recommended ground size for 100A sub panel
Thanks guys, I appreciate the help.
I will step down to a 90Amp breaker. Funny thing here is I just pulled out 3-150' 4AWG conductors that were feeding a sub to a pole barn at our home that we are selling. The home was originally built by an electrician, and he had set it up with a 100A 11,000AIC breaker in the main service panel. Then the sub panel was a main breaker style that had a 100A 22,000AIC breaker.
I was hoping to use this sub panel but to do so the main breaker in the sub panel should be rated at 90A with a 11,000AIC or lower. Now the main breaker in the sub is totally different from a standard double pole branch circuit breaker right? I'm working with square D qo. If I do need different "main breaker" for the sub, can I find these at home centers, or should I check out Grainger or Graybar? Is it going to be cheaper to abandon the main breaker sub panel and just go buy a new main lug sub panel fed with a 90A DP at my main service panel?
Man, how come the pros sometimes cut corners if it's their own stuff, Makes me think of seeing the auto mechanics drivin' around with the 'ol rustbucket smoking and squeeling & held together with some duct tape and a few coat hangers.