Cost comparison of one unit of Marconite concrete electrode, considering surface area and life, with conventional Earthing Systems

S.No.
Marconite Electrode D 100mm, L 3 m GI pipe D 40 mm, L 3 m GI pipe D 40 mm, L 3 m GI plate L 0.6 m X W 0.6 m
1.
Capital Cost
a
On a/c of Surface area
Surface area of one unit [Electrode]
0.958 sq m 0.380 sq m 0.720 sq m
b
Surface area equal- ant to one unit of Marconite electrode 1 2.52 times 1.33 times
c
On a/c of Life
No of unite required for a life of 50 yrs.
50 yrs / 50 yrs = 1 Electrode 50 yrs / 8 yrs = 6.25 Electrodes 50 yrs / 10 yrs = 5 Electrodes
d
Total no of units required for a life of 50+ yrs [ b*c] One unit 2.52 X 6.25=15.75 or 16 units 1.33 X 5 = 6.65 or 7 Units
e
Cost of one unit with installation Rs 16,500/- each As CPWD DSR 2014
4.5 m Rs 3,926/- or
3.0 m Rs 2,618/-
As CPWD DSR 2014
Rs 4,500/-
f
Capital cost of electrode’s 50 yrs life Rs 16.500/- X 1 = Rs 16,500/- Rs 2,618/- X 16 = Rs 41,888/- Rs 4,500/- X 7 = Rs 31,500/-
2.
Maintenance Cost
Cost of Water, Salt and Labor for one unit. Water or recharge is not required for life.

- Yearly Cost Nil

- Water yrly 6 times :
Rs 10 X 6 = Rs 60/-

- Watering labor yrly:
Rs 50 X 6= Rs 300/-

- Salt yearly with
labor Rs 600/-

- Yearly Cost Rs 960/-

- Cost of life for 1 unit
Rs 960*7 yrs =
Rs 6,720/-

- Cost of life for 16
units Rs 6,720*16
= Rs 1,07,520/-

- Water yrly 6 times :
Rs 60/-

- Watering labor yrly:
Rs 50 X 6 = Rs 300

- Salt yearly with
labor Rs 600/-

- Yearly Cost Rs 960/-

- Cost of life for 1 unit
Rs 960*9 yrs =
Rs 8,640/-

- Cost of life for 7
units Rs 8,640*7
= Rs 86,480/-

3.
Total Capital Cost + Maintenance for 50 yrs Rs 16.500/- (+)
Maintenance Nil
= Rs 16,500/-
Rs 41,888/- (+)
Maint.Rs 1,07,520/-
= Rs 1,49,408/-
Rs 31,500/- (+)
Maint. Rs 8,640/-
= Rs 1,17,980/-

THEORETICAL CALCULATIONS OF PERFORMANCE OF VARIOUS EARTHING SYSTEMS IN DIFFERENT SOIL RESISTIVITY

Soil Resistivity Ω-m

Marconite

d 100 mm X L 3m

Pipe/Rod

d 40 mm, L 3m

Plate

600 mm x 600 mm

Soil Resistivity Ω-m

Marconite

d 100 mm X L 3m

Pipe/Rod

d 40 mm, L 3m

Plate

600 mm x 600 mm

1

0.2

0.3

0.4

550

130.7

157.4

203.1

2

0.5

0.7

0.7

600

142.6

200.9

221.6

3

0.7

1.0

1.1

650

154.4

217.6

240.1

4

1.0

1.3

1.5

700

166.3

234.4

258.5

5

1.2

1.7

1.8

750

178.2

251.1

277.0

6

1.4

2.0

2.2

800

190.1

267.8

295.5

7

1.7

2.3

2.6

850

202.0

284.6

313.9

8

1.9

2.7

3.0

900

213.8

301.3

332.4

9

2.1

3.0

3.3

950

225.7

318.1

350.9

10

2.4

3.3

3.7

1000

237.6

334.8

369.3

15

3.6

5.0

5.5

1100

261.4

368.3

406.3

20

4.8

6.7

7.4

1200

285.1

401.8

443.2

25

5.9

8.4

9.2

1300

308.9

435.2

480.1

30

7.1

10.0

11.1

1400

332.7

468.7

517.1

35

8.3

11.7

12.9

1500

356.4

502.2

554.0

40

9.5

13.4

14.8

1600

380.2

535.7

590.9

45

10.7

15.1

16.6

1700

403.9

569.1

627.9

50

11.9

16.7

18.5

1800

427.7

602.6

664.8

55

13.1

18.4

20.3

1900

451.5

636.1

701.7

60

14.3

20.1

22.2

2000

475.2

669.6

738.7

65

15.4

21.8

24.0

2250

534.6

753.3

831.0

70

16.6

23.4

25.9

2500

594.0

837.0

923.3

75

17.8

25.1

27.7

2750

653.4

920.7

1015.7

80

19.0

26.8

29.5

3000

712.8

1004.4

1108.0

85

20.2

28.5

31.4

3250

772.2

1088.1

1200.3

90

21.4

30.1

33.2

3500

831.6

1171.8

1292.7

95

22.6

31.8

35.1

3750

891.0

1255.5

1385.0

100

23.8

33.5

36.9

4000

950.4

1339.2

1477.3

110

26.1

36.8

40.6

4250

1009.8

1422.9

1569.7

120

28.5

40.2

44.3

4500

1069.2

1506.6

1662.0

130

30.9

43.5

48.0

4750

1128.6

1590.3

1754.3

140

33.3

46.9

51.7

5000

1188.0

1674.0

1846.7

150

35.6

50.2

55.4

5500

1306.9

1841.4

2031.3

160

38.0

53.6

59.1

6000

1425.7

2008.8

2216.0

170

40.4

56.9

62.8

6500

1544.5

2176.1

2400.7

180

42.8

60.3

66.5

7000

1663.3

2343.5

2585.3

190

45.1

63.6

70.2

7500

1782.1

2510.9

2770.0

200

47.5

67.0

73.9

8000

1900.9

2678.3

2954.7

225

53.5

75.3

83.1

8500

2019.7

2845.7

3139.4

250

59.4

83.7

92.3

9000

2138.5

3013.1

3324.0

275

65.3

92.1

101.6

9500

2257.3

3180.5

3508.7

300

71.3

100.4

110.8

10000

2376.1

3347.9

3693.4

325

77.2

108.8

120.0

11000

2613.7

3682.7

4062.7

350

83.2

117.2

129.3

12000

2851.3

4017.5

4432.0

375

89.1

125.5

138.5

13000

3088.9

4352.3

4801.4

400

95.0

133.9

147.7

14000

3326.5

4687.1

5170.7

425

101.0

142.3

157.0

15000

3564.1

5021.9

5540.0

450

106.9

150.7

166.2

16000

3801.8

5356.7

5909.4

475

112.9

159.0

175.4

17000

4039.4

5691.5

6278.7

500

118.8

167.4

184.7

18000

4277.0

6026.3

6648.0