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#20314 - 01/13/03 04:37 PM Places of Assembly  
mvrandazzo  Offline
Member
Joined: May 2002
Posts: 110
We are presently building a new church auditorium. Before the floor is poured I want to run a few raceways to various locations to ease in the distribution of branch circuits. The ceiling height will be 22' at its' highest and I don't want to feed overhead unless I have to. If I interpet the code correctly, non-metalic raceways are permited in Art. 520-5(a) as long as it is encased in at least 2" of concrete. What I cannot find is how much exposed PVC is permitted to be stubbed inside a wall before converting to metalic conduit, if it is permitted at all? Or do most of you just stick with GRC?

My second question is if I use GRC I don't have access to a pipe threader. How dependable are the compression type of GRC connectors. Most of my experience has been residential so I don't have a chance to work with rigid that often.

Happy New Year to All and Thanks,
Mark


Work Gear for Electricians and the Trades

#20315 - 01/13/03 05:30 PM Re: Places of Assembly  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
MV:
Don't you have any plans for the job?? (by an architect or PE)

My 2 cents, as I don't know your location.
The PVC should be OK within the floor, and a "reasonable" stub-up, and then convert to required conduit.

RGS couplings & connectors are available in compression and set-screw, and we have had no problems with them, when we use them. A threader could be a good investment, there are a few "manual" ones available for <$400.00, and don't forget the tri-stand.

Best suggestion, before you get into the job/bid, talk to the AHJ. Or, talk to the architect/engineer.

John


John

#20316 - 01/13/03 05:33 PM Re: Places of Assembly  
txsparky  Offline
Member
Joined: May 2001
Posts: 552
Magnolia,.Texas U.S.A.
The engineers (in my area) require RGC stubbed up through the slab and from there we will change over to emt.
On the other hand,you should be able to rent a threader at just about any tool rental co.


Donnie

#20317 - 01/13/03 07:42 PM Re: Places of Assembly  
arseegee  Offline
Member
Joined: Jan 2002
Posts: 324
Statesboro, GA USA
Talk with inspector and fire marshall. If it's of non rated construction then it does not matter what you use. If fire rated construction, PVC is allowed if wall provides at least a 15 minute thermal barrier. 518-4c(1) Sorry, from 99 code, new book at shop.


#20318 - 01/13/03 09:51 PM Re: Places of Assembly  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Where I am we would run 3/4" and 1" PVC for branch circuits, better to run more small pipes then larger pipe that you fill and have to distribute from that point, better for derating too. (Don't forget derating)

This small pvc can make some good smooth curves without a hotbox or prefab bends.

If you put a 45 or 90 degree sweep in the middle of the PVC run (try to avoid this) and where you stub up use a GRC parts.

We use EMT if its in the wall, or if on the surface of the wall we go up 10' with GRC

Put pull strings or true tape in before the concrete goes down.

Never leave ends of pipe open, it is surprising what can end up in the pipe. [Linked Image]

If you keep it to these small sizes you should be able to do it with out much investment for tools.

As already said talk to AHJ


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#20319 - 01/13/03 11:50 PM Re: Places of Assembly  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I would add we never come up thru cement with PVC even a 2" PVC Sch 40 I can break off with my linemens right at the cement, even if we are coming up in the wall, to much chance of it getting broken before wall is in. If its a 22 foot high space you can count on self propeled lifts driving into your stub ups. If it is GRC it might dent but can be saved.


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#20320 - 01/14/03 12:32 AM Re: Places of Assembly  
Nick  Offline
Member
Joined: Aug 2001
Posts: 599
Riverside, CA
You have the right idea about places of assembly. No PVC is allowed above ground. An inexpensive way to solve this is install a PVC FA, or GRC coupling if you prefer, flush with finished floor. When the walls are up and you are ready to rough, screw an EMT connector in and take off.


#20321 - 01/14/03 01:49 AM Re: Places of Assembly  
nesparky  Offline
Member
Joined: Jun 2001
Posts: 642
omaha,ne
Another suggestion is to use a rigid 90 and a 12" nipple for your stub ups. I have used this with a pvc FA in the ground and a RGS coupling and plug onthe top of the nipple. 12" nipples are in most supply houses.


ed


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