supply of supply, erection, testing & commissioning of 500 kva outdoor, plinth mounted, oil immersed, non-sealed type (transformer tank body and cover are bolted) distribution transformer, 500 kva rating, 11kv/415v, 3-phase, 50 hz, primary winding in delta and secondary winding in star (vector symbol- dyn11), onan cooled, off-load tap changer for variation of hv voltage from +5% to -10% in steps of 2.5%, with all standard fittings as per clause 20.1 of is 1180 (part 1) and oil temperature indicator & winding temperature indicators, drain-cum- sampling valve (3/4? nominal size thread,is:554) of steel with plug, energy efficiency level- 3 & above, conforming to is 1180 (part 1): 2014 with amendment nos. 1,2,3 & 4. following has to be submitted along with supply of material:- (i) type test report as per is: 1180 (part 1) of transformer having same rating, make (& model if any) and design from nabl accredited lab. (ii) routine test certificates as per is: 1180 (part 1). (iii) special test certificates as per clause 21.4 sl. no. (a), (c), (d) & (e) of is:1180 (part 1) accepted make : andrew yule/aeg/crompton greaves/kirloskar electric co./abb /siemens/ schneider electric or equivalent.supply, erection, testing & commissioning of 500 kva outdoor, plinth mounted, oil immersed, non-sealed type (transformer tank body and cover are bolted) distribution transformer, 500 kva rating, 11kv/415v, 3-phase, 50 hz, primary winding in delta and secondary winding in star (vector symbol- dyn11), onan cooled, off-load tap changer for variation of hv voltage from +5% to -10% in steps of 2.5%, with all standard fittings as per clause 20.1 of is 1180 (part 1) and oil temperature indicator & winding temperature indicators, drain-cum- sampling valve (3/4? nominal size thread,is:554) of steel with plug, energy efficiency level- 3 & above, conforming to is 1180 (part 1): 2014 with amendment nos. 1,2,3 & 4. following has to be submitted along with supply of material:- (i) type test report as per