Military Engineer Services Tender

Supply and fixing 4 digital electromechanical lightning event counter in weather proof resistance complete all as directed . Make:- NIMBUS / JEF Techno / Erico or as approved by GE

Supply and fixing of test link for connecting the earth pit and down conductor complete all as specified and directed. Make:- NIMBUS / JEF Techno / Erico or as approved by GE

M & L for casting Chemical earth pits with Pipe in Pipe technology 50 mm Cu bonded , 200 microns, 3 Mtr Long Earth Electrode targeted/ achieving individual earthpit result from 1.5 ohms upto maximum of 5.0 ohms for each individual pit and by maintaining of expected Grid value of 0.20 ohms but less than 0.5 ohm for grid earth pits as in around individual technical building with the following items, specifications and testing complete for each pit and as directed by Engineer-in-charge. i) Boring 300 mm dia of earth pit in soft and loose soil upto the depth of not less than 2.5 m deep below ground level by means of any method i.e boring/ digging including removal of excavated material to a distance of 50 m as directed by Engr-in-charge in each pit.

ii) Filling the each bore hole with 10 kg thick compacted layer of earth enhancing compound to reduce the soil resistivity as per Clause 14.5d of IEEE 80:2000 (latest Edition) of make Terec+ as per manufacturers specifications iii) Placing of 3 m length of 50mm dia of copper bonded pipe-in-pipe earth electrode with welded copper plate 38mmx200mm of 12mm thick on top. The earth rod should be placed at centre of each bore hole/earth pit with minimum of 10 kg inserted in to Terec+ layer iv) Back filling with earth enhancing compound up to earth pit GL to reduce the soil resistivity as per clause 14.5b of IEEE 80:2000 (latest Edition) of make Earthcon upto the ground.

v) Connecting/Jointing/brace welding each electrode of earth pit serially with copper earthing strip 25X3 mm with minimum 3 m distance between two earth pits buried below GL in trench filled with earth enhancing compound to reduce the soil resistivity as per Clause 14.5b of IEEE 80:2000 (latest edition) by enhancing its ionic properties, dispersion properties, hygroscopic properties, expansion properties, diffusion properties etc, incl earth excavation complete all as directed by Eng-in-charge. vi) Placing 500X500X250 mm HDPE earth pit cover (IEC 62561-5) flushed with ground placed over 100mm thick PCC (1:3:6 Type I) of size 550 x 550 mm including required earth excavation, refilling and packing. The earth pit cover should be UV stabilized, lockable jam free lid, stackable design, resistant to substances including petrol oil, diesel, bitumen and concrete etc.

vii) The quoted rate is deemed to be inclusive of necessary removal of excavated soil to a distance of 50 mtr as directed by the Engr-in-Charge. viii) Any other requirement if desired by the Engr-in-Charge as per site conditions shall be provided by the contractor without any extra cost. Note: a) The earth pits should have a minimum distance of 3m from each other and a minimum distance of 2m from building walls b) If grid value is found less than 0.5 ohms then the contractor will re-execute earth pits or put addl pit with no extra cost to the Govt.

Supply and fix GI pipe heavy grade 40mm dia for support to air termination rod including fixing with clamp, nuts, bolts all as specified and directed.