size of the ground wire

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emahler said:
why not? if the insulation is equal and you are not paralleling them...i am by no means definitive on this, haven't even contemplated looking it up...just thinking out loud
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I haven't either, but don't seem to remember having seen anything about it in the code. Now, I don't have the best memory capability around (and it is getting worse with each year), but think that I would remember something like that. e/m
 
roger said:
Absolutely.

Even in parallel installations you could use different materials for individual phases in the same or individual conduits

Roger
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Thanks Roger for the piece of mind. I would hate the thought of pulling those four wires yet again!! e/m
 
AlWired said:
Why would the transfer switch need to be service rated?
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I don't think that it does, however, from discussions on another thread, I get the impression that if it is service rated, then you spare yourself a disconnect ahead of it, else, you're going to need to put in a disconnect ahead of it. This is what we had to do. e/m
 
250.122?

250.122?

Thanks Chris for the reference to the table in 250.122. The breaker is 150A, so I am sure that #4 wire is adequate. e/m
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I do not have my code book handy but I believe the generator is considered a seprately derived system so you would need to size the ground wire per 250.66 based on the cmills of the conductor not the ocpd.
 
Mike01 said:
I do not have my code book handy but I believe the generator is considered a seprately derived system so you would need to size the ground wire per 250.66 based on the cmills of the conductor not the ocpd.
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I talked to the inspector, and he gave me a verbal ok on #6 copper. Hope that it will be adequate in this case. I know that for the 150 amp rating of the generator a 2/0 alum would have been adequate for the neutral and the hot conductors. We oversized to 4/0 mostly to avoid excessive voltage drop. Table 250.66 prescribes #6 copper for 2/0 and 3/0 aluminum. So maybe, in light of the fact that 2/0 would have been adequate, then #6 copper for ground is ok. e/m
 
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