I am working on a project where we have a single generator that will serve multiple buildings on a college campus. These buildings are all new construction. Currently the generator only serves a single building's life safety loads and central plant equipment. The generator was designed with a spare breaker for connection to a future building. The generator feeds (2) 3-pole automatic transfer switches. It was recently brought to my attention that this may be a code violation and 4-pole transfer switches may be required. Can anyone reference the code section that this would be in violation of? And if so, is there a solution where the 3-pole ATS's can remain in place?