Earth Resistance: What Is It & Standard Value w/Refs

In summary, Earth Resistance is a measure of the opposition to electric current flow through the earth and is crucial for ensuring the safety of people and equipment in electrical systems. It is typically measured using an Earth Resistance Tester and the standard value varies depending on the type of system and local regulations. Factors such as soil type, moisture, and improper installation can affect Earth Resistance.
  • #1
Arifur
8
0
What is Earth resistance? What is the standard value of Earth resistance? Please help me with reference.
Your co operation will be highly appriciated.
 
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  • #2
Do you mean "ground resistance" (<5Ω recommended for telecommunications & electronics, <25Ω otherwise)? or "soil resistivity" (varies with moisture and temperature typically from 10 to 1000 Ω-m)? or something else?

For ground resistance, see https://support.fluke.com/find-sales/Download/Asset/2633834_6115_ENG_A_W.PDF.
For soil resistance, see https://en.wikipedia.org/wiki/Soil_resistivity
 

Related to Earth Resistance: What Is It & Standard Value w/Refs

1. What is Earth Resistance?

Earth resistance is a measure of the opposition to the flow of electric current through the earth. It is a critical parameter in electrical grounding systems as it ensures the safety of people and equipment by providing a low resistance path for electrical faults.

2. How is Earth Resistance measured?

Earth Resistance is typically measured using a device called an Earth Resistance Tester, also known as a Ground Resistance Tester. This instrument applies a known voltage to the ground and measures the resulting current to calculate the resistance.

3. What is the standard value for Earth Resistance?

The standard value for Earth Resistance varies depending on the type of electrical system and the local regulations. However, a commonly accepted standard value for Earth Resistance in a commercial or industrial setting is 25 ohms or less.

4. Why is Earth Resistance important?

Earth Resistance is important for ensuring the safety of people and equipment in electrical systems. It helps to prevent electrical shocks and damage caused by electrical faults. It also ensures the proper functioning of sensitive electronic equipment by providing a stable reference point for electrical signals.

5. What factors can affect Earth Resistance?

Several factors can affect Earth Resistance, including soil type, moisture content, temperature, and the presence of other conductive materials in the ground. Improper installation or damage to grounding systems can also impact Earth Resistance values.

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