The following tables based on the information given in the I.E.E regulation 12th Edition 1950 table 21. Approximate sizes of fuse elements composed of tinned copper wires for use in semi enclosed fuses. The figures are an approximate guide only. The current at which the fuse will blow depend upon the construction of the fuse holder in which the wire is used.

S.W.G

Fuse Current
rating amperes

Approximate fusing current

S.W.G

Fuse Current
rating amperes

Approximate fusing current

40

1.5

3

26

14

28

39

2.5

4

25

15

30

38

3

5

232

17

33

37

3.5

6

23

20

38

36

4.5

7

22

24

48

35

5

8

21

29

58

34

5.5

9

20

34

70

33

6

10

19

38

81

32

7

11

18

45

106

31

8

13

17

65

135

30

8.5

13

16

73

166

29

10

16

15

78

197

28

12

18

14

102

230

27

13

23

13

130

295

Capacity of transformers in kVA

H.T Voltage
Rating

Size of TC Fuse
wire in SWG

Horn gap length in mm (inches)

5000

-

2 x 20

385 (15)

3000/3150

-

20

-

1500/1600

-

21

-

1000

-

22

-

750

-

23

-

500

-

26

-

500

11 KV

20

205 (8)

250

-

23

-

100

-

33

-

75

-

33

-

63

-

33

-

50

-

33

-

25

-

28

-

READY RECKONER FOR MONTHLY CONSUMPTION AT : HOUR USAGE PER DAY

(1000 watts used for 1 hr = 1 kwh = 1 unit)

Type of appliances

Wattage

Units
/Months

Type of appliances    

Wattage

Units /Month

Lamp

100

3

Mixer Big

200

6.0

Ceiling Fan 48"

50

1.5

Air Conditioner 1 Ton 1.8 KW

1800

54.0

Table fan 16*, 14*, 12*

40

1.2

Refrigerator Small 1/4 HP

200

6.0

Electric Iron

550

16.5

Washing machine

200

6.0

Dhobi Iron

1000

30

Cloth Driver/spin drier

200

6.0

Geyser

2000

60

TV

150

4.5

immersion Rod

1000

30

Oven 2 plates 3 KW

3000

90.0

Stove

1000

30

Cooking Ranges 5 KW

5000

150.0

Cooker

1500

45

Tape Recorder

50

1.5

Toaster

100

3