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#114018 - 12/08/02 02:41 AM Opinions requested  
Admin  Offline

Joined: Oct 2000
Posts: 3,447
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This is a "rescue" job. The 3/4" and 1" PVC stub ups were jacked out of square with the wall and some broken during the concrete pour. The inspector suggested this as the best option to salvage the installation.

Opinions/critique welcome.
- Fred

Tools for Electricians:

#114019 - 12/08/02 06:05 AM Re: Opinions requested  
pauluk  Offline
Joined: Aug 2001
Posts: 7,520
Norfolk, England
It would have been nice if the conduits extended neatly up to the gutter, but given the situation, I guess this makes the best of a bad job.

I'm just wondering if there could have been a way to put a deeper gutter down at floor level. ????

#114020 - 12/08/02 11:03 AM Re: Opinions requested  
Joe Tedesco  Offline
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
What type of fitting was used at the transition, and are they listed for this use? See 300.15.

I would also add support between the gutter and floor.

Joe Tedesco, NEC Consultant

#114021 - 12/08/02 12:33 PM Re: Opinions requested  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
You may have a derating issue if there are more than 30 current carrying conductors. See 366.7.
I think I would have looked at installing the gutter directly on top of the conduits comming out of the floor with the gutter opening up to make it easier to pull wire. If I did this I would try to make sure that the conduit beween the gutter and the panel did not exceed 24" to avoid additional derating.


#114022 - 12/08/02 01:45 PM Re: Opinions requested  
Fred  Offline
Joined: Apr 2001
Posts: 449
Straughn, IN 47387
The fittings are a PVC female adapter glued on the PVC with an EMT connector screwed in. De-rating is not a factor as each of these 3/4" conduits are for one set of conductors each. They are for dedicated circuits for special equipment and the 3/4" conduits will have (4)#10 THWN and the 1" will have (3) #8 and (1) #10 in it. All other conduits/circuits will be overhead runs. There are (2) more panels to be mounted above the gutter. The feeders from the 400A MDP will run through the gutter to DP1 and DP2. The panels and gutter are mounted on a wall with 1" OSB and (2) layers of 5/8" sheet rock between them and the stud faces. The EMT from the PVC to the gutter measures 26".

#114023 - 12/08/02 01:46 PM Re: Opinions requested  
CTwireman  Offline
Joined: Feb 2002
Posts: 840
Connecticut, USA
Isn't this PVC subject to physical damage?

Shouldn't the stub-ups be RMC? I don't think I've ever seen PVC stubbed up like this...always rigid.


#114024 - 12/08/02 01:51 PM Re: Opinions requested  
Fred  Offline
Joined: Apr 2001
Posts: 449
Straughn, IN 47387
Correction: The distance from the concrete to the bottom of the gutter is 26". The EMT length is 22".
Joe, can PVC transition to EMT using a PVC female adapter to an EMT connector? The inspector, who suggested this course of action, said it was an approved method and challenged me to show him where it wasn't.

#114025 - 12/08/02 02:40 PM Re: Opinions requested  
caselec  Offline
Joined: Apr 2002
Posts: 558
San Jose, CA
I probably would have used a larger gutter just to make pulling or feeding a little easier.
You should run a piece of strut behind the EMT.
I agree with CTwireman on the physical damage possibility of the PVC.


Curt Swartz

#114026 - 12/08/02 04:15 PM Re: Opinions requested  
Fred  Offline
Joined: Apr 2001
Posts: 449
Straughn, IN 47387
The equipment pictured is located in the garage/storage area of an animal clinic. What physical damage do you forsee the PVC being subject to?

#114027 - 12/08/02 06:39 PM Re: Opinions requested  
ElectricAL  Offline
Joined: Oct 2001
Posts: 597
Minneapolis, MN USA

Carlon lists their plastic female adapter
For adapting nonmetallic conduits to threaded fittings, metallic systems. Female threads on one end, socket end on other.

So, yes, the fitting is listed for use as the inspector claims.


[This message has been edited by ElectricAL (edited 12-08-2002).]

Al Hildenbrand

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