Which step is essential before lifting a large electrical transformer?

• A. Leave energized but isolated using barriers.
• B. De-energize the transformer, verify zero energy, and use rigging appropriate for the load and CG.
• C. Only ground the transformer; de-energizing is not required.
• D. Inspect for visual damage and proceed.

Answer: (D)

The essential step is to remove all energy from the transformer and confirm it is zero energy before any lifting, then plan rigging that matches the load and its center of gravity. De-energize the equipment and apply lockout/tagout so it cannot be re-energized during the lift, and have a qualified person verify that there is no stored or residual energy using proper testing methods. Only after you’ve confirmed zero energy can you attach rigging that is rated for the weight and positioned at appropriate lifting points, with awareness of the transformer’s center of gravity to keep the load balanced and stable. This approach protects workers from shock or arc flash and prevents the load from shifting or tipping during the lift. Visual inspection or grounding alone does not remove electrical hazards, and proceeding with the lift without de-energizing leaves crews at serious risk.