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Rotary phase converter: local ground or all the way to the panel?
On 2008-02-27, rpseguin wrote:
Given the cost of copper wire these days, my inclination is to run just the two hots to the panel and to put a grounding rod close up to the garage and run a local ground to it. That is illegal and unsafe. I assume the "primary" side is a 240V motor? You need an equipment ground conductor all the way back to the 240V service. If one of the hots shorts out to the motor case, for example, you need this bonding path to carry enough current to trip the breaker. You can not rely on the earth for the bonding path, its resistance is too high. As for the secondary side, you need to look up in the NEC how to wire a "separately derived system". You can also look up how to wire motor loads to determine the size of the feeder conductors for the primary side. Cheers, Wayne |
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