{"id":39494,"date":"2023-01-05T14:16:08","date_gmt":"2023-01-05T13:16:08","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=39494"},"modified":"2025-08-18T15:25:09","modified_gmt":"2025-08-18T14:25:09","slug":"ul-508a-dimensionnement-des-circuits-dalimentation","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-americaine\/ul-508a\/ul-508a-dimensionnement-des-circuits-dalimentation\/","title":{"rendered":"UL 508A &#8211; Dimensionnement des circuits d&rsquo;alimentation"},"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                    L&rsquo;approche avant la mise \u00e0 jour de la norme UL 508A en 2020    <\/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\/UL-508A-Sizing-of-Feeder-Circuits-150x150.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 225px)\"\r\n                                width=\"225\"\r\n                                height=\"300\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Sizing-of-Feeder-Circuits-225x300.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"1024\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Sizing-of-Feeder-Circuits-768x1024.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"1024\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/UL-508A-Sizing-of-Feeder-Circuits-768x1024.jpg\"\r\n                                type=\"image\/jpeg\"\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\/UL-508A-Sizing-of-Feeder-Circuits-scaled.jpg\"\r\n                                                        title=\"UL 508A &#8211; Sizing of Feeder Circuits\"\r\n                                                        type=\"image\/jpeg\"\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 existait plusieurs m\u00e9thodes pour dimensionner les circuits d&rsquo;alimentation jusqu&rsquo;en avril 2020.<\/p>\n<p>L&rsquo;\u00e9dition 2018 de la NFPA propose<\/p>\n<ul>\n<li>une approche g\u00e9n\u00e9rale (\u00a7430.62) ;<\/li>\n<li>une approche pour les panneaux de contr\u00f4le industriels \u00ab\u00a0standard\u00a0\u00bb (\u00a7409.62) ;<\/li>\n<li>une approche pour les panneaux de contr\u00f4le industriels sp\u00e9cifiques aux machines industrielles (\u00a7670.4).<\/li>\n<\/ul>\n<p>L&rsquo;\u00e9dition 2018 de la norme UL 508A fournit<\/p>\n<ul>\n<li>une approche pour les panneaux de contr\u00f4le industriels \u00ab\u00a0standard\u00a0\u00bb (\u00a732.3.1) ;<\/li>\n<li>une approche pour les panneaux de contr\u00f4le industriels sp\u00e9cifiques aux machines industrielles (\u00a766.7.4).<\/li>\n<\/ul>\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                    Lignes directrices pour le dimensionnement des circuits d&rsquo;alimentation selon la norme UL 508A mise \u00e0 jour 2020    <\/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>\u00c0 l&rsquo;heure o\u00f9 nous \u00e9crivons ces lignes, la norme NFPA 2021 n&rsquo;a pas encore \u00e9t\u00e9 publi\u00e9e, tandis que la mise \u00e0 jour d&rsquo;avril 2020 de la norme UL 508A a conduit \u00e0 l&rsquo;unification des deux approches susmentionn\u00e9es en une seule qui repr\u00e9sente la m\u00e9thode unique pour tous les types de panneaux de contr\u00f4le industriels.<\/p>\n<p>Les exigences les plus importantes d\u00e9coulant de cette unification sont les suivantes :<\/p>\n<ul>\n<li>Dimensionnement du conducteur d&rsquo;alimentation (\u00a766.5) : il est indiqu\u00e9 que l&rsquo;intensit\u00e9 minimale du conducteur d&rsquo;alimentation doit \u00eatre conforme \u00e0 la condition suivante :<br \/>\nIZ \u2265 1,25% FLCLARGESTOMOTIVE + 1,25% FLCHEATING LOADS + \u2211 FLCOTHER UTILITIES<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li>Dimensionnement de la protection du d\u00e9part (\u00a732.3.1) : il est indiqu\u00e9 que la protection du conducteur de d\u00e9part doit respecter la condition suivante :<br \/>\nIN \u2264 Plus grand BCPD (tableau 31.1) + 1,25\u2219\u2211 FLCALL RESIST. CHARGES + \u2211 CHARGES FLCOTHER ou IN\u2264IZ<\/li>\n<\/ul>\n<p>Voici le texte de la section 32.3.1 :<\/p>\n<blockquote><p>32.3.1 Le calibre de la protection contre les surintensit\u00e9s ne doit pas d\u00e9passer la valeur en amp\u00e8res d\u00e9termin\u00e9e \u00e0 partir des points a) et b), la plus grande valeur \u00e9tant retenue :<\/p>\n<p>a) le calibre du plus grand dispositif de protection du circuit de d\u00e9rivation dans le circuit plus 125 pour cent de toutes les charges de l&rsquo;appareil de chauffage plus les courants de pleine charge de tous les autres moteurs ou autres charges du groupe qui pourraient \u00eatre en service en m\u00eame temps ; ou<br \/>\nb) le courant admissible des conducteurs ou des barres omnibus du c\u00f4t\u00e9 de la charge du dispositif de protection contre les surintensit\u00e9s.<\/p><\/blockquote>\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>Il existait plusieurs m\u00e9thodes pour dimensionner les circuits d&rsquo;alimentation jusqu&rsquo;en avril 2020.<br \/>\n\u00c0 l&rsquo;heure o\u00f9 nous \u00e9crivons ces lignes, la norme NFPA 2021 n&rsquo;a pas encore \u00e9t\u00e9 publi\u00e9e, tandis que la mise \u00e0 jour d&rsquo;avril 2020 de la norme UL 508A a conduit \u00e0 l&rsquo;unification des deux approches susmentionn\u00e9es en une seule qui repr\u00e9sente la m\u00e9thode unique pour tous les types de panneaux de contr\u00f4le industriels.<\/p>\n","protected":false},"author":182,"featured_media":39490,"parent":39459,"menu_order":5,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[167],"class_list":["post-39494","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-americaine"],"acf":{"sottotitolo":"Exigences g\u00e9n\u00e9rales pour le dimensionnement des circuits d'alimentation conform\u00e9ment \u00e0 la norme UL 508A","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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