A lighting fixture installed under a covered porch protected from rainfall must be listed for use in which type of location?

The correct choice is that a lighting fixture installed under a covered porch protected from rainfall must be listed for use in a damp location. This is because the fixture, while sheltered from direct rain, can still be exposed to moisture from humidity and condensation commonly found under a porch area.

Damp locations are those areas where moisture may accidentally be in contact with the fixture, such as in areas that are covered but not fully enclosed. Therefore, fixtures meant for damp locations are designed to withstand some level of moisture without compromising safety or functionality.

In contrast, fixtures rated for dry locations would not be suitable since they are not designed to endure the potential humidity or damp conditions that may arise in such a setting. Fixtures rated for wet locations are specifically intended for installations directly exposed to water, such as outdoor fixtures that do not have any kind of covering. Lastly, those rated for indoor locations are designed solely for interior use and cannot tolerate exterior moisture, making them unsuitable for installation in any location that might experience dampness.