UB2A-D Wire Connector 1. Max insulation O.D. 2.08(0.082"); 2. For solid copper 0.9-0.4mm(19-26 AWG) cable. UB2A-D Wire ConnectoroC.3.All materials used in the connectors shall be non-toxic and dermatologically safe.oC to 70oC and humidity range of 0% to 95%.