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  • Figure 1: Negatively-Grounded PV System (DC Side)

    The hidden hazards of ground faults in PV systems

    Why DC ground faults in PV systems are hidden hazards you need to detect before it’s too late. Find the blind spots in PV systems. Solar ground fault troubleshooting.
  • Why Ground, Why Test

    Why Ground, Why Test?

    Poor grounding contributes to unnecessary downtime, but a lack of good grounding is dangerous and increases the risk of equipment failure. Without an effective grounding system, you could be exposed to the risk of electric shock, not to mention instrumentation errors, harmonic distortion issues, power factor problems and a host of possible intermittent dilemmas. If fault currents have no path to the ground through a properly designed and maintained grounding system, they will find unintended paths that could include people.
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    Selective Measurement

    Selective testing is very similar to the Fall-of-Potential testing, providing all the same measurements, but in a much safer and easier way. This is because with Selective testing, the earth electrode of interest does not need to be disconnected from its connection to the site! The technician does not have to endanger himself by disconnecting ground, nor endanger other personnel or electrical equipment inside a non-grounded structure.
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    Stakeless Measurement

    The Fluke 1625 earth ground tester is able to measure earth ground loop resistances for multi-grounded systems using only current clamps. This test technique eliminates the dangerous, and time consuming activity of disconnecting parallel grounds, as well as the process of finding suitable locations.
  • Leading facility solutions firm upgrades popular instrument with Fluke Connect model

    Soil Resistivity Measurement

    Soil Resistivity Measurement
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    Fall-of-Potential Measurement

    Fall-of-Potential Measurement
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    Grounding Basics

    Grounding Basics
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    Measuring Ground Resistance

    Measuring Ground Resistance
  • Chasing "ghost" trips in GFCI-Protected Circuits

    Chasing "ghost" trips in GFCI-Protected Circuits

    This issue of "Solid Ground" talks about ground fault circuit interrupters (GFCIs), why they are necessary, and how to troubleshoot GFCI-protected circuits.

  • Earth ground testing for mine sites with Fluke 1625

    Earth ground testing for mine sites with Fluke 1625

    All mine sites have grounded electrical systems, so that in the event of a lightning strike or utility overvoltage or ground fault, the current would be able to find a safe path to earth or the neutral of the transformer.

  • Grounding separately derived systems

    Grounding separately derived systems

    As I promised in my last column, this "Solid Ground" column deals with transformers and grounding. Let's start by addressing some definitions. Opinions differ on the "official" definition of "distribution" transformer.
  • Measuring ground loop resistance without stakes

    Measuring ground loop resistance without stakes

    Normal earth ground measurement involves disconnecting parallel grounding rods, "planting" several auxiliary grounding stakes, and using a earth ground tester to calculate the resistance of grounding system electrodes. Sometimes, though, there isn't anywhere to plant the grounding stakes - such as inside a building, at a cell phone substation, or on power pylons. What then?
  • Reassessing airport tower lightning protection systems

    Reassessing airport tower lightning protection systems

    Reassessing airport tower lightning protection systems with checklist for ensuring reliable lightning protection, with aid of ground resistance

  • Testing electrical bonds

    Testing electrical bonds

    Expert, Chuck Newcombe, revisits techniques from 1963 for testing the electrical bonds in a grounding system and compares them with today's tools and methods.

  • Some grounds for suspicion

    Some grounds for suspicion

    Earth ground testing definitions and methods: grounding and bonding, purpose of the earth ground, Fall of Potential test, stakeless ground testing