Measure big biulding resistance with Earth tester

In summary, the conversation discusses the process of measuring the resistance of an earthing system using the MI 2124 Earth tester. It is mentioned that this type of testing is important for ensuring the safety of people and equipment within a commercial or industrial building. It is also noted that the testing may require a different instrument for measuring the resistance of installed conductors and for measuring the resistance of the ring to "EARTH." This may involve driving a test rod up to 30 meters or even further in order to accurately measure the safety of the building relative to the utility supply.
  • #1
rohollah200
3
0
HI ALL

We have a big building.there is a ring around the building as earthing system.

we put bare cooper wire in trench around building .

NOW,we are going to measure the resistance of earthing system with Earth tester. Our device is MI 2124 ,one production of METREL .

how I can measure the resistance of big earthing system? can I use MI 2124 for this purpose?
 

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  • #2
Hello Roho -

Been a while since I was in the field - but real meaningful Earth testing of commercial / industrial sites is a tricky subject.

There are 2 different things you may be measuring - the Resistance of ANY point within the Ring - to a central point - typically an Earthing Rod - I believe you may need a different instrument - Higher current and lower resistance because you are measuring the installed conductors. (This is a measure of the safety of the people / equipment in the facility relative to the electrical system )

To measure the Resistance of the Ring ( or this central point) to "EARTH" you will need to drive a Test Rod - in the cut sheet it says 30M max - that may work - but I have seen these tests run to a rod over 1000' Away. ( This is a measure of the safety of the Building relative to the utility supply)
 

1. How does an Earth tester measure big building resistance?

The Earth tester uses a method called three-point testing, which involves injecting a known current into the ground and measuring the resulting voltage. This voltage is then used to calculate the resistance of the building.

2. What is the recommended distance between the test probes for measuring big building resistance?

The recommended distance between the test probes is at least 20 meters. This distance ensures accurate measurements and minimizes the effects of external interference.

3. Can an Earth tester be used to measure resistance of all types of buildings?

Yes, an Earth tester can be used to measure resistance of all types of buildings, including large commercial and industrial buildings. However, the size and complexity of the building may require specialized equipment or techniques.

4. How often should big building resistance be measured?

It is recommended to measure big building resistance at least once every 3 to 5 years. However, if there are any major changes or additions to the building's electrical system, it is important to conduct another measurement to ensure safety and compliance.

5. What is considered a good or acceptable resistance reading for a big building?

The acceptable resistance reading for a big building can vary depending on the specific building and its electrical system. However, a general guideline is for the resistance to be below 1 ohm. Anything above this may indicate issues with the building's grounding system and should be investigated further.

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