Electrical Hazards Analysis

D. K. Neitzel
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Abstract

The subject of electrical hazards analysis has been recognized by a small segment of the electrical industry for many years. The petrochemical industry and many government institutions have performed research on this subject for over twenty years. For the most part however, the electrical industry, at least at the user level, has largely ignored the subject, essentially reacting to catastrophic accidents, rather than proactively trying to predict and prevent them. Recent changes in consensus standards, along with a better general understanding of the seriousness of electrical hazards have resulted in a renewal of interest in the subject. As the awareness of electrical hazards increase many are puzzled by phrases like; "limited", "restricted", and "prohibited approach boundary", and "flash protection boundary". Understanding these terms is important to understanding shock and arc-flash hazard protection. NFPA 70E-2004, Standard for Electrical Safety in the Workplace requires that an electrical hazards analysis be performed prior to working on or near exposed energized electrical conductors and circuit part operating at 50-volts or more. This is especially critical if the circuits have not been placed in an electrically safe work condition. This paper addresses the requirements to perform the "shock hazard analysis" and the "flash hazard analysis" required by NFPA 70E-2004, Section 110.8(B)(1), "electrical hazard analysis" as well as the "blast hazard analysis" and personal protective equipment requirements
电气危害分析
多年来,电气危害分析这一主题一直被电气行业的一小部分人所认可。石油化工行业和许多政府机构对这一课题进行了二十多年的研究。然而,在大多数情况下,电力行业,至少在用户层面上,在很大程度上忽略了这个问题,基本上是对灾难性事故做出反应,而不是主动尝试预测和预防它们。最近共识标准的变化,以及对电气危害严重性的更好的普遍理解,导致了对该主题的兴趣的更新。随着对电气危害意识的提高,许多人对诸如;“限制”、“限制”、“禁止进近边界”和“闪光保护边界”。理解这些术语对于理解电击和电弧闪光危险防护很重要。NFPA 70E-2004《工作场所电气安全标准》要求,在接触或接近暴露的带电导体和在50伏或更高电压下工作的电路部件之前,必须进行电气危害分析。如果电路没有置于电气安全的工作条件下,这一点尤其重要。本文阐述了NFPA 70E-2004第110.8(B)(1)节“电气危害分析”以及“爆炸危害分析”和个人防护设备要求的“冲击危害分析”和“闪光危害分析”的要求
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