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I'm trying to get help with the secondary side of a industrial control XFMR. The primary side is 380V 1P. The secondary has two taps. One for 115V and one for 230V. I need to tap off of both. Do I ground one side of the 230V or leave it ungrounded. I know to ground the one side of the 115V side. If the one side of the 230V gets grounded can I connect the grounded side of the 230V to the grounded side of the 115V? Thanks for any help