Hi All, I upgraded a 100A main to a 200A main. Then installed a 100A sub-panel in a garage (40 ft. away). The Inspector say I have to add a main breaker in the sub panel even though I put a 100A CB in the Main panel feeding the sub. He also wants me to add a separate ground system and add a bushing on the conduit coming into the sub panel even though the conduit is PVC. I thought if I install another ground at the garage it would have to be bonded to the ufer at the house. Any thoughts? Eric
One of the better ones- Electricians do it without shorts.
Only if you have more than 6 breakers. I'm telling you, here they do not make you put one. I have run a #2 SER all the way across a crawl space to the other side of the house to then go underground another 60' to the garage and then terminate at a 100A ML panel.
I spliced the SER with mechanical lugs in a "J" box and then ran just 3 - #2 URD alum conductors UG to the garage and then grounded the service there.
This is not a seperately derived system and according to this particular county inspector, a main was not needed. Afterall, it is already protected for short and overload at its MB. So, if you have less than 6 breakers in that garage panel you are good (around these parts anyway). :~)
Re: Sub Panel question#42147 09/16/0407:41 PM09/16/0407:41 PM
It's been awhile since my exam, but you need a plastic bushing on any pipe where the conductors are larger than a #4 (I think). It would be easy enough to find out by going to the book. I use PB's on all services. Bonding bushings of course are not required on pvc. I seldom need to use bonding bushings in my work but I've needed them in the past on bigger jobs on conduits carrying a grounding electrode conductor (both ends must get bonded), or on seperately derived systems like transformers when you go to bond the neutral, or..... I could go on and on I suppose.....
We also used to use IMC sweeps on PVC UG pipe runs so the rope or pull string wouldn't cut into the PVC sweep and then you have to bond that sweep (obviously if you think about it) and a bonding bushing is the easiest method.