I have an application that have the following parameters. Please advice.
500 KVA Pad-mounted transformer, 4160V-480/277V, Secondary connect to MLO Main Distribution Switchboard "MSB" rated at 1200A.
Disconnect TX-Secondary to MSB. Tapping off secondary of transfomer to a service rated ATS at 1200A with built-in GFI circuit breaker. Normal size of ATS will connect to MSB. Emergengy size will connect to gen set.
Gen set will be 200KW at 480/277V, natural gas, outdoor.
230.82(5) allow standby power to be connect to the supply side of main service disconnect. Please correct me if i am wrong, as long as the ATS is service rated and have main disconnect, this is legal by code.
Here is where it is get shady. Since this is an automatic transfer operation, 702.4 required that the standby equipment have to be able to handle "full load" or has "load management" built in to automatically manage the connected load. Our measured data is at about 100 kW peak (conducts 5days) for 1200A service.
What is consider "full load" ? Is it the entire 500KVA (TX rating)? If so, does that mean i have to put in a gen set to match this 500KVA rating; or is the "full load" the peak measure load ?
In the event we can't up size the generator to match the transformer size, What is consider "Load Management"? Any generator manufacturer offer this solution?