3/17/2024 0 Comments Arc flash approach boundaries![]() In this case, the Arc Flash Boundary offers another related benefit it tells workers when they need specific gear. Staying away from the equipment is an easy way to keep safe, but sometimes a worker must get closer to do their work. ![]() Staying outside the Arc Flash Boundary is a way to reduce or eliminate injuries from an arc flash. The Arc Flash Boundary helps him to determine a safe distance. The electrical worker has to be able to determine his relative risk, according to the distance from the equipment. The Arc Flash Boundary was developed at OSHA’s request by the NFPA to help companies, electrical workers, and employees avoid workplace injuries and fatalities due to shock, electrocution, arc flash, and arc blast, when working in proximity to energized electrical equipment. The Arc Flash Boundary determines the distance from the equipment at which the Incident Energy of an arc flash would be 1.2 cal/cm². The Arc Flash Boundary marks the distance from the equipment at which the Incident Energy of an arc flash would be. These burns are caused by the extreme heat given off by the runaway arc the radiant heat that spreads out in all directions.Īs a result, NFPA 70E includes a “stay-back” distance intended to limit these burns. (2) The energized electrical conductors or circuit parts are insulated from the qualified person and from any other conductive object at a different potential.In an arc flash, the most common and most severe injuries are burns. Insulating gloves and sleeves are considered insulation only with regard to the energized parts upon which work is performed. (1) The qualified person is insulated or guarded from energized electrical conductors or circuit parts operating at 50 volts or more. No qualified person shall approach or take any conductive object closer to exposed energized electrical conductors or circuit parts than the restricted approach boundary set forth in Table 130.4(D)(a) and Table 130.4(D)(b), unless one of the following conditions applies: Under no circumstance shall unqualified person(s) be permitted to cross the restricted approach boundary. Where there is a need for an unqualified person(s) to cross the limited approach boundary, a qualified person shall advise the unqualified person(s) of the possible hazards and continuously escort the unqualified person(s) while inside the limited approach boundary. (3) Entering the Limited Approach Boundary. ![]() Where one or more unqualified persons are working at or close to the limited approach boundary, the designated person in charge of the work space where the electrical hazard exists shall advise the unqualified person(s) of the electrical hazard and warn him or her to stay outside of the limited approach boundary. (2) Working at or Close to the Limited Approach Boundary. Unless permitted by 130.4(E)(3), no unqualified person shall be permitted to approach nearer than the limited approach boundary of energized conductors and circuit parts. The shock protection boundaries and the arc flash boundary are independent of each other. Informational Note: In certain instances, the arc flash boundary might be a greater distance from the energized electrical conductors or circuit parts than the limited approach boundary.
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