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Richard, I think you are right, the weakest link in the chain was a compression fitting. Maybe one that was not properly tightened. An EMT connector will thread right into a RMC coupling and it doesn't look like it would interfere with the expansion joint motion, so I still think the expansion joint may be functional. It should slip with modest hand pressure. Wouldn't the installer notice if an expansion joint wouldn't work? And then not use it. it just wouldn't make any sense to install it in if it didn't work. Kent Richard L Ratico wrote: Kent, I looked at the photo of that expansion coupling and initially thought, "That'll work". But.... if the conduit was RMC OR IMC all the joints would have been THREADED into couplings, and even if by mistake they were not wrench tight, they would not have pulled apart. Even if strapped too tightly, the roof blocks would probably pull over first. With EMT, contraction pulled apart the weakest link in the chain, a loose slip fitting.Thanks William. Dick Solarwind Electric --- You wrote: 2) The expansion joint fabricated from adapters for different conduit systems probably works fine and may not have been a contributing factor to this fire, but it is prominently visible in the report. --- end of quote --- _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org |
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