Final answer:
The minimum horizontal distance for the disconnecting means from the inside walls of a pool, spa, or hot tub is determined by the local electrical code or regulations.
Step-by-step explanation:
In electrical systems, it is required to provide means to simultaneously disconnect all ungrounded conductors for all equipment (except lighting). These means should be readily accessible and within sight from the equipment it serves. Specifically, for pools, spas, or hot tubs, these means should be located at least a certain distance from the inside walls. The minimum horizontal distance for the disconnecting means from the inside walls of a pool, spa, or hot tub is determined by the local electrical code or regulations. It is important to refer to the code requirements for the specific location to determine the applicable distance.