{"id":2728,"date":"2016-08-09T16:02:20","date_gmt":"2016-08-09T23:02:20","guid":{"rendered":"https:\/\/brainfiller.com\/?p=2728"},"modified":"2025-11-21T14:24:52","modified_gmt":"2025-11-21T21:24:52","slug":"the-national-electrical-code-article-240-86-addresses-series-ratings-with-the-following","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/arc-flash-forum-update\/the-national-electrical-code-article-240-86-addresses-series-ratings-with-the-following\/","title":{"rendered":"Clasificaciones de la serie NEC 240.86"},"content":{"rendered":"

El art\u00edculo 240.86 del C\u00f3digo El\u00e9ctrico Nacional aborda las clasificaciones en serie de la siguiente manera:<\/p>\n

Cuando se utiliza un disyuntor en un circuito que tiene una corriente de falla disponible mayor que el valor nominal de interrupci\u00f3n marcado al estar conectado en el lado de carga de un dispositivo de protecci\u00f3n contra sobrecorriente aceptable que tiene un valor nominal mayor, el disyuntor deber\u00e1 cumplir con los requisitos especificados en (A) o (B), y (C).<\/p>\n

(A) Seleccionados bajo supervisi\u00f3n de ingenier\u00eda en instalaciones existentes. Los dispositivos combinados clasificados en serie deber\u00e1n ser seleccionados por un ingeniero profesional autorizado que se dedique principalmente al dise\u00f1o o mantenimiento de instalaciones el\u00e9ctricas. La selecci\u00f3n deber\u00e1 ser documentada y sellada por el ingeniero profesional. Esta documentaci\u00f3n deber\u00e1 estar disponible para aquellos autorizados a dise\u00f1ar, instalar, inspeccionar, mantener y operar el sistema. Esta clasificaci\u00f3n de combinaci\u00f3n en serie, incluida la identificaci\u00f3n del dispositivo aguas arriba, deber\u00e1 marcarse en el campo en el equipo de uso final. Para aplicaciones calculadas, el ingeniero deber\u00e1 asegurarse de que el o los disyuntores aguas abajo que forman parte de la combinaci\u00f3n en serie permanezcan pasivos durante el per\u00edodo de interrupci\u00f3n del dispositivo limitador de corriente de clasificaci\u00f3n completa del lado de la l\u00ednea.<\/p>\n

A principios de la d\u00e9cada de 1980, hubo algunos problemas con las clasificaciones de serie y se introdujeron las combinaciones probadas. Se desarrollaron est\u00e1ndares de prueba de clasificaci\u00f3n de serie de acuerdo con UL y los fabricantes de interruptores autom\u00e1ticos comenzaron a proporcionar tablas con sus clasificaciones de serie enumeradas como las que vemos hoy. 240.87(B) establece<\/p>\n

(B) Combinaciones probadas. La combinaci\u00f3n de dispositivo de protecci\u00f3n contra sobrecorriente del lado de la l\u00ednea y disyuntor(es) del lado de la carga se prueba y se marca en el equipo de uso final, como tableros de distribuci\u00f3n y paneles de distribuci\u00f3n.
\nNota informativa para (A) y (B): V\u00e9ase 110.22 para el marcado de sistemas de combinaci\u00f3n en serie.<\/p>\n

240.87 (C) aborda la situaci\u00f3n en la que puede producirse una contribuci\u00f3n de cortocircuito del motor, tambi\u00e9n conocida como \u201ccontribuci\u00f3n del motor\u201d, entre los dispositivos del lado de la l\u00ednea y del lado de la carga que forman una clasificaci\u00f3n en serie. La consideraci\u00f3n es la siguiente:<\/p>\n

(C) Contribuci\u00f3n del motor. No se utilizar\u00e1n clasificaciones en serie cuando (1) los motores est\u00e9n conectados en el lado de carga del dispositivo de sobrecorriente de mayor clasificaci\u00f3n y en el lado de l\u00ednea del dispositivo de sobrecorriente de menor clasificaci\u00f3n, y
\n(2) La suma de las corrientes de carga completa del motor excede el 1 por ciento de la capacidad de interrupci\u00f3n del disyuntor de menor capacidad.<\/p>\n

Un ejemplo de clasificaci\u00f3n en serie puede ser un disyuntor que normalmente tiene una clasificaci\u00f3n de interrupci\u00f3n de 22 000 amperios, pero cuando est\u00e1 protegido con fusibles de corriente ascendente de un tama\u00f1o y una clase espec\u00edficos, puede tener una clasificaci\u00f3n en serie de 100 000 amperios. Esta debe ser una combinaci\u00f3n listada o determinada bajo supervisi\u00f3n de ingenier\u00eda como se indica anteriormente en 240.86 (A)<\/p>\n

Quienes consideren utilizar clasificaciones en serie deben revisar exhaustivamente los requisitos de 240.87.<\/p>\n

Con toda esa informaci\u00f3n, aqu\u00ed est\u00e1 la pregunta de esta semana.<\/p>\n

\u00bfSu instalaci\u00f3n o la instalaci\u00f3n de su cliente utilizan clasificaciones en serie?
\n- S\u00ed
\n- No
\n\u2013 M\u00faltiples sitios \u2013 algunos lo hacen
\n\u2013 No lo s\u00e9
\n\u2013 No se aplica a m\u00ed<\/p>\n

HACER CLIC<\/a> Para responder y revisar la discusi\u00f3n.<\/p>\n

\n

\"NFPA70E<\/a>Acerca de Jim Phillips, PE:<\/strong><\/em>\u00a0<\/em>Programas de capacitaci\u00f3n sobre energ\u00eda el\u00e9ctrica y arco el\u00e9ctrico: durante m\u00e1s de 30 a\u00f1os, Jim Phillips ha ayudado a decenas de miles de personas en todo el mundo a comprender el dise\u00f1o, el an\u00e1lisis, el arco el\u00e9ctrico y la seguridad el\u00e9ctrica de los sistemas de energ\u00eda el\u00e9ctrica.<\/em> Jim es vicepresidente de IEEE 1584 y presidente internacional de IEC TC78 Live Working. Se ha ganado la reputaci\u00f3n de ser uno de los mejores capacitadores en la industria de la energ\u00eda el\u00e9ctrica.<\/em>,<\/em><\/strong>\u00a0<\/em><\/strong>M\u00e1s informaci\u00f3n<\/strong><\/em><\/a>.<\/em><\/p>\n

haga clic aqu\u00ed<\/strong><\/a>\u00a0Para el futuro\u00a0Capacitaci\u00f3n sobre seguridad frente a arcos el\u00e9ctricos<\/strong><\/p>\n

haga clic aqu\u00ed<\/strong><\/a> Para todos los programados<\/strong> Capacitaci\u00f3n en seguridad el\u00e9ctrica<\/strong><\/p>\n

haga clic aqu\u00ed<\/strong><\/a> Para solicitar una <\/strong>Capacitaci\u00f3n en el sitio<\/strong><\/p>\n

Inscribirse<\/strong>\u00a0<\/em><\/a>para mi publicaci\u00f3n mensual \u201cGrey Matter\u201d que contiene noticias sobre nuevos est\u00e1ndares, conferencias, art\u00edculos t\u00e9cnicos, noticias de ingenier\u00eda el\u00e9ctrica y mucho m\u00e1s.<\/em><\/p>","protected":false},"excerpt":{"rendered":"

The National Electrical Code article 240.86 addresses series ratings with the following: Where a circuit breaker is used on a circuit having an available fault current higher than the marked 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