Colors for Ungrounded Conductors

ibarrola

Member
Location
Houston
Hi,
Did a quick search on the forum and could not find a topic on this (there probably is). I did see a post on control wiring today but could not find an answer.
I see standard industry guidelines for the different wiring colors for ungrounded conductors throughout articles on the web. And they mention this is per NEC but they do not reference a section of the code. Are the colors of ungrounded conductors part of the code?
I know county's and cities might have there own compliance for color coding but I am wondering if this come from code...

The city requires brown-yellow-purple, but a product we are purchasing has standard industry colors for 480/277V which is brown-orange-yellow. And I see the standard industry colors all over the articles I am finding.

Thanks you
yogi
 

ron

Senior Member
No standard colors for 480/277V in the NEC other than for an EGC and neutral (grounded conductor). The ungrounded conductors can be whatever you want as long as you identify them (or if the jurisdiction amended the national code)
 

tom baker

First Chief Moderator
Staff member
The NEC used to have required colors, but they were removed in the mid 70's. The comments were that you should not assume any color is any voltage and test to be sure. For example green could be used as a ungrounded conductor before the 2005 code. and at one time gray could of been a hot conductor.
There are required colors for neutrals, and EGC, in Art 200 and 250
What the code does say for building with more than one nominal voltage, choose colors, and post what you use. Example 120/208 could be pink yellow blue, but you have to use those throughout.
See see 210. 5 C 1 and a similar section in Art 215
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
Retired Electrical Engineer - Power Systems
No standard colors for 480/277V in the NEC other than for an EGC and neutral (grounded conductor). The ungrounded conductors can be whatever you want as long as you identify them (or if the jurisdiction amended the national code)
There are a few places in the NEC which require or recommend the use of 'orange' therefore some localities, such as yours, use purple as a common color instead.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Do the green/gray/white restrictions apply to control wiring, too?

The six small control conductors in a Generac system, for example.
 

Greentagger

Senior Member
Location
Texas
Occupation
Master Electrician, Electrical Inspector
Do the green/gray/white restrictions apply to control wiring, too?

The six small control conductors in a Generac system, for example.
Appears white or gray not covered if 50 V or less and not required to be grounded. 200.7(B). Doesn’t seem to be much wiggle room with green unless it complies with 250.119 Exception No.1.
 

Carultch

Senior Member
Location
Massachusetts
No standard colors for 480/277V in the NEC other than for an EGC and neutral (grounded conductor). The ungrounded conductors can be whatever you want as long as you identify them (or if the jurisdiction amended the national code)
Is there any set of colors that you'd recommend specifying for non-standard voltages in the US? E.g. 347/600V?
 
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