installation and commissioning of a substation at 3l 5nd including lowering of all materials through shaft like tsu switches and cables at rviia seam of kumardihi a colliery.-item description/ heading 2 dismentaling of primary, secondary breaker from tsu part and transporting all part from electrical shed to pit top. 3 dismentaling of cage and removing from the place to insert the tsu, tying the tsu with the chain and lowering through shaft and then refitting of cage after lowering the same. 4 transporting of tsu part from pit bottom to substation site of rviia ( 2 pillar rail then 4 pillar manual ) 5 transporting of primary 3.3 kv breaker of tsu, one 3.3 kv switch, secondary 550v breaker of tsu, 2 nos. of 550v breaker including of one lighting transformer total 6 equipments 6 lowering of 95 sq. mm cable of 250 meter and 150 meter of 35 armoured cable from surface to substation and laying of the same. 7 total impact of gst for the purpose of ctc