- Wire Set: 20 awg Stranded Bare CopperInsulation: Polyvinylchoride, .008in., nominal wallColor code: 1- Black, 1- Red, 1 – WhiteShield: Aluminum/ Polyester Tape, 100% Coverage (Aluminum side out)Drain Wire: Stranded tin copperIndividual Jacket: Polyvinylchoride, .015 in., nominal wallJacket Color: Black with Red Stripe