線size點計

求線 size 需要對照表，要計線既電流，電壓降等，附上對照表








Table 4.6 - Current ratings and volt drops for unsheathed single core p.v.c. insulated cables


Cross sectional area

In conduit in thermal insulation

In conduit in thermal insulation

In conduit on wall

In conduit on wall

Clipped direct

Clipped direct

Volt drop

Volt drop


(mm²)

(A)

(A)

(A)

(A)

(A)

(A)

(mV/A/m)

(mV/A/m)


-

2 cables

3 or 4 cables

2 cables

3 or 4 cables

2 cables

3 or 4 cables

2 cables

3 or 4 cables


1.0

11.0

10.5

13.5

12.0

15.5

14.0

44.0

38.0


1.5

14.5

13.5

17.5

15.5

20.0

18.0

29.0

25.0


2.5

19.5

18.0

24.0

21.0

27.0

25.0

18..0

15.0


4.0

26.0

24.0

32.0

28.0

37.0

33.0

11.0

9.5


6.0

34.0

31.0

41.0

36.0

47.0

43.0

7.3

6.4


10.0

46.0

42.0

57.0

50.0

65.0

59.0

4.4

3.8


16.0

61.0

56.0

76.0

68.0

87.0

79.0

2.8

2.4









Table 4.7 - Current ratings and volt drops for sheathed multi-core p.v.c.-insulated cables


Cross sectional area

In conduit in thermal insulation

In conduit in thermal insulation

In conduit on wall

In conduit on wall

Clipped direct

Clipped direct

Volt drop

Volt drop


(mm²)

(A)

(A)

(A)

(A)

(A)

(A)

(mV/A/m)

(mV/A/m)


-

2 core

3 or 4 core

2 core

3 or 4 core

2 core

3 or 4 core

2 core

3 or 4 core


1.0

11.0

10.0

13.0

11.5

15.0

13.5

44.0

38.0


1.5

14.0

13.0

16.5

15.0

19.5

17.5

29.0

25.0


2.5

18.5

17.5

23.0

20.0

27.0

24.0

18.0

15.0


4.0

25.0

23.0

30.0

27.0

36.0

32.0

11.0

9.5


6.0

32.0

29.0

38.0

34.0

46.0

41.0

7.3

6.4


10.0

43.0

39.0

52.0

46.0

63.0

57.0

4.4

3.8


16.0

57.0

52.0

69.0

62.0

85.0

76.0

2.8

2.4








Table 5.3 - Maximum impedance of circuit protective
----------------- conductors to allow 5 s disconnection time
----------------- for socket outlets


-

Maximum impedance of circuit protective conductor


Rating (A)


Fuse BS 88


Fuse BS 1361

Fuse BS 3036

MCB type 1


MCB type 2


MCB type 3 & C

MCB type B


MCB type D



5

-

3.25

3.25

2.50

1.43

1.00

-

0.50


6

2.48

-

-

2.08

1.19

0.83

1.67

0.42


10

1.48

-

-

1.25

0.71

0.50

1.00

0.25


15

-

0.96

0.96

0.83

0.48

0.33

-

-


16

0.83

-

-

0.78

0.45

0.31

0.63

0.16


20

0.55

0.55

0.63

0.63

0.36

0.25

0.50

0.12


25

0.43

-

-

-

-

-

-

0.10


30

-

0.36

0.43

0.42

0.24

0.17

-

-


32

0.34

-

-

0.39

0.22

0.16

0.31

0.08


40

0.26

-

-

0.31

0.18

0.13

0.25

0.06


45

-

0.18

0.24

0.28

0.16

0.11

0.22

0.06
Extracted from The Electricians Guide Fifth Edition


以上既對照表希望對你有用
如果再有問題，電郵比我

容易啦，1mm = 10A，1.5mm = 15A，2.5mm = 25A，