Safety Procedures Flashcards

Under NFPA 70E, what document or label tells a worker the incident energy and required PPE before working on an energized panel?

Answer: Arc flash warning label

Arc flash labels display incident energy or PPE category and the arc flash boundary for that equipment.

What is the preferred method of protecting workers from electrical hazards according to NFPA 70E?

Answer: Establish an electrically safe work condition by de-energizing

De-energizing and verifying absence of voltage is the primary protective strategy; PPE is the last line of defense.

When verifying the absence of voltage with a meter, what should be done before and after testing the circuit?

Answer: Test the meter on a known live source

The live-dead-live test confirms the meter is working so a dead reading can be trusted.

A GFCI device trips when it detects a current imbalance of approximately how much?

Answer: 5 milliamps

Class A GFCIs trip at about 4 to 6 mA of leakage to protect people from shock.

Which fire extinguisher class is appropriate for a fire in an energized electrical motor control center?

Answer: Class C

Class C agents are non-conductive and rated for energized electrical equipment fires.

What does the acronym PASS describe when operating a portable fire extinguisher?

Answer: Pull, Aim, Squeeze, Sweep

PASS reminds users to pull the pin, aim at the base, squeeze the handle, and sweep side to side.

When performing hot work such as welding near combustibles, how long does OSHA generally require a fire watch to continue after the work is complete?

Answer: At least 30 minutes

OSHA 1910.252 requires the fire watch to be maintained for at least a half hour after hot work is completed.