We have installed a 3 phase, 3 wire, 480 V motor control center. This motor control center is fed from a 1600 kVA transformer (primary: delta and secondary: star), with a voltage ratio of 4160 V/480 V and we have a high resistance grounding system. Therefore the neutral bus is not run inside the MCC.
My query is as:
I have a single phase loads requiring 277 V supply. I would like to know whether I can form a neutral bus inside the MCC and provide 277 V from one of the phase and this neutral (which is a high resistance grounding)?
Is this permitted by NEC or any other standard?
Your early response will be appreciated.
Thank you in advance.
Sudheendra
My query is as:
I have a single phase loads requiring 277 V supply. I would like to know whether I can form a neutral bus inside the MCC and provide 277 V from one of the phase and this neutral (which is a high resistance grounding)?
Is this permitted by NEC or any other standard?
Your early response will be appreciated.
Thank you in advance.
Sudheendra