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Earth resistance small enough?

Only the correct earthing of HV and LV systems ensures that the maximum permissible touch and step voltages are observed.

Earth measurement for the safe operation of power systems

The effectiveness of earthing is central to ensuring the safety of people, animals and technical equipment. Sufficiently small earthing resistances are verified both during the construction of electrotechnical systems and during recurring control measurements.

We are aware of the importance of a good earth connection and are happy to support our customers in achieving the optimal implementation.

Regular measurements in the name of safety

The earth measurement must be carried out for newly constructed or modified earthing systems. In addition, verification of the values for medium and low-voltage systems must be repeated every 5 to 10 years during the usual maintenance intervals. Depending on the nature of the local soil and the size of the system, the intervals may vary.

The earth measurement is carried out in accordance with the applicable guidelines as per the High Current Ordinance. The aim of the measurement is to check a certain earth resistance or earth impedance. Special measuring instruments are used to determine and record whether the earth impedance is sufficiently small. This procedure ensures that protective earths and operational earths comply with the values required by the standards.

Earth measurements are carried out on both low-voltage networks and transformer stations, provided that low-voltage and high-voltage have a common operating earth.

Our specialists carry out the measurements at your premises with modern and calibrated equipment. Afterwards, we discuss the results and eliminate any defects or renovate the system. Often, earthing resistances can be improved with minor measures such as setting deep earth electrodes.


Markus Keusch
Project Manager 
+41 79 681 63 64


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