Either I have had the same inspector, or they both attended the same seminar.
I couldn't believe what I was hearing, and when I laughed and told him he was crazy, it did not endear me to him much.
Soare's Book on Grounding (8th Edition, pp129) has a report on a test conducted on conduit fittings and locknuts.
"Conduit Fitting Ground-Fault Current Withstand Capability" , issued by UL, 6/1/1992
In a nutshell,[my paraphrasing] of Over 300 assemblies tested, from 10 manufacturers, 7 were deemed as insufficient. Yes, 6 were EMT fittings with zinc die cast locknuts without serrations installed on painted surfaces.
(an example of the test, 3/4" fittings were subjected to 1530 amps for a 6 second period).
The conclusion made--
"5. As a result of the tests, it was observed that if the fitting provides good electrical contact to both the enclosure and the conduit, the fitting will provide a suitable equipment path for fault current."
Good enough for me unless it's been superceded
My Mickey Mouse inspector wanted grounding locknuts, bonding bushings, or Myers hubs for all the EMT fittings. He wouldn't write it up when I asked him to. I just made sure that there was no paint under the locknuts, and left it.
I think the TI electrical contractor told me that he wanted them on the 4-S boxes, too.
He also wouldn't final the building shell because I had a bad light bulb.
It prompted me to (of course) bring it to ECN http://electrical-contractor.net/ubb/Forum5/HTML/000678.html
I think he needs to get his money back for the seminar.
PS, sandsnow, I do mostly service & warranty, & small TI's. We've not been "formally introduced". My last trip into your town was to advise the girls at your new Chamber of Commerce office (our company did the work) to just leave the occ sensors alone. They were trying to use them like the wall switches in their homes, with "frustrating" results
(& I know some old AJS guys)
[This message has been edited by electure (edited 11-17-2004).]