[SUMPNER TEST ( BACK TO BACK ) TEST ON TWO IDENTICAL TTRANSFORMER COMPLETE SET UP WITH PANEL BOARD WITH BUILT IN VARIABLE SUPPLY ARRANGEMENT, TWO 1KVA TRANSFORMERS & TWO WATTMETERS.] SUMPNER TEST ( BACK TO BACK ) TEST ON TWO IDENTICAL TRANSFORMERS COMPLETE SET UP WITH PANEL BOARD WITH BUILT IN VARIABLE SUPPLY ARRANGEMENT, TWO 1KVA TRANSFORMERS & TWO WATTMETERS – GUPTA BRAND ( 100000003 )