Voltage Drop (mV/ A /m)
Voltage Drop (mV/A/m)
| Nominal Area of Conductor |
2 Cables single phase ac (enclosed in conduit or trunking) |
3 or 4 cables, three phase ac (enclosed in conduit or trunking) |
| Sqmm |
Reference method A & B |
Reference method A & B |
| 1 |
|
44 |
|
|
38 |
|
| 1.5 |
|
29 |
|
|
25 |
|
| 2.5 |
|
18 |
|
|
15 |
|
| 4 |
|
11 |
|
|
9.5 |
|
| 6 |
|
7.3 |
|
|
6.4 |
|
| 10 |
|
4.4 |
|
|
3.8 |
|
| 16 |
|
2.8 |
|
|
2.4 |
|
| |
r |
x |
z |
r |
x |
z |
| 25 |
1.80 |
0.33 |
1.80 |
1.50 |
0.29 |
1.55 |
| 35 |
1.30 |
0.31 |
1.30 |
1.10 |
0.27 |
1.10 |
| 50 |
0.95 |
0.30 |
1.00 |
0.81 |
0.26 |
0.85 |
| 70 |
0.65 |
0.29 |
0.72 |
0.56 |
0.25 |
0.61 |
| 95 |
0.49 |
0.28 |
0.56 |
0.42 |
0.24 |
0.48 |
| 120 |
0.39 |
0.27 |
0.47 |
0.33 |
0.23 |
0.41 |
| 150 |
0.31 |
0.27 |
0.41 |
0.27 |
0.23 |
0.36 |
| 185 |
0.25 |
0.27 |
0.37 |
0.22 |
0.23 |
0.32 |
| 240 |
0.195 |
0.26 |
0.33 |
0.17 |
0.23 |
0.29 |
| 300 |
0.160 |
0.26 |
0.31 |
0.14 |
0.23 |
0.27 |
| 400 |
0.130 |
0.26 |
0.29 |
0.12 |
0.22 |
0.25 |
| 500 |
0.110 |
0.26 |
0.28 |
0.10 |
0.22 |
0.25 |
| 630 |
0.094 |
0.25 |
0.27 |
0.08 |
0.22 |
0.24 |
Note: For cables having conductors of 16 mm2 or less cross-sectional area, their inductance can be ignored and (mV/A/m)r, values only are tabulated. For cables having conductor greater than 16 mm2 cross-sectional area the impendence values are given as (mV/A/m)z, together with the resistive component (mV/A/m)r, and the reactive component (mV/A/m)x