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If the transformer is designed as a step up, are the ``H`` terminals the primary or the secondary?

The ``H`` terminals are always on the coil with the highest maximum line-to-line voltage, and the ``X`` terminals are always on the lower, regardless of which coil is designed to be connected to the source. Per the NEC, the side of the transformer connected to the source is always the primary, regardless of the design of the transformer.

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