PVC sechdule 80 or 40

[codequestion]

I have a job in which i like to use PVC but not sure which sechdule since from electric utilty to panel board goes underground and above ground outside in weather.

Can I install PVC sechdule 40 below ground and PVC sechdule 80 above ground ? Would that create problem?

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[mopowr steve]

That’s perfectly fine.
You may want to chamfer the edge of the sch80 to eleviate snagging wire as it transitions between schedules.
Also do you need to go schedule 80 if under a drive?

 

[DBoone]

I have a job in which i like to use PVC but not sure which sechdule since from electric utilty to panel board goes underground and above ground outside in weather.

Can I install PVC sechdule 40 below ground and PVC sechdule 80 above ground ? Would that create problem?

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40 below / 80 above

sounds good

 

[wirestu]

Schedule 80 Elbows with Schedule 40 PVC

Schedule 80 Elbows with Schedule 40 PVC

We ran into a project where the original installer used Schedule 40 PVC in the concrete encased duct bank and transitioned to Schedule 80 PVC elbows in the manholes.

The cables they installed were chaffed and damaged during the installation due to the differences in the interior dimensions of the conduit systems. We installed a snake in the conduit and the camera showed a sharp edge and rise at each transition from Schedule 40 to Schedule 80.

Is there any code or U/L listing that relates to using Schedule 40 with Schedule 80 conduit?

 

[electrofelon]

You asked basically the same question a short time ago

http://forums.mikeholt.com/showthread.php?t=189176

Basically there is no place (except possibly poles, see the other thread) where 80 is required.

 

[codequestion]

Yea but that thread went into poles leaving my question unanswered. I have light poles but my ground is size of football field with various panelboards mounted outdoor. Conduot does not need to be run poles. Cable come from underground conduit under poles but there are places that conduit come out from ground and poles is not one of those places.

NEC 352 exposed says to use sech 80 but not sure where in nec it states can go from sechdule 40 to 80 transition. Is it bad idea? Can I use sechdule 40 pvc listed by manufacturer to be used above and below ground use?


I have 200 amps feeder breaker feeding led lights so you can tell biggest wire size.



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[codequestion]

That’s perfectly fine.
You may want to chamfer the edge of the sch80 to eleviate snagging wire as it transitions between schedules.
Also do you need to go schedule 80 if under a drive?

Above ground sech 80 pvc outdoor exposed to weather using 80.

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[ActionDave]

We ran into a project where the original installer used Schedule 40 PVC in the concrete encased duct bank and transitioned to Schedule 80 PVC elbows in the manholes.

The cables they installed were chaffed and damaged during the installation due to the differences in the interior dimensions of the conduit systems. We installed a snake in the conduit and the camera showed a sharp edge and rise at each transition from Schedule 40 to Schedule 80.

Is there any code or U/L listing that relates to using Schedule 40 with Schedule 80 conduit?

Switching from 40 underground to 80 above ground is the norm here, I've done it hundreds of times and never had a problem like you describe.

 

[roger]

Switching from 40 underground to 80 above ground is the norm here, I've done it hundreds of times and never had a problem like you describe.

Same here, not saying it doesn't happen but I have never seen it in my experience.

Roger

 

[codequestion]

Switching from 40 underground to 80 above ground is the norm here, I've done it hundreds of times and never had a problem like you describe.

Maybe conduit size for 80 is calculated assuming it is 40 and so conduit is smaller causing snag?

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[codequestion]

So here is my question: above ground and not exposed to physical damage areas can I use PVC sechdule 40 or I have to use sechdule 80 PVC?

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[electrofelon]

So here is my question: above ground outdoor and not exposed to physical damage areas can I use PVC sechdule 40 or I have to use sechdule 80 PVC?


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Schedule 40 is fine. Around here 40 is used above ground all the time, unless it's a job spec.

 

[tkb]

Where you come out of the ground you will need an expansion coupling for ground movement.

 

[LarryFine]

So here is my question: above ground and not exposed to physical damage areas can I use PVC sechdule 40 or I have to use sechdule 80 PVC?

Generally speaking, sch. 40n where EMT is suitable, sch. 80 where you'd need RMC.

 

[codequestion]

Schedule 40 is fine. Around here 40 is used above ground all the time, unless it's a job spec.

I am tryung to design and was wondering if i have sech 40 undergnd what can i put above gnd pvc. I guess i am specing it as for undergnd and above gnd sech 40. Where subject to physical damage and above gnd exposed a listed pvc conduit to use and let the contrqctor handle this. I dont want snage going from pvc 40 to 80.

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[david]

You asked basically the same question a short time ago

http://forums.mikeholt.com/showthread.php?t=189176

Basically there is no place (except possibly poles, see the other thread) where 80 is required.

And a few other places like health care facilities when used on the critical branch.

 

[steve66]

To sum it up: You can use schedule 40 or 80 underground or outside, and sometimes even inside. Its all in the NEC article 352.

The NEC only requires schedule 80 in a few places - mostly where exposed to physical damage. That's in the NEC 352.10 (F). You said that doesn't apply.

So you can spec. all schedule 40, or if you wanted extra protection above ground you could make that schedule 80.

Maybe you are confused because the NEC doesn't really mention much about schedule 40 or 80.

If you don't have the NEC handbook, I would highly recommend it. Even a used older one off amazon would be very helpful.

 

[codequestion]

To sum it up: You can use schedule 40 or 80 underground or outside, and sometimes even inside. Its all in the NEC article 352.

The NEC only requires schedule 80 in a few places - mostly where exposed to physical damage. That's in the NEC 352.10 (F). You said that doesn't apply.

So you can spec. all schedule 40, or if you wanted extra protection above ground you could make that schedule 80.

Maybe you are confused because the NEC doesn't really mention much about schedule 40 or 80.

If you don't have the NEC handbook, I would highly recommend it. Even a used older one off amazon would be very helpful.

Oh i dont know if outdoor exposed locations are subject to physical damage ir not. Some cases may not be depends how you install and where install.

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[user 100]

Oh i dont know if outdoor exposed locations are subject to physical damage ir not. Some cases may not be depends how you install and where install.

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If you'll notice, there is no ART 100 def for "subject to physical damage".......

The reason (and a very good reason at that) is b/c there are just too many variables/opinions- its open ended.

The best that can be done is to use your best judgement and/or to ask the AHJ--- a.k.a the "be all, end all".

If you want opinions here, just describe the circumstances ( like moving objects, anything sharp/blowing...etc near the pipe/cable) to the best of your abilities.

 

[codequestion]

Can anyone tell me whwre in code it says conductors or feeders sahll be protected from physical damage due to transition form 40 to 80 snag?


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