UNIVERSITY
University student residence electrical system single line diagram
This university building single line diagram represents a student residence hall supplied from a 13.8 kV campus distribution system. A 1500 kVA transformer and 2500 A main breaker feed the 480Y/277 V residence switchboard. Separate feeders serve student room panels, a dining kitchen, and laundry equipment.
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CASE ANALYSIS
Scenario
This residence hall separates everyday room, kitchen, and laundry demand from generator-backed fire alarm and egress lighting services.
Key decisions
- Campus supply: A 1500 kVA transformer feeds the residence switchboard from campus distribution.
- Residential feeders: Room panels, dining kitchen, and laundry have separate normal feeders.
- Emergency source: A 350 kW generator connects through an 800 A life-safety ATS.
- Life-safety loads: Fire alarm and egress lighting are supplied from the emergency bus.
When to reuse this
Use this for a university residence hall with a life-safety generator. Add elevator, fire-pump, and occupancy-specific loads where required.
FAQ
Frequently asked questions
Why are fire alarm and egress lighting on the emergency bus?
They must remain available during a normal-source outage for occupant safety and evacuation.
Can the generator also serve room loads?
It can if designed for that duty, but this example reserves it for life-safety loads.
Why separate dining and laundry feeders?
Both are concentrated high-demand areas that are easier to size and maintain as independent feeders.
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