I have an industrial project that is all 3ph loads - no single phase loads. The utility supplies the primary side of a 2500kva xfmr with a 480V 3ph secondary with the center grounded at the xfmr.
The initial design is to run parallel phase conductors but no neutral since we have no single phase loads. Is this acceptable? I'm considering this a separately derived source because of the xfmr 250.20(D).
If it does not qualify as a separately derived source then I presume 250.25(C) applies and I have to run the neutral per Table 250.102(c)(1).
Do I need a neutral bus in the switchgear? It looks like 250.25(C) says I just need a neutral terminal.
The initial design is to run parallel phase conductors but no neutral since we have no single phase loads. Is this acceptable? I'm considering this a separately derived source because of the xfmr 250.20(D).
If it does not qualify as a separately derived source then I presume 250.25(C) applies and I have to run the neutral per Table 250.102(c)(1).
Do I need a neutral bus in the switchgear? It looks like 250.25(C) says I just need a neutral terminal.