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#93494 05/28/05 08:36 PM
Joined: Jun 2004
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I have been installing PVC underground to supply outdoor branch circuits. PVC makes for a speedy installation.

I have had some of this PVC damaged from impact, including SCH 80 where it emerges from ground.

I want to use a piece of ridged conduit only where it emerges from ground and change right back to PVC.

Does the code require this short section used for physical protection to be bonded to the grounding conductor of the branch circuit?

shortcircuit

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Yes.


Joe Tedesco, NEC Consultant
Joined: Mar 2005
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I can never find this code article when I need it, including now, but Joe is right. If you use a short piece of rigid in a run of PVC (some guys like to use rigid 90's including me) the only way it doesn't need bonding is to be 24" or more underground.

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See 250.80, Exception, and 250.86, Exception No. 3


Joe Tedesco, NEC Consultant
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Oops. 18".

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Can you drop a short sleeve of RMC over the PVC where it is subject to "severe" damage.


Greg Fretwell
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Greg- I like that idea of slipping a piece of RMC or IMC over the PVC. And you wouldn't even have to bond it [Linked Image]


George Little
Joined: Jun 2004
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gfretwell...I too, like that sleeve idea and will try it!

250.86 exception #2 allows short sections of metalic raceway to be ungrounded where used to protect cable assemblies...

So, if it where UF wire emerging from ground, then no bonding...

But, if the raceway encloses individual conductors for the branch circuit, then bonding is required...

Do we agree?

shortcircuit

Joined: Feb 2002
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I asked an EC for that same idea. He had an underground 400 amp service and where the pipe came up through the floor in the basement, he sleeve the PVC riser with Ridgid and he didn't have to worry about his kids ( or anyone else) hitting the PVC riser and cracking the pipe. I think this guy went even one better and stuck some concrete inside of the RMC.

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What is the advantage Of sleving the PVC with RMC compared to using only RMC at the stub up? I seen it specked out but just never seen any advantage.

Tom

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