Floorboxs in Concrete

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C

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My boss wants to run EMT in poured concrete with set-screw fittings and says that the concrete is the support for the EMT and since it is less then 10 feet it does not need a strap. I always thought that we had to use compression fittings and the EMT still has to be supported. I have not done alot of concrete work, but I have always used compression and always supported the EMT within the 3' rule.
 
Many set screw couplings are listed as "concrete tight", but some only if they are wraped with tape. Conduit in concrete does not require any support other than what is required to hold the conduit in place while the conduit is poured.
Don
 
I agree with Don. When we use EMT in concrete we tie wire it to the rebar or wire mesh to keep it in place until the concrete is poured. Once it's embedded in the concrete it's supported.
 
It depends on the type of work. In some installations I would only use RMC. EMT and PVC would not survive the battering that it would take from the lathers, plumbers, steamfitters and concrete masons on a large job. On the last large slab we did, the masons used buggies to move the concrete and destroyed a few of our RMC stub ups by running them over. If you're fortunate to have someone watching the pour you may be able to hickey them back up before they're completely buried in the deck.
 
infinity said:
It depends on the type of work. In some installations I would only use RMC. EMT and PVC would not survive the battering that it would take from the lathers, plumbers, steamfitters and concrete masons on a large job. On the last large slab we did, the masons used buggies to move the concrete and destroyed a few of our RMC stub ups by running them over. If you're fortunate to have someone watching the pour you may be able to hickey them back up before they're completely buried in the deck.
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Isn`t that why there are slab saws and chipping hammers and change orders?
Most guys today don`t even know what a pipe hickey is.....A 90, thats a sweep and 2 couplings.Ok who here that does pvc slabs, bends there own 90`s so there are no couplngs in the slab where they exit it ?????I do.
 
allenwayne said:
Isn`t that why there are slab saws and chipping hammers and change orders?
Most guys today don`t even know what a pipe hickey is.....A 90, thats a sweep and 2 couplings.Ok who here that does pvc slabs, bends there own 90`s so there are no couplngs in the slab where they exit it ?????I do.
Click to expand...


Good luck getting a change order. The GC won't care if your stub ups are buried under the concrete. As you've said get out the chopping gun and destroy that nice new concrete.
 
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