1200A main switchboard · 6 tenant sub-panels · ATS for emergency
Six-tenant commercial office building with 1200A main switchboard at 208Y/120V. ATS feeds emergency lighting and exit signs. Each tenant sub-panel sized to NEC 220.11 lighting demand and NEC 220.42 receptacle demand. Feeder conductors sized per NEC 215.2.
1200AService
72Circuits
208Y/120VVoltage
NEC Art. 215/220Code
< 3 minRuntime
OfficeMulti-tenantATSEmergency208VSub-panels
Downloads — Email required (free)
Panel Schedule PDF
All 6 sub-panels + main switchboard summary
Load Calculation Worksheet
Per-tenant demand + aggregate service load
Feeder + Cable BOM
Feeder sizing for all sub-panels
One-Line Diagram
Switchboard, sub-panels, ATS, feeder ratings
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