High-voltage (HV) cable consists of two parts: a conductor made of copper and a protective insulation jacket. These are used for power transmission and can be obtained from dismantled electrical lines and hubs, ignition systems, industrial machinery, etc.
High-voltage cables come in various sizes and lengths and are accepted by most scrap yards.
If you have bulk HV wires, contact the Greener Recycling scrap yard to check on it's current purchase prices and the requirements for high-voltage cable bought for copper recycling.
