Final answer:
The minimum distance the insulated rack must be kept below the "F" fitting on a service mast depends on the voltage of the electrical service provided. For a voltage range of 0-300 volts, the minimum distance is 3 feet. For a voltage range of 301-750 volts, the minimum distance is 4 feet. For a voltage range of 751-35,000 volts, the minimum distance is 6 feet.
Step-by-step explanation:
In an overhead service to a single dwelling, the minimum distance the insulated rack must be kept below the "F" fitting on a service mast depends on the voltage of the electrical service provided. According to the National Electrical Code (NEC), for a voltage range of 0-300 volts, the minimum distance is 3 feet. For a voltage range of 301-750 volts, the minimum distance is 4 feet. For a voltage range of 751-35,000 volts, the minimum distance is 6 feet.