Posted by ACDC USA on 4/28/2023 to
News & Blogs
Electrical Wire Label Codes & What They Mean: Here are some of the most common codes being used on today's electrical cables/wires:
- NM (Non-metallic sheathed): Used for indoor wiring in dry locations.
- UF (Underground Feeder): Used for direct burial underground.
- THHN/THWN (Thermoplastic High Heat-resistant Nylon-coated/Thermoplastic Heat- and Moisture-resistant Nylon-coated): Used for wiring in conduit systems, indoor/outdoor locations, and wet/damp areas.
- XHHW (Cross-linked Polyethylene High-Heat-resistant Water-resistant): Used for high-temperature applications in commercial/industrial settings, outdoor/indoor locations, and wet/damp areas.
- USE (Underground Service Entrance): Used for underground installations from a power source to a building.
- TFFN (Thermoplastic Flexible Fixture Nylon-coated): Used for light fixtures and appliances, and may be used in conduit.
- MTW (Machine Tool Wire): Used for internal wiring in appliances and equipment.
- THW (Thermoplastic Heat-resistant Water-resistant): Used for indoor/outdoor locations in conduit, underground, and wet/damp areas.
- THWN-2 (Thermoplastic Heat- and Moisture-resistant Nylon-coated): Used for indoor/outdoor locations in conduit, underground, and wet/damp areas.
- SJOOW (Service Junior Oil-resistant with Outdoor Jacket): Used for portable tools and equipment.
- SJTW (Service Junior Thermoplastic with Outdoor Jacket): Used for portable tools and equipment.
- SOOW (Service Oil-resistant with Outdoor Jacket): Used for heavy-duty portable tools and equipment.
- STW (Service Thermoplastic with Outdoor Jacket): Used for light-duty portable tools and equipment.
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