Code Check - PVC Conduit Concealed in Wall?

[2Big2Ride]

Just want to confirm code from the pros. Have 1" PVC conduit (schedule 40) roughed in through concrete slab to feed in-floor boxes that will contain receptacles. Need to connect the conduit stub to the panel. Can I complete the conduit run with PVC or do I need to transition from PVC to EMT to the panel. This section will be concealed in wood framed wall covered with 1/2" drywall.

Most of the Internet searches come up with this type of answer: "...PVC conduit can be concealed within walls, floors, or ceilings; directly buried; or embedded in concrete in buildings of any height....and...PVC conduit Schedule 40 for use in exposed areas not subject to physical damage where the raceway is identified for the application."

 

[ddawg16]

Your good to go.

I used 1.5" conduit to run wires from my new box to the original ckts in the original part of the house.

 

[Aceman]

You're fine. It's done all the time.

 

[madosta]

Just do note that exposed larger EMT is more manlier, that's really it.

 

[slimpickins]

Disclaimer ... I'm not an electrician but I know and follow code for my area. First thing is you have to know the code for your area because it can be different.

In my area, once you come out of the concrete with the conduit and you're inside the wood frame wall, (and assuming there are no environmental issues such as water exposure, etc.) then you just exit the conduit and run the loomex/romex to the box - no conduit required.

Note that you have to secure the wire to the stud framing within 12 inches of exiting the conduit, then run the wire in the wood frame as usual. Also be sure to debur the end of the conduit so it doesn't chafe the wire. We don't require any kind of bushing on the end of sched 40, but not so if you're using EMT. On EMT you need to have a bushing to protect the wire where it exits the EMT.

Again this is where codes could be different in your area. Check with a local electrician.

 

[2Big2Ride]

...snip
In my area, once you come out of the concrete with the conduit and you're inside the wood frame wall, (and assuming there are no environmental issues such as water exposure, etc.) then you just exit the conduit and run the loomex/romex to the box - no conduit required.
snip...

Using THHN/THWN 12g, solid wire so it has to be conduit box to box. No NM cable is, or will be, installed in the building.

 

[2Big2Ride]

Just do note that exposed larger EMT is more manlier, that's really it.

I have that handled! There is some exposed EMT. Found I really enjoy bending conduit - kind of like making the puzzle pieces as you work the puzzle.

 

[Speedy Petey]

No NM cable is, or will be, installed in the building.

Any reason for this??

 

[2Big2Ride]

Any reason for this??

Great question with not so great answers.

- Metal building - assumed you couldn't use NM in a metal building [key word, assumed]
- Electrician's helper that installed panel and meter base said I needed to use EMT or MC in a metal building [seemed to confirm the assumption]
- Ran EMT from panel to far side of the building to the first metal box, just seemed better to run MC than NM from metal boxes to metal boxes. Used metal boxes for all switches and recepticals. ...except for the floor boxes in concrete.
- Once MC was used wanted to stick with the same cable and not introduce NM in the mix. ...plus used up what I already purchased.
- MC is all concealed, except for runs in the ceilings to feed lights and ceiling fans.
- Used EMT for circuits that might need to be switched from 120V, 20A to 240V in the future. Like the dust collector.

 

[Speedy Petey]

Great question with not so great answers.

- Metal building - assumed you couldn't use NM in a metal building [key word, assumed]
- Electrician's helper that installed panel and meter base said I needed to use EMT or MC in a metal building [seemed to confirm the assumption]
- Ran EMT from panel to far side of the building to the first metal box, just seemed better to run MC than NM from metal boxes to metal boxes. Used metal boxes for all switches and recepticals. ...except for the floor boxes in concrete.
- Once MC was used wanted to stick with the same cable and not introduce NM in the mix. ...plus used up what I already purchased.
- MC is all concealed, except for runs in the ceilings to feed lights and ceiling fans.
- Used EMT for circuits that might need to be switched from 120V, 20A to 240V in the future. Like the dust collector.

No, no. These are fine answers. Almost all very valid reasons. 'Cept for the assumption part.
It's fine running NM in a metal framed building, but obviously precautions must be taken. In the end it's usually just easier to use MC/conduit.

 

[dirtydogintex]

MC/conduit resists rodent gnawing much better than NM.... even in residential structures

 

[Speedy Petey]

MC/conduit resists rodent gnawing much better than NM.... even in residential structures

Most of the stuff in NYC is rigid. What does that tell you about their rodents?