“Draw a hospital emergency power single-line diagram with a 13.8 kV utility transformer and normal 480 V switchboard, a 1500 kW generator, and life-safety, critical, and equipment branch ATS units feeding their named loads.”
Read the decisions behind it.
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.
This is a high-level hospital emergency power topology. Generator capacity, transfer timing, and branch classifications require jurisdiction-specific healthcare electrical design.
Other examples in this family.
Common questions
Why are there three ATS units?
They keep life safety, critical, and equipment loads in distinct emergency branches.
What is the critical branch?
It supports selected patient-care functions such as ICU and operating rooms.
Does this show all required hospital equipment?
No. It is a simplified power topology, not a complete facility design.