AMC OF EXISTING EARTHING PITS OF TECHNICAL INFRA AND MISC WORK AT AF STN AWANTIPUR

Amount

M&L for Earthing complete with Copper earth plate 600 x 600 x 3.15 mm thick buried directly in ground (earth pit not less that 2.25 mtr deep below ground level) with top edge of the plate not less than 1.5mr below normal ground level connected to 20x3 mm Cu strip as earthing lead by means of brazing after tighten by bolts, nuts, check nuts and washers from earth pit to test point with protection GI pipe of size 50mm dia light grade and providing masonry enclosure including watering GI pipe (medium grade) 20 mm bore from bottom of earth pit to top of electrode and 20 mm GI pipe light grade for earth strip protection complete with earth pit pit covers of 300mm x 300 mm made of cast iron including painting as per color coding as per IS,in PCC 1:2:4 type B0 using 12 mm graded crushed stone aggregate, RCC cover, funnel, wire mesh including necessary excavation and earth work in any type of soil, returning filling in and removal of surplus soil complete all as specified, complete as specifed and directed.

M&L for brazing in repair work for GI strip not exceeding 3.2 cm in length and not exceeding 6 mm in thickness complete all as specified.

M&L for brazing in repair work for copper strip not exceeding 3.2 cm in length and not exceeding 6 mm in thickness complete all as specified.

S&F in replacement of saddle/insulator for strip with fixing arrangement in roof/wall of building having configuration upto G+5 for run of strips on it complete all as specified and directed.

Refixing only of strip (serviceable strips as obtained from taking down) of any type & size but including saddles/insulators with screws for fixing complete all as specified.

S&F aluminium strip 25x3.15 mm with saddles/insulators, complete with fixing screws for roof/down conductors/main earthing lead, including bracing/jointing and nut bolts jointing at all joints complete all as specified.

S&F copper strip 32 x 6 mm earthing lead laid in trenches/GI pipe for making grid/loop of earthing pit complete all as required at site all as specified and directed by Engr-in-charge.

S&F copper strip 20x3.15 mm with saddles/insulators, complete with fixing screws for roof/down conductors/main earthing lead, including bracing and nut bolts jointing at all joints complete all as specified.

S&F galvanized iron strip 25x4 mm with saddles/insulators, complete with fixing screws for roof/down conductors/main earthing lead, including bracing/welding and nut bolts jointing at all joints complete all as specified.

Taking down the existing aluminium/copper strip of any size and type from the top of blast pens/ground/equipment/bldg (roof/down conductor) and keeping in safe custody (for serviceable strips to re-use ) complete all as specified and directed.

M&L for Test point terminal block for earthing made of gun metal or phosphorus bronze size 75x75x25mm driled and srewed including 3 nos 8mm dia 25mm long hex head srew,complete as specified and directed.

M&L for plate earthing complete with galvanized mild steel plate electrode 60 cm x 60 cm x 6 mm thick buried directly in ground vertically (in earth pit not less than 2.25 meter deep below ground level) with the top edge of earth plate at a depth not less than 1.5 meter below normal ground level, the earth electrode surrounded by adequate quantity of charcoal dust and salt to a packed thickness of 15 cm on all sides and including GI wire 4 mm bolted (with GI nuts, bolts & check nuts) and riveted to earth (Plate) electrode at one end and connected to main switch board /panel/ test point at the other including watering GI pipe (medium grade) 20 mm bore from bottom of earth pit to top of electrode and 20 mm GI pipe light grade for earth strip protection complete with earth pit in PCC 1:2:4 type by using 12 mm graded crushed stone aggregate, RCC cover, funnel, wire mesh including necessary excavation and earth work in any type of soil, returning filling in and removal of surplus soil complete all as specified.

M&L for Chemical Earthing cum Maintenance free earthing system complete UL-467 approved copper earth plate 900mmx600mmx5mm( purity above 99%) burried in ground to vertically to a depth not less than 3.5m deep below ground level with top edge earth electrode at a depth not less than 500 mm below normal ground level , provision of copper bus plate of size 200 mm x 25mmx 6 mm for inter connection with copper earth lead strip 32mmx6 mm and further connected to test point terminal block of size 120 mm x 120 mmx 25 mm made of copper as directed by watering pipe light grade with CI/ MS funnel and wire mesh including excavation earth work in any type of soil and removil surplus soil to a distance not exceeding 50 m only, continuous copper strips/brazing to be used only including 45 Kg (minimum)NABL Lab certified backfill compound marconite for single bore holes soil mixed , alternate layers of conductive concrete resistivity of 0.001 Ohm & carbon based maintenance free compound (20 Kgs bagx5) make as per IEEE 80 2000, Clause 14.5 D Maintenance free earthing system to give earth resistance below 1 Ohms including excavation and earth work and earth to neutral voltage less than 2 volts, PCC chamber of PCC 1:3:6 type C-1 using 20 mm graded crushed stone aggregate with pit covers of 300mmx 300 mm made of cast iron including painting as per color coding as per IS,complete as specifed and directed.

Note for item 15 & 16:- (a) the rate shall include excavation of earth,removal of surplus soil and filling with back fill compound etc for completion of the job. (b) earthing resistance result should be less than 2 Ohm. If the result comes more than 2 Ohm, the contractor will be carried out the earthing in seperate location/site or as given by the engineer in charge after taking out of earth electrode all with out any extra cost to the department (c) the contractor will provide all the required and necessary certificates as per the specification for required items mentioned above from the same company before incorporting the same in the work as per engineer in charge. and the rep of the company should be avaliable at the site for the installation of the earthing as per their recommendation and specification to obtain the minimum resistance value. (d) testing equipment will be duly tested from authorized goverment.lab/CRPI lab and sealed by the testing authority and produce test certificate of testing equipment before testing for wich no extra payment shall be borne by the department (e) testing of earthing after completion of work will be carried out in presence of the GE, engineer in charge,rep of user and the contractor. (f) contractor/manufacturer will be provided the gurantee for earthing and result for the period of at least Two years.

M&L for dismantling of PCC earth pit chamber including excavate the old earthing and making PCC chamber of size as per electrical plate No. 3 of SSR-2009 Part-I with PCC (1:2:4) type B1 including RCC cover with suitable size of handle including excavation and earth work as required at site complete all as specified and directed by the Engineer-in-Charge.

S&F in replacement of funnel with wire mesh suitable for each pit as per site requirement complete all as specified and directed.

S&F in replacement of RCC cover of earth pit of size as per electrical plate No. 3 of SSR-2009, Part-I complete with suitable handle complete all as specified and directed by the Engineer-in-Charge.

M&L for common salt commercial , for recharging of earthing pits by filling in earthing pits complete all as specified and directed by Engr-in-Charge. (Note:- Recharging materials shall be soluble in water and to be filled/poured in earth pit after mixing in water in appropriate quantity.)

M&L for Charcoal dust/Breeze ,etc for recharging of earthing pits by filling in earthing pits complete all as specified and directed by Engr-in-Charge.

S&F in replacement of GI tubing 20mm bore medium grade for watering from bottom of earth pit to top of electrode in trenches/floor/fixed along pole/wall for watering of earthing with proper size of MS clamp, nut, bolts and washers complete all as specified and directed.

S&F in replacement of GI tubing 40mm bore light grade in trenches/floor/fixed along pole for cable/earth strip protection with proper size of MS clamp, nut, bolts and washers complete all as specified and directed.

Testing of all type of existing earthings in the station by carrying out the following:- (a) Seperating the earthing strip from the test point by opening the nut bolts or by cutting the earth strip as required and carrying out earth testing by a calibrated digital earth tester of renowned make ( ISI marked) in presence of JE E/M /Engr-in- charge & rep of user. (b) A earth testing register shall be opened and values to be noted down with signature of rep of user. (c) In case desired values is not achieved ,measure such as watering the earth pit to be done before carrying out retest of same earthing pit. In the event of not achieving the desired value ,earthing pit will be repaired by digging the earth pit to required level and adding salt & coal or replacement with new earthing as directed . Note:- (1) Watering of earthing pit to be attain desired value is using water bowser or by any means included the quoated raated (2) In case desired value is not achieved and earthing is required to be repaired or redone new earthing ,same shall be done as per direction of GE/ Engr-in-charge for which rate will be paid separately under relevant items of schedule. (3) Calibrated &ISI marked Earth tester shall be arranged by contractor &included in quoated rate. (4) Earth testing register to be filled with date & signature of rep of user .Unsigned values noted in the register will not be accepted. (5) Broken Earthing pits /funnels /pipe to be replaced for which rates shall be quoated separately BOQ. (6) An experience & qualified manpower shall only be engaged to carrying out the earth testing. (7) Refixing of earthing strip to the test point /brazing /fixing nut bolt to make good the testing strip will be carrying out & to be included in the quoated rate. (8) If retesting of earthing is required after repairs ,same shall be paid extra.

Taking down Old material retrieved from copper/chemical/ GI earthing any type and size.

Supply & fix 15 mm Taps of cast iron or malleable cast iron galvanised,screwed for GI pipe and fixed with 15mm dia bore pipe for filling water to earth pit.complete all as specified and directed by Engr-in-charge.

Supply & fix 15mm dia stop valves cast copper alloy screwed down high pressures, with crutch or butterfly handle screwed both ends for iron pipe or for unions and fixed complete all as specified and directed by Engr-in-charge.

M&L for pouring of Earth Recharger water soluble soil reactivation earthing compound in GEL form per 6 kg bucket comprising of ion and catalyzer for reduction of earth resistance as retaining moisture in the earth pit complete by excavating Earthing pits for pouring of Earth recharger compound gel in Earthing pit by digging 1 feet deep around the earth pit, mixing the earth recharger with 10 litre of water separately and pouring the solution into digged hole slowly slowly within a period of 02 hours,leaving the solution with earth pit for 04 hours and then checking the resistance all as specified and directed by engineer in charge.Make-DSS or equivalent

Note :- An amount of Rs. 40,250.00 on account of credit schdule for Sch 'A' Part-II Shall be deducted from the total amount of BOQ to arrive at the contract sum.

FG CONSTRUCTION (BID ID -3445690)

M/S BALI AGENCIES (BID ID -3440059)

M/S BASHIR AHMAD AND SONS (BID ID -3443311)

M/S ABBAS M. ENTERPRISES (BID ID -3440414)

M/s Gh Qadir and Sons (BID ID -3439852)

M/S MARSHAL TRADERS (BID ID -3445893)

BHAT CONTRACTORS AND GENERAL ORDER SUPPLIERS (BID ID -3445649)