What's wrong with using black and white for 277?How many shops here use black/white/green MC cable for 277V lighting circuits
Roger
conductor color of same circuit
- Thread starter Sparky up north
- Start date
- Status
Roger
sparkyrick
Senior Member
- Location
- Appleton, Wi
Because........when you have two system voltages present, we are supposed to mark the panels with the system voltages and the corresponding colors used. 99.9999% of the time, black/white/green will correspond with 120/208 system voltages. So those 277V systems using black/white.green will be wrong.
So being that you are talking about a cable assembly you simply re-identify the black and white to whatever colors you need.
Roger
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Absolutely nothing is wrong with it as long as the conductors are somehow marked at every panel, device, and splice with something that distinguishes them from 120/240 or 208Y/120.
And that means of identification is suitably made public.
Oh yeah, and as long as the white is only used for a grounded conductor, so no 480 loads fed by it. Or reidentify the white since it is a cable.
sparkyrick
Senior Member
- Location
- Appleton, Wi
Yeah, but I bet nobody takes the time to do that at every switch box/j-box/light fixture whip.
Agreed but doesn't change anything as far as the code requirements and a qualified person wouldn't need it.
Roger
Absolutely nothing is wrong with it as long as the conductors are somehow marked at every panel, device, and splice with something that distinguishes them from 120/240 or 208Y/120.
And that means of identification is suitably made public.
Oh yeah, and as long as the white is only used for a grounded conductor, so no 480 loads fed by it. Or reidentify the white since it is a cable.
Correct.
Roger
sparkyrick
Senior Member
- Location
- Appleton, Wi
I'm a "qualified person" and I recently did a remodel that was done entirely in MC cable originally from day one. Trying to trace out existing circuits was a PITA, since all the cable used was of the 120/208 color variety and all buried in the walls or attic. No boxes were marked 120V or 277V, it was a complete crapshoot as to what voltage was inside the box, all using black/(red)/white/green.
So IOW's it's a safe bet that you wish they would have complied with all identification rules. :thumbsup:
Roger
sparkyrick
Senior Member
- Location
- Appleton, Wi
Ummmm yeah, you could say that! I spent quite some time tracing out what box had what circuit, trying to find the 277V lighting from the 120V receptacle boxes.
- Location
- Massachusetts
How many shops here use black/white/green MC cable for 277V lighting circuits
Every day.
We label the box covers, it is acceptable to the AHJ
And that means of identification is suitably made public.
Not sure why that keeps sticking out to you, an easy thing to comply with. The company had nice stickers made up with the company letterhead and the color code we use. We just stick them on the panel covers.
Russell Ensslin
Member
- Location
- Olivehurst California
424.35
424.35
Don't know if this applies to branches
424.35
1 120 V Yellow
2 208 V blue
3 240 V red
4 277 V brown
5 408 V orange
424.35
Don't know if this applies to branches
424.35
1 120 V Yellow
2 208 V blue
3 240 V red
4 277 V brown
5 408 V orange
- Location
- Massachusetts
Not at all.
- Location
- Illinois
- Occupation
- retired electrician
You can do that as long as you show the method of re-identification on the sheet at each panel that shows what methods are being used to identify the conductors as to phase and voltage.
- Status