PV neutral 480v only

[zappedfh]

I have a 87 kw pv system that i have installed.The problem is i need a neutral for communication only the service in the area is 480 only no neutral available .I pipe over to a panel that was 277 with a neutral.there is no current from the neutral.i know the code says all conductors shall be in the same conduit.The electrical inspector passed it but the building electrician won't allow it .any ideas

 

[ggunn]

I have a 87 kw pv system that i have installed.The problem is i need a neutral for communication only the service in the area is 480 only no neutral available .I pipe over to a panel that was 277 with a neutral.there is no current from the neutral.i know the code says all conductors shall be in the same conduit.The electrical inspector passed it but the building electrician won't allow it .any ideas

Is the 480 delta from a separate transformer from the 480/277Y? If so, I don't think you can bring the neutral from the wye over to the delta if that is what you are suggesting. After the installation is completed is a crummy time to be finding this out.

 

[Engineer#4827502]

Is this a communication system over the AC conductors? Is a neutral required for metering voltage reference? Or is a 277V source needed for communication equipment?

 

[jaggedben]

.. Is a neutral required for metering voltage reference? ...

I would bet it's this, for meeting UL 1741.

I'm assuming he's already looked into the possibility that the inverter can be configured to not require the neutral.

 

[zappedfh]

solar neutral

solar neutral

The neutral is needed in the inverters only for the monitoring system of the inverters.Not over the ac line.They need 277v to hook into the internet the inverters are an SMA tri power .SMA will not let me install control transformer on the inverters.So i went back to the 277v panel to make the system work.Again the inspector passed it said a neutral is a neutral coming from the same source.Any help would be appreciated

 

[Engineer#4827502]

Does the data module have its own terminals for the 277V? Could you run a hot & neutral from the 277 panel on a separate circuit just to power the data module?

 

[ggunn]

SMA will not let me install control transformer on the inverters.

What does that mean?