...Just going on my small collection of U.S electrical fittings, it seems one is required to understand the meaning of the different terminal colours which are not the same as the wiring colours.
Years ago, I worked in cost analysis for a major manufacturer. At one point, the question came up: did we really
need the plating colors on the terminal screws, inasmuch as the base of the device had molded-in directions (HOT-->, etc.). We never got a clear answer on that. I had the strong impression that nobody wanted to be the first to go there.
