Electrical · E-Z9KBK

Electrical One-Line Diagram with Transformer and Distribution Panels

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An electrical one-line diagram details a 150 kVA three-phase four-wire dry-type transformer designated as X3A, stepping down 480 volts to 208Y/120 volts with a minimum impedance of 2.5 percent. The transformer feeds multiple electrical panels including a 200 amp main circuit breaker panel L3A, a 225 amp main lug only panel L3B, and a 400 amp main circuit breaker panel H3A. Feeder sizing, load currents, and circuit breaker ratings are indicated throughout the distribution path.

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