procurement of 3-phase , 4-wires , dlms compliant , lt static trivector meters of accuracy class 0 . 5s of assorted ratings procurement of 3-phase , 4-wires , dlms compliant , lt static trivector meters of accuracy class 0 . 5s of assorted ratings against t . e . ce ( mm ) 15 / 2020 , isi marked , 3-phase , 4-wire , ct ( s ) operated lt static trivector meters ( dlms compliant ) of accuracy class 0 . 5s with cts of following capacity , with metal meter boxes and wiring:- , 50 / 5 ampere , 100 / 5 ampere , 200 / 5 ampere , 300 / 5 ampere , 400 / 5 ampere , 500 / 5 ampere , 600 / 5 ampere , 1000 / 5 ampere , isi marked , 3 phase , 3 / 4 wire , ct-pt operated ht static trivector meters ( dlms compliant ) of accuracy class 0 . 5s , system of capacities - / 110 volts & ct ratio - / 5 ampere of following categories:- , category b meters ( bi-directional ) - with rs 232 port . , category b meters ( bi-directional ) - with rs 485 port . , category c meters ( uni-directional ) - with rs 232 port . , category c meters ( uni-directional ) - with rs 485 port .