{"id":4266,"date":"2024-02-27T14:10:18","date_gmt":"2024-02-27T20:10:18","guid":{"rendered":"https:\/\/www.dreiym.com\/?p=4266"},"modified":"2025-01-17T18:02:42","modified_gmt":"2025-01-18T00:02:42","slug":"nec-2023-240-87-reduction-de-lenergie-de-larc","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2024\/02\/27\/nec-2023-240-87-reduction-de-lenergie-de-larc\/","title":{"rendered":"NEC 240.87 : R\u00e9duction de l'\u00e9nergie de l'arc"},"content":{"rendered":"<p>Un guide pour les professionnels de l'\u00e9lectricit\u00e9 pour l'\u00e9dition 2023 du NEC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu'est-ce que la norme NEC 240.87 ?<\/h2>\n\n\n\n<p>La norme NEC 240.87 est une section du code de la <a href=\"https:\/\/en.wikipedia.org\/wiki\/National_Electrical_Code\" title=\"\">Code national de l'\u00e9lectricit\u00e9 (NEC)<\/a>) qui exige des m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc pour les disjoncteurs de 1200 amp\u00e8res ou plus. L'\u00e9nergie de l'arc est la quantit\u00e9 de chaleur et de lumi\u00e8re produite par un arc \u00e9lectrique. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2024\/06\/11\/le-lien-entre-les-eclairs-darc-et-les-analyses-et-inspections-approfondies-des-defaillances-electriques\/'>arc \u00e9lectrique<\/a> Les m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc sont con\u00e7ues pour r\u00e9duire la dur\u00e9e et l'intensit\u00e9 d'un d\u00e9faut d'arc, ce qui minimise les risques potentiels. Les m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc sont con\u00e7ues pour r\u00e9duire la dur\u00e9e et l'intensit\u00e9 d'un d\u00e9faut d'arc, minimisant ainsi les dangers potentiels.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi la norme NEC 240.87 est-elle importante ?<\/h2>\n\n\n\n<p>La norme NEC 240.87 est importante parce qu'elle traite d'un grave probl\u00e8me de s\u00e9curit\u00e9 dans les domaines suivants <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2022\/07\/29\/3-raisons-courantes-pour-lesquelles-les-systemes-electriques-tombent-en-panne\/'>les syst\u00e8mes \u00e9lectriques<\/a>. Les d\u00e9fauts d'arc peuvent se produire pour diverses raisons, telles qu'une d\u00e9faillance de l'isolation, <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2024\/02\/28\/comment-eviter-les-connexions-electriques-laches-et-prevenir-les-risques-dincendie\/'>des connexions desserr\u00e9es,<\/a> des objets \u00e9trangers ou une erreur humaine. Lorsqu'un arc \u00e9lectrique se produit, il peut g\u00e9n\u00e9rer des temp\u00e9ratures allant jusqu'\u00e0 35 000 degr\u00e9s Fahrenheit, ce qui peut faire fondre le m\u00e9tal, enflammer les mat\u00e9riaux combustibles et provoquer des br\u00fblures et des blessures graves. Les d\u00e9fauts d'arc peuvent \u00e9galement cr\u00e9er des ondes de pression susceptibles de rompre les tympans, d'endommager les poumons et de briser les vitres. Selon la National Fire Protection Association (NFPA), les arcs \u00e9lectriques sont responsables de plus de 2 000 blessures et 400 d\u00e9c\u00e8s par an aux \u00c9tats-Unis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quelles sont les m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc exig\u00e9es par la norme NEC 240.87 ?<\/h2>\n\n\n\n<p>La norme NEC 240.87 exige l'une des m\u00e9thodes suivantes de r\u00e9duction de l'\u00e9nergie de l'arc pour les disjoncteurs de 1200 amp\u00e8res ou plus :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verrouillage s\u00e9lectif de zone (ZSI) : Cette m\u00e9thode utilise des signaux de communication entre les disjoncteurs pour coordonner leurs temps de d\u00e9clenchement et isoler la zone en d\u00e9faut le plus rapidement possible. Le ZSI peut r\u00e9duire l'\u00e9nergie de l'arc jusqu'\u00e0 50% par rapport \u00e0 la coordination conventionnelle. La ZSI n\u00e9cessite des disjoncteurs compatibles et un c\u00e2blage entre eux.<\/li>\n\n\n\n<li>Relais diff\u00e9rentiel : Cette m\u00e9thode utilise des transformateurs de courant pour mesurer la diff\u00e9rence entre les courants entrant et sortant d'un disjoncteur et d\u00e9clencher le disjoncteur si la diff\u00e9rence d\u00e9passe une valeur d\u00e9finie. Le relais diff\u00e9rentiel peut r\u00e9duire l'\u00e9nergie de l'arc jusqu'\u00e0 80% par rapport \u00e0 la coordination conventionnelle. Le relais diff\u00e9rentiel n\u00e9cessite des transformateurs de courant et des relais suppl\u00e9mentaires.<\/li>\n\n\n\n<li>Commutation de maintenance \u00e0 r\u00e9duction d'\u00e9nergie avec indicateur d'\u00e9tat local : Cette m\u00e9thode utilise un interrupteur qui peut \u00eatre actionn\u00e9 manuellement pour r\u00e9duire le seuil de d\u00e9clenchement du disjoncteur et un voyant qui indique l'\u00e9tat de l'interrupteur. La commutation de maintenance \u00e0 r\u00e9duction d'\u00e9nergie peut r\u00e9duire l'\u00e9nergie d'arc jusqu'\u00e0 70% par rapport \u00e0 la coordination conventionnelle. La commutation de maintenance \u00e0 r\u00e9duction d'\u00e9nergie n\u00e9cessite un interrupteur et un voyant sur le disjoncteur ou \u00e0 proximit\u00e9 de celui-ci.<\/li>\n\n\n\n<li>Syst\u00e8me actif d'att\u00e9nuation de l'\u00e9clair d'arc \u00e9lectrique \u00e0 r\u00e9duction d'\u00e9nergie : Cette m\u00e9thode utilise un dispositif capable de d\u00e9tecter et d'\u00e9teindre un d\u00e9faut d'arc en cr\u00e9ant un chemin \u00e0 faible imp\u00e9dance pour le courant de d\u00e9faut et en appliquant une contre-tension \u00e0 l'arc. Syst\u00e8me d'att\u00e9nuation active de l'\u00e9clair d'arc \u00e0 r\u00e9duction d'\u00e9nergie <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2020\/09\/08\/les-moyens-de-reduire-les-incidents-lies-a-leclair-darc-electrique\/'>le syst\u00e8me d'att\u00e9nuation de l'\u00e9clair d'arc \u00e9lectrique peut r\u00e9duire<\/a> l'\u00e9nergie de l'arc jusqu'\u00e0 90% par rapport \u00e0 la coordination conventionnelle. Le syst\u00e8me d'att\u00e9nuation active de l'\u00e9clair d'arc \u00e9lectrique \u00e0 r\u00e9duction d'\u00e9nergie n\u00e9cessite un dispositif et une source d'\u00e9nergie.<\/li>\n\n\n\n<li>R\u00e9glage du d\u00e9clenchement instantan\u00e9 : Cette m\u00e9thode utilise un disjoncteur qui peut se d\u00e9clencher dans un cycle ou moins lorsque le courant de d\u00e9faut atteint une valeur pr\u00e9d\u00e9finie. Le d\u00e9clenchement instantan\u00e9 peut r\u00e9duire l'\u00e9nergie de l'arc jusqu'\u00e0 40% par rapport \u00e0 la coordination conventionnelle. Le d\u00e9clenchement instantan\u00e9 n\u00e9cessite un disjoncteur dot\u00e9 d'une fonction de d\u00e9clenchement instantan\u00e9 r\u00e9glable.<\/li>\n\n\n\n<li>D\u00e9rogation instantan\u00e9e : Cette m\u00e9thode utilise un disjoncteur qui peut ignorer la temporisation normale et se d\u00e9clencher imm\u00e9diatement lorsque le courant de d\u00e9faut d\u00e9passe un certain niveau. La neutralisation instantan\u00e9e peut r\u00e9duire l'\u00e9nergie de l'arc jusqu'\u00e0 60% par rapport \u00e0 la coordination conventionnelle. Une commande prioritaire instantan\u00e9e n\u00e9cessite un disjoncteur dot\u00e9 d'une fonction de commande prioritaire instantan\u00e9e.<\/li>\n\n\n\n<li>Moyens \u00e9quivalents approuv\u00e9s : Cette m\u00e9thode utilise toute autre technologie capable de r\u00e9duire l'\u00e9nergie de l'arc \u00e0 un niveau inf\u00e9rieur \u00e0 l'\u00e9nergie incidente \u00e0 la distance de travail. Les moyens \u00e9quivalents approuv\u00e9s peuvent varier en termes de performances et d'exigences d'installation. Les moyens \u00e9quivalents approuv\u00e9s doivent \u00eatre approuv\u00e9s par l'autorit\u00e9 comp\u00e9tente. Parfois, il faut faire preuve de cr\u00e9ativit\u00e9 et l'application de fonctions de relais sp\u00e9ciales ou d'autres solutions techniques peut permettre d'obtenir des r\u00e9sultats identiques ou meilleurs en mati\u00e8re de r\u00e9duction des d\u00e9fauts d'arc. Pour ce faire, des calculs techniques sont n\u00e9cessaires. Consulter un <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/services\/lenergie-electrique\/etudes-sur-leclair-darc-electrique\/\" title=\"\">ing\u00e9nieur \u00e9lectricien<\/a> pour vous aider \u00e0 trouver d'autres solutions.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Comment se conformer \u00e0 la norme NEC 240.87 ?<\/h2>\n\n\n\n<p>Pour se conformer \u00e0 la norme NEC 240.87, les professionnels de l'\u00e9lectricit\u00e9 doivent suivre les \u00e9tapes suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identifier les disjoncteurs de 1200 amp\u00e8res ou plus dans le syst\u00e8me \u00e9lectrique.<\/li>\n\n\n\n<li>S\u00e9lectionnez et installez l'une des m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc pour chaque disjoncteur.<\/li>\n\n\n\n<li>\u00c9tiqueter le disjoncteur avec la m\u00e9thode de r\u00e9duction de l'\u00e9nergie de l'arc et l'emplacement de la documentation.<\/li>\n\n\n\n<li>Documenter la m\u00e9thode de r\u00e9duction de l'\u00e9nergie de l'arc et les r\u00e9glages du disjoncteur.<\/li>\n\n\n\n<li>Tester et v\u00e9rifier la fonctionnalit\u00e9 de la m\u00e9thode de r\u00e9duction de l'\u00e9nergie de l'arc.<\/li>\n\n\n\n<li>Mettre \u00e0 jour l'analyse des risques d'\u00e9clair d'arc et les \u00e9tiquettes d'\u00e9clair d'arc du syst\u00e8me \u00e9lectrique.<\/li>\n<\/ul>\n\n\n\n<p>La norme NEC 240.87 est une section du code qui exige des m\u00e9thodes de r\u00e9duction de l'\u00e9nergie de l'arc pour les disjoncteurs d'une capacit\u00e9 de 1200 amp\u00e8res ou plus. Elle vise \u00e0 am\u00e9liorer la s\u00e9curit\u00e9 des <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/fr_fr\/2024\/06\/11\/le-lien-entre-les-eclairs-darc-et-les-analyses-et-inspections-approfondies-des-defaillances-electriques\/'>syst\u00e8mes \u00e9lectriques et de r\u00e9duire les risques d'arc<\/a> d\u00e9fauts. Les professionnels de l'\u00e9lectricit\u00e9 doivent conna\u00eetre les m\u00e9thodes de r\u00e9duction de l'\u00e9nergie d'arc et les \u00e9tapes \u00e0 suivre pour se conformer \u00e0 la norme NEC 240.87.<\/p>","protected":false},"excerpt":{"rendered":"<p>A Guide for Electrical Professionals for the 2023 NEC edition. What is NEC 240.87? NEC 240.87 is a code section in the National Electrical Code (NEC) that requires arc energy reduction methods for circuit breakers rated at 1200 amps or higher. Arc energy is the amount of heat and light produced by an electrical arc [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":4267,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":218,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-4266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"A Guide for Electrical Professionals for the 2023 NEC edition. What is NEC 240.87? 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