Differentiate THHN and THWN Wires

What happens here

Following the discussion on THHN, the quiz proceeds to compare it with THWN (Thermoplastic Heat and Water Resistant) wire, another common type of copper building wire. The "Master Electrician Dad" asks his sons to identify a wire similar to THHN but suitable for service applications, which is correctly identified as THWN. He then prompts them for the fundamental difference between THHN and THWN. The crucial distinction is illustrated with a comparison graphic: THHN is characterized by its "Thermoplastic High Heat Resistant Nylon" insulation, a maximum temperature rating of 90°C (194°F), and is typically specified for dry locations with a nylon-coated jacket. In contrast, THWN shares the thermoplastic and heat-resistant properties but crucially includes "Water Resistant" due to its "Thermoplastic Heat and Water Resistant" insulation. It has a slightly lower maximum temperature rating of 75°C (167°F) and is designed for use in both dry and wet locations, featuring a water-resistant thermoplastic jacket. The presence of the "W" explicitly signifies its weather and moisture resistance. The video also highlights that these wire types are commonly used in projects such as electrical subpanels, outdoor runs through conduits, and motor leads for HVAC systems, emphasizing the practical application of this knowledge.

Goal: Understand the specific characteristics, temperature ratings, and suitable environments for THHN versus THWN copper building wires.