REPAIR/MAINTENANCE OF EARTHING, CONDUCTOR, LT PANEL, CHANGE OVER AND LIGHTING PROTECTION UNDER AOR OF AGE (I) NYOMA

Removing & refixing of air termination single pointed aluminium rod12mm dia and 300mm long size with necessary fixing arrangement on roof / ceiling after making good, complete all as specified and as directed by Engr-in-Charge.

S & F GI strip of size 32 x 6mm fixed to wall on batten or recess or chases or buried in ground or drawn in conduit / pipe or fixed to poles or any other indicated situation for loop earthing, complete all as specified and as directed by Engr-in-Charge.

Ditto- but using 4 mm dia galvanised or steel wire, complete all as specified and as directed by Engr-in-Charge.

S & F test point terminal block made of phosphorus bronze size 75 x 75 x 25 mm thick drilled and screwed including 3 Nos 8 mm dia 25 mm long hexagonal head screws fixed to copper strip bracket fixed to porcelain insulator in wall as in repairs, complete all as specified and as directed by Engr-in-Charge.

S & F vitreous china porcelain insulator with busbar support white type, complete all as specified and as directed by Engr-in-Charge.

M & L earthing complete for electrical equipments with galvanised steel earth plage electrode 60 cm x 60 cm x 6 mm buried directly in ground vertically to depth not less than 2.24 mtr below ground level with top edge earth plate at a depth not less than 1.5 mtr below ground level, connected to earth lead of GI strip size 32 x 6 mm by means of nuts, bolts, check nuts & washers made of galvanised iron or steel and connected to main switch board or main control board as directed charcoal or coke and salt in alternate layers, necessary excavation and earth work in hard/ dense soil coplete all other accessories as shown on electrical plate No 5 of MES SSR Part I including 50 mm bore light grade GI pipe 1.8 mtr length with top end covered with plug or cap for watering and 30 x 30 x 30 cm size PCC 1 : 3 : 6 block around watering pipe parallel to the existing earth, excluding 20 mm dia watering pipe, PCC, Watering pit, Funnel, Pit cover, complete all as specified and as directed by Engr-in-Charge.

M & L for pole earthing complete with galvanised steel earth plate electrode 60 cm x 60 cm x 6mm buried directly in ground vertically to depth not less than 2.25 mtr below ground level with top edge earth plate at a depth not less than 1.5 mtr below ground level, connected to galvanised earth lead wire 4.0mm dia by means of bolts,nuts, check nuts & washers made of galvanised iron or steel and connected to main switch borad or main control board as directed, charcoal or coke and salt in alternative layers, necessary excavation and earth work in hard / dense soil complete all other accessoreis as shown on electrical plate No 5 of MES Sch Pt I including 50 mm bore light grade 1.8 mtr length with top end covered with plug or cap for watering and 30 x 30 x 30 cm size PCC 1 : 3 : 6 block around watering pipe, excluding 20 mm dia watering pipe, PCC, watering pit, Funnel, Pit cover, complete all as specified and as directed by Engr-in-Charge.

M & L for testing of earthing except new earthing covered under 8 & 9 here in before of various OTM building, Installation and Pole etc in the presence of Enginer-in-charge & maintaining record of test seperately for each type of building/ installation and painting of earth result and date of testing in the wall / earth chamber, complete all as specified and as directed by Engr-in-Charge. Note : - Testing equipements and register shall be provided by the contractor and no extra payment shall be made for the same.

M & L for PCC ( 1 : 2 : 4) type B1, using (20 mm graded stone aggregate ) as in earth chamber as in repairs, complete all as specified and as directed by Engr-in-Charge.

Supply and lay 40 mm dia GI pipe light grade burried in trenches as earth continuity protection as in repairs, complete all as specified and as directed by Engr-in-Charge.