Ambulatory Health Care Occupancy - Generator Sharing

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ron

ron

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I have a multi-tenant occupancy, where 20% will be a Ambulatory Health Care Occupancy (>150kVA Electrical service). The other 80% will have varied tenants such as movie theater, office space and Higher Education.

Since it is a High Rise and due to certain criteria, I need a generator for 700 and 701 loads (separate ATS for 700 and 701). Do I need a separate generator with three ATSs to support the Essential Electrical System of the Ambulatory Health Care Occupancy?

If I can share the same generator, obviously the size would grow to accommodate the loads, do I need (2) ATSs for 700 & 701 loads and three more for the Essential Electrical System of the Ambulatory Health Care Occupancy?
 
That's a good question. I would point out that hospitals typically have business offices and doctors office areas that are not essential to the hospitals operation. Those are probably more like business occupancies than a health care occupancy. And I believe these are typically put on the same ATS's as the hospitals essential electrical system.

517.26 says that the essential electrical system shall be per Article 700, except as amended by 517. And article 700 says the ATS shall be dedicated to Article 700 loads. Of course, that is amended by 517.30 which requires 3 separate ATS's for the health care facilities essential electrical systems.

But I believe the emergency egress lighting for the building can share the life safety ATS for the health care facility. Both types of loads are 700 loads, and both are basically egress lighting and emergency systems.

However, I believe the Article 701 loads (whatever they are) would require a 4th ATS, since they can't be combined with any 700 loads.
 
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