[GreenKeys] History - Why voltages and frequencies are chosen(5v & 3.3v l...

[Sheldon Daitch]

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[Most common industrial is 480/277 Wye grounded neutral. Larger facilities are "primary metered" at 13.8 kV and get better rates as the company bought and maintains MV switchgear and transformers. ]

Another reason to meter on the primary side, is that the customer eats (pays for) the losses in the transformers.

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