What is the minimum distance for wall-mounted luminaries below the surface of water in a pool?

The minimum distance for wall-mounted luminaires below the surface of water in a pool is specified to ensure safety and avoid electrical hazards. In this case, the correct distance is 4 inches, which is established by various electrical codes and standards, including the National Electrical Code (NEC).

This distance is important because it allows for both adequate clearance from the water's surface and minimizes the risk of electric shock or other electrical hazards that could arise from the interaction of water and electrical equipment. By positioning luminaires at this distance, proper safety measures are maintained while still allowing for effective illumination of the pool area.

Establishing this minimum distance is crucial for maintaining safe operating conditions, as water is a conductor of electricity, and any equipment operating near or in water must adhere to strict guidelines to mitigate risks to users.