ICC Residential Electrical Inspectors Practice Exam

What is the minimum temperature rating for conductors under termination provisions for circuits rated less than 100 amps?

1. 60 degrees Celsius

2. 75 degrees Celsius

3. 90 degrees Celsius

4. 100 degrees Celsius

The correct answer is: 60 degrees Celsius

The minimum temperature rating for conductors under termination provisions for circuits rated less than 100 amps is indeed 60 degrees Celsius. In electrical installations, the temperature rating of conductors is crucial because it indicates the maximum temperature at which the conductors can operate safely without degrading their insulation or leading to potential failures. For circuits rated under 100 amps, the National Electrical Code (NEC) stipulates that conductors must have a minimum temperature rating that aligns with standard practices and ensures safety. Conductors rated for 60 degrees Celsius (140 degrees Fahrenheit) are typically used for such applications, ensuring that they can handle the expected thermal conditions without compromising performance. Higher temperature ratings, like 75 or 90 degrees Celsius, may be applicable for certain situations or specific types of conductors, but for general installation purposes under 100 amps, the 60 degrees Celsius rating serves as the essential standard, aligning with the NEC requirements. This ensures effective circuit operation while maintaining safety and reliability.