What is the largest permitted breaker that can be installed in the panel for Motor 3?

To determine the largest permitted breaker that can be installed in the panel for Motor 3, one must reference the National Electrical Code (NEC) guidelines relating to motor circuits. The allowable breaker size typically depends on the full load current of the motor and any applicable NEC rules concerning overcurrent protection.

For most applications, the breaker size is generally calculated based on the motor's horsepower and service factor. A common rule is that the circuit breaker for a motor can be sized at 125% of the motor's full load current for branch circuits. If Motor 3 has a full load current value that aligns with a 60-amp breaker, then selecting that size ensures proper protection while adhering to the NEC guidelines.

In this context, the 60-amp breaker would be the largest size allowed based on optimization and safety measures that exist within electrical installations. Choosing a larger breaker could result in inadequate protection for the motor since it may not trip during an overload, potentially leading to motor damage.

Knowing the maximum permissible size is critical for ensuring efficiency and safety in electrical installations. Selecting this breaker size allows for the appropriate protection without exceeding rated limits, thus maintaining system integrity and functionality.