Aiphone 87180450C Wire, 4 Conductor, 18awg, Low Cap, PE, Solid, Non-Shielded, 500 Feet All Aiphone wire is stranded unless otherwise indicated. Nonplenum wires have a gray jacket. Plenum wires have a natural jacket. All wires meet the following standards: UL, C (UL), UL444, CA FIRE MARSHAL
