The NEC permits busway taps only in an industrial establishment where the maximum length of the tap does not exceed which of the following?

The correct answer is based on the guidelines established in the National Electrical Code (NEC) regarding busway taps in industrial settings. The NEC allows busway taps to be used specifically in industrial establishments, and one of the key regulations is the maximum allowable length for these taps.

When the tap does not exceed 50 feet, it ensures that the current-carrying capacity and thermal limits of the busway are not compromised, which is essential for maintaining safety and performance standards. This limit is designed to prevent issues such as voltage drop, overheating, or exceeding the rating of the busway conductors.

Thus, keeping the tap within this length aligns with the NEC’s emphasis on safety and proper installation practices in industrial environments, ensuring that electrical systems operate correctly and efficiently while minimizing potential hazards.