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Our XHHW 1 18 AL 1 gauge wire is part of our Hook Up Wire / Lead Wire line. XHHW 1 18 AL is a 1 awg wire with a stranded aluminum alloy conductor and black XLPE insulation. Weighing approximately 110 lbs/MFT, these wires have a conductor stranding of 18 and a nominal outer diameter of 0.412 XHHW Wire is approved for use in conduit or raceways for circuit wiring in accordance with the NEC. These wires are abrasion, heat, and moisture resistant, have a voltage rating of 600 volts, and a temperature rating of 90ºC.