Query from the Combustion Chamber......................

[FiremanT]

I can see this post (not mine btw) becoming a 10 pager without a definitive answer, so maybe you guys can cast some light ? Thanks.:


I've got a job where their is a new gas meter & boiler going in at one end of a property & the electric incoming & consumer unit is at the other end. Customer does want floors up or really seeing the earth cable externally.
Their maybe a solution in their will be a redundant oil line under the ground floor screed, if at all possible to thread the earth cable through this pipe is this allowed or not? Probably not. Or earthing the gas to the already earthed mains water, pretty sure this isn't allowed.

Sparkies amongst us can one do either of these two options


Read more: //www.diynot.com/forums/combus...l-earth-bonding.371664/#2832988#ixzz2aEXvCTWD

 

[FiremanT]

20 views and no comments?

 

[EFLImpudence]

Or earthing the gas to the already earthed mains water,

Yes, that will be fine.

It's bonding - not earthing.

Sparkies amongst us can one do either of these two options

Why do they not know?


The link does not work.

 

[JohnW2]

Or earthing the gas to the already earthed mains water,

Yes, that will be fine. It's bonding - not earthing.

I think that needs clarification. I presume you mean that the main bonding conductor to the water service could be extended to boind the gas supply - which would be fine if they both entered the premises fairly close. However, I thought (maybe wrongly) that the OP was asking (and your response would appear to be a 'yes') whether the incoming gas supply could be bonded to some nearby water pipe.

The link does not work.

That would be because us mere mortals are not allowed access to the 'Combustion Chamber'. The OP probably didn't include the link delibereately - it's one of those 'copy and paste' quirks of this forum!

Kind Regards, John

 

[FiremanT]

Or earthing the gas to the already earthed mains water,

Yes, that will be fine.

It's bonding - not earthing.

I know (honest ) I just cut and pasted OP s query

Sparkies amongst us can one do either of these two options

Why do they not know?

As far as I can see no sparks has responded. I somestimes see "securesparks" name, but that may be in P&H, and you have to be GasSafe registered to enter the CC. So maybe there are no sparks able to view it!


The link does not work.

No, sorry, it won't, for reason above.

Thanks. I assume you mean the run through the ex oil line is ok, rather than bonding to the water?

 

[Lectrician]

Run new cable from water to gas.

Disconnect cable from water.

Through crimp new cable to old.

Remove an inch of insulation from new cable and wrap wround water bond clamp.

If looping main bonding, it must be one continuous piece of cable (hence crimping and LOOPING it around the terminal on the water clamp).

 

[EFLImpudence]

Thanks. I assume you mean the run through the ex oil line is ok, rather than bonding to the water?

As John has pointed out -

I did assume you meant a connection to the water's bonding conductor, not just the pipe.

I suppose running through the redundant pipe would be alright.
Technically, I suppose you could actually use the pipe itself but I think that would be fraught with problems for the future.

 

[JohnW2]

I assume you mean the run through the ex oil line is ok, rather than bonding to the water?

As I've just implied by what I wrote, bonding the gas service to a (bonded) water pipe would not be acceptable, but extending a bonding cable from the water service to the gas pipe would.

As for the oil line, there is nothing in the Wirings regs of which I'm aware that would prevent you from running a bonding conductor through a disused oil line. The worry is that someone might one day cut through the oil line to remove it, so it would sensibly have green/yellow tape (and maybe 'warnings') attached in any accessible locations (obviously in screed would not need that). The compatability of residual oil with the cable's insulation would be a theoretical issue, but it frankly probably doesn't matter much for a bonding conductor. The real problem is that, certainly unless the entire run of the oil line is dead straight, I don't think you'd stand a chance in hell of getting a 10mm² cable through it!

Edit: as EFLI has said, using the oil line itself as a bonding conductor is a theoretical possibility, but that would introduce various potential problems.

Kind Regards, John

 

[EFLImpudence]

If looping main bonding, it must be one continuous piece of cable

No, it doesn't.

 

[JohnW2]

If looping main bonding, it must be one continuous piece of cable (hence crimping and LOOPING it around the terminal on the water clamp).

Per regs, it doesn't have to be a continuous piece of cable, whatever NIC may say. In any event, if one believed that it did have to be, a crimped joint between two cables would surely not create a 'continuous cable', would it'?!!

Remove an inch of insulation from new cable and wrap wround water bond clamp.

'wrap around the clamp'? Do you mean connect/terminate it to the clamp?

Kind Regards, John

 

[ban-all-sheds]

Being one of the early 20 viewers. who then wandered off before replying, and did not do a page refresh upon returning....

Customer does want floors up or really seeing the earth cable externally.

Their maybe a solution in their will be a redundant oil line under the ground floor screed, if at all possible to thread the earth cable through this pipe is this allowed or not? Probably not.

It's allowed.

But possibly moot - could you get a cable through? What size is the pipe? Is it clean?

Or earthing the gas to the already earthed mains water, pretty sure this isn't allowed.

It's not.

 

[ban-all-sheds]

Technically, I suppose you could actually use the pipe itself.

No - not for main bonding.

Even if it were metal, which we don't know anyway.

 

[JohnW2]

Technically, I suppose you could actually use the pipe itself.

No - not for main bonding. Even if it were metal, which we don't know anyway.

I said it as well - although, as you point out, neither EFLI nor myself qualified that it would obviously have to be metal!

However, if it is a copper pipe of adequate CSA, I'm wondering what reg you are thinking of which would prohibit its use as a bonding conductor?

Kind Regards, John

 

[ban-all-sheds]

There's no reg which forbids it, but neither is there one which allows it.

But as there is one which explicitly allows it for supplementaries, and there isn't one for mains, my interpretation is that is is not allowed

 

[EFLImpudence]

Isn't it the case that pipes which are 'part of the installation' may be used as supplementary but not as main.

However, surely an additional (metal) pipe could be used as either.