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.
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.
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.
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.
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.
DM
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