Capping EMT conduit


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Old 08-31-15, 12:15 PM
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Capping EMT conduit

I need to cap an EMT conduit.

I have eliminated one circuit so I remove the EMT conduit run all the way from the panel to the ceiling box.

When I got to the ceiling box my intent was to remove the set screw connector, and close the 1/2" KO hole with a KO seal. Simple.

Only problem is I found out the locknut on the inside of the 4" square metal box was pit on cockeye and messed up the threads. I am not going to be able to back it out with a round mud ring mudded in and existing wiring inside. I will have to leave the connector in place.

I guess I can connect to it a short piece of EMT conduit? Then to the other end a set screw box connector...if I remove the locknut from the connector, will I be able to put a standard 1/2" threaded pvc cap for plumbing over it?

So the fundamental question is, will a standard 1/2" NPT PVC female cap thread nicely onto the male threads of a 1/2" EMT connector?

Or is there an easier way to cap it?
 
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Old 08-31-15, 03:03 PM
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Is the box going to stay in place? If so I would just leave everything in place and just remove the wires. An extra pipe is never a bad thing.
 
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Old 08-31-15, 03:49 PM
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Can't do that as I already ripped out the pipes from one end to the other and this is the last segment of it. Yes the box will stay in place.
 
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Old 08-31-15, 07:19 PM
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Bent nose pliers may help twist the locknut off.
 
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Old 08-31-15, 07:31 PM
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problem is access.

It is a 4" square box with a round 3.5" mud ring that cannot be removed (well not unless I chip out all the mud around it), and the connector is at a corner. I can get a plier through that mud ring and have enough of a grab to twist it off.
 
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Old 08-31-15, 08:17 PM
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I'm feeling a bit dumb. I have never heard of capping off a conduit and not sure why you would. If it is for fire safety why not cut the wires as short as possible and fill the conduit with fire stop caulk?
 
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Old 08-31-15, 09:19 PM
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Ray, there is no wire inside. It's just a connector that can't be removed due to a "stuck" lock nut on the threads.

I guess I am thinking I need to somehow seal it the same reason you would seal a KO hole in a junction box.

They do make an end cap for it, but it's not available at big box stores.



So I was just thinking the way I can do this is to cut a real short piece of conduit, cap it with a set screw connector WITHOUT the lock nut, and put a 1/2" PVC threaded cap over it.
 
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Old 08-31-15, 09:51 PM
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Why not just seal it with fire stop caulk.
 
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Old 09-01-15, 07:04 AM
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Seems reasonable. If you're not pulling wires into it, is it really a conduit? I don't think there's any code implication. Hammering it flat seems fair too.
 
 

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