ICC Residential Electrical Inspectors Practice Exam

What is the minimum copper conductor size allowed for lighting circuits with more than two outlets protected by a 15 amp breaker?

1. 12 AWG

2. 14 AWG

3. 16 AWG

4. 18 AWG

The correct answer is: 14 AWG

For lighting circuits with more than two outlets protected by a 15 amp breaker, the minimum copper conductor size that is allowed is 14 AWG. This size is compliant with the National Electrical Code (NEC) standards, which specify the requirements for conductor sizing based on the circuit's ampacity and the number of outlets. Using 14 AWG wire ensures that the circuit can safely handle the load from multiple lighting fixtures without overheating, providing both safety and reliability. If a smaller conductor size, such as 16 AWG or 18 AWG, were used, it could lead to inadequate current carrying capacity, increasing the risk of overheating and potential fire hazards. In summary, the choice of 14 AWG for lighting circuits with several outlets on a 15 amp breaker is both a safety measure and a code requirement, ensuring the system is designed to handle the expected electrical load appropriately.