What type of circuits originate in distribution substations to connect electricity to customers?

The type of circuits that originate in distribution substations to connect electricity to customers is distribution circuits. These circuits are specifically designed to deliver electricity at a lower voltage from the substations directly to residential, commercial, and industrial customers.

When electricity is generated at power plants, it is initially transmitted at high voltages over long distances to minimize energy loss. However, once the electricity reaches a distribution substation, it is transformed to lower voltages suitable for local distribution. From this point, distribution circuits carry the electricity to various end-users.

In contrast, transmission circuits are involved in transporting electricity over long distances at higher voltages, which is not applicable to customer connections. Service circuits generally refer to the connections from distribution circuits to individual customer premises, while utility circuits is a broader term that may encompass various types of circuits used by utility companies without specifically addressing customer connections. Therefore, the designation of distribution circuits is the most precise answer for the context of connecting electricity to customers.