EMT

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cowboyjwc

cowboyjwc

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I just want to see if everyone is in agreement. Connectors and couplings for EMT installed under a carport (open on all sides, with pitched roof) shall be compression type.
 
John compression tight does not mean wet location or damp location. They make rt connectors and couplings which happen to be compression type but not all compression fittings are WR. IMO, a set screw conn. is fine there if a compression connector is allowed but I am not sure how they are listed.
 
Dennis Alwon said:
John compression tight does not mean wet location or damp location. They make rt connectors and couplings which happen to be compression type but not all compression fittings are WR. IMO, a set screw conn. is fine there if a compression connector is allowed but I am not sure how they are listed.
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See my comment at #3.
 
Dennis Alwon said:
John compression tight does not mean wet location or damp location. They make rt connectors and couplings which happen to be compression type but not all compression fittings are WR. IMO, a set screw conn. is fine there if a compression connector is allowed but I am not sure how they are listed.
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I'm aware of that, should be the "blue" compression fittings. I was just trying to keep the question short and to the point.

If you look at 314.15 it says, "in damp or wet locations,........and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within........or fitting.........and fittings installed in wet locations shall be listed for use in wet locations.

So I know the first j-box is in a wet location (base of column) then it goes up to the underside of the roof and runs along there (damp location). So does it need to be a wet location fitting (blue) or can it be a compression fitting or even a set screw fitting?
 
I see no need for anything other than set screw connectors and couplings for EMT run on the underside of the roof.
 
cowboyjwc said:
I'm aware of that, should be the "blue" compression fittings. I was just trying to keep the question short and to the point.

If you look at 314.15 it says, "in damp or wet locations,........and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within........or fitting.........and fittings installed in wet locations shall be listed for use in wet locations.

So I know the first j-box is in a wet location (base of column) then it goes up to the underside of the roof and runs along there (damp location). So does it need to be a wet location fitting (blue) or can it be a compression fitting or even a set screw fitting?
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I'm not sure that for connectors there's a difference between "wet" and "damp", but I'm not staring at the white book right now.

Our inventory program has EMT set screw connectors as $0.59, compression at $1.01, and rain tight at $2.58, all for 1/2". If the carport is open on all sides, there's a good chance every fitting will, at one time or another, be subject to wind driven rain. My opinion, and worth every cent you're paying for it, is let the customer pay for the rain tights. One less potential call back to worry about. One less inspector to give you a hard time about it, come to think of it.
 
cowboyjwc said:
No it comes up one of the columns and then runs right below the peak to feed some lights.

Very ugly job. One run has eight 90's in it and everything is put together with set screw connectors.
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compression, rain tight. and some condulets.

no, strike that. you don't need any of that.
you need an electrician that knows what he's doing.

the home depot parking lot comes thru again!

it's ok... i have a conduit to fix that is about 400' long.
three 4/0 copper go down into the ground at the panel.
three #2 copper come up at the other end.

there is no junction box. musta been the same guy doing it.
he covers a lot of ground to get from newhall to lake forest....
 
The problem I have with rain-tight couplings for EMT in wet locations is the fact that rigid and IMC with threaded coupling let more water into the conduits than the standard compression EMT coupling ever did.

If the water ingress to the threaded conduits at the couplings is not a issue, why it is an issue with EMT?
 
gadfly56 said:
I'm not sure that for connectors there's a difference between "wet" and "damp", but I'm not staring at the white book right now.

Our inventory program has EMT set screw connectors as $0.59, compression at $1.01, and rain tight at $2.58, all for 1/2". If the carport is open on all sides, there's a good chance every fitting will, at one time or another, be subject to wind driven rain. My opinion, and worth every cent you're paying for it, is let the customer pay for the rain tights. One less potential call back to worry about. One less inspector to give you a hard time about it, come to think of it.
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Damn. I didn't realize that stupid green plastic ring was worth $1.57.

I use the RT fittings outside even if it's under the roof. But if I'm out of RT then will use setscrews under roofs.
 
don_resqcapt19 said:
I see no need for anything other than set screw connectors and couplings for EMT run on the underside of the roof.
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I agree. I've done large dairy barns that are nothing more than a steel building with just a roof, no walls, all in set screw emt connectors. I don't see what the issue is?
 
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