Electromagnetic field assessment

Many of us who live near a low voltage (0.4 kV) or medium voltage (20 kV) overhead or cable line, or those whose house is located beside a transformer substation or distribution box is interested: is it safe to live there? Do we have health risk to live there?

In 2017, Sadales tīkls organised electromagnetic radiation measurements  (electric and magnetic fields) at the distribution electrical installations in order to assess their compliance with European Council Recommendation 1999/519/EC of 12 July 1999 on the limitation of exposure of the general public to electromagnetic fields (0 Hz to 300 GHz). The results of the measurements show that the values ​​of the electromagnetic field near Sadales tīkls electrical installations do not exceed the established limitations ​​and do not result in harmful effects on human health.


Electromagnetic field assessment

Object Permissible magnetic field threshold value (µT*)  Maximum magnetic field value measured (µT*) Permissible electric field threshold value (V/m)** Maximum electric field value measured (V/m)**
20 kV insulated wire power line 100 0,155 5000 110
20 kV bare-wire power line 0,262 85
20/0,42 kV distribution transformer substation with an oil transformer  19,62 24
20/0,42 kV distribution transformer substation with a dry-type transformer  9,12 12
 Multi-apartment 0.4 kV electricity metering switchgear 11,30 8


* Magnetic field induction is measured in microteslas (µT)

** Electric field strength is measured in kilovolts per metre (kV/m)

On 1st November 2018, Regulations on Assessment and Limitation of the Effects of Electromagnetic Field on the Population entered into force in Latvia.