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1) I assume that the UPS was only providing backup power to the rack and the UPS was fed from a dedicated circuit, correct?
2) Have you confirmed with any other nearby businesses if they encountered an outage during the same time period?
3) Does the building only contain one main panel or are there multiple sub-panels installed? If sub-panels are installed, does the UPS circuit originate from a sub-panel or from the main panel?
4) Does the lighting also originate from the same panel as the UPS circuit?