An electrical distribution riser diagram showing power flow from main switchboard feeds MSB-1, MSB-2, and MSB-3 to panels Y1, Y2, X, and V. Step-down transformers XFMR TB, XFMR TC, and XFMR TD convert 480V to 120/208V with capacities of 75kVA and 45kVA in 3-phase 4-wire configurations. Secondary feeders run from the transformers to downstream distribution panels B, C1, C2, and D.
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