Building Wire

Mid America Wire & Cable stocks a comprehensive selection of building wire for commercial, industrial, and residential electrical installations. From THHN/THWN-2 single conductors to USE-2 service entrance cable, our building wire products meet NEC requirements and carry UL listings. Available in copper and aluminum conductors across a full range of AWG and MCM sizes, with solid and stranded options.

21 product lines Ships nationwide UL / Mil-spec options
8 sub-categories · 21 product lines

About Building Wire

Building wire is the backbone of every electrical installation, powering everything from branch circuits and lighting to feeders and service entrances. Mid America Wire & Cable stocks THHN and THWN-2 dual-rated single conductors in copper and aluminum from 14 AWG through 1000 MCM, in solid and stranded constructions, and in all standard NEC colors. THHN/THWN-2 is dual-rated for dry (90°C) and wet (75°C) locations and is the most widely specified single-conductor building wire in North America. For service entrance applications, we carry USE-2 (Underground Service Entrance) and RHH/RHW-2 cable. All building wire is UL-listed and manufactured to meet or exceed UL 83, UL 854, and NEC Article 310 requirements.

Free sizing tools: Wire Size & Voltage Drop Calculator AWG Wire Gauge Chart

Building Wire: Frequently Asked Questions

Nearly all modern building wire is manufactured as dual-rated THHN/THWN-2. THHN is rated 90°C in dry locations; THWN-2 is rated 90°C in wet or dry locations. The same physical wire carries both ratings, so THHN/THWN-2 can be used in any NEC-compliant dry, damp, or wet location.

The NEC requires specific colors only for grounded (neutral) and grounding conductors: white or gray for neutral, green or green/yellow for ground. Ungrounded (hot) conductors can be any color other than white, gray, or green, but common conventions are black, red, blue, and yellow for 120/208/240V systems, and brown, orange, yellow for 277/480V systems.

Yes. We stock aluminum THHN/THWN-2 and XHHW-2 in 6 AWG through 1000 MCM for large feeders, service entrances, and cost-sensitive applications where aluminum's lighter weight and lower cost are desired.

USE-2 (Underground Service Entrance) is a cross-linked polyethylene (XLPE) insulated cable rated for direct burial and wet locations at 90°C. It's commonly used for service entrance feeders from utility transformers to meter bases, and for underground feeders to detached buildings, subpanels, and irrigation equipment.

Building Wire is Used In

Construction
Electrical
Manufacturing

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