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It provides general guidance on the causes of arc flash events and the dangers to personnel, along with a risk assessment process and hierarchy of control measures that can be used to reduce the likelihood of an arc flash and reduce its potential dangers.

An arc flash (also called a flashover), is the light and heat produced as part of an arc fault, a type of electrical explosion or discharge that results from a low-impedance connection through air to Earth or another voltage phase in an electrical system. ... so the risk of arc flash cannot simply be controlled through isolation.

As part of a larger training and safety program, these boundaries are put in place to minimize risk through avoidance or the use of PPE. Limited and Restricted Approach boundaries deal with shock and are determined by NFPA 70E Tables 130.4(C)(a) for AC systems and 130.4(C)(b) for DC systems, while Arc Flash boundaries are determined through an ...

NFPA 70e hierarchy for controlling arc flash risk. The most important part of the arc flash risk assessment, after ensuring the firefighter's personal safety is eliminating or mitigating the risk going forward.NFPA 70e details a hierarchy of methods for controlling risk: Eliminate the risk; Substitute an alternate method of operation