How is a feeder defined in the context of electrical distribution?

A feeder is defined as a conductor or conductors that carry power from the source to the distribution panels. This definition is crucial because feeders play a central role in the electrical distribution system by transferring electrical power from substations or transformers to panels where it is further distributed to branch circuits. Understanding the role of feeders within the system is essential for ensuring proper load management and system efficiency.

Feeders are typically larger conductors designed to handle significant amounts of current, and they connect the primary distribution system to the secondary distribution system. Their proper sizing, installation, and protection are vital to maintaining the integrity of the electrical system and preventing overloads.

By contrast, the other options refer to different components or functions in the electrical distribution system. Devices that protect circuits are crucial for safety but do not define what a feeder is. Underground cable systems involve methods of installing feeders but do not encapsulate the function or definition of a feeder itself. Measuring devices for electrical loads serve to monitor usage and do not pertain to the transportation of power within the distribution network. This distinction reinforces the importance of understanding what a feeder specifically does within the broader context of electrical distribution systems.