What is required before performing work on electrical equipment?

• A. Inspect the equipment and proceed.
• B. Call a supervisor for a sign-off.
• C. De-energize the equipment, apply lockout/tagout, and verify zero energy.
• D. Wear personal protective equipment only.

Answer: (C)

Before doing any work on electrical equipment, you must isolate it from all energy sources, secure that isolation with lockout and tagout devices, and verify that there is zero energy present. De-energizing the equipment stops the current flow, lockout devices prevent anyone from re-energizing it, and tags warn that the equipment must not be energized. Verifying zero energy with the right testing tools confirms there’s no stored or residual energy lurking in capacitors, springs, or other parts, so maintenance can be performed safely.

Relying on inspecting the equipment and proceeding ignores hidden or stored energy and can lead to shock or an arc flash. Wearing personal protective equipment alone does not remove or control energy, and a supervisor’s sign-off does not substitute for properly isolating, locking out, and confirming zero energy. Follow the established lockout/tagout procedures and verify the energy state before starting work.