I would like some clarification on 250.122(b) and the following situation:
240/480V, single phase with 30A breaker. The smallest wire size is a #4 and it increases progressively to a #1.
The client's preference is to match the ground conductor to the ungrounded conductors. However, when we get to the #1's, they do not meet conduit fill requirements. A possible solution is to use a #2 ground with the #1 ungrounded conductors.
How does 250.122(b) and Table 250.122 apply in this sense? While the ungrounded conductors do increase in size from #2 to #1 due to voltage drop, can the grounded conductors remain #2 since they appear to be oversized already?
240/480V, single phase with 30A breaker. The smallest wire size is a #4 and it increases progressively to a #1.
The client's preference is to match the ground conductor to the ungrounded conductors. However, when we get to the #1's, they do not meet conduit fill requirements. A possible solution is to use a #2 ground with the #1 ungrounded conductors.
How does 250.122(b) and Table 250.122 apply in this sense? While the ungrounded conductors do increase in size from #2 to #1 due to voltage drop, can the grounded conductors remain #2 since they appear to be oversized already?