What is the maximum 2 pole breaker size allowed for each Q Cable (12AWG) PV AC branch circuit?

• A. No maximum it depends on microinverter count
• B. 20 AMP
• C. 80 AMP
• D. 15 AMP

Answer: (B)

The limit is set by the conductor’s ampacity and the listing of the Q Cable. A 12 AWG copper PV AC branch circuit is protected up to 20 amperes, so the maximum 2-pole breaker you can use for each Q Cable is 20 A. This protects the insulation and prevents overheating of the cable while still allowing typical inverter output on that branch. An 80 A breaker would exceed what the 12 AWG cable is rated to carry, and a 15 A breaker underutilizes the conductor and isn’t the listed maximum. The count of microinverters on the circuit doesn’t change this limit—the cable’s rating does.