Insulated cable is #10 gauge, tin-plated copper cable sheathed in clear insulation. Use insulated cable where required by local codes or in coastal areas, where salty air might corrode bare cables. Rated for 300 watts at 12 volts, 600 watts at 24 volts. Load: 300 watt maximum at 12 volts to 30' before voltage drop occurs; 600 watt maximum at 24 volts to 60' before voltage drop occurs.