In a multi-family building with 12 units, what is the total system voltage typically used?

In a multi-family residential building, such as one with 12 units, the typical total system voltage used is 120/240 volts. This voltage configuration is common for residential applications because it provides both 120 volts for standard household appliances and lighting circuits, as well as 240 volts for larger appliances like ovens and dryers.

The 120/240 volt system is favored in residential settings due to its efficiency and compatibility with typical household electrical devices. It ensures that residents have access to the necessary voltage for everyday functionality while remaining safe and compliant with electrical standards. This configuration allows for a balanced distribution of electrical loads across the building, facilitating effective operation of multiple units simultaneously.

In contrast, the other voltage options listed (240/480V, 120/208V, and 277/480V) are more commonly associated with commercial or industrial applications, which involve different electrical requirements, equipment types, and load distributions that are not typical for a standard multi-family residential setting.