Office Building Riser: Main Switchboard, Feeders and Available Fault Current

A riser diagram of a 480Y/277 V, 1,000 A main switchboard with 20.1 kA available fault current feeding HVAC, lighting and elevator panels and a 225 kVA transformer to a 208Y/120 V distribution panel at 9.9 kA, with a fault table and notes.