Earth Testing and Measurements

ERM prides itself on its safety record and the feedback from our clients that safety is evidently second nature and taken very seriously. Key to this is ERM’s dedicated team of field staff that are highly-experienced, having worked on a wide range of earthing systems including substations up to 400kV, renewables, power stations, railways and industrial sites. ERM provides the most comprehensive test packages in the industry, covering all aspects of earthing assessment and helping ensure compliance with required standards.


ERM can offer any of the following services:

  • Earth resistance of impedance tests / fall of potential tests, including AC current injection
  • Soil resistivity measurements (Wenner soundings)
  • Earth electrode tests
  • Earth continuity tests
  • Earthing system inspection and testing (continuity)
  • Joint inspection and testing
  • Fence and gate earthing inspection and test
  • Earthing system continuity and integrity survey
  • Touch, step and transfer voltage measurements
  • Earth conductor location or tracing (electromagnetic and ground penetrating radar techniques)
  • Third-party impact survey
  • Often frequented tower (OFT) survey

Where land access is necessary for field tests, ERM is able to identify and contact land owners as necessary. Environmental protection is taken very seriously so all land access is pedestrian-only.

We can also provide independent audit of newly installed earthing or lightning protection systems, checks against drawings and latest standards / specifications, joint testing, bonding checks and overall earth impedance measurements.

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