What type of insulation is commonly rated for high heat applications?

Thermoplastic insulation, such as THHN, is specifically designed to handle high heat applications. This type of insulation is made from a thermoplastic material that can withstand elevated temperatures without degrading or losing its insulating properties. THHN wire, commonly used in a variety of electrical installations, can operate at high temperatures, making it suitable for environments where higher heat tolerances are necessary.

The material composition and design of thermoplastic insulation allow it to provide robust protection against heat, which is crucial in maintaining the integrity and safety of electrical systems in hotter conditions. The ability to endure significant heat makes this option particularly important in various industrial applications where heat generation is common.

In contrast, copper insulation is not commonly referred to as a standalone insulating material, but rather it denotes the metal itself, which is a conductor rather than an insulator. Rubber insulation can provide decent heat resistance but may not hold up as well in extreme heat situations compared to thermoplastic types. Fiberglass insulation is typically used for thermal insulation in buildings and HVAC systems rather than electrical applications, thus making it less relevant for high-heat electrical wiring applications.