What is the maximum voltage between conductors on a branch circuit supplying luminaries?

The maximum voltage between conductors on a branch circuit supplying luminaires is typically 120 V. This voltage level is standard for most residential and commercial lighting systems in North America, as it provides sufficient power for standard lighting applications while remaining safe and manageable for everyday use.

Understanding the context of voltage levels is essential, particularly because lighting circuits are designed to operate safely under specific standards. In general, a 120 V system is adequate for most lighting needs, allowing for a variety of fixtures to be used without requiring more complex and high-voltage systems.

Higher voltage levels, such as 240 V, 277 V, and 480 V, are generally used for specialized applications and industrial settings where powerful equipment necessitates more voltage to operate effectively. However, these are not typical for branch circuits dedicated to general luminaire purposes. Therefore, the correct answer reflects the common practice and safety standards associated with typical lighting circuits.