What is the minimum copper size for a lighting circuit fed by a 15-amp breaker when there are multiple outlets?

What is the minimum copper size for a lighting circuit fed by a 15-amp breaker when there are multiple outlets?

• A. 12 AWG
• B. 14 AWG
• C. 16 AWG
• D. 10 AWG

Answer: (B)

On a 15-amp lighting circuit, the conductor must be able to carry at least 15 A. The smallest copper size that meets that requirement in typical residential wiring is 14 AWG. This size is rated for about 15 A with common insulation used in homes, so it provides the needed capacity without being larger than necessary. A smaller conductor, like 16 AWG, would be undersized for a 15-amp circuit. Larger conductors, such as 12 AWG or 10 AWG, would also work but are not the minimum required. So the minimum copper size is 14 AWG.

On a 15-amp lighting circuit, the conductor must be able to carry at least 15 A. The smallest copper size that meets that requirement in typical residential wiring is 14 AWG. This size is rated for about 15 A with common insulation used in homes, so it provides the needed capacity without being larger than necessary. A smaller conductor, like 16 AWG, would be undersized for a 15-amp circuit. Larger conductors, such as 12 AWG or 10 AWG, would also work but are not the minimum required. So the minimum copper size is 14 AWG.