REPAIR/ MAINT OF EARTHING INFRASTRUCTURE AND OTHER CONNECTED ITEMS OF TECH INFRA 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 2.25mtr deep below ground level) with top edge of the plate not less than 1.5mr below normal ground level connected to 20x3 mm Copper 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 40mm 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 complete with earth pit pit covers of 300mmx 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 specifed and directed. Note: (i) Copper strip 7.5 mtr included in the quoted rate from earth pit to test point (ii) Contractor should ensure that result of each earthing is less than 2 Ohm and in case soil is not suitable for the same is to be placed suitable clay soil to bring the desired result. Contractor shall qute rates after site visit accordingly. (iii) On testing after completion if the desired resistance is not obtained the contractor shall redo the earthing without any extra cost to department. (iv) Work includes brazing work for earth strip. (v) Work includes brazing of Cu strip to copper earth electrode

M&L for Earthing complete with GI earth plate 600 x 600 x 6 mm thick buried directly in ground (earth pit not less that 2.25mtr deep below ground level ) with top edge of the plate not less than 1.5 m below normal ground level connected to 32X6mm GI 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 complete with earth pit 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 and as directed. Note: GI strip 7.5 mtr included in the quoted rate from earth pit to test point

M&L for Earthing complete with GI earth plate 600 x 600 x 6 mm thick buried directly in ground (earth pit not less that 2.25mtr deep below ground level ) with top edge of the plate not less than 1.5 m below normal ground level connected to 25X4 mm GI 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 40mm 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 complete with earth pit 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 specifed and directed. Note: GI strip 7.5 mtr included in the quoted rate from earth pit to test point

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 specifed and directed.

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 specifed and directed.

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 specifed 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 specifed and directed.

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 specifed and directed.

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, complete all as specifed and directed.

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 specifed and directed.

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 specifed and directed.

M&L for brazing in repair work for aluminum strip not exceeding 3.2 cm in length and not exceeding 6 mm in thickness, complete all as specifed and directed.

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 shape 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 all as specifed and directed.

Taking down Old material retrieved from copper/chemical/ GI earthing any type and size, complete all as specifed 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 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 specifed and directed.

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 bar 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 all as specifed and directed. Note:(i) Copper strip 7.5 mtr and their joints included in the quoted rate from earth pit to test point. (ii) Contractor should ensure that result of each earthing is less than 1 Ohm and in case soil is not suitable for the same is to be placed suitable clay soil to bring the desired result. Contractor shall qute rates after site visit accordingly. (iii) On testing after completion if the desired resistance is not obtained the contractor shall redo the earthing without any extra cost to department. (iv) Work includes brazing work for earth strip. (V) Work includes brazing of Cu strip to copper earth electrode Make for backfill, conductive concrete- marconite

Note :- An amount of Rs. 1,74,450.00 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.

M/S BASHIR AHMAD AND SONS (BID ID -3120580)

MS Ghulam Hassan and Sons (BID ID -3132217)

M/s Gh Qadir and Sons (BID ID -3134334)

M/S ABBAS M. ENTERPRISES (BID ID -3125356)

BHAT CONTRACTORS AND GENERAL ORDER SUPPLIERS (BID ID -3133779)