Hospital essential electrical system single line diagram
This critical power single line diagram shows a hospital essential electrical system at 480Y/277V. A 13.2 kV utility service feeds the normal switchgear through a 2500 kVA transformer, while two 1000 kW generators connect to common paralleling gear. Separate automatic transfer switches serve the life-safety and equipment branches.
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Scenario
This diagram shows a hospital’s essential electrical system, where two generators support distinct life-safety and equipment branches after a utility failure.
Key decisions
- Paralleled generators: Two 1000 kW units feed common paralleling gear for source redundancy.
- Separate ATS branches: Life-safety and equipment loads transfer independently at their rated switches.
- Life-safety loads: Egress lighting and the fire pump stay on a dedicated branch.
- Clinical continuity: ICU and operating-room loads receive the equipment branch.
- Smoke control: A dedicated motor feeder preserves smoke-management capability.
When to reuse this
Use this for a hospital with generator-paralleling gear and branch separation. Detailed generator controls and branch-circuit schedules belong on companion drawings.
Frequently asked questions
Why are there two hospital transfer switches?
What does generator paralleling gear do?
Does this show all hospital branches?
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