Voltage Drop at maximum conductor operating temperature in V/A/KM
| Conductor Size |
1 Core unarmoured cables
|
1 Core Armoured (Trefoil) |
2 Core Unarmoured & Armoured
|
3 & 4 Un- armoured
& Armoured
|
| Sq. mm |
1 Ph(A) |
3 Ph(B) |
1 Ph(C) |
3 Ph(D) |
3 Ph |
1 Ph |
3 Ph |
| 1.5 |
31 |
27 |
31 |
27 |
27 |
31 |
27 |
| 2.5 |
19 |
16 |
19 |
16 |
16 |
19 |
16 |
| 4 |
12 |
10 |
12 |
10 |
10 |
12 |
10 |
| 6 |
7.9 |
6.8 |
7.9 |
6.8 |
6.8 |
7.9 |
6.8 |
| 10 |
4.7 |
4.0 |
4.7 |
4.0 |
4 |
4.7 |
4.0 |
| 16 |
2.9 |
2.5 |
2.9 |
2.5 |
2.5 |
2.9 |
2.5 |
| 25 |
1.90 |
1.65 |
1.85 |
1.60 |
1.60 |
1.90 |
1.65 |
| 35 |
1.35 |
1.15 |
1.35 |
1.15 |
1.15 |
1.35 |
1.15 |
| 50 |
1.05 |
0.90 |
1.00 |
0.87 |
0.87 |
1.00 |
0.87 |
| 70 |
0.75 |
0.65 |
0.71 |
0.61 |
0.62 |
0.69 |
0.6 |
| 95 |
0.58 |
0.50 |
0.52 |
0.45 |
0.47 |
0.52 |
0.45 |
| 120 |
0.48 |
0.42 |
0.43 |
0.37 |
0.39 |
0.42 |
0.37 |
| 150 |
0.43 |
0.37 |
0.36 |
0.31 |
0.33 |
0.35 |
0.30 |
| 185 |
0.37 |
0.32 |
0.307 |
0.26 |
0.28 |
0.29 |
0.26 |
| 240 |
0.33 |
0.29 |
0.25 |
0.22 |
0.24 |
0.24 |
0.21 |
| 300 |
0.31 |
0.27 |
0.22 |
0.195 |
0.21 |
0.21 |
0.185 |
| 400 |
0.29 |
0.25 |
0.20 |
0.175 |
0.20 |
0.190 |
0.165 |
| 500 |
0.28 |
0.24 |
0.185 |
0.160 |
0.18 |
- |
- |
| 630 |
0.27 |
0.23 |
0.175 |
0.150 |
0.17 |
- |
- |
A -----> 2 cables, enclosed in Conduit or trunking
B -----> 3 or 4 cables , enclosed in Conduit or trunking.
C -----> 2 cables, clipped direct, on tray or in free air (Cable Touching)
D -----> 3 or 4 cables, clipped direct, on tray or in free air (Cable Touching, trefoil)