Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 25 replies
  • Subscribers 32 subscribers
  • Views 2679 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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? 

  • 0

    Are the water pipes main bonded or is that supplementary bonding ?   Is your incoming water pipe at the stop tap plastic ?  

     

    Gary

  • 0

    The pipes are all metal no plastic anywhere. If it helps the water bonds upstairs are run straight back to the MET the ststem is tns the main earth clamped to the lead sheath of the  DNOs cable

  • 0

    This is the expectation that the main bonding is right by the stop tap, but no measurement is made. Very common. 

  • 0

    Sorry to intrude BUT… why was ‘cross bonding’, (something I always used to do, in the past), stopped, (introducing a ‘potential’ where it didn't exist)?

    Thanks / regards… Tom

  • 0

    Kelly

     

    There should be a main protective bond to the gas and water installation pipes ideally within 600mm of the water stop valve or gas meter outlet. Alternatively within 600mm of the point of entry of the installation pipe to the building if the meter is external.

    How do you know your installation is TN-S?

    JP

     

     

     

  • 0

     

    Do they mean the plumbers' favourite unnecessary looping between the pipes under the boiler?

     

     

    There should be a main protective bond to the gas and water installation pipes ideally within 600mm of the water stop valve or gas meter outlet. Alternatively within 600mm of the point of entry of the installation pipe to the building if the meter is external.

    Not so.

    The 600mm. only applies (wrongly) to the outlet side of internal gas meters.

     

    Everything else is “at the point of entry where practicable”

  • 0

    Geoff

    My BS 7671 says this:-

    544.1.2 The main protective bonding connection to any extraneous-conductive-part such as gas, water or other metallic pipework or service shall be made as near as practicable to the point of entry of that part into the premises. Where there is a meter, isolation point or union, the connection shall be made to the consumer’s hard metal pipework and before any branch pipework. Where practicable the connection shall be made within 600 mm of the meter outlet union or at the point of entry to the building if the meter is external.

    What does your book say?

     

    JP

     

  • 0

     

    Exactly.

  • 0

    The gas bond is in the house right where the gas pipe comes out from under the cement floor its as close to the meter as possible doing it any closer would mean a lot of mess and of course cost. The water bonds are all upstairs in the bathroom they were put there before the boiler was installed they were done when the SEB as it was then installed the shower. Finally I know its TNS because it looks like TNS as I say the earth is clamped to the lead supply cable sheath  although there is also some unintentional earthing via the water and gas pipes  this is the intended way. 

  • 0

    So why are you saying the regulation does not apply to external gas meters. It's an “or” not a “shall”.

Community Rules & Guidelines