Jordmotståndet
Jordmotståndet, or earth resistance, is the electrical resistance between a point on a grounding system and the surrounding soil. It is a property of the soil and the grounding arrangement and is central to the performance of protective grounding in electrical installations.
The value of jordmotståndet affects safety: lower resistance enables fault currents to flow quickly, enabling protective
Measurement and methods: It is measured in ohms. Common methods include the fall-of-potential (three-point) method and
Influencing factors: Soil resistivity, moisture content, temperature, salinity, and depth of grounding electrodes strongly affect jordmotståndet.
Standards and practical considerations: National and international standards guide measurement methods and target values for protective