who requires ppe in arc flash boundaries

Some equipment will have a greater flash protection boundary while other equipment will have a lesser boundary. This distance is not common between equipment. The Prohibited Approach Boundary is defined as a distance from an exposed part which is considered the same as making contact with the live part. The Restricted Approach Boundary is defined as approach limit at a distance from an exposed live part which there is an increased risk of shock.Īrc Flash Prohibited Approach Boundary (inner boundary) Where there is a need for an unqualified person(s) to cross the Limited Approach Boundary, NFPA 70e dictates that a qualified person shall advise him or her of the possible hazards and continuously escort the unqualified person(s) while inside the limited Approach Boundary. The Limited Approach Boundary is defined as an approach limit at a distance from an exposed live part where a shock hazard exists. If an arc flash explosion occurs within this boundary, it is considered that an electrical worker would be exposed to a curable second degree burn (1.2 calories/cm2 ). The Flash Protection Boundary is the calculated safe working distance from electrical equipment which would not expose the employee to the hazards associated with an electrical arc flash. Arc Flash Prohibited Approach Boundary (inner boundary)Īrc Flash Protection Boundary (outer boundary).Arc Flash Protection Boundary (outer boundary).

There are four main Arc Flash Boundaries: Arc Flash Boundary is the distance at which an electrical arc can flash outward, which may endanger electrical workers near electrical equipment.

Who requires ppe in arc flash boundaries