Testing of existing earthing and providing lightening protection system, maintenance free chemical-earthing and aviation light for 4G Towers under SM(E)Z4, MTNL, Mumbai

TESTING OF EXISTING OLD EARTHING FOR TELECOM TOWERS: Testing of existing earthing with digital earth-meggar kit and submitting the report to the engineer-in-charge. Value of earth-resitance as tested individually for each earthing as well as the combined value after interconnecting earthing through GI earth strip must be less than 1 ohm. Watering the existing earthing (i/c addition of salt, if required) also to be done by the firm for achieving desired earth results wherever existing earthing found dry. (Note: One job implies one earth-pit, irrespective of the number of earth-pits at one site. However, the item shall be measured and paid only in case existing earthing results are satisfactory and existing old earthing need not to be replaced with new earthing)

SITC OF MAINTENANCE-FREE CHEMICAL EARTHING FOR TELECOM TOWERS: Earthing with COPPER BONDED STEEL EARTH PIPE ELECTRODE 3.0 MTR LONG, 17.2mm diameter having uniform copper bonding of minimum 250micron thickness all around the steel electrode (UL approved & CPRI tested) and having pointed tip bottom and copper coated clamp- at top- having 4 holes for connecting eart-strip & M10 x 35mm SS nut-bolt and spring washers including accessories and providing Heavy-duty of 2000 Kgs load bearing capacity polyplastic/HDPE weatherproof enclosure of suitable size (not less than 250mm deep x 300mm wide) with cover plate having locking arrangement including digging the earth pit of suitable dia. and depth in ground (soft/hard bed) and refilling the same with maintenance-free environmental friendly semi-soluble, non-corrosive, conductivity improving mineral back-fill compound (25kg-30kg) etc. complete as required including testing the earthing results with digital earth-meggar. (Earthing Make: RDSO approved) (Note: Value of earth-resitance as tested individually for each earthing as well as the combined value after interconnecting both earthing through 25mmx5mm GI earth strip must be less than 1 ohm)

Supplying, laying & fixing 25mm x 5mm GI strip on surface/in recess/ underground at 0.50mtr below ground as strip earth electrode, including connection/terminating with GI nut-bolt spring-washer including excavation and refilling etc. complete as required. (Jointing shall be done by overlapping and with 2 sets of GI nut-bolt and spring washer spaced at 50mm, GI strip to be clamped using GI clamps at distance between two clamps not more than 0.5mtr in case of surface GI strip). Note: Pvdg & fixing of PVC insulation sleeve on GI strip wherever required to be carried-out as per site-requirement without any extra charges.

Providing and fixing testing joint made of 25mm x 5mm thick GI strip, 125mm long, with 4 numbers of GI nuts-bolts, check-nuts and spring washers etc. complete as required.

Providing and fixing testing joint FRP Box Size 200 mm X200mm ,including 20x3 mm thick x125 mm long G.I. strip, with 4 nos insulators,. G.I nut . bolts, chuck nuts and spring washers etc. complete as required.

SITC OF LIGHTENING ARRESTOR FOR TELECOM TOWERS: Providing and fixing of lightning-arrestor made of 25mm dia. hollow tubular copper finial 1500mm long having minimum 1.6mm wall thickness and five number copper spikes at top, 140mmx140mmx6mm thick G.I. base plate including holes, nut-bolts and other fixing arrangements etc. complete as required as per approved drawing. The lightening arrestor shall have lower 130mm portion of the finial threading and duly tinned. The Lightening Arrestor shall be fixed to the tower with a Teflon sheet/ Earthing insulator to avoid direct contact with the tower.

SITC OF LOW INTENSITY LED TYPE TWIN AVIATION OBSTRUCTION LIGHT ON TELECOM TOWERS: SITC of Low Intensity LED type TWIN Aviation Obstruction Light with photosensor, having die-cast aluminium housing, Red Polycarbonate dome (or Red coloured LED with white polycarbonate dome) for better illumination, integral driver, IP 65 protection and suitable for operation on 240V, 50Hz single phase AC supply (with wide operating voltage range 100V to 270V AC), inbuilt protection against short-circuit and surge, complete with mounting fixture as per specifications including making connecton etc complete as reqd. . The aviation light fixing/mouting arrangement shall be made out of 300mm long 25.4mm dia tube complete with threading and nut-bolts etc. as per approved drawings.

Supplying, Laying, fixing, testing and commissioning of following size XLPE Copper Conductor armoured cable of 1.1 KV grade including cable end-terminations at both ends with brass compression gland and copper lugs etc. complete as required as per specifications. a) 3x1.5 Sq mm

Supplying and fixing following way, single pole and neutral, sheet steel, MCB distribution board, 240 V, on surface/ recess, complete with tinned copper bus bar, neutral bus bar, earth bar, din bar, interconnections, powder painted including earthing etc. as required. (But without MCB/RCCB/Isolator) a) 6 way double door

S/F of 6A to 32A rating 240/415V ,10 KA,"C" curve MCB suitable for inductive load of following poles in the existing MCB DB complete with connections testing and commissioning etc. as reqd a) 6 to 32 amp DP

S/F of 6A to 32A rating 240/415V ,10 KA,"C" curve MCB suitable for inductive load of following poles in the existing MCB DB complete with connections testing and commissioning etc. as reqd b) 6 to 32 amp SP