What type of feed enhances faulted cable isolation and service restoration in underground systems?

The type of feed that enhances faulted cable isolation and service restoration in underground systems is a loop configuration. In a loop feed system, two or more paths can supply power to a location, allowing for greater flexibility in managing power flow. If a fault occurs on one segment of the loop, the system can quickly isolate the issue, reducing the impact on customers and enabling quicker restoration of service.

The loop design also allows for automatic or manual switching to alternative paths, which can maintain service to unaffected areas while repairs are made. This method is particularly advantageous in underground systems where access can be limited, as it fosters resiliency in the network, ensuring that service interruptions are minimized.

In comparison, other configurations might not provide the same level of redundancy and service continuity during a fault. For instance, radial feeds typically only have one path for power delivery and might lead to larger outages when faults occur, while branch and direct feeds do not inherently offer the same isolation and restoration benefits as loops do.