Journeyman Electrician Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the maximum operating temperature for thermoplastic-covered solid fixture wire, Type TFF?

120ºF

140ºF

The maximum operating temperature for thermoplastic-covered solid fixture wire, Type TFF, is indeed 140ºF. This temperature rating is critical for ensuring safety and performance in wiring applications. When wire is exposed to temperatures above its rated capacity, the insulation can degrade, leading to potential failures, shorts, or even fire hazards. Thermoplastic insulation is designed to handle certain renewable heat exposure, and the 140ºF rating indicates the upper limit for continuous operation.

Understanding the temperature ratings associated with different wire types is essential for electricians to select appropriate wiring for specific environments and applications, promoting safety and reliability in electrical systems.

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160ºF

180ºF

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