A 400A 3-phase 4-wire 277/480V distribution switchboard designated HVA feeds multiple motor loads including VRV units at 36A and 15A protected by varying amperage switch disconnects and circuit breakers, alongside smoke fan, roof fan, and telecom equipment. Feeders utilize specific conduit and wire sizes such as three #6 conductors plus one #10 ground in three-quarter-inch conduit for 50A circuits, and three #10 conductors plus one #10 ground for 25A circuits. A 75kVA dry-type transformer steps down 480V to 120/208V to feed panel RP via a 225A 3P main breaker and a 90A primary breaker. Grounding is provided via a half-inch conduit with one #2 copper ground connected to earth.
Members view this detail in full resolution, download the CAD files (SVG, PDF), and can adapt it in the built-in CAD editor — export DXF, DWG, or PDF.
Start membership