For installations with not more than two 2 wire branch circuits, what is the minimum rating for the service disconnecting means?

In accordance with the National Electrical Code (NEC), for installations with not more than two 2-wire branch circuits, the minimum rating for the service disconnecting means is established at a minimum of 30 amperes. This requirement ensures that the service disconnect is capable of safely handling the load of these circuits, providing adequate protection and allowing for a sufficient amount of current to be supplied without risking equipment failure or hazards.

The 30-ampere rating is grounded in the principle that it offers a balance between functionality and safety for residential or light commercial installations, accommodating typical electrical needs while still adhering to safety standards. By adhering to this requirement, code compliance ensures that installations can effectively manage expected loads while minimizing the risk of overcurrent situations.

This rating reflects the expected demand and the capability of the disconnecting means to handle potential overload conditions without tripping continuously under normal operating circumstances. Thus, the correct answer reflects a fundamental code compliance issue, ensuring that the minimum requirements are met for safe and reliable electrical installations.