32.4-A2)    0-750 Volts and More Than 7500 Volts: Supply circuits of 0-750 volts shall not be carried on the same crossarm with circuits of more than 7500 volts, except that, on transformer structures, bus conductors of 0-750 volts and bus conductors of 7500-20,000 volts may be supported on opposite ends of the same bus-supporting timbers provided the horizontal separation between conductors of different classifications supported on the same arm is not less than 36 inches, the bus conductors of 7500-20,000 volts are not extended longitudinally as line conductors, service drops are not supported on arms which support conductors of 7500-20,000 volts, and conductors on related buck arms are not less than 4 feet vertically from such bus timbers.

32.4-A2)    0-750 Volts And More Than 7500 Volts: Supply circuits of 0-750 volts shall not be carried on the same crossarm with circuits of more than 7500 volts, except that, on transformer structures, bus conductors of 0-750 volts and bus conductors of 7500-21,000 20,000  volts may be supported on opposite ends of the same bus-supporting timbers provided the horizontal separation between conductors of different classifications supported on the same arm is not less than 36 inches, the bus conductors of 7500- 21,000 20,000 volts are not extended longitudinally as line conductors, service drops are not supported on arms which support conductors of 7500-7500-21,000 20,000 volts, and conductors on related buck arms are not less than 4 feet vertically from such bus timbers.

32.4-A2)    0-750 Volts And More Than 7500 Volts: Supply circuits of 0-750 volts shall not be carried on the same crossarm with circuits of more than 7500 volts, except that, on transformer structures, bus conductors of 0-750 volts and bus conductors of 7500-21,000 volts may be supported on opposite ends of the same bus-supporting timbers provided the horizontal separation between conductors of different classifications supported on the same arm is not less than 36 inches, the bus conductors of 7500- 21,000 volts are not extended longitudinally as line conductors, service drops are not supported on arms which support conductors of 7500-21,000 volts, and conductors on related buck arms are not less than 4 feet vertically from such bus timbers.