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I'm doing a bathroom refurb this week. Today I inspected the existing install. The bathroom only has lighting circuit in it (6A mcb, no RCD protection).
The hot & cold services have supplementary bonding, as does the CH towel radiator. The non electric shower hot & cold service does not have supplementary bonding.
Tested continuity to all these pipes gives a reading of 0.04ohms to local cpc. Regulation 702.415.2, states all extraneous conductive parts shall be connected by supplementary bonding etc.......in accordance with reg 415.2. Using that formula (415.2) gives me a figure of 1.6ohms, less than my 0.04.
My thinking is that these pipes are effectively bonded elsewhere(supplementary, and I forgot to check the airing cupboard ) and therefore the existing supplementary bonding does not require re-attaching. I only ask, as the shower has no visible supplementary bonding, and the towel radiator is being replaced, and the current one has a lovely EC clamp on the lowest bar?
The hot & cold services have supplementary bonding, as does the CH towel radiator. The non electric shower hot & cold service does not have supplementary bonding.
Tested continuity to all these pipes gives a reading of 0.04ohms to local cpc. Regulation 702.415.2, states all extraneous conductive parts shall be connected by supplementary bonding etc.......in accordance with reg 415.2. Using that formula (415.2) gives me a figure of 1.6ohms, less than my 0.04.
My thinking is that these pipes are effectively bonded elsewhere(supplementary, and I forgot to check the airing cupboard ) and therefore the existing supplementary bonding does not require re-attaching. I only ask, as the shower has no visible supplementary bonding, and the towel radiator is being replaced, and the current one has a lovely EC clamp on the lowest bar?