54.9-E4)    In Rural Districts: In rural districts (see definition, Rule 21.0-B) where one circuit only of 7500-20,000 volts is supported on the poles above conductors in rack construction, the vertical clearance between the top conductor in rack construction and the nearest 7500-20,000 volt conductor level may be less than 6 feet but not less than 4 feet and no guard arm is required.

54.9-E4)    In Rural Districts: In rural districts (see definition, Rule 21.0-B) where one circuit only of 7500-20,000 21,000 volts is supported on the poles above conductors in rack construction, the vertical clearance between the top conductor in rack construction and the nearest 7500-20,000 21,000  volt conductor level may be less than 6 feet but not less than 4 feet and no guard arm is required.

54.9-E4)    In Rural Districts: In rural districts (see definition, Rule 21.0-B) where one circuit only of 7500-21,000 volts is supported on the poles above conductors in rack construction, the vertical clearance between the top conductor in rack construction and the nearest 7500-21,000 volt conductor level may be less than 6 feet but not less than 4 feet and no guard arm is required.