Distance for field to fall to various values
The usual way of expressing the field from a power line is to show
how the field falls with distance. We give lots of examples here.
Sometimes it is more helpful to express the distance for the field
to fall to a certain value of field. This table presents this information.
| Voltage |
Distance (m) for typical field
to fall to: |
| 10 µT |
1 µT |
0.4 µT |
0.1 µT |
0.01 µT |
| 400/275 kV |
* |
30-40 |
50-60 |
90-110 |
200+ |
| 132 kV |
* |
0-10 |
10-30 |
30-60 |
90+ |
| 33/11 kV |
* |
0-5 |
0-20 |
10-40 |
50+ |
| 400 V |
* |
* |
* |
10 |
20+ |
* typical fields from this line do not reach this value anywhere
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