That's correct but the regulations state the bonding shall be connected as suggested.
The pipe will still be connected to all the rest.
Replacement of lead water supply pipe with plastic - bonding
- Thread starter Prith
- Start date
The pipe will still be connected to all the rest.
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I'm prepared to be slagged off but I'm pretty sure if your pipe doesn't go to earth and you add an 'escape route' to it, if you have a fault, that pipework will become, potentially, live.
Plastic Water Supply Pipe
IR Test between the copper (tap/pipe) if it is there and the MET.
If it's more than 22KΩ don't bond, and if it's less than 22 KΩ it needs bonding.
Plastic Water Supply Pipe
IR Test between the copper (tap/pipe) if it is there and the MET.
If it's more than 22KΩ don't bond, and if it's less than 22 KΩ it needs bonding.
544.1.2
It is still connected to -
boiler inc. cpcs., CH inc. valves inc. cpcs., gas pipe inc. bonding, MET,
consider it supplementary bonding.
It would have anyway - with potential difference.
It will be <22kΩ.
But if RCD protected? (still a lot to get in me nut!!)
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I only meant that as it's easier to understand what it does in equalising potential difference.
In order to establish if the water service were not now an extraneous conductive part it would be necessary to disconnect it from all of the above mentioned parts to test.
I assume 544.1.2 states what it does is because the disconnection for testing is not going to be done and the regulations still consider that the pipe may be liable to introduce a potential because it is still connected to all of the above mentioned parts.
If anyone else thinks differently perhaps they will say. i'm sure they will.
That is not a consideration for main bonding.
Either way - 544.1.2 says to connect the bonding.
Cheers for the pointers EFL.
Get conflicting opinions at times. I either need to get me nose in the BGB more. Or get out more!
Get conflicting opinions at times. I either need to get me nose in the BGB more. Or get out more!
How do you know that the copper at that point is an extraneous-conductive-part?
No, it's not correct.
The lead pipe is earthed because it has a long run in the ground, and that's why it would need to be bonded.
S
SaladFingers
To be pedantic, yes, it's earthed and needs bonding.
Which talks about main bonding to services entering the building, not metallic parts running through the building.
So basically you want a self-fulfilling prophecy.
If it's only "earthed" because you connect a cpc to it then intrinsically it is not an extraneous-conductive-part.
But we aren't talking about supplementary bonding, and there is no indication that this location requires it.
And why would that be?
SF - we already know that in your mind truth and accuracy are to be conflated with pedantry - you don't need to keep telling us.
I know it most certainly isn't but without going to in-depth discussions with the op about why MPB is carried out and why it may not need doing I advised him to do what 99% of electricians would do who don't have an ounce of engineering judgement.
I would personally enjoy a debate with an NIC inspector who had said that bonding to the main water is required regardless of the material make-up of the incoming pipe.
No doubt someone will be along in a minute to mention about the conducting properties of water with TDS in it !
Indeed you would, for it cannot be an e-c-p if you've connected it to the electrical installation.
How can it be considered to be introducing a potential when what you've done is to connect it to the electrical installation which by definition it must not be part of for it to be an e-c-p?
So first you want a self-fulfilling prophecy, and then you want it both ways.
No it doesn't.
S
SaladFingers
Then you know it almost certainly does not require bonding.
Says it all, really, doesn't it.
This is a UK potable water supply - it's not going to have a high level.
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