Does this require Main Bonding?

[HappyHippyDad]

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?

 

[Nigel]

Yes it does require bonding.

 

[Deleted member 26818]

I would say yes.
If someone were to use the stopcock to turn off the water, who knows whether they’ll be wet, in contact with other earthed conductive-parts, or whatever.

 

[Deleted account]

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.

 

[HappyHippyDad]

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.

 

[westward10]

You do not want to base your methods of work from NICEIC or any scheme tech talks.

 

[Deleted member 9648]

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.

 

[richy3333]

Bond it

 

[Pete999]

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

 

[Fitzy]

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.

 

[Deleted member 9648]

Whats his conscience got to do with it?

 

[Wilko]

I'm voting to bond. Plus, the Homeowner could change out the plastic at some point, just saying .

 

[DefyG]

Metal pipe in the ground - extraneous - Bond it!

 

[Nigel]

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.

 

[HappyHippyDad]

Many thanks for all the replies.

It gets bonded!