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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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testing bathroom supplementary equi-potential bonding
Hi
I've done a search of the archives but can't find an answer to the following question: I totally refitted my bathroom a few months ago, but was unaware at the time of the requirement for supplementary bonding. Now I'm aware of it I'd like to make sure that I have it and it functions correctly. I suspect that the original bathroom had the bonding as the house was built in the 70s, and as I understand the wiring regs bonding was a requirement at this time. I'd therefore like to make use of this bonding if present (with additions for a new shower pump) to avoid having to do any destructive work. However, if it is present it is largely under the floor boards, under my laid flooring, and thus I can't easily check for it by eye. I'd therefore appreciate any input on how I might go about testing for it using a basic multimeter on the exposed pipework, lights etc. Thanks in advance -Neil |
#2
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testing bathroom supplementary equi-potential bonding
However, if it is present it is largely under the floor boards, under
my laid flooring, and thus I can't easily check for it by eye. I'd therefore appreciate any input on how I might go about testing for it using a basic multimeter on the exposed pipework, lights etc. This will be difficult, as it is likely that your main equipotential bonding already provides a low impedence path between copper pipework and electrical fittings. I doubt your 1970s house has plastic pipework. Christian. |
#3
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testing bathroom supplementary equi-potential bonding
Christian McArdle wrote:
This will be difficult, as it is likely that your main equipotential bonding already provides a low impedence path between copper pipework and electrical fittings. I doubt your 1970s house has plastic pipework. All the bonding connections should be accessible, or reasonably so (in principle...). It should be possible disconnect each in turn and make a resistance measurement to another bonded point. The resistance of 4 mm^2 copper at 20 deg. C will be 4.6 milliohm per metre or less. Excessively high readings should arouse suspicion as they suggest that the path may be a long one, i.e. not bonding "in close vicinity." You need a good low resistance ohmmeter for this sort of thing (resolution to 0.01 ohm) and a reliable long test lead. An ordinary multimeter's no good, except for detecting open circuits. -- Andy |
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