COMPREHENSIVE MAINT OF EARTHING INCLUDING QUATERLY HALF YEARLY YEARLY CHECKS OF EARTHING ALONGWITH REPAIR REPLACEMENT OF EARTHING SYSTEM AND CONNECTED ACCESSORIES WORKS AT VARIOUS BLDGS HANGARS LABS AT ZONE I AT RCI UNDER GE I RND RCI HYDERABAD

Amount

Checking/testing of Earth resistance value of earthing pits Installed inside RCI TECHNICAL AREA as requirement basis as directed by Engr in Charge or as schedule and making the damaged earthing serviceable by pouring salted water into earthing or making continuity by CU strip/GI strips/GI wire and bringing down the resistance value within user SOP specified limits. including maintenance of existing earthing by cleaning the earth chamber funnel and cleaning of vegetation surrouding earthing pit up to 2 mtr. Note: (i) The entire station will be divided into two zones as per earthing location and the contrcator will deploy seperate team for each zone to test the resistance value of earthings in each zone to complete the process within one month. The entire process will be repeated after every 03 months, 06 months, 12 months as per the SOP of RCI(DRDO) (FORMAT AS PER CATEGORY WISE IS ENCLOSED IN PS) upto completion of the contract.

(ii) earthing resistance value measurement taken before or after rectification for one earthing is measured as one job. (iii) Digital Earth tester will be arrenge by the contractor his own. (iv) Earth Resisitance value measurement , Date of testing and due date of testing is to be written on a format (proper register to be made of format enclosed in PS Sl No. 19) enclosed in PS with sign of user rep , JE in charge & Engr-in Charge.. (iv) Testing and corrective action is to be done within one month from date of commencement .The contractor has to deploy electrician with helper and testing equipment and all the resources to complete the task within one month. (v) If any material required for improvement of resistence value which value is more than their permissible limit will be measured and paid seperately.

Taking out old and Refixing the same aluminium strip/copper strip/GI strip 25mmx3.15mm to 32 x6mm. fixed on roof, pillars, walls etc. with rexing/replacement of DMC/epoxy earth strip insulator/porcelain isolator having not less than 50mm height with screws and placed at an internal not less than 50cm in such a manner that strip should not touch the wall/roof/pillar surfaces etc. for roof conductors and down conductors above ground above roof/wall/pole complete all as specified and directed. Note:- (i) New epoxy insulator shall be measured and paid saperatly

Supply & fix in repairs epoxy earth strip insulator weather proof heat proof including base screw complete as per site requirment

Supply and fix in repair of aluminium strip 25mm x 3.15 mm complete with new porceline insulator by means of screws of suitable size for isolation of strip complete all as specified and directed.

Supply and fix in repair of copper strip 20mm x 3.15 mm complete with new porceline insulator by means of screws of suitable size for isolation of strip complete all as specified and directed.

Supply and fix in repair of single pointed aluminium rod 12 mm dia and 300 mm long fixed on the roof including all fittings, fixtures and PCC 1:2:4 type B-1 blocks 100mm x 100mm x 100mm complete all as specified and directed.

S&F with replacement of GI strip 32 x 6 mm buried in ground after testing point complete.

S&F with replacement of copper strip 32 x 6 mm buried in ground after testing point complete.

S & F test point termininal made gun metel phosporos bronze size 75 x 75 x 25 mm drilled and screwed including 3 Nos. 8mm dia long hex. Head screw and polycarbonate junction box corrosion free 130mmx130mmx100mm proof weather proof and 2 Nos busbar insulator , nut,bolt and washer of size not less than complete .

M&L for providing earthing complete with galvanised steel earth plate electrode 60 x 60cm x 6.0mm thick buried dirictly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to galvanised earth lead wire 4.0 sqmm size upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel all including providing alternate layer of charcoal and salt as shown in electrical plate No.3 of SSR Part-1 and connected to test point including necessary excavation/ earth work in any type of soil/rock strata, PCC 1:3:6 type C1 cement concrete 1:2:4 type B1 reinforced with welded steel wire fabric (AMP) not less than 4 KG per Sqm funnel with wire mesh and watering pipe 20 mm dia bore (GI medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 15 mm dia light grade for earthing lead complete all as specified and directed including demolition of old unservicable earthing.

M&L for providing earthing complete with galvanised steel earth plate electrode 60 x 60cm x 6mm thick buried directly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to galvanised earth lead 32x6mm GI strip upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel providing alternate layer of charcoal dust and salt providing alternate layer of charcoal and salt providing alternate layer of charcoal and salt providing alternate layer of charcoal and salt all as shown in electrical plate No.3 of SSR Part-1 and connected to test point including necessary excavation/ earth work in any type of soil/rock strata, PCC 1:3:6 type C1 cement concrete 1:2:4 type B1 reinforced with welded steel wire fabric (AMP) not less than 4 KG per Sqm funnel with wire mesh and watering pipe 20 mm dia bore (medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 40mm dia medium grade for earthing lead complete all as specified and directed including demolition of old unservicable earthing. Note : Earth strip and protection pipe up 7.5 Mtr is demmed to be included with unit rate of item

All as per item No 11 here in above but using galvanised iron strip 25 × 4mm as earthing lead

M&L for providing copper chemical earthing complete with copper earth plate electrode of 90 x 60cm x 3.15mm thick buried directly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to copper earth lead 20 x 3 mm (copper strip) upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel all as shown in electrical plate No.3 of SSR Part-1 and connected to and including phophor bronze or copper strip 50x6mm 70mm long 3way test in PVC Junction box point including necessary excavation/ earth work in any type of soil/rock strata, PCC 1:3:6 type C1 cement concrete 1:2:4 type B1 reinforced with welded steel wire fabric (AMP) not less than 4 KG per Sqm funnel with wire mesh , PCC pit with 50mm thick PCC cover etc.The chemical should be tested and certified by any international accredited laboratory. The earthhencing compound should be tested referring to protocol IS 1350/&/EC62321/111/54/CDV. The PH value of compound should be between 7 to 8. The content of mercury (Hg) & Hexacromium should be below detection level. The electrode should be tested for salt spray test as per BIS117-09 for corrosion for minimum 500Hrs. including testing on completing including HDPE protection pipe 63mm dia heavy grade for earthing lead protection complete all as specified and directed including demolition of old unservicable earthing.Earthing strip should br burried in ground properly,necessary earth work for strip shall be deam incl. in quoted rate.

M&L for providing earthing complete with copper earth plate electrode 60cm x 60cm x 3.15mm thick buried directly in ground (Earth pit not less than 2.25 meters deep below ground level) with top edge of the plate not less than 1.5 meters below normal ground level, connected to copper earth lead 20x3mm (copper strip) upto 7.5 meter long by means of bolts,nuts check nuts and washers of all galvanised iron or steel including layer of BFC (Backfilling compund chemical), earth conductivity enhancing compound around both side 15cm thick layer and 15 cm layer top and bottom ( Volume 90cmx 90cmx 30cm) all as shown in electrical plate No.3 of SSR Part-1 and connected to test point including necessary excavation/ earth work in any type of soil/rock strata, PCC 1:2:4 type B2 (20mm graded agreegate) cement concrete & 1:2:4 type B1 reinforced with welded steel wire fabric (AMP) not less than 4 KG per Sqm funnel with wire mesh and watering pipe 20 mm dia bore (GI medium grade), PCC pit with 50mm thick PCC cover etc. including testing on completing including GI protection pipe 25 mm dia(ID) medium grade for earthing lead complete all as specified and directed including demolition of old unservicable earthing. Note : Earth strip and protection pipe up 7.5 Mtr is demmed to be included with unit rate of item

Supply and instalation & testing of tripode (SET OF 3) of fast copper earth electrode maintenance free chemical earthing interconnected (distance between the earth 1.5Mtr from each other) with copper earth strip 32x6mm and making tripode each earthing having 3 mtr long copper pipe of diameter 76 mm. There should be terminal for connection of 20 x 3 mm of copper strip with two holes of 14 mm diameter. FAST ELECTRODE is duly fitted with the highly conductive material with sealing at both ends with lead terminals of 20x3 mm copper strip at top, BFC (Backfilling compund chemical), earth conductivity enhancing compound alongwith Minimum 4 bags of 25 Kgs each of earth enhancing compound, including drilling a bore in earth of dia minimum 300 mm dia. The chemical should be tested and certified by any international accredited laboratory. The earthhencing compound should be tested referring to protocol IS 1350/&/EC62321/111/54/CDV. The PH value of compound should be between 7 to 8. The content of mercury (Hg) & Hexacromium should be below detection level. The electrode should be tested for salt spray test as per BIS117-09 for corrosion for minimum 500Hrs. The FAST ELECTRODE shall be dully tested & Certified by CPRI (Central Power Reserch Institution), Govt of India for a suitable minimum short circuit current for 1 second with initial pick of suitable KA. The Fast ELECTRODE shall be approved by CPRI, ERDA/NABL Lab complete all as specified and directed. Note : 5 Mtr Earth strip size 20mmx 3mm is deemed to be included with unit rate of item. belyond 3 Mtr earth strip will be measured and paid sepearatly

Supply and instalation & testing of fast copper earth electrode maintenance free chemical earthing having 3 mtr long copper pipe of diameter 76 mm. There should be terminal for connection of 20 mm x 3 mm of copper strip with two holes of 14 mm diameter. FAST ELECTRODE is duly fitted with the highly conductive material with sealing at both ends with lead terminals of 20x3 mm copper strip at top, BFC (Backfilling compund chemical), earth conductivity enhancing compound alongwith Minimum 6 bags of 25 Kgs each of earth enhancing compound, including drilling a bore in earth of dia 300 mm dia. The chemical should be tested and certified by any international accredited laboratory. The earthhencing compound should be tested referring to protocol IS 1350/&/EC62321/111/54/CDV. The PH value of compound should be between 7 to 8. The content of mercury (Hg) & Hexacromium should be below detection level. The electrode should be tested for salt spray test as per BIS117-09 for corrosion for minimum 500Hrs. The FAST ELECTRODE shall be dully tested & Certified by CPRI (Central Power Reserch Institution), Govt of India for a suitable minimum short circuit current for 1 second with initial pick of suitable KA. The Fast ELECTRODE shall be approved by CPRI, ERDA/NABL Lab complete all as specified and directed. Note : 5 Mtr Earth strip size 20mmx 3mm is deemed to be included with unit rate of item. belyond 3 Mtr earth strip will be measured and paid sepearatly

Labour only for watering the existing earthing pits with salt and coal as desired level at site in each area all as specified and directed by Engr-in Charge. Note:- (a) Contractor shall quote the rates by including the charges of making arrangement of watering the earthing pits at any site and location inside Airforce area. (b) Salt should be paid separetely in respective item in schedule.

Supply only salt suitable for earthing pit complete all as specified and directed by Engineer-in-charge.

Dismantling and taking out of old damage earth pit and construction of new earth pit in in cement concreat PCC 1:2:4 TYPE B1(using 20mm graded crushed stone aggregate) as per SSR aprt I plate No 3 by using angle iron of size 40 x 40 x 3mm frame on top including earth work and cleaning the area/levelling & RCC cover of 1:2:4 type B-1 (using 20mm graded crushed stone aggregate) reinforced with 8mm dia TMT bars @ 75 C/C both ways and handle made of mild steel rod 12mm dia including provided new funnel with wire mesh complete all as specified and directed.

M &L for Prepration of new IDENTIFIER/MARKER madeout of preferably metalic of size 30cm x 20cmx 2 mm thick metalic board fixed on MS Angle 30 X 30 X 5 mm of 450 mm long to be fixed to ground by means of cement concrete including painting with two coats of synthetic enamel paint over a coat of red oxide primer and writing the earth resistance complete and coloured with following colour coading to identify. a) For Chemical Earth pits -RED colour b) For conventional/Maintenance free earth pits-YELLOW colour. Identification mark should be embosed on plate with following letters. c) LIGHTNING ARRESTER EARTH - LE (Trangular shape) d) SPECIAL EARTH - SE(Dome shape) e) LT PANEL EARTH/ UPS EARTH- PE(Square shape) f) Height of the Identifier should be 60cm above the ground level all as directed

Material and Lalour for providing BFC (Backfilling compund chemical) in 25 kg bag, earth conductivity enhancing compound to level Chemical the existing chemical earth pit including taking out mud from existing earth pit and cleaning complete all as specified and directed by Engineer-in-charge.

Excavation in trenches, n. exc 1.5 Mtr wide and n. exc 1.5 Mtr in depth for Foundation/laying of strip/ cable and getting out in soft/loose soil.

Removing of excavated soil to a distance n. Exc 50 Mtr and depositing where directed at a level n. Exc 1.5 Mtr above the starting point

Returning, filling in including spreading, levelling, watering and well ramming in layers n. Exc 25 cm thick.

Supply & fixing Down conductor made of Copper / GI for lower impedance. It should have a minimum cross sectional area of 50mm² or equivalent size of GI strip and comply with IEC 62 305 standard. The down conductor shall be routed as directly as possible to the ground avoiding electrical shafts and sharp bends (minimum bending radius of 0,5m). Any metallic object located less than 1 meter shall be connected to it.

Supply laying, testing & commissioning of JEF Nimbus Early Streamer emission Air terminal (ESEAT). ESEAT shall have a corrosion resistant stainless steel body (AISI 316 grade) capable of working in hazardous atmosphere. The Air terminal shall be non-radioactive and require no special licensing. The unit shall be fully autonomous (no battery, no external power supply required ), collect energy from ambient electric field. ESEAT model must be tested in a high voltage laboratory in accordance with NFC 17 102 for a series of 100 shock waves equal to 325µs in order to measure the average gain in triggering. The average gain in triggering time (ΔT) obtained during the lab test for the offered model must be mentioned in the test report. ESEAT must work on negative as well as positively polarized discharges. ESEAT must have been tested for such discharges by a reputed Indian Laboratory like Central Power Research Institute (CPRI). A dedicated tester should be avilable to test the healthiness of the ESEAT on request ( Courtesy : Page No. 37, Point No. 3 of Clause 8.6 of the Revised NFC 17-102 version 2011 ). ESEAT Model : NLP 2200 - Radius of protection = 30 Mtrs Level of protection considered for the project = Level I.

Supply of Standard / Side mounting / Special Mounting Structure of GI + Aluminium of height 4.5 Mtrs with base plate suitable for roof mounting on concrete base and with FRP adapter without GUY kit.

S&F test link box in order to disconnect the earth termination system for enabling measurements.

Supply & fix 4 Digit electromechanical Lightning Event Counter in WEATHER PROOF ENCLOSURE. The counter should give the number of strikes intercepted by the lightning arrester.

Material and labour for brazing of earthing copper strips at various locations of size 20mm to 50mm width of thickness 3mm to 6mm by using oxygen and acelylene gas cylinder with copper rod material including removing of existing nut, bolt and insulator and refixng after brazing complete all as specified and directed Note :- 1. Any damage of building portion during working time will be repaired and made good deemed included in quoated rate of item. 2. Contractor shall be responsible to replace old warnout nut bolt and insulators with new material. cost of matrial also deemed included in quoated.

Material and labour for welding / brazing of earthing Al / GI strips at various locations of size 25mm to 50mm width of thickness 3mm / 5mm / 6 mm by using welding rod material including removing of existing nut, bolt and insulator and refixng after brazing complete all as specified and directed. Note :- 1. Any damage of building portion during working time will be repaired and made good deemed included in quoated rate of item. 2. Contractor shall be responsible to replace old warnout nut bolt and insulators with new material. cost of matrial also deemed included in quoated.

SUN LIGHT HOUSE (BID ID -3321657)

M.R.ENTERPRISES (BID ID -3322608)

WELDECOR (BID ID -3320525)

CHITRA ENGINEERING CORPORATION (BID ID -3321508)

S.S.ENGINEERING CORPORATION (BID ID -3321480)

SRI SAI ENTERPRISES (BID ID -3320660)

Maruthi international (BID ID -3322662)