ECN Forum Forums General Topics of the Trade General Discussion Area Sub Panel question

CJS a you are correct that raceways with conductors larger than 4 AWG need a bushing that is 300.4(F) in the 2002.

However if you go to Article 352 you will find 352.46 requires a plastic bushing on all PVC regardless of wire size.

The bonding of a metal sweep in a PVC raceway is not needed if it is below ground. (250.80 Exception)

If it is exposed but goes into a metal enclosure with two lock nuts it will not need bonding bushings unless it has service conductors in it or is using concentric KOs not listed for the purpose and is has conductors operating over 250 volts to ground. (250.97)

Hi Bob...352.46 seems like a little overkill to require bushings on PVC...bushing manufacturers musta lobbied for that rule

shortcircuit

Thanks for all of your replies. I had a little trouble finding some of the articles and the 1999 book (contains all my notes etc.)I was using has a different article for 352.46 than the 2002. normally I put a sub feed lug in the main and a main breaker in the sub panel. The bushing was a stupid oversight but since the conduit was PVC I didn't think much of it. There are exceptions for the main breaker or disconnect which probably don't apply to me but it looks like I'll be installing another sub panel.

iwire:
I never said that bushings are not required on PVC; I said that bonding bushings are not required EVER on PVC.

And, yes, IMC sweeps must be grounded when above ground (any portion of them), or if you come up with metallic raceway.

Alot of electrical work is common sense.

:~)

The Garage is a Completely Separate Building Structure. You MUST have a Disconnect coming in. The GROUND BAR, is so that you don't have half of current flowing into the NEUTRAL and the GROUND WIRE all the way into the house. Or perhaps in a CIRCULAR MOTION. You also have to keep SEPARATED THE GROUND AND NEUTRAL BARS. in the Subpanel for the same reazon. You don't want the Ground wire to have electricity going back in the house. The Bushing is to protect the conductors, when you FIRST run the wire in. Have a Nice Day.