This ain't a House where 100% Neutral may apply .
Read 250.21 (c) 1 & 2 What does it say. Reduced neutrals are installed all over Most because a Y requires a Neutral even if its not going to be used for grounding purposes.
As far as Harmonics this is not a schoolfull of computors and data switching equipment.If I have 500 amp load on the Neutral and I have it rated for 1600 amps I can't see the problemeven 500 x 175 % which on the loads I have WAS possible the neutral load even then would max out at 875 well below the 1600 amps.
Yoopers
