If you aren’t confident in your knowledge of one of the following subjects, go back to the relevant lesson in the course to give it a review.

• 80% 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, troubleshooting live circuits, opening, or closing circuits and/or grounding circuits.
• Potential arc flash causes may include uninsulated tool contact with a live conductor, Loose wire connections, Accidental contact with live conductors
• 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 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 dust, dropping tools, accidental touching and/or condensation.
• Three factors determine severity of arc flash injury.