What is the maximum allowable voltage for branch circuits in dwelling units and guest rooms in hotels or motels?

The maximum allowable voltage for branch circuits in dwelling units and guest rooms in hotels or motels is 120 volts. This standard is primarily established for safety reasons, particularly to minimize the risk of electrical shocks and ensure that the circuits are suitable for typical household appliances and lighting fixtures.

In residential settings, 120 volts is the standard voltage for most outlets, which aligns with the electrical needs of common devices such as lamps, computers, and kitchen appliances. This level provides adequate power for these applications while remaining safely within the limits that can be handled by typical circuit protection devices, such as fuses and circuit breakers.

In contrast, higher voltages can pose an elevated risk, particularly in environments where individuals may be more vulnerable, such as hotels, motels, or residential units. Therefore, the established code prioritizes lower voltage systems in these settings to enhance occupant safety and reduce the likelihood of serious electrical hazards.