Calculation of Earth Conductor Cross Section
Minimum cross-sections to be applied for copper grounding conductors, copper contact conductors or copper ground continuity conductors that do not form a core or part of the cable forming the relevant circuit conductor.
Largest Relevant Circuit Conductor Section (mm²) | Grounding Conductor Cross Section (mm²) | Earth Continuity Conductor Cross Section (mm²) | Earth Connection Conductor Cross Section (mm²) |
1 | 6 | 1.0* | 1.0*† |
1.5 | 6 | 1.0* | 1.0*† |
2.5 | 6 | 1.0* | 1.0*† |
4 | 6 | 2.5 | 1.0*† |
6 | 6 | 2.5 | 1.0*† |
10 | 6 | 6 | 2.5*† |
16 | 6 | 6 | 2.5*† |
25 | 16 | 16 | 6 |
35 | 16 | 16 | 6 |
50 | 16 | 16 | 6 |
70 | 50 | 50 | 16 |
95 | 50 | 50 | 16 |
120 | 50 | 50 | 16 |
150 | 50 | 50 | 16 |
185 | 70 | 70 | 50 |
240 | 70 | 70 | 50 |
300 | 70 | 70 | 50 |
400 | 70 | 70 | 50 |
500 | 70 | 70 | 50 |
630 | 70 | 70 | 50 |
* In cases where the earth continuity conductor or earth connection conductor is laid outdoors, this conductor will be at least 1.5mm².
† The conductor cross-section shall be at least 6mm² for earth connection of services such as gas, water and other metal parts at the entrance point of the consumer facility.