MAINT AND REPAIR/REPLACEMENT CABLE JOINTS AND LAYING OF CABLES AND CONNECTED MISC WORK FOR AIRFIELD MAINT AT AFS YELAHANKA

Excavation in trenches not exceeding 1.5 m wide and not exceeding 1.5 m in depth for taking out underground cables 1100/5KV, AFLC/LT /HT of different sizes from 6 Sqmm 3/4/2 core by excavation in soft / loose soil, removing bricks/ DWC/ HDPE pipe of any size and relaying in the same trenches or rerouting after rectification of fault complete all as specified and directed. Note:1. New LT cable for replacement of faulty cable in cable joint will be provided by user. 2. Retrieved old serviceable bricks will be laid in trenches for cable protection measured and paid separately under respective items of the schedule.

All as per ser No 1 above for hard/ dense soil.

Supply and laying unreinforced pre cast concrete cable cover class LV, Type I, flat, size 250mm x 150mm x 40mm for cable protection, made out of M-20 grade concrete, etc complete all as specified and directed.

Supply and spreading fine river sand in trenches for cushioning of underground cable complete all as specified and directed Note: - Only punned thickness 18 cm will be measured and paid.

Returning filling in including spreading, levelling, watering and well ramming in layers n-exc 25 cms complete all as specified and directed

Removing excavated soil to a distance n-exc 50 mtr and depositing where directed at a level n-exc 1.5 mtr above the starting point complete all as specified and directed.

M & L Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or draw in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc as required 4mm dia galvanised iron or steel wire complete all as specified and directed

M&L Earth continuity conductor or main earthing lead fixed to wall on batten or recess or chases or buried in ground or draw in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc as required but of size, 25x4mm galvanised iron strip complete all as specified and directed.

M&L for providing earthing chambers made up of PCC 1:2:4 type B1,(using 20mm graded stone aggregate) including necessary formwork over 75mm thick PCC bed, 1:3:6 type C2 (using 40mm graded stone aggregate) with provision of 10mm thick CI chamber cover with hinge all as per electrical plate no.3 of SSR part-I including demolition of old unserviceable earthing chamber complete all as specified and directed.

M&L for recharging of normal earth pits by excavating the earth at a radius of 600mm from the centre from the earth pit and at a depth of 900mm after removing the earth chambers and accessories carefully and keeping aside for reuse including adding and spreading Charcoal 10 Kg and Salt 10 Kg in 75mm layers each at ground level and watering, refixing the earth chambers and accessories after allowing the soil to settle down complete all as specified and directed.