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Auto Transformers in Commercial Building Feeds: A Guide to Long Duty Cycles Power gear may seem simple until a fault stops work. In commercial building feeds, each choice should fit the real load, space, and supply. Building feeds can include gear with unlike input ratings. A well sized autotransformer is only part of the answer. The wire plan, heat, guards, and tests must also fit the way the site runs. The input and output are linked by a shared winding, so it