{"id":35966,"date":"2023-02-22T11:41:34","date_gmt":"2023-02-22T10:41:34","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=approfondimento&#038;p=35966"},"modified":"2025-02-05T21:12:56","modified_gmt":"2025-02-05T20:12:56","slug":"sept-raisons-de-raccorder-ou-de-mettre-a-la-terre-une-piece-metallique","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/sept-raisons-de-raccorder-ou-de-mettre-a-la-terre-une-piece-metallique\/","title":{"rendered":"Sept raisons de raccorder ou de mettre \u00e0 la terre une pi\u00e8ce m\u00e9tallique"},"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        \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><strong>LE DOUTE :<\/strong><\/p>\n<p>Pourquoi une pi\u00e8ce m\u00e9tallique doit-elle \u00eatre connect\u00e9e \u00e0 un c\u00e2ble PE (Protection Earth) ?<\/p>\n<p><strong>CONSID\u00c9RATIONS :<\/strong><\/p>\n<p>Il y a 7 raisons pour lesquelles une pi\u00e8ce m\u00e9tallique doit \u00eatre reli\u00e9e : voyons-les une par une.<\/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                    1. Raccordement de la masse    <\/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\/02\/Anello-di-Guasto-150x150.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"196\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/02\/Anello-di-Guasto-300x196.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"502\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/02\/Anello-di-Guasto-768x502.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"669\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/02\/Anello-di-Guasto-1024x669.jpg.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\/02\/Anello-di-Guasto.jpg.webp\"\r\n                                                        title=\"Anello di Guasto\"\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>Une<strong> masse<\/strong> est une pi\u00e8ce m\u00e9tallique appartenant \u00e0 un syst\u00e8me \u00e9lectrique (par exemple la carcasse m\u00e9tallique d&rsquo;un moteur) qui peut \u00eatre mise sous tension en cas de d\u00e9faillance du syst\u00e8me \u00e9lectrique.<\/p>\n<p>Par exemple, une isolation insuffisante des enroulements du stator du moteur peut entra\u00eener la mise sous tension de la carcasse du moteur : dans ce cas, la carcasse prend une tension \u00e0 la terre qui d\u00e9pend de la tension nominale de la distribution \u00e9lectrique. Par exemple, un moteur de 460 volts CA (c&rsquo;est-\u00e0-dire une distribution \u00e9lectrique de 480Y\/277 V CA), en cas de<strong> d\u00e9faut de mise \u00e0 la terre<\/strong>, atteindra une tension \u00e0 la terre \u00e9gale \u00e0 277 V CA.<\/p>\n<p>Il s&rsquo;agit d&rsquo;une tension dangereuse et, si une personne touche le ch\u00e2ssis, elle est sujette \u00e0 un choc \u00e9lectrique. Afin d&rsquo;\u00e9viter des cons\u00e9quences irr\u00e9versibles, <strong>la carcasse du moteur doit \u00eatre reli\u00e9e \u00e0 la borne de mise \u00e0 la terre<\/strong> du tableau \u00e9lectrique \u00e0 l&rsquo;aide d&rsquo;un conducteur de mise \u00e0 la terre de l&rsquo;\u00e9quipement (EGC) ou d&rsquo;un c\u00e2ble PE.<\/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                    2. Raccordement des \u00e9l\u00e9ments conducteurs etrangers    <\/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\/06\/Capture231-150x150.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=\"195\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/Capture231-300x195.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 663px)\"\r\n                                width=\"663\"\r\n                                height=\"431\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/Capture231.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 663px)\"\r\n                                width=\"663\"\r\n                                height=\"431\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/Capture231.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\/Capture231.png.webp\"\r\n                                                        title=\"Capture231\"\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>Une <strong>pi\u00e8ce conductrice \u00e9trang\u00e8re<\/strong> est une pi\u00e8ce m\u00e9tallique n&rsquo;appartenant pas au syst\u00e8me \u00e9lectrique (par exemple un \u00e9changeur de chaleur dans une usine) qui peut introduire le potentiel de terre dans la zone o\u00f9 un op\u00e9rateur travaille.<\/p>\n<p><em>[IEC 61140 : 2016] 3 Termes et d\u00e9finitions &#8211; <strong>3.7 Partie conductrice \u00e9trang\u00e8re<\/strong><\/em><br \/>\n<em>Partie conductrice ne faisant pas partie de l&rsquo;installation \u00e9lectrique et susceptible d&rsquo;introduire un potentiel \u00e9lectrique, g\u00e9n\u00e9ralement le potentiel \u00e9lectrique d&rsquo;une terre locale.<\/em><\/p>\n<p>Si l&rsquo;op\u00e9rateur touche \u00e0 la fois le ch\u00e2ssis du moteur et l&rsquo;\u00e9changeur de chaleur, alors que le ch\u00e2ssis du moteur est soumis \u00e0 un d\u00e9faut de mise \u00e0 la terre, <strong>deux courants vont circuler \u00e0 travers la personne<\/strong> : le courant mains-pieds et le courant main-main \u00e0 travers l&rsquo;\u00e9l\u00e9ment conducteur \u00e9tranger (ExCP). <strong>La somme est un courant sup\u00e9rieur \u00e0 celui suppos\u00e9 pour les contacts indirects (mains-pieds uniquement).<\/strong><\/p>\n<p><strong>La personne se trouve donc dans une situation dangereuse !<\/strong> C&rsquo;est la raison pour laquelle l&rsquo;\u00e9changeur de chaleur doit \u00eatre rendu \u00e9quipotentiel avec le moteur, par exemple en les connectant ensemble au moyen d&rsquo;un <strong>conducteur de liaison de protection (PB).<\/strong><\/p>\n<p>En faisant cela, le le bo\u00eetier moteur moteur (ECP) et l&rsquo;\u00e9changeur de chaleur (ExCP) deviennent \u00e9quipotentiels et il n&rsquo;y a donc plus de courant circulant de main \u00e0 main vers l&rsquo;\u00e9changeur de chaleur. L&rsquo;effet \u00ab n\u00e9gatif \u00bb d\u00fb \u00e0 la pr\u00e9sence d&rsquo;un ExCP a \u00e9t\u00e9 \u00e9limin\u00e9. M\u00eame si la personne touche \u00e0 la fois le moteur et l&rsquo;ExCP, elle sera soumise au m\u00eame courant que si elle touchait uniquement le bo\u00eetier du moteur !<\/p>\n<p>Veuillez prendre en compte le fait que l&rsquo;\u00e9changeur de chaleur, s&rsquo;il n&rsquo;est pas reli\u00e9 \u00e0 la terre, <strong>n&rsquo;est pas susceptible d&rsquo;avoir une tension dangereuse<\/strong> en cas de d\u00e9faut de mise \u00e0 la terre du moteur. Cependant, il doit \u00eatre reli\u00e9 \u00e0 la terre car il s&rsquo;agit d&rsquo;un \u00e9l\u00e9ment conducteur \u00e9tranger.<\/p>\n<p>Cela prouve que la r\u00e8gle \u00ab relier toutes les pi\u00e8ces m\u00e9talliques susceptibles d&rsquo;\u00eatre mises sous tension \u00bb est une directive trompeuse : l&rsquo;\u00e9changeur de chaleur n&rsquo;assumera JAMAIS une tension dangereuse, <strong>MAIS il doit \u00eatre reli\u00e9 \u00e0 la terre !<\/strong><\/p>\n<p>Derni\u00e8re observation, qui aide \u00e0 comprendre qu&rsquo;est que c&rsquo;est une <strong>Partie conductrice \u00e9trang\u00e8re<\/strong>: une <strong>Partie conductrice \u00e9trang\u00e8re<\/strong> introduit un potentiel PAS une Tension (dangereuse)!<\/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        \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                    4. Mise \u00e0 la terre du syst\u00e8me de protection contre la foudre (LPS)    <\/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\/06\/7.4.jpg-150x150.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 291px)\"\r\n                                width=\"291\"\r\n                                height=\"300\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.4.jpg-291x300.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 302px)\"\r\n                                width=\"302\"\r\n                                height=\"311\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.4.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 302px)\"\r\n                                width=\"302\"\r\n                                height=\"311\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.4.jpg.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\/7.4.jpg.webp\"\r\n                                                        title=\"7.4.jpg\"\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>Un<strong> syst\u00e8me de protection contre la foudre<\/strong> (LPS) doit \u00eatre \u00ab\u00a0mis \u00e0 la terre\u00a0\u00bb afin de disperser le courant de foudre en toute s\u00e9curit\u00e9 vers la terre. La connexion est \u00e9galement appel\u00e9e syst\u00e8me de terminaison \u00e0 la terre.<\/p>\n<p>L&rsquo;objectif du syst\u00e8me de protection contre la foudre externe est de prot\u00e9ger la structure d&rsquo;un coup de foudre direct en fournissant un point de fixation privil\u00e9gi\u00e9 pour conduire et disperser le courant de foudre.<\/p>\n<p>Le LPS externe est destin\u00e9 \u00e0 intercepter les \u00e9clairs directs sur la structure, y compris les \u00e9clairs sur les c\u00f4t\u00e9s de la structure, et \u00e0 conduire le courant de foudre du point d&rsquo;impact \u00e0 la terre. Le LPS externe est \u00e9galement destin\u00e9 \u00e0 disperser ce courant dans la terre sans provoquer de dommages thermiques ou m\u00e9caniques, ni d&rsquo;\u00e9tincelles dangereuses susceptibles de d\u00e9clencher des incendies ou des explosions.<\/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                    5. Raccordement afin de r\u00e9duire les interf\u00e9rences \u00e9lectromagn\u00e9tiques    <\/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\/06\/7.5.jpg-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=\"241\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.5.jpg-1-300x241.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 397px)\"\r\n                                width=\"397\"\r\n                                height=\"319\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.5.jpg-1.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 397px)\"\r\n                                width=\"397\"\r\n                                height=\"319\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.5.jpg-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\/06\/7.5.jpg-1.webp\"\r\n                                                        title=\"7.5.jpg\"\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>La liaison peut <strong>r\u00e9duire les interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/strong>. L&rsquo;un des avantages impr\u00e9vus de l&rsquo;utilisation d&rsquo;un conduit m\u00e9tallique comme conducteur de mise \u00e0 la terre et comme chemin de c\u00e2bles est que tout bruit \u00e9lectrique \u00e9manant des conducteurs du syst\u00e8me \u00e9lectrique est supprim\u00e9. Le conduit agit comme un \u00e9cran pour le flux \u00e9lectromagn\u00e9tique, qui est pi\u00e9g\u00e9 \u00e0 l&rsquo;int\u00e9rieur de l&rsquo;\u00e9cran et ne rayonne pas \u00e0 l&rsquo;ext\u00e9rieur de l&rsquo;enceinte. Ceci est particuli\u00e8rement important dans les syst\u00e8mes \u00e9lectriques modernes o\u00f9 l&rsquo;utilisation de semi-conducteurs de puissance cr\u00e9e un flux de courant harmonique \u00e0 travers le syst\u00e8me ainsi que des entailles de tension de ligne, qui peuvent agir comme source de bruit par rayonnement des conducteurs de puissance \u00e9lectrique. Lorsque les conducteurs alimentant ces \u00e9quipements sont enferm\u00e9s dans une gaine m\u00e9tallique, ces interf\u00e9rences \u00e9lectromagn\u00e9tiques (EMI) sont automatiquement supprim\u00e9es.<\/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                    6. Raccordement afin de r\u00e9duire le risque de d\u00e9charges \u00e9lectrostatiques    <\/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\/06\/7.6.jpg-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=\"206\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.6.jpg-300x206.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"526\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.6.jpg-768x526.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 896px)\"\r\n                                width=\"896\"\r\n                                height=\"614\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.6.jpg.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\/7.6.jpg.webp\"\r\n                                                        title=\"7.6.jpg\"\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>L&rsquo;\u00e9lectricit\u00e9 statique est un risque bien connu, en particulier dans les lieux class\u00e9s (ATEX). Dans certaines circonstances, <strong>une d\u00e9charge d&rsquo;\u00e9lectricit\u00e9 statique peut cr\u00e9er l&rsquo;\u00e9tincelle qui d\u00e9clenche un incendie ou une explosion<\/strong>. L&rsquo;explosion qui a d\u00e9truit le Hindenburg, par exemple, aurait \u00e9t\u00e9 provoqu\u00e9e par l&rsquo;\u00e9lectricit\u00e9 statique. Par cons\u00e9quent, de nombreux processus\/op\u00e9rations industriels doivent \u00eatre soigneusement examin\u00e9s afin de minimiser la possibilit\u00e9 que l&rsquo;\u00e9lectricit\u00e9 statique d\u00e9clenche un incident d\u00e9vastateur.<\/p>\n<p>Afin de r\u00e9duire le risque d&rsquo;accumulation de charges \u00e9lectrostatiques, tous les \u00e9l\u00e9ments conducteurs et dissipateurs doivent \u00eatre reli\u00e9s entre eux et mis \u00e0 la terre. Cela garantit l&rsquo;existence d&rsquo;un chemin d&rsquo;imp\u00e9dance relativement faible vers la terre, de sorte que les charges \u00e9lectrostatiques sont automatiquement \u00e9vacu\u00e9es vers la terre. Veuillez noter que la r\u00e9sistance maximale garantissant la s\u00e9curit\u00e9 est d&rsquo;environ 1 M\u03a9 !<\/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                    7. Raccordement des circuits de commande aliment\u00e9s par des transformateurs ou des alimentations en courant continu    <\/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\/06\/7.7.jpg-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=\"123\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.7.jpg-300x123.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 655px)\"\r\n                                width=\"655\"\r\n                                height=\"269\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.7.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 655px)\"\r\n                                width=\"655\"\r\n                                height=\"269\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/06\/7.7.jpg.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\/7.7.jpg.webp\"\r\n                                                        title=\"7.7.jpg\"\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>Le p\u00f4le \u00ab\u00a0commun\u00a0\u00bb du transformateur de commande d&rsquo;une machine doit \u00eatre reli\u00e9 \u00e0 la barre de mise \u00e0 la terre du tableau de commande afin d&rsquo;\u00e9viter tout dysfonctionnement des circuits de commande en cas de panne, comme l&rsquo;indique le dessin. Dans l&rsquo;exemple, l&rsquo;un des deux p\u00f4les du transformateur et toutes les parties m\u00e9talliques qui contiennent des circuits de commande, m\u00eame dans le cas de sources de tr\u00e8s basse tension, sont reli\u00e9s. De cette mani\u00e8re, lorsque le premier d\u00e9faut \u00e0 la terre se produit dans le champ, comme indiqu\u00e9 sur la figure, la protection contre les surintensit\u00e9s \u00ab\u00a0I &gt;\u00a0\u00bb s&rsquo;ouvre, le contacteur \u00ab\u00a0K\u00a0\u00bb est mis hors tension, le moteur correspondant est arr\u00eat\u00e9 et la machine passe en \u00e9tat de s\u00e9curit\u00e9.<\/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                    Conclusion    <\/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>Pour d\u00e9cider si une pi\u00e8ce m\u00e9tallique doit \u00eatre raccord\u00e9 ou mise \u00e0 la terre (Grounded dans la langue des \u00c9tats-Unis et du Canada), vous devez tenir compte de ces sept raisons. Si aucune de ces raisons ne s&rsquo;applique, il ne faut pas la raccorder ! La r\u00e8gle selon laquelle \u00ab\u00a0toutes les pi\u00e8ces m\u00e9talliques susceptibles d&rsquo;\u00eatre mises sous tension doivent \u00eatre reli\u00e9es\u00a0\u00bb est trompeuse, tout comme la r\u00e8gle plus g\u00e9n\u00e9rale \u00ab\u00a0s&rsquo;il s&rsquo;agit d&rsquo;une pi\u00e8ce m\u00e9tallique et qu&rsquo;elle ne bouge pas, mettez-la \u00e0 la terre\u00a0\u00bb :<strong> Respectez les sept r\u00e8gles et votre installation sera s\u00fbre !<\/strong><\/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>Pourquoi une pi\u00e8ce m\u00e9tallique doit-elle \u00eatre connect\u00e9e \u00e0 un c\u00e2ble PE (Protection Earth) ?<\/p>\n","protected":false},"author":182,"featured_media":35967,"parent":0,"menu_order":54,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[158],"class_list":["post-35966","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-securite-electrique"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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