Describe the requirements for underwater lighting installed in pools.

The requirements for underwater lighting installed in pools are indeed that the fixtures must be listed specifically for underwater use, properly installed according to the manufacturer's instructions, and equipped with Ground Fault Circuit Interrupter (GFCI) protection. This is essential to ensure safety, as working with electricity in wet environments poses significant risks.

Fixtures rated for underwater use are designed to withstand the conditions present in a pool, including water pressure, corrosion, and electrical hazards. Proper installation ensures that the lights are securely mounted and sealed to prevent water ingress, which can lead to electrical shorts or failures. Additionally, GFCI protection is a critical safety feature, as it quickly cuts off power in the event of a ground fault, reducing the risk of electric shock to swimmers.

Other choices do not meet the necessary safety standards or practical requirements. Regular household lights are not suitable for underwater environments and lack the necessary ratings. Specifying a depth of less than 12 inches is not accurate, as lighting can be placed deeper, provided it is designed for that purpose. Finally, the installation of underwater lights is not something that can be done by just anyone; it often requires a qualified electrician to ensure compliance with electrical codes and safety regulations.