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Equipotential bonding dilemma!

I have an issue on which I would value your opinions.

I’ve been conducting EICRs in a building developed over the 16th, 17th and 18th centuries, more castle than domestic dwelling, though it is now providing around 20 flats. The properties were rewired in the early 80’s. I’ve found a number with no MEB to incoming water or gas or both. The issue is that the cut outs and consumer units are, without exception, the opposite end of the properties from where gas and water enter the properties.

It’s a listed building so nothing can be run externally, floors are polished hardwood ( not sure what vintage) and ceilings are ornate plasterwork.

Although all were rewired under one contract, many have had electrical alterations and additions since, except bonding. That said, the typical set up is a MK board with an up front 80A, 30mA rccb with 3871 type 2 mcbs for the domestic circuits, along with a separate off peak board serving storage heating. In the flats which have had gas installed, some of the former off peak circuits are now  radials with socket outlets with no rcd/rcbo protection.

Readings suggest PME/tnc-s supplies, a few have PME stickers.

So, to my question - is there any way I can address the lack of access to install bonds to water gas ( leaving aside ripping up historic floor boards or getting copper services changed to plastic)? Innovative, whacky, off the wall suggestions welcomed as are technically sound, difficult ones!

TIA
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  • mapj1:

    Certainly the gas meters in the houses round here give a  metallic connecition from inlet to outlet.

    The offical advice (quoting form) here




    Provision of earth terminal requires that where a metallic gas service is provided to a consumer’s premises with a PME earth terminal, an insulated insert should be fitted in the gas service.




    In the OP, we are told that some of the flats' installations have PME stickers, so it probably doesn't apply in this case; but the above quote doesn't help where a TN-S supply has been "PME'd" subsequent to the installation of a metal gas pipe all the way to the meter. 

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  • mapj1:

    Certainly the gas meters in the houses round here give a  metallic connecition from inlet to outlet.

    The offical advice (quoting form) here




    Provision of earth terminal requires that where a metallic gas service is provided to a consumer’s premises with a PME earth terminal, an insulated insert should be fitted in the gas service.




    In the OP, we are told that some of the flats' installations have PME stickers, so it probably doesn't apply in this case; but the above quote doesn't help where a TN-S supply has been "PME'd" subsequent to the installation of a metal gas pipe all the way to the meter. 

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