Which conductor type is suitable for high-temperature applications in residential wiring?

The conductor type that is suitable for high-temperature applications in residential wiring is designated as THWN. This type of insulation is a thermoplastic material which is specifically designed to withstand higher temperatures and is rated for use in wet locations. THWN conductors can handle a temperature rating of up to 90°C in dry conditions, and even in wet conditions, they can manage up to 75°C.

The characteristic of being appropriate for high-temperature applications is essential in residential wiring, particularly in areas where wires may be exposed to heat or where loads may cause increased temperatures. THWN's versatility makes it particularly valuable for various electrical installations, including those that might be subject to moisture or higher operational temperatures.

In contrast, other conductor types like THHN, while also capable of handling significant temperatures, are primarily rated for dry locations and do not maintain the same level of performance when exposed to moisture. TW and THW types, while useful for certain applications, do not offer the same temperature ratings in conjunction with moisture resistance as THWN does. Thus, THWN is ideal for high-temperature applications in situations involving both wet and dry locations.