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NFPA 70E Norma para la Seguridad Eléctrica en Lugares de Trabajo Edición 201 2015
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
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Título del Documento Original: NFPA 70E
Standard for Electrical for Electrical Safety in the Workplace Workplace 2015 Edition
Título en Español: NFPA 70E
Norma para la Seguridad Eléctrica en Lugares de Trabajo Edición 2015
Traducción:
Sebastián M. Llaneza (Traducción técnica)
Revisión Técnica:
Alejandro María Llaneza Coda International Electrical Safety & Reliability Consultants
NFPA no se hace responsable por la exactitud y veracida d de esta traducción al español. En el caso de a lgún conflicto entre las ediciones en idioma inglés y español, el i dioma inglés prevalecerá.
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
70E-1
Derechos de autor © 2014 National Fire Protection Association®. Todos los derechos reservados.
NFP NF PA®70 70E E Norma para la
Seguridad Eléctrica en Lugares de Trabajo Edición 2015
La presente edición de NFPA 70E, Norma para la seguridad eléctrica en lugares de trabajo , fue preparada por el Comité Técnico de Seguridad Eléctrica en Lugares de Trabajo, Trabajo, y publicada por el Comité de Correlación del Código Eléctrico Nacional. Fue emitida por el Consejo de Normas el 14 de julio de 2014, con fecha de entrada en vigor el 29 de julio de 2014 y reemplaza a todas las ediciones anteriores. Una Enmienda interina tentativa (TIA) para 130.7(C)(10)(b)(1) y Tablas H.3(a) y (b) fue emitida el 14 de agosto de 2014. Para más información sobre las enmiendas interinas tentativas, consulte la Sección 5 de las Reglamentaciones que rigen el desarrollo de Normas NFPA, disponible en http://www http://www.nfpa.org/regs .nfpa.org/regs Esta edición de la NFPA 70E se aprobó como Norma Nacional de los Estados Unidos el 29 de julio de 2014. Prefacio a la NFPA 70E
El Consejo de Normas de la National Fire Protection Association anunció el 7 de enero de 1976, el establecimiento de manera o�cial de un nuevo comité eléctrico para el desarrollo de normas. Con el nombre de Comité sobre los Requisitos de Seguridad Eléctrica para los Lugares de Trabajo de los Empleados, NFPA NFPA 70E, este nuevo comité reporta a la NFPA por medio del Comité de Correlación Técnica del Código Eléctrico Nacional (NEC ®). Este comité se formó para colaborar con OSHA en la preparación de normas de seguridad eléctrica que asistan a las necesidades de OSHA y se puedan promulgar rápidamente utilizando lo previsto en la Sección 6(b) de la ley de Seguridad y Salud Ocupacional. OSHA encontró que al tratar de utilizar la última edición de NFPA 70®, Código Eléctrico Nacional (NEC ®), se enfrentó con los siguientes problemas: (1) La actualización con respecto a una nueva edición del NEC tendría tendría que hacerse mediante los procedimientos OSHA 6(b). OSHA adoptó el NEC 1968 1968 y después el 1971 de acuerdo con los procedimientos de la Sección 6(a) de la Ley de Seguridad y Salud Ocupacional de 1970. Sin embargo, hoy, OSHA sólo puede adoptar o modi�car una norma mediante los procedimientos de la Sección 6(b) de la Ley de OSHA, la cual requiere que se haga un anuncio público, que haya un tiempo para comentarios del público y se realicen audiencias públicas. La adopción de una nueva edición del NEC mediante mediante estos procedimientos requeriría un gran esfuerzo y la apropiación de recursos por parte de OSHA y de otros. Aun así, la aplicación de los procedimientos de la Sección 6(b) podría resultar en requisitos sustancialmente diferentes de los del NEC , creando, por lo tanto, el problema del con�icto entre la norma OSHA y otras normas nacionales y locales. (2) El NEC se se destina principalmente a su uso por parte de quienes diseñan, instalan, e inspeccionan instalaciones eléctricas. Los reglamentos eléctricos de OSHA abarcan a empleadores y empleados en sus lugares de trabajo. El contenido técnico y la complejidad del NEC son son extremadamente difíciles de entender para un empleador o empleado medio. (3) Algunas de las disposiciones detalladas en el NEC no no están directamente relacionadas con la seguridad del empleado y por lo tanto son de poco valor para las necesidades de OSHA. (4) La exigencia de prácticas de trabajo y mantenimiento del sistema eléctrico relacionadas con la seguridad, consideradas críticas para la seguridad en general, no están en el NEC , el
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
70E-2
SEGURIDAD ELÉCTRICA EN LUGARES DE TRABAJO
Esto llevó al concepto de elaborar un documento mediante un grupo competente que representando todos los intereses, extrajera partes adecuadas del NEC y y de otros documentos aplicables a la seguridad eléctrica. Este concepto fue presentado, junto con un ofrecimiento de colaboración en mayo de de 1975 al Secretario Asistente de Trabajo Trabajo de OSHA, quien respondió lo siguiente, “El concepto, los procedimientos y el alcance del esfuerzo tratado con mi personal para preparar la norma en cuestión, parecen tener gran valor y existe una evidente necesidad de contar con el documento de consenso propuesto, el cual OSHA puede considerar para su promulgación bajo las disposiciones de la Sección 6(b) de la Ley. OSHA tiene interés en este esfuerzo y cree que la norma propuesta puede servir para un propósito útil”. Con este estímulo positivo por parte de OSHA, una propuesta para preparar dicho documento fue presentada a la Sección Eléctrica de NFPA, la cual unánimemente apoyó una recomendación para que el Comité de Correlación Técnica Técnica del NEC examinara examinara la factibilidad de desarrollar un documento cuyo objetivo fuera servir de base para la evaluación de la seguridad eléctrica en los lugares de trabajo. En concordancia con la recomendación de la Sección Eléctrica y del Comité de Correlación Técnica, Técnica, el Consejo de Normas autorizó la creación de un comité para llevar a cabo este estudio. El comité consideró viable el desarrollo de una norma que abarcara las instalaciones eléctricas y que fuera compatible con los requisitos de OSHA concernientes a la seguridad de los empleados en los lugares que se incluyen en el NEC . La nueva norma fue visualizada como constituida por cuatro partes principales: Parte I, Requisitos de seguridad de instalaciones; Parte II, Prácticas de trabajo relacionadas con la seguridad; Parte III, Requisitos de mantenimiento relacionados con la seguridad; y Parte IV, Requisitos de seguridad para equipos especiales. Aunque deseable, no se consideró esencial que se completaran todas las partes antes de publicar la norma y que esta se hiciera disponible. Se reconoce que cada parte es un aspecto importante de la seguridad eléctrica en el lugar de trabajo, pero las partes son su�cientemente independientes entre sí para permitir su publicación por separado. A la nueva norma se le dio el título NFPA 70E, Norma sobre los requisitos de seguridad eléctrica en los lugares de trabajo de los empleados. La primera edición fue publicada en 1979 y contenía solamente la Parte I. La segunda edición fue publicada en 1981. Incluyó la Parte I como había sido publicada originalmente y una nueva Parte II. En 1983, la tercera edición incluyó las Partes I y II como fueron publicadas originalmente y una nueva Parte III. En 1988, se publicó la cuarta edición con algunas pequeñas revisiones. La quinta edición, publicada en 1995, incluyó importantes revisiones a la Parte I, actualizándola a �n de adaptarla a la edición 1993 de NFPA 70, Código Eléctrico Nacional ( (NEC ). ). En la Parte II de la quinta edición se introdujeron los conceptos de “límites de aproximación”, y el establecimiento del concepto de “arco”. En el 2000, la sexta edición incluyó una completa actualización de la Parte I para adaptarla al NEC 1999, 1999, así como también una nueva Parte IV. La Parte II continuó centrándose en establecer fronteras de protección contra relámpago de arco y el uso de equipo de protección personal. También, También, se agregaron grá�cas en la Parte II de la versión 2000 para asistir al usuario en la aplicación de la vestimenta protectora y el equipo de protección personal adecuados para los trabajos comunes. La séptima edición, publicada en el año 2004, re�eja varios cambios importantes realizados al documento. Entre ellos, los más destacados hacían énfasis en las prácticas de trabajo seguras. La claridad y la facilidad de uso del documento también fueron realzadas. El nombre del documento se cambió a NFPA 70E, Norma para la seguridad eléctrica en lugares de trabajo . El documento en su totalidad fue reestructurado para cumplir con el Manual de Estilo del Código Eléctrico Nacional , que provee una designación única para cada requisito. Las partes e xistentes se renombraron como capítulos y fueron reorganizadas; se ubicaron las prácticas de trabajo relacionadas con la seguridad al frente del documento para remarcar la importancia que se les otorga; seguidas luego por los requisitos de mantenimiento relacionados con la seguridad; requisitos de seguridad para equipos especiales; y requisitos de seguridad relacionados con las instalaciones. El capítulo sobre prácticas de trabajo relacionadas con la seguridad también fue reorganizado para hacer énfasis en el trabajo sobre partes energizadas como la última alternativa de práctica de trabajo. El permiso para trabajo eléctrico energizado y los requisitos relacionados se incorporaron en el documento. Asimismo, varias de�niciones se modi�caron o adicionaron para incrementar la utilidad del documento y el Capítulo 4 se actualizó para que se corresponda con la edición NEC 2002. 2002. Es esencial, para el uso apropiado del Capítulo 4 de esta norma, que se entienda que el mismo no tiene el propósito de ser aplicado como norma: de diseño, de instalación, de modi�cación o de construcción, para instalaciones o sistemas eléctricos. Su contenido ha sido intencionalmente acotado en comparación con el contenido del NEC , para que se aplique a instalaciones eléctricas o a sistemas eléctricos en tanto lugares de trabajo del e mpleado. Esta norma es compatible con las disposiciones correspondientes del NEC pero pero no tiene el propósito de utilizarse, ni puede utilizarse, en lugar del NEC . Se puede discutir que todos los requerimientos del NEC cuando cuando se da trazabilidad a través de una cadena de eventos, se relacionan con un peligro eléctrico, pero, para �nes prácticos, esas disposiciones que en general no están directamente asociadas con la seguridad del trabajador no se han incluido. Para determinar las disposiciones que se debían incluir en el Capítulo 4, se utilizaron los siguientes lineamientos: (1) Las disposiciones deben proporcionar protección al empleado ante los peligros eléctricos. (2) Sus disposiciones deben ser extraídas del NEC de de tal manera que mantengan su intención como aplique a la seguri-
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PREFACIO
70E-3
(4) El cumplimiento de las disposiciones se debe determinar mediante la inspección realizada durante el estado normal de las instalaciones del empleado, sin remover partes que requieran la desenergización de la instalación eléctrica o daño de la estructura o el acabado del edi�cio. (5) Las disposiciones no se deben di�cultar con detalles innecesarios. (6) Las disposiciones deben ser escritas para mejorar su entendimiento por parte del empleador y del empleado. (7) Las disposiciones no deben agregar requisitos que no se encuentren en el NEC , ni tampoco se debe cambiar el propósito del NEC si si se cambia la redacción. Por lo tanto el Capítulo 4 de NFPA 70E se creó con la intención de atender una necesidad muy especí�ca de OSHA y de ninguna manera tiene el propósito de utilizarse como sustituto del NEC . La omisión de algunos requisitos que actualmente se encuentran en el NEC , de ninguna manera afecta al NEC , ni se deben considerar estos requisitos omitidos como no importantes. Ellos son esenciales para el NEC y y su aplicación prevista, eso es, su uso por quienes: diseñan, instalan, e inspeccionan, instalaciones eléctricas. Por otro lado, NFPA 70E tiene el propósito de ser utilizada por: empleadores, empleados y OSHA. Para el 2009, más de 1300 propuestas y comentarios fueron repasados por el comité, aumentando los requisitos a lo largo del documento. Entre lo más signi�cativo, fue eliminado el Capítulo 4 porque era un duplicado de los requisitos de instalación del Código Eléctrico Nacional. Dado que el NEC y y la NFPA 70E están en diferentes ciclos de revisión, siempre existía el riesgo de que el contenido del Capítulo 4 de la NFPA 70E no estuviera actualizado con respecto al NEC . El Artículo 350 fue agregado para Instalaciones de Investigación y Desarrollo. Otros cambios incluían revisiones signi�cativas a los siguientes: Anexo Informativo D, Anexo Informativo E, Anexo Informativo F, y Anexo Informativo J, y la adición de los nuevos anexos, Anexo Informativo M, Anexo Informativo N, y Anexo Informativo O. La edición 2012 de NFPA 70E marcó otro punto intermedio mientras est a norma continuaba evolucionando y satisfaciendo las necesidades de seguridad eléctrica de empleados y empleadores. Nuevas investigaciones, nueva tecnología y el aporte de información técnica obtenida de los usuarios de la norma constituyeron la base de los requisitos revisados y de nuevos requisitos que permitieron abordar los riesgos eléctricos enfrentados por los empleados en sus lugares de trabajo en la actualidad. Las modi�caciones que ampliaron o aclararon los requisitos de la edición 2009, la inclusión de nuevo material técnico que no había sido contemplado en ediciones anteriores de la norma y la e liminación de los requisitos que estaban relacionados con la instalación segura de equipos eq uipos eléctricos (en particular del Artículo 320), más que prácticas seguras de trabajo eléctrico fueron algunas de las principales acciones implementadas por el Comité Técnico sobre Seguridad Eléctrica en el Lugar de Trabajo Trabajo en el ciclo de revisión del año 2012. Además, a lo largo de toda la norma se modi�caron las disposiciones sobre los conceptos separados aunque directamente relacionados de identi�cación de peligros y evaluación de riesgos a �n de clari�carlos. Una signi�cativa revisión del Anexo Informativo F aportó la amplia cobertura de este tema, con el propósito de asistir a los usuarios de la norma en la implementación de procedimientos efectivos para la identi�cación de peligros y la evaluación de riesgos. En el ciclo de revisión de 2012, la mayoría de los cambios ocurrieron en el Capítulo 1. Con excepción de las signi�cativas modi�caciones del Artículo 320, Requisitos de seguridad relacionados con baterías y salas de baterías, las modi�caciones de los Capítulos 2 y 3 se realizaron principalmente con �nes aclaratorios y editoriales. Además del Anexo Informativo F, los anexos informativos D, H, J y O también fueron sometidos a revisiones sustanciales. Se agregó un nuevo Anexo Informativo P sobre el alineamiento de la implementación de la norma NFP NFPA A 70E con los estándares de gestión de seguridad y salud ocupacional. Entre las modi�caciones más importantes se incluyó el cambio de la expresión “resistente a las llamas (RLL)” por “resistente al arco (RA)” en relación a los equipos de protección personal (EPP), a lo largo de toda la norma. Se agregaron, el Artículo 105, Aplicación de prácticas prácticas de trabajo relacionadas con la seguridad, seguridad, y el requisito de protección auditiva cuando cuando se trabaja dentro de la frontera de relámpago de arco, así como también requisitos de práctica de trabajo para el uso de interruptores de
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70E-4
SEGURIDAD ELÉCTRICA EN LUGARES DE TRABAJO
(2) La de�nición de Trabajo con Manos Desnudas y y todas las referencias al trabajo con manos desnudas fueron eliminadas. Este término, considerado una técnica de trabajo en líneas “de potencia de servicio público” es abordado más apropiadamente en otras normas. (3) Se agregó una de�nición de Permiso de Trabajo Eléctrico Energizado en el Artículo 100, y la de�nición de Persona Cali�cada fue fue revisada para asegurar su correlación con OSHA 1910.399 Nota 2. [100] (4) La Frontera de Aproximación Prohibida fue eliminada. El requerimiento del uso de equipo de protección contra choque por lo general comienza en la frontera de aproximación restringida. No se requería equipo de protección adicional al cruzar la frontera de aproximación prohibida. Cambios anteriores que usaban la frontera de aproximación limitada o frontera de relámpago de arco para “accionar” requerimientos han hecho innecesario el uso de este término. (5) Un programa de seguridad eléctrica ahora debe incluir elementos que consideren la condición del mantenimiento. [110.1(B)] (6) Se deben realizar auditorías de trabajo de campo para veri�car el cumplimiento de los procedimientos establecidos en el programa de seguridad eléctrica en intervalos que no excedan de 1 año. [110.1(I)(2)] (7) La ubicación, tamaño y aplicación del equipo de protección de puesta a tierra temporal debe ser identi�cado como parte del plan de trabajo t rabajo del empleador. [120.3(A)] (8) Se agregaron nuevos requerimientos aclarando dónde se permite la operación normal de equipo eléctrico. Los equipos deben ser instalados y mantenidos apropiadamente, las puertas de los equipos cerradas y aseguradas, todas las cubiertas en su lugar y aseguradas, y no debe haber evidencia de fallas inminentes. [130.2(A)(4)] (9) Se agregó la aclaración de que pueden usarse tanto el método de análisis de energía incidente como el método de categorías de EPP para relámpago de arco en la misma pieza de equipo para la selección del EPP EPP,, pero nunca ambos. La revisión también aclara que no está permitido usar los resultados del análisis de energía incidente para especi�car la categoría de EPP para relámpago de arco en la Tabla 130.7(C)(16). [130.5(C)] (10) Los requisitos de etiquetado de equipos en campo han sido modi�cados para requerir que la etiqueta sea actualizada donde la evaluación de riesgo de relámpago de arco identi�ca un cambio que vuelve inexacto el contenido de dicha etiqueta. Asimismo, la documentación, instalación, y mantenimiento de la etiqueta de marcado en campo es responsabilidad del dueño del equipo eléctrico. [130.5(D)] (11) Texto Texto adicional ahora proporciona al usuario una frontera junto con los requisitos existentes de 130.6(D). Los elementos conductivos que se estén usando no deben utilizarse dentro de la f rontera de aproximación restringida o donde representen un peligro de contacto eléctrico. [130.6(D)] (12) Una nueva tabla basada en las tareas combina las tablas de c.a. y c.d. que antes estaban separadas y eran utilizadas para determinar cuándo se requiere EPP para relámpago de arco volviéndolas más consistentes y mejorando así su funcionalidad. La nueva Tabla Tabla enumera las tareas, condiciones de los equipos, y EPP para relámpago de arco requerido. Utiliza un formato simple de sí y no de acuerdo a si se requiere o no EPP para relámpago de arco. [130.7(C)(15)(A)(a)] (13) Se agregaron nuevas tablas basadas en los equipos para determinar la categoría de EPP para relámpago de arco, Tabla 130.7(C)(15)(A)(b) para sistemas c.a. y Tabla 130.7(C)(15)(B) 130.7(C)(15)(B) para sistemas c.d. Las tablas enumeran los equipos, las categorías de EPP para relámpago de arco, y las fronteras de relámpago de arco. [T [Tabla abla 130.7(C)(15)(A)(b), 130.7(C)(15 )(A)(b), Tabla 130.7(C)(15)(B)] (14) La categoría 0 de peligro/riesgo ha sido eliminada de la Tabla 130.7(C)(16). Categoría de peligro/riesgo de ahora en más pasará a denominarse categoría de EPP. EPP. La categoría 0 de peligro/riesgo fue eliminada porque la nueva tabla de EPP especi�ca únicamente EPP para trabajo dentro de la frontera de relámpago de arco. Si no existe
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70E-5
CONTENIDOS
Contenidos
Artículo 90
Capítulo 1
..........................................
Introducción
Prácticas de trabajo relacionadas con la seguridad .....................................................
100 De�niciones ......................................................... 105 Aplica Aplicació ción n de de las las prá prácti cticas cas de tra trabaj bajoo relacionadas con la seguridad ............................ 110 Req Requis uisito itoss genera generales les para para prá prácti cticas cas de de trabaj trabajoo relacionadas con la seguridad eléctrica ............. 120 Est Establ ableci eciend endoo una una con condic dición ión de tra trabaj bajoo eléctricamente segura ......................................... 130 Trab rabajo ajoss que invol involucr ucran an riesg riesgos os eléctr eléctrico icoss ........ ........ Capítulo 2
200 205 210
215 220 225 230 235 240 245 250
Introducci Introd ucción ón .... ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ .... Requis Req uisito itoss genera generales les de man manten tenimi imient entoo ......... ............ ... Subest Sub estaci acione ones, s, ens ensamb ambles les de tab tabler leros os de potencia, tableros de distribución, paneles de distribución, centros de control de motores e interruptores de desconexión ............................ Alambr Ala mbrado ado de los los predios predios ...... .......... ........ ........ ........ ........ ........ ........ ...... Equipo Equ iposs de control control .......... .............. ........ ........ ........ ........ ........ ........ ....... ....... ...... Fusibl Fus ibles es e interr interrupt uptore oress automát automático icoss ......... ............. ........ .... Equipo Equ ipo rot rotato atorio rio .... ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ Lugares (clasi�cados como) peligrosos ............. Baterí Bat erías as y cuartos cuartos de bater baterías ías ...... .......... ........ ........ ........ ........ ........ .... Herra Her ramie mienta ntass y equipo equiposs eléctr eléctrico icoss portát portátile iless ..... ..... Equipo Equ ipo de segu segurid ridad ad y pro protec tecció ción n perso personal nal .... ........
Capítulo 3
300 310 320 330 340 350
Requisitos de seguridad relacionados al mantenimiento ............................................
Requisitos de seguridad para equipos especiales .....................................................
Introducci Introd ucción ón .... ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ ........ .... Prácti Prá cticas cas de tra trabaj bajoo rela relacio cionad nadas as con la seguridad para celdas electrolíticas .................... Requis Req uisito itoss de seg seguri uridad dad rel relaci aciona onados dos con baterías y cuartos de baterías .............................. Prácti Prá cticas cas segu seguras ras de de traba trabajo jo rela relacio cionad nadas as con con la seguridad para el uso de láseres ......................... Prácti Prá cticas cas de tra trabaj bajoo rela relacio cionad nadas as con la seguridad: equipo electrónico de potencia ....... Proced Pro cedimi imien entos tos de trab trabajo ajo rel relaci aciona onados dos a la seguridad: laboratorios de investigación y desarrollo .............................................................
70E– 9 70E– 11 70E– 11
Anexo A
Publicaciones referidas referidas ..............................
70E– 57
Anexo B
Publicaciones informativas informativas ........................
70E– 59
Anexo C
Límites de aproximación ............................
70E– 62
Anexo D
Métodos de cálculo de energía energía incidente y frontera de relámpago de arco ..................
70E– 64
Anexo E
Programa de seguridad eléctrica ............... ...............
70E– 73
Anexo F
Procedimiento de evaluación de de riesgos ...
70E– 74
Anexo G
Ejemplo del del procedimiento procedimiento bloqueo/ etiqueta ........................................................
70E– 81
Anexo H
Guía orientativa orientativa para la selección de vestimenta protectora protectora y otros equipos de protección personal personal (EPP) .........................
70E– 84
Anexo I
Informe de trabajo trabajo y lista de veri�cación para la plani�cación ....................................
70E– 87
Anexo J
Permiso de trabajo trabajo eléctrico energizado energizado ...
70E– 87
Anexo K
Categorías generales de peligros eléctricos .....................................................
70E– 91
Anexo L
Aplicación típica típica de salvaguardias salvaguardias en la zona de trabajo de la línea de c eldas .........
70E– 92
Anexo M
Disposición en capas de la vestimenta protectora y valor de la resistencia total total al arco del sistema ...........................................
70E– 93
Ejemplo de procedimie procedimientos ntos y políticas industriales para trabajar cerca de líneas eléctricas y equipo aéreo ............................
70E– 94
Anexo O
Requerimientos de seguridad seguridad relacionados al diseño ................................
70E– 97
Anexo P
Alineamiento de de la implementación implementación de la presente norma con los estándares estándares de gestión de la seguridad y salud ocupacional ................................................. 70E– 98
Índice
..................................................................... 70E– 99
70E– 16 70E– 16 70E– 20 70E– 24 70E– 44 70E– 44 70E– 44
70E– 45 70E– 45 70E– 45 70E– 45 70E– 46 70E– 46 70E– 46 70E– 46 70E– 47 70E– 48 70E– 48
Anexo N
70E– 48 70E– 51 70E– 53 70E– 54 70E– 55
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[email protected].
SEGURIDAD ELÉCTRICA EN LUGARES DE TRABAJO
70E-6
Comité de Correlación Técnica del Código Eléctrico Nacional Michael J. Johnston, Presidente
National Electrical Contractors Association, MD [IM] Kimberly L. Shea, Secretario de registro
National Fire Protection Association, MA Mark W. Earley, Secretario administrativo
National Fire Protection Association, MA James E. Brunssen, Telcordia, NJ [UT]
Rep. de Alliance for Telecommunications Telecommunications Industry Solutions Merton W. Bunker, Jr., U.S. Department of State, VA [U] William R. Drake, Actuant Electrical, CA [M] William T. T. Fiske, Intertek Testing Testing Services, NY [RT] Palmer L. Hickman, Electrical Training Alliance, MD [L] Rep. de International Brotherhood Brotherhood of Electrical Workers David L. Hittinger, Independent Electrical Contractors of Greater Cincinnati, OH [IM] Rep. de Independent Electrical Contractors, Inc.
Daniel J. Kissane, Legrand/Pass & Seymour, NY [M]
Rep. de National Electrical Manufacturers Association John R. Kovacik, Kovacik, UL LLC, IL [RT] Neil F. LaBrake, Jr., National Grid, NY [UT] Rep. de Electric Light & Power Group/EEI Danny Liggett, The DuPont Company, Inc., TX [U] Rep. de American Chemistry Council Richard P. Owen, Oakdale, MN [E] Rep. de International Association of Electrical Inspectors
Suplentes Thomas L. Adams, Engineering Consultant, IL [UT]
(Suplente de N. F. LaBrake, Jr.) Lawrence S. Ayer, Biz Com Electric, Inc., OH [IM] (Suplente de D. L. Hittinger) James T. T. Dollard, Jr Jr., ., IBEW Local Union 98, PA [L] (Suplente de P. L. Hickman) Stanley J. Folz, Morse Electric Company, NV [IM] (Suplente de M. J. Johnston) Ernest J. Gallo, Telcordia Technologies (Ericsson), NJ [UT] (Suplente de J. E. Brunssen) Alan Manche, Schneider Electric, KY [M] (Suplente de W. R. Drake)
Robert A. McCullough, Tuckerton, NJ [E]
(Suplente de R. P. Owen)
Michael E. McNeil, FMC Bio Polymer, ME [U]
(Suplente de D. Liggett)
Mark C. Ode, UL LLC, AZ [RT]
(Suplente de J. R. Kovacik) James F. F. Pierce, Intertek, OR [RT] (Suplente de W. T. Fiske) Vincent J. Saporita, Saporita, Eaton's Bussmann Business, MO [M] (Suplente de D. J. Kissane)
Sin Voto Timothy J. Pope, Canadian Standards Association, Canada [SE]
Rep. de CSA/Canadian Electrical Code Committee
D. Harold Ware, Libra Electric Company, OK [IM]
(Miembro emérito)
Alcance del comité: comité: Este Comité tendrá como principal responsabilidad los documentos
sobre la reducción al mínimo del riesgo de la electricidad como fuente de choque eléctrico, y como fuente potencial de ignición ignición de incendios y explosiones. También También será responsable responsable por el texto sobre la reducción al mínimo de la propagación, debida a instalaciones eléctricas, del fuego y de explosiones.
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[email protected].
PERSONAL DE COMITÉ
Comité Técnico de Seguridad Eléctrica en Lugares de Trabajo David A. Dini, Presidente
UL LLC, IL [RT]
Louis A. Barrios, Shell Global Solutions, TX [U]
Rep. de American Petroleum Institute William Bruce Bowman, Bowman, Fox Systems, Inc., GA [IM] Rep. de Independent Electrical Contractors, Inc. Steven C. Chybowski, Rockwell Automation Inc., WI [M] Carey J. Cook, S&C Electric Company, IL [M] Michael J. Douglas, General Motors Corporation, MI [U] Drake A. Drobnick, Saline, MI [SE] Marcia L. Eblen, Paci�c Gas & Electric, CA [SE] Rep. de ASTM F18-Electrical Protective Equipment for Workers Bobby J. Gray, Hoydar/Buck, Inc., WA [E] Lee R. Hale, Lee Hale Consulting, Inc., IA [M] Rep. de The Aluminum Association, Inc. James B. Hayes, Hayes, Florida Institute of Technology echnology,, FL [U] Palmer L. Hickman, Electrical Training Alliance, MD [L] Rep. de International Brotherhood Brotherhood of Electrical Workers Workers John Luke, The ESCO Group, IA [IM] Rep. de National Electrical Contractors Association
Michael J. Madrigal, Kansas City Power & Light, KS [U]
Rep. de Edison Electric Institute
Mark McNellis, Sandia National Laboratories, NM [U] Daleep C. Mohla, DCM Electrical Consulting Services, Inc., TX
[SE] Rep. de Institute of Electrical & Electronics Engineers, Inc. Dennis K. Neitzel, AVO Tr Training aining Institute, Inc., TX [SE] David A. Pace, Olin Corporation, AL [U] Rep. de American Chemistry Council Vincent J. Saporita, Saporita, Eaton's Bussman Business, MO [M] Rep. de National Electrical Manufacturers Association James G. Stallcup, Stallcup, Grayboy Grayboy,, Inc., TX [SE] Charlie R. Thurmond III, ThyssenKrupp Elevator, Elevator, TN [IM] John M. Tobias, Tobias, U.S. Department of the Army, MD [U] David M. Wallis, U.S. Department of Labor, DC [E] Rodney J. West, Schneider Electric, OH [M] Ron Widup, Shermco Industries, TX [IM] Rep. de InterNational Electrical Testing Testing Association
Suplentes Lawrence S. Ayer, Biz Com Electric, Inc., OH [IM]
(Suplente de W. B. Bowman) John F. F. Boothroyd, Entergy Fossil Operations, TX [U] (Suplente de M. J. Madrigal) Steven D. Corrado, UL LLC, NC [RT] (Suplente de D. A. Dini) Daryld Ray Crow, DRC Consulting, Ltd., WA [M] (Suplente de L. R. Hale) Paul Dobrowsky, Innovative Technology Technology Services, NY [SE] (Suplente de D. C. Mohla) James T. T. Dollard, Jr Jr., ., IBEW Local Union 98, PA [L] (Suplente de P. L. Hickman) Heath Garrison, National Renewable Energy Laboratory, Laboratory, CO [U] (Suplente de M. McNellis) Eric Glaude, Chevron, TX [U] (Suplente de L. A. Barrios) Danny Liggett, The DuPont Company, Inc., TX [U] (Suplente de D. A. Pace)
Kevin J. Lippert, Eaton Corporation, PA [M]
(Suplente de V. J. Saporita) Charles R. Miller, Lighthouse Educational Services, TN [SE] (Suplente de D. A. Drobnick) Thomas D. Norwood, AVO Training Training Institute, TX [SE] (Suplente de D. K. Neitzel) Larry D. Perkins, US Department of Energy, TN [E] (Suplente de B. J. Gray) James W. W. Stallcup, Jr. Jr.,, Grayboy Grayboy,, Inc., TX [SE] (Suplente de J. G. Stallcup) Samuel B. Stonerock, Southern California Edison Company, CA [SE] (Suplente de M. L. Eblen) Terry Te rry Tiede, Schneider Electric, IA [M] (Suplente de R. J. West) James R. White, White, Shermco Industries, Inc., TX [IM] (Suplente de R. Widup) Sin Voto
70E-7
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[email protected].
70E-8
SEGURIDAD ELÉCTRICA EN LUGARES DE TRABAJO
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ARTÍCULO 90
— INTRODUCCIÓN INTRODUCCIÓN
canalizaciones de comunicación y señalización. Esta norma también incluye prácticas seguras de trabajo para empleados que desempeñan otras actividades laborales que puedan expo‐ nerlos a peligros eléctricos, así como prácticas de trabajo segu‐ ras para los siguientes usos: (1) Instal Instalacion aciones es de condu conductore ctoress y equipo equiposs que se conecta conectan n al suministro de electricidad. (2) Instal Instalacion aciones es utilizad utilizadas as por las empresa empresass de energía energía eléc‐ trica, como edi�cios de o�cinas, depósitos, garajes, talle‐ res y edi�cios recreativos que no forman parte integral de una planta generadora, una subestación o un centro de control.
NFPA 70E
Seguridad Eléctrica en Lugares de Trabajo Edición 2015
NOTA IMPORTANTE: Este documento de la NFPA se encuentra disponible para su uso sujeto a consideraciones importantes y descar‐ gos de responsabilidad legales. Estas consideraciones y descargos de responsabilidad aparecen en todas las publicaciones que contienen este documento y pueden encontrarse bajo el título “Consideraciones importantes y descargos en relación a los documentos de NFPA”. Estos también pueden obtenerse a pedido en la NFPA o verse en www.nfpa.org/disclaimers.
Nota informativa: La presente norma trata lo relativo a la seguri‐ dad de los trabajadores cuyas responsabilidades laborales supo‐ nen la interacción con equipos y sistemas eléctricos y la exposición potencial a equipos o partes de circuitos eléctricos energizados. Los conceptos vertidos en esta norma con frecuen‐ cia son adaptados a otros trabajadores cuya exposición a los peli‐ gros eléctricos es involuntaria o no reconocida como parte de sus responsabilidades laborales. El mayor riesgo de sufrir lesiones derivadas de los peligros eléctricos para otros trabaja‐ dores involucra el contacto inadvertido con líneas aéreas de energía y choque eléctrico producido por máquinas, herramien‐ tas y artefactos.
La presente edición 2015 incluye los siguientes recursos útiles para el usuario. Los cambios no editoriales están resalta‐ dos con sombra gris dentro de las secciones y con una línea vertical al lado de los bloques grandes de texto nuevo o con cambios y para tablas nuevas o �guras nuevas o con cambios. Donde se han eliminado uno o más párrafos completos, esta eliminación se señala con un punto (•) entre los párrafos que permanecen sin cambios. El índice tiene ahora encabezados estilo diccionario con identi�cadores útiles en la parte superior de cada página del índice. Una referencia entre corchetes [ ] a continuación de una sección o párrafo indica material que ha sido extraído de otro documento de NFPA. Como ayuda al usuario, el título completo y edición de los documentos de origen de los frag‐ mentos se incluyen en el Anexo A. El texto extraído puede ser
90.2
norma no cubre las prácticas de (B) Fuera de cobertura. Esta norma
•
trabajo relacionadas con la seguridad para los siguientes usos: (1) Instal Instalacion aciones es en barco barcos, s, naves naves acuáti acuáticas cas difer diferentes entes de edi�cios �otantes, equipo rodante ferroviario, aviones o vehículos automotores diferentes de casas móviles y vehí‐ culos de recreo. (2) Instal Instalacion aciones es ferroviar ferroviarias ias para para la la generaci generación, ón, transfor transforma‐ ma‐
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90.3
•
ARTÍCULO 90
EE.UU., bases militares, tierras controladas por autori‐ dades portuarias y departamentos y agencias estatales, y tierras de propiedad de los servicios ferroviarios. ferroviarios. 90.3 Organización de la Norma. Esta norma está dividida en una introducción y tres Capítulos, tal como lo ilustra la Figura 90.3. El Capítulo 1 se aplica en general a lo relativo a las prácti‐ cas de trabajo relacionadas con la seguridad; el Capítulo 2 se aplica a los requisitos de mantenimiento relacionados con la seguridad para los equipos e instalaciones eléctricas en los lugares de trabajo; y el Capítulo 3 complementa o modi�ca el Capítulo 1 con requisitos de seguridad para equipos especiales. Los anexos informativos no son parte de los requisitos de la presente norma sino que se incluyen con propósitos informati‐ vos únicamente. 90.4 Organización. Esta norma está dividida dividida en los siguientes siguientes tres capítulos y dieciséis anexos informativos: (1) Capít Capítulo ulo 1, 1, Prácticas Prácticas de trabajo trabajo relaci relacionada onadass con la la seguridad. (2) Capít Capítulo ulo 2, Requis Requisitos itos de segur seguridad idad relaci relacionado onadoss al mantenimiento. (3) Capít Capítulo ulo 3, Requisi Requisitos tos de seguri seguridad dad para para los equip equipos os especiales. (4) Anexo Inform Informativo ativo A, Publica Publicacione cioness de referen referencia. cia. (5) Anexo Inform Informativo ativo B, Referenc Referencias ias inform informativa ativas. s. (6) Anexo Inform Informativo ativo C, Límites Límites de aproxim aproximación ación.. (7) Anexo Inform Informativo ativo D, D, Métodos Métodos de cálcu cálculo lo de energí energíaa incidente y frontera de relámpago de arco. (8) Anexo Informa Informativo tivo E, Program Programaa de segurida seguridadd eléctrica. eléctrica. (9) Anexo Inform Informativo ativo F, F, Procedimi Procedimiento ento de evalua evaluación ción de riesgos.
— INTRODUCCIÓN INTRODUCCIÓN
(17) Anexo Inform Informativo ativo N, Ejemplo Ejemplo de procedi procedimient mientos os y políticas para trabajos cerca de equipos y líneas aéreas industriales. (18) Anexo Inform Informativo ativo O, O, Requerimi Requerimientos entos de de diseño diseño relacio‐ relacio‐ nados a la seguridad. (19) Anexo Informa Informativo tivo P, P, Alineamient Alineamientoo de la implementa implementa‐‐ ción de esta Norma con los estándares de gestión de seguridad y salud ocupacional. 90.5 Reglas mandatarias, reglas permisivas y material explica‐ tivo.
Reglas mandatarias de esta norma norma son aquellas que identi�can acciones que son especí�camente requeridas o prohibidas y están caracterizadas por el uso de los términos debe/deben o no debe/deben. (B) Reglas permisivas. Reglas permisivas permisivas de esta norma son aquellas que identi�can acciones que son permitidas pero no son requeridas, son normalmente utilizadas para describir métodos alternativos u opciones, y están caracterizadas por el uso de los términos será permitido/se permitirá o no será requerido/no se requerirá. refe‐ (C) Material explicativo. Material explicativo como ser refe‐ rencias a otras normas, referencias a secciones relacionadas de esta norma, o información relacionada con alguna de las reglas de la presente norma, se incluye en esta norma en la forma de notas informativas. Dichas notas son simplemente informativas y no son de carácter exigible como sí lo son los requisitos de la presente norma. Los corchetes que contienen referencias de secciones a otro documento de la NFPA tienen únicamente propósito informa‐ (A) Reglas mandatarias.
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[email protected].
ARTÍCULO 100 — DEFINICIONES
Capítulo 1 Prácticas de trabajo relacionadas con la seguridad ARTÍCULO 100 De�niciones Alcance. Este artículo artículo contiene únicamente únicamente las de�niciones
esenciales para la aplicación adecuada de esta norma. No se pretende incluir los términos generales ni los términos técnicos comúnmente de�nidos en otros códigos y normas relaciona‐ das. En general, en el Artículo 100 se de�nen únicamente los términos utilizados en dos o más artículos. Se incluyen otras de�niciones en el artículo en el cual se usan, pero pueden estar referenciadas en el Artículo 100. Las de�niciones presen‐ tadas en este artículo se deben aplicar donde quiera que los términos se utilicen en esta norma. Accesible (como se aplica a los los equipos) [ Accessible (as applied
Equipo que permite permite una aproximación cercana; no resguardado por puertas con cerraduras, altura, u otros medios efectivos. [70:100] to equipment) ].
Accesible (como se aplica aplica a los métodos de alambrado) alambrado) [ Acces‐
Que se puede puede quitar o exponer sin dañar la estructura o acabados del edi�cio, o que no está rodeado permanentemente por la estructura o acabado del edi�cio. [70:100] sible (as applied to wiring methods) ].
Accesible, fácilmente fácilmente (fácilmente accesible) accesible) [ Accessible, Readily ]. puede alcanzarse rápidamente
sistemas fotovoltaicos solares, otros sistemas de generación distribuida, o generadores. Análisis de la energía incidente incidente (Incident Energy Analysis ). ). Un componente de la evaluación de riesgo de relámpago de arco que se utiliza para predecir la energía incidente de un relám‐ pago arco para un set especí�co de condiciones. Aprobado ( Approved ). ). Aceptable por la la Autoridad Autoridad Compe‐ tente. Arco nominal o valor de resistencia resistencia al arco (RA) [ Arc ]. Arc Rating ].
Valor atribuido a los materiales que describe su desempeño al exponerlos a la descarga de un arco eléctrico. El valor de resis‐ tencia al arco se expresa en cal/cm2 y se deriva del valor deter‐ minado para su desempeño termal al arco (VDTA o ATPV por sus siglas en inglés) o la energía del umbral de ruptura (EBT) (si un sistema de materiales exhibió una respuesta de ruptura inferior al valor de ATPV). El valor de resistencia al arco se expresa en ATPV o EBT, según cuál sea el valor inferior. Nota informativa No. 1: La vestimenta o equipos resistentes al arco indican que estos han sido sometidos a prueba por exposi‐ ción a un arco eléctrico. La vestimenta resistente a llamas sin un valor de resistencia al arco no ha sido sometida a prueba por exposición al arco eléctrico. Toda la vestimenta resistente al arco es también resistente a la llama. Nota informativa No. 2: Ruptura es es la respuesta de un material que se evidencia por la formación de uno o más agujeros en la capa más interna del material resistente al arco que permitirían
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ARTÍCULO 100 — DEFINICIONES
eros, el jefe de una o�cina de prevención de incendios, un departamento del trabajo, un departamento de salud; el admin‐ istrador del edi�cio; el inspector eléctrico, u otros que tengan autoridad estatutaria. Para propósitos de seguros, un departa‐ mento de inspección de seguros, una o�cina de avalúos u otro representante de la compañía de seguros pueden ser Autoridad Competente. En muchas circunstancias, el propietario del predio o su agente designado asume la función de Autoridad Competente. En instalaciones gubernamentales, el o�cial al mando o el funcionario del departamento gubernamental pueden ser la Autoridad Competente.
Conductores aéreos entre el sistema de suministro eléctrico de la compañía de elec‐ tricidad y el punto de acometida. [70:100] obstrucción física tal como cintas, cintas, Barricada ( Barricade ). ). Una obstrucción conos, o estructuras con bastidor en 'A de madera o metal, con el propósito de advertir y limitar el acceso. Canalización (Raceway ). ). Conducto encerrado construido con materiales metálicos o no metálicos, expresamente diseñado para contener alambres, cables o barras conductoras, con las funciones adicionales que permita esta norma. [70:100] Centro de control de de motores (Motor Control Center ). ). Ensam‐ ble de una o más secciones encerradas que tienen barras de energía comunes y que contienen principalmente unidades de control de motores. [70:100] Circuito ramal (Branch Circuit ). ). Conductores de circuito entre el dispositivo �nal contra sobrecorriente que protege el circuito y la/las salida(s). [70:100] Bajada de acometida (Service Drop ). ).
Clavija de conexión (clavija macho) (clavija) [ Attachment Plug mediante inserción (Plug Cap) (Plug) ]. Dispositivo que mediante
Nota informativa No. 2: Ver 250.118 de NFPA 70, Código Eléctrico Nacional , para un listado de conductores aceptables de puesta a tierra de los equipos. Conductor del electrodo de puesta a tierra ( Grounding Elec‐ conectar el conduc‐ trode Conductor ). ). Conductor utilizado para conectar
tor puesto a tierra del sistema o el equipo al electrodo de puesta a tierra o a un punto en el sistema del electrodo de puesta a tierra [70:100] Conductor puesto a tierra (Grounded Conductor ). ). Conductor de un sistema o de un circuito intencionalmente puesto a tierra. [70:100] Controlador (Controller ). ). Dispositivo o grupo grupo de de dispositivos dispositivos que sirven para gobernar, de algún modo predeterminado, la potencia eléctrica suministrada al aparato al que está conec‐ tado. [70:100]
Corriente nominal de cortocircuito ( Short-Circuit Current
Posible corriente corriente simétrica de falla a tensión nominal, a la cual un aparato o un sistema puede estar conectado sin sufrir daño que exceda los criterios de aceptación de�nidos. [70:100] Corriente nominal de interrupción (Interrupting Rating ). ). La máxima corriente a la tensión nominal, que un dispositivo eléc‐ trico es identi�cado que tiene previsto interrumpir, bajo condi‐ ciones normalizadas de ensayo. [70:100] ). Rating ).
Nota informativa: Los equipos destinados para interrumpir el �ujo de corriente, a distintos niveles del de falla, pueden tener su corriente de interrupción nominal designada en otros pará‐ metros, como la potencia en caballos de fuerza o la corriente de rotor bloqueado.
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ARTÍCULO 100 — DEFINICIONES
Dispositivo de protección protección contra sobrecorriente tipo limitador de corriente (Current-Limiting Overcurrent Protective Device ). ). Un
dispositivo que, cuando interrumpe corrientes en su rango de limitación de corriente, reduce el �ujo de corriente del circuito con falla a una magnitud substancialmente menor a la que podría obtenerse en un circuito similar si el dispositivo fuera a reemplazarse por uno con un conductor sólido de simi‐ lar impedancia. Edi�cio (Building ). ). Construcción independiente o que está aislada de otras estructuras anexas por muros cortafuegos, con todas sus aberturas protegidas por puertas cortafuegos aproba‐ das. [70:100] Electrodo de puesto a tierra (Grounding Electrode ). ). Un objeto conductor a través del cual se establece una conexión directa a tierra. [70:100] Encerrado (Enclosed ). ). Rodeado por por una caja, carcasa, carcasa, cerca, o paredes, que impiden que las personas entren accidental‐ mente en contacto con partes energizadas.[70:100]
Expuesto (como se aplica a conductores eléctricos energiza‐ dos o partes de circuitos) [Exposed (as applied to energized electri‐ cal conductors or circuit parts)]. Que por descuido puede ser
tocado por una persona o que es posible que q ue ella pueda aproxi‐ marse a él a una distancia menor que la de seguridad. Se aplica a los conductores eléctricos o partes del circuito que no están apropiadamente resguardadas, separadas, o aisladas. Expuesto (como se aplica a los métodos de alambrado) [Exposed (as applied to wiring methods) ]. Colocado sobre una super�cie o
asegurado a ella o detrás de paneles diseñados para permitir el acceso. [70:100] Falla a Tierra (Ground Fault ). ). Una conexión conductora eléc‐ trica no intencional entre un conductor no puesto a tierra de un circuito eléctrico y los conductores normalmente no porta‐ dores de corriente, como envolventes metálicos, canalizaciones metálicas, equipos metálicos o tierra. Frontera de relámpago de arco ( Boundary, Arc Flash ). ).
Cuando existe un peligro de relámpago de arco, el límite de
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ARTÍCULO 100 — DEFINICIONES
Nota informativa: Los medios de apertura automática pueden ser: integrados, de acción directa con el interruptor automático, o situados a distancia del mismo (remotos). Interruptor de circuito contra fallas a tierra (GFCI) [ Ground- Fault Circuit Interrupter (GFCI)]. Dispositivo destinado a la
protección de las personas, que funciona desenergizando un circuito o parte de éste dentro de un período de tiempo deter‐ minado, cuando una corriente a tierra supera los valores esta‐ blecidos para un dispositivo de Clase A. [70:100] Nota informativa: Los interruptores de circuito contra fallas a tierra de Clase A se disparan cuando la corriente a tierra es de 6 mA o más y no se disparan cuando la corriente a tierra es infe‐ rior a 4 mA. Para información adicional, véase la norma ANSI/ UL 943, Norma para interruptores de circuito por falla a tierra. Interruptor desconectador (Interrupter Switch ). ). Interruptor
capaz de establecer, conducir e interrumpir corrientes especi�‐ cadas.
Listado (Certi�cado) [ Listed ]. ]. Equipos, materiales o servicios
Peligro de choque (Shock Hazard ). ). Una condición peligrosa
asociada con la posible liberación de energía causada por el contacto o aproximación con conductores o partes del circuito eléctrico energizado. Peligro eléctrico eléctrico (Electrical Hazard ). ). Una condición peligrosa tal que el contacto o la falla de equipos pueden resultar en un choque eléctrico, quemadura de relámpago de arco, quema‐ dura térmica, o ráfaga. Nota informativa: Las fuentes de potencia Clase 2, sistemas de iluminación de baja tensión y fuentes similares, son ejemplos de circuitos o sistemas que no son considerados un peligro eléc‐ trico. Peligro de relámpago de arco arco ( Arc Flash Hazard ). ). Condición peligrosa asociada con la posible liberación de energía causada por un arco eléctrico.
Nota informativa No. 1: Puede existir un riesgo de relámpago de arco cuando partes de circuitos o conductores eléctricos energi‐ zados están expuestos o cuando están en el interior de equipos
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ARTÍCULO 100 — DEFINICIONES
Receptáculo (Receptacle ). ). Dispositivo de contacto instalado
en la salida para que se conecte a él una clavija de conexión. Un receptáculo individual es un dispositivo de contacto individ‐ ual sin ningún otro dispositivo de contacto en el mismo yugo. Un receptáculo múltiple es un dispositivo que contiene dos o más dispositivos de contacto en el mismo yugo. [70:100] Resguardado (Guarded ). ). Cubierto, blindado, cercado, encer‐ rado, o protegido de otra manera por medio de cubiertas, carcasas, barreras, rieles, pantallas, rejillas, o plataformas, adecuadas para eliminar la posibilidad de aproximación o contacto de personas u objetos a un punto peligroso. [70:100] Riesgo (Risk). Una combinación combinación de las probabilidades de ocurrencia de heridas o daño a la salud y la severidad de las heridas o el daño a la salud que resulta de un peligro. Salida ( Outlet ). ). Punto de una instalación instalación en el que se toma corriente para suministrarla a un equipo de utilización. [70:100]
Tablero de potencia con revestimiento metálico (Switchgear, ). Tablero totalmente encerrado en todos sus lados Metal-Clad ).
y la parte superior con láminas metálicas, que tiene dispositivos de interrupción y conmutación extraíbles, y todas las partes vivas encerradas en compartimientos compartimientos metálicos puestos a tierra. Tablero resistente al arco (Switchgear, Arc-Resistant ). ). Equipo diseñado para resistir los efectos de una falla de arco interna y que direcciona la energía producida internamente lejos del empleado. Tensión de paso (Step Potential ). ). Una diferencia de gradiente de potencial a tierra, que puede hacer que �uya corriente de un pie a otro a través del cuerpo. Tensión de toque (Touch Potential ). ). Una diferencia de gradiente de potencial a tierra, que puede producir �ujo de corriente de una mano a otra, o mano a pie, u otro camino, diferente al de pie a pie, a través del cuerpo. Tensión (de un circuito) [Voltage (of a circuit)]. La mayor
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ARTÍCULO 110 — REQUISITOS GENERALES PARA PRÁCTICAS DE TRABAJO
Unidad de vivienda (Dwelling Unit ). ). Unidad individual que
brinda instalaciones completas e independientes de vivienda para una o más personas, que incluye instalaciones perma‐ nentes para descansar, dormir, dormir, cocinar y sanitarias. [70:100] Unido (Unión) [Bonded (Bonding)]. Conectado para esta‐ blecer continuidad y conductividad eléctricas. [70:100]
RELACIONADASS CON LA SEGURIDAD ELÉCTRICA RELACIONADA
mantenimiento apropiado, técnicas de alerta, requisitos de audi‐ toría, y requisitos de entrenamiento provistos en esta norma son controles administrativos y parte de un programa integral de seguridad eléctrica. Nota informativa No. 2: ANSI/AIHA Z10, Norma nacional de los Estados Uni dos para sistemas de gestión de segurida d y salud ocupa cio‐ nal, provee el marco para establecer un programa de seguridad eléctrica general como uno de los componentes del programa de seguridad y salud ocupacional del empleador. empleador.
ARTÍCULO 105
Aplicación de las prácticas de trabajo relacionadas con la seguridad Capítulo 1 trata lo lo relativo a las prácticas y 105.1 Alcance. El Capítulo los procedimientos de trabajo relacionados con la seguridad
Nota informativa No. 3: IEEE 3007.1, Práctica recomendada para la operación y gestión de sistemas de potencia comerciales e industriales, proporciona orientación adicional para la imple‐ mentación del programa de seguridad eléctrica. Nota informativa No. 4: IEEE 3007.3, Práctica recomendada para la seguridad eléctrica en sistemas de potencia comerciales e industriales, proporciona orientación adicional para la seguri‐ dad eléctrica en el lugar de trabajo. (B) Mantenimiento. El programa programa de de seguridad eléctrica debe debe
incluir elementos que consideren la condición del manteni‐
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ARTÍCULO 110 — REQUISITOS GENERALES PARA PRÁCTICAS DE TRABAJO
nidense para Sistemas de Gestión de Seguridad y Salud Ocupacional es
la siguiente: (1) Eliminaci cióón (2) Sustituci cióón (3)) Co (3 Cont ntro role less de de in inge geni nier ería ía (4) Advertencia (5)) Co (5 Cont ntro role less admin adminis istr trat ativ ivos os (6) EPP
•
(H) Sesión informativa de trabajo. Antes de comenzar cada
trabajo, el empleado responsable debe realizar una sesión informativa de trabajo (resumen del trabajo) con los emplea‐ dos involucrados. La sesión informativa debe abarcar temas tales como: los peligros asociados al trabajo, procedimientos de
110.2
(B) Tipo de entrenamiento. El entrenamiento exigido por
esta sección debe ser en salón o en el sitio de trabajo o una combinación de los dos. El grado de entrenamiento que se imparta se debe determinar por el riesgo hacia el empleado. (C) Entrenamiento en respuesta de emergencias.
Los empleados expuestos al peligro de choque deben ser entrenados sobre métodos para liberar a las víctimas del contacto con conductores eléctri‐ cos expuestos o partes de circuitos energizados. El reen‐ trenamiento (o curso de actualización) debe realizarse anualmente.
(1)
Liberar del contacto.
(2)
Primeros auxilios, respuesta de emergencias, y resucita-
Nota informativa No. 2: El procedimiento de evaluación de riesgo puede incluir la identi�cación de cuándo podría requer‐ irse una segunda persona y el entrenamiento y los equipos que esa persona debería tener. Nota informativa No. 3: Para un ejemplo de procedimiento de evaluación de riesgo, consulte el Anexo Informativo F.
RELACIONADASS CON LA SEGURIDAD ELÉCTRICA RELACIONADA
ción.
(a) Los empleados responsables de la respuesta a emer‐ emer‐ gencias médicas deben ser entrenados en primeros auxilios y procedimientos de emergencia. (b) Los empleados responsables de la la respuesta respuesta a emer‐ gencias médicas deben ser entrenados en el uso del des�brila‐
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[email protected].
110.2 ARTÍCULO 110 — REQUISITOS GENERALES PARA PRÁCTICAS DE TRABAJO RELACIONADAS CON LA SEGURIDAD ELÉCTRICA
(b) Tales perso personas nas a quiene quieness se les permit permitee trabajar trabajar dentro de la frontera de aproximación limitada deben, como mínimo, recibir entrenamiento adicio‐ nal en todo lo siguiente: (1) Las destrezas y técnicas necesarias para para distinguir distinguir entre conductores y partes de circuitos eléctricos energizados
(2) Si nueva nueva tecno tecnolog logía, ía, nuevo nuevoss tipos tipos de equipo equipo,, o cambios en los procedimientos necesitan del uso de prácticas de trabajo relacionadas con la seguridad que son diferentes de aquellas que el empleado normalmente utilizaría. (3) Si él o ella ella deben deben impl impleme ementa ntarr prácti prácticas cas de de trabajo relacionadas con la seguridad que no
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ARTÍCULO 110 — REQUISITOS GENERALES PARA PRÁCTICAS DE TRABAJO
(3) Las medid medidas as que el contrati contratista sta haya haya tomado tomado para para correg corregir ir las violaciones reportadas por el empleador an�trión bajo 110.3(A)(2) y para prevenir que estas violaciones vuelvan a ocurrir en el futuro. (C) Documentación. Donde el empleador an�trión conozca peligros que estando cubiertos en esta norma se relacionen
RELACIONADASS CON LA SEGURIDAD ELÉCTRICA 110.4 RELACIONADA
(b) Las clavijas clavijas de conexión y los receptáculos receptáculos no se deben conectar o alterar de una manera que pueda interrum‐ pir la continuidad del conductor de puesta a tierra de equipos. Adicionalmente, estos dispositivos no deben alterarse para permitir el uso de una manera diferente a la prevista original‐ mente por el fabricante. (c) deben utilizar adaptadores interrumpan la
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110.4
ESTABLECIENDO UNA CONDICIÓN DE ARTÍCULO 120 — ESTABLECIENDO
(6) Instrucciones del fabricante. Los equipos portátiles deben
ser usados en concordancia con las instrucciones y advertencias de seguridad del fabricante. (C) Protección con interruptores de circuito circuito por fallas a tierra (GFCI).
TRABAJO ELÉCTRICAMENTE SEGURA
diagramas y etiquetas de identi�cación, que sean aplica‐ bles y se encuentren actualizados. (2) Desp Después ués de inter interrump rumpir ir la corri corriente ente de de carga carga apropiad apropiada‐ a‐ mente, abrir el/los dispositivo(s) de desconexión para cada fuente. (3)) Si (3 Siem empr pree que que sea sea posi posibl ble, e, veri�car visualmente que todas las cuchillas de los dispositivos de desconexión estén
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ESTABLECIENDO UNA CONDICIÓN DE ARTÍCULO 120 — ESTABLECIENDO (B) Principios de la ejecución de de bloqueo/etiqueta.
Toda persona que pueda estar directa o indirectamente expuesta a una fuente de ener‐ gía eléctrica debe participar en el proceso de bloqueo y etique‐ tado. (1) Participación del empleado.
TRABAJO ELÉCTRICAMENTE SEGURA
120.2
por parte de los empleados, y auditar el procedimiento para corregir de�ciencias y mejorar su alcance. (2) Forma de control. Se permitirán permitirán dos dos formas de control de los peligros de la energía eléctrica: bloqueo/etiqueta simple, y bloqueo/etiqueta complejo [ver 120.2(D) ]. Para el bloqueo/ etiqueta simple, la persona cali�cada debe estar a cargo. Para
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120.2
ESTABLECIENDO UNA CONDICIÓN DE ARTÍCULO 120 — ESTABLECIENDO
TRABAJO ELÉCTRICAMENTE SEGURA
complejo deben establecer un método para llevar registro de todas las personas que puedan estar expuestas a peligros eléc‐ tricos en el transcurso del bloqueo/etiquetado.
responsable, cuando así lo disponga el procedimiento estable‐ cido.
(3) Coordinación.
(a) El dispositivo dispositivo etiqueta debe incluir incluir una etiqueta junto con los medios de �jación. (b) El dispositivo etiqueta debe fácilmente identi�ca‐
(a) El procedimiento eléctrico de bloqueo/etiqueta esta‐ blecido se debe coordinar con todos los otros procedimientos
(4) Dispositivo de etiqueta.
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
A.3.3
ANEXO INFORMATIVO INFORMATIVO A
ASTM F1505, Especi�cación normalizada para herramientas manuales aisladas y aislantes , 2010. (Standard Speci�cation for for Insu‐ lated and Insulating Hand Tools. )
mining the Protective Performance of an Arc Protective Blanket for Elec‐ tric Arc Hazards. ) normalizada para dentales eléctrica‐ ASTM F2677, Especi�cación normalizada mente aislantes , 2008a. (Standard Speci�cation for for Electrically Insu‐ lating Aprons.)
de desempeño normalizada para mate‐ ASTM F1506, Especi�cación de riales textiles resistentes a las llamas y con valor de resistencia al arco para indumentaria indumentaria para uso de trabajadores eléctricos expuestos a ries‐ gos de arco eléctrico momentáneo y a los riesgos térmicos relacionados , Standard d Performance Speci�cation for for Flame Resistant and 2010a. (Standar Arc Rated Textile Materials for Wearing Apparel for Use by Electrical Workers Exposed to Momentary Electric Arc and Related Thermal Hazards. )
ASTM F2757, Guía normalizada para el cuidado, mantenimiento y lavado doméstico de la ropa resisten resistente te al fuego, energía térmica, y descarga de arco , 2009. (Standard Guide for Home Laundering Care and Maintenance of Flame, Thermal and Arc Resistant Clothing. ) International Commission on Radiological Protection, SE-171 16 Stockholm, Sweden. (Comi‐ sión Internacional sobre Protección radiológica. ) ICRP Publicación 33, Protección contra la radiación ionizante
A.3.3 Publicaciones ICRP ICRP..
ASTM F1742, Especi�cación normalizada para láminas de PVC aislantes , 2003 (R 2011). (Standard Speci�cation for for PVC Insulating Sheeting. )
proveniente de fuentes externas proveniente externas utilizadas utilizadas en medicina, medicina, Publicación 33, 33, Marzo 1981. (Protection Against Ionizing Radiation from External Sources Used in Medicine.)
normalizada para prendas impermea‐ ASTM F1891, Especi�cación normalizada bles resistentes a llamas y arcos , 2012. (Standard Speci�cation for Arc and Flame Resistant Rainwear.) Rainwear.) ASTM F1959/F1959M, Método de prueba normalizado para
IEC. International Electrotechnical Commission, 3, rue de Varembé, P.O. Box 131, CH-1211 Internacional l .) Geneva 20, Switzerland. (Comisión Electrotécnica Internaciona .) IEC 60479, Efectos de la corriente eléctrica en el cuerpo humano.
A.3.4 Publicaciones
determinar el nivel de protección al arco de los materiales para vesti‐ menta , 2012. (Sta Stand ndar ard d Test Test Meth Method od for Det Determ ermini ining ng th thee Ar Arcc Ra Ratin ting g of Materials for Clothing. )
(Effects of Current Passing Through the Body.)
ASTM F2178, Método de prueba normalizado para determinar el valor de resistencia al arco y especi�cación normalizada normalizada para productos de protección para la cara , 2012. (Standard Test Method for Determin‐ ing the Arc Rating and Standard Speci�cation for for Face Protective Prod‐ ucts.)
60479-1 Parte 1: Aspectos generales, 2005. 60479-1-1 Capítulo 1: Impedancia eléctrica del cuerpo humano. 60479-1-2 Capítulo 2: Efectos de la corriente alterna (CA) en el rango de 15 Hz a 100 Hz. 60479-2 Parte 2: Aspectos especiales, 2007. 60479-2-4: Capítulo 4: Efectos de la corriente alterna (CA) con frecuencias superiores a 100 Hz. 60479-2-5 Capítulo 5: Efectos de las formas de onda de la corriente especiales. 60479-2-6 Capítulo 6: Efectos de las corrientes de impulso único unidireccionales de corta duración. A.3.5 Publicaciones IEEE. Institute of Electrical and Electron‐ Electron‐ ics Engineers, IEEE Operations Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08855-1331. (Instituto de Ingenieros Eléc‐ tricos y Electrónicos, Centro de operaciones del IEEE ) IEEE C37.20.7, Guía para la prueba de tableros de conmutación
normalizada para métodos de prueba ASTM F2249, Especi�cación normalizada en servicio para conjuntos de montaje de puentes de puesta a tierra temporal que se usen en equipos y líneas de energía eléctrica desenergi‐ zados , 2003 (R 2009). (Standard Speci�cation for In-Service Test Methods for Temporary Grounding Jumper Assemblies Used on De- Energized Electric Electric Power Lines and and Equipment. Equipment. )
ASTM F2412/F2320, Métodos de prueba para forros aislantes de hule , 2011. (Standard Speci�cation for for rubber insulating sheeting ) ASTM F2412, Métodos de prueba normalizados para la protección de los pies , 2011. (Standard Test Methods for Foot Protections. ) ASTM F2413, Especi�cación normalizada para los requisitos de desempeño para el calzado de protección con puntera (de seguridad) , 2011. (Standard Speci�cation for Performance Requirements for Protective (Safety) Toe Cap Footwear ) ASTM F2522, Método de prueba normalizado para la determina‐ ción del desempeño protector de un medio de protección instalado en herramientas de líneas vivas o en varas para operaciones en estanterías para riesgos de arco eléctrico, 2012. (Standard Test Method for Deter‐ mining the Protective Performance of a Shield Attached on Live Line Tools or on Racking Rods for Electric Arc Hazards. )
con cerramientos de metal certi�cados para para hasta 38 kV para fallas por formación de arcos internos , 2007/Corrigendum 1, 2010. ( Guide for Testing Metal-Enclosed Switchgear Rated up to 38 kV for Internal Arcing Faults. ) •
A.4 Referencias para extractos en secciones secciones mandatarías
ASTM F2676, Método de prueba normalizado para la determina‐ ción del desempeño protector de una manta de protección contra arcos para riesgos de arco eléctrico , 2009. (Standard Test Method for Deter‐
NFPA 70®, Código Eléctrico Nacional , edición 2014. •
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
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ANEXO INFORMATIVO INFORMATIVO B
B.1.6
Anexo Informativo B Publicaciones informativas Los siguientes documentos o fragmentos de ellos están referenciados dentro de esta norma para propósitos informativos solamente y por lo tanto no forman parte de los requisitos de este documento a menos que también se encuentren listados en el Anexo informativo A. B.1.1 Publicaciones NFPA. National Fire Protection Associa‐ tion, 1 Batterymarch Park, Quincy, MA 02169-7471. NFPA 1, Código de Incendios , edición 2015. NFPA 70®, Código Eléctrico Nacional , edición 2014. NFPA 70B, Práctica recomendada para el mantenimiento de equi‐ pos eléctricos , edición 2013. NFPA 79, Norma sobre electricidad para maquinaria industrial , edición 2015. B.1.2 Publicaciones ANSI. American National Standards Insti‐ tute, 25 West 43rd Street, 4th Floor Floor,, New York, NY 10036. ANSI/AIHA Z10, Norma nacional de los Estados Unidos para sistemas de gestión de la seguridad y salud ocupacional , 2012. (Amer‐ ican National Standard for Occupational Health and Safety Management Systems.) ANSI/ASSE Z244.1, Control de la energía peligrosa — Bloqueo/ etiqueta y métodos alternativos, 2003 (R 2008). (Control of Hazardous Energy — Lockout/Tagout and Alternative Meth‐ ods.) ANSI C84.1, Sistemas y equipos eléctricos de potencia – valores nominales de voltaje (60 Hz) , 2011. [ Electric Power Systems and Equipment – Voltage Voltage Ratings Ratings (60 Hz).] ANSI/ISO 14001, Sistemas de gestión ambiental — Requisitos con guía para uso , 2004/Corrigenda 1, 2009. ( Environme Environmental ntal Manage‐ Manage‐ ment Systems —Requirements with Guidance for Use ) de las pruebas ANSI/NETA ANSI/NET A MTS, Norma para las especi�caciones de
de desempeño normalizada para mate‐ ASTM F1506, Especi�cación de riales textiles resistentes a las llamas para indumentaria para uso de trabajadores trabajador es eléctricos expuestos a riesgos de arco eléctrico momentáneo y a los riesgos térmicos relacionados, relacionados, 2010a (Standar Standard d Performance Spec‐ i�cation for Flame Resistant Textile Materials for Wearing Apparel for Use by Electrical Workers Exposed to Momentary Electric Arc and Rela‐ ted Thermal Hazards. )
B.1 Publicaciones referidas.
ASTM F1959/F1959M F1959/F1959M,, Método de prueba normalizado para determinar el nivel de protección al arco de los materiales para vesti‐ menta, 2012. (Standard Test Method for Determining the Arc Thermal Performance Value of Materials for Clothing. ) normalizada para métodos de prueba ASTM F2249, Especi�cación normalizada en servicio para conjuntos de montaje de puentes de puesta a tierra temporal que se usen en equipos y líneas de energía eléctrica desenergi‐ zados , 2003 (R2009). (Standard Speci�cation for In-Service Test Methods for Temporary Grounding Jumper Assemblies Used on De- Energized Electric Electric Power Lines and and Equipment. Equipment. )
ASTM F2413, Estándar de especi�cación de requerimientos de desempeño para el calzado de protección (seguridad) con puntera, 2011. (Standard Speci�cations for Performance Requirements for Protective (Safety) Toe Cap Footwear .)
ASTM F2757, Guía normalizada para el cuidado, mantenimiento y lavado doméstico de la ropa resistente al fuego, energía térmica, y descarga de arco, 2009. (Standard Guide for Home Laundering Care and Maintenance of Flame, Thermal and Arc Resistant Clothing. ) B.1.4 Publicaciones OHSAS. British Standards Institute (Insti‐
de mantenimiento para equipos y sistemas de distribución de energía eléctrica , 2011. (Standard for Maintenance Testing Speci�cation for Electrical Power Distribution Distribution Equipment Equipment and Systems. Systems. )
ANSI Z535.4, Señales y etiquetas de seguridad de los productos, 2011 (Product Safety Signs and Labels. ) B.1.3 Publicaciones ASTM. ASTM International, 100 Barr Harbor Drive, P.O. Box C 700, West Conshohocken, PA 19428-2959. normalizada para el cuidado en servi‐ ASTM F496, Especi�cación normalizada cio de guantes y mangas aislantes , 2008. (Standard Speci�cation for In-Service Care of Insulating Gloves and Sleeves. ) normalizada para tubos y varillas de ASTM F711, Especi�cación normalizada plástico reforzado con �bra de de vidrio (FRP) que se usen en herramien‐ tas de líneas vivas , 2002 (R 2007). [Standard Speci�cation for Fiberglass-Reinforced Fiberglass-Reinf orced Plastic (FRP) Rod and Tu Tube be Used; in Line
•
tuto Británico de Normas), Occupational Health and Safety Assessment Series (OHSAS), (Serie de evaluación de la seguri‐ dad y salud ocupacional), Project Group Publications. British Standards Institute, American Headquarters, 12110 Sunset Hills Road, Suite 200, Reston VA 20190-5902. BS OSHAS 18001, Sistemas de gestión de la seguridad y salud ocupacional , 2007. (Occupational Health and Safety Management Systems.) B.1.5 Publicaciones CSA. Canadian Standards Association (Asociación Canadiense de Normas), 5060 Spectrum Way, Mississauga, ON L4W 5N6, Canada CAN/CSA Z462, Seguridad eléctrica en el lugar de trabajo , 2012. (Workplace Electrical Safety.) CAN/CSA Z1000, Gestión de la seguridad y salud ocupacional , 2006 (R 2011). (Occupational Health and Safety Management.) B.1.6 Publicaciones IEC. International Electrotechnical Commission (Comisión Electrotécnica Internacional), 3, rue de Varembé, P.O. P.O. Box 131, CH-1211 Geneva 20, Switzerland. IEC 60204-1 ed 5.1 Consol. with am 1, Seguridad de las maquinarias-Equipos eléctricos de maquinarias — Apartado 1: Requi‐ sitos generales, 2009. (Safety of Machinery-Electrical Equipment of
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
B.1.7
ANEXO INFORMATIVO B
Institute of Electrical Electrical and Elec‐ tronic Engineers, IEEE Operations Center, 445 Hoes Lane, P. O. Box 1331, Piscataway, NJ 08855-1331. (Instituto de Ingenieros Eléctricos y Electrónicos, Electrónicos, Centro Centro de operaciones del del IEEE ) ANSI/IEEE C2, Código Nacional de Seguridad Eléctrica, 2012. (National Electrical Safety Code. ) ANSI/IEEE C 37.20.6, Norma para dispositivos de prueba y de B.1.7 Publicaciones IEEE.
puesta a tierra certi�cados para para 4.76 kV a 38 kV que se usen en cerra‐ mientos, 2007. (Standard for 4.76 kV to 38 kV-Rated Ground and Test Devices Used in Enclosures. ) •
•
IEEE 4, Técnicas normalizadas para pruebas de alto voltaje, 2013. (Standard Techniques for High Voltage Testing. ) IEEE 450, Práctica recomendada para el mantenimiento, prueba y reemplazo de baterías de plomo-ácido ventiladas para aplicaciones esta‐ cionarias, 2010. (IEEE Recommended Practice for Maintenance, Test‐ ing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications.)
•
IEEE 516, Guía para métodos de mantenimiento en líneas de corriente eléctrica energizadas energizadas,, 2009 (Guide for Maintenance Methods on Energized Power Lines ). ). IEEE 937, Práctica recomendada para la instalación y manteni‐ miento de baterías de plomo-ácido para sistemas fotovoltaicos, 2007. (Recommended Practice for Installation and Maintenance of Lead- Acid Batteries for Photovoltaic Systems. ) IEEE 946, Práctica recomendada para el diseño de sistemas auxil‐ iares de potencia c.d. para sistemas de generación, 2004. (IEEE Recom‐ mended Practice for the Design of DC Auxiliary Power Systems for Generating Systems .) .)
IEEE 1106, Práctica recomendada para la instalación, manteni‐ miento, prueba y reemplazo de baterías de níquel-cadmio ventiladas para aplicaciones estacionarias, estacionarias, 2005 (R 2011). (IEEE Recommended Practice for Installation, Maintenance, Testing, and Replacement of Vented Ven ted Nickel-Cadmium Batteries for Stationary Applications. ) IEEE 1184, Guía para baterías para sistemas de suministro de energía ininterrumpida, 2006 (IEEE Guide for Batteries for Uninter‐ ruptible Power Supply Systems.) IEEE 1187, Práctica recomendada para el diseño de instalación y la instalación de baterías de plomo-ácido reguladas por válvula, para aplicaciones estacionaria estacionarias, s, 2002. (Recommended Practice for Installa‐ tion Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications.) IEEE 1188, Práctica recomendada para el mantenimiento, prueba y reemplazo de baterías de plomo-ácido reguladas por válvula (VRLA) para aplicaciones estacionarias, 2005 (R2010). [IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications.] •
IEEE 1491, Guía para la selección y uso de equipos de monitoreo de baterías en aplicaciones estacionarias, estacionarias, 2012. (IEEE Guide for Selection and Use of Battery Monitoring Equipment Equipment in Stationary Applications.) IEEE 1584TM, Guía para efectuar el cálculo de peligro de relámpago de arco, 2002. (Guide for Performing Arc Flash Hazard Calculations. )
IEEE 1584bTM, Guía para efectuar el cálculo del riesgo de relám‐ pago de arco, Enmienda 2: cambios a la cláusula 4, 2011, (Guide for Performing Arc Flash Hazard Calculations, Amendment 2: Changes to Clause 4.)
IEEE 1657, Práctica recomendada para las cali�caciones del personal para la instalación instalación y mantenimiento mantenimiento de baterías baterías estacionarias, estacionarias, for Instal‐ 2009. (Recommended Practice for Personnel Quali�cations for lation and Maintenance of Stationary Batteries. ) IEEE 3007.1, Práctica recomendada para la operación de sistemas de energía comercial e industrial, 2010. (IEEE Recommended Practice for the Operation and Managemen Managementt of Industrial and Commercial Power Systems.) IEEE 3007.2, Práctica recomendada para el mantenimiento de sistemas de energía comercial e industrial, 2010. (IEEE Recommended Practice for the Maintenance of Industrial and Commercial Power Systems.) IEEE 3007.3, Práctica recomendada para la seguridad eléctrica en los sistemas de energía comerciales e industriales, 2012. (IEEE Recom‐ mended Practice for Electrical Safety in Industrial and Commercial Power Systems.) Anderson, W. E., “Metodología del análisis de riesgos apli‐ cada al desarrollo de maquinarias industriales”, Transacciones del IEEE sobre aplicaciones industriales, Vol. 41, Nro. 1, Enero/ Febrero 2005, págs. 180–187. (“Risk Analysis Methodology Applied to Industrial Machine Development,” IEEE Transactions on Industrial Applications.) Ammerman, R. F., Gammon, T., Sen, P. P. K., and Nelson, J. P., “Cálculo de la energía incidente y modelos de arco de corriente directa”, Transacciones de aplicaciones industriales del IEEE, Vol. 46, No. 5,
2010. (“DC-Arc Models and Incident-Energy Calculations,” IEEE Transactions on Industrial Applications .) Doan, D. R, “Cálculos de relámpago de arco para exposiciones a sistemas de c.d.”, Transacciones. del IEEE sobre aplicaciones industri‐ ales, Vol 46, No. 6, 2010. (“Arc Flash Calculations for Exposures to DC Systems,” IEEE Transactions on Industrial Applications .)
Doughty, R. L., T. E. Neal, and H. L. Floyd II, “Predicción de la energía incidente para un mejor manejo del riesgo de arco eléctrico en sistemas de distribución de energía de 600 V”, Registro de los artículos de la Conferencia, 45°Conferencia 45°Conferencia Anual de la Industria Química y Petrolera de la IAS del IEEE, Septiembre 28–
30, 1998. (“Predicting Incident Energy to Better Manage the Electric Arc Hazard on 600 V Power Distribution Systems,”
Record of Conference Papers IEEE IAS 45th Annual Petroleum and Chemical Industry Conferen Conference. ce. )
Lee, R., “El otro riesgo eléctrico: quemaduras por relámpago rans nsac acci cion ones es de dell IE IEEE EE so sobr bree ap apli lica caci cion ones es,, de arco arco el eléc éctr tric ico” o”,, Tra Vol. 1A-18 1A-18,, Nro. 3, Mayo/Junio 1982. (“The Other Electrical Hazard: Electrical Arc Flash Burns,” IEEE Trans. Applications.) B.1.8 Publicaciones ISA. Instrumentation, Systems, and Auto‐
mation Society (Sociedad de Instrumentación, Sistemas y Automatización), 67 Alexander Drive, Research Triangle Park, NC 27709.
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
ANEXO INFORMATIVO INFORMATIVO B B.1.9 Publicaciones ISEA. International Safety Equipment Association (Asociación Internacional de Equipos de Seguri‐ dad), 1901 North Moore Street, Arlington, VA 22209-1762. 22209-1762. ANSI/ISEA Z358.1, Norma para estaciones de lavado de ojos y duchas de emergencia, 2009. (American National Standard for Emer‐ gency Eye Wash and Shower Equipment. ) B.1.10 Publicaciones ISO. International Organization for Standardization (Organización Internacional para la Normaliza‐ ción ), ), 1, Ch. de la Voie-Creuse, Case postale 56, CH-1211 Geneva 20, Switzerland. ISO 14001, Sistemas de gestión ambiental — Requisitos con guía para uso, 2004. (Environm (Environmental ental Management Management Systems — Requirement Requirements s with Guidance for Use.)
B.1.11 Publicaciones NIOSH. National Institute for Occupa‐
tional Safety and Health, Centers for Disease Control and Prevention (Instituto Nacional para la Seguridad y Salud Ocupacional, Centros para la Prevención y Control de Enfer‐ medades), 1600 Clipiespieson Road, Atlanta, GA 30333. DHHS (NIOSH) Publicación Nro. 94-110, Manual de aplica‐ ciones para la ecuación de levantamiento modi�cada del NIOSH, 1994. (Publication No. 94-110, Applications Manual for the Revised NIOSH Lifting Equation. )
B.1.14
B.1.12 Publicaciones UL. Underwriters Laboratories Inc., 333 P�ngsten Road, Northbrook, IL
60062-2096.
ANSI/UL 943, Norma para interruptores de circuito por falla a tierra, 2006 Stan anda dard rd fo forr Gr Grou ound nd-F -Fau ault lt Ci Circ rcui uitt In Inte ter‐ r‐ 2006 (R 22012 012). ). (St rupters )
•
B.1.13 Publicaciones del Gobierno de los Estados Unidos.
•
U.S. Government Printing Of�ce, Washington, DC 20402. Título 29, Código de Regulaciones Federales, Apartado 1910, Normas para la seguridad y la salud ocupacional. (Title 29, Code of Federal Regulations, Part 1910, Occupational Safety and Health Standards., Subparte S, Eléctrico, 1910.137, Equipos de protección personal. (Personal Protective Equipment.) y 1910.305(j)(7), Baterías de almacenamiento. (Storage Batteries.); y Parte 1926, Regulaciones de seguridad y salud para construc‐ ciones, Subparte K, Eléctrico (Safety and Health Regulations for Construction, Subpart K, Electrical),1926.441, Baterías y carga de baterías. (Batteries and Battery Charging.)
B.1.14 Otras publicaciones. •
"Evaluación de peligro de arco de corriente directa Fase II", material protegido por derechos de autor, Kinectrics Inc., Informe Nro. K-012623-RA-0002-R00. (DC Arc Hazard Assess‐ ment Phase II Copyright Material Kinectrics Inc. Report No. K-012623-RA-0002-R00.)
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
ANEXO INFORMATIVO INFORMATIVO C
Anexo Informativo Informativo C Límites de aproximació aproximación n Este anexo informativo no es parte de los requerimie requerimientos ntos de este docu‐ mento de la NFPA pero se incluye únicamente con �nes informativos. informativos.
Frontera de relámpago de arco
C.1 Preparación para aproximarse. El mantener una segura
Frontera de aproximación limitada
distancia de aproximación a los conductores o partes de circui‐ tos eléctricos energizados expuestos, es un medio efectivo para mantener la seguridad eléctrica. En la medida en que dismi‐ nuye la distancia entre la persona y los conductores o partes de circuitos energizados expuestos, aumenta el potencial de acci‐ dentes eléctricos.
Espacio limitado
Cualquier punto de un conductor eléctrico o parte de circuito expuesto energizado
C.1.1 Personas no cali�cadas, distancia segura de aproxima‐ ción. Las personas no cali�cadas están seguras cuando mantie‐
nen una distancia de los conductores y partes de circuitos energizados expuestos, incluyendo el objeto conductor más largo que se esté manipulando, de tal manera que ellos no puedan tener contacto o entrar en la distancia de aislamiento de aire especi�cada para los conductores o partes de circuitos eléctricos energizados. Esta distancia segura de aproximación es la frontera límite de aproximación. Además, las personas no deben cruzar la frontera de relámpago de arco a menos que estén vestidos con ropa de protección personal apropiada y se encuentren bajo la estricta supervisión de una persona cali�‐ cada. Las personas no cali�cadas deberían cruzar la frontera de aproximación limitada únicamente cuando se encuentran continuamente escoltadas por una persona cali�cada. Bajo ninguna circunstancia una persona no cali�cada debería cruzar la frontera de aproximación restringida, donde se requieran técnicas o equipos especiales de protección contra choque. C.1.2 Personas cali�cadas, distancia segura de aproximación. C.1.2.1 Determinar la frontera de relámpago relámpago de arco, y si se va a cruzar dicha frontera, se debe utilizar el apropiado equipo de protección resistente al arco. C.1.2.2 Para que una persona traspase la frontera límite de aproximación y entre en el espacio limitado, la persona debería cumplir con los siguientes criterios: (1) Estar cali�cado para desempeñar el trabajo/tarea. (2)) Ser cap (2 apaz az de identi�car los peligros y riesgos asociados con la tarea a realizar realizar.. C.1.2.3 Para cruzar cruzar la frontera restringida de aproximación aproximación y entrar en el espacio restringido, las personas cali�cadas debería cumplir con los siguientes criterios: (1) Tener un un permiso permiso de trabaj trabajoo eléctrico eléctrico energi energizado zado autori autori‐‐ zado por la gerencia. (2) Utili Utilizar zar equip equipoo de protecc protección ión persona personall (EPP) (EPP) con con valor valor de resistencia adecuado para los niveles de tensión y ener‐ gía involucrados. (3) Mini Minimizar mizar la probabi probabilida lidadd de conta contacto cto corpor corporal al con con conductores y partes de circuitos energizados expuestos debido a movimientos involuntarios manteniendo la mayor parte posible del cuerpo fuera del espacio restrin‐
•
Frontera de aproximación restringida
Espacio restringido
FIGURA C.1.2.3 C.1.2.3
Límites de aproximación.
•
C.2 Base para los valores de distancia de las Tablas 130.4(D) (a) y 130.4(D)(b).
Las columnas columnas 2 a 4 de la Tabla Tabla 130.4(D)(a) y la Tabla 130.4(D)(b) muestran varias distancias desde los conductores o partes de circuitos eléctricos energiza‐ dos expuestos. Las mismas incluyen las dimensiones que se deben añadir a las distancias básicas mínimas de aislamiento de aire. Esas distancias básicas mínimas de aislamiento de aire para tensiones de 72.5 kV e inferiores están basadas IEEE 4, Técnicas normalizadas para pruebas de alta tensión, Apéndice 2B; y las tensiones superiores a 72.5 kV están basadas en IEEE 516, C.2.1 Enunciado general.
Guía para métodos de mantenimiento en líneas de corriente eléctrica energizadas. Las distancias básicas mínimas de aislamiento de
aire que se requieren para evitar el arco son como sigue: (1) ≤ 300 300 V: 1 mm mm (0 pies pies 0.03 0.03 pul pulg.) g.) (2) >30 >3000 V a ≤ 750 750 V: 2 mm (0 pies pies 0.07 0.07 pulg. pulg.)) (3) >75 >7500 V a ≤ 2 kV: kV: 5 mm (0 pies pies 0.19 0.19 pulg pulg.) .) (4) >2 kV a ≤ 15 15 kV: 39 mm mm (0 pies 1.5 pulg.) pulg.) (5) >15 kV kV a ≤ 36 kV: kV: 161 mm (0 (0 pies pies 6.3 pulg pulg.) .) (6) >36 kV kV a ≤ 48.3 kV: 254 254 mm (0 pies pies 10.0 10.0 pulg.) pulg.) (7) >48.3 kV a ≤ 72.5 72.5 kV: 381 mm (1 pies 3.0 pulg.) pulg.) (8) >72.5 kV a ≤ 121 kV: 640 640 mm (2 pies pies 1.2 pulg pulg.) .) (9) >138 kV a ≤ 145 kV: kV: 778 778 mm (2 pies pies 6.6 pulg pulg.) .) (10) >161 kV a ≤ 169 kV: kV: 915 915 mm (3 pies pies 0.0 pulg pulg.) .) (11) >230 kV a ≤ 242 kV: kV: 1.281 1.281 m (4 pies pies 2.4 pulg pulg.) .) (12) >345 kV a ≤ 362 kV: kV: 2.282 2.282 m (7 pies pies 5.8 pulg pulg.) .) (13) >500 kV a ≤ 550 550 kV: 3.112 m (10 pies 2.5 2.5 pulg.) pulg.) (14) >765 kV a ≤ 800 800 kV: 4.225 m (13 pies 10.3 10.3 pulg.) pulg.)
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ANEXO INFORMATIVO INFORMATIVO C
Los rangos de tensión se han seleccio‐ nado para agrupar las tensiones que requieren similares distan‐ cias de aproximación basadas en la suma de la distancia de resistencia eléctrica y un factor de movimiento involuntario. El valor del límite superior para un rango es la máxima tensión para la más alta tensión nominal del rango, basado en ANSI C84.1, Sistemas de potencia eléctrica y equipo eléctrico — Valores nomi‐ nales de voltaje (60 Hz). Para sistemas monofásicos, seleccione el rango que es igual a la máxima tensión fase a tierra del sistema multiplicada por 1.732. C.2.1.2 Columna 2. Las distancias distancias en la columna 2 están basa‐ das en la regla de OSHA para personas no cali�cadas que indica mantener una distancia de seguridad de 3.05 m (10 pies) para todas las tensiones hasta 50 kV (tensión a tierra), más 100 mm (4.0 pulg.) por cada 10 kV superior a 50 kV. kV. distancias en la columna columna 3 están basa‐ C.2.1.3 Columna 3. Las distancias das en lo siguiente: (1) ≤750 V: Use la la Tabla Tabla 110.26 110.26(A)(1) (A)(1),, Espacios Espacios de de Trabajo Trabajo,, Condición 2, del Código Eléctrico Nacional (NEC), para el rango de 151 V a 600 V. (2) >750 V a ≤145 ≤145 kV: kV: Use la Tabla 110.3 110.34(A), 4(A), Espaci Espacioo de Trabajo, Condición 2, del Código Eléctrico Nacional (NEC).
C.2
(3) >145 kV: Use Use las regla reglass de OSHA OSHA de de 3.05m 3.05m (10 (10 pies) pies) como se utilizan en la Columna 2. C.2.1.4 Columna 4. Las distancias distancias en la columna 4 están basa‐ das en agregar a las dimensiones de arco mostradas en C.2.1 la siguiente distancia de movimiento involuntario: ≤300 V: Evite el contacto. Basado en la experiencia y las precauciones para sistemas de vivienda de 120/240 V: >300 V a ≤ 750 V: Agregar 304.8 mm (1 pies 0 pulg.) para movimiento involuntario. Durante años de uso en ANSI/IEEE C2, Código Nacional de
C.2.1.1 Columna 1.
Seguridad Eléctrica, se ha encontrado que estos valores son adecuados para las distancias de aproximaci aproximación ón para trabajadores trabajadores de comunica‐ ciones.
>72.5 kV: Agregar 304.8 mm (1 pies 0 pulg.) para movi‐ miento involuntario. Durante años de uso en ANSI/IEEE C2, Código Nacional de Seguridad Eléctrica, se ha encontrado que estos valores son adecuados para las distancias distancias de aproximación aproximación para trabajadore trabajadoress de suministro. suministro. •
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ANEXO INFORMATIVO D
Anexo Informativo Informativo D Métodos de cálculo cálculo de energía energía incidente incidente y frontera frontera de relámpago relámpago de arco arco Este anexo informativo no es parte de los requerimie requerimientos ntos de este docu‐ mento de la NFPA pero se incluye únicamente con �nes informativos. informativos.
[D.2.1(e)]
D.1 Introducción. El Anexo Anexo Informativo Informativo D resume los méto‐
dos de cálculo disponibles para calcular la energía incidente y la frontera de relámpago de arco. Es importante investigar las limitaciones de los métodos que se utilicen. Las limitaciones de los métodos resumidos en el Anexo Informativo D se describen en Tabla D.1 D.2 Método de cálculo cálculo de Ralph Ralph Lee. D.2.1 Ecuaciones básicas para calcular las distancias distancias de la fron‐ tera de relámpago de arco. Los amperios simétricos de corto‐
circuito, Isc, de una falla trifásica sólida en los terminales del transformador se calculan con la siguiente fórmula:
[D.2.1(a)] I sc
= { MVA
Base
× 10 ÷ [1.732 × V ]} × {100 ÷ %Z } 6
donde I sc sc está en amperios, V está está en volts, y %Z se se basa en los MVA del del transformador. Un valor típico para la potencia máxima, P (en MW) en un arco trifásico se puede calcular utilizando la siguiente fórmula: [D.2.1(b)] 2 P = má máxi xima ma fa fall lla a sól sólid ida a en en MVAbf . × 0707
[D.2.1(c)] P
=
1.732 × V
×
I sc
× 10
−6
× 0 .707
2
[D.2.1(d)] Dc = 2.65 × MVAbf × t
2
where:
=
[53 × MVA × t ]
2
distancia en pies (pies) de la persona a la fuente de
D c = arco para justo una quemadura curable (es decir, la
temperatura de la piel se mantiene a menos de 80°C.)
MVA bf bf = Falla sólida MVA en el punto involucrado
MVA nominal del transformador. Para transforma‐ dores con valores nominales menores de 0.75 MVA, MVA = multiplique los MVA nominales del transformador por 1.25. t = tiemp tiempoo de exposición exposición al arco en segundos segundos El tiempo de despeje para un fusible limitador de corriente es aproximadamente ¼ ciclo o 0.004 segundos si la corriente de arco está dentro del rango de la capacidad de limitación de corriente del fusible. El tiempo de despeje de un interruptor de circuito de 5 kV y15 kV es aproximadamente 0.1 segundos o 6 ciclos, si la función instantánea está instalada y operando. Esto se puede desglosar de la siguiente manera: tiempo real del interruptor (aproximadamente 2 ciclos), más el tiempo de operación del relé de aproximadamente 1.74 ciclos, más un margen adicional de seguridad de 2 ciclos, dando un tiempo total de aproximadamente 6 ciclos. Debe agregarse tiempo adicional si hay instalada y operando alguna función de retardo de tiempo. Las fórmulas utilizadas en esta explicación son de Ralph Lee, “El otro riesgo eléctrico: quemaduras por relámpago de arco eléctrico”, Trans. del IEEE sobre aplicaciones industriales,. Los cálculos están basados en el peor caso de impedancia de arco. (Ver Tabla D.2.1.)
La distancia de la frontera de relámpago de arco se calcula de acuerdo con la siguiente fórmula.
1
Dc
1
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[email protected].
ANEXO INFORMATIVO D
Utilizando la Ecuación D.2.1(d), se calcula la distancia de quemadura de segundo grado:
D.2.2 Diagrama uni�lar de un típico complejo petroquímico.
El diagrama uni�lar (ver la Figura D.2.2) ilustra la complejidad de un sistema de distribución en una típica planta petroquí‐ mica. D.2.3 Ejemplo de cálculo. Muchas de las características eléc‐ tricas de los sistemas y equipos se dan en la Tabla D.2.1. El ejemplo de cálculo está hecho sobre barras de 4160 volts en 4A o 4B. La Tabla D.2.1 tabula los resultados del cálculo de la fron‐ tera de relámpago de arco para cada parte del sistema. Estos son los resultados obtenidos de estos cálculos, en base a la Tabla D.2.1: (1) Cá Cálcu lculo lo sobre sobre una una barra barra de 4160 4160 volt volts. s. (2) MVA del del transformador (y MVA base) base) = 10 MVA. (3) Im Imped pedanc ancia ia del del transfor transformad mador or en base base 10 MVA = = 5.5 por ciento. (4) Tiem Tiempo po de despej despejee del inter interrupto ruptorr automáti automático co = 6 cicl ciclos. os. Utilizando la Ecuación D.2.1(a), se calcula la corriente de cortocircuito: I sc
D c =
D c
=
91 MW
6
×
=
[53 × 10 × 0.1]
=
7.28 pies
1
2
La siguiente ecuación se puede utilizar para estimar la energía incidente producida por un arco trifásico abierto en sistemas con valores nominales superiores a 600 V. Los parámetros requeridos para hacer los cálculos son los siguientes: (1) La máxima máxima corri corriente ente de de falla falla de cortoc cortocircu ircuito ito trifásic trifásicoo sólido disponible en el equipo (2) El tiempo tiempo total de despeje despeje del del disposi dispositivo tivo de de protecci protección ón (aguas arriba de la localización del posible arco) a la máxima corriente de cortocircuito. Si el tiempo total de despeje del dispositivo de protección es superior a 2 segundos, considerar cuánto tiempo es probable que una persona permanezca en el lugar del relámpago de arco. Es probable que una persona expuesta a un relámpago de arco se alejará rápidamente si ello es físicamente posi‐ ble, y 2 segundos es un tiempo máximo razonable para el cálculo. Una persona que esté en un camión canastilla o que se ha introducido en un equipo necesitará más tiempo para salir y alejarse. Debe considerarse un sólido criterio de ingeniería en la aplicación del tiempo de despeje máximo de 2 segundos, dado que podría haber circunstancias en las que el egreso de un empleado esté inhibido. (3) La dist distanc ancia ia a la fue fuente nte de arco arco.. (4) Valor nomina nominall de la la tensión tensión fase-a-f fase-a-fase ase del del sistema sistema
Utilizando la Ecuación D.2.1(b), se calcula la potencia del arco: −
½
D.2.4 Cálculo de la exposición a la energía incidente superi‐ ores a 600 V para el análisis de riesgo de relámpago de arco.
= 25, 00 000 0 amperios
1.732 × 4160 × 25,000 × 10
-6
O, utilizando la Ecuación D.2.1(e), se calcula la distancia de quemadura de segundo grado usando el método alternativo:
= {10 × 106 ÷ [1.732 × 4160 ]} × {100 ÷ 5.5}
=
{2.65 ×[1.732 × 25,000 × 4160 × 10 ]× 0.1}
= 6.9 ó 7.00 pies
106 ÷ [1.732 × V ]} × {100 ÷ %Ζ } = {MVA Base × 10
P
D.2
0 .707 2
Tabla D.2.1 Peligro de quemadura por relámpago de arco en varios niveles en una planta petroquímica grande (1)
(2)
(3)
(4) Sistema o
(5)
(6)
(7)
Tiempo de
Distancia típica de frontera de relámpago de arco*
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[email protected].
ANEXO INFORMATIVO INFORMATIVO D
D.3
16001
16002
q
230kV/13.8kV
Empresa de energ’a Potencia de fallas 9000MVA
q
230kV/13.8kV
13.8kV Bus 1A
13.8kV Bus 1B
13.8kV Bus 1A/1 600A
13.8kV Bus 1B/1 600A 5MVA
5MVA
5.5%
5.5%
Bus 2A 1TI Bus 2B 4.16kV 2.5MVA 2.5MVA
5.5% Bus 3A
5.5% Bus 3B
600V 2.5MVA 2.5MVA
5.5% Bus 5A
1.5MVA 5.5% 600V Bus 10B
1MVA 5.57%
600V Bus 11B
5.5% Bus 5B
600V 2.5MVA 2.5MVA
5.5% Bus 6A
5.5% Bus 6B
600V 2.5MVA 2.5MVA
5.5% Bus 7A
5.5% Bus 7B
600V 10MVA 10MVA
5.5% Bus 4A
5.5% Bus 4B
4.16kV
FIGURA D.2.2
Diagrama uni�lar de un típico complejo petroquímico
las situaciones. Es esencial que las ecuaciones se utilicen sólo
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
ANEXO INFORMATIVO INFORMATIVO D
sobrecorriente puede requerir segundos o minutos para abrir.) (2) El tiempo tiempo total de despeje despeje del del disposi dispositivo tivo de de protecci protección ón (aguas arriba de la localización del posible arco) a la máxima corriente de cortocircuito y al mínimo nivel de falla en el cual el arco se sostendrá. (3) La distanc distancia ia del trabaj trabajador ador al al arco arco potencial potencial para la la tarea que se va a realizar. Las distancias de trabajo típicas, utilizadas para los cálculos de energía incidente son las siguientes: (1) Voltaje bajo(6 bajo(600 00 V y menor) menor) CCM CCM y paneles paneles de de distribu distribu‐‐ ción — 455 mm (18 pulg.). (2) Voltaje bajo (600 (600 V y menor) menor) tablero tablero de potenci potenciaa — 610 mm (24 pulg.). (3) Voltaje medi medioo (arriba (arriba de de 600 V) tablero tablero de potenc potencia ia — 910 mm (36 pulg.). D.3.2 Arco al aire libre (arco abierto). La energía incidente estimada para un arco abierto es:
D.4
[D.3.3(a)] 0.0093 F −0.3453 F +5.9675 2
E MB
= 1038.7 D
−1.4738
t A
B
where: máxima energía incidente en caja cúbica de 20 pulg., E MB MB = cal/cm² D B = distancia a los electrodos de arco, en pulgadas (pulg.) (para distancias de 18 pulg. y mayores) t A = del arco (segun (segundos) dos) A corriente de cortocircuito, kA (para el rango de 16 kA a F = 50 kA) Ejemplo de cálculo: Utilizando Utilizando la Ecuación D.3.3(a), se calcula la máxima energía incidente en caja cúbica de 20 pulg., cal/ cm², utilizando lo siguiente: (1) D A A = 18 pulg. (2) t A A = 0.2 segundos (3) F = = 20 kA
[D.3.2(a)] 0.0016 F −0.0076 F +0.8938 2
E MA
= 5271D
−1.9593 A
t A
[D.3.3(b)]
E MB
where: 2 E MA MA = máxima energía incidente del arco abierto, cal/cm D A = distancia a los electrodos de arco, en pulgadas (para distancias de 18 pulg. y mayores) t A = duración durac ión del arco arco (segundos) (segundos) A corriente de cortocircuito, kA (para el rango de 16 a 50 F = kA)
E MA
A
A
Las ecuaciones ecuaciones para para esta sección fueron fueron derivadas en el trabajo de IEEE escrito por R. L. Doughty, Thomas E. Neal y H. L. Floyd, II, “Predicción de la energía inci‐ dente para un mejor manejo del riesgo de arco eléctrico en sistemas de distribución de energía de 600 V”. D.3.4 Referencia.
la máxima energía incidente de arco abierto, cal/cm², donde
0.0016 F 2 − 0.0076F t = 5271 D +0.8938 = 5271 × .0035× 3 5× 0.2 0.2 [0.00 0.0016× 16× 400 400 − 0.00 0.0076× 76× 20+ 0.89 0.8938 38 ]
t A
= 34.1 J/cm2 ( 8.144 cal/cm2 )
D A = 20 kA. A = 18 pulg., t A A = 0.2 segundos y F =
−1.9593
−1.4738
B
928 × [2.7815 7815] = 2.928
Ejemplo de cálculo: Utilizando Utilizando la ecuación D.3.2(a), se calcula
[D.3.2(b)]
0.0093 F − 0.3453F +5.9675 0.0093× 93× 400 400 − 0.3453× 0.3453× 20 0.00 =1038×0.0141×0.2 0141×0.2 +5.9675 = 1038.7 D
2
•
D.4 Método de cálculo cálculo de IEEE 1584. D.4.1 Ecuaciones básicas para el cálculo de la energía inci‐ dente y la frontera de relámpago de arco. Esta sección provee extractos de IEEE1584, Guía para efectuar el cálculo del riesgo de
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[email protected].
ANEXO INFORMATIVO INFORMATIVO D
D.4
D.4.1.1 Límites del sistema. Se puede obtener empíricamente
una ecuación para calcular energía incidente utilizando análi‐ sis estadístico de datos generales junto con un algoritmo de ajuste de curvas. Puede utilizarse para sistemas con los siguientes límites: (1) 0.2 0.208 08 kV a 15 15 kV kV, trifá trifásic sicoo (2) 50 Hz a 60 Hz (3) 700 A a 106,000 106,000 A de corrie corriente nte de cortoc cortocircui ircuito to disponi‐ disponi‐ ble (4) 13 mm mm a 152 mm de de distanci distanciaa entre entre conduc conductores tores Se encuentra disponible un modelo derivado teóricamente para sistemas trifásicos en subestaciones al aire libre, sistemas de transmisión al aire libre y sistemas de distribución. El modelo obtenido teóricamente tiene el propósito de utilizarse en aplicaciones donde las fallas llegan a ser trifásicas. Donde no es posible o factible que las fallas lleguen a ser trifásicas o donde se encuentran sistemas monofásicos, esta ecuación probablemente dará resultados conservadores. D.4.2 Corriente de arqueo. Para determinar el tiempo de operación de los dispositivos de protección, buscar la corriente de arco trifásico estimada. Para aplicaciones con tensión nominal por debajo de 1 kV, resolver la Ecuación D.4.2(a):
utilizando los dos valores (I a a y 0.85 I a a ) y utilice el valor más alto. D.4.3 Energía incidente a la distancia de trabajo—Ecuación la energía energía incidente obtenida empíricamente. Para obtener la
utilizando la ecuación obtenida empíricamente, obtenga el log10 de la energía incidente normalizada. Esta ecuación se basa en datos normalizados de tiempo de arco de 0.2 segundos y a una distancia del posible punto de arco a la persona de 610 mm: [D.4.3(a)] lg E n
=
k1
+
k 2
+
1.081 lg I a + 0.0011G
where: energía incidente (J/cm2) normalizada para tiempo y E n n = distancia −0.792 para arcos al aire libre; −0.555 para arcos en una k 1 = caja 0 para sistemas no puestos a tierra puesto a tierra k 2 = mediante alta resistencia = −0.11 −0.1133 para sistemas sistemas puestos puestos a tierra la separación del conductor (mm) (Consultar la Tabla G = D.4.2 .) Entonces,
[D.4.2(a)] lg I a
=
K
+
0.662 lg I bf + 0.0966V
+ 0.00 0005 0526 26G −
+
0 .55 5588 88V ( lg I bf )
0.00304 304G ( lg I bf )
[D.4.3(b)]
E n
=
10
lg E n
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
ANEXO INFORMATIVO INFORMATIVO D
Convirtiendo de lo normalizado: [D.4.3(c)] E
= 4.184C f
t 610 D x 0.2 x
E n
where: E = energía incidente en J/cm2 C f = fac factor tor de cálcu cálculo lo = 1.0 para tension tensiones es superiores superiores a 1 kV = 1.5 para tensiones tensiones iguales o menores que 1 kV E n energía ía incidente incidente normaliza normalizada da n = energ t = tiemp tiempoo de arco arco (segundos (segundos)) X = el exponente de la distancia distancia de la Tabla Tabla D.4.2 D = distancia (mm) del arco a la persona (distancia de trabajo). Ver Tabla D.4.3 para para distancias típicas. Si el tiempo de formación del arco, t, en la ecuación del punto D.4.3(c) es superior a 2 segundos, considerar cuánto tiempo es probable que una persona permanezca en el lugar del relámpago de arco. Es probable que una persona expuesta a un relámpago de arco se alejará rápidamente si ello es física‐ mente posible, y 2 segundos es un tiempo máximo razonable para el cálculo. Debe considerarse un sólido criterio de inge‐ niería en la aplicación del tiempo de despeje máximo de 2 segundos, dado que podría haber circunstancias en las que el egreso de un empleado esté inhibido. Por ejemplo, una persona que esté en un camión canastilla o que se ha introdu‐ cido en un equipo necesitará más tiempo para salir y alejarse. D.4.4 Energía incidente a la distancia de trabajo—Ecuación teórica. La ecuación ecuación obtenida teóricamente se puede aplicar aplicar
D.4
Para tensiones mayores a 15 kV, la corriente de falla de arco y la corriente de falla sólida se consideran iguales. iguales. D.4.5 Frontera de relámpago de arco. La frontera de relám‐ pago de arco es la distancia a la cual es probable que una persona reciba una quemadura de segundo grado. El inicio de una quemadura de segundo grado se asume que es cuando la piel recibe una energía incidente de 5.0 J/cm². Para la ecuación obtenida empíricamente, [D.4.5(a)] 1
DB
t 610x x 184C f E n = 4. 184 E 0.2 B
Para la ecuación obtenida teóricamente, [D.4.5(b)] DB
=
2.14 2
t × 1 0 VI bf E B 6
where: D B B = La distancia (mm) de la frontera de relámpago de arco al punto de arqueo. C f = Factor de cálcu cálculo. lo. = 1.0 para tensiones tensiones superiores a 1 kV. kV. = 1.5 para tensiones iguales iguales o menores que 1 kV kV.. E n Energía ía incidente incidente normalizada. normalizada. n = Energ t = Tiemp Tiempoo (segun (segundos). dos).
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Copyright 2018 National Fire Protection Association (NFPA®). Licensed, by agreement, for individual use and download on 01/26/2018 to Jr Montajes for designated user Jairo Ricardo. No other reproduction or transmission in any form permitted without written permission of NFPA®. For inquiries or to report unauthorized use, contact
[email protected].
ANEXO INFORMATIVO D
D.4
Donde 22.6 kA ≤Ibf ≤65.9 kA,
(D) Fusibles Clase L 601 A hasta 800 A. Donde I bf bf <15.7 kA, [D.4.6(a)]
E
=
4.184
(
−0 .1284 bf + 32 .262
I
)
Donde 65.9 kA < I bf bf ≤106 kA,
calcular la corriente de arco utilizando la Ecuación D.4.2(a), y utilizar curvas tiempo-corriente para determinar la energía inci in cide dent ntee uti utili liza zand ndoo la lass Ecu Ecuac acio ione ness D. D.4. 4.3( 3(a) a),, D. D.4. 4.3( 3(b) b),, y D.4.3(c). Donde 15.7 kA ≤I bf bf ≤44.1 kA, [D.4.6(j)]
[D.4.6(b)] E
=
4.184
(
−0 .5177 bf + 57 .917
I
E
)
Donde I bf bf >106 kA, contactar al fabricante. (B) Fusibles Clase L 1201 A hasta 1600 A. Donde I bf bf <15.7 kA, calcular la corriente de arco utilizando la Ecuación D.4.2(a), y utilizar curvas tiempo-corriente para obtener la energía inci‐ dente utilizando las Ecuaciones D.4.3(a), D.4.3(b) y D.4.3(c). Donde 15.7 kA ≤I bf bf ≤31.8 kA, [D.4.6(c)] E
=
4.184
(
−0 .1863 bf + 27 .926
I
)
Donde 44.1 kA≤ I bf bf ≤65.9 kA,
=
4.184
=
12.3 J/cm2 (2.94 cal/cm2 )
Donde 65.9 kA
−0 .0601 bf + 2 .8992
I
)
Donde 44.1 kA < I bf ≤106 kA, [D.4.6(k)] E
=
1.046
Donde I bf bf > 106 kA, contactar al fabricante. (E) Fusibles Clase RK1 401 A hasta 600 A. Donde <8.5 kA,
calcular la corriente de arco utilizando la Ecuación D.4.2(a) y utilizar curvas tiempo-corriente para determinar la energía inc ncid iden ente te uti tili liza zand ndoo la lass Ec Ecuuac aciion ones es D.4 .4.3 .3(a (a), ), D.4 .4.3 .3(b (b)) y D.4.3(c). Donde 8.5 kA ≤I bf bf ≤14 kA, [D.4.6(l)]
[D.4.6(e)] E
(
E
=
4.184
(
−3.0545 bf + 43 .364
Donde 14 kA < I bf ≤15.7 kA,
I
)
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[email protected].
ANEXO INFORMATIVO D
Donde 5.04 kA < I bf bf ≤ 22.6 kA,
=
4.184
(
−0 .0302 bf + 0 .9321
I
)
Donde 22.6 kA
=
1.046
Donde I bf bf >106 kA, contacte al fabricante. (G) Fusibles Clase RK1 101 A hasta 200 200 A. Donde I bf bf <1.16 kA, calcular la corriente de arco utilizando la Ecuación D.4.2(a), y utilizar curvas tiempo-corriente para determinar la energía inccid in iden ente te uti tili liza zand ndoo la lass Ecu cuac aciion ones es D.4 .4.3 .3(a (a), ), D.4 .4.3 .3(b (b)) y D.4.3(c). Donde 1.16 kA ≤ I bf bf ≤ 1.6 kA, [D.4.6(s)] E
=
4.184
(
−18 .409 bf + 36 .355
I
)
Donde 1.6 kA < I bf bf ≤ 3.16 kA, [D.4.6(t)] E
=
4.184
(
Las ecua‐ ciones especi�cadas en la Tabla D.4.7 pueden ser aplicadas para sistemas con interruptores automáticos de baja tensión. Los resultados de las ecuaciones determinarán la energía inci‐ dente y la frontera de protección contra relámpago de arco cuando la I bf bf está dentro del rango, según se ha descripto. Las curvas tiempo-corriente para el interruptor automático no son necesarias dentro del rango correspondiente. El rango de corrientes trifásicas de falla franca disponibles se encuentra entre 700 A y 106,000 A. Cada una de las ecuaciones es aplicable para el siguiente rango: D.4.7 Interruptores automáticos de baja tensión.
[D.4.6(q)] E
D.4
−4.2628 bf + 13 .721
I
)
I1
<
I bf
<
I 2
where: I 1 = mínima corriente de cortocircuito trifásico sólido disponi‐ ble a la que se puede aplicar este método. I 1 es el nivel más bajo de corriente posible de cortocircuito trifásico sólido que produce su�ciente corriente de arco para que se produzca el disparo instantáneo o para que haga que se produzca el disparo de corta duración en los interrup‐ tores automáticos sin disparo instantáneo. I 2 = es el valor nominal de interrupción del CB a la tensión de interés. Para encontrar I 1, se debe encontrar el disparo instantáneo (I t t ) del interruptor automático. Este se puede obtener de la curva tiempo-corriente o se puede asumir que es 10 veces el valor nominal del interruptor automático para interruptores automáticos con valores nominales superiores a 100 amperios. Para interruptores automáticos con valores nominales de 100 amperios y menos, se puede utilizar un valor de I t t = 1,300 A.
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ANEXO INFORMATIVO INFORMATIVO D
D.4
Tabla D.4.7 D.4.7 Energía incidente y frontera de relámpago de arco arco por tipo de interruptor y capacidad 480 V y menor Capacidad (A)
100–400 600–1200 600–1200 1600–6000 800–6300 800–6300
Tipo de interruptor
MCCB MCCB MCCB MCCB o ICCB LVPCB LVPCB
Tipo de unidad de disparo
Energía Incidente (J/cm2)a
TM o M TM o M E, LI TM o E, LI
0.189 I bf bf 0.223 I bf bf 0.377 I bf 0.448 I bf
E, LI E, LS b
Frontera de relámpago de arco (mm)a
575–600 V Energía Incidente (J/cm2)a
Frontera de relámpago de arco (mm)a
+ 0.548 + 1.590 + 1.360 + 3.000
9.16 I bf bf + 194 8.45 I bf bf + 364 12.50 I bf + 428 11.10 I bf + 696
0.271 I bf bf 0.335 I bf bf 0.468 I bf 0.686 I bf
+ 0.180 + 0.380 + 4.600 + 0.165
11.8 I bf bf + 196 11.4 I bf bf + 369 14.3 I bf + 568 16.7 I bf + 606
0.636 I bf bf + 3.670 4.560 I bf bf + 27.230
14.50 I bf bf + 786 47.20 I bf bf + 2660
0.958 I bf bf + 0.292 6.860 I bf bf + 2.170
19.1 I bf bf + 864 62.4 I bf bf + 2930
MCCB: Interruptor de circuito de caja moldeada. ICCB: Interruptor de circuito de caja aislada. LVPC: Interruptor de circuito de potencia de bajo voltaje. TM: Unidades de disparo termo-magnéticas. M: Unidades de disparo magnéticas (solo instantáneas). E: Las unidades de disparo electrónicas tienen tres características que pueden ser utilizadas separadas o combinadas: L: Tiempo-Largo, S: TiempoCorto, I: Instantáneo. a I bf es en kA; distancia de trabajo es 455 mm (18 pulg.). b Se asume que el retraso de tiempo-corto está puesto al máximo.
incluida la la hoja de D.4.8 Referencias. Los datos completos, incluida cálculo para resolver las ecuaciones, se pueden encontrar en IEEE 1584, Guía para efectuar el cálculo del riesgo de relámpago de arco. Las publicaciones IEEE se pueden comprar en el Instituto de Ingenieros Eléctricos y Electrónicos, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331, USA. (http://stand‐ ards.ieee.org/).
D.5.2 Método detallado de cálculo cálculo de la energía y la corriente de formación de arcos. En Transacciones de Aplicaciones Indus‐ triales del IEEE se se publicó una minuciosa revisión teórica de la
corriente de formación de arcos de corriente directa y la ener‐ gía. Se aconseja a los lectores consultar dicho artículo (ver refer‐ encia 1) para para conocer los cálculos detallados. Referencias:
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ANEXO INFORMATIVO INFORMATIVO E
E.3
Anexo Informativo Informativo E Programa de de seguridad eléctrica Este anexo informativo no es parte de los requerimi requerimientos entos de este docu‐ mento de la NFPA pero se incluye únicamente con �nes informativos. informativos. (Ver 110.1, Programa de Seguridad Eléctrica.)
E.1 Principios de un típico programa de seguridad eléctrica.
Los principios del programa de seguridad eléctrica incluyen, pero no están limitados a los siguientes: (1) Inspe Inspeccion ccionar ar y evalu evaluar ar los equip equipos os eléctric eléctricos. os. (2) Mante Mantener ner la integ integrida ridadd del aislam aislamiento iento de de los equipos equipos eléctricos y del envolvente. (3) Plani�car cada uno de los trabajos y documentar de los procedimientos que se realizan por primera vez. (4) Des Desene energi rgizar zar,, si es posi posible ble (ver 120.1). (5) Ant Antici icipar par a even eventos tos no no espera esperados dos.. (6) Identi�car los peligros eléctricos y reducir los riesgos
(4) Todos los los conductor conductores es o partes partes de circui circuitos tos eléctrico eléctricoss se consideran energizados hasta que se demuestre lo contra‐ rio. (5) Desen Desenergiz ergizar ar un condu conductor ctor eléctr eléctrico ico o pieza pieza de de circuito circuito y volverlos seguros para trabajar sobre ellos es, en sí misma, una tarea potencialmente peligrosa. (6) Las tare tareas as que que se van van a lleva llevarr a cabo cabo en o cerc cercaa de conductores eléctricos y partes de circuitos energizados expuestos tienen que ser identi�cadas y categorizadas. (7) Se determi determinan nan y emple emplean an precauc precauciones iones aprop apropiada iadass para para el entorno de trabajo. (8) Se aplica aplica un enfoque enfoque lógic lógicoo para para determi determinar nar el el riesgo riesgo potencial asociado a cada tarea. E.3 Procedimientos típicos de un programa programa de seguridad eléc‐ trica. Los procedimientos procedimientos de un programa de de seguridad eléc‐
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ANEXO INFORMATIVO INFORMATIVO F
Anexo Informativo Informativo F Procedimie Procedimiento nto de evaluación evaluación de riesgos Este anexo informativo no es parte de los requerimie requerimientos ntos de este docu‐ mento de la NFPA pero se incluye únicamente con �nes informativos. informativos.
Gestión de seguridad
Identificación del riesgo
F.1 Evaluación de riesgos (general). El presente anexo infor‐
Iteración
Riesgo inicial estimado
mativo proporciona orientación sobre un enfoque cualitativo de la evaluación de los riesgos, incluyendo la estimación y la evaluación de los mismos, útil para determinar las medidas de protección que sean requeridas para reducir la probabilidad de heridas o daños a la salud que podrían ocurrir en las circuns‐ tancias consideradas. Para obtener el total bene�cio de la compleción del proceso de evaluación de riesgos, deben comprenderse las relaciones que existen entre la fuente o causa del riesgo y los efectos de la jerarquía de controles que se aplica sobre dichas causas. El propósito de este anexo informa‐ tivo es facilitar los principios orientativos.
Control de diseño
Ingeniería de diseño
Artículo 100, Secciones 110.1(G), 130.3 Sección 130.4, 130.5
Diseño inherentemente seguro (eliminación o sustitución)
NFPA 70, Código Elec- trico Nacional, Tablas Nacional, Tablas 130.7(C)(15)(A)(a) 130.7(C)(15)(A)(b) 130.7(C)(15)(B)
Riesgo residual estimado
Anexo Informativo F
Dispositivos protectores
Sección 130.7(D)
Información para su uso
Sección 120.2(F)(1), 205.3, 225.3, 340.7(A)(6)
Riesgo residual estimado
Anexo Informativo F
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ANEXO INFORMATIVO F Proceso de evaluación de riesgo Nota: los textos en cursiva representan información usada durante el proceso de evaluación de riesgo.
Evaluación de riesgo
Identificación del sistema eléctrico, notas
Versión de evaluación
Detalles de la versión de la evaluación
Documentos relacionados: Ficha técnica, diagrama unifilar, unifilar, estudio de coordinación, documentos de entrenamiento, instrucciones del trabajo, políticas y procedimientos, miembros del equipo, fecha de evaluación, presunciones, etc.
Información general para cada zona de riesgo • Descripción de la zona de riesgo • Actividades previstas • Evento(s) peligroso(s) • Situación(es) peligrosa(s) Estimación del riesgo
Probabilidad de que ocurra un evento peligroso
Peligro
Severidad de lesión potencial
Dudas, notas Imágenes
Análisis del peligro
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F.2
ANEXO INFORMATIVO INFORMATIVO F
F.2 Evaluación de riesgos.
Se debería llevar a cabo una estimación inicial del riesgo para cada uno de los peligros. El riesgo relacionado con el peligro identi�cado debería deri‐ varse de la aplicación de los parámetros de riesgo que se mues‐ tran en la Figura F.2.1, incluidos los siguientes: (1) Sever Severidad idad de las las herida heridass o daños daños a la salud (Se) (2) Proba Probabilid bilidad ad de que dichas dichas herid heridas as o daños daños a la salud salud ocurran, siendo esta una consecuencia de todo lo siguiente: a. Frecu Frecuencia encia y duración duración de la expos exposición ición de las personas al riesgo (Fr) b. Proba Probabilid bilidad ad de ocurren ocurrencia cia de un un evento peligr peligroso oso (Pr) c. Posib Posibilid ilidad ad de evitar evitar o limita limitarr las herid heridas as o daños daños a la salud (Av) F.2.2 Parámetros aplicados aplicados en la estimación del riesgo. Como preparación para la evaluación de riesgo, se calculan los pará‐ F.2.1 Estimación inicial del riesgo.
Tabla F.2.3 Clasi�cación de la severidad de las posibles heridas o daños a la salud (Se). Seve Se veri rida dad d de las he heri rida dass o da daño ñoss a la sa sallud
Irreversible — traumatismos, muerte Permanente — daños óseos, ceguera, pérdida de la audición, quemaduras de tercer grado Reversible — impactos menores, daños en la audición, quemaduras de segundo grado Reversible — laceraciones menores, contusiones, quemaduras de primer grado
Val alor or Se
8 6 3 1
F.2.4 Probabilidad de ocurrencia de heridas o daños a la salud.
Cada uno de los tres parámetros de probabilidad de ocurrencia de heridas o daños a la salud (es decir, Fr, Pr y Av) deberían
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ANEXO INFORMATIVO INFORMATIVO F F.2.4.2 Probabilidad de ocurrencia de un evento peligroso (Pr). La ocurrencia ocurrencia de un un evento peligroso peligroso afecta la probabili‐
dad de ocurrencia de heridas o daños a la salud. La posibilidad de que ocurra un evento peligroso debería describir la posibili‐ dad de que el evento se materialice durante el uso, o durante el uso indebido previsible, o ambos, del proceso o sistema eléc‐ trico. La subjetividad puede tener un impacto sustancial en el resultado de la evaluación de riesgo. El uso de información subjetiva debería minimizarse tanto como sea razonablemente posible. La probabilidad de ocurrencia de un evento peligroso debe‐ ría estimarse de manera independiente de otros parámetros relacionados (Fr y Av) y normalmente estará basada en los resultados del estudio previamente completado del potencial de relámpago de arco. Debería aplicarse el escenario de peor caso posible para este parámetro, para asegurar que el/los dispositivo(s) de interrupción de cortocircuitos hayan sido, siempre que sea posible, apropiadamente seleccionados e insta‐ lados y que brindarán una protección su�ciente.
F.2
El comportamiento humano estará in�uenciado por factores tales como habilidades, entrenamiento, experiencia y compleji‐ dad de la máquina o el proceso. Por lo general, estos atributos no están directamente bajo la in�uencia del diseñador del sistema eléctrico, pero un análisis de las tareas revelará actividades en las que no puede razona‐ blemente suponerse el total conocimiento de todos los aspec‐ tos incluidos los resultados inesperados. Debería seleccionarse la probabilidad de ocurrencia de un evento peligroso “muy alta” para re�ejar las restricciones normales del lugar de trabajo y las consideraciones del peor caso posible. Se requie‐ ren razones positivas (por ejemplo, una aplicación bien de�‐ nida y un alto nivel de competencia del usuario) para la aplicación de cualquier valor inferior. Todas las habilidades, conocimientos, etc. requeridos o asumidos deberían estar establecidos en la información de uso. Seleccionar la hilera apropiada de probabilidad de ocurren‐ cia de un evento peligroso (Pr) de la Tabla F.2.4.2. F.2.4.2.
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F.2
ANEXO INFORMATIVO INFORMATIVO F
Seleccionar la �la apropiada correspondiente a la probabili‐ dad de evitar o limitar las heridas o daños a la salud (Av) de la Tabla F.2.4.3. Insertar el valor apropiado para el nivel de riesgo bajo la columna Av en la Tabla F.2.5. F.2.5 Nivel de riesgo y probabilidad de heridas o daños a la
F.3.1.1 Controles de ingeniería. Los controles de ingeniería
pueden impactar sustancialmente sobre el riesgo. Deberían ser considerados y analizados, siempre que sea factible. General‐ mente, los controles de ingeniería adoptan la forma de barre‐ ras y otros dispositivos de salvaguarda, según se describen en NFPA 70, Código Eléctrico Nacional, IEC 60204-1 ed. 5.1 Consol. con am 1, Seguridad de las maquinarias — Equipos eléctricos de
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ANEXO INFORMATIVO F F.4 Evaluación de riesgos. riesgos. F.4.1 Evaluación de riesgos. Una vez que las medidas protec‐
toras apropiadas que se describen en el punto F.3.1 han sido aplicadas, debería tomarse en cuenta el efecto de dichas medi‐ das en los elementos de riesgo (ver Figura F.2.1). Cada tipo de medida protectora podría tener impacto en uno o más de los
F.4
Ejemplos de modalidad(es) de falla: (1) Dem Demasi asiada adass señale señaless de adve adverte rtenci ncia. a. (2) Depre Depreciac ciación ión del del efecto efecto con con el trans transcurs cursoo del tiemp tiempo. o. (3)) Fa (3 Falt ltaa de de com compr pren ensi sión ón.. F.4.1.4 Organización y aplicación de un sistema de trabajo seguro.
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ANEXO INFORMATIVO F
F.4
Peligro (situación)
Estrategia de reducción del riesgo
Factores humanos
Entrenamiento Entrenamien to e instrucciones que incluyen detalles relacionados
Confirmación (en sitio) Sí/ No
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ANEXO INFORMATIVO INFORMATIVO G
5.0
Anexo Informativo Informativo G Ejemplo del procedimie procedimiento nto bloqueo/etiqueta bloqueo/etiqueta Este anexo informativo no es parte de los requerimi requerimientos entos de este docu‐ mento de la NFPA pero se incluye únicamente con �nes informativos. informativos.
3.3 Revisar otras actividades actividades de trabajo para identi�car dónde y cómo otras personas pueden estar expuestas a peligros eléc‐ tricos. Revisar otras fuentes de energía en el área física para
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5.8
ANEXO INFORMATIVO INFORMATIVO G
Veri�que Ve ri�que que el instrumento opera correctamente después de probar la ausencia de tensión 5.9 Donde se requiera, requiera, instale dispositivos dispositivos de puesta a tierra tierra de equipos/conductores en los conductores de fase o partes de circuitos, para eliminar tensión inducida o energía almace‐ nada, antes de tocarlos. Donde se haya determinado que es
5.8
(7) Secuencia Secuenciass de conmu conmutació tación n compleja complejass o partic particular ulares. es. (8) El bloque bloqueo/etiq o/etiquetad uetadoo se prolo prolonga nga duran durante te más más de un turno, o sea, con nuevos trabajadores. procedimientos del candado/etiqueta complejo complejo 9.1 Todos los procedimientos deben requerir un plan de ejecución por escrito. El plan debe incluir los requisitos establecidos en los puntos 1.0 a 3.0, 5.0,
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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The world's largest digital library
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