Substation Transformer Tap?

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netaguy

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Location
Providence, RI
This is a first for me. 28 y/o transformer.

I had to trace the wiring out twice before I actually convinced myself that a 120V tap was factory in a dry 2000KVA 13,800-480/277V Square D core and coil transformer.

The wiring was routed into the main breaker section of the 480V lineup to a 10A 250V fuse and served as power for the transformer cooling fans via controller.

Anyone seen this before?
 
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