hp transformer electrical wire color code chart

In the NFPA world all power circuits use black wires. Sure you still can do what you want but you will need to add a label to the inside of the cabinet warning folks and now your panel has a mash-up of wire colors. but in the place I used to work we used BRN, ORG, YEL for 480VAC and BLK, RED, BLU for 240VAC. A few years ago the standard also included Yellow but it appears that this has been removed in the current edition which also means the image at the top of the blog is out of date. In most cases this will also require special labels on the enclosure door and other considerations. This is one that I have used for ESTOPS that travel from panel to panel. Grounded AC Conductor: White with Orange Stripe I should also point out that Automation Direct has sold this wire for several years.Ĭonductors that remain energized when the main supply is disconnected. Most suppliers will simply load a spool of white MTW into a machine that paints whatever color stripe you want onto the wire. Just about any large wire supplier has the ability to provide you with this wire, even if its not on the website, just ask them. I have heard folks complain that this wire is hard to purchase or some other rubbish. Now I have seen this in many panels as blue with a white stripe but the standard actually says White with a Blue stripe. White, Gray, and one other that you really should read for yourself in the standard. I will direct your attention to section 13.2 which discusses this topic in detail which I will paraphrase here:Īnd of course there are several exceptions. As of this writing the most current edition of the NFPA 79 is edition 2018 and it gets updated every few years, you can even read the current edition online for FREE, so now you don’t have an excuse for not reading it!įor readers in the rest of the developed world you will want to refer to IEC 60445. This standard was derived from the NFPA 70 and is referenced in article 670. Here in the USA the most commonly used standard is the NFPA 79, this is an electrical standard for industrial machinery. Technically speaking you can use just about whatever color you want if you really want to.but why would you? News flash folks.there are national and international standards where this has all been discussed and decided years ago. It is 2020 and some panel designers here in the USA are still making up wire colors? Really? I know that this topic has been discussed in many other forums but I had a conversation with a customer recently that got my blood pressure up so I thought I would take a few moments to write a post and vent.

Hp transformer electrical wire color code chart