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Conductor Formation
 

The Conductor Formation table below lists the construction
recommendations for stranded conductors of single core and
multi core cable along with the maximum permissible D.C. resistance
This table complies with IEC 228 and BS 6360

Nominal
Cross
Sectional
Areas
CIRCULAR
CONDUCTORS

No. & Nominal
Diameters
of Wires
SHAPED OR CIRCULAR
COMPACTED
CONDUCTORS

Minimum Number
or Wires 
MAXIMUM
RESISTANCE
AT 20OC
ohm / km
FLEXIBLE
CONDUCTORS

Max. Dia of
wire in
Conductor

Max. D.C.
Resistance at
20OC ohm / km

mm2

mm

        Cu

 Al

      Cu  

Al

   (mm)Cu  

ohm / km

1 (s)
1.5 (s)
2.5 (s)

4
6
10

16
25
35

50
70
95

120
150
185

240
300
400

500
630
800

1000
1/1.13
1/1.38
1/1.77

7/0.85
7/1.04
7/1.35

7/1.70
7/2.14
7/2.52

19/1.78
19/2.14
19/2.52

37/2.03
37/2.25
37/2.52

61/2.25
61/2.52
61/2.85

61/3.20
127/2.52
127/2.85

127/3.20
-
-
-
-
-
-

6
6
6

6
12
15

18
18
30

34
34
53

53
53
-

-
-
-
-
-
-
-

6
6
6

6
12
15

15
15
30

30
30
53

53
53
-

-
18.1
12.1
7.41

4.61
3.08
1.83

1.15
0.727
0.524

0.387
0.268
0.193

0.153
0.124
0.0991

0.0754
0.0601
0.0470

0.0366
0.0268
0.0221

0.0176
-
-
-

7.41
4.61
3.08

1.91
1.20
0.868

0.641
0.443
0.320

0.253
0.206
0.164

0.125
0.100
0.0778

0.0605
0.0469
0.0367

0.0291

0.21
0.26
0.26

0.31
0.31
0.41

0.41
0.41
0.41

0.41
0.51
0.51

0.51
0.51
0.51

0.51
0.51
0.51

0.61
0.61
-

-

19.5
13.3
7.98

4.95
3.30
1.91

1.21
0.780
0.554

0.386
0.272
0.206

0.161
0.129
0.106

0.0801
0.0641
-

-
-
-

-


 

 

 


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