Luminaires within the dimensions of a bathtub and shower must be marked for which locations?

Luminaires installed within the dimensions of a bathtub or shower area must be marked for both damp and wet locations due to the unique environmental conditions present in those areas.

In a bathroom, particularly within the confines of a bathtub or shower, there is a significant risk of exposure to water in various forms, including splashes and steam. This necessitates lighting fixtures that are designed to withstand moisture and potential wetness. Damp location classifications allow for use in areas where condensation or moisture can occur, while wet location ratings are specifically meant for devices that might be directly exposed to water.

The NEC recognizes that because certain parts of the bathroom, especially above bathtubs and showers, can experience direct moisture, appropriate luminaire ratings are crucial for safety. As a result, fixtures installed in these areas must be rated to adequately handle both conditions, hence the requirement for markings indicating compliance with both damp and wet location standards.