THHN copper conductors are primarily used in conduit and cable trays for services, feeders and branch circuits in commercial or industrial applications as specified in the National Electrical Code. Voltage for all applications is 600 volts. THHN copper conductors are designed to be installed without application of a pulling lubricant. These conductors have multiple ratings. This is a Stranded Gray 6 AWG wire and is packaged in a 1000 foot spool.