Who ranks for “building wire”

Building wire refers to electrical conductors permanently installed in homes, commercial spaces, and industrial facilities to safely deliver power.

You can browse a wide selection of supplies at The Home Depot or check out commercial inventory via the Graybar Store. You can also learn more about product categories from the Southwire Building Wire Guide.

Common Types of Building Wire

THHN / THWN: Single-conductor wires with PVC insulation and a nylon jacket, primarily used inside conduits or raceways. THWN handles wet locations, while THHN is rated for dry areas. NM-B (Romex): Nonmetallic-sheathed cable containing multiple insulated conductors and a ground wire, used for concealed or exposed indoor residential branch circuits.

Wire Gauges and Uses

14-Gauge: Handles up to 15 amps, standard for basic lighting circuits and general outlets. 12-Gauge: Handles up to 20 amps, used for heavier residential loads like kitchen appliances and bathroom plugs. 10-Gauge and Lower: Handles 30 amps or more, ideal for large appliances, central air units, and subpanels.

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If you'd like, let me know:Is your project residential or commercial ? What specific circuit or appliance are you wiring? Do you need individual conduit wire (THHN) or romex cable (NM-B) ? I can help you find the exact gauge and type you need.