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______% of electrical injuries and fatalities among “qualified workers” are caused by arc flash (Bureau
of Labor Statistics).
Activities with high potential for exposure to arc flash include:
Potential arc flash causes may include:
Temperatures associated with an arc flash can be up to 35,000 Fahrenheit.
When working around exposed live conductors insulated tools must be used.
An arc blast may produce molten shrapnel, sound waves, and damaging pressure waves.
NFPA 70E uses two hazard categories based on the incident energy of a circuit.
According to NFPA 70E, the flash protection boundary is the approach distance from an exposed live part where a person could receive at least a second degree burn should if within the boundary when an arc flash occurs.
Phenomenon where a flashover of electric current leaves its intended path and travels through the air from can be caused from:
Three factors determine severity of arc flash injury