Wire & Cable Your Way offers a wide selection of THHN Building Wire products at the best prices you'll find anywhere. THHN building wire is appropriate for use in alternating current (AC) electrical distribution systems of almost every industrial, residential and commercial building, usually at voltage levels ranging from 110-600 volts. It is is generally used to carry electrical current to all external uses of power in a building or dwelling. THHN wire may also be used for wiring of machine tools, control circuits or on certain appliances.
When it comes to integrating THHN wire into your project, it is important to understand that THHN is UL listed with a rated 90 degrees Celsius in dry locations or 75 degrees Celsius in wet applications with a THWN rating. The majority of THHN wire carries a dual rating on the cable marked THHN / THWN for both the wet and dry temperature rating.
THHN wire Properties
The different letters in THHN wire denote particular properties of the cable:
T for Thermoplastic
HH for High Heat-Resistent, and
N for Nylon Coated .
For wire also rated as THWN: Thermoplastic Heat and Water Resistant Nylon Coated.
These characteristics make THHN wire an excellent choice for controlling outdoor factors that would otherwise alter the performance of wire cable. For end users, this means greater flexibility for applications like push-button stations, fire alarm controls, and temperature control systems.
THHN wire has grown in popularity since it is a cost effective alternative compared to other types of building wire. For indoor and outdoor applications where longevity is valued, THHN wire provides the peace of mind that contractors and homeowners demand. Because THHN wire is UL-approved for permanent installation, it is commonly used in new construction and a variety of other projects where the wire will not need to be removed.