... 150deg C 4. Use only as Refrigerator Defrost Heater Wire. UL 3129 Silicone Heating cable Style 3129Insulated Heating Wire Rating150 deg C ... average, 40 mils minimum at any point. StandardAppliance Wiring Material UL 758. MarkingGeneral. UseFor use only as Refrigerator Defrost Heater Wire ... , blue, red, black, brown, yellow, green, transparent, yellow/green, etc... UL 3129 Silicone Heating cable