Jan 14, 2007 · Type NM-B cable first began to be manufactured with color-coded jackets in 2001 to aid in identification of the conductor size. The color code that was introduced, which continues to be used today is as follows: 14 AWG – White 12 AWG – Yellow 10 AWG – Orange 8 AWG – Black 6 AWG – Black This...

Apr 29, 2020 · Does anyone know around what year romex changed from black to white sheathing? I know in 2001 ish when I was a second year apprentice 12 became yellow and 10 orange. 8 and 6 were black. I see a lot of black romex in remodel, not just the 1940s "rag wire" but modern style black sheathed romex.

Jan 16, 2021 · A lot depends if its the old style NM cable or the newest tyle NMB that came out in early in 1980's. The NMB insulation always appeared to be type THWN which in dry locations good for think 105 degrees C. Old style NM cable always appeared to be type TW insulation.

Sep 30, 2009 · I always thought 12/2 romex had a #12 ground and 14/2 had a #14 ground. I was told at a seminar that 12/2 has a #14 ground and 14/2 has a #16 ground. Is this correct? They look the same size to me and my strippers.

Mar 17, 2023 · What is the correct wire color coding in the US for a 240/480 Volt, Split Phase, 1 Phase, 3 Wire System according to the NEC Code.

Mar 9, 2018 · Hey guys. I know romex is nm-b but what temperature wire type is the actual conductor. Is it thh type for high heat? I know it doesn’t have a nylon jacket so it isn’t thhn. I think it derates at 90 degrees but wanted some expert input. Thanks.

Mar 9, 2022 · The purple color is part of a new color-coding system for Romex cables, which helps distinguish between 2 and 3 conductor cables: 14/2: White; 14/3: Blue; 12/2: Yellow; 12/3: Purple; 10/2: Orange; 10/3: Pink

Aug 6, 2014 · Please point me to an article stating I should only megger Romex at 500vdc. I regularly megger 480v motors and thhn at 1000vdc. With Romex rated at 600v just like thhn why would I test it any differently just because it only carries 120v or 240v in a dwelling? Obviously you can find problems at 1000vdc that don't seem like problems at 500vdc.

Nov 16, 2011 · Where can I buy 14-4 Romex cable? It would have a total of 5 conductors (black, white, red, blue, and ground). There are a lot of times where the extra blue wire would be helpful, such as running a hot, neutral, and two travelers in a 3-way and 4-way switch circuit. Home Depot sells a 250' roll of what they call 12-2-2, which also has 5 conductors.

Sep 17, 2015 · I need clarification between 2011 NEC 334.80 and 334.112. NEC 334.80 says to rate conductors at 60* C and 334.112 says 90* so long as the NM type cable is identified with a -B. Am I reading that right? This has come up several times when wiring 10K heat strips for instance with #6 NMC romex. At...