{"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":"2023-07-10T11:13:06","modified_gmt":"2023-07-10T10:13:06","slug":"systemes-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\/systemes-tt\/","title":{"rendered":"Syst\u00e8mes 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                    Syst\u00e8mes 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 syst\u00e8mes 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<p>Le point neutre ou le point m\u00e9dian du syst\u00e8me d&rsquo;alimentation \u00e9lectrique doit \u00eatre mis \u00e0 la terre. Si un point neutre ou un point m\u00e9dian n&rsquo;est pas disponible ou n&rsquo;est pas accessible, un conducteur de ligne 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                    Syst\u00e8mes 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                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1-150x150.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"226\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"226\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"226\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/correct-300x226-1.webp\"\r\n                                                        title=\"correct-300&#215;226\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\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 syst\u00e8mes TT, la liaison des parties conductrices expos\u00e9es a pour but de cr\u00e9er une boucle de d\u00e9faut. Par rapport \u00e0 un syst\u00e8me TN, dans un syst\u00e8me 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] 411.5.2 En g\u00e9n\u00e9ral, dans les syst\u00e8mes TT, les RCD doivent \u00eatre utilis\u00e9s pour la protection contre les d\u00e9fauts. Alternativement, des dispositifs de protection contre les surintensit\u00e9s peuvent \u00eatre utilis\u00e9s pour la protection contre les d\u00e9fauts \u00e0 condition qu&rsquo;une valeur suffisamment basse de Zs (voir 411.5.4) soit assur\u00e9e de fa\u00e7on 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 RCD, 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                    <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                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/telecharger-150x150.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"87\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/telecharger-300x87.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"224\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/telecharger-768x224.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 933px)\"\r\n                                width=\"933\"\r\n                                height=\"272\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/telecharger.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/telecharger.png.webp\"\r\n                                                        title=\"t\u00e9l\u00e9charger\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\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>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<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","protected":false},"excerpt":{"rendered":"<p>Dans les syst\u00e8mes 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 v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Syst\u00e8mes TT - Gt-Engineering<\/title>\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.gt-engineering.it\/fr\/reglements-techniques\/normes-iec\/iec-60364-4-41-protection-contre-les-chocs-elec\/systemes-tt\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Syst\u00e8mes TT - Gt-Engineering\" \/>\n<meta property=\"og:description\" content=\"Dans les syst\u00e8mes 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.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-iec\/iec-60364-4-41-protection-contre-les-chocs-elec\/systemes-tt\/\" \/>\n<meta property=\"og:site_name\" content=\"Gt-Engineering\" \/>\n<meta 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