Ron if this is a circuit over 250v. to ground then it might be a violation. 250.97 If this is a Service raceway and this is the method of bonding then it might be a violation. 250.92 Your not giving us much information. I don't think it's a good installations but I've seen it done and can't really argue that it's not "effectively bonded" based on my understanding of the term. In technical terms it's "pig work". You only have to bond one end of a raceway sometimes, even on Service raceways. Now what brings up this question?
Thanks George. I bring this up because I was on a job where this was done and I was concerned that the pipe was not properly bonded. IMO it's not. The guy who did it is one of these guys that can do no wrong no matter what you tell him and I've just given up trying. In my opinion it's a poor bond. I'm very concerned about the installation because the pipe feeds numerous pieces of commerical kitchen equipment (28 current-carrying conductors in all) and I'd hate to to later find out that someone died there because a ground fault did not clear when it should have. And because this job had no permits, there is no paper trail, and therefore no responsibility if a fatality occurs.
NEVER assume there's no paper trail. Just wait till something goes wrong and see how fast the owner comes up with the cancelled check that the contractor deposited into his business account. Not to mention anything the contractor wrote down on company letterhead. Put somebody in a hot enough seat and they come up with all kinds of interesting paperwork in order to save their own butt. You failed to mention whether a full size grounding conductor was installed in the conduit in question.
Re: 250.96 (A)#100303 11/12/0611:04 AM11/12/0611:04 AM
Chase nipples cannot provide proper bonding, as there is no way to "bite" into the enclosure (same reason why reducing washers cannot provide a bond). The threaded connection into the LB would be sufficient (if wrenchtight) for bonding the locknut to the LB, but not to bond the nipple or the LB to the enclosure. Locknuts do "bite". Sounds like either a green wire EGC bond would be required in this installation or replace the chase nipple with a close nipple and use two locknuts (and maybe a bushing).
BTW removing paint may lead to rust problems in the future. Always repaint over the bonded connection after it's all terminated and tightened.
Re: 250.96 (A)#100304 11/12/0611:26 AM11/12/0611:26 AM
Earlydean- While I support you professionalism and if I were installing the job I would not use chase nipples as this thread discribed them being used nor would I use reducing washers except where I had to for some unknown reason. While there are code reasons to not use these items for Service raceway bonding or over 250v. to ground, etc. the use of reducing washers and chase nipples is a code compliant installation and as an inspector we usually accept them when installed correctly.
Re: 250.96 (A)#100305 11/12/0611:58 AM11/12/0611:58 AM