{"id":2547,"date":"2012-02-26T11:00:39","date_gmt":"2012-02-26T18:00:39","guid":{"rendered":"https:\/\/brainfiller.com\/?p=2547"},"modified":"2025-11-21T14:24:53","modified_gmt":"2025-11-21T21:24:53","slug":"arc-flash-hazard-calculations-studies","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/brainfiller-library\/arc-flash-hazard-calculations-studies\/","title":{"rendered":"Estudios de c\u00e1lculo de riesgo de arco el\u00e9ctrico"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"2547\" class=\"elementor elementor-2547\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ee9d843 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ee9d843\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-94aaab5\" data-id=\"94aaab5\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-48a73ac elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"48a73ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-56676e24 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"56676e24\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-52722f84\" data-id=\"52722f84\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-37528284 elementor-widget elementor-widget-text-editor\" data-id=\"37528284\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>En los primeros a\u00f1os de la NFPA 70E y la aparici\u00f3n de los requisitos de protecci\u00f3n contra arcos el\u00e9ctricos, muchas personas utilizaban las Tablas de peligros y riesgos de la NFPA 70E para determinar qu\u00e9 EPP con clasificaci\u00f3n de arco el\u00e9ctrico utilizar. Este enfoque contin\u00faa cambiando hacia el uso de estudios de arcos el\u00e9ctricos que involucran c\u00e1lculos de energ\u00eda incidente y l\u00edmites de arcos el\u00e9ctricos basados en la norma IEEE 1584.<\/p><h2><strong>La tendencia<\/strong><\/h2><p>Parece que m\u00e1s empresas que nunca est\u00e1n realizando estudios de c\u00e1lculo de riesgo de arco el\u00e9ctrico (AFHCS). Uno de los mayores atractivos es que los resultados del estudio proporcionan pr\u00e1cticamente todo lo que necesita para cumplir con muchos de los requisitos de la NFPA 70E. Los c\u00e1lculos de energ\u00eda del incidente y de los l\u00edmites de arco el\u00e9ctrico, las clasificaciones de la ropa y el equipo de protecci\u00f3n, las etiquetas de advertencia de arco el\u00e9ctrico, las recomendaciones para reducir el riesgo e incluso un diagrama unifilar actualizado se pueden proporcionar como parte del estudio. Con una lista como esta, es posible que se pregunte &quot;\u00bfQu\u00e9 estamos esperando? \u00bfC\u00f3mo empiezo?&quot;. El libro <a href=\"https:\/\/brainfiller.com\/es\/producto\/complete-guide-to-arc-flash-hazard-calculation-studies\/\">\u201cGu\u00eda completa para estudios de c\u00e1lculo de arcos el\u00e9ctricos\u201d<\/a> que escrib\u00ed, proporciona un enfoque paso a paso que se resume en este art\u00edculo.<\/p><h2><strong>Recopilaci\u00f3n y modelado de datos<\/strong><\/h2><p>El mayor esfuerzo consiste en reunir todos los datos necesarios. Informaci\u00f3n como el tipo de equipo, los conductores, la conexi\u00f3n a tierra, la distancia de trabajo, los dispositivos de protecci\u00f3n, los datos de la empresa de servicios p\u00fablicos y m\u00e1s forman parte del proceso. La recopilaci\u00f3n de datos a menudo puede representar m\u00e1s de la mitad de todo el esfuerzo del estudio.<\/p><p>Con los datos en la mano, el siguiente paso es crear un modelo o \u201cmapa de ruta\u201d del sistema el\u00e9ctrico. Existen muchos programas inform\u00e1ticos que pueden simplificar este proceso organizando los datos y realizando una serie de c\u00e1lculos complejos basados en la norma IEEE 1584 (Gu\u00eda IEEE para c\u00e1lculos de peligros de arco el\u00e9ctrico).<\/p><p>Adem\u00e1s de realizar el estudio en funci\u00f3n de las condiciones normales de funcionamiento, tambi\u00e9n puede ser necesario evaluar escenarios alternativos, como que el lazo est\u00e9 abierto o cerrado. Estos escenarios adicionales a veces pueden producir resultados peores que el caso normal.<\/p><h3><strong>C\u00e1lculos de cortocircuito<\/strong><\/h3><p>Los c\u00e1lculos de cortocircuito son el siguiente paso. La corriente de cortocircuito tradicional \u201catornillada\u201d se determina para cada ubicaci\u00f3n y luego se utiliza para calcular la corriente de cortocircuito de arco. La condici\u00f3n \u201catornillada\u201d supone que hay una conexi\u00f3n s\u00f3lida en el punto de la falla sin impedancia adicional. Sin embargo, durante un arco el\u00e9ctrico, el arco crea una impedancia adicional que har\u00e1 que la corriente de cortocircuito de \u201carco\u201d sea menor que la corriente atornillada.<\/p><h2><strong>Curvas de duraci\u00f3n y tiempo de corriente del arco el\u00e9ctrico<\/strong><\/h2><p>La gravedad de un arco el\u00e9ctrico no solo est\u00e1 relacionada con la corriente de cortocircuito, sino que tambi\u00e9n depende de su duraci\u00f3n. Las curvas de tiempo-corriente se utilizan normalmente para evaluar cu\u00e1nto tarda un dispositivo de protecci\u00f3n anterior en funcionar y eliminar el arco el\u00e9ctrico. Estas curvas son representaciones gr\u00e1ficas de c\u00f3mo responde el dispositivo para una cantidad determinada de corriente.<\/p><p>Si una curva de tiempo-corriente indica que el dispositivo puede tardar mucho tiempo en funcionar, generalmente debido a una corriente de cortocircuito muy baja, la norma IEEE 1584 sugiere limitar el tiempo m\u00e1ximo a dos segundos. Esto supone que una persona reaccionar\u00e1 y saltar\u00e1 para apartarse siempre que existan las condiciones adecuadas.<\/p><h2><strong>C\u00e1lculos de energ\u00eda incidente<\/strong><\/h2><p>El componente m\u00e1s importante del estudio son los c\u00e1lculos de energ\u00eda incidente, que se basan en la corriente de cortocircuito del arco y la duraci\u00f3n del arco el\u00e9ctrico. Estos c\u00e1lculos se utilizan para predecir la energ\u00eda incidente potencial que podr\u00eda alcanzar a un trabajador a una distancia espec\u00edfica del arco, conocida como distancia de trabajo. Se debe tener precauci\u00f3n porque si alguna parte de la persona est\u00e1 m\u00e1s cerca que la distancia de trabajo, la energ\u00eda incidente podr\u00eda ser significativamente mayor que la calculada.<\/p><h2><strong>L\u00edmite de arco el\u00e9ctrico<\/strong><\/h2><p>Otro componente importante del estudio es el l\u00edmite del arco el\u00e9ctrico. La energ\u00eda incidente disminuye exponencialmente con la distancia y este l\u00edmite se define como la distancia desde el arco el\u00e9ctrico donde la energ\u00eda incidente cae a 1,2 cal\/cm2. Este valor se considera la energ\u00eda que puede producir la aparici\u00f3n de una quemadura de segundo grado y trabajar a una distancia menor que esta requiere el uso de la protecci\u00f3n adecuada.<\/p><h3><strong>Selecci\u00f3n de EPP y etiquetas de advertencia<\/strong><\/h3><p>Los dos componentes finales del estudio son la selecci\u00f3n de ropa y equipos de protecci\u00f3n adecuados y la creaci\u00f3n de etiquetas de advertencia de arco el\u00e9ctrico.<\/p><p>La ropa y el equipo de protecci\u00f3n deben seleccionarse con una clasificaci\u00f3n de arco que sea suficiente para la energ\u00eda incidente calculada. Muy a menudo se especifican dos clasificaciones de arco. La primera es para la protecci\u00f3n que se usa de manera m\u00e1s regular y es adecuada para la mayor\u00eda de las ubicaciones. La segunda clasificaci\u00f3n es m\u00e1s alta y se usa en lugares donde la energ\u00eda incidente es mucho mayor.<\/p><p>El estudio de arco el\u00e9ctrico facilita enormemente la creaci\u00f3n de etiquetas de advertencia porque toda la informaci\u00f3n necesaria forma parte de los resultados del estudio. Muchos programas inform\u00e1ticos generan las etiquetas autom\u00e1ticamente incorporando resultados del estudio, como la energ\u00eda incidente, la distancia de trabajo, el l\u00edmite del arco el\u00e9ctrico y otra informaci\u00f3n importante directamente en las etiquetas.<\/p><h2><strong>\u00a1Est\u00e1 todo ah\u00ed!<\/strong><\/h2><p>Si bien los resultados del estudio de arco el\u00e9ctrico pueden facilitar en gran medida el cumplimiento de la norma NFPA 70E, es importante reconocer que los c\u00e1lculos son, en el mejor de los casos, aproximados y se basan en teor\u00edas e investigaciones. Los trabajadores pueden sufrir lesiones o sufrir da\u00f1os m\u00e1s graves durante un arco el\u00e9ctrico. El enfoque m\u00e1s seguro siempre ser\u00e1 colocar el equipo en condiciones de funcionamiento el\u00e9ctricamente seguras.<\/p><p><strong>Por <a href=\"https:\/\/brainfiller.com\/es\/jim-phillips\/about-jim-phillips\/\">Jim Phillips<\/a> | Brainfiller, Inc. | Foro ArcFlash.com<br \/>Publicado originalmente: noviembre de 2011 |\u00a0<a href=\"http:\/\/www.ecmag.com\/\">Revista del contratista el\u00e9ctrico<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>In the earlier years of NFPA 70E and the emergence of arc flash protection requirements, many people would use the NFPA 70E Hazard\/Risk Tables to determine what arc rated PPE to wear. This approach continues to shift towards the use&#8230;<\/p>","protected":false},"author":2,"featured_media":27704,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[419,410,406,7,404,403,407,408],"tags":[],"class_list":["post-2547","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-2024-nfpa-70e","category-arc-flash-labeling-and-compliance-requirements","category-arc-flash-safety-and-hazard-analysis","category-brainfiller-library","category-electrical-power-system-design-and-analysis","category-electrical-safety-codes-and-standards","category-emerging-electrical-safety-technologies-and-trends","category-short-circuit-analysis-and-fault-current-calculations"],"acf":[],"yoast_head":"<!-- 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