3 Wire Polaris 250 MCM - 6 AWG Insulated Multi-Cable Connector Blocks Polaris Insul-Tap Connectors are suitable for connecting three wires. Abrasion and chemical resistant. UV rated. Will not support combustion. Cold temperature rated to -45 degrees Celsius. Dual rated for use with copper and/or aluminum cables. 600 volts. Not recommended for fine-stranded, flexible wire (see Polaris Grey Series).