To wire a 3-phase 480V transformer, first ensure the power is off. Identify the primary and secondary terminals on the transformer. Connect the three-phase supply lines (L1, L2, L3) to the primary terminals, ensuring correct phase sequence. For the secondary side, connect the output terminals to the load, following the required voltage configuration (delta or wye). Use appropriate wire sizes and fuses for safety, and ensure all connections are secure and insulated. Always follow local electrical codes.
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