What is the common voltage level for commercial electrical systems?

The common voltage level for commercial electrical systems typically falls within the range of 208/120 volts and 480/277 volts. These voltage levels are widely used in commercial settings for various electrical applications.

The 208/120 volt system is prevalent due to its suitability for lighting, heating, and general appliance usage, and it often originates from three-phase services, which are ideal for commercial buildings that require power for multiple large electrical loads simultaneously. The 480/277 volt system is commonly utilized for larger industrial applications, especially for motors and heavy machinery, due to its efficiency in handling high-power demands with lower current levels, which also helps to mitigate the heat generated in wiring.

Industrial and commercial settings require power systems that can accommodate greater loads and improve energy efficiency, making these voltage levels more ideal than the lower voltages typically found in residential systems. Thus, the preference for these specific voltage levels in commercial applications highlights their effectiveness in meeting operational demands.