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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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    John Peckham: 
     

    Geoff

    You bond the gas and water  installation pipes not the service pipes see Regulation 411.3.1.2. In fact you are not allowed to bond a gas service pipe without the consent of the National Grid for the reason Mike above has said. The gas supply may have an insulated insert either a ceramic one from years gone by or a plastic one in modern times. I have a picture of a gas control valve with a plastic insert somewhere I will see if I can find it and post on here. My house has been surveyed by gas and water suppliers to have my service pipes replaced. I will see if they if they renew the gas control valve if they install one with a plastic insert.

     

    411.3.1.2 says extraneous-conductive-parts must be main bonded, then says:

    Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding.

    It depends how close to the point of entry, but if any of the service pipe before an insulated section is accessible then it should be bonded. 

     

    Whatever the gas regulations state:

    If the supply has an insulated insert then you are not bonding the service pipe which is the ext-c-p  and the consumer's side is not an ext-c-p.

    If the supply does not have an insulated section and you bond the consumer's side then you are bonding the service pipe - so should connect the bonding conductor to the service pipe.

     

     

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  • 0

    John Peckham: 
     

    Geoff

    You bond the gas and water  installation pipes not the service pipes see Regulation 411.3.1.2. In fact you are not allowed to bond a gas service pipe without the consent of the National Grid for the reason Mike above has said. The gas supply may have an insulated insert either a ceramic one from years gone by or a plastic one in modern times. I have a picture of a gas control valve with a plastic insert somewhere I will see if I can find it and post on here. My house has been surveyed by gas and water suppliers to have my service pipes replaced. I will see if they if they renew the gas control valve if they install one with a plastic insert.

     

    411.3.1.2 says extraneous-conductive-parts must be main bonded, then says:

    Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding.

    It depends how close to the point of entry, but if any of the service pipe before an insulated section is accessible then it should be bonded. 

     

    Whatever the gas regulations state:

    If the supply has an insulated insert then you are not bonding the service pipe which is the ext-c-p  and the consumer's side is not an ext-c-p.

    If the supply does not have an insulated section and you bond the consumer's side then you are bonding the service pipe - so should connect the bonding conductor to the service pipe.

     

     

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