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Captflx 04-03-2011 05:54 PM

Yellow Jacket Romex
Is the yellow jacket Romex only used with 20 ga. wire?
Does anyone know what year (approximate) the yelow jacket was first used in the U.S.?

nap 04-03-2011 06:00 PM

it is the color commonly used with 12 awg but there is no code so it is not a reliable means to determine the gage.

no idea when it started but since it is not a code requirement, it likely started with one manufacturer and was eventually picked up by all the major producers. That could have taken any number of years before the followers finally started doing it.

Thurman 04-03-2011 07:35 PM

Yes, to what Nap replied. But do now rely on color coding of the exterior sheathing of "Romex" (a brand name anyway) to determine the gauge of wiring. READ what is imprinted on the outer jacket, read it twice.

DangerMouse 04-03-2011 07:59 PM

Yup, it's printed all up and down the wire! (although that old black wire can be real hard to read when it's too old....)


junkcollector 04-03-2011 08:11 PM

About 2002 is when I started seeing yellow 12/2 NM.

Dahammer 04-03-2011 10:40 PM

Found a 250' roll of white jacketed 12/2 in my shop the other day. Had to do a double take to make sure it was 12/2. But yeah, it was in the early 2000s when they started that I think.

nap 04-03-2011 10:46 PM

did that have an undersized ground conductor?

Dahammer 04-03-2011 11:24 PM


Originally Posted by nap (Post 622751)
did that have an undersized ground conductor?

You know, I'm not sure, will have to look.

Nope, just looked and it's the same size. Would have been purchased around 1999, probably, when I added lights to the closets in a house I owned at the time.

kbsparky 04-03-2011 11:24 PM

Undersized grounding conductors are found in very OLD NM cables, dating back to before the 1971 NEC went into effect.

In Canada, their type NM-D cable still utilizes undersized grounding conductors ... a #14 ground is present in a #12 cable.

DangerMouse 04-04-2011 05:54 AM

I found/have/had some of that (with hard to read black sheathing.) I DID re-use some at the end of my wiring job here on 2 short switch runs, but I stripped out extra white and spray-painted it green and ran that as a ground to make sure the inspector did not fail me. He allowed it.


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