by wwhitney (Posted Fri, 07 Jun 2013 16:16:32 GMT)
The chart is Table 250.122. The answer to your question is yes, to comply with 250.122(B). That section says if you have made the ungrounded conductor(s) larger than required, then you have to make the EGC larger than normal. As an example, it is a violation of 250.122(B) to land NM Cu 6/2 cable on a 40 amp breaker, odd as that sounds.
Cheers, Wayne
91040 wrote:
Confused about the ground wire size in relation to the current carrying wires. Looking at the chart (2008 NEC 250.122(B))- do you ever have to size a copper ground bigger than #8, up to 100A or #6, up to 200A?
The chart is Table 250.122. The answer to your question is yes, to comply with 250.122(B). That section says if you have made the ungrounded conductor(s) larger than required, then you have to make the EGC larger than normal. As an example, it is a violation of 250.122(B) to land NM Cu 6/2 cable on a 40 amp breaker, odd as that sounds.
Cheers, Wayne
