In what type of service is a 120/240-volt, single-phase, 3-wire supply typically used?

A 120/240-volt, single-phase, 3-wire supply is most commonly utilized in residential settings, particularly in single-family dwellings. This type of electrical service is designed to provide the necessary voltage for typical household appliances, lighting, and other electrical needs. The configuration allows for both 120-volt and 240-volt circuits, which is suitable for various household devices, including high-demand appliances like dryers and ovens, as well as general lighting and receptacles.

In a single-family dwelling, the use of this electrical service supports the diverse power requirements of everyday living, making it a standard choice for the residential sector. It provides an effective balance between power capacity and efficiency needed for residential applications.

While other types of buildings such as commercial establishments and industrial facilities may use different voltages and wiring configurations to meet more complex or heavier power demands, the 120/240-volt service remains integral to maintaining the electrical needs of a household setting. An apartment complex, though having some similarities, generally uses a different arrangement that accounts for multiple units, which can lead to variations in electrical service types.