PVC Duct Bank

[mstrlucky74]

if i have pvc conduits below grade that are stubbing up into the bottom of switchgear on grade would they transition to rgs or similar when stubbing into the gear. would imagine you cant stub up through grade slab and into gear with pvc. i know spec usually dictates but i was curious of others experience. thanks.

 

[Cow]

Do they let you do site visits to the jobs you bid?

A picture being worth a thousand words, a site visit and regular talks with foremen would be priceless in your situation.

To answer your question, stubbing up into gear with pvc is extremely common.

 

[cdslotz]

If the specs require it...why do you even ask?

 

[mstrlucky74]

Do they let you do site visits to the jobs you bid?

A picture being worth a thousand words, a site visit and regular talks with foremen would be priceless in your situation.

To answer your question, stubbing up into gear with pvc is extremely common.

Thanks thought one would never stub up into gear with PVC.

 

[cdslotz]

Thanks thought one would never stub up into gear with PVC.

Why?

 

[Cow]

Why?

Because he's an estimator with no field experience, apparently can't ask anyone on site, and he doesn't know his way around the NEC to look for himself?????

 

[mstrlucky74]

Because he's an estimator with no field experience, apparently can't ask anyone on site, and he doesn't know his way around the NEC to look for himself?????

niiiice

 

[mstrlucky74]

Why?

Because every spec I've read says no PVC within footprint of building...except this one.

 

[petersonra]

Because every spec I've read says no PVC within footprint of building...except this one.

You might be able to get some dispensation to stub UG PVC into floor mounted gear. maybe they would be more amenable to it if you agreed to use sch 80 where it pops up into the gear.

personally, unless it is a huge amount of money involved, I don't like asking for variations from the spec. I'd be inclined to just run the last few feet of conduit that goes into the gear as rigid.

most places though, there are conduits that come out of the floor and are exposed and I am not real thrilled with exposed and vulnerable PVC, even when it is in compliance with the code.

 

[don_resqcapt19]

Even if you are permitted to use a PVC 90, you have to take a look at the pull to see if it will be likely that the pull rope will cut though the PVC at the 90 and result in damaged conductors. If it will be a short easy pull, not an issue, but it is an issue on long difficult pulls.

 

[growler]

To answer your question, stubbing up into gear with pvc is extremely common.

Thanks thought one would never stub up into gear with PVC.

The PVC that sticking up through the concrete is not very much ( a connector & fiber bushing). The PVC is enclosed within the gear and not exposed to physical damage other than the pull it's self.

 

[mstrlucky74]

Even if you are permitted to use a PVC 90, you have to take a look at the pull to see if it will be likely that the pull rope will cut though the PVC at the 90 and result in damaged conductors. If it will be a short easy pull, not an issue, but it is an issue on long difficult pulls.

Thanks a lot...

 

[cdslotz]

The title of this post states this is a duct bank......a duct bank would be encased in concrete.

Is there a spec section about duct banks? A lot of them require long radius elbows...sometimes GRC and sometimes wrapped

 

[infinity]

Because every spec I've read says no PVC within footprint of building...except this one.

We use PVC with metallic elbows when penetrating the concrete.

 

[Kinexis]

if you agreed to use sch 80 where it pops up into the gear.

isn't schedule 80 smaller internal diameter, you might create an abrasion point in the conduit run mixing schedule 40 and 80. or have to put a huge chamfer on the 80 were it transitions