I've got a few wiring projects lined up and some of them require 3-core wire. I don't want to buy actual 3-core because it's more economical to buy reels of single core and make it up with heatshrink ties along its length.
My question is what colour do I want in addition to the red and black I definitely need ? The wire will be used in applications with multiple positives like auto/manual bilge pumps and tricolour nav lights. To be more specific I am asking if there is any kind of standard in use ?