![]() ![]() ![]() These distances are demarcated by approach boundaries that require certain levels of PPE and electrical professional qualifications in order to work within them. ![]() OSHA defines which calculations are acceptable for a given type of system in Appendix E of Standard 1910.269, and it requires that personal protective equipment (PPE) be worn by all workers who the calculations have determined are at risk of being exposed to an arc flash with a strength of at least 2.0 cal/cm 2.Īrc flash calculations are primarily used to prescribe certain mandatory minimum distances from equipment that persons must remain in order to be safe from receiving a hazardous arc flash. However, the calculations that OSHA allows vary depending on the level of voltage, number of electrical phases, and potential containment of the system that is producing the energy. In general, OSHA recognizes the NFPA’s 70e as a consensus standard and views compliance with 70e as sufficient for employers to meet their duty to provide safety. OSHA’s general industry requirements for compliance with electrical safety are laid out in OSHA standard. The results of the calculation are used to determine the protective measures that must be put in place to protect workers and other persons who work on or in the vicinity of the energized equipment. This system may be used for calculating hazards associated with electrical equipment whose properties meet the range of criteria that the tables have been designed to accommodate. The NFPA 70e provides a table-based system for use in workplaces that acts as a substitute for arc flash calculations. For instance, the National Fire Protection Association’s NFPA 70e standard and the IEEE’s 1584 standard (a nine-step process) both use different methods of calculating arc flash strength. There is no single method for performing arc flash calculations. Safeopedia Explains Arc Flash Calculations ![]()
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