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Table 4F2B | Voltage Drop (per ampere per metre): Conductor Operating Temperature: 90°C

    Voltage Drop (per ampere per metre):

    Conductor Operating Temperature: 90°C
    Conductor
    cross-sectional
    area    		 1 two-core or 2 single-core cables
    d.c.    		 Two-core cable, single-phase a.c. 1 three-core,
    four-core or
    five-core cable, three-phase a.c.    		 2 single-core cables touching
    Single-phase a.c.*
    1 2 3 4 6
    (mm2) (mV/A/m) (mV/A/m) (mV/A/m) (mV/A/m)
    4 13.2 13.2 11.1 –
    6 8.5 8.5 7.4 –
    10 5.1 5.1 4.4 –
    16 3.2 3.2 2.7 –


    		r x z r x z r x z
    25 2.03 2.03 0.175 2.04 1.73 0.15 1.73 – – –
    35 1.42 – – – 1.22 0.15 1.23 1.44 0.21 1.46
    50 1.00 – – – 0.91 0.145 0.93 1.00 0.21 1.02
    70 0.71 – – – 0.62 0.14 0.64 0.71 0.20 0.73
    95 0.54 – – – 0.47 0.135 0.49 0.54 0.195 0.57
    120 0.42 – – – 0.37 0.135 0.39 0.42 0.190 0.46
    150 0.34 – – – 0.29 0.130 0.32 0.34 0.190 0.39
    185 0.27 – – – 0.24 0.130 0.27 0.27 0.190 0.33
    240 0.21 – – – 0.188 0.130 0.23 0.21 0.185 0.28
    300 0.167 – – – 0.147 0.125 0.195 0.173 0.180 0.25
    400 0.127 – – – – – – 0.132 0.175 0.22
    500 0.100 – – – – – – 0.107 0.170 0.20
    630 0.074 – – – – – – 0.085 0.170 0.190

    Notes:

    1. The voltage drop figures given above are based on a conductor operating temperature of 90°C and are therefore not accurate when the operating temperature is in excess of 90°C. In the case of the 180°C cables with a conductor temperature of 150°C the above resistive values should be increased by a factor of 1.2.
    2. *A larger voltage drop will result if the cables are spaced.

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