The following segment will provide an overview of the three general categories of electrical hazards – electric shock, arc flash, and arc blast – and how to protect workers from injury due to these hazards.

Electricalsafety

Electricalcondition example

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Establishing an Electrical Safety Program requires a multi-tiered approach that includes identification, planning, and training.

As per NFPA 70E-2108, the arc flash boundary defines the point where a person is likely exposed to a second-degree burn from and arc flash incident. A person still may get burned outside of this boundary, but would typically be less than a second-degree burn. NOTE: The arc flash boundary can be either inside or outside of the shock protection boundaries

Safety measures when usingelectricalappliances

As per NFPA 70E, shock protection boundaries must be established where approaching personnel are exposed to energized electrical conductors or circuit parts. The dimensions are based on maximum voltage of potential exposure, and can be found in Table 130.4(D)(a) of NFPA 70E-2018 for ac systems or 130.4(D)(b) for dc systems.

While the preferred method of mitigating exposure to electrical hazards is to completely remove the source of electrical energy, it is not always practical. Therefore it is imperative that all electrical hazards are identified, plans are created to mitigate exposure, and proper training and tools are provided to workers to prevent harm from these hazards.