eeprom
Electrical
- May 16, 2007
- 482
Hello,
I am working with an Eaton SPX 300 Hp drive. The drive manual recommends that for incoming power cables, phase conductors should be 2 @ 300 kcmil, and the ground conductor should be 1 @ 300 kcmil. The question I have is about the ground. The upstream breaker is 500A. According to NEC, for this size breaker I would need a #2 ground. The Eaton manual recommends a 300 kcmil, which has an ampacity of 250% more than what is required. I've asked Eaton tech support why they recommend such an over-sized ground, and they did not know.
Can anyone here explain why I should use the 300 ground?
Thanks
EE
I am working with an Eaton SPX 300 Hp drive. The drive manual recommends that for incoming power cables, phase conductors should be 2 @ 300 kcmil, and the ground conductor should be 1 @ 300 kcmil. The question I have is about the ground. The upstream breaker is 500A. According to NEC, for this size breaker I would need a #2 ground. The Eaton manual recommends a 300 kcmil, which has an ampacity of 250% more than what is required. I've asked Eaton tech support why they recommend such an over-sized ground, and they did not know.
Can anyone here explain why I should use the 300 ground?
Thanks
EE