SCE Groundman Practice Exam

The idea is to selectively isolate part of a feeder so a fault or maintenance work can be done without taking the whole line out of service. A sectionalizing switch is opened to separate a defined section, which confines the outage to that portion and allows the rest of the feeder to stay energized. This helps speed restoration and keeps most customers powered while the fault is cleared or the section is worked on. It isn’t used to regulate voltage, measure fault current, or step voltage down for customers—those functions come from other devices like voltage regulators, relays/meters, and transformers.