CPGI-WC-WG-GR-BG-250 - 

TE Connectivity WireGrip Connectors
WireGrip connectors or wire splices with industry standard Color coding for wire sizes 22 to 10 AWG. These WireGrip twist-on splices have square-wire spring threads which provide a positive grip for a secure connection and are made from UL 94V-2 flame retardent thermoplastic with a maximum operating temperature of 105°C. The maximim voltage rating for these WireGrip splices is 600V for building wiring and 1000V maximum in lighting fixtures, luminaries and signs, the blue and gray WireGrips are rated at 300V. These WireGrip connectors are for use with copper to copper connections only.