CONDUCTOR SPECIFICATION In According to IEC 60228

Table A.1 — Class 1 solid conductors for single-core and multicore cables

Nominal cross-sectional area
mm²
Maximum resistance of conductor at 20 °C
Circular, annealed copper conductors Aluminium and aluminium alloy conductor,
circular or shaped
Ω/km
Plain
Ω/km
Metal Coated
Ω/km
0.5 36.0 36.7 -
0.75 24.5 24.8 -
1.0 18.1 18.2 -
1.5 12.1 12.2 -
2.5 7.41 7.56 -
4 4.61 4.70 -
6 3.08 3.11 -
10 1.83 1.84 3.08 a
16 1.15 1.16 1.91 a
25 0.727 - 1.20 a
35 0.524 - 0.868 a
50 0.387 - 0.641
70 0.268 - 0.443
95 0.193 - 0.320 b
120 0.153 - 0.253 b
150 0.124 - 0.206 b
185 0.101 - 0.164 b
240 0.0775 - 0.125 b
300 0.0620 - 0.100 b
400 0.0465 - 0.0778
500 - - 0.0605
630 - - 0.0469
800 - - 0.0367
1000 - - 0.0291
1200 - - 0.0247

a. Aluminium conductor 10 mm² to 35 mm² circular only.

b. For single core cables, four sectoral shaped conductors may be assembled into a single circular conductor. The maximum resistance of the assembled conductor shall be 20 % of that of the individual component conductor.

 

Table A.2 — Class 2 stranded conductors for single-core and multi-core cables

Nominal cross-sectional area
mm²
Minimum number of wires in the conductor Maximum resistance of conductor at 20 °C
Circular Circular compacted Shaped Annealed copper conductor Aluminium or aluminium alloy conductorc
Ω/km
Cu Al Cu Al Cu Al Plain wires
Ω/km
Metal-coated wires
Ω/km
0.5 7 - - - - - 36.0 36.7 -
0.75 7 - - - - - 24.5 24.8 -
1.0 7 - - - - - 18.1 18.2 -
1.5 7 - - - - - 12.1 12.2 -
2.5 7 - - - - - 7.41 7.56 -
4 7 - - - - - 4.61 4.70 -
6 7 - - - - - 3.08 3.11 -
10 7 7 6 6 - - 1.83 1.84 3.08
16 7 7 6 6 - - 1.15 1.16 1.91
25 7 7 6 6 6 6 0.727 0.734 1.20
35 7 7 6 6 6 6 0.524 0.529 0.868
50 19 19 6 6 6 6 0.387 0.391 0.641
70 19 19 12 12 12 12 0.268 0.270 0.443
95 19 19 15 15 15 15 0.193 0.195 0.320
120 37 37 18 15 18 15 0.153 0.154 0.253
150 37 37 18 15 18 15 0.124 0.126 0.206
185 37 37 30 30 30 30 0.0991 0.100 0.164
240 37 37 34 30 34 30 0.0754 0.0762 0.125
300 61 61 34 30 34 30 0.0601 0.0607 0.100
400 61 61 53 53 53 53 0.0470 0.0475 0.0778
500 61 61 53 53 53 53 0.0366 0.0369 0.0605
630 91 91 53 53 53 53 0.0283 0.0286 0.0469
800 91 91 53 53 - - 0.0221 0.0224 0.0367
1000 91 91 53 53 - - 0.0176 0.0177 0.0291
1200
0.0151 0.0151 0.0247
1400a 0.0129 0.0129 0.0212
1600 0.0113 0.0113 0.0186
1800a 0.0101 0.0101 0.0165
2000 0.0090 0.0090 0.0149
2500 0.0072 0.0072 0.0127

a. These sizes are non-preferred. Other non-preferred sizes are recognized for some specialized applications but are not within the scope of IEC 60228.
b. The minimum number of wires for these sizes is not specified. These sizes may be constructed from 4, 5 or 6 equal segments (Milliken).
c. For stranded aluminium alloy conductors having the same nominal cross-sectional area as an aluminium conductor the resistance value should he agreed between the manufacturer and the purchaser.

Table A.3 — Class 5 flexible copper conductors for single-core and multi-core cables

Nominal cross-sectional area
mm
Maximum diameter of wires in conductor
mm
Maximum resistance of conductor at 20°C
Plain wires
Ω/km
Metal-coated wires
Ω/km
0.5 0.21 39.0 40.1
0.75 0.21 26.0 26.7
1.0 0.21 19.5 20.0
1.5 0.26 13.3 13.7
2.5 0.26 7.98 8.21
4 0.31 4.95 5.09
6 0.31 3.30 3.39
10 0.41 1.91 1.95
16 0.41 1.21 1.24
25 0.41 0.780 0.795
35 0.41 0.554 0.565
50 0.41 0.386 0.393
70 0.51 0.272 0.277
95 0.51 0.206 0.210
120 0.51 0.161 0.164
150 0.51 0.129 0.132
185 0.51 0.106 0.108
240 0.51 0.0801 0.0817
300 0.51 0.0641 0.0654
400 0.51 0.0486 0.0495
500 0.61 0.0384 0.0391
630 0.61 0.0287 0.0292

 

Table B.1 - Maximum diameters of circular copper conductors - solid, non-compacted stranded and flexible

Cross-sectional area
mm
Conductor in cables for fixed installations Flexible conductors (Calsses 5 and 6)
mm
Solid (Class 1)
mm
Stranded (Class 2)
mm
0.5 0.9 1.1 1.1
0.75 1.0 1.2 1.3
1.0 1.2 1.4 1.5
1.5 1.5 1.7 1.8
2.5 1.9 2.2 2.4
4 2.4 2.7 3.0
6 2.9 3.3 3.9
10 3.7 4.2 5.1
16 4.6 5.3 6.3
25 5.7 6.6 7.8
35 6.7 7.9 9.2
50 7.8 9.1 11.0
70 9.4 11.0 13.1
95 11.0 12.9 15.1
120 12.4 14.5 17.0
150 13.8 16.2 19.0
185 15.4 18.0 21.0
240 17.6 20.3 24.0
300 19.8 23.1 27.0
400 22.2 26.1 31.0
500 - 29.2 35.0
630 - 33.2 39.0
800 - 37.6 -
1 000 - 42.2 -
NOTE - The values given for flexible conductor are intended to allow for both class 5 and class 6 conductors.

 

Table B.2 — Minimum and maximum diameters of stranded compacted circular copper, aluminium and aluminium alloy conductors

Cross-sectional area
mm²
Conductor in cables for fixed installations
Minimum diameter
mm
Maximum diameter
mm
10 3.6 4.0
16 4.6 5.2
25 5.6 6.5
35 6.6 7.5
50 7.7 8.6
70 9.3 10.2
95 11.0 12.0
120 12.3 13.5
150 13.7 15.0
185 15.3 16.8
240 17.6 19.2
300 19.7 21.6
400 22.3 24.6
500 25.3 27.6
630 28.7 32.5
  • NOTE 1 - The dimensional limits of aluminium conductors with cross-sectional areas above 630 mm² are not given as the compaction technology is not generally established.
  • NOTE 2 - No values are given for compacted copper conductors in the size range 1,5 mm2 to 6 mm².