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480/277V Transformer Connect to 120/208V Panelboard
You shouldn't be trying to connect the transformer to the panel board. You should be trying to connect the panel board to the transformer.
The "circuit" will need to have the transformer as the "parent" element and the panel board as the child element in this case. The transformer can also be connected to a "parent" panelboard, but that panel would need to be 480V.
