What is the maximum rating for appliances that a branch-circuit overcurrent device can serve as a disconnecting means?

The maximum rating for appliances that a branch-circuit overcurrent device can serve as a disconnecting means is indeed identified as 300 volt-amperes. This standard is based on the National Electrical Code (NEC), which outlines requirements for overcurrent protection and disconnection capabilities in electrical installations.

When discussing branch circuits and the devices that protect them, it's essential to recognize that they must not only provide protection against overcurrent but also facilitate disconnection for safe servicing. Appliances rated at 300 volt-amperes and lower can be adequately controlled and protected by branch-circuit devices designed to disconnect power safely.

Choosing appliances with a rating higher than this can lead to safety concerns and potential violations of the NEC, making it essential for electricians and installers to adhere closely to these ratings when designing and implementing electrical systems.