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How to Wire 277V & 480V, 1 & 3-Phase Main Service Panel?
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How to Wire a Multi-tap Transformer - Functional Devices, Inc.
208 To 480 Step Up Transformer
L/C Magnetics: Three Primary Tapped Transformer, 12 KVA, P/N 18852N
How to Wire 277V & 480V, 1 & 3-Phase Main Service Panel?