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Power Quality >     Ground Audits    

Ground Audits

Electromation Uses State Of The Art Testing Equipment To Perform Reliable Ground Audits For Your Facility.

Ground Testing

  • Ground Verification of:
    • Individual Machines Within a Facility
    • Main Grounding Electrode
    • Grounding Grid
    • Total Effective Ground

  • Testing Methods
    • Stakeless (Ground Loop Resistance)
    • 2-Point (Ground Impedance)
    • 3-Point (Fall-of-Potential)
    • 3-Point (Selective Testing)
    • 4-Point (Soil Resistivity)

Recommended Tests For A Complete Ground Audit

  • Stakeless Measurement
    • First, perform a Stakeless measurement on:
      • The individual legs of the tower and the four corners of the building (cell sites/towers)
      • All grounding connections (electrical substations)
      • The lines running to the remote site (remote switching)
      • The ground stakes of the building (lightning protection)

    • For all applications, this is not a true ground resistance measurement because of the network ground. This is mainly a continuity test to verify that the site is grounded, that we have an electrical connection, and that the system can pass current.

  • 3-Pole Fall-Of-Potential Measurement
    • Second, we measure the resistance of the entire system via the 3-pole Fall-of-Potential method. Keep in mind the rules for stake setting. This measurement should be recorded and measurements should take place at least twice per year. This measurement is the resistance value for the entire site.

  • Selective Measurement
    • Lastly, we measure the individual grounds with the Selective test. This will verify the integrity of the individual grounds, their connections, and determine whether the grounding potential is fairly uniform throughout. If any of the measurements show a greater degree of variability than the other ones, the reason for this should be determined.