The final task for removing a transformer requires the lineworker to do what?

• A. Attach a service drop
• B. Remove the case ground wire
• C. Tighten all bolts
• D. Install a new case ground

Answer: (B)

Grounding a transformer case is there to keep the enclosure at earth potential and provide a safe fault path during operation. When you’re removing the transformer, the unit must be isolated from the grounding system to prevent any live or fault current from finding a path through the enclosure as you disconnect and lift the equipment. Disconnecting the case ground wire is the final step in this isolation process, ensuring the transformer is fully separated from the grounding network before removal. The other options don’t fit the removal sequence: attaching a service drop would re-energize or reconnect service, tightening bolts is part of reassembly or maintenance, and installing a new case ground would be done only if re-grounding after installation.