OSHA 30hr Construction- 14 - Arc Flash
and Electrical Safety Best Practices
(NFPA 70E 2024) Exam with correct
answers
What is arc flash? - correct answer -Arc flash is the visual electrical light and heat that occur during an
arc fault
What's the minimum voltage at which serious electric shock can occur? - correct answer -50 volts
What determines the severity of injury in arc flash? - correct answer -The available current and duration
of the arc flash
What injuries are associated with electric shock? - correct answer -A. Electrocution
B. Suffocation
C. Tissue and organ damage
D. All of the above - Correct Answer
How are arc flash and electric shock protection boundaries determined? - correct answer -Qualified
workers use NFPA 70E boundary tables or the employer's safe work practices tables to determine arc
flash and shock protection boundaries.
What is an arc flash protection boundary? - correct answer -The distance from energized equipment at
which a worker, unprotected by proper PPE, would sustain burns less than those from a mild sunburn
What constitutes an "electrically safe condition"? - correct answer -Equipment is locked and tagged in a
de-energized position and then tested to ensure there is no stored or protentional energy
Who can enter limited and restricted boundaries? - correct answer -Electrically-qualified workers and
those undergoing on-the-job training with demonstrated ability to safely perform the required task
OSHA 30hr Construction- 14 - Arc Flash and Electrical Safety Best Practices (NFPA 70E 2024)
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