routine , preventive and breakdown maintenance excluding cost of major materials and transformer oil , non comprehensive operation ( excluding major materials and transformer oil ) & all routine , preventive , and , running maintenance works as required from time to time for complete sub station equipment comprising h . t . panels , transformers , l . tpanels , risingmains , power cables , internal & external electrical wiring upto load end & installations by providing 3 ( three ) nos skilled &3 ( three ) nos semi-skilled workers in total . 1st shift: 7am to 3pm ;skilled 01 +semi- skilled01no . 2nd shift:1pm to 9pm;skilled 01 +semi- skilled01no . ( for ballygunge science college & allied campuses , hostels ) and general shift:10am to6am:skilled 01 +semi skilled01 ( for v . l college of home science & nutrition & its allied hostels ) ( note: agency provided supervisor must have minimum one year experience of similar nature of works & scc parts of 1 , 2 , 3 , 4 , 5 , 6a , 6b , 7a , 7b , 9 , 10 , 11 , 12 who will supervise the whole maintenance work . ) capacity of transformers:1 ) 1x750kva oil type 2 ) 1x 1000kva dry type ( as per nit documents )