3phase 4 wire 110v , 5 / 1amp static tri-vector energy meters of 0 . 2s accuracy class suitable for summation metering . ( two no . feeder and summation unit ) , electrical items : , isi marked , class-0 . 2s , three phase four wire , 110 volt , 1amp . / 5amp . static ht tri-vector energy meter suitable for multi feeder summation metering application conforming to is:14697/1999 , iec:62053-22 and cbip report no . 325 , with its latest amendment and as per detailed technical specification given in annexure-vi ( a ) meeting all the minimum requirement specified in gtp appended in annexure vi ( b ) .