{"id":30380,"date":"2026-07-23T13:24:25","date_gmt":"2026-07-23T05:24:25","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30380"},"modified":"2026-07-23T16:08:39","modified_gmt":"2026-07-23T08:08:39","slug":"tn-c-s-system-spd-wiring-guide-pen-split-3p-4p-or-3pn","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/","title":{"rendered":"Guide de c\u00e2blage SPD du syst\u00e8me TN-C-S : PEN Split, 3P, 4P ou 3P+N"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30380\" class=\"elementor elementor-30380\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c148195 e-flex e-con-boxed e-con e-parent\" data-id=\"c148195\" 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-588fe28 elementor-widget elementor-widget-html\" data-id=\"588fe28\" data-element_type=\"widget\" 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.tncs-warning-box p:last-child,\r\n.leeyee-tncs-guide .tncs-warning-box ul:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-two-column {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 1rem;\r\n  margin: 1rem 0 1.45rem;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-mini-panel {\r\n  padding: 1rem;\r\n  border: 1px solid var(--tncs-border);\r\n  border-radius: var(--tncs-radius);\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-mini-panel h3 {\r\n  margin: 0 0 0.52rem;\r\n  font-size: 21px;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-mini-panel ul {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-do {\r\n  border-top: 4px solid var(--tncs-success);\r\n  background: var(--tncs-success-bg);\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-dont {\r\n  border-top: 4px solid var(--tncs-warning);\r\n  background: var(--tncs-warning-bg);\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-steps {\r\n  counter-reset: tncs-step;\r\n  list-style: none;\r\n 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14px;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-faq {\r\n  margin-top: 0.75rem;\r\n  border-top: 1px solid var(--tncs-border);\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-faq-item {\r\n  padding: 0.95rem 0 0.1rem;\r\n  border-bottom: 1px solid var(--tncs-border);\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-faq-item h3 {\r\n  margin: 0 0 0.38rem;\r\n  font-size: 21px;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-related {\r\n  margin: 1rem 0 1.55rem;\r\n  padding: 0.92rem 1rem;\r\n  border-left: 4px solid var(--tncs-blue);\r\n  background: #f8fafc;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-related ul {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-references {\r\n  margin-top: 2.05rem;\r\n  padding-top: 0.15rem;\r\n  border-top: 2px solid var(--tncs-border);\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-references ol {\r\n  padding-left: 1.25rem;\r\n}\r\n\r\n.leeyee-tncs-guide .tncs-references li {\r\n  margin-bottom: 0.7rem;\r\n  color: #465563;\r\n  font-size: 14.5px;\r\n  line-height: 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transparent;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards thead {\r\n    display: none;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards tr {\r\n    margin-bottom: 0.82rem;\r\n    border: 1px solid var(--tncs-border);\r\n    border-radius: 8px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards td {\r\n    display: grid;\r\n    grid-template-columns: minmax(112px, 38%) minmax(0, 1fr);\r\n    gap: 0.7rem;\r\n    padding: 0.65rem 0.75rem;\r\n    border: 0;\r\n    border-bottom: 1px solid var(--tncs-border);\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards td::before {\r\n    content: attr(data-label);\r\n    color: var(--tncs-blue-dark);\r\n    font-weight: 700;\r\n  }\r\n\r\n  .leeyee-tncs-guide .tncs-figure {\r\n    margin: 1.18rem 0 1.42rem;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  .leeyee-tncs-guide {\r\n    font-size: 15.8px;\r\n  }\r\n\r\n  .leeyee-tncs-guide .tncs-lead {\r\n    font-size: 18px;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards td {\r\n    display: block;\r\n  }\r\n\r\n  .leeyee-tncs-guide table.tncs-mobile-cards td::before {\r\n    display: block;\r\n    margin-bottom: 0.2rem;\r\n  }\r\n\r\n  .leeyee-tncs-guide .tncs-steps li {\r\n    padding-right: 0.2rem;\r\n  }\r\n\r\n  .leeyee-tncs-guide .tncs-cta .leeyee-site-popup-btn {\r\n    width: 100%;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-tn-c-s-spd-wiring-guide\" class=\"leeyee-tncs-guide\" aria-label=\"TN-C-S system SPD wiring guide\">\r\n  <header class=\"tncs-intro\">\r\n    <p class=\"tncs-lead\"><strong>TN-C-S SPD wiring depends first on the PEN separation point\u2014not only on whether a product is described as 3P, 4P or 3P+N.<\/strong><\/p>\r\n    <p class=\"tncs-scope\">This guide helps panel builders, electrical contractors, consultants, distributors and OEM buyers determine whether the SPD will be installed on the TN-C section or on the separated TN-S section.<\/p>\r\n  <\/header>\r\n\r\n  <div class=\"tncs-safety\" role=\"note\">\r\n    <strong>Safety note:<\/strong> SPD installation and verification must be completed by qualified electrical personnel. The final arrangement must follow the applicable national wiring rules, the approved single-line diagram, supply-authority requirements and the selected SPD manufacturer\u2019s instructions.\r\n  <\/div>\r\n\r\n  <section class=\"tncs-quick-answer\" aria-labelledby=\"tncs-quick-answer\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#quick-answer-where-should-the-spd-connect\" >Quick Answer: Where Should the SPD Connect?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#how-does-the-tn-c-s-system-change-at-the-pen-split\" >How Does the TN-C-S System Change at the PEN Split?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#should-the-spd-be-installed-before-or-after-pen-separation\" >Should the SPD Be Installed Before or After PEN Separation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#3p-4p-or-3pn-what-must-the-buyer-verify\" >3P, 4P or 3P+N: What Must the Buyer Verify?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#how-should-n-and-pe-be-handled-after-the-split\" >How Should N and PE Be Handled After the Split?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#installation-details-that-affect-real-spd-performance\" >Installation Details That Affect Real SPD Performance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#does-an-spd-protect-against-a-broken-pen\" >Does an SPD Protect Against a Broken PEN?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#seven-common-tn-c-s-spd-mistakes\" >Seven Common TN-C-S SPD Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#tn-c-s-spd-engineering-selection-workflow\" >TN-C-S SPD Engineering Selection Workflow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#what-should-be-confirmed-before-ordering\" >What Should Be Confirmed Before Ordering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#need-to-confirm-a-tn-c-s-spd-configuration\" >Need to Confirm a TN-C-S SPD Configuration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#related-technical-guides\" >Related Technical Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"tncs-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-where-should-the-spd-connect\"><\/span>Quick Answer: Where Should the SPD Connect?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>A TN-C-S supply contains two electrically different sections:<\/p>\r\n\r\n    <ul>\r\n      <li><strong>Before PEN separation:<\/strong> neutral and protective-earth functions share the PEN conductor. This is the TN-C section.<\/li>\r\n      <li><strong>After PEN separation:<\/strong> N and PE are separate. This downstream section is treated as TN-S.<\/li>\r\n    <\/ul>\r\n\r\n    <div class=\"tncs-key-rule\">\r\n      Locate the PEN separation point. Then select the SPD for the network section where it will actually be installed.\r\n    <\/div>\r\n\r\n    <div class=\"tncs-table-wrap\">\r\n      <table class=\"tncs-mobile-cards\">\r\n        <thead>\r\n          <tr>\r\n            <th scope=\"col\">SPD location<\/th>\r\n            <th scope=\"col\">Conductors present<\/th>\r\n            <th scope=\"col\">Selection direction<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"SPD location\"><strong>Before the split<\/strong><\/td>\r\n            <td data-label=\"Conductors\">L1, L2, L3, PEN<\/td>\r\n            <td data-label=\"Selection direction\">Use a TN-C-approved 3P or 3+0 arrangement connected from the phases to PEN.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"SPD location\"><strong>At the split<\/strong><\/td>\r\n            <td data-label=\"Conductors\">PEN transitions to separate N and PE<\/td>\r\n            <td data-label=\"Selection direction\">Confirm the exact connection, ownership boundary and national rules from the project documents.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"SPD location\"><strong>After the split<\/strong><\/td>\r\n            <td data-label=\"Conductors\">L1, L2, L3, N, PE<\/td>\r\n            <td data-label=\"Selection direction\">Use an SPD approved for the TN-S section. Depending on the design, this may use 4+0 or 3+1 protection modes.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"SPD location\"><strong>Downstream panel<\/strong><\/td>\r\n            <td data-label=\"Conductors\">Separate N and PE<\/td>\r\n            <td data-label=\"Selection direction\">Treat the protection point as TN-S and coordinate it with the upstream SPD.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"tncs-table-conclusion\">The pole count alone does not confirm the internal protection circuit.<\/p>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-system-structure\">\r\n    <h2 id=\"tncs-system-structure\"><span class=\"ez-toc-section\" id=\"how-does-the-tn-c-s-system-change-at-the-pen-split\"><\/span>How Does the TN-C-S System Change at the PEN Split?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>PEN<\/strong> is a conductor that performs both protective-earth and neutral functions. Before separation, a three-phase TN-C section normally has L1, L2, L3 and PEN.<\/p>\r\n\r\n    <p>At the designated separation point, PEN divides into:<\/p>\r\n\r\n    <ul>\r\n      <li><strong>N:<\/strong> the neutral conductor used for normal load return current.<\/li>\r\n      <li><strong>PE:<\/strong> the protective conductor used for bonding and fault-current paths.<\/li>\r\n    <\/ul>\r\n\r\n    <p>After separation, N and PE have different functions and should remain separate throughout the downstream installation. IEC 60364-1 provides the fundamental framework and terminology for low-voltage earthing arrangements.<a class=\"tncs-ref\" href=\"#tncs-reference-1\">[1]<\/a><\/p>\r\n\r\n    <p>Schneider Electric also distinguishes the TN-C part before separation from the TN-S part after separation when explaining SPD suitability in a TN-C-S network.<a class=\"tncs-ref\" href=\"#tncs-reference-2\">[2]<\/a><\/p>\r\n\r\n    <figure class=\"tncs-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/tn-c-s-pen-separation-system-architecture.webp\" alt=\"TN-C-S electrical system showing the PEN conductor separation into neutral and protective earth\" width=\"1448\" height=\"1086\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>The system topology changes at the PEN separation point. Before the split, the reference conductor is PEN. After the split, the installation has separate N and PE conductors.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <div class=\"tncs-meaning\">\r\n      <strong>Engineering meaning<\/strong>\r\n      <p>A project description that only says \u201cTN-C-S\u201d is incomplete for SPD selection. The single-line diagram must show where PEN becomes N and PE and where the SPD will be installed.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-before-or-after\">\r\n    <h2 id=\"tncs-before-or-after\"><span class=\"ez-toc-section\" id=\"should-the-spd-be-installed-before-or-after-pen-separation\"><\/span>Should the SPD Be Installed Before or After PEN Separation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>There is no single installation position that applies to every TN-C-S project.<\/p>\r\n\r\n    <p>In many customer-side switchboards, the SPD is installed after PEN separation. The protection point is then on the TN-S part of the supply.<\/p>\r\n\r\n    <p>An SPD can also be applied on the TN-C section where the project design, supply boundary and local rules permit it. The product must then be approved for connection between the phase conductors and PEN.<\/p>\r\n\r\n    <p>Schneider Electric states that an SPD compatible with TN-S can be used on the TN-S part of a TN-C-S network, while a TN-C-compatible 3P SPD is required on the TN-C part.<a class=\"tncs-ref\" href=\"#tncs-reference-2\">[2]<\/a><\/p>\r\n\r\n    <h3>Before PEN separation: TN-C section<\/h3>\r\n\r\n    <p>The available conductors are normally L1, L2, L3 and PEN. There is no separate N conductor or separate PE conductor at this point.<\/p>\r\n\r\n    <p>A typical 3+0 protection arrangement connects:<\/p>\r\n\r\n    <ul>\r\n      <li>L1 to PEN<\/li>\r\n      <li>L2 to PEN<\/li>\r\n      <li>L3 to PEN<\/li>\r\n    <\/ul>\r\n\r\n    <p>DEHN publishes a TN-C sample installation using a 3+0 configuration.<a class=\"tncs-ref\" href=\"#tncs-reference-3\">[3]<\/a><\/p>\r\n\r\n    <p>Before approving the model, confirm that it is explicitly suitable for TN-C use, that its diagram permits connection to PEN and that the installation location is allowed by the responsible project or supply authority.<\/p>\r\n\r\n    <h3>After PEN separation: TN-S section<\/h3>\r\n\r\n    <p>The available conductors are L1, L2, L3, N and PE. The SPD is now installed on the separated TN-S part of the TN-C-S system.<\/p>\r\n\r\n    <p>Manufacturer application documents show that approved TN-S solutions can use different internal arrangements. DEHN publishes a TN-S sample installation using 4+0 and also lists 3+1 products for TT and TN-S systems.<a class=\"tncs-ref\" href=\"#tncs-reference-3\">[3]<\/a><\/p>\r\n\r\n    <p>The final choice between 4+0 and 3+1 depends on the approved product design, national rules, TOV requirements, RCD coordination and project specification.<\/p>\r\n\r\n    <figure class=\"tncs-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/tn-c-s-spd-wiring-before-after-pen-split.webp\" alt=\"Comparison of SPD wiring before and after PEN separation in a three-phase TN-C-S system\" width=\"1448\" height=\"1086\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>A 3+0 arrangement may be used on an approved TN-C section. After separation, the SPD is selected for the TN-S section and may use an approved 4+0 or 3+1 circuit.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <div class=\"tncs-warning-box\">\r\n      <h3>A special arrangement near the split is not a universal rule<\/h3>\r\n      <p>A DEHN switchgear white paper shows one specific arrangement in which another 3+0 SPD can be installed within a maximum distance of 0.5 m from the PEN separation point.<a class=\"tncs-ref\" href=\"#tncs-reference-4\">[4]<\/a><\/p>\r\n      <p>This is a manufacturer application example with defined conditions. Do not use the distance alone to approve a global TN-C-S wiring rule. Confirm the national standard, ownership boundary, product documentation and project drawing.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-pole-selection\">\r\n    <h2 id=\"tncs-pole-selection\"><span class=\"ez-toc-section\" id=\"3p-4p-or-3pn-what-must-the-buyer-verify\"><\/span>3P, 4P or 3P+N: What Must the Buyer Verify?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The number of visible modules does not always explain how the SPD is connected internally.<\/p>\r\n\r\n    <div class=\"tncs-table-wrap\">\r\n      <p class=\"tncs-table-note\">Supplier terminology can vary. The internal circuit diagram is the controlling document.<\/p>\r\n\r\n      <table class=\"tncs-mobile-cards\">\r\n        <thead>\r\n          <tr>\r\n            <th scope=\"col\">Description<\/th>\r\n            <th scope=\"col\">Possible meaning<\/th>\r\n            <th scope=\"col\">Verification required<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>3P SPD<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Three protective poles, often used for 3+0.<\/td>\r\n            <td data-label=\"Verify\">Whether the paths are L-PEN or L-PE and which network type is approved.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>4P SPD<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Four protective poles, often used for 4+0.<\/td>\r\n            <td data-label=\"Verify\">How L1, L2, L3, N and PE connect inside the product.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>3P+N<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Often used commercially for a 3+1 product.<\/td>\r\n            <td data-label=\"Verify\">Whether it contains three L-N paths and a dedicated N-PE protection element.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>3+0<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Three active-conductor-to-reference protection modes.<\/td>\r\n            <td data-label=\"Verify\">Whether the reference is PEN or PE and whether the network application is approved.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>4+0<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Four active-conductor-to-PE protection modes.<\/td>\r\n            <td data-label=\"Verify\">Uc, Up, TOV behaviour, leakage characteristics and TN-S application approval.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Description\"><strong>3+1<\/strong><\/td>\r\n            <td data-label=\"Possible meaning\">Three L-N protection modes plus one N-PE mode.<\/td>\r\n            <td data-label=\"Verify\">The N-PE technology, discharge rating, Uc and combined L-PE protection level.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"tncs-table-conclusion\">Request the internal circuit diagram, datasheet and installation instruction before model approval.<\/p>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-neutral-earth\">\r\n    <h2 id=\"tncs-neutral-earth\"><span class=\"ez-toc-section\" id=\"how-should-n-and-pe-be-handled-after-the-split\"><\/span>How Should N and PE Be Handled After the Split?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>After the approved separation point, N carries normal load return current. PE provides protective bonding and fault-current paths.<\/p>\r\n\r\n    <p>A designed N-PE protection element inside an SPD is not the same as a permanent copper bridge between the neutral and PE bars.<\/p>\r\n\r\n    <div class=\"tncs-two-column\">\r\n      <div class=\"tncs-mini-panel tncs-do\">\r\n        <h3>Correct checks<\/h3>\r\n        <ul>\r\n          <li>Keep the downstream N and PE bars separate.<\/li>\r\n          <li>Follow the selected SPD wiring diagram.<\/li>\r\n          <li>Use a short, direct PE connection.<\/li>\r\n          <li>Bond the enclosure according to the approved design.<\/li>\r\n          <li>Check neutral isolation where required.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-mini-panel tncs-dont\">\r\n        <h3>Common errors<\/h3>\r\n        <ul>\r\n          <li>Adding a permanent N-PE link at the SPD.<\/li>\r\n          <li>Using an SPD terminal as the neutral bar.<\/li>\r\n          <li>Continuing to label downstream PE as PEN.<\/li>\r\n          <li>Reconnecting N and PE in a sub-distribution board.<\/li>\r\n          <li>Assuming every neutral module is an N-PE element.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <p>An unintended N-PE connection can alter current paths and affect protective-device operation. The final bonding arrangement must match the approved earthing design.<\/p>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-installation-details\">\r\n    <h2 id=\"tncs-installation-details\"><span class=\"ez-toc-section\" id=\"installation-details-that-affect-real-spd-performance\"><\/span>Installation Details That Affect Real SPD Performance<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <h3>Keep the connection path short<\/h3>\r\n\r\n    <p>Long conductors add inductive voltage during a surge. The voltage reaching the equipment can therefore be higher than the SPD\u2019s stated Up value alone suggests.<\/p>\r\n\r\n    <p>Weidm\u00fcller\u2019s official installation guidance states that SPD connecting lines should be no longer than 0.5 m and explains that V-connection can reduce additional conductor voltage.<a class=\"tncs-ref\" href=\"#tncs-reference-6\">[6]<\/a><\/p>\r\n\r\n    <ul>\r\n      <li>Place the SPD close to the incoming conductors and PE or PEN bar.<\/li>\r\n      <li>Avoid loops, detours and unnecessary bends.<\/li>\r\n      <li>Do not place the SPD at the far end of the DIN rail only because space is available.<\/li>\r\n      <li>Confirm whether V-connection or branch wiring is approved for the model.<\/li>\r\n    <\/ul>\r\n\r\n    <h3>Coordinate backup protection and short-circuit capability<\/h3>\r\n\r\n    <p>The upstream overcurrent protective device, SPD branch conductors and SPD short-circuit capability must be evaluated together.<\/p>\r\n\r\n    <p>Weidm\u00fcller states that additional backup protection is needed when the system-side protective device exceeds the maximum value specified for the SPD.<a class=\"tncs-ref\" href=\"#tncs-reference-6\">[6]<\/a> DEHN also notes that the required Isccr must be at least equal to the short-circuit current at the point of connection.<a class=\"tncs-ref\" href=\"#tncs-reference-4\">[4]<\/a><\/p>\r\n\r\n    <ul>\r\n      <li>Prospective short-circuit current at the installation point.<\/li>\r\n      <li>SPD Isccr or stated short-circuit capability.<\/li>\r\n      <li>Maximum permitted backup fuse or circuit breaker.<\/li>\r\n      <li>Upstream protective-device type and rating.<\/li>\r\n      <li>Branch conductor cross-section and routing.<\/li>\r\n      <li>Whether backup protection is integrated.<\/li>\r\n    <\/ul>\r\n\r\n    <h3>Check all electrical ratings<\/h3>\r\n\r\n    <p>The correct protection circuit does not automatically mean the electrical ratings are correct.<\/p>\r\n\r\n    <ul>\r\n      <li><strong>Uc:<\/strong> maximum continuous operating voltage.<\/li>\r\n      <li><strong>Up:<\/strong> voltage protection level.<\/li>\r\n      <li><strong>In, Imax or Iimp:<\/strong> according to the SPD classification and application.<\/li>\r\n      <li><strong>TOV behaviour:<\/strong> performance during temporary power-frequency overvoltage.<\/li>\r\n      <li><strong>N-PE ratings:<\/strong> where a dedicated N-PE protection mode is used.<\/li>\r\n    <\/ul>\r\n\r\n    <p>IEC 60364-5-53 includes the selection and erection requirements for protective devices in low-voltage installations, including the SPD provisions in Clause 534.<a class=\"tncs-ref\" href=\"#tncs-reference-5\">[5]<\/a> IEC 61643-11:2025 provides requirements and test methods for SPDs connected to AC low-voltage systems.<a class=\"tncs-ref\" href=\"#tncs-reference-8\">[8]<\/a><\/p>\r\n\r\n    <h3>Confirm RCD coordination<\/h3>\r\n\r\n    <p>RCD position and immunity depend on the network, SPD circuit, leakage behaviour, RCD type, selectivity requirements and national rules.<\/p>\r\n\r\n    <p>Do not apply one universal RCD arrangement to every TN-C-S project. Review the complete protection diagram and the instructions for both devices.<\/p>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-broken-pen\">\r\n    <h2 id=\"tncs-broken-pen\"><span class=\"ez-toc-section\" id=\"does-an-spd-protect-against-a-broken-pen\"><\/span>Does an SPD Protect Against a Broken PEN?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>No. A standard SPD is not a complete open-PEN protection device.<\/strong><\/p>\r\n\r\n    <p>An SPD limits transient overvoltages. A broken PEN is a power-frequency network fault that can cause neutral displacement, diverted current and dangerous touch voltage.<\/p>\r\n\r\n    <p>The IET explains that an open PEN can place hazardous voltage on bonded metalwork and can produce overvoltage on some loads and undervoltage on others.<a class=\"tncs-ref\" href=\"#tncs-reference-7\">[7]<\/a><\/p>\r\n\r\n    <div class=\"tncs-warning-box\">\r\n      <h3>Do not confuse two different protection functions<\/h3>\r\n      <ul>\r\n        <li><strong>SPD:<\/strong> limits lightning-related and switching transient overvoltages.<\/li>\r\n        <li><strong>Open-PEN protection:<\/strong> detects, disconnects or otherwise controls a dangerous PEN fault according to the applicable design rules.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-common-mistakes\">\r\n    <h2 id=\"tncs-common-mistakes\"><span class=\"ez-toc-section\" id=\"seven-common-tn-c-s-spd-mistakes\"><\/span>Seven Common TN-C-S SPD Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <ol class=\"tncs-steps\">\r\n      <li><strong>Selecting from \u201cTN-C-S\u201d alone.<\/strong> The system name does not show which side of the PEN split contains the SPD.<\/li>\r\n      <li><strong>Using a TN-S-only SPD on the TN-C section.<\/strong> A product designed for separate N and PE should not automatically be connected to PEN.<\/li>\r\n      <li><strong>Assuming every TN-C-S project requires 3+1.<\/strong> Approved TN-S solutions may use 4+0 or 3+1 depending on the design.<\/li>\r\n      <li><strong>Assuming every four-module SPD is 3+1.<\/strong> The internal circuit may instead be 4+0.<\/li>\r\n      <li><strong>Adding a downstream N-PE bridge.<\/strong> This changes the intended earthing arrangement.<\/li>\r\n      <li><strong>Ignoring connection length and backup protection.<\/strong> Both can change the effective protection and panel approval.<\/li>\r\n      <li><strong>Treating the SPD as open-PEN protection.<\/strong> These devices address different electrical risks.<\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-selection-workflow\">\r\n    <h2 id=\"tncs-selection-workflow\"><span class=\"ez-toc-section\" id=\"tn-c-s-spd-engineering-selection-workflow\"><\/span>TN-C-S SPD Engineering Selection Workflow<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The decision process should begin with the electrical drawing\u2014not with the supplier\u2019s module count.<\/p>\r\n\r\n    <figure class=\"tncs-figure\">\r\n      <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/tn-c-s-spd-engineering-selection-workflow.webp\" alt=\"Engineering workflow for selecting an SPD in a TN-C-S system based on the PEN separation point\" width=\"1448\" height=\"1086\" loading=\"lazy\" decoding=\"async\">\r\n      <figcaption>Start with the single-line diagram and PEN separation point. Confirm the protection circuit before checking the SPD Type, electrical ratings, short-circuit coordination and documentation.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <ol class=\"tncs-steps\">\r\n      <li><strong>Locate the PEN separation point.<\/strong> Mark it clearly on the single-line diagram.<\/li>\r\n      <li><strong>Identify the proposed SPD position.<\/strong> Confirm whether it is on the TN-C section or separated TN-S section.<\/li>\r\n      <li><strong>Approve the internal circuit.<\/strong> Verify 3+0, 4+0 or 3+1 from the product documentation.<\/li>\r\n      <li><strong>Confirm the SPD classification and ratings.<\/strong> Check Type, Uc, Up, In, Imax, Iimp where applicable and TOV behaviour.<\/li>\r\n      <li><strong>Coordinate the installation.<\/strong> Check Isccr, backup protection, conductor routing, connection length and terminal requirements.<\/li>\r\n      <li><strong>Record the approved model.<\/strong> Keep the datasheet, wiring diagram, certificate scope and replacement reference in the panel documentation.<\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-ordering-checklist\">\r\n    <h2 id=\"tncs-ordering-checklist\"><span class=\"ez-toc-section\" id=\"what-should-be-confirmed-before-ordering\"><\/span>What Should Be Confirmed Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"tncs-checklist\">\r\n      <h3>Panel and OEM enquiry checklist<\/h3>\r\n      <ul>\r\n        <li>Country and applicable installation standard.<\/li>\r\n        <li>Nominal system voltage.<\/li>\r\n        <li>Single-phase or three-phase supply.<\/li>\r\n        <li>Incoming conductor arrangement.<\/li>\r\n        <li>Exact PEN separation point.<\/li>\r\n        <li>Proposed SPD installation position.<\/li>\r\n        <li>Marked single-line diagram.<\/li>\r\n        <li>Required SPD Type.<\/li>\r\n        <li>Required 3+0, 4+0 or 3+1 circuit.<\/li>\r\n        <li>Uc, Up and discharge-current requirements.<\/li>\r\n        <li>Prospective short-circuit current.<\/li>\r\n        <li>Upstream protective-device rating.<\/li>\r\n        <li>Remote signalling requirement.<\/li>\r\n        <li>Certificate or test-report requirement.<\/li>\r\n        <li>Quantity, label and packaging requirements.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <p><strong>A marked single-line diagram is more useful than the sentence \u201cwe need a four-pole SPD for TN-C-S.\u201d<\/strong><\/p>\r\n  <\/section>\r\n\r\n  <section class=\"tncs-cta\" aria-labelledby=\"tncs-configuration-review\">\r\n    <h2 id=\"tncs-configuration-review\"><span class=\"ez-toc-section\" id=\"need-to-confirm-a-tn-c-s-spd-configuration\"><\/span>Need to Confirm a TN-C-S SPD Configuration?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>Send the system voltage, PEN separation point, proposed SPD location, short-circuit level and single-line diagram. LEEYEE can review the required protection circuit and prepare a model-confirmation list for panel, distribution or OEM projects.<\/p>\r\n    <a href=\"javascript:void(0);\" class=\"leeyee-site-popup-btn\"><span>Share Your System Details for Review<\/span><\/a>\r\n    <p class=\"tncs-brand-note\">LEEYEE is a specialized surge protection and low-voltage protection supplier. CNSPD is LEEYEE\u2019s surge protection-focused platform for global technical buyers. Built to Protect. Trusted to Last.<\/p>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-faq\">\r\n    <h2 id=\"tncs-faq\"><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"tncs-faq\">\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>Can a 3P SPD be used in a TN-C-S system?<\/h3>\r\n        <p>Yes, when it is installed on the TN-C section and is explicitly approved for connection from L1, L2 and L3 to PEN.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>Must the SPD always be installed after PEN separation?<\/h3>\r\n        <p>No. Customer-side SPDs are often installed after separation, but an approved TN-C SPD may be used before the split where the project and local rules permit it.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>Does every TN-C-S system require a 3+1 SPD?<\/h3>\r\n        <p>No. After separation, approved TN-S solutions may use 4+0 or 3+1 depending on the product, project and applicable rules.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>Is a 4P SPD the same as a 3P+N SPD?<\/h3>\r\n        <p>Not necessarily. A 4P SPD may use a 4+0 circuit, while a 3P+N product may use three L-N paths plus a dedicated N-PE element.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>Can N and PE be linked at the SPD?<\/h3>\r\n        <p>Do not add a new permanent N-PE bridge after the approved PEN separation point. Use the designed protection modes inside an approved SPD.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"tncs-faq-item\">\r\n        <h3>What is the most useful document for model selection?<\/h3>\r\n        <p>A marked single-line diagram showing the PEN split, SPD position, conductor arrangement and upstream protection.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section aria-labelledby=\"tncs-related-guides\">\r\n    <h2 id=\"tncs-related-guides\"><span class=\"ez-toc-section\" id=\"related-technical-guides\"><\/span>Related Technical Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"tncs-related\">\r\n      <ul>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/tn-s-system-spd-wiring\/\">TN-S System SPD Wiring Guide<\/a> \u2014 for protection points where N and PE are already separate.<\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/tt-system-spd\/\">TT System SPD Guide<\/a> \u2014 for TT earthing and N-PE protection decisions.<\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/3pn-spd-vs-4p-spd\/\">3P+N SPD vs 4P SPD<\/a> \u2014 for a focused comparison of 3+1 and 4+0 circuits.<\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/three-phase-spd-wiring-diagram\/\">Three-Phase SPD Wiring Diagram<\/a> \u2014 for general three-phase panel wiring principles.<\/li>\r\n        <li><a href=\"https:\/\/www.cnspd.com\/iec-60364-5-534-spd-installation\/\">IEC 60364-5-534 SPD Installation Guide<\/a> \u2014 for conductor length, backup protection and installation coordination.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"tncs-references\" aria-labelledby=\"tncs-references\">\r\n    <h2 id=\"tncs-references\"><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <ol>\r\n      <li id=\"tncs-reference-1\">\r\n        International Electrotechnical Commission, <em>IEC 60364-1:2025 \u2014 Low-voltage electrical installations \u2014 Part 1: Fundamental principles, assessment of general characteristics, and definitions<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/63699\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-2\">\r\n        Schneider Electric UK, <em>Would it be possible to install a TNS SPD on a TN-C-S network?<\/em>, FAQ000270719. The document distinguishes the TN-C and TN-S parts of a TN-C-S network.\r\n        <a href=\"https:\/\/www.se.com\/uk\/en\/faqs\/FAQ000270719\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric FAQ<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-3\">\r\n        DEHN, <em>Increased Safety for Switchgear Cabinets<\/em>. The published application information includes a TN-C 3+0 sample, a TN-S 4+0 sample and 3+1 products identified for TT and TN-S systems.\r\n        <a href=\"https:\/\/www.dehn-international.com\/sites\/default\/files\/media\/files\/Increased-Safety-for-Switchgear-Cabinets_DS196_E.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official DEHN technical document<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-4\">\r\n        DEHN, <em>Surge Protection in Low-Voltage Switchgear Assemblies<\/em>, WPX004\/E. The white paper discusses conductor voltage drop, Isccr and a defined 3+0 application near a PEN separation point.\r\n        <a href=\"https:\/\/www.dehn-international.com\/sites\/default\/files\/media\/files\/surge-protection-low-voltage-switchgear-assemblies-wpx004-e.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official DEHN white paper<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-5\">\r\n        International Electrotechnical Commission, <em>IEC 60364-5-53:2019+AMD1:2020+AMD2:2024 CSV \u2014 Low-voltage electrical installations \u2014 Part 5-53: Selection and erection of electrical equipment<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/104394\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC consolidated-version page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-6\">\r\n        Weidm\u00fcller, <em>Installation Information and Requirements \u2014 Lightning and Surge Protection in Energy Systems<\/em>. The guidance covers qualified installation, SPD location, connecting-line length, V-connection and backup protection.\r\n        <a href=\"https:\/\/www.weidmuller.com.sg\/en\/products\/electronics\/lightning_and_surge_protection\/installation_guidance.jsp\" target=\"_blank\" rel=\"noopener noreferrer\">Official Weidm\u00fcller guidance<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-7\">\r\n        The Institution of Engineering and Technology, <em>Broken PEN<\/em>, Wiring Matters. The article explains diverted neutral current, dangerous touch voltage and voltage displacement associated with an open PEN.\r\n        <a href=\"https:\/\/electrical.theiet.org\/wiring-matters\/years\/2021\/84-march-2021\/broken-pen\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official IET article<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"tncs-reference-8\">\r\n        International Electrotechnical Commission, <em>IEC 61643-11:2025 \u2014 Low-voltage surge protective devices \u2014 Part 11: Surge protective devices connected to AC low-voltage power systems \u2014 Requirements and test methods<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>TN-C-S SPD wiring depends first on the PEN separation point\u2014not only on whether a product is described as 3P, 4P or 3P+N. This guide helps panel builders, electrical contractors, consultants, distributors and OEM buyers determine whether the SPD will be installed on the TN-C section or on the separated TN-S section. Safety note: SPD installation&#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-30380","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>TN-C-S System SPD Wiring: 3P, 4P or 3P+N Guide<\/title>\n<meta name=\"description\" content=\"Learn how to select and wire an SPD before or after PEN separation in a TN-C-S system, including 3P, 4P, 3+0, 4+0 and 3+1 options.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TN-C-S System SPD Wiring: 3P, 4P or 3P+N Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to select and wire an SPD before or after PEN separation in a TN-C-S system, including 3P, 4P, 3+0, 4+0 and 3+1 options.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/tn-c-s-system-spd-wiring\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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