Power line magnetic fields, in milligauss and plain terms
179.00 £
Published date: 2026/11/15
- Location: B3k 5l2, Assam, India
Anything carrying 60 Hz alternating current makes a low-frequency magnetic field around it. That covers the big transmission lines along the highway, the line on your street, the wiring in your walls and most appliances. In the US these fields are measured in milligauss. Almost everywhere else it's microtesla. One microtesla is 10 milligauss, which helps when you're reading a European study.Typical levels in homes are low. In a survey of 992 US homes, the average reading room by room, away from appliances, was under 1 milligauss. Right beside a large transmission line at average load the field is in the tens of milligauss, and it falls off quickly as you walk away from the line.Inside a house, the surprises usually come from wiring, not from the line outside. Current flowing on a water pipe, or a circuit whose outgoing and returning currents don't cancel, can raise the Field at the Fence across a whole room. A licensed electrician can track that down.
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