How far below the normal operating water level must underwater pool lighting be located?

Underwater pool lighting must be installed a minimum of 18 inches below the normal operating water level to ensure safety and compliance with electrical codes. This distance is critical because it helps mitigate the risk of electrical shocks and ensures that any potential water ingress does not affect electrical components. By positioning the lights at this depth, they are effectively protected from direct exposure to water, which could lead to short circuits or electrical malfunctions. Furthermore, maintaining this depth allows for sufficient water coverage over the lighting fixtures, which enhances their performance and durability.