Check panel welding 4W3-1NH found output 220 VAC 3 units bad condition replace 3 units with spare unit and panel welding 4W3-1NC found output 220 VAC 1 unit bad condition no cover available replace use spare unit result ok normal. Also panel welding at 8th floor 443 PH1 found 1 unit output 22o VAC bad condition no cover available replace use spare unit and wiring 2 units output 220 VAC result normal ( EDI & ADI )