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.
Cost Effectiveness
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.