ICC Residential Electrical Inspectors Practice Exam

According to NEC, the termination provisions for equipment circuits marked for conductors rated at a minimum of 75 degrees Celsius shall use which size conductor?

1. #2 AWG

2. #1 AWG

3. #3 AWG

4. #4 AWG

The correct answer is: #1 AWG

The National Electrical Code (NEC) stipulates specific requirements for conductor sizing based on the temperature rating of the conductors and the intended use. When equipment circuits are marked for conductors rated at a minimum of 75 degrees Celsius, the appropriate conductor size is crucial to ensure safety and effective operation. For circuits requiring conductors rated at 75 degrees Celsius, the conductor sizing must conform to the ampacity tables in the NEC that correspond to this temperature rating. In general, a #1 AWG copper conductor has a sufficient ampacity to handle higher load requirements while maintaining safety standards under this rating. Using a #1 AWG conductor provides greater durability and capacity for electrical loads, preventing overheating and potential fire hazards. It is essential to select the right conductor size to comply with NEC requirements and to ensure that the electrical system operates within safe limits, especially when higher temperature ratings are involved. This approach supports the integrity of the electrical installation and complies with broader safety standards.