Electrical · E-EBG6N

Electrical Service One-Line Diagram with Transformer and Meter Stack

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An electrical one-line diagram details the service entrance and distribution system originating from a new vault-mounted transformer. The system feeds a 2000A, 277/480V, 3-phase, 4-wire service entrance switchboard with a NEMA 3R enclosure and 65KAIC rating, grounded per NEC Article 250. The switchboard includes a house panel and metered feeds for Unit #1 through Unit #5 with dedicated 400A and 200A 3-pole breakers. Additional distribution paths extend to separate transformer and panel assemblies, including 75KVA step-down transformers supplying 120/208V panels, along with stubbed conduits serving future tenant spaces.

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