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Richard,<br>
<br>
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.<br>
<br>
Kent<br>
<br>
<br>
Richard L Ratico wrote:
<blockquote cite="mid:117903130@retriever.VALLEY.NET" type="cite">
<pre wrap="">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 ---
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