tryinghard
Senior Member
- Location
- California
Then in my opinion this generator's transfer switch needs to be treated the same as the main service disconnect, 250.24(A)(1) & 142(A) apply rather than 250.24(A)(5) & 142(B). Meaning it would be a non-SDS (702.10(B) & 250.20(D)) and the transfer switch shouldn?t operate the ungrounded conductor, all would bond at the transfer switch for the utility and generator circuits.
If I understand your post correctly the inspector wants a SDS (switched ungrounded conductor) for some unknown reason, if this is the case 250.20(D) requires the generator - ?alternate source? - to be the bonding location for that particular supply.
In summary one method bonds all at least at the transfer switch, and the other method bonds the utility at the service disconnect (transfer switch if service rated) with the generator bonded for the alternate source. For the life of me I cannot see what this gains compared to non-SDS in your case, I see no hazard to bond all at the transfer switch non-SDS?
