What is required for a branch-circuit overcurrent device if the feeder overcurrent device is not accessible?

The requirement for a branch-circuit overcurrent device when the feeder overcurrent device is not accessible is multifaceted, indicating that a comprehensive approach is necessary to ensure safety and adherence to code.

Installing the branch-circuit overcurrent device on the load side provides direct protection to the circuit that it serves, facilitating immediate deactivation of the circuit to prevent overcurrent conditions from damaging equipment or creating hazards. This positioning is crucial when the feeder device is not easily accessible, as it ensures that there is a means to protect the branch circuit independent of the feeder.

Additionally, it is important for the branch-circuit overcurrent device to be mounted in a readily accessible location. This accessibility guarantees that personnel can quickly locate and operate the device in case of an emergency or during maintenance, which is essential for safety.

Furthermore, the requirement for the branch-circuit overcurrent device to have a lower ampere rating than the feeder overcurrent device ensures that it will trip before the feeder device, protecting the wiring and connected devices from potential overload conditions. This hierarchical protection strategy is aligned with the principle of ensuring that circuits are adequately safeguarded against overcurrent scenarios.

In summary, when the feeder overcurrent device is not accessible, all these criteria are crucial to maintain safety,