jrannis
Senior Member
- Location
- Fort Lauderdale/ Miami
We have a project with a 600 amp main breaker ATS. Each supply side has parallel 350kcmil including the neutral with 2/0 on the high leg. This is an older installation and I suspect that the original install was a fused main but, this may not be the case.
The load side has the same conductor sizes distributed in a load gutter to four small disconnects and lighting panels.
The commercial facility, about 5,000 sf has 3ph air conditioning equipment, a small kitchen and minimal lighting and normal receptacle loads as in nothing remarkable beyond what you may find in a house.
The historical load on the building is in the 50kw range due to the 3 phase loads.
Question here is this. What would be the minimum size neutral that can be used here?
It had been suggested that someone possibly swapped the high leg and neutral conductors during the original install as the smaller high leg is landed on the 600 amp.
Any thoughts on this theory?
The load side has the same conductor sizes distributed in a load gutter to four small disconnects and lighting panels.
The commercial facility, about 5,000 sf has 3ph air conditioning equipment, a small kitchen and minimal lighting and normal receptacle loads as in nothing remarkable beyond what you may find in a house.
The historical load on the building is in the 50kw range due to the 3 phase loads.
Question here is this. What would be the minimum size neutral that can be used here?
It had been suggested that someone possibly swapped the high leg and neutral conductors during the original install as the smaller high leg is landed on the 600 amp.
Any thoughts on this theory?