SPECIAL REPAIRS OF LIGHTENING PROTECTION AT VARIOUS EXPLOSIVE MAGAZINES AT NAD TROMBAY UNDER GE (NW) MANKHURD.

Supply and fixing, in repair, of Aluminium Air Termination Rod, 12 mm dia and 300 mm long, for Lightning Protection System as per IEC 62561-1&2, including removal of existing rod, providing suitable base plate, nut bolts, washers, clamps and all fixing accessories, drilling, anchoring, proper alignment, bonding with down conductor, insulator and complete installation, complete in all respects as specified and as directed.

Supply and fixing, in repair, Aluminium strip 25 × 3.15 mm, laid in grid formation, including providing porcelain insulators for supporting the strip and fixing with suitable brass/gun metal nuts, bolts and washers, ensuring that the strip does not come in contact with the roof surface,includes removal of the existing strip, fixing, tightening and complete installation to meet the requirements of IS/IEC 62305 and IEC 62561-1&2. complete in all respects as specified and as directed.

Material and labour for providing and fixing, in repair, Earth Continuity Conductor/Main Earthing Lead of 32 mm × 6 mm GI strip, buried in ground, fixed on wall/batten/recess, drawn through conduit/pipe or fixed to poles as required, including removal of old strip, excavation (where necessary), laying, proper alignment, and connection by exothermic brazing and/or GI nuts and bolts, complete in all respects as specified and as directed.

Supply and fixing, in repair, Test Point Terminal Block made of gun metal/phosphor bronze, size 75 × 75 × 25 mm, drilled and tapped, including 3 Nos. 8 mm dia × 25 mm long hex head screws, complete with fastening/bolting of roof down conductor and earth electrode using suitable copper nuts and bolts, providing fibre sheet below the test point to avoid direct contact with wall surface, and enclosing the assembly in MS sheet box fabricated from 1.6 mm thick MS sheet, front openable, duly painted red with locking arrangement, including removal of existing test point, complete in all respects as specified and as directed.

Supply and fixing, in repair, 40 mm bore GI pipe (light grade) as protection pipe for Lightning Arrestor down conductor/Earth Continuity Conductor, laid in trenches, floors or walls, including all necessary fittings such as bends, sockets, couplings and clamps, complete with cutting, threading, jointing and fixing, as required and as directed by the Engineer-in-Charge.Make: Tata Steel / Jindal Steel / BST / Oswal.

Supply,Installation,Testing & Commisioning of Aluminum Square Tape Clamp for Cross connection and T connection of 25x3.15mm Aluminium Tape should be tested for electrical resistivity test ,Environmental Test (salt spray & humidity test),Mechanical test and Impulse current withstand capability of 100KA (Class H)to meet the requirements of IS/IEC 62305 and IEC 62561-1&2.

Material and labour for providing cement concrete 1:2:4 type B-1 (using 20 mm graded crushed stone aggregate) for coping of poles, making base for fixing of earth strip, Air termination rod on roof top, blast pan or indicated site , and other indicated work including necessary form work and finished the surface and including dismantling of old unserrviceable PCC complete all as specified and directed by Engr in charge.

Supply and fixing, in replacement, Earth Resistance Marking Plate made of MS plate 3 mm thick, size 200 × 200 mm, welded to MS equal angle 20 × 20 × 3 mm, 0.75 m long, with 0.30 m embedded in PCC 1:2:4 (Type B-1) foundation block of 200 × 200 × 300 mm below ground level, including necessary earthwork, painted and marked with Earthing No. and details of earth, with suitable colour coding for conventional/chemical earthing. The rate includes earth resistance testing using approved earth tester and stenciling indicating Earth No., Test Date and Resistance Value, complete as specified and as directed.