Reference Table 5.1 in AS/NZS 3000:2018
| Nominal Size of Active Conductor (mm2) |
Nominal Size of Earth Conductor with 'Cu' Active Conductor (mm2) |
Nominal Size of Earth Conductor with 'Al' Active Conductor (mm2) |
| 1 |
1a |
- |
| 1.5 |
1.5a |
- |
| 2.5 |
2.5 |
- |
| 4 |
2.5 |
- |
| 6 |
2.5 |
- |
| 10 |
4 |
- |
| 16 |
6 |
4 |
| 25 |
6 |
6 |
| 35 |
10 |
6 |
| 50 |
16 |
10 |
| 70 |
25 |
10 |
| 95 |
25 |
16 |
| 120 |
35 |
25 |
| 150 |
50 |
25 |
| 185 |
70 |
35 |
| 240 |
35 |
50 |
| 300 |
120 |
70 |
| 400 |
≥120b |
≥120b |
| 500 |
≥120b |
≥120b |
| 630 |
≥120b |
≥120 |
Special Notes:
a - These earthing conductors shall only be used where incorporated in a multi-core cable or flexible cord, other than a lift travelling cable, in accordance with Clause 5.3.3.4, Items (b) and (c).
b - A larger earthing conductor may be required to satisfy Clause 5.3.3.1.1.
c - Refer Section 5.3.3 in AS/NZS 3000:2018 for more information on earthing conductor size.