I've pondered this in my own property, and although testing it as you would an earth rod would confirm whether a 50V touch potential were likely, with the amount of intended and accidental bonding in bathrooms, boilers and kitchens, I think it would be virtually impossible to confirm that the pipework really was truly extraneous.
Is thia earth cable necessary?
- Thread starter veedee
- Start date
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They all do!Looks like this thread grew legs again
If the water pipework entering the building were plastic then (at least in electrical terms) there would be nothing to main bond (i.e., by definition, no extraneous-c-p). If regulations appear to require main bonding of a metal pipe which does not enter the property from outside, those regulations must (in my opinion) have been written by someone with no understanding of the concept and purpose of main bonding!
Kind Regards, John
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Well, if you have a house with a load of CH pipes direct buried in screed (it happens) then it could be an issue. But it would be a very dry earth, and you'd find out when the floor got wet due to the concrete attacking the copper.
Fair enough. I would think that metal pipes emerging out of screed (or soil!) would have to be considered to be extraneous-c-ps (even if 'dry when tested') and main-bonded where they first showed themselves above the screed.
Kind Regards, John
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