Range min 2 #22 sol max 3 #16 300 voltage. Cambridge wire connectors are designed with a flame retardant thermoplastic shell to provide excellent electrical insulation. Their fixed precise square wire spring provides a secure grip on conductors their deep skirt entry provides protection from flashover and shorts and their sure-grip ribs improve gripping ability and comfort. Cambridge wire connectors are UL listed and CSA certified and are color-coded to industry standards. Contractor pack packaged in a convenient storage box. Cambridge performance driven and high quality products are preferred by industry leaders.