SPECIAL REPAIR/REPLACEMENT OF EXISTING EARTHING INFRASTRUCTURE AT VARIOUS LOCATIONS AT AFS YELAHANKA

Amount

Taking down old unserviceable earth pit materials complete all as specified and as directed by Engr-in-Charge.

Taking down old unserviceable GI/Aluminium earthing strip of any size complete all as specified and as directed by Engr-in-Charge.

Material and labour for earthing complete comprising of 17.2 mm dia 3 mtr long UL Listed Earth electrode of low carbon steel electrode with 250 micron copper bonding to conform with requirements of UL467 & IEC 62561-2 (Dia of the rod & UL Control Number alloted to the manufacturer should be embossed on the rod & UL certificate from the same manufacturer shall be submitted along with the material), 50 pounds of Ecosafe Based environment friendly backfill and suitable clamp, Back-fill earthing enhancing compound should strictly be a Eco Safe Carbon based conductive concrete type which has a resistivity of less than 0.12 Ohm Mtr as per Clause 14.5D of IEEE : 80 standard. Back-fill compound should be electronically conductive ( Like in metals ) and should not depend on moisture for conduction. Back-fill comound should be environment friendly, should solidify when mixed with water and set like concrete and should not leach / diffuse into the ground. Back-fill compund shall not be mixed with any soil while pouring in the bore hole. Test Certificate as per as per IEC : 62561-7 for Back-fill compound shall be submitted along with the material. 17.2 OD SS clamp both side, Eco Friendly rust proof heavy duty weather proof Polyethylene Earth Pit Chamber with following dimensions :254 mm dia (top), 330 mm dia (bottom) & 260 mm (height).Exothermic welding set and provision of one copper bus bar near tapping point for connection complete all as specified and directed by Engr-in-Charge. Make:JEF or its techno commercial equivalent.

Eco Safe Carbon based backfill compound shall be suitable to be installed in either slurry or dry form and shall not be mixed with any soil / cement etc while pouring in the bore hole. enhancing backfill material only so that it improves conductivity of the earth electrode and ground contact area. The back-fill material shall have following characteristics… (i) Resistivity below 0.12 Ohm-meters as per Clause 14.5d of IEEE80-2000 Standard. (ii) Tested as per IEC : 62561-7 and the test certificates ( Corrosion Test,Leach Test, Sulphur Test & Resistivity Test ) shall be submitted. (iii) Shall not depend on the continuous presence of water / moisture / salt to maintain its conductivity. (iv) Shall not decompose or leach out with time. (v) Shall solidify when mixed with water and set like concrete. (vi) Shall contain a corrosion inhibitor to mitigate corrosion of copper (vii) Shall not contain hazardous chemicals and necessary Test certificate from reputed accredited laboratories shall be furnished. (viii) Shall not be affected by drought and shall be stable between -10˚ to +50˚C temperature. (ix) Shall be suitable for any kind of soil (x) Shall be supplied in sealed, moisture proof bags. These bags shall be marked with Manufacturer’s name or trade name, quantity, batch no & date of manufacture.

BENTONITE based compound shouldn’t be used as a back-fill material as they are largely dependent on moisture for their performance and needs water to obtain & maintain its beneficial characteristics and hence it may not function well in dry environment.

Test Certifiactes : The following test certificates shall be submiited by the bidder / vendor to the client’s engineer prior to supply of Eco Safe Carbon based Earthing : (i) UL certificate for the copper bonded electrode along with the UL control number (ii) Short circuit withstanding capacity of the copper bonded rod from an independent laboratory ( NABL Accredited Laboratory ) (iii) Corrosion test certificate as per IEC : 62561-7 for the backfill compoundfrom an independent laboratory (NABL Accredited Laboratory ) (iv) Leach test certificate as per IEC : 62561-7 for the backfill compound from an independent laboratory (NABL Accredited Laboratory) (v) Sulphur test certificate as per IEC : 62561-7 for the backfill compound from an independent laboratory (NABL Accredited Laboratory ) (vi) Resistivity test certificate as per IEC : 62561-7 for the backfill compound from an independent laboratory (NABL Accredited Laboratory) Note : The earthing value should be constant upto 15 years from the date of installation.

Supply and installation of 10 mm copper bonded Round steel solid Conductor for ring earthing meet the requirements of IS/ IEC 62305 and IEC 62561-2. Type B Earthing has been proposed for complete Buildings. Make:JEF of Type JIDC05 or its techno commercial equivalent.

Supply and fix Cable with copper conductor size 16 Sqmm PVC round sheathed (flexible) industrial cable single core green colour as earth continuity conductor suitable to connect with item No 4 above with suitable copper lugs and accessories complete all specified and as directed by Engr-in-Charge.

Note : (a) The earthing value should be constant upto 15 years from the date of installation. Certificate for the same to be obtained by the contractor from OEM and submitted to Engr-in-Charge before completion of work. (b) In case the value are not found within limit, the same to be rectified by the contractor at free of cost.

B5BUILDING SOLUTIONS

M/S SRI BALAJI ENTERPRISES

G K CONSTRUCTIONS

Vinayaka Enterprises