Re: [CAD_CAM_EDM_DRO] FYI: Home Depot Good buy on conns/cables 20' 3Phase

>Depends if you are talking rules or convention. The green ground is an
>NEC rule.

Black, red, and blue for the phase wires is a common

>convention but is not required. All the code says is that they can't be
>white, gray, or green.

I have seen this convention often. I like to avoid it because blue is
often used for DC. As I understand it, you can use color tape to remark
white and grey wires to phase colors.

>One other rule is that the high leg of a grounded center tapped delta
>system must be orange. In that case the common convention is brown,
>orange, yellow.
>
>Four wire SO cord only comes in black, white, red, green, and the code
>has an exception allowing it's use on 3 phase. I like to put blue (or
>orange) tape on the white wire, though. It's a nice little reminder to a
>guy who might be about to replace the plug with the wrong kind.
>