It is essential that you know what the electrical hazards are in your facility and what to do to keep your workers safe, and, be in compliance with OSHA. An Arc Flash Assessment / Analysis (referred to as 70E Study) is a study of your facilities power system to determine the energy that is available at points in the system where workers can be exposed.
The output of the analysis is a determination and labeling of PPE requirements. It includes summary reports of energy levels of all equipment, fuse and circuit breaker analysis, single-line drawings of the electrical system, and recommendations as to any needed corrective actions.
There are two documents that tell us what we must do to insure worker safety and be in compliance. The first and foremost is OSHA regulations (law) and the second is the National Fire Protection Agency publication 70E “Standard for Electrical Safety in the Workplace” (commonly referred to as NFPA 70E). NFPA 70E is a standard and is referenced in the OSHA regulations. Using NFPA 70E as a guide will insure compliance with OSHA.
So what does that have to do with you? Think about it: OSHA regulations are federal law. They tell you what you have to do, but fall short of telling you how to do it. Not necessarily OSHA’s fault; that’s the way regulations have to be written in order to be enforceable. So if OSHA tells you what to do, but not necessarily how to do it, what do you do? Go to the electrical safety “how-to” book, NFPA 70E.