Transformer Installation Safety, Part 4

Energizing the transformer is typically the last step of the installation. Before energizing, do the following:

• Verify the wiring and connections are correct.
• Visually check for any tools or parts inside the housing, and perform a tool count.
• Ensure the transformer cover is on and properly secured.
• Ensure there are no ground faults in the associated panel or switchgear.
• To reduce the chance of an arc blast, open the load breakers (in the associated panel or switchgear).
• Clear the area near the transformer of anyone who doesn’t need to be there. If it’s a dry-type transformer, ensure nobody is standing near the vent. If it’s an overhead transformer, ensure nobody is standing under it.
•  When closing the disconnect to the transformer, stand to one side of the disconnect rather than directly in front of it. Typically, this means standing to the right of the disconnect (handle side) and operating the handle with your left hand.

After you energize the transformer, close each load breaker one at a time.