supply , installation , testing and commissioning of ups and pwcamc charges for three years with buy back option , list of item ( s ) / work ( s ) as per tender documents , supply of the following 3 nos . of uninterruptible power system ( ups ) panels to bongaigaon refinery including its testing and commissioning along with supervision of installation of all ups & allied equipments as per technical terms and conditions mentioned in tender document:item 10 . 10 - 2x25 kva parallel redundant ups for stg davr without battery bank and acdb ( buy-back - applicable ) item 10 . 20 - 2x15 kva parallel redundant ups for n2 plant without battery bank and acdb ( buy-back - applicable ) item 10 . 30 - 2x25 kva parallel redundant ups for s/s-31 with ni-cd battery bank and acdb ( buy-back - not applicable ) , post warranty non-comprehensive amc of 3 nos . above ups systems for a period of three years as per detailed scope of work mentioned in annexure- 1 , 10 , 11 & 12 of tender document , noncmp amc 2nos . 25kva ups for 1st year , noncmp amc 2nos . 25kva ups for 2nd year , noncmp amc 2nos . 25kva ups for 3rd year , noncmp amc 1no . 15kva ups for 1st year , noncmp amc 1no . 15kva ups for 2nd year , noncmp amc 1no . 15kva ups for 3rd year , buy back of existing ups system