PROVISION AND IMPROVEMENT OF EARTHING INFRASTRUCTURE AT AF STN THOISE UNDER GE AF THOISE

Amount

M&L for Maintenance free chemical earthing system complete with 01 (One) Nos. UL 467 approved copper bonded earth rods 17mm dia. 3000mm long electrode buried in ground to bore holes 100mm dia vertically to a depth not less than 3.00 Mtr deep below ground level with top edge earth electrode at a depth not less than 300 mm below normal ground level, provision of copper bus bar of size 100mmX25mmX5mm for inter connection with copper earth lead strip 50mmX6mm and further connected to test point terminal block of size 200mmX50mmX6mm made of copper as directed, including 45 Kg (Minimum) NABL Lab Certified back fill chemical compound for filling bore holes with soil mixed, so as to achieve earth resistance below 2 Ohms including excavation and earth work and earth neutral voltage less than 03 Volts of PCC chamber in PCC (1:3:6) typeC-1 (using 20mm graded stone aggregate) with Pit cover of 300mmX300mm made of Cast Iron complete all as specified and as directed by Engr-in-Charge.

M&L for Earthing complete with copper plate electrode 600x600x3.15mm thick electrode burried directly in ground not less than 3.0 mtr deep below normal ground level with top edge of earth plate not less than 2.5 mtr below normal ground level connected to and including and 20x3 mm copper strip as earth lead by means of bolt ,nuts, check nuts, and washers of stainless steel and duly welded incl PCC pit in PCC 1:2:4 type B-I angle iron 40x40x3mm frame, pit in PCC 1:2:4 type B-I cover 40mm reinforced with XPM weight not less than 4 Kg/Sqm and 6mm dia bar handle, excavation and earth work in any type of soil, charcoal dust and salt light grade GI watering pipe 20mm bore with funnel and wire mashand medium grade GI protection pipe 40mm bore and earth wire up all as shown in electrical plate No 3 of MES SSR- Part-I all as directed and specified by Engineer-in-charge. Note : (i) Excavation work should be done by manpower only. (ii) Earth test should be done by contractor at his own cost and if required result is not found at site, entire earthing should by contractor again without accruing any extra cost to the department. No claim whatsover on redoing the earthing shall be admissible by the department to the contractor.

S&F Air termination, single pointed, copper rod 12mm dia and 300mm long complete all as specified and as directed by Engr-in-Charge.

S&F Test point terminal block made of gun metal or phosphorus bronze size 75x75x25mm drilled and screwed including 3 nos. 8mm dia 25mm long hex. head screw complete all as specified and as directed by Engr-in-Charge.

S&F Lightning Strike Counter To protect the systems against the transient overvoltage (lightning) Digital Type With Li Battery Backup complete all as specified and as directed by Engr-in-Charge..

S&F Earthing Display board made up of FRP material having size of 200 mm x 150 mm x 3 mm with following details. It should free standing with suitable mounting stand complete all as specified and as directed by Engr-in-Charge. (1) Name of Manufacturer/ Trade Name / Supplier (2) PO NO: (3) Feeder Name (4) EarthPit No (5) DrawingNo (6) Length Of Electrode in mm (7) Date of Installation (8) Resistance value in Ohm on Installation date (9) Soil Resistivity in Ohm-Meter

S&F PVC covered Soft Drawn Copper Conductor of size 150 Sqmm with composition 37/2.25 ( No of Strand/Wire Dia mm) complete all as specified and as directed by Engr-in-Charge.

S&F PVC Covered High Conductivity copper Tapes/Strip of size 25x3 mm complete all as specified and as directed by Engr-in-Charge. Note :- Joint of Strip will be done by Exothermic Welding or as per direction by Engr-in-Charge.

S&F Back Plate Holdfast Stem of High grade copper Alloy Required for installation of tape/Strip is to be secured away from the face of wall/ceiling with appropriate D.C Clip complete all as specified and as directed by Engr-in-Charge.

S&F Bi-metallic Connector Tape/Strip To Conductor of size 25x3 with 150 Sqmm of High grade copper alloy connectors are used in bi-metallic earthing systems to use inhibiting compound with this assembly complete all as specified and as directed by Engr-in-Charge.

S&F Square Tape /Strip Clamp of High Grade Copper Alloy Suitable for 4 way connections, straight through or tee joints for tapesof size 25x3 mm complete all as specified and as directed by Engr-in-Charge.

S&F D.C Tape/Strip Clip with base of high grade copper alloy Used for Supporting & Secure Flat tape to the structure of size 25x3 mm complete all as specified and as directed by Engr-in-Charge.

S&F Air Terminal Base of High Grade Copper Alloy Ridge Saddle used for supporting lightning conductor air terminals on the roof ridges. For supporting air rods onto flat roof surfaces and to accommodate conductor tape/Strip for lightning protection system of 12 mm dia rod & 25 x3 mm tape size complete all as specified and as directed by Engr-in-Charge.

M&L for Earth Enhancing Back Fill chemical Compound (Bentonite) to additional filling in the chemical Earthing complete all as specified and as directed by Engr-in-Charge.

M&L for Earth Bars 6 way With Twin Disconnecting Link Made out of 50 x 6 mm pure copper bar pre-fitted on epoxy powder coated metal or plastic base mounted on insulators complete all as specified and as directed by Engr-in-Charge.

M/S BALI CONSTRUCTIONS

M/S NINDI BUILDERS

RAVI KUMAR

Ashoka Engineers