The tester is then connected to the earth electrode. Utilizing a ground resistance meter (digital is preferred), two auxiliary electrodes are driven into the soil at predetermined distances, per the testing specifications, in a straight line from the ground being tested.

Fall of potential method is what its called the voltage drop by current flow through the earth from rod to rod . Fall-of-potential measurement. Second, the tester is connected to the earth electrode. The two primary requirements to successfully complete this test are the ability to isolate the grounding system from the utility neutral and knowledge of the diagonal length of the grounding system (i.e. First, the earth electrode of interest must be disconnected from its connection to the site. In the fall of potential method you have three electrodes. a 10’ x 10’ grounding ring would have a 14’ diagonal length). The 2-Point Method The 3-Point Method The Fall of Potential Method The 62% Rule The Ratio Method The Tag Slope Method The Intersecting Curve Method Staged Fault Tests Driving Point Impedance The SGM Method • Continuity/Integrity Testing • Soil Resistivity Measurements • Touch and Step Voltages • Other Tests (Tower/Pole Ground, Transfer V.) What is the Fall-Off-Potential (FOP) method? This involves injecting a current into the ground at a distance from the grounding system under test, and then measuring potential at different points between the grounding system and injector electrode.

Years ago before they had digital meters they used a galvanometer when it was nulled by adjusting the knobs on the meter you read your resistance from … To do the fall of potential method you need to disconnect all these electrodes from the power system, but leave the electrodes connected together. The fall-of-potential method is often referred to as the "three point method". Fall of Potential testing otherwise known as ground resistance testing measures the capacity of an earth ground system to dissipate energy from a particular site. How Does the Fall-of-Potential Test Work? The fall-of-potential method involves passing an electrical current through the grounding system electrode (C1 and P1), and at the same time measuring the electrical potential between the grounding system and a “probing” electrode (P2). The fall-of-potential test method is used to measure the ability of an earth ground system or an individual electrode to dissipate energy from a site. With reference to fall of potential, … The Fall-of-Potential test method is used to measure the ability of an earth ground system or an individual electrode to dissipate energy from a site. A fall of potential test is the most general of methods for meeting the above criteria. It may also be referred to colloquially as a “three-point” test, although this term is also applied to a separate test that is likewise defined in IEEE 81. The 3-point or fall-of-potential method is used to measure the resistance-to-ground of existing grounding systems. The CTK for measurement of earth resistance with fall of potential method can be drawn as follows: (Measurement of earth resistance by fall of potential method) A current is passed through earth electrode an auxiliary electrode B (which usually iron spike) increase in a inserted in earth at a distance away from the earth electrode. You may also want to check out the following articles: How to perform the Fall-Off-Potential method using the SuperSting™ Wifi Short Answer: The FOP method is used for all types of ground impedance measurements to determine a grounding system’s ability to dissipate electrical energy into the ground.

First, the earth electrode of interest must be disconnected from its connection to the site. Reference thread: thread238-231298: Fall of Potential Testing in an industrial plant Good morning all, I wanted to get everyone's experience/opinion on using a clamp on meter instead of the traditional fall-of-potential test for ground testing.

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