What is the maximum voltage for a branch circuit in dwelling units and guest rooms or guest suites in hotels or motels?

• A. 120 volts
• B. 240 volts
• C. 208 volts
• D. 277 volts

Answer: (A)

In dwelling units and guest rooms or guest suites in hotels or motels, the standard for general-purpose branch circuits is 120 volts. This stems from the typical U.S. electrical system, which is a split-phase 120/240 V setup: you get 120 V between either hot leg and neutral, which is what most outlets and common appliances are designed to use. Using 120 V keeps receptacles, cords, and devices compatible and safe for everyday living spaces.

Higher voltages like 208 V or 277 V are reserved for specific commercial, three-phase lighting or equipment systems and would require different outlets and protective equipment. They aren’t used for normal room outlets in residences or hotel guest rooms, which is why 120 volts is the maximum voltage for those branch circuits.