Electrical Safety and Power Line Awareness Flashcards
7 cards from real MASS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Safety and Power Line Awareness flashcards as text
According to OSHA 29 CFR 1926.1408, what is the minimum clearance distance required between a crane and overhead power lines rated up to 350kV during operations?
Answer: 20 feet
OSHA 29 CFR 1926.1408 requires a minimum 20-foot clearance from power lines rated up to 350kV during crane and derrick operations.
If a crane becomes energized after contacting a power line and the operator CANNOT move the equipment free, what is the correct action?
Answer: Remain in the cab and warn all ground personnel to stay away
When equipment is energized and cannot be freed, the operator must stay in the cab and warn others to stay clear until the utility company de-energizes the line.
Before beginning crane operations near overhead power lines, who is responsible for determining the voltage of those lines?
Answer: The employer or lift director
OSHA places the legal responsibility on the employer to identify overhead power line hazards, including determining voltage, before operations begin.
What is the primary purpose of an electrical proximity warning device (EPD) mounted on a crane?
Answer: To alert the operator when approaching the minimum clearance distance from energized power lines
Electrical proximity warning devices provide audible and/or visual alerts to crane operators as they approach the minimum safe clearance distance from energized conductors.
What document or confirmation must be obtained from the utility company before a crane may operate inside the minimum approach distance to power lines?
Answer: Written confirmation that lines have been de-energized, grounded, or insulated
OSHA requires written confirmation from the utility that lines are de-energized and grounded, or physically insulated, before any crane work is permitted inside the minimum clearance.
If a ground worker observes a crane boom contact an overhead power line, what is the FIRST action they should take?
Answer: Warn all personnel in the area to stay away from the crane
The immediate priority is preventing additional electrocutions; ground workers must clear the area because the ground around an energized crane can itself carry lethal step potential.
Which of the following correctly describes the 'restricted approach boundary' in the context of electrical safety near power lines?
Answer: The zone around energized conductors where unqualified workers must not enter without protection
The restricted approach boundary defines the zone near energized conductors where unqualified workers face shock risk and must not enter without specific protective equipment and authorization.