What is an arc flash protection boundary?

An arc flash protection boundary is the distance at which an employee must be located from an exposed energized electrical conductor or circuit part in order to avoid potential injury from an arc flash incident. The arc flash protection boundary is calculated based on the potential energy of the electrical system, the available fault current, and the time it would take for protective devices to clear a fault.

The arc flash protection boundary is typically marked with caution signs and barricades to prevent unauthorized personnel from entering the area. Only qualified electrical workers wearing appropriate personal protective equipment are allowed within the arc flash protection boundary when conducting work on or near energized electrical equipment.

It is important for employers to conduct regular arc flash hazard analysis and provide proper training for employees to ensure they understand the risks associated with arc flash incidents and the precautions that must be taken to prevent injury. Failure to comply with arc flash protection boundaries and safety measures can result in serious injury or death.