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How to wire 277v & 480v, 1 & 3-phase main service panel?
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Transformer Wiring Diagram 480 To 240 - Wiring Diagram
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Three Phase Transformer Connections and Basics
How to Wire 277V & 480V, 1 & 3-Phase Main Service Panel?
45 Kva Transformer Wiring Diagram Gallery - Wiring Diagram Sample
Wiring-up a 3-phase transformer [X-post from /r/Electricians] : r