Where may recessed or surface-mounted luminaires be installed in relation to a bathtub?

The correct answer indicates that recessed or surface-mounted luminaires may be installed within the restricted zone, which is crucial for understanding safety requirements in residential wiring, especially in wet areas like bathrooms.

The National Electrical Code (NEC) defines a restricted zone around bathtubs and showers to ensure that electrical installations do not pose a risk of electrocution. This restricted zone extends vertically and horizontally around these water sources. While it is true that special precautions must be taken when installing lighting in these areas, certain types of luminaires may be permitted under specific conditions, including being positioned within this restricted zone if they are rated for wet or damp locations.

Understanding this allows electricians to safely plan and execute lighting installations in bathrooms while adhering to code requirements and ensuring the safety of occupants. Therefore, knowing how to navigate the restrictions of these zones becomes essential for compliance and safety in electrical installations.