Underground distribution circuits are most often supplied from what type of circuit?

Underground distribution circuits are typically supplied from overhead feeder circuits because these overhead systems are designed to provide power to various distribution points. Overhead feeders are capable of covering longer distances and can efficiently transport electricity from substations to areas where underground systems are more practical for local distribution, such as residential neighborhoods or city centers.

The use of overhead feeders is particularly advantageous due to their ease of maintenance and lower initial installation costs compared to fully underground systems, which require more complex installations and ongoing maintenance considerations. The overhead feeder supplies power above ground, while the underground circuits serve the final delivery to residential or commercial establishments, effectively creating a reliable and efficient distribution network.

The other options represent different types of circuits that serve specific roles in the power distribution network but do not typically supply underground distribution circuits directly. For instance, service lateral circuits are used to connect buildings to the main supply, while transmission circuits are designed for high-voltage long-distance transmission, and underground circuits are specifically for direct underground distribution rather than being a source for other circuit types.