{"id":37336,"date":"2023-01-04T17:57:54","date_gmt":"2023-01-04T16:57:54","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=37336"},"modified":"2026-09-29T07:13:24","modified_gmt":"2026-09-29T06:13:24","slug":"schema-tt","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-iec\/iec-60364-4-41-protection-contre-les-chocs-elec\/schema-tt\/","title":{"rendered":"Sch\u00e9ma TT"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n                    <div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n                \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h2 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Sch\u00e9ma TT : les bases    <\/h2>\n        <\/div>\n                <\/div>\n        \n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Dans les Sch\u00e9mas TT, Toutes les masses prot\u00e9g\u00e9es collectivement par un m\u00eame dispositif de protection doivent \u00eatre connect\u00e9es aux conducteurs de protection et reli\u00e9es \u00e0 une m\u00eame prise de terre.<br \/>\nSi plusieurs dispositifs de protection sont mont\u00e9s en s\u00e9rie, cette exigence s&rsquo;applique s\u00e9par\u00e9ment \u00e0 toutes les masses prot\u00e9g\u00e9es par le m\u00eame dispositif.<br \/>\nLe neutre ou le point milieu de l\u2019alimentation doit \u00eatre mis \u00e0 la terre. Si le neutre ou le point milieu n\u2019existe pas ou n\u2019est pas accessible, un conducteur actif doit \u00eatre mis \u00e0 la terre.<\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n                    <div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n                \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h2 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Sch\u00e9ma TT : comment la s\u00e9curit\u00e9 est-elle garantie ?    <\/h2>\n        <\/div>\n                <\/div>\n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9 float-left mr-6 md:mr-4 lg:mr-8 xl:mr-9  overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \n\n    \n        \n            \n                \n                    <picture\n                        class=\"\"\n                                            >\n                                                                                                        <source\n                                media=\"(max-width: 150px)\"\n                                width=\"150\"\n                                height=\"150\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1-150x150.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 300px)\"\n                                width=\"300\"\n                                height=\"226\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 300px)\"\n                                width=\"300\"\n                                height=\"226\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 300px)\"\n                                width=\"300\"\n                                height=\"226\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                            <img\n                            class=\"a-image transparent border-image h-auto  w-full\"\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\n                                                        width=\"300\"\n                            height=\"226\"\n                                                                                    title=\"correct-300&#215;226\"\n                                                        type=\"image\/webp\"\n                            loading=\"eager\" fetchpriority=\"high\" decoding=\"async\"                        \/>\n                    <\/picture>\n\n                \n\n                    \n    \n\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Essentiellement, m\u00eame dans les sch\u00e9ma TT, la liaison des parties conductrices expos\u00e9es a pour but de cr\u00e9er une boucle de d\u00e9faut. Par rapport \u00e0 un sch\u00e9ma TN, dans un sch\u00e9ma TT, la boucle de d\u00e9faut est en partie constitu\u00e9e d&rsquo;une \u00ab\u00a0masse au sol\u00a0\u00bb. Le probl\u00e8me est que la valeur du courant de d\u00e9faut d\u00e9pend de la r\u00e9sistance de la \u00ab\u00a0masse au sol\u00a0\u00bb. En Italie, la r\u00e9sistance peut \u00eatre tr\u00e8s \u00e9lev\u00e9e (par exemple 100\u03a9). Aux Pays-Bas, en particulier dans les polders, la r\u00e9sistance peut \u00eatre relativement faible (quelques ohms). Cette consid\u00e9ration est importante.<\/p>\n<p>En g\u00e9n\u00e9ral, la norme autorise l&rsquo;utilisation de dispositifs de protection contre les courants r\u00e9siduels (RCD) ou contre les surintensit\u00e9s (comme les disjoncteurs miniatures).<\/p>\n<blockquote><p><em>[IEC 60364-4-41] <strong>411.5 Sch\u00e9ma TT.<\/strong> <\/em><\/p>\n<p><em><strong>411.5.2<\/strong> En g\u00e9n\u00e9ral, pour le sch\u00e9ma TT, les dispositifs diff\u00e9rentiels (DDR) doivent \u00eatre utilis\u00e9s pour la protection en cas de d\u00e9faut. Autrement, des dispositifs de protection contre les surintensit\u00e9s peuvent \u00eatre utilis\u00e9s pour la protection en cas de d\u00e9faut si une valeur faible appropri\u00e9e de Zs (voir 411.5.4) est assur\u00e9e de mani\u00e8re permanente et fiable.<\/em><\/p><\/blockquote>\n<p>En Italie, l&rsquo;utilisation d&rsquo;un DDR est obligatoire.<\/p>\n<p>En cas d&rsquo;utilisation d&rsquo;un DDR, les personnes sont prot\u00e9g\u00e9es contre les chocs \u00e9lectriques en s&rsquo;assurant que la tension maximale qu&rsquo;une personne peut toucher n&rsquo;est pas sup\u00e9rieure \u00e0 50 Vca.<\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n        \n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Il est \u00e9galement important de noter que, dans le cas o\u00f9 la mesure de la r\u00e9sistance de terre des locaux (RA sur l&rsquo;image) est difficile, la norme autorise l&rsquo;utilisation de l&rsquo;imp\u00e9dance de la boucle de d\u00e9faut (c&rsquo;est-\u00e0-dire \u2248 RA + RN) :<\/p>\n<blockquote><p><em>[IEC 60364-4-41] <strong>411.5 Sch\u00e9ma TT.<\/strong><\/em><\/p>\n<p><em>411.5.3 Si un DDR est utilis\u00e9 pour la protection en cas de d\u00e9faut, la condition suivante doit \u00eatre satisfaite:<\/em><br \/>\n<em>i) le temps de coupure respecte 411.3.2.2 ou 411.3.2.4, et<\/em><br \/>\n<em>ii) RA x I\u0394n \u2264 50 V<\/em><br \/>\n<em>o\u00f9<\/em><br \/>\n<em>&#8211; RA est la somme des r\u00e9sistances en \u03a9 de la prise de terre et du conducteur de <\/em><em>protection de mise \u00e0 la terre des masses,<\/em><br \/>\n<em>&#8211; I\u0394n est le courant diff\u00e9rentiel-r\u00e9siduel assign\u00e9 du dispositif de protection.<\/em><\/p><\/blockquote>\n<p>La raison pour laquelle la tension est limit\u00e9e \u00e0 50 Vca est que pour des tensions &lt; 50 Vca, le courant traversant le corps n&rsquo;est pas dangereux.<\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n                    <div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n                \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h2 class=\"a-heading text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Le Sch\u00e9ma TT en Am\u00e9rique du Nord    <\/h2>\n        <\/div>\n                <\/div>\n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9  float-right ml-6 md:ml-4 lg:ml-8 xl:ml-9 overflow-hidden shadow-content-image w-full md:w-1\/4\"\n            >\n                \n\n    \n        \n            \n                \n                    <picture\n                        class=\"\"\n                                            >\n                                                                                                        <source\n                                media=\"(max-width: 150px)\"\n                                width=\"150\"\n                                height=\"150\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Screenshot-2026-09-28-160851-1-150x150.png.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 180px)\"\n                                width=\"180\"\n                                height=\"300\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Screenshot-2026-09-28-160851-1-180x300.png.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 410px)\"\n                                width=\"410\"\n                                height=\"685\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Screenshot-2026-09-28-160851-1.png.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                                <source\n                                media=\"(max-width: 410px)\"\n                                width=\"410\"\n                                height=\"685\"\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Screenshot-2026-09-28-160851-1.png.webp\"\n                                type=\"image\/webp\"\n                            \/>\n                                                                            <img\n                            class=\"a-image transparent border-image h-auto  w-full\"\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Screenshot-2026-09-28-160851-1.png.webp\"\n                                                        width=\"410\"\n                            height=\"685\"\n                                                                                    title=\"Screenshot 2026-09-28 160851\"\n                                                        type=\"image\/webp\"\n                            loading=\"lazy\" fetchpriority=\"auto\" decoding=\"async\"                        \/>\n                    <\/picture>\n\n                \n\n                    \n    \n\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <div>\n<p>Le Sch\u00e9ma <b>TT<\/b> est largement utilis\u00e9 en Europe et dans de nombreuses autres r\u00e9gions du monde, alors qu&rsquo;il n&rsquo;est g\u00e9n\u00e9ralement pas utilis\u00e9 dans les r\u00e9seaux d&rsquo;alimentation r\u00e9sidentiels traditionnels des <b>\u00c9tats-Unis et du Canada<\/b>, o\u00f9 l&rsquo;on adopte g\u00e9n\u00e9ralement une architecture correspondant, selon la terminologie CEI, \u00e0 un sch\u00e9ma <b>TN-C-S<\/b>.<\/p>\n<p>La principale diff\u00e9rence concerne le <b>cheminement du courant de d\u00e9faut vers la terre<\/b> et le principe de protection qui en d\u00e9coule. Dans les r\u00e9seaux d&rsquo;alimentation r\u00e9sidentiels nord-am\u00e9ricains, le neutre (<i>grounded conductor<\/i>) est reli\u00e9 au sch\u00e9ma des conducteurs de protection au niveau du <b>service equipment<\/b>. En aval de ce point, le neutre et les conducteurs de protection sont maintenus s\u00e9par\u00e9s. Dans le <b>National Electrical Code (NEC)<\/b>, cette connexion est appel\u00e9e <em>sch\u00e9ma<\/em><i>\u00a0bonding jumper<\/i>.<\/p>\n<p>La connexion entre le neutre et le sch\u00e9ma de protection permet de cr\u00e9er un <b>chemin m\u00e9tallique \u00e0 faible imp\u00e9dance<\/b> pour le courant de d\u00e9faut, lui permettant de revenir \u00e0 la source et d\u2019atteindre des valeurs suffisantes pour d\u00e9clencher les protections contre les surintensit\u00e9s.<\/p>\n<p>Dans le <b>Sch\u00e9ma TT<\/b>, en revanche, le courant de d\u00e9faut doit traverser le <b>sol<\/b> pour revenir \u00e0 la source, en passant par les prises de terre de l\u2019installation et de la source. La r\u00e9sistance de terre limite donc le courant de d\u00e9faut, qui peut s\u2019av\u00e9rer insuffisant pour d\u00e9clencher les protections contre les surintensit\u00e9s dans le d\u00e9lai requis.<\/p>\n<p>C\u2019est pourquoi, dans les Sch\u00e9ma <b>TT<\/b>, la protection contre les d\u00e9fauts repose g\u00e9n\u00e9ralement sur l\u2019utilisation de <b>dispositifs diff\u00e9rentiels (RCD)<\/b>. Leur courant diff\u00e9rentiel nominal de d\u00e9clenchement doit \u00eatre coordonn\u00e9 avec la <b>r\u00e9sistance de terre de l\u2019installation<\/b> et avec les exigences relatives au temps de coupure.<\/p>\n<p>Une autre diff\u00e9rence concerne la protection des personnes : en Am\u00e9rique du Nord, les <b>GFCI de classe A<\/b> utilis\u00e9s \u00e0 cette fin se d\u00e9clenchent g\u00e9n\u00e9ralement dans une plage de <b>4 \u00e0 6 mA<\/b>, tandis que dans les installations europ\u00e9ennes, on utilise des disjoncteurs diff\u00e9rentiels (RCD) dont les courants diff\u00e9rentiels nominaux peuvent \u00eatre nettement plus \u00e9lev\u00e9s, en fonction de la protection sp\u00e9cifique requise.<\/p>\n<\/div>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>Dans les sch\u00e9mas TT, toutes les parties conductrices expos\u00e9es, prot\u00e9g\u00e9es collectivement par le m\u00eame dispositif de protection, doivent \u00eatre reli\u00e9es par les conducteurs de protection \u00e0 une \u00e9lectrode de terre commune \u00e0 toutes ces parties.<\/p>\n","protected":false},"author":182,"featured_media":37334,"parent":37153,"menu_order":4,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[165],"class_list":["post-37336","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-iec"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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