supply of 11kv ct and pt supply of 11kv ct and pt with different ratio , 11 kv epoxy resin cast single ratio dry ct as per is-2705 / 1992 with accuracy class 0.5 burden 10va frequancy 50hz / normal system voltage 11 kv highest system voltage 28 kv& 3 kv respectively primary & secondry terminal ( s1 & s2 ) shall be clearly embossed / molded type with division code etdt-upcl should be embossed / molded type ct connection patti thickness minimum 5 mm ( + / -1mm ) surface for ct for consumer metering with seprately cartoon box packing. , 11 kv ct 5 / 5 for consumer end , 11 kv ct 10 / 5 for consumerend , 11 kv ct 15 / 5 for consumerend , 11 kv ct 20 / 5 for consumerend , 11 kv ct 25 / 5 for consumerend , 11 kv ct 40 / 5 for consumerend , 11 kv / 110 v pt for metering purpose epoxy resin cast dry type accuracy class 0.5 burden-20va frequency -50hz. transformation ratio 11kv / 110volt nominal system 11 kv highest system voltage 12 kv no.of three phase three limb type marking should be premanent and clearly upcl etdt embosed / molded on surface of pt with wooden packing per no. minimum weight accepted 41 kg or more