Final answer:
The National Electrical Code requires that switches for a spa or hot tub be located at least 5 feet away from the inside walls to avoid electrical shock hazards.
Step-by-step explanation:
The National Electrical Code (NEC) specifies safety regulations concerning electrical installations, which includes the requirements for the placement of switches for a spa or hot tub. The code requires that switches be located at least 5 feet from the inside walls of the spa or hot tub to prevent electrical shock hazards. This safety measure ensures that individuals cannot simultaneously touch the water and the electrical switch, which could lead to electric shock or electrocution.