I have a 3 wire vs. a 4 wire question for you folks out there. My primary transformer has a 12470 volt, 3 phase delta primary - 4160Y2402 secondary. However, my loads on the secondary of the transformer are all 3 phase, 3 wire loads (large motors). Can I ground the XO terminal on the secondary of the transformer at the transformer and not pull a fourth wire into my switchgear, or is that neutral wire required all the way through the system?
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