![]() ![]() Visit the Terms of Use and Privacy Policy for this site. The following two documents are the foundation for truly understanding arc flash calculations: NFPA 70E, Standard for Electrical Safety in the Workplace, 2012 Edition IEEE Std 1584, Guide for Performing Arc-Flash Hazard Calculations, 2002 Edition In this article, we’ll concentrate on NFPA 70E instead of IEEE Std 1584. The gear is being protected by LPJ400SP Class J 600A fuse located upstream. Consider 480V switchgear with a 32 mm (1.26 inches) gap between conductors and 7 kA prospective 3-phase bolted fault current at its terminals. Once there, click on the free access link to NFPA 70E. Arc Flash Analytic - Calculation example. 120/240 volts, 480/277 volts, 600 volts). For the complete section, see the actual NFPA 70E text at NFPA.ORG. The label’s panels can be arranged in either a horizontal or vertical. Additional labeling requirements are also included in Article 110.16 of the 2014 version of the National Electric Code (NEC). Additional panels, such as a safety symbol panel and safety instruction panel, may be included. In the 2015 version of the NFPA 70E standard, arc flash labeling requirements are covered under Article 130.5 (D) and 130.7 (E) (1). Nominal System Voltage A value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g. According to ANSI Z535.4, the label configuration is divided into individual panels and will normally have at least two panels that include the signal word and message panels. To calculate arc flash incident energy levels and Flash Protection Boundaries for your system, What Should Appear on an Arc Flash Label 1. General Flash Protection Boundaries Source: NFPA 70E, National Electrical Code Arc Location Hazard Risk Categories Source: NFPA 70E, National Electrical Code Hazard Risk Categoryįire resistant (FR) pant and shirt, or FR coverallĬotton underwear plus FR shirt and FR pantsĬotton underwear plus FR shirt, FR pants with FR coverallsĬotton underwear plus FR shirt, FR pants, and multi-layered flash suit Requiring a single layer of arc-rated PPE, workers need the following clothing: Required Clothing: Long Sleeve Shirt (or Jacket) and Pants or AR Coverall with minimum arc rating of 4 cal/cm 2. PPE CAT 1 represents the lowest level in which Arc Rated PPE s required. Reference the 2015 NFPA 70E¢ç: Standard for Electrical Safety in the Workplace¢ç for a more complete reference for Arc Flash Hazard calculations and safety. PPE Category 1: Minimum Arc Rating 4 cal/cm2. These tables Hazard Risk Category, PPE requirements, and Flash Protection Boundaries based onĪrc flash incident energy levels.
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