This is a repost from my Original site, SparkyUonline.com
After 30 years in the electrical industry, I know these colors without thinking about them while wiring an electrical panel. Most seasoned electricians know this as well; however, I still run across journeymen and apprentices that struggle with getting the colors correct. It sucks when you go to make up a panel, and ckt 32 was pulled in blue, and 30 was blk. It makes the panel look like someone screwed up the correct phasing related to neutrals.
I highlighted “most” because I know people that have been in our industry for ten years and still can’t mark the wires correct!!
I have had many electricians ask how I know which color matches which number-and this is what I show them.
You can copy and print these charts if you’re an electrical contractor or an apprentice electrician.
Hang them up while wiring a panel for quick reference.
Downsize them and laminate them for use next to a wire cart.
Note that these are for Commercial applications. Residential charts vary due to the amount of three wire home runs you have.
