10-2, 8-2, and 6-2 NM Cable with black/red?

jeff48356

Senior Member
Do they make 10-2, 8-2, and 6-2 NM cable with black and red conductors, rather than black and white? This would actually make a lot more sense if they did, since there are no 120V loads above 20A, thus they wouldn't need a neutral wire. In fact, I don't know why they even make 30A single-pole breakers. With that being said, are we still required to re-identify the white wire as a hot when using 10-2 and larger NM cables? I always do with 14-2 and 12-2, but never with 10 or larger.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Do they make 10-2, 8-2, and 6-2 NM cable with black and red conductors, rather than black and white? This would actually make a lot more sense if they did, since there are no 120V loads above 20A, thus they wouldn't need a neutral wire.
I believe it's available in Canada (I call it "DC Romex") and can be special-ordered here. Many 240v loads above 20a DO require a neutral. In a residence, the water heater and the HVAC are just about the only 240v-only loads.

In fact, I don't know why they even make 30A single-pole breakers. With that being said, are we still required to re-identify the white wire as a hot when using 10-2 and larger NM cables? I always do with 14-2 and 12-2, but never with 10 or larger.
A 30a 1P breaker might be needed to start a large 120v motor. Yes, any white wire that is not grounded is supposed to be re-identified, regardless of gauge.
 

Dennis Alwon

Moderator
Staff member
You always have to re-identify the white wire when it is a hot conductor. Yes, Canada in Canada you can get all sizes of nm cable with Black, Red and ground. Not available here--
 

Frank DuVal

Senior Member
I don't know why they even make 30A single-pole breakers
If they did not sell them, they would not contuinue to make them! So there is a use.:cool: They even make matching plugs and receptacles.;)
 

jeff48356

Senior Member
If they did not sell them, they would not contuinue to make them! So there is a use.:cool: They even make matching plugs and receptacles.;)
I can't think of any use for them other than 30A 120V RV receptacles at campsites. Also, some homes have one of these installed so they can keep their RV powered up.
 

MAC702

Senior Member
It's a good question. If the law doesn't require it, they aren't going to tool up to do it differently. And not as long as we're buying it and carrying Sharpies in our pockets. While there ARE 30A+ 120V applications, it's still a fact that 2-conductor cables with #10 and up are almost always being used on a 240V load.

Many 240v loads above 20a DO require a neutral. ....
In which case, it's a 3-conductor cable.
 

Hv&Lv

Senior Member
I get red/black two conductor 10 gauge cable from a supplier here in NC, but I use it for DC.
I believe a change in the 2017 will allow it to be used for your application if the manufacturer marks it with an additional “JP” for joist pull. Like “TC-ER-JP”
 
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