Type THHN/THWN-2 is appropriate for general wiring applications as outlined by the National Electrical Code (NEC) for 600V applications. THHN/THWN-2 is offered in sizes ranging from #6 to 1000MCM. The conductors are crafted from an 8000 series aluminum alloy and are insulated with durable, heat-resistant PVC (polyvinyl chloride), topped with a nylon (polyamide) jacket. All sizes are equipped with a friction-reducing compound to facilitate the installation process.
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The permissible ampacities displayed are intended for general use in accordance with the specifications outlined in the National Electrical Code, 2011 Edition, Section 310.15 and 240.4(D).
The allowable ampacities presented are designed for general use, adhering to the specifications outlined in the National Electrical Code, 2011 Edition, Section 310.15, and 240.4(D).
When connected to equipment for circuits rated 100 amperes or less, indicated for 14 through 1 AWG conductors, the temperature is 75°C.
For circuits rated over 100 amperes or marked for conductors larger than 1 AWG, the temperature is 90°C. In dry locations, THHN is used, and in wet or dry locations, THWN is employed for ampacity adjustment purposes, following NEC Section 310.15.
