Twist On Wire Connector Color Gray/Orange For Conductor Material Copper Maximum Operating Temperature 221 Degrees F Maximum Voltage 600 V Minimum Wire Combination (2) 20 AWG Maximum Wire Combination (2) 14 AWG Contact Material Steel UL 94 Flammability Rating V-2 Maximum Conductors 4 Standards CE CSA Certified UL Listed Wire Connector Style Wing Fill Material Silicone Insulation Material Thermoplastic Polyester Maximum Single Wire Size 14 AWG Minimum Single Wire Size 22 AWG