Randy Batchelor
New member
- Location
- Oakland, CA, USA
My company is investigating using a short section of LFMC (flex) in place of an expansion fitting to compensate for expansion and contraction of long runs of EMT conduit on Rooftops. The idea is that this will save cost. I'm not entirely supportive, but we have a few folks pushing the idea.
There are a few concerns:
- the LFMC might sag onto the roof. possible solution is to bend the EMT up a bit at the ends so the curve of the LFMC goes away from the roof, rather than sagging onto the roof
- the LFMC is difficult to bend and so it will build up pressure in the conduits and not releive the strain on the conduit and support system that the expansion fittings are meant to mitigate.
We had one of our subs build a little mock up with a 1" and 3" section. we are thinking it might be more feasible with the 1" because it's easier to bend...
Does anyone out there have experience with this? Thoughts?
Thanks,
There are a few concerns:
- the LFMC might sag onto the roof. possible solution is to bend the EMT up a bit at the ends so the curve of the LFMC goes away from the roof, rather than sagging onto the roof
- the LFMC is difficult to bend and so it will build up pressure in the conduits and not releive the strain on the conduit and support system that the expansion fittings are meant to mitigate.
We had one of our subs build a little mock up with a 1" and 3" section. we are thinking it might be more feasible with the 1" because it's easier to bend...
Does anyone out there have experience with this? Thoughts?
Thanks,