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In the Electrical Engineer, select the load for which you want to change the alternative supply. You can only change the alternative supply if you select the item at the lowest level of the branch.
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Right-click the load.
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On the shortcut menu, select Change Alternative Power Source.
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On the dialog that opens, navigate to the item that you want to designate as the alternative supply. If the item is not visible in the window, select a branch and select Expand. Alternatively, select Find to locate the item using the Find dialog.
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Select OK to select the item as the alternative power supply.