I am trying to determine the Equipment Grounding Conductor size for a 13.8kV feeder circuit based on Table 250.122. The feeder breaker being used is a 13.8kV 1200A frame breaker with the relay overcurrent pickup setting set to 160A. It has always been my understanding that you base the Ratting or setting of the overcurrent device based on the actual relay pickup setting and not the breaker frame size when using 250.122. I believe 250.190(C)(3) provides confirmation that this is correct.
So in my case with a relay pickup setting of 160A I would use the 200A setting value in table 250.122 and thus require a EGC size of #6AWG or larger.
Am I correct in my thinking here, or am I missing something or some other exception in the code.
Thanks
So in my case with a relay pickup setting of 160A I would use the 200A setting value in table 250.122 and thus require a EGC size of #6AWG or larger.
Am I correct in my thinking here, or am I missing something or some other exception in the code.
Thanks