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    IEC Standard Caledonian Offshore & Marine Cables Technical Information

    Power Copper Conductors According to IEC 60228

    Tinned conductors

    Cross section cl.2 cl.5 Cross section cl.2 cl.5
    mm² Ohm/km Ohm/km mm² Ohm/km Ohm/km
    1.0 18.2 20 70 0.270 0.277
    1.5 12.2 13.7 95 0.195 0.210
    2.5 7.56 8.21 120 0.154 0.164
    4 4.70 5.09 150 0.126 0.132
    6 3.11 3.39 185 0.100 0.108
    10 1.84 1.95 240 0.0762 0.0817
    16 1.16 1.24 300 0.0607 0.0654
    25 0.734 0.795 400 0.0475 0.0495
    35 0.529 0.565 500 0.0369 0.0391
    50 0.391 0.393 630 0.0286 0.0292

    Plain conductors

    Cross section cl.2 cl.5 Cross section cl.2 cl.5
    mm² Ohm/km Ohm/km mm² Ohm/km Ohm/km
    1 18.1 19.5 70 0.268 0.272
    1.5 12.1 13.3 95 0.193 0.206
    2.5 7.41 7.98 120 0.153 0.161
    4 4.61 4.95 150 0.124 0.129
    6 3.08 3.30 185 0.0991 0.106
    10 1.83 1.91 240 0.0754 0.0801
    16 1.15 1.21 300 0.0601 0.0641
    25 0.727 0.780 400 0.0470 0.0486
    35 0.524 0.554 500 0.0366 0.0384
    50 0.387 0.386 630 0.0283 0.0287

    Correction factors according to IEC 60228

    IEC 60228 standard provides electrical resistance of copper conductors at an ambient temperature of 20°C.

    For other temperatures, correction factors are applied as below :

    Temperature (°C) Kt
    5 1.064
    10 1.042
    15 1.020
    20 1.000
    25 0.980
    30 0.962
    35 0.943
    40 0.926
    45 0.909
    50 0.893
    55 0.877
    60 0.862
    65 0.847
    70 0.833
    75 0.820
    80 0.806
    85 0.794
    90 0.781
    95 0.769
    100 0.758

    Instrumentation & Control Conductors According to IEC 60092-376

      Tinned conductors Plain conductors
    Cross section cl.2 cl.5 cl.2 cl.5
    mm² Ohm/km Ohm/km Ohm/km Ohm/km
    0.5 41.6 42.5 40.4 41.4
    0.75 26.3 28.3 26.0 27.6
    1 19.3 21.2 19.2 20.7
    1.5 12.9 145. 12.8 14.1
    2.5 8.02 8.71 7.56 8.47

    Current Ratings for Continuous Service (IEC 60092-352)

    Conductor temperature 90℃
    Nominal cross-sectional Area Single core Two core Three core & four core
    mm² A A A
    0.5 10 8.5 7
    0.75 13 11 9
    1 18 15 13
    1.5 23 20 16
    2.5 30 26 21
    4 40 34 28
    6 52 44 36
    10 72 61 50
    16 96 82 67
    25 127 108 89
    35 157 133 110
    50 196 167 137
    70 242 206 169
    95 293 249 205
    120 339 288 237
    150 389 331 273
    185 444 377 311
    240 522 444 366
    300 601 511 420
      d.c. a.c. d.c. a.c. d.c. a.c.
    400 690 670 587 570 483 469
    500 780 720 663 612 546 504
    500 890 780 757 663 623 546

    Note

    1. Maximum permissible service temperature of the conductor is 90℃.

    2. The current ratings given above are based on an ambient air temperature of 45℃.

    3. The current ratings given above are for 6 cables of less bunched or laid together in flat formation. When more than 6 cables are bunched or laid close together, the current ratings given above should be multiplied by correction factor 0.85.

    4. For cables with more than four core cables, the current ratings are calculated by the following formula :

    I1 : Current for single core cable

    N : Number of cores

    5. Correction factors for various ambient air temperature

    Maximum conductor temperature Correction factors for ambient air temperature
    35 40 45 50 55 60 65 70 75 80
    90 1.10 1.05 1.00 0.94 0.88 0.82 0.74 0.67 0.58 0.47

    Short Circuit Current Ratings

    The short circuit currents quoted here are for cables operating normally at maximum conductor temperature of 90℃.

    XLPE insulation is actually capable of withstanding short-term temperature up to 250℃.

    According to ICEA P-32-382 Curves based on formula :

    I : Short circuit current (kA)

    A : Conductor area (mm²)

    T1 : Operating temperature (85℃)

    T2 : Short circuit temperature (250℃)

    t : Short circuit duration (sec)

    T1 = 90, T2 = 250

    Nominal Area Short Circuit Current(kA)
    Duration of Short Circuit in Second
    (mm²) 0.03 0.05 0.07 0.1 0.14 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
    1.5 1.26 0.98 0.83 0.69 0.58 0.49 0.40 0.35 0.31 0.28 0.26 0.24 0.23 0.22
    2.5 2.02 1.56 1.32 1.10 0.93 0.78 0.64 0.55 0.49 0.45 0.42 0.39 0.37 0.35
    4 3.25 2.52 2.13 1.78 1.50 1.26 1.03 0.89 0.80 0.73 0.67 0.63 0.59 0.56
    6 4.86 3.77 3.18 2.66 2.25 1.88 1.54 1.33 1.19 1.09 1.01 0.94 0.89 0.84
    10 8.19 6.34 5.36 4.49 3.79 3.17 2.59 2.24 2.01 1.83 1.70 1.59 1.50 1.42
    16 12.99 10.06 8.50 7.11 6.01 5.03 4.11 3.56 3.18 2.90 2.69 2.52 2.37 2.25
    25 20.6 15.9 13.5 11.3 9.5 8.0 6.5 5.6 5.0 4.6 4.3 4.0 3.8 3.6
    35 28.5 22.1 18.7 15.6 13.2 11.1 9.0 7.8 7.0 6.4 5.9 5.5 5.2 4.9
    50 38.6 29.9 25.3 21.2 17.9 15.0 12.2 10.6 9.5 8.6 8.0 7.5 7.1 6.7
    70 55.9 43.3 36.6 30.6 25.9 21.6 17.7 15.3 13.7 12.5 11.6 10.8 10.2 9.7
    95 77.5 60.0 50.7 42.4 35.9 30.0 24.5 21.2 19.0 17.3 16.0 15.0 14.1 13.4
    120 97.9 75.8 64.1 53.6 45.3 37.9 31.0 26.8 24.0 21.9 20.3 19.0 17.9 17.0
    150 120.3 93.1 78.7 65.9 55.7 46.6 38.0 32.9 29.5 26.9 24.9 23.3 22.0 20.8
    185 150.8 116.8 98.8 82.6 69.8 58.4 47.7 41.3 36.9 33.7 31.2 29.2 27.5 26.1
    240 198.3 153.6 129.8 108.6 91.8 76.8 62.7 54.3 48.6 44.3 41.0 38.4 36.2 34.3
    300 248.7 192.6 162.8 136.2 115.1 96.3 78.6 68.1 60.9 55.6 51.5 48.2 45.4 43.1
    400 329.3 255.1 215.6 180.4 152.5 127.6 104.1 90.2 80.7 73.6 68.2 63.8 60.1 57.0
    500 401.0 310.6 262.5 219.6 185.6 155.3 126.8 109.8 98.2 89.7 83.0 77.7 73.2 69.5

    Reactance / Impedance

    Reactance

    Conductor area mm² 1.5 2.5 4 6 10 25 35 50 70 95 120 150 185 240 300
    Rating factors Ω /km 0.135 0.125 0.117 0.111 0.103 0.098 0.097 0.094 0.091 0.090 0.088 0.088 0.088 0.088 0.087

    The reactance of a cable operating in AC system depends on many factors, including, in particular, the axial spacing between conductors and proximity and magnetic properties of adjacent steelwork. The formar is known for multicore cable, but may vary for single core cables depending upon the spacing between them and their disposition when installed.

    Reactances of cables in certain dispositions remote from steelwork are calculable and are shown. The tabulated values are for cables with circular conductors. The value for a sector- shaped conductor should be taken as 90% of the tabulated value. The value of reactance so calculated is for a supply frequency of 60Hz. For any other frequency, a correction should be made in direct proportion to the frequency.

    For example at 50Hz, the reactance is 0.83 times that at 60Hz. Induction for 2-and 3- conductor cables is given by the formula :

    L = Inductance in H/m and phase

    a = Axial space between conductor

    d = Conductor diameter in mm

    Reactance for 2- and 3- conductor cables is given by the formula :

    X = Reactance in ohm per phase

    F = Frequency in Hz

    L = Inductance in H/m and phase

    I = Conductor Iength in meter

    Impedance

    Conductor area mm² 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240 300
    Rating factors Ω/km 15.557 9.641 5.994 3.967 2.348 1.482 0.941 0.681 0.507 0.356 0.265 0.215 0.183 0.155 0.131 0.116

    Impedance for 2, 3 & 4 conductor cables is given by the formula :

    Z = Impedance in ohm per phase

    R = Resistance at operating temp. in ohm per phase

    X = Reactance in ohm per phase

    Voltage Drop (Cables Up to 1 KV)

    Nominal c.s.a mm² K
    3x1 cores (trefoil formation) 2 cores 3-4 cores
    C.d.T. c.a. cosfi 1 mV/Am C.d.T. c.a. cosfi 0.8 mV/Am C.d.T. c.a. cosfi 1 mV/Am C.d.T. c.a. cosfi 0.8 mV/Am C.d.T. c.a. cosfi 1 mV/Am C.d.T. c.a. cosfi 0.8 mV/Am
    1     46.4 37.3 40.1 32.3
    1.5     31.1 25.0 26.9 21.7
    2.5     19.3 15.6 16.7 13.5
    4     12.0 9.73 10.4 8.41
    6     7.93 6.48 6.860 5.60
    10 3.51 2.90 4.69 3.88 4.059 3.35
    16 2.21 1.86 2.96 2.48 2.559 2.15
    25 1.40 1.21 1.87 1.61 1.620 1.39
    35 1.01 0.891 1.35 1.19 1.168 1.03
    50 0.747 0.681 0.998 0.910 0.864 0.787
    70 0.517 0.494 0.690 0.660 0.597 0.571
    95 0.374 0.379 0.500 0.507 0.432 0.439
    120 0.296 0.316 0.396 0.422 0.343 0.365
    150 0.244     0.273 0.282 0.316
    185 0.195     0.234 0.225 0.271
    240 0.151     0.198 0.174 0.229
    300 0.122     0.175 0.142 0.203

    Voltage Drop Coefficient

    The voltage drop coefficients in each circuit are given in the following table :

    Voltage Conductor size Voltage drop coefficient
      mm² 100 95 90 85 80 75 70
    250V 0.75 1.00 0.95 0.90 0.85 0.80 0.75 0.70
    1 1.00 0.95 0.90 0.85 0.80 0.75 0.70
    0.6/1KV 1.5 1.00 0.95 0.90 0.85 0.80 0.75 0.71
    2.5 1.00 0.95 0.90 0.86 0.81 0.76 0.71
    4 1.00 0.96 0.91 0.86 0.81 0.76 0.71
    6 1.00 0.96 0.91 0.86 0.81 0.77 0.72
    10 1.00 0.96 0.92 0.87 0.82 0.77 0.73
    16 1.00 0.97 0.92 0.88 0.83 0.76 0.74
    25 1.00 0.98 0.94 0.90 0.85 0.81 0.76
    35 1.00 0.99 0.95 0.91 0.87 0.83 0.78
    50 1.00 1.00 0.97 0.93 0.89 0.85 0.81
    70 1.00 1.02 1.00 0.97 0.93 0.90 0.86
    95 1.00 1.04 1.03 1.01 0.98 0.95 0.92
    120 1.00 1.07 1.06 1.05 1.03 1.00 0.97
    150 1.00 1.09 1.10 1.09 1.08 1.05 1.03
    185 1.00 1.13 1.15 1.15 1.15 1.13 1.11
    240 1.00 1.19 1.23 1.25 1.25 1.25 1.24
    300 1.00 1.24 1.31 1.35 1.36 1.37 1.37
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