According to the IRC, light fixtures mounted in the walls of a pool must be installed how many inches below the normal level of the pool?

The correct answer states that light fixtures mounted in the walls of a pool must be installed 18 inches below the normal level of the pool. This requirement is crucial for safety and functionality. Installing the fixtures at this depth helps ensure they are submerged to prevent potential hazards associated with electrical components being exposed to the surface water, where they might be accidentally touched or splashed.

Maintaining this depth also helps ensure that the fixtures are effectively positioned for optimal lighting while providing adequate protection from moisture and ensuring that they are out of reach of regular pool activity. Following this guideline promotes adherence to safety standards and best practices defined in the International Residential Code (IRC).