Incoming Gas cross bonded off cold water

[TJ Anderson]

But doesn't want trunking or walls chased... Oh the joys!

Well then it can't be done then. Would not bother me at all. Note on cert. No worries.

 

[polo1]

It would not help him as he stated that the water bond is next to CU.

Ah yes. It's been a long week!

 

[Leesparkykent]

But doesn't want trunking or walls chased... Oh the joys!

tel her she needs a magician not an electrician lol

 

[TJ Anderson]

I know what to do here. Install a bonding clamp on gas pipe with a short piece of 1mm connected to it. Tell kitchen fitter it is an aerial for your wireless bonding arrangement back to MET. He will definately believe you as he does not understand electrical type stuff thingys. Then tell customer it is free. Everyone will love you.

 

[Dave OCD]

If there's 'negligable impedance' between the bonded cold water main near the CU and the cold feed in the kitchen [i.e. the same pipework with no plastic in between] then from a common sense point of view it will be absolutely fine. As TJ Anderson has said just note it on the certificate and hide that one from the assessor when he next turns up.

 

[highspark]

I know what to do here. Install a bonding clamp on gas pipe with a short piece of 1mm connected to it. Tell kitchen fitter it is an aerial for your wireless bonding arrangement back to MET. He will definately believe you as he does not understand electrical type stuff thingys. Then tell customer it is free. Everyone will love you.

The main issue I have is this other "spark" being involved! Ideally I'd like the Gas to be bonded back to the MET but if he wasn't involved I'd quite happily have just noted on cert! If the units weren't removed I'd have never have known anyway as Clamp is present on incoming gas pipe and would have tested via a long lead!

 

[Dave OCD]

I know what to do here. Install a bonding clamp on gas pipe with a short piece of 1mm connected to it. Tell kitchen fitter it is an aerial for your wireless bonding arrangement back to MET. He will definately believe you as he does not understand electrical type stuff thingys. Then tell customer it is free. Everyone will love you.

It will only work with a green/yellow aerial though !

 

[TJ Anderson]

It will only work with a green/yellow aerial though !

Of course, I feel a bit embarrassed now. How could it transmit an earth signal without it!

 

[TJ Anderson]

The main issue I have is this other "spark" being involved! Ideally I'd like the Gas to be bonded back to the MET but if he wasn't involved I'd quite happily have just noted on cert! If the units weren't removed I'd have never have known anyway as Clamp is present on incoming gas pipe and would have tested via a long lead!

Just to clarify, I was not serious about the RF bonding suggestion. (I want to patent it first before you lot start using it!)

 

[Dave OCD]

Of course, I feel a bit embarrassed now. How could it transmit an earth signal without it!

Precisely, imagine if you accidentally used a brown wire and transmitted 230v to the pipe !:lol:

 

[davesparks]

I dont have a regs book to hand so am working from memory here, but if it serves me correctly then:
If the cross sectional area of the copper of the water pipe is at least equal to the size required for a protective conductor (in this case a main bond) then it may be used as a protective conductor. But steps need to be taken to ensure that the pipe remains unbroken and electrical continuity be maintained if any alterations are carried out.

 

[sparksburnout]

What Davesparks and TJ have said makes a lot of common sense, and I would agree with them, but the problem is, what happens when there is a leak in that pipe work and Tel's mates turn up with a length of plastic pipe to fix it??

 

[Deleted member 9648]

I dont have a regs book to hand so am working from memory here, but if it serves me correctly then:
If the cross sectional area of the copper of the water pipe is at least equal to the size required for a protective conductor (in this case a main bond) then it may be used as a protective conductor. But steps need to be taken to ensure that the pipe remains unbroken and electrical continuity be maintained if any alterations are carried out.

I don't have a regs book handy either....but I am certain this applies to supplementary bonding only, not main bonding.
I still think this hinges on the type of earthing system. If it is TNCS, which unless I've missed something hasn't been stated, then no other option than a 10mm bond back to the MET is acceptable. It is quite possible on a TNCS system that bonding will result in a parallel path for return currents resulting in it carrying a significant load,a lashed up connection via a water pipe would create a hazard in those circumstances.

 

[sparksburnout]

If we are talking about a loss of neutral (and therefore Earth on a TNCS system), most external gas supply pipes are plastic now anyway so isn't this a bit irrelevant?

 

[Midwest]

If we are talking about a loss of neutral (and therefore Earth on a TNCS system), most external gas supply pipes are plastic now anyway so isn't this a bit irrelevant?

If conditions are as described in reg 528.3.4, then '(ii) fault protection shall be afforded in accordance with the requirements of Section 411.'

Then bonding of metal pipes with plastic service supply, may be required.