Table 4F2B

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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