What Is The Earth's Resistance Value?

• What is the earth's resistance value?

The earth's resistance value is an ohmic value and will vary depending on the location, texture and type of the soil. It is the resistance that the soil in one particular area has to an electric current that could run through it.

• How the earth's resistance value is measured?

The earth's resistance value is measured in ohms using an earth tester.

• How soil affects the earth's resistance value?

There are different types of soil all over the world and they can vary even with a short distance of one another. Soil can be chalky or like clay. Soil could be like peat or extremely moist or extremely dry like sand. It could also be full of electrolytes or have very few or it could be rich in nutrients and salt. The temperature of the soil can also make a considerable difference so it is possible that the earth's resistance will change during the seasons. All of these factors will affect the earth's resistance value. It is the resistance of the soil that will allow the electrical current to pass through and therefore establish the resistance value.

• Why do we measure the earth's resistance value?

We measure the earth's resistance value to check the area when installing electrical equipment. It may also be done as part of a routine maintenance check to establish whether or not that particular area has the same resistance value as it was originally recorded at. It may be possible for the resistance value to change over time as the area changes and the soil in the area may change. It is important for these maintenance checks to be done on a regular basis to ensure everything is working correctly and the values are all known.

O to 5  ohms

Earth resistance is below 1 ohms. Its measured by Earth resistance meter.

Protective earth continuity tester with 10A up to 100A AC

Earth resistance is below 1 ohms. Its measured by Earth resistance meter.

Neutral Grounding Resistors protect power equipment

72R

The resistance is between 1-10ohm