1) Color
Screening core wire under four cores should be carried out depending on insulator surface color,
other suitable ways. White is good to become natural color of it.
double cores: black white
three cores: black, white, red
four cores: black, white, red, green
2) Numbers
Wire core screening for over 5 cores wires is marked by printed numbers with white ink on black insulators
3) Other Screening
Screening wire cores insulated by over 5 cores XLPE can be signed by coloring surface of insulators, insulators, or other methods