Substations

Small electricity distribution substations, one of which typically serves every few hundred homes, generally produce a magnetic field of up to 2 microteslas (µT) close to their perimeter fences, and often no electric field at all. The fields fall rapidly with distance, and a few metres away from a typical sub-station, the fields associated with it are usually indistinguishable from other fields present in homes. Larger electricity transmission sub-stations do not produce very large fields themselves (generally less than a microtesla); the fields close by are mainly produced by power lines entering them.

back