how to test a 480v to 120 transformer?

To test a 480V to 120V transformer, first ensure safety by disconnecting power and using appropriate personal protective equipment. Then, check the primary and secondary windings for continuity with a multimeter. Measure the input voltage (480V) and output voltage (120V) while the transformer is energized, ensuring the output is within acceptable limits. Additionally, inspect for any signs of overheating or insulation failure. Finally, verify the transformer’s grounding and connections for safety.