What is the common voltage rating for residential power in the United States?

The common voltage rating for residential power in the United States is indeed 120/240 volts. This voltage configuration allows for flexibility in residential electrical systems. Most household appliances and lighting fixtures operate on 120 volts, which is derived from one leg of the 240-volt service. Meanwhile, larger appliances such as ovens, dryers, and air conditioning units typically require the full 240 volts to operate efficiently.

The split-phase electrical system used in homes provides two 120-volt lines that can be combined to supply 240 volts when necessary, hence the 120/240 designation. This makes it a standard practice for residential installations, ensuring safety and versatility in power distribution.

In contrast, single voltage options such as 120 volts or 240 volts alone do not encompass the full range of residential electrical needs. 280 volts is not a standard residential voltage and would not be found in typical home installations.