Using single-phase transformers to create 3-phase systems.

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Many older industrial facilities use single-phase, oil-filled transformers made for pole-mounting but installed at ground level to create 3-phase power distribution systems. Usually, primary and secondary "bus" conductors are strung open between wood poles. Beneath these conductors are the transformers or "tubs." Open conductor drops are run from the bus conductors to the tubs' primaries and secondaries,

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