Hi all Im new here, but have been in the trade for 35 years. I ran an large total remodel project on a city hall in this area. The engineer speced out parrell neutrals to all 120/208 V 3P, 4W panel boards. These were 200 amp. We had to pull 5 #4/0 to each panel from the distrubation panel. He even had parrelle neutrals from the 500 KVA transfromer to the 1600 amp Distrubation panel.
