Which of the following is NOT a common service voltage in the United States?

The choice of 372/575 three-phase, four-wire as an option that is not a common service voltage in the United States is accurate. In the U.S., standard voltages for commercial and industrial applications typically adhere to well-established voltage levels set by the National Electrical Manufacturers Association (NEMA) and the National Electrical Code (NEC).

The most prevalent service voltages include 120/240 single-phase, which is commonly used in residential settings, and 208/120 three-phase, which is widely utilized in commercial buildings. The voltage of 277/480 three-phase, four-wire is also standard for commercial and industrial applications, particularly in lighting circuits and larger equipment.

Contrastingly, 372/575 three-phase, four-wire does not conform to these standardized levels and is not typically used as a service voltage in the U.S. This indicates that the option refers to a specific range that doesn't align with the established, widespread voltage levels encountered in North American electrical systems. Understanding standard voltage levels is essential for anyone working in industrial maintenance, as it impacts system integration, safety, and equipment compatibility.