Steel elbows on pvc

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esox39

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I read it hear before, can't find it in the Archives.
Does it state in the book that steel elbows are required, knowing the because of the length of run, the bends can become damaged from the rope.
I have a long run of 2" PVC, 4 90's.
Thank you.
 
Re: Steel elbows on pvc

This is not a direct code requirement. The use of metalic 90's will keep the raceway intact as far as having holes in it from "burn through" and make your life easier in the way of not having to dig up the 90's and replace them to finish your pull when it comes to a stop, or find you have stripped the conductor insulation.

You can see what happens by wrapping your rope around the PVC and pulling it back and forth, you will watch it eventually cut through the PVC.

Usually the first and maybe second 90's at the feed end can be left in PVC, but the 90's at the middle and pulling end will be the problems.

Roger

[ March 07, 2005, 05:47 PM: Message edited by: roger ]
 
Re: Steel elbows on pvc

Comment withdrawn.

[ March 07, 2005, 08:15 PM: Message edited by: eesac ]
 
Re: Steel elbows on pvc

eesac, read the exception to 250.80 before we make the statement that all underground metalic tubing or conduit 90's need to be bonded.

Roger

[ March 07, 2005, 07:24 PM: Message edited by: roger ]
 
Re: Steel elbows on pvc

I usually install metallic elbows so that if fish-tape or small pulling rope is used it does not cut through the pvc elbow. If the pull rope is not too small 1/4" or less I only use the metallic elbow where the pull is done since the feed elbow will not have the pull rope in it very long. If your run is long and you have elbows at mid run, I think the metallic elbow would be good insurance. As far as grounding, if the elbow is isolated in the pvc run and located at least 18" below grade, the NEC does not require it to be grounded (250.86 Ex(3)).
 
Re: Steel elbows on pvc

Comment withdrawn.
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eesac, welcome to the forum! Please try to refrain from doing this. It makes threads harder to follow, and we all make a "stupid" statement every now and then. They generally lead to understanding, which is what I enjoy about this place. :)

[ March 07, 2005, 09:45 PM: Message edited by: georgestolz ]
 
Re: Steel elbows on pvc

As far as the NEC goes, the more I know the less I know. I learn every day from this forum.
 
Re: Steel elbows on pvc

Anyway, to ask a stupid question and be proud of it, how do you install a metal 90 in a PVC system? Special glue?
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You will need (2) transition fittings from PVC to male threaded end and (2) galv. couplings. The 1st galv. coupling fits onto the male threaded end then onto the 90 then onto the next galv. coupling then onto the next PVC male threaded end and back to the PVC. No special glue involved. However, although it's not a code requirement, in addition to gluing the PVC fittings I ususlly use the purple cleaner when burying large conduits to insure a good and tight bond.
 
Re: Steel elbows on pvc

We primarily use PVC Female Adapters, which thread onto the 90 and glue onto the pvc.

2 fittings instead of 4.
 
Re: Steel elbows on pvc

Thanks georgestolz, I didn't want to confuse anyone by misleading them. It is kinda embarrassing too, since being a PE, people ask "me" about Code interpretations all the time,..., I did learn something new though.

This is a great site, found it while waiting for jury duty reading ECM.
 
Re: Steel elbows on pvc

Eesac, no need to be embarrased, we all learn here.

Roger
 
Re: Steel elbows on pvc

The embarrassing lessons stick better. :D

There's guys so smart here, hang out for a while, you'll feel as stupid as I do. :D
 
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