Electrician's Licensing Practice Exam

According to NEC, what is the maximum operating temperature for type FFH-2 fixture wiring?

1. 55 degrees C

2. 70 degrees C

3. 75 degrees C

4. 85 degrees C

The correct answer is: 75 degrees C

The maximum operating temperature for type FFH-2 fixture wiring, as specified in the National Electrical Code (NEC), is indeed 75 degrees Celsius. This temperature rating is crucial because it ensures that the wiring can handle the electrical load without overheating, which could lead to insulation failure, short circuits, or even fire hazards. Wire types are thermally rated for their intended applications, and the designation 'FFH-2' indicates specific characteristics, including its temperature rating. It is important for electricians to adhere to these temperature ratings to ensure both safety and compliance with the NEC guidelines. Proper selection of wiring based on its temperature rating is essential for preventing thermal damage and ensuring longevity of the installation. The other provided options reflect higher temperature ratings that are not permissible for FFH-2 fixture wiring under the NEC. These would not be suitable and could lead to violations of electrical codes and standards.