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Understanding of wires and cables flexibility.

 - What’s a wire flexibility class?

Electric conductor – the main element of a cable or wire structure. Electric current passes exactly through the electric conductor , transmitting electrical energy from a source to a consumer.

Electric conductor comes in two basic varieties: solid and stranded wire.

Stranded wire is more flexible than solid wire of the same total cross-sectional area.

- How to define the class of wire flexibility?

Based on the flexibility, depending on how many wires are in the core, there is a classification of wires into 6 classes of flexibility. As the wire class increases, the flexibility of a cable product based on it increases respectively. The higher the flexibility class, the more flexible cable products.

According to the standard there are 6 classes of electric conductor flexibility:

Wire flexibility class

Wire cross-section  (mm2)

2,5

4

6

10

16

25

35

50

70

95

120

150

185

240

 

Class 1

Copper/ aluminum wire


Nominal diameter

 (mm)

1,8

2,3

2,8

3,6

4,5

5,7

6,6

8

9,42

11

12,3

13,7

15,2

17,3

Number of cords in a wire

1

1

1

1

1

1

1

1

1

1

1

1

1 (35)

1 (35)

 

Class 2

Copper/ aluminum wire

Nominal diameter

 (mm)

2

2,6

3,1

4,1

5,1

6,4

7,56

8,9

10,7

12,6

14,2

15,8

17,64

20,25

Number of cords in a wire

7

7

7

7

7

6

6

6

12

15

18

18

30

30

 

Class 3

Copper wire

Nominal diameter

 (mm)

2,1

2,6

3,2

4

5,2

6,8

7,65

9,41

10,7

12,5

14,4

16

17,6

-

Number of cords in a wire

7

7

19

19

19

19

19

27

37

37

61

61

91

-

 

Class 4

Copper wire

Nominal diameter

 (mm)

212

2,7

3,2

4,5

5,8

7,2

8,89

11,5

10,2

14,8

17

18,7

22,61

24,03

Number of cords in a wire

20

20

30

49

49

49

98

144

189

189

266

266

330

420

 

Class 5

Copper wire

Nominal diameter

 (mm)

2,1

3

3,7

5,3

6

7,8

9,04

10,8

12,8

14,5

16,8

19,7

21,53

23,45

Number of cords in a wire 

50

56

84

80

224

196

189

266

266

361

608

756

925

1221

 

Class 6

Copper wire

Nominal diameter

 (mm)

2,4

3,1

3,7

5,1

6,2

788

9,84

11,4

12,9

14,7

17,1

18,9

20,37

23,72

Number of cords in a wire

140

228

189

324

513

783

1107

402

999

1332

1702

2109

2590

3360


Visual demonstration of the flexibility classification:

Wires of classes 1 and 2 are intended for cable products of fixed installation. Wires of classes 3, 4, 5 and 6 are designed for flexible cable products, but they can also be used for cable products of fixed installation.