hospitals - Life Safety vs Critical
Reviewing a set of drawings for a hospital that has two isolated breakers at the emergency generator. One goes to an Equipment ATS (450A) and the other goes to a DP. The DP then feeds a Critical ATS and a Life Safety ATS.
In reviewing 517.30 it strikes me that this is taking a liberty with the code. If the system is less than 150KVA you could go to a single ATS, but I don't see anywhere where they permit the arrangement so described above. What do you think?
Also when 517 talks about systems smaller than 150kVA, are they talking about the Life safety and Critical systems combined? Or is this inclusive of the equipment load as well?
Mike Shields, PE