# Why is the reading high with everything switched off?

> Electric fields exist whenever wiring is energised, so unplug at the socket or fit a demand switch. A magnetic field that stays high everywhere indicates a net-current wiring fault.

- Canonical URL: https://emfbase.com/questions/why-do-i-get-a-high-reading-with-everything-switched-off
- Collection: Direct answers
- Record id: `questions:why-do-i-get-a-high-reading-with-everything-switched-off`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/questions/why-do-i-get-a-high-reading-with-everything-switched-off
- Also known as: high EMF reading everything off, body voltage high with power off

## Key values

- **Topic:** measurement

## Question

Why does my meter still read high when everything is switched off?

## Answer

For an electric-field or body-voltage reading, this is expected: the field exists whenever a conductor is energised, regardless of whether current flows, so wiring in the wall behind the bed and a switched-off-but-plugged-in lamp both still produce it. Unplugging at the socket, or fitting a demand switch on the circuit, removes it — switching off at the appliance does not. If it is a magnetic-field reading that stays elevated everywhere and does not fall off with distance, suspect net current from a shared or crossed neutral, which is a wiring fault for an electrician rather than an EMF mitigation problem.

## Related records

- [Bedroom wiring AC electric field](https://emfbase.com/emitters/bedroom-wiring-electric-field): Live conductors in walls and in lamp flex create a power-frequency electric field that couples to the body whether or not any current flows; building biology grades below 1 V/m with ground reference as 'no anomaly'.
- [Net current (wiring error)](https://emfbase.com/glossary/net-current): When the current flowing out on a circuit does not return on the same cable, the imbalance radiates a magnetic field across the whole building.
- [Demand switch (Netzfreischalter)](https://emfbase.com/shielding/demand-switch): A relay in the consumer unit that de-energises a circuit when no load is drawing current and re-energises it when a switch is thrown, eliminating the bedroom AC electric field overnight.

## Sources

- `sbm-2024` Institut für Baubiologie + Nachhaltigkeit (IBN) (2024). *Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024)*. https://buildingbiology.com/site/downloads/SBM-2024_EVALUATION_GUIDELINES_EN.pdf — ngo, link checked 2026-08-12
- `niehs-emf` National Institute of Environmental Health Sciences. *Electric and Magnetic Fields*. https://www.niehs.nih.gov/health/topics/agents/emf — government, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.