works contract for day to day preventive and breakdown maintenance including emergency breakdown at night hours of 765kv, 400kv, 230kv and 110kv eht lines in respect of sriperumbudur lines section under the control of executive engineer / operation / 400kv ss / sriperumbudur and the work inside the switchyard of the substation during maintenance or for attending to other sub-station related works or other works as per requirement of and as directed by the engineer / officer in-charge for a period of 2 years from the date of utilization.; 1 fitter i class 2 mazdoor category ii 3 contractor service charges in % 4 hiring charges for 5 ton mini lorry 5 hiring charges for tractor 6 hiring charges for jcb 7 hiring charges for boat 8 t&p 9 insurance reimbursement