In a 3-phase electrical system, what does 120/208 volts typically refer to?

In a 3-phase electrical system, 120/208 volts refers to the main voltage supply configuration commonly used in commercial and industrial settings. This voltage notation indicates that the system has three phases with each phase providing 208 volts between them, while the voltage measured from any phase to the neutral typically yields 120 volts. This setup is prevalent because it efficiently delivers power while maintaining a balanced load across all three phases.

The 120-volt supply is most commonly utilized for standard lighting and receptacle circuits, while the 208-volt supply is used for heavier loads, such as motors and larger equipment. Together, these voltage levels allow for versatile applications, making this configuration a standard for many establishments.

Each of the other options describes different aspects of electrical systems not specifically related to the main supply voltage. Neutral voltage potential pertains to the reference point of a system that helps to stabilize voltage levels, secondary distribution voltage usually refers to voltages stepped down from primary lines for local distribution, and signal transmission voltage relates to signals in communication systems, not the main power supply. Hence, while they are important concepts in their own rights, they do not directly describe the 120/208 volts in a 3-phase electrical system.