Bond GEC on both ends of conduit?

[mhulbert]

I installed the following yesterday, and was wondering if it is legal:
Ran 1/2" EMT from a panel down to ground rod and water pipe. It contains a #4 GEC for this structure. I used an EMT connector and a grounding bushing on the end that comes out by the ground rod. Other end of the EMT is just fastened to a non-concentric KO on the pnael, _no grounding bushing_, and the #4 terminates on the ground bus. Am I required to have a grounding bushing in the panel, and if so, do I need to connect the GEC to it, or will a short #4 jumper to the ground bar be suitable?

250.64(E) seems to apply to enclosures, not raceways, and I'm not sure if it refers to my situation or not. Normally I bond both ends, however I was out of 1/2" gorunding bushings. Am wondering if I need to go back and fix this install.

 

[infinity]

Re: Bond GEC on both ends of conduit?

The raceway needs bonding on both ends. A bonding locknut will work or a bonding bushing.

 

[dillon3c]

Re: Bond GEC on both ends of conduit?

250.64(E)Enclosure for GEC..
The bonding shall apply at each end and to all intervening ferrous raceways,boxes, and enclosures between the service equipment and the grounding electrode.

-The bonding jumper for a grounding electrode conductor raceway or cable armor shall be of the same size as, or larger than, the required enclosed grounding electrode conductor.

*Yes sir,I'd say a return trip,is in order..

 

[mc5w]

Re: Bond GEC on both ends of conduit?

When you put a GEC in a steel pipe you have to bond both ends. According to the IEEE Green Book mmost of any GEC current would flow over the outside of the steel pipe and you could cut the wire inside and not much would happen to the inpedance of the ground path.

I prefer using PVC conduit. If I am really worried about mechanical damage I can use Schedule 80 PVC, which has a crush resistance of 1 ton per foot.