GE (AF) MC/CHD/T-62/2026-27

Material and labour for Maintenance of earthing including measurement of Earth resistance and earth to neutral voltage of earthing any type (Chemical/Conventional & Grid earthing) pertaining to various locations with proper calibration earth tester and recording the reading in a register and take appropriate action such as pouring of salt mixed water in earth pit, replacement of blocked rusted funnel, tightening the earth strip through nut, bolts and washers, replacing old rusted worn out nuts and bolts with new complete all as specified and directed. Note (i) :- The Contractor or his rep will attend the office of AGE E/M (AF) MC Chandigarh in domestic area of 3 BRD AF Chd daily for collection of complaint slip at 0900 hrs. (ii) The Contractor must provide manpower (one skilled and one unskilled) to carry out earth pit resistance check of each section of entire 3BRD including electric sub stations and DG Sets every month (approximate No. of earthing is 2500) and will enter the value of each earth pit once in a month and obtain signature of user rep as well as JE E/M.

(iii) The earth resistance checking equipment including all necessary T&P items shall be provided by the contractor and the cost of the same to be included in the quoted rate. (iv) The cost of material such as funnel, common salt, charcoal, magnesium sulphate (MgSO4) etc will be paid under relevant item of this schedule as supply only however the cost of nut bolts shall deemed to be included in the quoted rate.

Supply and fix in replacement Precast (Factory Manufactured) Earthing pit of size 300 mm x 300 mm x 300 mm with 50 mm thickness with Mortar design precast Pit cover, earth work complete, PCC at bottom at 25 mm thickness including taking down old pit cover and earth work complete all as specified. Make - Venus/ Balaji / Veraizen or any other Precast RCC manufacturer.

M&L for cleaning all unwanted vegetation from surrounding of earth pit, within the radius of 1 Metre apart, cleaning inner side and out side of earthing pit complete all as directed.

Supply and fix in replacement for earthing pit funnel and repair to earth pit with wire mesh, PCC (1:3:6), type C-1 chamber, pit cover of precast RCC (1:2:4), type B-1 reinforced XPM of weight not less than 4 Kg/Sqm and plaster work inner or outer etc, complete all as specified.

Supply only common salt for mixing with water for earthing pit complete all as specified and directed.

Supply only Charcoal for earthing pit complete all as specified and directed.

Supply only Magnesium Sulphate (MgSo4) for earthing pit complete all as specified and directed.

S&F earth marker made out of MS/GI Plate of size 3 mm thick , of Surface area upto 300 Sqcm of Rectangular/Round/Triangle shape duly revited with angle iron of size 25 x4 mm, 60 cm long to indicating earth result, date, due date including PCC 1:2:4 Type B2 using 20 mm aggregate for grouting the marker all as specified and directed by Engr-in-Charge.

Supply Installation Testing & Commissioning of Ring Earth Pit which includes the Installation of following :- (a) Digging /Auguring /Boring of Five Single Earth Pits of 100 mm to 125 mm. Dia to the depth of approx. 2.8 metre. (b) Insertion of 17.2mm x 3000mm Earth Electrode of low carbon steel with molecularly bonding of electrolytic grade copper coating (purity 99.9%) having min. 250 microns thickness shall comply with Specification IEE 80- 2013 & IS 3043-2018 and penetrating it at least 0.2 metre by pushing gently with sledge hammer where the natural soil is assumed for all five pits. (c) Filling of Earth pit with Earth Enhancement Compound (ITPC-EECP15) in slurry form and back filling. (d) Job of Exothermic Welding Material for bonding the earth system shall be as per RDSO specs, which includes graphite moulds, clamps weld metal powders. (e) Carrying out exothermic weld connection job on the single earth electrode to a copper tape of 150 x 25 x 6 mm. (f) MEEB of size 300 x 25 x 6 mm is to be fixed inside the equipment room with two insulation studs. (g) 300 x 300 x 300 mm (inside dimension) concrete Earth Pit with a concrete lid, approx. 50 mm thick with pulling hooks, shall be provided to cover the pit. Back side of the cover will be painted in black and date of the testing and average resistance value shall be written.