Hello All. Working on renovation of banquet hall lighting. Total of 9 rows, with 15 fixtures each row(4 bulb 40w fluor.) Each row of 15 will be on own circuit & switch. 2400W per row. Service is 3ph. 120/208Y. 2400/120=20amps X 125%(continuous load)=25A. SO...30A breaker on #10THHN should work BUT if every 3 circuits share neutral, and all circuits are the same(balanced), what current will my neutral carry? And should I upsize each branch circuit neutral do to harmonics?
