The National Fire Protection Association (NFPA) recommends a series of protective boundaries around live electrical equipment. These boundaries, defined in the NFPA 70E standard, provide a simple and effective way to protect workers from the hazards of arc flash and electric shock.
While different equipment will have these boundaries placed at different distances, each boundary always serves the same purpose. This infographic shows the differences between boundaries, helping you and your workers stay safe around powered electrical equipment.
The following is a transcript of the Arc Flash Boundary infographic:
Electrical Safety Boundaries
The 2018 edition of NFPA 70E describes these boundaries around electrical equipment. Identifying them can help to protect workers from electric shock and arc flash.
Arc Flash Boundary
This is the distance from equipment at which an arc flash could cause second-degree burns. Unprotected workers should keep clear.
Limited Approach Boundary
Workers without special training should stay outside this boundary, unless they have appropriate protection and are escorted by a specially-trained person.
Restricted Approach Boundary
Only specially-trained workers should cross this boundary. When work is to be performed on energized equipment, crossing this line requires an approved written work plan.