Hospital emergency power switchgear
This hospital emergency power single line diagram separates normal and generator sources from the emergency branches they support. Utility power arrives through a 13.8 kV to 480 V transformer and normal switchboard. A 1500 kW generator feeds the alternate source side of three automatic transfer switches serving life safety, critical care, and equipment loads.
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Scenario
A hospital separates emergency loads into life safety, critical care, and equipment branches supplied through distinct transfer switches.
Key decisions
- Normal utility power feeds all three ATS normal inputs.
- The 1500 kW generator has a dedicated 2500 A breaker.
- Each branch has its own ATS and rating.
- Egress/fire alarm, clinical, and mechanical loads remain visibly separated.
When to reuse this
This is a high-level hospital emergency power topology. Generator capacity, transfer timing, and branch classifications require jurisdiction-specific healthcare electrical design.
Frequently asked questions
Why are there three ATS units?
What is the critical branch?
Does this show all required hospital equipment?
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