Refer to the nameplate shown in the example. The largest circuit breaker you could install is ___ A.

• A. 45
• B. 50
• C. 40
• D. 35

Answer: (B)

The nameplate shows the maximum overcurrent protection the panel is designed to accept. In this case, it specifies 50 amperes. That means the largest main breaker you can install without exceeding the panel’s rating is 50 A. Installing a larger breaker would push beyond what the bus and conductors are rated to handle, risking overheating and NEC violations. You could choose smaller breakers as needed for specific circuits, but the maximum allowed size is 50 A.