If You Must Work on Energized Circuits If it has been determined that deenergizing a circuit is not feasible and the employee must work “hot”, the employer shall develop and enforce safety-related work practices to prevent electric shock or other injuries resulting from either direct or indirect electrical contacts. Here are a few of the protective methods: Some of the methods are for the protection of qualified employees doing work on electrical circuit and other methods are geared towards non-qualified employees who work nearby energized equipment. There exists a number of ways to protect workers from the threat of electrical hazards. Some equipment will have a greater flash protection boundary while other equipment will have a lesser boundary. This distance is not common between equipment. Prohibited Approach (inner boundary)Ī distance from an exposed part which is considered the same as making contact with the live part. Restricted Approach BoundaryĪn approach limit boundary is the distance from an exposed live part where a shock hazard is immanent. Limited Approach BoundaryĪn approach limit boundary is the distance from an exposed live part where a shock hazard may exist. The issue here is the heat generated from a flash that results in burns. If an arc flash occurred, this boundary is where an employee would be exposed to a curable second degree burn (1.2 calories/cm2 ). These boundaries are: Flash Protection Boundary (outer boundary)Īn arc flash boundary is the farthest established boundary from the energy source. The National Fire Protection Association (NFPA) has developed specific approach boundaries designed to protect employees while working on or near energized equipment.
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