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Anonymous Poster #1

Pipe Earthing and Counterpoise Earthing

02/02/2019 9:52 PM

Dear Sirs,

In transmission line towers, how to decide, where to keep pipe earthing and where to keep counterpoise earthing?

In one transmission line tower, is it possible that in all the legs - pipe earthing or countepoise earthing is done?

Best Regards,
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7anoter4
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#1

Re: Pipe Earthing and Counterpoise Earthing

02/03/2019 11:30 AM

I think you mean "tower footing" by "pipe",do you?

See-for instance:

https://orca-mwe.cf.ac.uk/42730/1/Ahmeda%20-%20Thesis%20Final%20Copy.pdf

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redfred
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#2

Re: Pipe Earthing and Counterpoise Earthing

02/03/2019 5:14 PM

What does your local code state?

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Circuit Breaker
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#3

Re: Pipe Earthing and Counterpoise Earthing

02/04/2019 8:54 AM

The codes in these unlisted places must say something like "To be installed as directed by CR4." -- JHF

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#4
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Re: Pipe Earthing and Counterpoise Earthing

02/04/2019 9:16 AM

That would be useless. We rarely agree on anything.

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Brave Sir Robin
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#5
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Re: Pipe Earthing and Counterpoise Earthing

02/04/2019 1:02 PM

But we all have our tongues firmly inserted in our cheeks.

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PWSlack
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#7
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Re: Pipe Earthing and Counterpoise Earthing

02/04/2019 2:38 PM

Better than thumbs inserted elsewhere. ��

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#6

Re: Pipe Earthing and Counterpoise Earthing

02/04/2019 1:56 PM

Pipe earthing, using existing underground conduits as electrodes for grounding, potential equalization, can be risky for several reasons, not the least is galvanic corrosion which can damage both your ground system and the pipe. Providing your own network of ground electrodes, counterpoise provides you with an engineered and (relatively) known quantity to protect your transmission line.
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PWSlack
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#8

Re: Pipe Earthing and Counterpoise Earthing

03/24/2019 8:14 AM

Earthing using buried water pipes falls outside the provisions in BS7671, latest edition. The reason is that plastic water pipes now prevail in the UK for domestic installation. Earthing now needs to be installed according to local codes in another way.

There is a comprehensive article on earthing in Wikipedia that explains the principles of each method.

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