What is the minimum distance a 125V receptacle must be installed from the inside wall of a permanently installed pool?

The correct distance for installing a 125V receptacle from the inside wall of a permanently installed pool is indeed 6 feet. This requirement helps to provide a safe distance to minimize the risk of electrical shock, which is particularly crucial in wet locations such as pools. The NEC specifies these distances to ensure that any electrical equipment, including receptacles, is placed far enough away from the water's edge to reduce the danger of accidental contact with water, which can conduct electricity.

In the context of pool installations, adherence to the specified distance ensures that the receptacle is not only accessible but also positioned safely away from potential splashes or water interactions. By following this requirement, installers can comply with safety regulations aimed at protecting pool users from electrical hazards. This distance is determined based on the potential for water presence and the risk of electrical equipment being compromised by moisture.

The other distances provided in the options either do not meet the NEC's safety standards for receptacles near pools or are simply not applicable based on current regulations.