What procedures ensure a large electrical transformer is safe to lift?

• A. Leave energized; use insulated gloves.
• B. De-energize and ground the transformer, verify zero energy, and use rigging appropriate for the load and center of gravity.
• C. Only de-energize but do not ground.
• D. Only check the weight; no need to de-energize.

Answer: (B)

The key idea is to eliminate electrical hazards and ensure the lift is mechanically safe. De-energizing the transformer removes power so you’re not exposed to shock or arc flash during the lift. Grounding (bonding) provides a safe path for any stored or capacitive energy to dissipate and helps prevent floating voltages that could surprise workers if the load shifts. Verifying zero energy confirms there’s no residual energy left in the system, including stored charges or capacitors, before you move the transformer. Finally, using rigging that is properly rated for the load and arranged with respect to the center of gravity keeps the lift balanced and stable, reducing the risk of swinging, slipping slings, or tipping.

Leaving the equipment energized, or relying only on de-energizing without grounding, ignores potential stored energy and voltage that could pose a shock or arc risk. Checking only the weight misses the electrical hazards entirely, and not grounding or verifying zero energy leaves the system able to re-energize unpredictably. So the combination of removing energy, confirming it’s gone, and planning the lift with correct rigging for the load and its center of gravity is the safest, most complete approach.