{"id":39544,"date":"2023-01-05T14:16:38","date_gmt":"2023-01-05T13:16:38","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/ul-508a\/current-limiting-devices\/"},"modified":"2025-08-18T15:45:55","modified_gmt":"2025-08-18T14:45:55","slug":"current-limiting-devices","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-americaine\/ul-508a\/current-limiting-devices\/","title":{"rendered":"UL 508A &#8211; Dispositifs de limitation de courant"},"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                    <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\/2\"\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\/Table-SB4_1-1-150x150.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 282px)\"\r\n                                width=\"282\"\r\n                                height=\"300\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-SB4_1-1-282x300.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=\"816\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-SB4_1-1-768x816.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 963px)\"\r\n                                width=\"963\"\r\n                                height=\"1024\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Table-SB4_1-1-963x1024.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\/01\/Table-SB4_1-1.png.webp\"\r\n                                                        title=\"Table-SB4_1-1\"\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        \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:flex-row\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9  md:pl-12 xl:pl-24\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Les dispositifs pour lesquels un effet de limitation du courant de court-circuit est attendu, <strong>s&rsquo;ils se trouvent dans la ligne d&rsquo;alimentation<\/strong>, sont les suivants :<\/p>\n<ul>\n<li><strong>Transformateurs de puissance<\/strong> avec secondaire isol\u00e9 (leur courant de court-circuit est limit\u00e9 par l&rsquo;imp\u00e9dance longitudinale repr\u00e9sentant les pertes de cuivre dans les enroulements) ; la m\u00e9thode \u00e0 suivre est fournie par la section SB4.3.1) ;<\/li>\n<li><strong>Disjoncteurs<\/strong> r\u00e9pertori\u00e9s marqu\u00e9s comme \u00ab\u00a0<strong>limitant le courant<\/strong>\u00a0\u00bb ;<\/li>\n<li>les<strong> fusibles<\/strong> de classe CC, G, J, L, RK1, RK5 ou T.<\/li>\n<\/ul>\n<p>Par exemple, si un fusible est utilis\u00e9 dans la ligne d&rsquo;alimentation comme protection principale, la norme UL 508A stipule que son RCCS est \u00e9gal \u00e0 :<\/p>\n<p><strong>(SB4.3.3)<\/strong><\/p>\n<p><strong>a) Le pouvoir de coupure (ou le pouvoir d&rsquo;interruption) du fusible lorsque le SCCR<\/strong> des composants individuels de la d\u00e9rivation est sup\u00e9rieur au \u00ab\u00a0courant de passage\u00a0\u00bb du fusible (c&rsquo;est-\u00e0-dire que les composants en aval du fusible doivent \u00eatre capables de supporter le courant que le fusible laisse passer avant de se rompre). En outre, le pouvoir de coupure des BCPD en aval du fusible ou le SCCR de la combinaison contr\u00f4leur de moteur + BCPD doit \u00eatre sup\u00e9rieur au pouvoir de coupure du fusible. En d&rsquo;autres termes, bien que le SCCR du contr\u00f4leur de moteur puisse \u00eatre augment\u00e9 gr\u00e2ce \u00e0 la coordination avec la protection magn\u00e9tique du BCPD, <strong>le SCCR du BCPD ne peut pas \u00eatre augment\u00e9 en raison de la pr\u00e9sence du fusible dans l&rsquo;alimentation<\/strong>. Si le pouvoir de coupure du BCPD est sup\u00e9rieur \u00e0 celui du fusible, c&rsquo;est le RCCS du fusible qui est pris en compte (<strong>c&rsquo;est le seul cas<\/strong>).<\/p>\n<p>b<strong>) Le plus petit SCCR de tous les BCPD en aval du fusible<\/strong> si la condition a) est remplie mais que le pouvoir de coupure de l&rsquo;un des BCPD (ou le RCCS de la combinaison contr\u00f4leur de moteur + BCPD) est inf\u00e9rieur au pouvoir de coupure du fusible.<\/p>\n<p>(c)<strong> Le plus petit SCCR parmi tous les dispositifs dans les branches en aval du fusible<\/strong> si aucune des conditions ci-dessus n&rsquo;est remplie.<\/p>\n<p>En conclusion, selon la norme UL 508A, l&rsquo;utilisation d&rsquo;un dispositif de limitation dans la d\u00e9rivation (qu&rsquo;il s&rsquo;agisse d&rsquo;un fusible ou d&rsquo;un disjoncteur limiteur de courant) <strong>n&rsquo;augmente pas le SCCR du bornier qui, en tant que composant \u00ab\u00a0le plus faible\u00a0\u00bb du panneau de contr\u00f4le<\/strong>, abaisse le SCCR de l&rsquo;ensemble du circuit de d\u00e9rivation. La seule fa\u00e7on d&rsquo;augmenter le RCCS du circuit de d\u00e9rivation, en \u00e9vitant toute contrainte due au bornier, est de choisir correctement un <strong>dispositif de limitation de courant dans le circuit d&rsquo;alimentation<\/strong> (en respectant les conditions \u00e9num\u00e9r\u00e9es ci-dessus).<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n        \n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>Les dispositifs pour lesquels un effet de limitation du courant de court-circuit est attendu, s&rsquo;ils se trouvent dans la ligne d&rsquo;alimentation, sont les suivants :<\/p>\n<p>Transformateurs de puissance avec secondaire isol\u00e9 (leur courant de court-circuit est limit\u00e9 par l&rsquo;imp\u00e9dance longitudinale repr\u00e9sentant les pertes de cuivre dans les enroulements) ; la m\u00e9thode \u00e0 suivre est fournie par la section SB4.3.1) ;<br \/>\nDisjoncteurs r\u00e9pertori\u00e9s marqu\u00e9s comme \u00ab\u00a0limitant le courant\u00a0\u00bb ;<br \/>\nles fusibles de classe CC, G, J, L, RK1, RK5 ou T.<\/p>\n","protected":false},"author":1,"featured_media":4169,"parent":39459,"menu_order":11,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[167],"class_list":["post-39544","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-americaine"],"acf":{"sottotitolo":"Dispositifs de limitation du courant de court-circuit dans le circuit d'alimentation","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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