I found some code references saying that an equipment ground wire should be either equal in size to the power conductor to the equipment or based on the amperage of the circuit protection device. For example, a device on a 20A breaker would use the larger of 12ga or the size of the power conductor to the device.
But then you have things like R56 calling for nothing smaller than 6 gauge. And then I have manufacturer installation guides which may go a step further and call for 4 gauge or 2 gauge. So why the apparent overkill? Is it for mechanical robustness? Performance even if connections are corroded or incorrectly torqued? I'm ok with all of that, I'm just wondering if they just want a big safety margin or if there's some electrical reason why I'd need a 2 gauge ground for a piece of equipment with 70A @ -48VDC breakers. -Adam
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