UNDERSTANDING ARC FLASH HAZARDS Eaton（伊顿理解电弧闪光危害）.pdf

UNDERSTANDING ARC FLASH HAZARDS Kevin J. Lippert Donald M. Colaberardino Clive W. Kimblin Eaton Electrical Eaton Electrical Eaton Electrical 170 Industry Drive 170 Industry Drive 170 Industry Drive Pittsburgh, PA 15275 Pittsburgh, PA 15275 Pittsburgh, PA 15275 ABSTRACT - The purpose of this paper is to clarify the their standard Code of Federal Regulations, CFR [3] use of the recently published IEEE 1584, “Guide for 1910.333, Selection and Use of Work Practices, which Performing Arc-Flash Hazard Calculations.”[1] The paper states “Safety-related work practices shall be employed also discusses the reduction of arc flash hazards by the to prevent electric shock or other injuries resulting from current limitation of molded case circuit breakers. either direct or indirect electrical contacts, when work is Understanding arc flash hazards is a critical element in performed near or on equipment or circuits which are or order to reduce the risk of electrical accidents and personal may be energized.” This general statement provides injuries. The Guide contains formulas to numerically the basis for OSHA’s citing and insisting upon quantify the arc flash energy and includes an Excel compliance with the Arc Flash requirements contained Spreadsheet “Arc-Flash Hazard Calculator.” This in NFPA 70E. Spreadsheet