Calor Gas Bonding on a static caravan

[Engineer54]

Thanks Geoff, I appreciate that and I am just hoping to tap into the wealth of knowledge on this forum and thought maybe there might be people here that have more experience with working on these installations than I do. As I said I cannot see how it could introduce an earth potential into the installation (no part of the pipework is buried or in contact with the ground) so therefore I would say that it cannot be called an extraneous conductive part. That is not to say that I am right, and any opinion is valuable to me, hence the post

Correct!!

 

[jc-electrical]

Thanks very much for all your replies guys.

 

[44ALLAN]

Post 5 and 7 is your answer mate no good guessing !!

 

[jc-electrical]

Understood, thanks mate. The only issue I have with testing that way is getting misleading results due to parallel paths - ie the water and gas pipes are both connected to the boiler so I would end up also testing the water pipe (which I know is an extraneous part) ... or am I getting things mixed up?

 

[44ALLAN]

Understood, thanks mate. The only issue I have with testing that way is getting misleading results due to parallel paths - ie the water and gas pipes are both connected to the boiler so I would end up also testing the water pipe (which I know is an extraneous part) ... or am I getting things mixed up?

Your always going to get that problem testing from the Met to incoming services unless you can totally disconnect everything else............never going to happen though is it !

You said.........
"They are just gas bottles, sat on a concrete base with a copper pipe running beneath the caravan and up to the boiler."
Then you said...........
As I said I cannot see how it could introduce an earth potential into the installation (no part of the pipework is buried or in contact with the ground)

Only Extraneous conductive parts need Main bonding so if your confident that copper pipe is floating in mid air or totally insulated and will never touch earth by any means then no need to bond it mate.
However...............

 

[jc-electrical]

Cheers mate. You remind me of my NIC inspector with that 'however' ....

 

[44ALLAN]

Cheers mate. You remind me of my NIC inspector with that 'however' ....

Lol
Sry mate

 

[diditrain]

If you know that the water is plastic then can you not disconnect your earthing conductor and perform the test as per post 5 and 7

 

[44ALLAN]

If you know that the water is plastic then can you not disconnect your earthing conductor and perform the test as per post 5 and 7'

" ie the water and gas pipes are both connected to the boiler so I would end up also testing the water pipe (which I know is an extraneous part):

Don't think he said water was plastic?
The point I was trying to make was -- if? it isn't extraneous then it doesn't need a main bond...........however lol..........

It will be connected to the main earth via pipes/boiler etc (inside the equi zone) so during fault conditions blah blah it will rise to mains voltage and is sitting there on a nice 'wet' concrete slab attached to a great big metal gas bottle with loads of lush wet grass next to it.

Same as running a copper pipe to your garden hose really if you think about it lol.
Ahhhh..........rcd will cover that though surely

 

[Engineer54]

Ahhhh..........rcd will cover that though surely

Two of them actually, ....and in series with each other, if i have read the OP correctly!! lol!!

 

[Badged01]

As our learned colleagues have stated, give it an IR test between the pipework and the earth point. If greater than 23Kohms bond it, if not leave alone else you could be introducing an earth potential!

Not a caravan man myself but if the bottle is on a concrete base I cant see how it will introduce an 'earth'?

 

[Badged01]

oops ..... seem to be out of synch with this thread somehow! All the answers have been given ......

 

[Simlec]

As our learned colleagues have stated, give it an IR test between the pipework and the earth point. If greater than 23Kohms bond it, if not leave alone else you could be introducing an earth potential!


Are you sure your statement is correct?

 

[44ALLAN]

 

[Badged01]

Double oops ...... good spot, should state that less than 23K needs bonding!