Which of the following voltages is typically seen in commercial electrical systems?

In commercial electrical systems, various voltages are used to meet the needs of different applications, and all the listed voltages—120 volts, 240 volts, and 480 volts—are common.

120 volts is typically used for general lighting and receptacle circuits, as it provides a safe, standard voltage for residential and light commercial applications. Most electronic devices, household appliances, and lighting fixtures are designed to operate at this voltage.

240 volts is often utilized for heavier equipment, such as HVAC systems or larger appliances in commercial settings. It is less common in standard outlets but is crucial for specific high-current applications where greater efficiency is needed.

480 volts is typically found in industrial environments and larger commercial applications. It is commonly used for powering three-phase motors and equipment, which require higher voltage for efficiency and to reduce the amount of current needed, thereby minimizing energy loss.

Thus, the inclusion of all these voltages in commercial systems demonstrates the variety and flexibility needed in electrical installations to accommodate different types of equipment and usage demands.