Neutral in a UPS setup

[Eclair]

Hi everyone

I have a UPS system that goes that way:

Inverter:
600V-120/208V transformer 3 wires going through a 3 pole breaker that makes the input of the UPS.

bypass:
600V-120/208V transformer 4 wire going through a 3 pole breaker that makes the input of the bypass. The neutral is not going through the breaker.

The bypass neutral is what that makes the neutral of the inverter at the output of the UPS.

My question: Does the neutral have to go through the breaker (4 pole breaker)?

I do know that the neutral cannot be wired alone and must be included into the 3 phase wire.

Thanks!

 

[alehman]

The neutral should not go through the breaker. Otherwise the UPS output will loose its ground reference if the breaker opens.