MIL-W-5086C, MILITARY SPECIFICATION: WIRE, ELECTRIC, POLYVINYL CHLORIDE INSULATED, COPPER OR COPPER ALLOY (2 DEC 1974)., This specification covers polyvinyl chloride insulated single conductor electric wires made with tin-coated copper conductors or silver-coated copper alloy conductors as specified in the applicable military specification sheet. The polyvinyl chloride insulation of these wires may be used alone or in combination with other insulating or protective materials.