THHN / THWN building wire
THHN and THWN are the most common leftover wire on any commercial or industrial job.
Wire we buy
Metal-clad and armored cable arrives on site in 250-foot and 1,000-foot coils, gets cut for a dozen branch runs, and leaves a stack of partial coils behind. We buy those coils, plus the full ones nobody installed.

01Overview
MC cable (metal-clad) and AC cable (armored cable, sometimes called BX) are factory assemblies of insulated conductors inside a flexible metal armor. MC is common in commercial construction — schools, retail, hospitals, parking structures — because it can be installed without conduit in many assemblies.
The leftover problem is always the same: a job needs 3,000 feet, the contractor buys 3,500 in coils, and 800 feet of partial coils sit in the shop for two years afterwards. Multiply that across a dozen jobs and it becomes a pallet worth quoting.
02Specifications
| Common constructions | MC, MC-HCF, MC-AL, AC, AC-HCF, healthcare and hospital-grade armored cable |
|---|---|
| Armor | Interlocked steel or aluminum |
| Conductor metal | Copper (mostly), occasional aluminum MC feeders |
| Typical configurations | 2, 3 and 4 conductor with ground; 12/2, 12/3, 10/2, 10/3, 8/3, 6/3 and larger feeders |
| Voltage rating | 600V |
| Packaging we see | 250 ft coils, 1,000 ft coils, 500 ft spools, cut lengths |
03Details
The printed legend on the armor, the conductor count and size, and the coil tag. Photos that show whether the coil is factory-tied or has been opened matter too — opened coils are still saleable but need to be wound and secured before pickup so they do not birdnest in transit.
Aluminum armor weighs less and is common in feeders; steel armor dominates branch-circuit work. The difference affects handling and freight, not just value, so tell us which you have where it is obvious.
Commercial contractors after schools, clinics, hotels and retail shells; mechanical and electrical crews on plant expansions; and demolition contractors stripping a building before teardown, where new MC is sometimes removed unused from a partially completed scope.
04Questions
Yes, if the remaining length is known or can be measured and the armor is not crushed. Coils that have been dragged across a slab and flattened are harder to place.
Describe the damage in the form. Some lots we can still work with, especially when the conductor inside is intact and the lot is large enough to justify rewinding.
05Request a quote
Tell us the size, metal, voltage and footage, and attach photos of the tags. If something is unknown, leave it blank and describe it in the notes.
Send the reel details and photos. We will tell you what the lot is worth and how a pickup would work.
06Keep reading
THHN and THWN are the most common leftover wire on any commercial or industrial job.
XHHW and XHHW-2 appear on feeders, service entrances, rooftop units and industrial power runs, often in sizes from #6 up to 750 MCM.
Find the corridor your material sits in, from Cheyenne to Cody.