Interconnection at Apartment Complex

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pv_n00b

Senior Member
Location
CA, USA
The NEC considers the 600A disco the service disconnect since there are more than 6 tenant disconnects and a house disconnect. But the OP said the utility does not want a separate production meter so meters are going to have to be back fed. Most multi-meter panels can't be tapped between the meter and the downstream CB. The PV system is too large to back feed any single meter. The OP has not be specific about what meters will be back fed so it's hard to provide further guidance. Most likely the OP is looking at an expensive panel upgrade, talking the utility into a production meter, or dropping down the size of the system.
 

ggunn

PE (Electrical), NABCEP certified
Location
Austin, TX, USA
Occupation
Electrical Engineer - Photovoltaic Systems
You are right about that. The only things that count for 120% rule are the 600A OCPD, the bus rating (not known yet) and the PV amperage. The house and tenant breakers are not relevant.
That assumes that the 600A disconnect really is considered by POCO to be the service disconnect.
One more factor is the capacity of the transformer feeding the service, but for a 24 unit complex it is not likely to be less than 1.25 X 168A.
 

pv_n00b

Senior Member
Location
CA, USA
This is the problem about trying to design something in the forum. If we saw the single line of the existing system we would not have to spend all this time asking questions like, is there a fuse in that disconnect? Most of this thread has been speculation about what the existing system looks like and what does the OP really want to do.
 

jaggedben

Senior Member
Location
Northern California
Occupation
Solar and Energy Storage Installer
I'm just raising questions because I think meter banks are really vague territory for questions relating to 705. Even if the OP showed us the line diagram, there could still be uncertainties and it would be best advice to ask the AHJ and Poco.
 
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