Strapping Conduit With Expansion Fitting

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jamesguy10

jamesguy10

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Amsterdam NY
Heres the situation- a 3/4" PVC conduit coming out of the ground , to an expansion sleeve, and then to a LB going into the building, the whole thing is about 30" out of the ground, the first 24" is about 1.5" away from the concrete foundation, the last 6" is a LB and about 2" of the expansion sleeve, Get the picture? I put in a bunch of these, the question is, do i need to strap these to the building in any way? I couldn't really do it because the the expansion fitting....
 
mdshunk said:
Use the "next size up" EMT strap. In other words, if it's 3/4" RNC, use a 1" EMT strap. That will let the RNC "slide" if it needs to, but still be secure.
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Marc, I hate to do this but I have to.
Is a 1' strap 'LISTED" for 3/4 RNC?
 
chris kennedy said:
Marc, I hate to do this but I have to.
Is a 1' strap 'LISTED" for 3/4 RNC?
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Straps are not required to be listed by any means, and a 1 foot strap is obviously way too big. The NEMA document says to use regular sized straps and leave them loose. Either way, you have the same result... a bit of slip. Using the next size up EMT strap, the slip is more "calibrated" from strap to strap versus just leaving them loose.
 
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mdshunk said:
Straps are not required to be listed by any means, and a 1 foot strap is obviously way too big.
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What? What are they UL listed for? Don't get me wrong here, if it's a safe install theres no red tag.


PS
A 1' strap works great in most applications.:grin:
 
chris kennedy said:
What? What are they UL listed for?
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Beats me. The NEC only requires them to be corrosion resistant if they're going to be used in wet places. I don't think anyone is making iron straps anymore, so pretty much every kind of strap is corrosion resistant now. I believe that some people mistakenly think that you have to use the crappy 2-hole PVC straps on RNC. I most often use 1-hole RMC straps or run it on strut.
 
Wow... .Someone got paid to type an article on how u.l. has protected us from bad christmas lights since 1903, Even know the topic was conduit hardware. There wasnt much to say i guess.....:confused:
 
mdshunk said:
Using the next size up EMT strap, the slip is more "calibrated" from strap to strap versus just leaving them loose.
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Marc I can not use EMT supports with PVC.

In my area that is a red tag. 352.6 / 110.3(B).
 
iwire said:
Marc I can not use EMT supports with PVC.

In my area that is a red tag. 352.6 / 110.3(B).
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That would frustrate me to no end... A overhead service supported with pvc straps is an accident waiting to happen... just my opinion of course...:smile:
 
stickboy1375 said:
That would frustrate me to no end... A overhead service supported with pvc straps is an accident waiting to happen... just my opinion of course...:smile:
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I think that a lot depends on the strap selection, it also seems to depend on the inspector. :roll:

But than again I don't like PVC above ground. :)

For me it's SE or RMC....no middle ground. :D

... just my opinion of course...:smile
 
jamesguy10 said:
Heres the situation- a 3/4" PVC conduit coming out of the ground , to an expansion sleeve, and then to a LB going into the building, the whole thing is about 30" out of the ground, the first 24" is about 1.5" away from the concrete foundation, the last 6" is a LB and about 2" of the expansion sleeve, Get the picture? I put in a bunch of these, the question is, do i need to strap these to the building in any way? I couldn't really do it because the the expansion fitting....
Click to expand...

Must be you're using the expansion fitting as a frost-movement sleeve, because I doubt that 24"-30" of 3/4 pvc would be subject to objectionable thermal expansion/contraction. I think I would place the sleeve at ground level where the conduit emerges and place the over-sized strap on the barrel which would allow movement in either direction. :)
 
iwire said:
I think that a lot depends on the strap selection, it also seems to depend on the inspector. :roll:

But than again I don't like PVC above ground. :)

For me it's SE or RMC....no middle ground. :D

... just my opinion of course...:smile
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Bob, if I had my way, I would not use pvc for overhead as well, looks like complete garbage...
 
Wow some people besides myself that hate exposed pvc :D . The only reason this is exposed is because its residential and only exposed for 30". Any thing else exposed resi or commercial i always use emt or rmc, nothing else. I have this sudden urge to start a thread for debating pvc vs. rms for commercial use...... Id like to hear others opinions, as i am a strict metal guy.... Maybe i will:roll:
 
jamesguy10 said:
Wow some people besides myself that hate exposed pvc :D . The only reason this is exposed is because its residential and only exposed for 30". Any thing else exposed resi or commercial i always use emt or rmc, nothing else. I have this sudden urge to start a thread for debating pvc vs. rms for commercial use...... Id like to hear others opinions, as i am a strict metal guy.... Maybe i will:roll:
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Don't try to install any metal conduit around the beach areas. The salt spray will ruin those metal pipes in short order.
 
I understand the beach thing, and how the salt would destroy pipes. I was talking in general, i would consider a beach a special application. Plus i never do work near beaches, because there is none around me :smile:
 
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