Tables 250.102(C)(1) & 250.66

[JDB3]

Would like verification from some of you'll on the following:

If I run 250 aluminum, then #2 aluminum is the smallest permissible grounded (neutral) conductor allowed & #2 aluminum is the smallest permissible grounding electrode(ground) conductor allowed.

 

[augie47]

Is you 250 AL a service conductor or a feeder ?
Since you referred to 250.66, a #2AL would be correct for the minimum service neutral and grounding electrode conductor.

 

[Dennis Alwon]

250.102(C) has nothing to do with the equipment grounding conductor. T. 250.122 is what is used. 250.102(C) is for the bonding jumpers and the minimum grounded conductor-- this is virtually the same as T. 250.66

 

[JDB3]

These would be from an existing disconnect on the pole, underground to panel inside structure.

So by Table 250.122 #4 Al. would do for the grounding conductor. Sorry! If there is 200 amp over-current at the disconnect (last time I was there I could not unlock padlock).