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-   -   Colored THHN: restrictions? (https://www.diychatroom.com/f18/colored-thhn-restrictions-52460/)

I_think_I_conduit 09-07-2009 07:31 AM

Colored THHN: restrictions?
 
Hey, if I run out of one color of THHN, is there any restriction on what color I use as long as I tape/mark it?


I have plenty of white wire left but do not want to buy any more black.

My understanding is that I can use any color at any time as long as I tape it or use a marker (any color but green).


Is that correct?

Scuba_Dave 09-07-2009 07:56 AM

No, not when running small single wires
Black must be black, white white, green green
Anything smaller then #4 can't be remarked

On romex you can remark the white black for a switch loop




AllanJ 09-07-2009 08:05 AM

Any color for small wires refers to hot wires only and you can use any color besides white or green. You can also mark hot wires with additional color tags (besides white and green) to make it easier to identify which circuits are which.

AndrewF 09-07-2009 08:46 AM

but you cannot use/mark a white/neutral for another hot.

Speedy Petey 09-07-2009 08:59 AM

Quote:

Originally Posted by AndrewF (Post 324765)
but you cannot use/mark a white/neutral for another hot.

Well, in cable you can. :thumbsup:

I_think_I_conduit 09-07-2009 08:59 AM

REALLY. I always assumed I could tape white wire with colored tape.

I understand "shoulds". But my question is about code.

Scuba_Dave 09-07-2009 09:14 AM

Code says NO to remarking white or green as a hot
There are different colors as hot, but I've never used anything but red or black

No-one said anything about "should"




EBFD6 09-07-2009 09:34 AM

Quote:

Originally Posted by I_think_I_conduit (Post 324770)
REALLY. I always assumed I could tape white wire with colored tape.

I understand "shoulds". But my question is about code.


As others have said, it is against code. You absolutely, positively, can not use a white wire for anything other than a neutral (grounded) conductor. Also you can not use a green wire for anything other than a ground (grounding) conductor. The only exception for this, as Speedy said, is in a multi conductor cable assembly, but if you are pulling separate conductors in conduit, then no.

Those two colors are the only specific colors that the code restricts (well there are a few other instances, but nothing you would ever need in residential wiring). You can use any other color you want for the hot conductors.

Industry standards are black, red, blue for 120/208/240 volts, and brown, orange, yellow for 277/480 volts, but those are not governed by code only standard industry practices.

I_think_I_conduit 09-07-2009 11:37 AM

ok ok....i believe you.

BUT, I can tape black wire with white? or does that only apply to service?

EBFD6 09-07-2009 11:50 AM

Quote:

Originally Posted by I_think_I_conduit (Post 324861)
ok ok....i believe you.

BUT, I can tape black wire with white? or does that only apply to service?

Only #4 awg and larger. Any wire #6 awg and smaller you must use the proper color insulation, they can not be re identified (except multi conductor cables) white for neutral, green/bare for ground, and whatever you choose for phase(hot) colors.

I_think_I_conduit 09-07-2009 11:51 AM

I really appreciate the clarification/info.


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