What is the minimum rating required for the branch circuit disconnecting means for a single branch circuit?

The minimum rating required for the branch circuit disconnecting means for a single branch circuit is 15 amperes. This aligns with the National Electrical Code (NEC) standards for branch circuits, which dictate that certain circuits must have a disconnecting means to allow for safe operation and maintenance.

In residential applications, general-purpose circuits serving outlets, lighting, or receptacles are commonly rated at 15 or 20 amps. However, for the standard requirements regarding branch circuit disconnects, a 15-amp rating is established as the minimum. This ensures that the circuit is adequately protected and can handle the load typically expected for general usage without undue risk of overcurrent conditions.

While higher ratings for branch circuits exist—such as 20 or 30 amps—those apply to specific applications that require more robust systems. A disconnect means rated below 15 amps would not satisfy the necessary safety and performance standards outlined in the NEC, making 15 amps the correct baseline for general use branch circuits.