edgutah
Member
- Location
- salt lake city utah
NEC 2008 section 250.122 (D) (2) now requires a different calculation when sizing the grounding conductor when using an MCP (motor circuit protector). this new calculation invalidates the standard size grounding conductor now supplied in type TC cables and Armored 600V power cables. When you go to 100HP and above motors the standard ground wire in these cables are undersized by one. Does any one know if the cable manufactures are going to upgrade their cables to meet the new code requirement or are we going to be forced to upsize feeder cables or run individual conductors.