Technical Specification of Roof Top Tower of 12, 15, 18 & 21m height

Technical Specification 

of 

Roof Top Tower of 12, 15, 18 & 21m height 

(Including Foundation, Earthing System & Aviation Warning Lamp) 

Specification No.: UTL/RTT/02-01 OCT 2011 

United Telecom Limited 

(JV of MTNL, TCIL, TCL & NVPL) 

Triveni Complex, Putali Sadak, Kathmandu, Nepal 

Price: NRs. 1130 

(Including VAT) 

UTL/RTT/02-01 OCT 2011 Page 1 of 31

Technical Specification 

of 

Roof Top Tower of 12, 15, 18 & 21m height 

(Including Foundation, Earthing System & Aviation Warning Lamp) 

Specification No.: UTL/RTT/02-01 OCT 2011 

United Telecom Limited 

(JV of MTNL, TCIL, TCL & NVPL) 

Triveni Complex, Putali Sadak, Kathmandu, Nepal 


Table of Contents 

Chapter Title Page 

1. General Specifications 4 

2. Bill of Materials of Towers & Foundation 10 

3. Earthing System & Lightening Arrestor 27 

4. Aviation Warning Lamp 30 

5. Key Diagrams 31 


1.0 Introduction 

Chapter-1 

General Specifications 

This document contains the generic requirements of self supporting type 21, 18, 15 & 12 

m Roof Top Towers for Cellular wireless systems. The towers shall be of angular 

construction in segments of 3m with a square base. The towers shall be four legged and 

able to support the loading of the antennas as given below: 

a. 2 Nos. of 1.2m diameter Solid antenna at 2.0m from the top of tower. 

b. 4 Nos. of 0.6m diameter Solid Antenna at 2.0m from the top of tower. 

c. 6 Nos. of panel antennas for cellular wireless systems (2600X262X115) weighing 

50Kg, 1m from the top of tower. 

1.1 Other parameter for designing of towers shall be as under 

a. Factor of Safety = 1.5 

b. Basic Wind Speed = 180 Km/hr 

c. Terrain Category = 2 

d. Building Height = 10m 

e. Tower twist and sway is found to be less than 0.5 deg @ 75% of basic wind speed. 

2.0 Detailed Technical Requirements 

2.1 Type of Tower 

4 legged self supporting type with square base & Angular construction in segments of 

3m. The details are indicated in drawing of tower. 

2.2 Foundation 

Beams shall be cast after connecting re-enforcement of the beams to the existing columns 

of the structure. Foundation bolts shall be placed in the beams using templates 

corresponding to the tower height. The columns and beams shall be RCC (M20). The 

existing columns shall be surveyed for the requisite capacity to carry the tower loads and 

the weight of the beams. Non-galvanized steel structures such as Anchor bolt etc. should 

be painted with red oxide coating. The base plates shall be galvanized as some of their 

portion may be directly exposed to environment. 

The foundation design/drawings of towers, given in the specifications UTL/RTT/02-01 

OCT 2011 and UTL/RTT/01-02 OCT 2011 may be considered for reference and actual 

foundation design/drawing shall be as per the actual site requirements. 


Material: M-20 grade concrete shall be used. High yield strength deformed steel bars of 

grade FE-415 conforming to IS: 1786 (1985) shall be used. Bending of bars shall be as 

per IS: 2502 (1963). 

2.3 Super Structure 

2.3.1 Legs/ Bracings 

Material: MS angles of grade ‘A’ as per IS 2062, IS: 808 (1989) shall be used. 

Finish: All MS angles are to be hot dip galvanized as per IS: 4759 (1996). Zinc for 

galvanizing should conform to IS: 13229- 1991 or IS: 209 (1992). 

2.3.2 Gusset/ Splice Plates 

Material: MS Plates of grade ‘A’ as per IS 2062 shall be used. 

Finish: All the plates are to be hot dip galvanized as per IS: 4759 (1996). Zinc for 

galvanizing should conform to IS: 13229- 1991 or IS: 209 (1992). 

2.3.3 Nuts, Bolts & Washers 

Material: Nuts and bolts of grade 5.6 as per IS: 6639 (1972), IS: 1364, IS: 1367 part 8 

(1992) and plain washers as per IS: 6610 (1972) & spring washers of type ‘B’ as per IS: 

3063 (1994) shall be used. 

Finish: Nuts, bolts and Washers are to be hot dip galvanized as per IS: 1367. 

2.4 Connection between Vertical Legs and Bracings 

Vertical legs and bracings shall be connected to each other at site by gusset/splice plates 

with nuts, bolts and washers by user as per design. The design of tower members and 

joints shall be in accordance with the relevant provisions in BIS document IS: 800 

(1984). 

3.0 Arrangement for feeder cable rack 

Rack for running feeder cable(s)/ waveguide(s) from the rear of the antennas up to the 

Base Transceiver Station (BTS) equipment shall be provided. Suitable support brackets 

and outside feeder cable runway (as per the drawings) shall be provided. Feeder cable 

runway shall be of 400mm width. The prefabricated rack sections shall be hot dip 

galvanized as per IS: 4759 (1996). 

4.0 Ladder 

A ladder shall be provided externally for the entire height of the tower. Hoops and 

runners shall be provided to ensure the safety of the persons climbing the tower. Ladder 


width/pitch shall be 400 mm and 300mm respectively. The diameter of safety hoops shall 

be 650mm and Guard radius should be 325mm. 

5.0 Platforms 

Working platforms shall be provided at 3m below from Top of Tower. The details are 

given in the drawings. 

6.0 Wind Velocity 

Tower shall be operational and able to withstand the wind velocity of 180 Km/hr. 

Suitable allowances shall be made for antennas, ladder, platforms wave guide/feeder 

cables and maintenance persons. 

7.0 Lightning Arrestor 

Lightning arrestor using lightning rod made of copper, with 16 mm diameter and 1200 

mm length as per IS: 613(2000)] with a spike on one end and threading on the other shall 

be provided on the top of the tower. Tin coated copper wire IS mark of gauge 50 sq. mm 

shall be provided from lower of the lightning rod to the lug with a hole provided at 0.5 m 

below the top of the tower. The supply of the material and installation shall be in the 

scope of the supplier. 

8.0 Aviation Warning Lights 

Fixing arrangement for twin type aviation warning lights at the top level shall be 

provided. Aviation Warning Lamps shall conform to ICAO regulation. 

Note: 

i. Screened PVC insulated twin copper wire of size 3/22 (IS Marked) will be used 

for connection of aviation warning lamp to the power supply. 

ii. The aviation warning lamps and Screened PVC insulated twin copper shall be 

supplied by tower supplier. The detail specification is attached at Chapter-4. 

9.0 Antenna mounting fixture 

Antennas- GI pipes, conforming to IS: 1161(1998) with minimum Yst220 Mpa with NB 

65 medium class, 3.0 meter long for cellular wireless system antenna (6 Nos.); NB 100 

medium class, 1.5 metre long for 0.6m to 1.2m diameter microwave antenna (6 Nos.) 

along with the fixtures/ clamps for leg mounting should be provided as per details given 

in the BoM. 


10.0 Verticality 

The verticality for towers of different heights shall be within the limits as per IS: 

12843:1989, Table: iii (b) (i) (i.e. the bottom of the line joining the centre of the top of 

the tower and the centre of the base of the tower shall be within the limits as given below. 

This shall be checked in the field after the erection of the tower at site. 

11.0 Earthing 

Tower Verticality limit 

21m within ± 21mm 

18m within ± 18mm 



Due to non-availability of space around the building, where only plate earth is provided, 

the down lead GI strip (50x3mm) bonded to any two opposite tower legs will be 

connected to two plate earths as per drawing around the building. The maximum value of 

earth resistance shall be 2 ohm in either case. Detailed specifications are provided in 

Chapter-3. Earthing material shall be in the scope of the tower suppliers. 

12.0 Welding 

Welding shall be done as per IS: 9595 (1996) and test for quality of welding will be 

carried as prescribed in the test schedule/test procedure. Welding connections of Base 

Plate shall be as per IS 800:1984. 

13.0 Marking 

Manufacture’s identity marking and item marking shall be provided on each section by 

punching & painting for Enabling easy assembly and trace -ability. Smaller elements, on 

which complete marking detail are not practicable, shall be supplied in suitable packing 

boxes and each box shall be clear marking details such as name of sites, height of the 

tower and other details as given above. However, part No. / Item No. shall be marked on 

all tower elements. The tower supplier shall also provide the tower component 

manufacturer’s identity / source. A plate indicating the manufacturer’s identity, year of 

manufacture, wind velocity and the maximum load capacity of the tower shall be 

supplied by the manufacturer for display at the bottom of the tower. The top horizontal 

members of the tower on all the four faces should have center clearly by visibly marked 

for easy check of vertically. 


14.0 Painting 

The tower shall be coloured with alternate bands of orange & white or red & white paint 

as per ICAO recommendations. The Ready mixed Paints, Primer, Enamel etc., used for 

tower painting, shall be as per the following IS codes: 

1. IS 2074 (1992): Ready Mixed Paint, Air Drying, Red Oxide Zinc Chrome, Priming- 

Specification; 

2. IS 2932 (1993): Enamel, Synthetic, Exterior: 

a. Undercoating 

b. Finishing – specification; 

3. IS 2933 (1975): Enamel exterior: 

a. Undercoating 

b. Finishing 

15.0 Documentation 

Two hard copies and one soft copy of complete documents along with installation details, 

in English, shall be supplied by the supplier. 

16.0 Weight of Tower 

21/18/15/12 m Tower (Tolerance in weight: ± 3%) 

a) Weight of Tower structures, inclusive of all parts of Superstructure (including base 

plate, anchor bolts, weight of antenna fixtures but excluding nuts, bolts and earth 

strip) are 3,872.69Kg, 3,345Kg, 2,876.47Kg and 2,507.71Kg for 21 metres, 18 

metres, 15 metres and 12 metres height of tower respectively. 

b) Weight of cellular wireless system antenna mounting arrangement (per antenna): 

33.48Kg. 

c) Weight of microwave antenna mounting arrangement (per antenna): 31.6 Kg (for 0.6 

m to 1.8 m dia.). 

17.0 Weight of Foundations 

21/18/15/12 m Tower Foundation 

a) Weights of reinforcement (including Stirrups & Binding wire) are 938.60Kg, 

938.60Kg, 690.50Kg and 692.10Kg for 21 metres, 18 metres, 15 metres and 12 metres 

height of tower respectively. 


18.0 Bill of Material 

19.0 Design 

The Bill of Material for all the towers is given in Chapter-2. 

The Elevation Drawings of Towers and Foundations shall be as per technical 

specification No. UTL/RTT/01-02 OCT 2011 of UTL. 

Notes: 

1. All the major components of material for tower shall be procured from the IS 

approved sources and certificate to this affect shall be given by manufacturer. 

2. All responsibility for tower erection shall lie with the supplier/erection agency which 

shall follow safety norms as per IS 7205(1974)". 

3. All IS standards are subject to revision and the most recent editions of the standards 

shall be applicable. 

4. All unspecified holes in tower members are 17.5mm diameter for 16 mm bolts 

conforming to Class 5.6. All unspecified plates 6 mm thick. 

5. Structural steel shall conform to IS 2062 grade-A with minimum yields stress of 

2550 kg/ sq. cm. 

6. Spring washers are to be used under each nut. 

7. Tower accessories include lightening protection system, grounding system 

(including plate earthing and ring earthing), earth strips, ladder, vertical and 

horizontal feeder support, antenna mounting structures, working and resting 

platform. 

8. Angular rotation & twist are less than 0.5º. 

9. Minimum thickness of the members considered is: 

Leg members 5 mm 

Lattices/ Belts 5 mm 

Redundant members 5 mm 

10. The foundation bolts at the base of the legs should be monolithic with the concrete in 

the foundation. 


Chapter-2 

Bill of Material for Roof Top Towers 

2.1 Bill of Material for 21 M Roof Top Tower 

Sl. No. DESCRIPTION COMPONENT SIZE QTY COF. NO. WEIGHT 

1. 

2. 

3. 

4. 

TOWER LEG 

HORIZONTAL 

BRACING 

DIAGONAL 

MEMBERS 

PANNEL TIE 

LEG_0 ISA 100 X 100 X 8 3.002 12.10 4.00 145.30 


LEG_2 ISA 100 X 100 X 6 3.002 9.20 4.00 110.47 

LEG_3 ISA 90 X 90 X 8 3.002 10.80 4.00 129.69 

LEG_4 ISA 90 X 90 X 6 3.004 8.20 4.00 98.53 

LEG_5 ISA 75 X 75 X 8 3.000 8.90 4.00 106.80 

LEG_6 ISA 75 X 75 X 6 2.402 6.80 4.00 65.33 

HB_0 ISA 50 X 50 X 6 2.195 4.50 4.00 39.51 

HB_1 

1.985 4.50 4.00 35.73 

HB_2 

1.775 4.50 4.00 31.95 

HB_3 

1.305 4.50 4.00 23.49 

HB_4 

1.097 4.50 4.00 19.75 

HB_5 

1.097 4.50 4.00 19.75 

HB_6 

1.097 4.50 4.00 19.75 

D_0 L ISA 50 X 50 X 6 3.64 4.50 4.00 65.52 

D_0 R 

3.64 4.50 4.00 65.52 

D_1 L 

3.502 4.50 4.00 63.04 

D_1 R 

3.502 4.50 4.00 63.04 

D_2 L 

3.375 4.50 4.00 60.75 

D_2 R 

3.375 4.50 4.00 60.75 

D_3 L 

2.161 4.50 4.00 38.90 

D_3 R 

2.161 4.50 4.00 38.90 

D_4 L 

2.081 4.50 4.00 37.46 

D_4 R 

2.081 4.50 4.00 37.46 

D_5 L 

2.002 4.50 4.00 36.04 

D_5 R 

2.002 4.50 4.00 36.04 

D_6 L 

1.926 4.50 4.00 34.67 

D_6 R 

1.926 4.50 4.00 34.67 

D_7 L 

1.9 4.50 4.00 34.20 

D_7 R 

1.9 4.50 4.00 34.20 

D_8 R 

1.911 4.50 4.00 34.40 

D_8 L 

1.911 4.50 4.00 34.40 

D_9 R 

1.911 4.50 4.00 34.40 

D_9 L 

1.911 4.50 4.00 34.40 

D_10 R 

1.911 4.50 4.00 34.40 

D_10 L 

1.911 4.50 4.00 34.40 

PT_0 ISA 40 X 40 X 5 1.537 3.80 4.00 23.36 

PT_1 

1.38 3.80 4.00 20.98 

PT_2 

1.241 3.80 4.00 18.86 

PT_3 

1.029 3.80 4.00 15.64 

PT_4 

0.883 3.80 4.00 13.42 

PLT 5 MM CHQ PL 1.72 40.00 1.00 68.80 

PT_5 

0.883 3.80 4.00 13.42 



5. 

6. 

7. 

8. 

9. 

LADDER 

SUPPORT 

ANGLE 

LSA PLATE 

BRACING 

PLATE 

LEG JOINT 

LADDER 

LSA_0 ISA 50 X 50 X 6 2.213 4.50 1.00 9.96 

LSA_1 

2.003 4.50 1.00 9.01 

LSA_2 

1.793 4.50 1.00 8.07 

LSA_3 

1.495 4.50 1.00 6.73 

LSA_4 

1.287 4.50 1.00 5.79 

LSA_5 

1.287 4.50 2.00 11.58 

LSA_6 

1.287 4.50 1.00 5.79 

LSA_0 50 X 6 FLAT 0.0073 47.10 2.00 0.69 

LSA_1 

0.0073 47.10 2.00 0.69 

LSA_2 

0.0073 47.10 2.00 0.69 

LSA_3 

0.0073 47.10 2.00 0.69 

LSA_4 

0.0073 47.10 2.00 0.69 

LSA_5 

0.0073 47.10 4.00 1.38 

LSA_6 

0.0073 47.10 2.00 0.69 

PLATE 0 6 MM THK. 0.060772986 47.10 8.00 22.90 

PLATE 1 

0.060772986 47.10 8.00 22.90 

PLATE 2 

0.049519511 47.10 8.00 18.66 

PLATE 3 

0.037922703 47.10 8.00 14.29 

PLATE 4 

0.046309942 47.10 8.00 17.45 

PLATE 5 

0.037944165 47.10 8.00 14.30 

PLATE 6 

0.051994472 47.10 8.00 19.59 

PLATE 7 

0.037165765 47.10 8.00 14.00 

PLATE 8 

0.042956451 47.10 8.00 16.19 

PLATE 9 

0.042946765 47.10 8.00 16.18 

PLATE 10 

0.022632802 47.10 8.00 8.53 

LJ_0 ISF 100 X 6 0.0513 47.10 8.00 19.33 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_1 ISF 100 X 6 0.0513 47.10 8.00 19.33 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_2 ISF 100 X 6 0.0517 47.10 8.00 19.48 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_3 ISF 100 X 6 0.0513 47.10 8.00 19.33 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_4 ISF 90 X 6 0.04653 47.10 8.00 17.53 

ISA 75 X 75 X 6 0.517 6.80 4.00 14.06 

LJ_5 ISF 90 X 6 0.04635 47.10 8.00 17.46 

ISA 75 X 75 X 6 0.515 6.80 4.00 14.01 

LJ_5 ISF 75 X 6 0.038625 47.10 8.00 14.55 

ISA 75 X 75 X 6 0.513 6.80 4.00 13.95 

LD_5 ISA 50 X 50 X 6 3.252 4.50 2.00 29.27 

Ø 16 MM ROD 0.4 1.58 11.00 6.95 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_4 ISA 50 X 50 X 6 3.252 4.50 2.00 29.27 

Ø 16 MM ROD 0.4 1.58 11.00 6.95 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 



10. 

11. 

12. 

13. 

14. 


16. 

17. 

FEEDER 

CABLE 

BRACKET 

LADDER 

LD_3 ISA 50 X 50 X 6 3.9 4.50 2.00 35.10 

Ø 16 MM ROD 0.4 1.58 13.00 8.22 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_2 ISA 50 X 50 X 6 4.5 4.50 2.00 40.50 

Ø 16 MM ROD 0.4 1.58 15.00 9.48 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_1 ISA 50 X 50 X 6 4.5 4.50 2.00 40.50 


ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_0 ISA 50 X 50 X 6 2.672 4.50 2.00 24.05 

Ø 16 MM ROD 0.4 1.58 9.00 5.69 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

FCB ISF 40 X 5 0.0435 39.25 28.00 47.81 

CAGE 

CAGE 

CG ISF25 X 5 0.043 39.25 32.00 54.01 

SUPPORT 

STRIP 

CGS ISF25 X 5 0.4 22.00 3.00 26.40 

BRACKET ISA 50 X 50 X 6 0.345 4.50 8.00 12.42 

RING 

Ø 40 MM NB 

PIPE 

6.2 3.80 2.00 47.12 

AMS 

U-BOLT Ø 12 MM ROD 0.46 0.89 12.00 4.91 

(SECTORIAL) U-BOLT 

SUPPORT ISA 40 X 40 X 5 0.15 3.80 12.00 6.84 

BOOM Ø 65 NB 3 7.20 6.00 129.60 

BRACKET ISMC 75 1.15 6.80 12.00 93.84 

MW 

LONG BOLT Ø 12 MM X 150 0 0.30 24.00 7.20 

(SECTORIAL) BOOM Ø 100 NB 1.5 12.10 6.00 108.90 


LEG ISA 100 X 100 X 8 0.602 12.10 4.00 29.14 

BASE PLATE 300 X 300 X 25 0.09 196.25 4.00 70.65 

RIB PLATE 12 MM THK 0.052 94.20 8.00 39.19 

BASE LEG ANCHORE 

BOLT 

Ø 32 MM 0.575 6.35 16.00 58.42 

NUT & 

WAHSERS 

Ø 32 MM 

2.25 32.00 72.00 

EXTERNAL 

FEEDER RACK AS PER DWG. 

10.00 12.50 125.00 

FOUNDATION AS PER DWG. ISA 50 X 50 X 6 13.396 4.50 1.00 60.28 

TEMPLATE 

3 MM SHEET 0.09 23.55 4.00 8.48 

Total Weight of Tower Including Accessories 3,872.69 

NUT BOLT WASHER 276.00 

TOTAL WEIGHT 4,148.69 

UTL/RTT/02-01 OCT 2011 Page 12 of 31

2.1.1 Details of Nuts, Bolts & Washers for 21 Metres Roof Top Tower. 

Sl. No. Size Description Item Quantity 

LEG & BRACING NBW 1,520.00 

1. Ø16 X 50 AT PLAN 

78.00 

AT LSA 

36.00 

2. Ø12 X 40 

LADDER/BRACKET/CAGE NBW 136.00 

153.00 

3. Ø12 

SECTOR AMS (RING) 

SECTOR AMS (BOOM) 

NUT/WASHER 16.00 

24.00 


MW AMS (RING) 


NUT/WASHER 24.00 

24.00 

5. Ø32 ANCHOR BOLT NUT/WASHER 48.00 

Summary of Nuts, Bolts & Washers. 

Sl. No. Size Item Quantity Weight/Piece Total Weight (in Kg.) 

1. Ø16 X 50 NBW 1,634.00 0.143 233.66 

2. Ø12 X 40 NBW 289.00 0.098 28.32 

3. Ø12 NW 88.00 0.020 1.76 

4. Ø32 NW 48.00 0.250 12.00 

Total Weight 275.74 ≈ 276.00 


2.1.2 Bill of Material for Foundation for 21 Metres Roof Top Tower 

Sl. No. DESCRIPTION QTY NO. Total/QTY 

1. RCC B2 0.49 2 0.980 

2. RCC B1 0.552 2 1.104 

3. RCC CL 0.036 4 0.144 

Quantity (In Cubic Metres) 2.23 

Reinforcement Details 

1. REINFORCEMENT B1 Ø 25 MM 4.85 16 299.25 


3. BEAM JUCTION Ø 25 MM 8.152 4 125.74 

4. COLUMN EXTENTION Ø 16 MM 0.8 24 30.34 

Stirrups 

1. STIRRUPS Ø 8 MM BEAM 1 122.2 2 96.51 

2. STIRRUPS Ø 8 MM BEAM 2 98.568 2 77.85 

3. STIRRUPS Ø 8 MM CL 10.4 4 16.43 

4. STIRRUPS BEAM JUCTION Ø 8 MM 10.4 4 16.43 

Total Weight of Reinforcement Excluding Binding Wire 893.91 

1. BINDING WIRE 5% 

UTL/RTT/02-01 OCT 2011 Page 14 of 31 

44.70 

Total Weight of Reinforcement (Including Stirrups & Binding Wire) 938.60 

TOTAL RCC (In Cubic Metres) 2.23 

TOTAL REINFORCEMENT (In Kgs.) 938.60

2.2 Bill of Material for 18 M Roof Top Tower 


1. 

2. 

3. 

4. 

5. 

TOWER LEG 

HORIZONTAL 

BRACING 

DIAGONAL 

MEMBERS 

PANNEL TIE 

LADDER 

SUPPORT 

ANGLE 


LEG_2 ISA 100 X 100 X 6 3.002 9.20 4.00 110.47 

LEG_3 ISA 90 X 90 X 8 3.002 10.80 4.00 129.69 

LEG_4 ISA 90 X 90 X 6 3.004 8.20 4.00 98.53 

LEG_5 ISA 75 X 75 X 8 3 8.90 4.00 106.80 

LEG_6 ISA 75 X 75 X 6 2.402 6.80 4.00 65.33 

HB_1 ISA 50 X 50 X 6 1.985 4.50 4.00 35.73 

HB_2 1.775 4.50 4.00 31.95 

HB_3 1.305 4.50 4.00 23.49 

HB_4 1.097 4.50 4.00 19.75 

HB_5 1.097 4.50 4.00 19.75 

HB_6 1.097 4.50 4.00 19.75 

D_1 L ISA 50 X 50 X 6 3.502 4.50 4.00 63.04 

D_1 R 3.502 4.50 4.00 63.04 

D_2 L 3.375 4.50 4.00 60.75 

D_2 R 3.375 4.50 4.00 60.75 

D_3 L 2.161 4.50 4.00 38.90 

D_3 R 2.161 4.50 4.00 38.90 

D_4 L 2.081 4.50 4.00 37.46 

D_4 R 2.081 4.50 4.00 37.46 

` 2.002 4.50 4.00 36.04 

D_5 R 2.002 4.50 4.00 36.04 

D_6 L 1.926 4.50 4.00 34.67 

D_6 R 1.926 4.50 4.00 34.67 

D_7 L 1.9 4.50 4.00 34.20 

D_7 R 1.9 4.50 4.00 34.20 

D_8 R 1.911 4.50 4.00 34.40 

D_8 L 1.911 4.50 4.00 34.40 

D_9 R 1.911 4.50 4.00 34.40 

D_9 L 1.911 4.50 4.00 34.40 

D_10 R 1.911 4.50 4.00 34.40 

D_10 L 1.911 4.50 4.00 34.40 

PT_1 ISA 40 X 40 X 5 1.38 3.80 4.00 20.98 

PT_2 1.241 3.80 4.00 18.86 

PT_3 1.029 3.80 4.00 15.64 

PT_4 0.883 3.80 4.00 13.42 

PLT 5 MM CHQ PL 1.72 40.00 1.00 68.80 

PT_6 0.883 3.80 4.00 13.42 

LSA_1 ISA 50 X 50 X 6 2.003 4.50 1.00 9.01 

LSA_2 1.793 4.50 1.00 8.07 

LSA_3 1.495 4.50 1.00 6.73 

LSA_4 1.287 4.50 1.00 5.79 

LSA_5 1.287 4.50 2.00 11.58 

LSA_6 1.287 4.50 1.00 5.79 

6. LSA PLATE LSA_1 50 X 6 FLAT 0.0073 47.10 2.00 0.69 

UTL/RTT/02-01 OCT 2011 Page 15 of 31


7. 

8. 

9. 

BRACING 

PLATE 

LEG JOINT 

LADDER 

LSA_2 0.0073 47.10 2.00 0.69 

LSA_3 0.0073 47.10 2.00 0.69 

LSA_4 0.0073 47.10 2.00 0.69 

LSA_5 0.0073 47.10 4.00 1.38 

LSA_6 0.0073 47.10 2.00 0.69 

PLATE 1 6 MM THK. 0.060772986 47.10 8.00 22.90 

PLATE 2 0.049519511 47.10 8.00 18.66 

PLATE 3 0.037922703 47.10 8.00 14.29 

PLATE 4 0.046309942 47.10 8.00 17.45 

PLATE 5 0.037944165 47.10 8.00 14.30 

PLATE 6 0.051994472 47.10 8.00 19.59 

PLATE 7 0.037165765 47.10 8.00 14.00 

PLATE 8 0.042956451 47.10 8.00 16.19 

PLATE 9 0.042946765 47.10 8.00 16.18 

PLATE 10 0.022632802 47.10 8.00 8.53 

LJ_1 ISF 100 X 6 0.0513 47.10 8.00 19.33 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_2 ISF 100 X 6 0.0517 47.10 8.00 19.84 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_3 ISF 100 X 6 0.0513 47.10 8.00 19.33 

ISA 90 X 90 X 6 0.513 8.20 4.00 16.83 

LJ_4 ISF 90 X 6 0.04653 47.10 8.00 17.53 

ISA 75 X 75 X 6 0.517 6.80 4.00 14.06 

LJ_5 ISF 90 X 6 0.04635 47.10 8.00 17.46 

ISA 75 X 75 X 6 0.515 6.80 4.00 14.01 

LJ_5 ISF 75 X 6 0.038625 47.10 8.00 14.55 

ISA 75 X 75 X 6 0.513 6.80 4.00 13.95 

LD_5 ISA 50 X 50 X 6 3.252 4.50 2.00 29.27 

Ø 16 MM ROD 0.4 1.58 11.00 6.95 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_4 ISA 50 X 50 X 6 3.9 4.50 2.00 35.10 

Ø 16 MM ROD 0.4 1.58 13.00 8.22 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_3 ISA 50 X 50 X 6 4.5 4.50 2.00 40.50 


ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_2 ISA 50 X 50 X 6 4.5 4.50 2.00 40.50 


ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 

LD_1 ISA 50 X 50 X 6 2.672 4.50 2.00 24.05 

Ø 16 MM ROD 0.4 1.58 9.00 5.69 

ISA 40 X 40 X 5 0.19 3.80 2.00 1.44 

ISF 50 X 5 0.0095 39.25 4.00 1.49 


Sl. No. DESCRIPTION 

FEEDER 

COMPONENT SIZE QTY COF. NO. WEIGHT 

10. CABLE 

BRACKET 

FCB ISF 40 X 5 0.0435 39.25 20.00 34.15 

11. 

LADDER 

CAGE 

CAGE 

CG ISF25 X 5 0.032375 39.25 35.00 44.48 

12. SUPPORT 

STRIP 

CGS ISF25 X 5 0.4 39.25 3.00 47.10 

BRACKET ISA 50 X 50 X 6 

Ø 40 MM NB 

0.345 4.50 8.00 12.42 

RING 

PIPE 6.2 3.80 2.00 47.12 

13. AMS 

(SECTORIAL) 

U-BOLT 

U-BOLT 

SUPPORT 

Ø 12 MM ROD 

ISA 40 X 40 X 5 

0.46 

0.15 

0.89 

3.80 

12.00 


4.91 

6.84 

BOOM Ø 65 NB 3 7.20 6.00 129.60 

BRACKET ISMC 75 1.15 6.80 12.00 93.84 

14. MW 

(SECTORIAL) 

LONG BOLT 

BOOM 

Ø 12 MM X 150 

Ø 100 NB 

0 

1.5 

0.30 


24.00 

6.00 

7.20 

108.90 


LEG ISA 100 X 100 X 8 0.602 12.10 4.00 29.14 

BASE PLATE 300 X 300 X 25 0.09 196.25 4.00 70.65 

RIB PLATE 12 MM THK 0.052 94.20 8.00 39.19 

15. BASE LEG ANCHORE 

BOLT 

NUT & 

Ø 32 MM 0.575 6.35 16.00 58.42 

EXTERNAL 

WAHSERS Ø 32 MM 

36.00 0.00 

16. FEEDER RACK AS PER DWG. 

10.00 12.50 125.00 

17. 

FOUNDATION 

TEMPLATE 

AS PER DWG. ISA 50 X 50 X 6 

3 MM SHEET 


0.09 

4.50 

23.55 

1.00 

4.00 


8.48 

Total Weight Including Accessories 3,345.00 

Nut Bolt Washer 243.00 

Total Weight 3,588.00 

2.2.1 Details of Nuts, Bolts & Washers 


LEG & BRACING NBW 1,360 


66 

AT LSA 

28 

2. Ø12 X 40 LADDER/BRACKET/CAGE 

104 

105 




NUT/WASHER 16 

24 


MW AMS (RING) 


NUT/WASHER 24 

24 

5. Ø32 ANCHOR BOLT NUT/WASHER 48 


Summary of Nuts, Bolts & Washers 

Sl. No. Size Item Quantity Weight/Piece 

Total Weight 

(In Kgs) 

1. Ø16 X 50 NBW 1,454 0.143 207.92 

2. Ø12 X 40 NBW 209 0.098 20.48 

3. Ø12 NW 88 0.02 1.76 

4. Ø32 NW 48 0.25 12 

Total Weight 242.16 ≈ 243.00 

2.2.2 Bill of Material for Foundation for 18 Metres Roof Top Tower 

Sl. No. DESCRIPTION QTY NO. T/QTY 

1. RCC B2 0.49 2 0.980 

2. RCC B1 0.552 2 1.104 

3. RCC CL 0.036 4 0.144 





3. BEAM JUCTION Ø 25 MM 8.152 4 125.74 


Stirrups 







UTL/RTT/02-01 OCT 2011 Page 18 of 31 

44.70 






LEG_1 ISA 100 X 100 X 6 3.002 9.20 4 110.47 

LEG_2 ISA 90 X 90 X 8 3.002 10.80 4 129.69 

1. TOWER LEG LEG_3 ISA 90 X 90 X 6 3.004 8.20 4 98.53 

LEG_4 ISA 75 X 75 X 8 3 8.90 4 106.80 

LEG_5 ISA 75 X 75 X 6 2.402 6.80 4 65.33 

HB_1 ISA 50 X 50 X 6 1.775 4.50 4 31.95 

2. 

HORIZONTAL 

BRACING 

HB_2 

HB_3 

HB_4 

1.305 

1.097 

1.097 

4.50 

4.50 

4.50 

4 

4 

4 

23.49 

19.75 

19.75 

HB_5 1.097 4.50 4 19.75 

D_1 L ISA 50 X 50 X 6 3.375 4.50 4 60.75 

D_1 R 3.375 4.50 4 60.75 

D_2 L 2.161 4.50 4 38.90 

D_2 R 2.161 4.50 4 38.90 

D_3 L 2.081 4.50 4 37.46 

D_3 R 2.081 4.50 4 37.46 

D_4 L 2.002 4.50 4 36.04 

D_4 R 2.002 4.50 4 36.04 

3. 

DIAGONAL 

MEMBERS 

D_5 L 

D_5 R 

1.926 

1.926 

4.50 

4.50 

4 

4 

34.67 

34.67 

D_6 L 1.9 4.50 4 34.20 

D_6 R 1.9 4.50 4 34.20 

D_7 R 1.911 4.50 4 34.40 

D_7 L 1.911 4.50 4 34.40 

D_8 R 1.911 4.50 4 34.40 

D_8 L 1.911 4.50 4 34.40 

D_9 R 1.911 4.50 4 34.40 

D_9 L 1.911 4.50 4 34.40 

PT_1 ISA 40 X 40 X 5 1.241 3.80 4 18.86 

PT_2 1.029 3.80 4 15.64 

4. PANNEL TIE PT_3 0.883 3.80 4 13.42 

PLT 5 MM CHQ PL 1.72 40.00 1 68.80 

PT_5 0.883 3.80 4 13.42 

LSA_1 ISA 50 X 50 X 6 1.793 4.50 1 8.07 

LADDER LSA_2 1.495 4.50 1 6.73 

5. SUPPORT LSA_3 1.287 4.50 1 5.79 

ANGLE LSA_4 1.287 4.50 2 11.58 

LSA_5 1.287 4.50 1 5.79 

LSA_1 50 X 6 FLAT 0.0073 47.10 2 0.69 

6. LSA PLATE LSA_2 0.0073 47.10 2 0.69 

LSA_3 0.0073 47.10 2 0.69 



LSA_4 0.0073 47.10 4 1.38 

LSA_5 0.0073 47.10 2 0.69 

7. 

BRACING 

PLATE 

8. LEG JOINT 

9. LADDER 

10. 

11. 


FEEDER 

CABLE 

BRACKET 

LADDER 

CAGE 

CAGE 

SUPPORT 

STRIP 

PLATE 1 6 MM THK. 0.04951951 47.10 8 18.66 

PLATE 2 0.0379227 47.10 8 14.29 

PLATE 3 0.04630994 47.10 8 17.45 

PLATE 4 0.03794417 47.10 8 14.30 

PLATE 5 0.05199447 47.10 8 19.59 

PLATE 6 0.03716577 47.10 8 14.00 

PLATE 7 0.04295645 47.10 8 16.19 

PLATE 8 0.04294677 47.10 8 16.18 

PLATE 9 0.0226328 47.10 8 8.53 

LJ_1 ISF 100 X 6 0.0513 47.10 8 19.33 

ISA 90 X 90 X 6 0.513 8.20 4 16.83 

LJ_2 ISF 100 X 6 0.0517 47.10 8 19.48 

ISA 90 X 90 X 6 0.513 8.20 4 16.83 

LJ_3 ISF 90 X 6 0.04653 47.10 8 17.53 

ISA 75 X 75 X 6 0.517 6.80 4 14.06 

LJ_4 ISF 90 X 6 0.04635 47.10 8 17.46 

ISA 75 X 75 X 6 0.515 6.80 4 14.01 

LJ_5 ISF 75 X 6 0.038625 47.10 8 14.55 

ISA 75 X 75 X 6 0.513 6.80 4 13.95 

LD_4 ISA 50 X 50 X 6 3.252 4.50 2 29.27 

Ø 16 MM ROD 0.4 1.58 11 6.95 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

LD_3 ISA 50 X 50 X 6 3.9 4.50 2 35.10 

Ø 16 MM ROD 0.4 1.58 13 8.22 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

LD_2 ISA 50 X 50 X 6 4.5 4.50 2 40.50 

Ø 16 MM ROD 0.4 1.58 15 9.48 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

LD_1 ISA 50 X 50 X 6 4.274 4.50 2 38.47 

Ø 16 MM ROD 0.4 1.58 11 6.95 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

FCB ISF 40 X 5 0.0435 39.25 15 25.61 

CG ISF25 X 5 0.032375 39.25 30 38.12 

CGS ISF25 X 5 0.325 39.25 3 38.27 



13. 

14. 

AMS 

(SECTORIAL) 

AMS 

(SECTORIAL) 

15. BASE LEG 

16. 

17. 

EXTERNAL 

FEEDER RACK 

FOUNDATION 

TEMPLATE 


BRACKET ISA 50 X 50 X 6 0.345 4.50 8 12.42 

RING 

Ø 40 MM NB 

PIPE 

6.2 3.80 2 47.12 

U-BOLT Ø 12 MM ROD 0.46 0.89 12 4.91 

U-BOLT 

SUPPORT 

ISA 40 X 40 X 5 0.15 3.80 12 6.84 

BOOM Ø 65 NB 3 7.20 6 129.60 

BRACKET ISMC 75 1.15 6.80 12 93.84 

LONG BOLT Ø 12 MM X 150 0 0.30 24 7.20 

BOOM Ø 100 NB 1.5 12.10 6 108.90 


LEG ISA 100 X 100 X 6 0.602 9.20 4 22.15 

BASE PLATE 300 X 300 X 25 0.09 

196.2 

5 

4 70.65 

RIB PLATE 12 MM THK 0.052 94.20 8 39.19 

ANCHORE 

BOLT 

Ø 32 MM 0.575 6.35 16 58.42 

NUT & 

WAHSERS 

Ø 32 MM 

36 0.00 

AS PER DWG. 

10.00 


0 


AS PER DWG. ISA 50 X 50 X 6 11.42 4.50 1.00 51.39 

3 MM SHEET 0.09 23.55 4.00 8.48 


Nut Bolt Washer 212.00 



LEG & BRACING NBW 1,184 


58 

AT LSA 

28 

2. Ø12 X 40 LADDER/BRACKET/CAGE 

80 

84 




NUT/WASHER 16 

24 


MW AMS (RING) 


NUT/WASHER 24 

24 





Total Weight 

(In Kgs.) 

1. Ø16 X 50 NBW 1270 0.143 181.61 

2. Ø12 X 40 NBW 164 0.098 16.072 



Total Weight 211.442 ≈ 212.00 


Sl. No. DESCRIPTION QTY NO. T/QTY 

1. RCC B2 0.49 2 0.98 

2. RCC B1 0.552 2 1.10 

3. RCC CL 0.036 4 0.14 





3. BEAM JUCTION Ø 25 MM 8.152 4 80.48 


Stirrups 






1. BINDING WIRE 5% 32.88 



TOTAL REINFORCEMENT (In Kgs.) 690.50 




LEG_1 ISA 90 X 90 X 8 3.002 10.80 4 129.69 

1. TOWER LEG 

LEG_2 

LEG_3 

ISA 90 X 90 X 6 

ISA 75 X 75 X 8 

3.004 

3 

8.20 

8.90 

4 

4 

98.53 

106.80 

LEG_4 ISA 75 X 75 X 6 2.402 6.80 4 65.33 

HB_2 ISA 50 X 50 X 6 1.305 4.50 4 23.49 

2. 

HORIZONTAL 

BRACING 

HB_3 

HB_4 

1.097 

1.097 

4.50 

4.50 

4 

4 

19.75 

19.75 

HB_5 1.097 4.50 4 19.75 

D_1 L ISA 50 X 50 X 6 2.161 4.50 4 38.90 

D_1 R 2.161 4.50 4 38.90 

D_2 L 2.081 4.50 4 37.46 

D_2 R 2.081 4.50 4 37.46 

D_3 L 2.002 4.50 4 36.04 

D_3 R 2.002 4.50 4 36.04 

D_4 L 1.926 4.50 4 34.67 

3. 

DIAGONAL 

MEMBERS 

D_4 R 

D_5 L 

1.926 

1.9 

4.50 

4.50 

4 

4 

34.67 

34.20 

D_5 R 1.9 4.50 4 34.20 

D_6 R 1.911 4.50 4 34.40 

D_6 L 1.911 4.50 4 34.40 

D_7 R 1.911 4.50 4 34.40 

D_7 L 1.911 4.50 4 34.40 

D_8 R 1.911 4.50 4 34.40 

D_8 L 1.911 4.50 4 34.40 

PT_1 ISA 40 X 40 X 5 1.029 3.80 4 15.64 

4. PANNEL TIE 

PT_2 

PLT 5 MM CHQ PL 

0.883 

1.72 

3.80 

40.00 

4 

1 

13.42 

68.80 

PT_4 0.883 3.80 4 13.42 

5. 

LADDER 

SUPPORT 

ANGLE 

LSA_1 

LSA_2 

LSA_3 

LSA_4 

ISA 50 X 50 X 6 1.495 

1.287 

1.287 

1.287 

4.50 

4.50 

4.50 

4.50 

1 

1 

2 

1 

6.73 

5.79 

11.58 

5.79 

LSA_1 50 X 6 FLAT 0.0073 47.10 2 0.69 

6. LSA PLATE 

LSA_2 

LSA_3 

0.0073 

0.0073 

47.10 

47.10 

2 

4 

0.69 

1.38 

LSA_4 0.0073 47.10 2 0.69 

PLATE 1 6 MM THK. 0.037922703 47.10 8 14.29 

PLATE 2 0.046309942 47.10 8 17.45 

7. 

BRACING 

PLATE 

PLATE 3 

PLATE 4 

0.037944165 

0.051994472 

47.10 

47.10 

8 

8 

14.30 

19.59 

PLATE 5 0.037165765 47.10 8 14.00 

PLATE 6 0.042956451 47.10 8 16.19 



PLATE 7 0.042946765 47.10 8 16.18 

PLATE 8 0.022632802 47.10 8 8.53 

LJ_1 ISF 100 X 6 0.0513 47.10 8 19.33 

ISA 90 X 90 X 6 0.513 8.20 4 16.83 

LJ_2 ISF 90 X 6 0.04653 47.10 8 17.53 

8. LEG JOINT 

LJ_3 

ISA 75 X 75 X 6 

ISF 90 X 6 

0.517 

0.04635 

6.80 

47.10 

4 

8 

14.06 

17.46 

ISA 75 X 75 X 6 0.515 6.80 4 14.01 

LJ_4 ISF 75 X 6 0.038625 47.10 8 14.55 

ISA 75 X 75 X 6 0.513 6.80 4 13.95 

LD_4 ISA 50 X 50 X 6 3.252 4.50 2 29.27 

Ø 16 MM ROD 0.4 1.58 11 6.95 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

LD_3 ISA 50 X 50 X 6 3.9 4.50 2 35.10 

Ø 16 MM ROD 0.4 1.58 13 8.22 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

9. LADDER 

LD_2 

ISF 50 X 5 

ISA 50 X 50 X 6 

0.0095 

4.5 

39.25 

4.50 

4 

2 

1.49 

40.50 

Ø 16 MM ROD 0.4 1.58 15 9.48 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

ISF 50 X 5 0.0095 39.25 4 1.49 

LD_1 ISA 50 X 50 X 6 4.274 4.50 2 38.47 

Ø 16 MM ROD 0.4 1.58 11 6.95 

ISA 40 X 40 X 5 0.19 3.80 2 1.44 

FEEDER 

ISF 50 X 5 0.0095 39.25 4 1.49 

10. CABLE 

BRACKET 

FCB ISF 40 X 5 0.0435 39.25 12 20.49 

11. 

LADDER 

CAGE 

CAGE 

CG ISF25 X 5 0.032375 39.25 24 30.50 

12. SUPPORT 

STRIP 

CGS ISF25 X 5 0.275 39.25 3 32.38 

BRACKET ISA 50 X 50 X 6 0.345 4.50 8 12.42 

13. 

AMS 

(SECTORIAL) 

RING 

U-BOLT 

U-BOLT 

SUPPORT 

Ø 40 MM NB 

PIPE 

Ø 12 MM ROD 

ISA 40 X 40 X 

5 

6.2 

0.46 


3.80 

0.89 

3.80 

2 

12 

12 


4.91 

6.84 

BOOM Ø 65 NB 3 7.20 6 129.60 

14. 

AMS 

(SECTORIAL) 

BRACKET ISMC 75 1.15 6.80 12 93.84 

LONG BOLT Ø 12 MM X 150 0 0.30 24 7.20 

BOOM Ø 100 NB 1.5 12.10 6 108.90 


15. BASE LEG LEG ISA 100 X 100 0.602 9.20 4 22.15 



BASE PLATE 

X 6 

300 X 300 X 25 0.09 196.25 4 70.65 

RIB PLATE 12 MM THK 0.052 94.20 8 39.19 

ANCHORE 

BOLT 

Ø 32 MM 0.575 6.35 16 58.42 

NUT & 

WAHSERS 

Ø 32 MM 

36 0.00 

16. 

EXTERNAL 

FEEDER RACK 

AS PER DWG. 

10.00 


0 


17. 

FOUNDATION 

TEMPLATE 

AS PER DWG. ISA 50 X 50 X 6 10.62 4.50 1 47.77 

3 MM SHEET 0.09 23.55 4 8.48 


Nut Bolt Washer 182.00 




1. 

2. 

Ø16 X 

50 

Ø12 X 

40 



LEG & BRACING NBW 1016 

AT PLAN 50 

AT LSA 24 

LADDER/BRACKET/CAGE 54 

66 

SECTOR AMS (RING) NUT/WASHER 16 

SECTOR AMS (BOOM) 24 

MW AMS (RING) NUT/WASHER 24 

SECTOR AMS (BOOM) 24 




Total 

Weight 

(In Kgs) 

1. Ø16 X 50 NBW 1090 0.143 155.87 

2. Ø12 X 40 NBW 120 0.098 11.76 



Total Weight 

181.39 ≈ 




Sl. No. DESCRIPTION QTY NO T/QTY 

1. RCC B2 0.315 2 0.63 

2. RCC B1 0.483 2 0.97 

3. RCC CL 0.036 4 0.14 





3. BEAM JUCTION Ø 25 MM 8.152 4 80.48 


Stirrups 








32.96 




Notes: 

Chapter-3 

Specifications for Earthing System & Lightening Arrestor 

Plate Earth 

(Layout & interconnection) 

Figure – 1 

(Diagram not to Scale) 

a. GI Plates and Strips are connected by GI nuts and Bolts to prevent ingress of moisture 

and soil. The joint is made watertight by covering with bitumen. 

b. The bends in GI strips should not be sharp but within radius of 1 meter as shown in figure 

1. 

c. After the plate earthing electrode is placed in position and all the interconnection made, 

the pit shall be filled up with fine ash and/or finely sieved good quality soil, which shall 

be rammed in layers so that it is compact and cohesive. 

d. Chemical treatment of earth using salts etc. are not recommended as the chemical 

treatment does not last long and needs to be checked periodically. 


To Plate Earth 

e. Earth conductor should not be encircled with metal clamps while taking it along the wall. 

This is essential to eliminate the high inductive reactance that will impede the flow of 

surge current along the conductor in case of lightning. 

f. Earthing conductor shall not pass through any metallic conduit or pipe as this will 

increase surge impedance. 

OUTDOOR 

GROUNDING 

BUS BAR 

To Plate Earth 

TOWER PLATEFORM 

FEEDER GROUNDING CARD 

FEEDER 

LIGHTENING 

ARRESTER 

MOUNT 

GROUNDING 

WIRE 

Figure – 2 

LIGHTENING 

ARRESTER 

MOUNT 

INDOOR 

GROUNDING 

BUS BAR 

GROUNDING STRIP 50 mmX3 mm 

Earthing arrangement using outdoor grounding 

Bus bar and indoor grounding bus bar 

GROUNDING WIRE 


BTS 

SMPS

3.1 The bidder shall provide two numbers of GI plate earth (one for Tower and the other for 

equipment) located at least 3 metre apart and shall be connected by 50mm x 3mm GI strip 

for maintaining common potential (Figure-2). Each plate earth system shall have ohmic 

value ≤2Ω. 

3.2 Each earth plate (Figure-1) shall include excavation of pit of size 1000x1000x2000mm in 

all kinds of soils and placing four numbers of GI plates of size 300x300x6 mm vertically at 

diagonally opposite ends in the excavated pit and inter connecting the plates with 4 Nos. of 

50x3mm G I strips with 2 Nos. of GI bolts and nuts of 10mm dia. at each connection and 

covering the joints with bitumen, placing GI pipe of 50mm internal diameter (B Class) and 

2000mm length at the center of the plate grid for watering and filling the pit with fine ash 

and / or finally sieved good quality soil including ramming in 20 cm layers etc. complete 

and cover the pit with 750x750x50mm thick precast reinforced cement concrete slab having 

100mm dia. hole at the centre to pass the GI pipe and construct a chamber of internal size 

not less than 280x280x250mm with half brick wall including fixing CI manhole cover of 

size 300x300mm of weight not less than 7.20 Kg. (cover & frame) and plastering the 

chamber on all sides with cement mortar 1:4 of 12mm thick (1 cement : 4 fine sand) and 

including disposal of surplus excavated earth if any. 

3.3 The bidder shall provide GI strips of size 50x3 mm one end connected to the tower leg with 

GI bolts and nuts [with lead sheath in between] at the bottom of the tower and the other end 

shall be connected to the GI plate earth with GI bolts and nuts [with lead sheath in between] 

including clamping the down lead flat to walls/stems without any sharp bends using 

necessary clamps and screws. 

3.4 The bidder shall provide GI bus bar of 50 x 3 mm or 50sq. mm Copper cable (PVC 

insulated) connected to the lightning conductor and to the leg of tower (where one plate 

earth is terminated) with 2 Nos. of 10 mm diameter GI nuts & bolts [with lead sheath in 

between] at each connection. The bus bar shall be drawn through heat shrink sleeve and 

shall be shrunk properly. The bus bar/cable shall be clamped to the tower walls at uniform 

interval of 1.5 M. using proper clamps and insulators such that the bus bar shall be well 

insulated from the tower/building walls all complete. 

3.5 The bidder shall terminate separate earth strips from the two earth pits up to indoor and 

outdoor grounding bus bar (i.e. one earth strip from first pit to indoor grounding bus bar 

and another from second earth pit to outdoor grounding bus bar) as per figure-2. 

*** 


Chapter-4 

Technical Specifications for Aviation Warning Light 

1. No. of LEDS: at least 170. 

2. Maximum forward current: 45 mA 

3. Input Voltage Variability: Shall withstand fluctuation of ±25% 

4. Power Consumption: 5 W to 15 W (48V DC Supply) 

5. PIV protection: LEDs internally protected against rev. voltage up to 1 KV 

6. Insulation Resistance: >200 MΩ 

7. Dielectric Strength: ≥2.5 KV 

8. Earthing: Terminal shall be provided inside body 

9. Body Material: Aluminum body with powder coating 

10. Dome Material: Polycarbonate unbreakable red dome 

11. Cable entry: PG11 cable gland 

12. Photo senser: Inbuilt photosensor for automatic operation 

13. Illuminance: ≥3000 lux 

14. No. of Circuits: Multiple Circuits provided for maximum reliability. 

15. Type of LEDS: Ultra high glow LEDs 

16. Warranty: 36 months 

Note: Screened PVC insulated twin copper wire of size 3/22 IS Mark shall be provided 

by Supplier. The length of Wire may be considered as 30m on an average for each Site. 


Chapter-5 

Key Diagrams

Technical Specification of Roof Top Tower of 12, 15, 18 & 21m height

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