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The dreaded bonding again

Kelly Marie Angel

Sorry for this but my boiler recently had her annual service all was well except they said I don't have any bonding in place except I think I do the gas main is bonded in the meter cupboard and the radiators and hot and cold water feeds are all bonded in the bathroom upstairs. All pipework is copper throughout the plumbing never been altered in 40 years except for a new boiler oh and removal of the water tanks. So can I be confident the bonding upstairs is good enough? 

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    You cannot verify the earthing method just by visual inspection of the supply cable. There is a fair chance that your external supply cables have been repaired by inserting a length of 3 core wavecon cable making the earthing TN-C-S (PME). You need to ask your DNO what earthing arrangement you have? If you live in the UKPN area they have declared that where they have supplied and earth from an incoming cable  the supply is TN-C-S (PME). Only premises with their own transformer  on the premises are likely to be TN-S. If the DNO cannot confirm the earthing method the advice is to consider the earthing system to be PME so Table 54.8 for the CSA of the bonding conductor applies.

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    You cannot verify the earthing method just by visual inspection of the supply cable. There is a fair chance that your external supply cables have been repaired by inserting a length of 3 core wavecon cable making the earthing TN-C-S (PME). You need to ask your DNO what earthing arrangement you have? If you live in the UKPN area they have declared that where they have supplied and earth from an incoming cable  the supply is TN-C-S (PME). Only premises with their own transformer  on the premises are likely to be TN-S. If the DNO cannot confirm the earthing method the advice is to consider the earthing system to be PME so Table 54.8 for the CSA of the bonding conductor applies.

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