![]() ![]() Other diagnostic tests often apply 150% of the cable’s voltage rating, further stressing the cables and accelerating deterioration.Ĭable deterioration leads to system failure and poor reliability. Based on the DC Polarization/Depolarization Current Measurement principle, it’s a non-destructive method that applies a maximum of 30% of the cable’s voltage rating. This unique, on-site diagnostic service determines the health of XLPE cables while preserving their integrity. ![]() We have partnered with National Research Council Canada (NRC), the Government of Canada’s premier research and technology organization, to diagnose the health of XLPE cables without damaging them. Three of these methods will be examined in this section-the theoretical model, the equations and tables used in NFPA 70E.Įnergy Ottawa offers a state-of-the-art, non-destructive cable measurement system for the dependable assessment of medium voltage distribution cables. The incident energy level could be determined using one of the several arc-flash software programs that are currently available on the market.Īs understanding of NFPA 70e calculations has grown, several methods for calculating the hazard have been developed. NFPA 70E doesn't specify that the IEEE Std. 1584, but the latter goes into more detail. It covers employee protection from the electrical hazards of shock, arc flash and arc blasts.Īnnex D in NFPA 70E offers the same incident energy level equations that appear in IEEE Std. ![]() It is one of the foremost consensus standards for electrical safety. NFPA 70E arc flash regulations have been developed by the National Fire Protection Association as a standard for Electrical Safety in the Workplace. The analysis shall determine the Flash Protection Boundary and the personal protective equipment that people within the Flash Protection Boundary shall use.” This is outlined by NFPA 70E - 2004, Electrical Safety Requirements for Employee Workplaces, states, “A hazard analysis shall be done in order to protect personnel from the possibility of being injured by an arc flash. This explosive energy is measured in calories/cm2. NFPA 70e calculations are necessary to properly determine the explosive arc flash energy level of a worker who could be exposed. ![]()
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