Easy-Twist Standard Twist-On Wire Connectors - Standard Blue Carton 22-14 AWG APPLICATIONS: Easy-Twist Standard Twist-On Wire Connectors have a flame retardant UL 94V-2 thermoplastic shell that provides excellent electrical insulation. They have a temperature rating of 221 degrees F (105 degrees C). Their fixed, precise square wire spring provides secure gripping of conductors. Their deep skirt entry provides protection from flashover and shorts. Sure-grip ribs improve gripping comfort. Compact design ensures proper installation - especially in tight spaces. Threaded funnel entry guides the wires into the connector easily. Pre-twisting of wires is not necessary. 1,000 volt maximum in fixtures and signs. UL 486C Listed Wire Connector. For Copper Wire Only.