd-faq summary {\n    cursor: pointer;\n    color: var(--dark);\n    font-weight: 950;\n    font-size: 16px;\n  }\n\n  .dbspd-faq p {\n    margin: 12px 0 0;\n    color: var(--text);\n    line-height: 1.68;\n  }\n\n  .dbspd-cta {\n    padding: 74px 0;\n    background:\n      radial-gradient(circle at 16% 12%, rgba(255,255,255,.18), transparent 30%),\n      linear-gradient(135deg, #003b7d, #004898 52%, #0b63c7);\n    color: #fff;\n  }\n\n  .dbspd-cta-grid {\n    display: grid;\n    grid-template-columns: 1.32fr .68fr;\n    gap: 28px;\n    align-items: center;\n  }\n\n  .dbspd-cta h2 {\n    margin: 0 0 12px;\n    color: #fff;\n    font-size: clamp(28px, 3.4vw, 44px);\n    line-height: 1.14;\n  }\n\n  .dbspd-cta p {\n    margin: 0;\n    color: rgba(255,255,255,.86);\n    font-size: 17px;\n    line-height: 1.7;\n  }\n\n  .dbspd-cta .dbspd-btn-secondary {\n    background: #fff;\n    border-color: #fff;\n    color: var(--blue) !important;\n  }\n\n  @media (max-width: 900px) {\n    .dbspd-hero {\n      padding: 54px 0 44px;\n    }\n\n    .dbspd-hero-grid,\n    .dbspd-grid-2,\n    .dbspd-cta-grid {\n      grid-template-columns: 1fr;\n    }\n\n    .dbspd-grid-3 {\n      grid-template-columns: 1fr;\n    }\n\n    .dbspd-checklist {\n      grid-template-columns: 1fr;\n    }\n\n    .dbspd-section {\n      padding: 54px 0;\n    }\n  }\n\n  @media (max-width: 560px) {\n    .dbspd-container {\n      width: min(100% - 26px, 1180px);\n    }\n\n    .dbspd-hero h1 {\n      font-size: 36px;\n    }\n\n    .dbspd-lead {\n      font-size: 16px;\n    }\n\n    .dbspd-actions {\n      flex-direction: column;\n    }\n\n    .dbspd-btn {\n      width: 100%;\n    }\n\n    .dbspd-visual-card {\n      padding: 18px;\n      border-radius: 22px;\n    }\n\n    .dbspd-board-row {\n      grid-template-columns: 1fr;\n    }\n\n    .dbspd-card,\n    .dbspd-rule,\n    .dbspd-product {\n      padding: 20px;\n    }\n  }\n<\/style>\n\n<div class=\"dbspd-page\">\n\n  <section class=\"dbspd-hero\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-hero-grid\">\n        <div>\n          <div class=\"dbspd-eyebrow\">Distribution Board Surge Protection Selection<\/div>\n          <h1>SPD for <span>Distribution Board<\/span><\/h1>\n          <p class=\"dbspd-lead\">\n            Choose the right surge protective device for main distribution boards, sub-distribution boards, consumer units, and industrial electrical panels. This page helps buyers compare Type 2 and Type 1+2 DIN rail SPDs, pole configurations, grounding requirements, and installation positions.\n          <\/p>\n\n          <div class=\"dbspd-answer\">\n            <p>\n              <strong>Quick answer:<\/strong> Most sub-distribution boards use a Type 2 DIN rail SPD. Main incoming distribution boards may need a Type 1+2 SPD when the building has higher lightning exposure, an external lightning protection system, or an overhead supply. The SPD must match the AC voltage, earthing system, phase configuration, surge rating, and backup protection requirement.\n            <\/p>\n          <\/div>\n\n          <div class=\"dbspd-actions\">\n            <a class=\"dbspd-btn dbspd-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Request SPD Selection<\/a>\n            <a class=\"dbspd-btn dbspd-btn-secondary\" href=\"https:\/\/www.cnspd.com\/type-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">View Type 2 DIN Rail SPD<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"dbspd-visual-card\">\n          <div class=\"dbspd-visual-top\">\n            <strong>Distribution Board SPD Position<\/strong>\n            <span>DIN Rail Layout<\/span>\n          <\/div>\n\n          <div class=\"dbspd-board\">\n            <div class=\"dbspd-board-row\">\n              <div class=\"dbspd-module\">\n                <small>Incoming<\/small>\n                <b>Main Supply<\/b>\n              <\/div>\n              <div class=\"dbspd-module\">\n                <small>Protection<\/small>\n                <b>Main Switch \/ Breaker<\/b>\n              <\/div>\n            <\/div>\n\n            <div class=\"dbspd-board-row\">\n              <div class=\"dbspd-module dbspd-module-spd\">\n                <small>Parallel Protection<\/small>\n                <b>Type 2 \/ Type 1+2 SPD<\/b>\n              <\/div>\n              <div class=\"dbspd-module\">\n                <small>Outgoing<\/small>\n                <b>MCB \/ RCD \/ Loads<\/b>\n              <\/div>\n            <\/div>\n\n            <div class=\"dbspd-earth\">\n              <span>PE \/ Earth Bar<\/span>\n              <span>Short, Direct Lead<\/span>\n            <\/div>\n\n            <div class=\"dbspd-visual-note\">\n              Install the SPD close to the incoming side of the board and keep the connection to live conductors and earth as short and straight as practical.\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">AI-Readable Selection Map<\/div>\n        <h2>Which SPD should be used in each distribution board?<\/h2>\n        <p>\n          Distribution board SPD selection starts with the board position. A main incoming board, sub-board, consumer unit, and industrial control panel do not always need the same SPD type.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-table-wrap\">\n        <table class=\"dbspd-table\">\n          <thead>\n            <tr>\n              <th>Board Position<\/th>\n              <th>Recommended SPD<\/th>\n              <th>Typical Application<\/th>\n              <th>Key Decision Point<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Main distribution board \/ MDB<\/strong><\/td>\n              <td>Type 1+2 SPD or Type 2 SPD<\/td>\n              <td>Building incoming panel, main switchboard, service entrance<\/td>\n              <td>Use Type 1+2 if lightning exposure, external LPS, or overhead supply risk is present.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Sub-distribution board<\/strong><\/td>\n              <td>Type 2 DIN rail SPD<\/td>\n              <td>Workshop DB, office floor DB, machine area panel, electrical room<\/td>\n              <td>Most common distribution board SPD choice for secondary protection.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Consumer unit<\/strong><\/td>\n              <td>1P+N or 2P Type 2 SPD<\/td>\n              <td>Residential and small commercial AC boards<\/td>\n              <td>Match single-phase wiring, neutral protection, and local installation practice.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Three-phase distribution board<\/strong><\/td>\n              <td>3P, 3P+N, or 4P Type 2 SPD<\/td>\n              <td>Commercial buildings, factories, pumps, HVAC, industrial loads<\/td>\n              <td>Match phase system, neutral structure, and earthing system.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Industrial control panel<\/strong><\/td>\n              <td>Type 2 SPD, sometimes with downstream Type 3<\/td>\n              <td>PLC cabinets, automation panels, control rooms<\/td>\n              <td>Use lower Up and short wiring to protect sensitive electronics.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section dbspd-section-soft\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Type 2 vs Type 1+2<\/div>\n        <h2>When is Type 2 enough, and when do you need Type 1+2?<\/h2>\n        <p>\n          ONCCY gives simple kA recommendations, but a stronger distribution board page should explain the decision path. The SPD type is not selected only by breaker size. It also depends on board position, lightning risk, incoming line type, earthing, and project requirements.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-grid-2\">\n        <div class=\"dbspd-card\">\n          <span class=\"dbspd-badge dbspd-badge-green\">Most common<\/span>\n          <h3>Use Type 2 SPD for most sub-distribution boards<\/h3>\n          <p>\n            Type 2 DIN rail SPDs are typically used for secondary surge protection in downstream distribution boards, commercial panels, machine panels, and consumer units. They are tested with the 8\/20 \u03bcs surge waveform and are used to limit transient overvoltage from indirect lightning and switching surges.\n          <\/p>\n        <\/div>\n\n        <div class=\"dbspd-card\">\n          <span class=\"dbspd-badge dbspd-badge-orange\">Higher exposure<\/span>\n          <h3>Use Type 1+2 SPD for main incoming boards when required<\/h3>\n          <p>\n            A Type 1+2 SPD is used when the distribution board is at the incoming side of the installation and may need to discharge partial lightning current. This is common for exposed buildings, external lightning protection systems, or overhead power supply conditions.\n          <\/p>\n        <\/div>\n      <\/div>\n\n      <div class=\"dbspd-warning\" style=\"margin-top:22px;\">\n        <strong>Selection note:<\/strong> Do not treat \u201c40kA\u201d or \u201c80kA\u201d as the only decision. For distribution boards, confirm Uc, In, Imax, Iimp when relevant, Up, short-circuit withstand, backup protection, pole configuration, and local code requirements.\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Sizing Rules<\/div>\n        <h2>How to size an SPD for a distribution board<\/h2>\n        <p>\n          This page uses a safer engineering logic than a simple \u201cbreaker amp = SPD kA\u201d rule. The table below gives a practical buyer-friendly direction without making the selection too absolute.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-table-wrap\">\n        <table class=\"dbspd-table\">\n          <thead>\n            <tr>\n              <th>Selection Item<\/th>\n              <th>What to Check<\/th>\n              <th>Practical Direction<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>SPD Type<\/strong><\/td>\n              <td>Type 1+2 or Type 2<\/td>\n              <td>Main incoming board with high exposure may require Type 1+2. Sub-distribution boards commonly use Type 2.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Uc<\/strong><\/td>\n              <td>Maximum continuous operating voltage<\/td>\n              <td>Match the AC system voltage and earthing arrangement. Do not use DC SPD for normal AC distribution boards.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>In<\/strong><\/td>\n              <td>Nominal discharge current<\/td>\n              <td>Common Type 2 DB SPDs are often selected around 20kA or 40kA In, depending on exposure and specification.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Imax<\/strong><\/td>\n              <td>Maximum discharge current<\/td>\n              <td>Higher Imax may be chosen for larger panels, harsher surge environments, or project requirements.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Iimp<\/strong><\/td>\n              <td>Lightning impulse current for Type 1 \/ Type 1+2<\/td>\n              <td>Relevant for incoming distribution boards where lightning current handling is required.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Up<\/strong><\/td>\n              <td>Voltage protection level<\/td>\n              <td>Lower Up helps reduce residual stress on downstream equipment, especially electronics and control devices.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Backup protection<\/strong><\/td>\n              <td>Fuse or breaker coordination<\/td>\n              <td>Follow the SPD datasheet for maximum backup fuse, short-circuit rating, and installation method.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Remote signal<\/strong><\/td>\n              <td>Status monitoring contact<\/td>\n              <td>Useful for commercial, industrial, and OEM boards that require maintenance visibility.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section dbspd-section-soft\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Pole Configuration<\/div>\n        <h2>Single-phase and three-phase distribution board SPD selection<\/h2>\n        <p>\n          This is where our page can clearly beat generic SPD size articles. Distribution board buyers often need to know whether to choose 1P+N, 2P, 3P, 3P+N, or 4P.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-grid-3\">\n        <div class=\"dbspd-card\">\n          <div class=\"dbspd-icon\">1\u03a6<\/div>\n          <h3>Single-phase board<\/h3>\n          <p>\n            Common for residential and small commercial boards. Typical SPD options include 1P+N or 2P Type 2 SPD, depending on wiring system and local installation practice.\n          <\/p>\n        <\/div>\n\n        <div class=\"dbspd-card\">\n          <div class=\"dbspd-icon\">3\u03a6<\/div>\n          <h3>Three-phase board without neutral protection<\/h3>\n          <p>\n            Some three-phase systems use 3P SPD configurations. This should match the earthing system and project wiring design.\n          <\/p>\n        <\/div>\n\n        <div class=\"dbspd-card\">\n          <div class=\"dbspd-icon\">4P<\/div>\n          <h3>Three-phase board with neutral<\/h3>\n          <p>\n            3P+N or 4P SPD options are common where neutral protection is required. This is often important for commercial and industrial distribution boards.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Earthing System<\/div>\n        <h2>Earthing system affects distribution board SPD selection<\/h2>\n        <p>\n          A good SPD page should not ignore grounding. The earthing system affects protection mode, pole configuration, neutral protection, and backup design.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-table-wrap\">\n        <table class=\"dbspd-table\">\n          <thead>\n            <tr>\n              <th>Earthing System<\/th>\n              <th>Common Selection Concern<\/th>\n              <th>Buyer Note<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>TN-S<\/strong><\/td>\n              <td>Separate neutral and PE conductors<\/td>\n              <td>Common in commercial and industrial installations. Match SPD mode to the system design.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>TN-C-S<\/strong><\/td>\n              <td>PEN conductor separated into N and PE downstream<\/td>\n              <td>Confirm where the SPD is installed relative to the separation point.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>TT<\/strong><\/td>\n              <td>Earth fault and neutral-to-earth protection require care<\/td>\n              <td>Neutral protection and RCD coordination may need special attention.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>IT<\/strong><\/td>\n              <td>Insulated or impedance-earthed system<\/td>\n              <td>Final SPD choice should follow project specification and system design.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"dbspd-warning\" style=\"margin-top:22px;\">\n        <strong>Important:<\/strong> Final wiring and SPD installation should be confirmed by a qualified electrical designer or electrician according to local rules and the SPD datasheet.\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section dbspd-section-soft\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Installation Position<\/div>\n        <h2>Where should the SPD be installed in a distribution board?<\/h2>\n        <p>\n          SPD performance is affected by wiring length and layout. The device should be placed where it can divert surge current to earth with the shortest practical connection path.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-grid-2\">\n        <div class=\"dbspd-rule\">\n          <ul>\n            <li>\n              <span>1<\/span>\n              <div><strong>Install close to the incoming side.<\/strong><br>Place the SPD near the main switch, incoming breaker, or supply entry point when board layout allows.<\/div>\n            <\/li>\n            <li>\n              <span>2<\/span>\n              <div><strong>Keep wires short and straight.<\/strong><br>Long leads increase residual voltage during a surge. Avoid unnecessary loops and sharp routing.<\/div>\n            <\/li>\n            <li>\n              <span>3<\/span>\n              <div><strong>Use proper PE connection.<\/strong><br>The SPD must be connected to a reliable earth bar with suitable conductor sizing.<\/div>\n            <\/li>\n            <li>\n              <span>4<\/span>\n              <div><strong>Check backup protection.<\/strong><br>Use the fuse or breaker rating recommended in the SPD datasheet.<\/div>\n            <\/li>\n          <\/ul>\n        <\/div>\n\n        <div class=\"dbspd-rule\">\n          <ul>\n            <li>\n              <span>5<\/span>\n              <div><strong>Do not mix AC and DC SPD.<\/strong><br>AC distribution boards need AC-rated SPDs. DC\/PV SPDs are for photovoltaic strings, DC combiner boxes, and DC circuits.<\/div>\n            <\/li>\n            <li>\n              <span>6<\/span>\n              <div><strong>Check RCD coordination.<\/strong><br>SPD position relative to RCDs depends on board design, earthing system, and local rules.<\/div>\n            <\/li>\n            <li>\n              <span>7<\/span>\n              <div><strong>Leave enough DIN rail space.<\/strong><br>Confirm module width, wiring space, and maintenance access before ordering.<\/div>\n            <\/li>\n            <li>\n              <span>8<\/span>\n              <div><strong>Use remote signal when needed.<\/strong><br>Commercial and industrial projects may require SPD status monitoring.<\/div>\n            <\/li>\n          <\/ul>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">LEEYEE Product Mapping<\/div>\n        <h2>Recommended LEEYEE SPDs for distribution board applications<\/h2>\n        <p>\n          LEEYEE is a specialized surge protection and low-voltage protection supplier, trusted for solar PV, power distribution, telecom, industrial, and OEM applications. CNSPD is LEEYEE\u2019s surge protection-focused brand platform.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-grid-3\">\n        <div class=\"dbspd-product\">\n          <span class=\"dbspd-badge dbspd-badge-green\">For most DBs<\/span>\n          <h3>Type 2 DIN Rail SPD<\/h3>\n          <p>\n            The most common choice for sub-distribution boards, consumer units, commercial panels, and general AC distribution protection.\n          <\/p>\n          <ul>\n            <li>For secondary surge protection<\/li>\n            <li>Single-phase and three-phase options<\/li>\n            <li>Pluggable module options available<\/li>\n          <\/ul>\n          <div class=\"dbspd-product-actions\">\n            <a class=\"dbspd-mini-btn\" href=\"https:\/\/www.cnspd.com\/type-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">View Page<\/a>\n            <a class=\"dbspd-mini-btn dbspd-mini-btn-fill leeyee-site-popup-btn\" href=\"javascript:void(0);\">Get Quote<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"dbspd-product\">\n          <span class=\"dbspd-badge dbspd-badge-orange\">For incoming boards<\/span>\n          <h3>Type 1+2 DIN Rail SPD<\/h3>\n          <p>\n            Used where the main distribution board may need combined lightning current and surge protection.\n          <\/p>\n          <ul>\n            <li>For exposed incoming panels<\/li>\n            <li>Useful before downstream Type 2 SPD<\/li>\n            <li>Suitable for higher-risk projects<\/li>\n          <\/ul>\n          <div class=\"dbspd-product-actions\">\n            <a class=\"dbspd-mini-btn\" href=\"https:\/\/www.cnspd.com\/type-1-2-din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">View Page<\/a>\n            <a class=\"dbspd-mini-btn dbspd-mini-btn-fill leeyee-site-popup-btn\" href=\"javascript:void(0);\">Get Quote<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"dbspd-product\">\n          <span class=\"dbspd-badge\">Family page<\/span>\n          <h3>DIN Rail Surge Protector<\/h3>\n          <p>\n            Compare AC, DC, Type 2, and Type 1+2 DIN rail surge protectors for distribution boards, control panels, solar systems, and OEM assemblies.\n          <\/p>\n          <ul>\n            <li>DIN rail mounted SPD family<\/li>\n            <li>AC and DC options<\/li>\n            <li>OEM and private label support<\/li>\n          <\/ul>\n          <div class=\"dbspd-product-actions\">\n            <a class=\"dbspd-mini-btn\" href=\"https:\/\/www.cnspd.com\/din-rail-surge-protector\/\" target=\"_blank\" rel=\"noopener\">View Page<\/a>\n            <a class=\"dbspd-mini-btn dbspd-mini-btn-fill leeyee-site-popup-btn\" href=\"javascript:void(0);\">Get Quote<\/a>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section dbspd-section-soft\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">Quote Checklist<\/div>\n        <h2>Send these details for a faster SPD recommendation<\/h2>\n        <p>\n          This checklist makes the page stronger than a normal blog post because it helps real buyers move from reading to selection.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-checklist\">\n        <div class=\"dbspd-check\">Distribution board type: main board, sub-board, consumer unit, control panel, or OEM electrical box.<\/div>\n        <div class=\"dbspd-check\">AC system voltage: for example 230V, 400V, 480V, or other project voltage.<\/div>\n        <div class=\"dbspd-check\">Phase system: single-phase or three-phase.<\/div>\n        <div class=\"dbspd-check\">Earthing system: TT, TN-S, TN-C-S, TN-C, or IT, if known.<\/div>\n        <div class=\"dbspd-check\">Required SPD type: Type 2, Type 1+2, or not sure.<\/div>\n        <div class=\"dbspd-check\">Pole configuration: 1P+N, 2P, 3P, 3P+N, or 4P.<\/div>\n        <div class=\"dbspd-check\">Surge rating requirement: In, Imax, Iimp, or project specification.<\/div>\n        <div class=\"dbspd-check\">Need for remote signal contact, visual indicator, or pluggable replacement module.<\/div>\n        <div class=\"dbspd-check\">Certification or market requirement: IEC, EN, CE, TUV, or local project standard.<\/div>\n        <div class=\"dbspd-check\">Quantity, OEM logo, packaging, datasheet, and delivery schedule.<\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-section\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-head\">\n        <div class=\"dbspd-kicker\">FAQ<\/div>\n        <h2>SPD for distribution board FAQ<\/h2>\n        <p>\n          These FAQs are written in a direct answer format so search engines and AI systems can easily understand the page intent.\n        <\/p>\n      <\/div>\n\n      <div class=\"dbspd-faq\">\n        <details open>\n          <summary>What type of SPD is used in a distribution board?<\/summary>\n          <p>\n            Most sub-distribution boards use a Type 2 DIN rail SPD. Main incoming distribution boards may need a Type 1+2 SPD if the building has higher lightning exposure, an external lightning protection system, or an overhead power supply.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Is Type 2 SPD enough for a distribution board?<\/summary>\n          <p>\n            Type 2 SPD is enough for many sub-distribution boards and consumer units. However, if the board is at the service entrance or exposed to higher lightning current risk, Type 1+2 protection may be required.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Where should an SPD be installed in a distribution board?<\/summary>\n          <p>\n            The SPD is usually installed close to the incoming side of the board and connected in parallel to the supply. The connection to live conductors and earth should be short and straight.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What kA rating should I choose for a distribution board SPD?<\/summary>\n          <p>\n            Many Type 2 distribution board SPDs are selected around 20kA or 40kA In, with higher Imax options used for larger panels or harsher surge environments. Final selection should also consider voltage, earthing, short-circuit rating, backup protection, and local code.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What is the difference between Type 1+2 SPD and Type 2 SPD?<\/summary>\n          <p>\n            Type 1+2 SPD can handle lightning impulse current and is commonly used at incoming boards when lightning exposure is higher. Type 2 SPD is used for secondary surge protection in sub-distribution boards and downstream panels.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Can I use a DC SPD in an AC distribution board?<\/summary>\n          <p>\n            No. AC distribution boards should use AC-rated SPDs. DC SPDs are designed for PV strings, battery systems, DC combiner boxes, and other DC circuits.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What information is needed to choose the right SPD?<\/summary>\n          <p>\n            Confirm the board position, AC voltage, phase system, earthing system, SPD type, pole configuration, surge rating, backup protection, and whether remote signal monitoring is needed.\n          <\/p>\n        <\/details>\n      <\/div>\n    <\/div>\n  <\/section>\n\n\n  <section class=\"dbspd-cta\">\n    <div class=\"dbspd-container\">\n      <div class=\"dbspd-cta-grid\">\n        <div>\n          <h2>Need the right SPD for your distribution board?<\/h2>\n          <p>\n            Send your board type, voltage, phase system, earthing system, and project market. LEEYEE can help you select a suitable DIN rail SPD for residential, commercial, industrial, or OEM distribution board applications.\n          <\/p>\n        <\/div>\n\n        <div class=\"dbspd-actions\" style=\"justify-content:flex-start;\">\n          <a class=\"dbspd-btn dbspd-btn-secondary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Request Selection Support<\/a>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<\/div>\n\n\n<script>\n  document.addEventListener('DOMContentLoaded', function () {\n    var popupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\n\n    popupButtons.forEach(function (btn) {\n      btn.addEventListener('click', function (e) {\n        e.preventDefault();\n\n        var popupTrigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\n\n        if (popupTrigger) {\n          popupTrigger.click();\n        } else {\n          window.open('https:\/\/www.cnspd.com\/contact\/', '_blank');\n        }\n      });\n    });\n  });\n<\/script>\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"WebPage\",\n      \"@id\": \"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\",\n      \"url\": \"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\",\n      \"name\": \"SPD for Distribution Board: Type 2 & Type 1+2 Selection | LEEYEE\",\n      \"description\": \"Choose the right SPD for distribution boards. 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The connection to live conductors and earth should be short and straight.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What kA rating should I choose for a distribution board SPD?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Many Type 2 distribution board SPDs are selected around 20kA or 40kA In, with higher Imax options used for larger panels or harsher surge environments. Final selection should also consider voltage, earthing, short-circuit rating, backup protection, and local code.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the difference between Type 1+2 SPD and Type 2 SPD?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Type 1+2 SPD can handle lightning impulse current and is commonly used at incoming boards when lightning exposure is higher. 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This page helps buyers compare Type 2 and Type 1+2 DIN rail SPDs, pole configurations, grounding requirements, and installation positions. Quick answer: Most sub-distribution boards use a Type...","protected":false},"author":18,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-29582","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SPD for Distribution Board: Type 2 &amp; Type 1+2 Selection | LEEYEE<\/title>\n<meta name=\"description\" content=\"Choose the right SPD for distribution boards. 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