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What is Grounding Resistance?

what is ground resistance

What is Grounding Resistance? it is the reaction of the soil to pass electrical current. Earth conductor is a weaker conductor than normal conductors such as copper. However, if the area for the current is large enough, the resistance is low and the ground can become a good conductor. This system must be between the conductors and the ground in our system. By making the measurements, necessary calculations and installation of the installation is required after preparation.

What is Grounding Resistance and How is it Measured?

The most commonly used method in resistance measurements is 2-pile measurement forms. P and C electrodes are driven deep into the ground and the distance between these electrodes should be 5-10 meters. Green wire is connected to the ground busbar and it must be separated to the busbar. In addition, the soil where the electrodes are nailed must also be moist. The resistivity of the soil is the resistance of the soil. Its value depends on the structure of the soil and the amount of water in it. The resistance of an electrode to ground depends on the resistivity of the ground. The insulation of each conductor against the ground should be measured with ground resistance test measurement devices and the insulation of conductors against each other with insulation test measurement devices. In addition, it is of utmost importance that Gebze grounding measurement and necessary services are carried out by experts and authorized people.

Earth Voltage Measurement

The ground resistance tester’s stage is brought to ground voltage and the necessary expressions are displayed on the screen. Make sure that the voltage is 10V or less. If values ​​greater than 10V are involved, there may be excessive errors in the ground resistance value. The voltage must be reduced or the source turned off to prevent this erroneous measurement.

 Precise Measurement with Earth Meger

The logic in precise measurement is exactly the same as the sensitivity setting in the multimeters used. The key in your device should be brought to the 2000 ohm position. LEDs become active during the test. If the ground resistance is low, the switch is set to either 200 ohms or 20 ohms. The value shown is the ground resistance of the grounded equipment.

 Why should grounding systems be tested?

Abrasive soils with high moisture and salt content and high temperature can be grounded over time
can damage the rods and their connections. Therefore, low grounding when first installed
in grounding systems with resistance due to corrosion of the ground rods
there may be an increased ground resistance.

 How to Reduce Grounding Resistance?

  • Using special chemicals to reduce resistance
  • To prevent deformation of the connection points
  • Removing corrosion at the joints
  • Selecting grounding electrodes large
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