What is the standard voltage for commercial distribution systems in the United States?

The standard voltage for commercial distribution systems in the United States is typically 120/240 volts single-phase or 277/480 volts three-phase. This configuration supports a variety of electrical systems used in commercial applications, including lighting and general power distribution.

The 120/240 volts single-phase system is prevalent in light commercial applications and residential settings, providing ample voltage for typical equipment and appliances. The 277/480 volt three-phase system is commonly used in larger commercial and industrial settings where higher power levels and efficiency are necessary for equipment such as motors, HVAC systems, and heavy machinery.

By adhering to these standardized voltages, electrical installations ensure compatibility with the vast majority of machinery and systems in the industry, facilitating safe and efficient operations while minimizing the risk of equipment failure due to incorrect voltage levels.