Which of the following statements about luminaires as a raceway is true?

Luminaires that are utilized as raceways must be marked for that specific purpose to ensure they meet safety and code requirements. This marking indicates that the luminaire has been designed to safely contain and route conductors, providing a clear understanding for electricians and installers that the equipment can serve a dual function—both as a lighting fixture and a pathway for electrical conductors.

The requirement for marking is important as it helps prevent misuse or installation errors that could lead to safety hazards, such as overheating or short circuits. Such markings ensure compliance with the National Electrical Code (NEC) and enhance overall safety in both residential and commercial settings.

The other choices do not accurately depict the regulations or characteristics of luminaires designated to function as raceways.