Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register
  • Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
  • The final cut of TMC Podcast #27 is available now with topics time-stamped. We discussed: Consolidation in LiDAR manufacturers; Volvo EX90 shipping with LiDAR; FSD Beta Full Release in N.A.; FSD detecting autopilot cheats, Gwen Shotwell directly overseeing SpaceX Starship; and more. You can watch it now on YouTube. We should have it published to podcast networks shortly.

Do you need conduit for in wall 4-awg thhn?

Rocky_H

Well-Known Member
Feb 19, 2015
8,575
11,125
Boise, ID
Planning to install the wall charger soon and i'm planning on getting these (10' black and 10' red + 8gauge copper wire). Is it code to have those 3 wires inside a conduit which will be behind dry wall?
Well yes. You have to choose one or the other. It's not allowed to just put straight THHN or bare copper loose inside a wall. You have to either go with the NM-B cable, or you have to use conduit to put the individual wires in.

Freaking Chicago area is ridiculous. They just have a full-stop prohibition on using NM-B cable at all. Period. Absolutely everything must use full conduit everywhere, which is kind of dumb if you're just needing to put something straight down through a wall--that's what Romex is for.
 
Well yes. You have to choose one or the other. It's not allowed to just put straight THHN or bare copper loose inside a wall. You have to either go with the NM-B cable, or you have to use conduit to put the individual wires in.

Freaking Chicago area is ridiculous. They just have a full-stop prohibition on using NM-B cable at all. Period. Absolutely everything must use full conduit everywhere, which is kind of dumb if you're just needing to put something straight down through a wall--that's what Romex is for.
I think municipalities other than Chicago do not allow Romex wire runs as well. I know that NYC requires conduit.
 

Rocky_H

Well-Known Member
Feb 19, 2015
8,575
11,125
Boise, ID
6awg is only rated up to 55a
You're making it confusing by not fully specifying what you're talking about.
The topic of this thread is talking about separate wires in conduit, like THHN type. For that, the 6 awg wire gets to use the 75 degree C temperature rating, which is 65A, not 55A.


AWG6 same issue with 55a limit
You seem to be responding to the last item #4 in @Gauss Guzzler 's comment, when he then switches to suggesting 6 awg of the NM-B cable, known as Romex. Yes, that one does have the 55A limit, because it has to use the 60 degree C temperature rating. But's why he immediately specified only using that with a 40A charge limit on a 50A circuit, so it's still code compliant.
 

MP3Mike

Well-Known Member
Feb 1, 2016
19,870
49,672
Oregon
While not 4AWG there is some cool new stuff available... #6x3 that doesn't require conduit, is direct burial, sunlight restiant, AND uses the 75* rating in both dry and wet locations.

 
You're making it confusing by not fully specifying what you're talking about.
The topic of this thread is talking about separate wires in conduit, like THHN type. For that, the 6 awg wire gets to use the 75 degree C temperature rating, which is 65A, not 55A.



You seem to be responding to the last item #4 in @Gauss Guzzler 's comment, when he then switches to suggesting 6 awg of the NM-B cable, known as Romex. Yes, that one does have the 55A limit, because it has to use the 60 degree C temperature rating. But's why he immediately specified only using that with a 40A charge limit on a 50A circuit, so it's still code compliant.
Describes my setup exactly. 6/3 NM-B (Romex) connected to 50 amp breaker. Wall connector is set to 50 amp circuit which automatically selects 40amp max current.
 
  • Like
Reactions: Rocky_H
  • Like
Reactions: davewill
This thread is extremely confusing. To answer the OP directly without all these "other choice" options, you need the following:

2x - 6 gauge THHN wire, whatever length you need
1x - 10 gauge THHN wire, whatever length you need
1x - conduit, whatever length you need

Done. See links below as well:



Ok thanks, that's exactly what i needed
 
  • Like
Reactions: Jeremy3292

skuk

New Member
Oct 31, 2022
4
0
texas
This thread is extremely confusing. To answer the OP directly without all these "other choice" options, you need the following:

2x - 6 gauge THHN wire, whatever length you need
1x - 10 gauge THHN wire, whatever length you need
1x - conduit, whatever length you need

Done. See links below as well:


I agree we need inwall and outwall conduits. But Do we need conduit while running these wires in Attic?
 
Freaking Chicago area is ridiculous. They just have a full-stop prohibition on using NM-B cable at all. Period. Absolutely everything must use full conduit everywhere, which is kind of dumb if you're just needing to put something straight down through a wall--that's what Romex is for.
Maybe there was some problem with nails cutting Romex or fire issues?

What about using BX wires instead of Romex, and use conduits when visible, as it is fifficult to keep BX to stay in a straight line?
 

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top