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Low Loop Impedance Reading.

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I have been working at a property that is TT earthed. Normally around here the loop impedance readings are between 100 to 200 Ohms for TT systems.


Today I had a reading of just 8.5 Ohms at a distant socket in the property's garage about 30 metres from the main fuse and first earth rod. There is a second earth rod nearby as well.


The reason for the low reading is that the property is next to a staithe with a canal nearby. The water table is only about half a meter under the garden soil. I saw this as ground work is being undertaken. Amazing. The lowest rod resistance I have ever seen.


Z.


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    It’s not unknown for a buried water main to be acting as a neutral return for a large number of installations, water board guys and contractors have died cutting sections of pipe out and removing them.


    It seems it is more of a problem in Australia with their MEN earthing system and water pipes used as earth electrodes.
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  • 0
    It’s not unknown for a buried water main to be acting as a neutral return for a large number of installations, water board guys and contractors have died cutting sections of pipe out and removing them.


    It seems it is more of a problem in Australia with their MEN earthing system and water pipes used as earth electrodes.
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