What is the function of a backfeed circuit?

A backfeed circuit is designed primarily to redirect power into a building. This typically occurs when there is an alternate power source, such as a generator, that needs to supply electricity to the building during a power outage or other circumstances where the main power supply is interrupted. The backfeed capability allows the power generated to flow back into the home or facility's electrical system, effectively providing a source of electricity where it is needed most.

In the context of this function, it is crucial to understand safety measures involved with backfeed circuits. Proper configuration and safety devices, such as transfer switches, are necessary to prevent backfeeding into the utility lines, which can pose risks to utility workers and negate the benefits of the backup supply. The other options pertain to different functionalities not specific to backfeeding; they either focus on power distribution, safety measures unrelated to the function of backfeed, or voltage maintenance, which are all essential aspects of electrical systems but not the primary function of backfeed circuits specifically.