What makes purple wire nuts ul listed for AL to CU splices ?
I doubt the color has anything to do with it
But at same time color is likely used as a indicator that this likely is one designed for that purpose. Nobody really makes a purple connector not designed for that purpose so this assists in quicker visual identification. If you are totally color blind, it may not mean anything to you.
Ideal makes them.What makes purple wire nuts ul listed for AL to CU splices ?