Five-hundred-foot coil of #12 (12 AWG) stranded copper THHN/THWN-2 dual-rated building wire. The stranded copper conductor is insulated with a flame-retardant PVC inner layer and jacketed with a tough, slick nylon outer skin that resists abrasion through conduit, oils, gasoline, and moisture -- THHN = Thermoplastic High Heat-resistant Nylon-coated. Standard branch-circuit conductor for residential and light commercial work: pull through EMT, IMC, rigid PVC conduit, or cable trays for receptacle, lighting, appliance, and equipment circuits. Stranded (versus solid) pulls easier through long conduit runs with multiple bends and terminates more reliably under set-screw lugs.

• 12 AWG stranded uncoated copper conductor (7 strands)
• 500 ft coil/spool
• 600V rated; 90 deg C dry, 75 deg C wet (THHN/THWN-2 dual rating)
• Flame-retardant PVC insulation with nylon jacket
• Resistant to abrasion, moisture, gasoline, and oils
• UL Listed

Selection Tip: Black is the workhorse hot conductor color -- Phase A in commercial 208/120V wye, the standard hot in residential 120V branch circuits, and one of the two hots in 120/240V single-phase circuits. Always pair with white (neutral) and green (ground) in 20A branch-circuit pulls; pair with red and green in 240V circuits with no neutral.

Use Tip: Apply pulling lubricant (Polywater J, Yellow 77, or similar wire-pulling lube -- not soap or grease) on long conduit pulls or 3+ bends. Even with the nylon jacket's slick finish, friction stacks fast across 90-degree sweeps and can tear insulation if you yank with a fish tape. For multi-conductor pulls (three or four runs in the same conduit), apply derating per NEC Table 310.15(C)(1) and verify the conduit fill from Table 4 of Chapter 9.

Ampacity Note: 12 AWG copper is rated 20A on a standard residential branch circuit -- the 25A and 30A higher-temperature columns in NEC Table 310.16 don't apply because terminations on common breakers and receptacles are 60 deg C or 75 deg C rated. Pair with a 20A breaker and 20A-rated devices for 20A circuits; never derate to 15A breakers with 12 AWG (over-fusing in the wrong direction creates breaker mismatch). For 30A circuits, step up to 10 AWG.

Storage Tip: Coil winds onto a reel cleanly when feeding off the top of the original carton. Store off the floor in a dry area; the nylon jacket resists oil and water but PVC stiffens and cracks below ~14 deg F, so let cold-stored wire warm to room temperature before pulling to avoid jacket fractures at the bends.

Note: THHN is conductor-only wire intended for installation inside conduit or raceway. For exposed in-wall work (residential framing without conduit), use NM-B (Romex) cable -- THHN by itself is not a cable assembly. Code-compliant color codes per NEC 200.6 (white = grounded/neutral) and 250.119 (green = equipment ground); black/red and other non-white/non-green colors identify ungrounded conductors.