Electrical Safety and Power Line Awareness Flashcards

If a crane operator must exit a cab after the equipment has become energized from power line contact and cannot be freed, what is the recommended escape technique?

Answer: Jump clear of the crane, land with feet together, then shuffle away in small steps

Jumping clear with feet together minimizes step potential exposure upon landing, and shuffling away with feet close together prevents creating a current path through the legs while exiting the energized zone.

What is 'electrical flashover' in the context of crane operations near power lines?

Answer: An electrical arc that jumps through the air from an energized conductor to the crane without physical contact

Electrical flashover occurs when the voltage gradient exceeds the air's insulating capacity, causing current to arc between an energized power line and nearby equipment even without physical contact.

What should a crane operator do if a lightning storm develops during operations near power lines?

Answer: Suspend all operations immediately and move equipment to a safe distance

Lightning dramatically increases the electrical hazard near overhead lines; all crane operations must be suspended and equipment repositioned to a safe location until the storm passes.

Physical barricades marking the minimum approach distance to power lines during crane operations are typically what color?

Answer: Red flags or cones indicating a danger or exclusion zone

Red flags, cones, or barriers are placed at the minimum approach distance perimeter to visually warn equipment operators and workers that they are entering the restricted electrical hazard zone.

In addition to crane operator certification, what additional training do many employers and job sites require before working near energized power lines?

Answer: Completion of a power line safety or electrical awareness training course

Many employers and job sites require crane operators to complete specific power line safety or electrical hazard awareness training in addition to their standard crane operator certification.

What is the primary responsibility of a safety watch (spotter) assigned during crane operations near overhead power lines?

Answer: To monitor the crane boom's clearance from power lines and warn the operator before the minimum distance is breached

The safety watch/spotter's sole duty is to maintain visual contact with the power lines and alert the operator whenever the equipment approaches the minimum clearance boundary.

If a ground worker finds themselves within the step potential zone when a crane contacts a power line, how should they exit the hazard area?

Answer: Shuffle with feet kept close together in small steps away from the crane

Shuffling with feet kept close together eliminates the voltage difference between the two ground contact points, preventing current from flowing through the legs and body while exiting the step potential zone.