What is the voltage standard for residential power in the U.S.?

The voltage standard for residential power in the U.S. is 120/240 volts. This configuration represents the two common voltage levels provided by the utility to residential customers.

In most homes, the standard power system consists of a split-phase electrical supply. This means that there are typically two hot wires that carry 120 volts each but are 180 degrees out of phase with each other. When using a single phase, 120 volts is typically used for common household appliances and lighting. However, for larger appliances such as dryers and ovens, 240 volts is utilized, which is derived from using both hot wires.

Thus, the 120/240 volts standard allows for a versatile electrical system in homes, accommodating both standard and high-power appliances effectively. This dual-voltage provision is essential for ensuring that various devices function correctly, providing flexibility for consumers while maintaining safety and efficiency in residential electrical designs.