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HappyHippyDad

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The water pipes enter the house in metal, then there are a few cm's of copper after the stop cock and then plastic. It is hidden behind the kitchen draws (which can be removed to access).

Does this require Main Bonding? The stop cock tests as 0.36Ω to earth, it is TNCS.

I just cant see how fitting a Main Bonding cable achieves anything in this case?
 
I would say no based on niceic advice at tech talk, but I wasn't sure about that advice as the water in the copper and plastic pipes is conductive so a path to earth can penetrate.

Before anyone says anything I know pure water isn't conductive.
 
Having just watched John Ward again
I realise it does need bonding (along with what SL said above). There is the possibility (although ridiculously small) of being in contact with the stop cock and an exposed conductive part at the same time.
 
Based on your description it does not require main bonding. However if the very limited extraneous CP's are simultaneously accessible with conductive parts then I would reverse the above and bond it.
 
The water pipes enter the house in metal, then there are a few cm's of copper after the stop cock and then plastic. It is hidden behind the kitchen draws (which can be removed to access).

Does this require Main Bonding? The stop cock tests as 0.36Ω to earth, it is TNCS.

I just cant see how fitting a Main Bonding cable achieves anything in this case?
DRAWER mate
 
What was your first thought when you first saw this set up, what does your conscience say? My first thought was “bond it” based on your description.
 
I'm voting to bond. Plus, the Homeowner could change out the plastic at some point, just saying :rolleyes: .
 
Your own test has determined that the incoming pipe is extraneous so needs bonding as per BS7671:2018.

Whether or not it does anything or not is a mute point as BS7671 does not give much wriggle room. Is it extraneous? Yes. Is there an insulating section at the incoming point to the property? No. So it requires bonding whether we like it or not. There is nothing in BS7671 that states the main incoming water pipe needs to be accessible - 544.1.2.
 
The water pipes enter the house in metal, then there are a few cm's of copper after the stop cock and then plastic. It is hidden behind the kitchen draws (which can be removed to access).

Does this require Main Bonding? The stop cock tests as 0.36Ω to earth, it is TNCS.

I just cant see how fitting a Main Bonding cable achieves anything in this case?

Your own test has determined that the incoming pipe is extraneous so needs bonding as per BS7671:2018.

Whether or not it does anything or not is a mute point as BS7671 does not give much wriggle room. Is it extraneous? Yes. Is
there an insulating
section at the incoming point to the property? No. So it requires bonding whether we like it or not. There is nothing in BS7671 that states the main incoming water pipe needs to be accessible - 544.1.2.
The OP appears to state there is an insulating section close to the point of entry. Of course the stopcock will be extraneous, but the regulations clearly state now that a short section of incoming pipe which has an insulating section close to the point of entry will not require main bonding.
 
The OP appears to state there is an insulating section close to the point of entry. Of course the stopcock will be extraneous, but the regulations clearly state now that a short section of incoming pipe which has an insulating section close to the point of entry will not require main bonding.

As above- it has to be at the point of entry, not close to.
 
The OP appears to state there is an insulating section close to the point of entry. Of course the stopcock will be extraneous, but the regulations clearly state now that a short section of incoming pipe which has an insulating section close to the point of entry will not require main bonding.

Only applies if a blue plastic service pipe, does not apply if a metal service pipe!
 
I would say no based on niceic advice at tech talk, but I wasn't sure about that advice as the water in the copper and plastic pipes is conductive so a path to earth can penetrate.

Before anyone says anything I know pure water isn't conductive.

Do we get pure water out of a tap?
 

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