Arc Flash Boundary Infographic
Designed by Joe Hanson
There are 8 boundary zones to Arc Flash. The flash protection boundary is an imaginary sphere that surrounds the potential arc point "within which a person could receive a second degree burn if an electrical arc flash were to occur," according to NFPA 70E. This standard also defines the incident energy level as "the amount of energy impressed on a surface, a certain distance from the source, generated during an electrical arc event."
At the core or center the exposure is the greatest. This is any point on an exposed, energized electrical conductor or circuit part. Moving outward are:Click for larger display