supply of different type 11kv ct and pt of different ratio for consumer metering , electrical items : , 11 kv epoxy resin cast single ratio dry type ct as per is-2705/1992 with amendments having accuracy class 0 . 5 burdon-10va frequency -50hz/nominal system voltage 11 kv highest system voltage 28 kv & 3kv respectively fro primary and secondary primary terminall ( pi&p2 ) and secondary terminal ( s1&s2 ) shall be clearely embossed/molded type division code etds-upcl should be embossed/molded type surface of ct for consumer metering with serarately cartoon box packing , 11 kv/110 v pt for metering purpose epoxy resin cast dry type accuracy class 0 . 5 burden-20va frequency -50hz . transformation ratio 11 kv/110volt nominal system 11 kv highest system voltage 12 kv no . of three phase tree limb type marking should be permanent and clearely upcl etds embosed/molded on surface of pt as per is with wooden packing per no .