Gas boiler earthing

[keenamateur]

Hi

Do the pipes coming from a Gas central heating boiler (domestic)need to be joined together with clamps and earth wire?

if so

where does wire join to?

What size of wire?

Why do this - kitchen bathroom or elsewhere

if not

why not?

I've done a search but there is not much conclusive on this

thanks to anybody who takes the time to reply

 

[Spark123]

There are no electrical regs which require the cross bonding of the pipes entering a boiler. Of course, if the manufacturer of the boiler specifies it then it must be done. If a boiler is in or close to a bathroom then cross bonding the pipes may count towards the supplementary bonding of the location.

 

[JohnD]

The Corgis seem to believe it is required. It can only be Supplementary Bonding, so if you are doing it, 4mm G&Y to all the pipes around it (including the gas supply) and to the CPC of any circuit nearby (certainly the one that feeds the boiler, pump and thermostats (probably all the same circuit), but if there is an immersion heater, that too. You could do that in the airing cupboard, and use the copper pipes as part of the bonding circuit.

If the boiler is supplied by a plug, the bonding would have to be from its socket or some other convenient point. I believe the Corgis say you can't rely on all the pipework being bonded through the boiler, because sometimes they take the boiler away and work on the pipes before fitting a new boiler.

 

[keenamateur]

Thanks for the replies

So the definitve is Wiring regs say not needed unless in bathroom etc.

Corgi say yes - are corgi wrong then? or does anyone know the reason behind their thinking?

I'm not carrying out the work just curious as I've seen it done/not done.

 

[JohnD]

Corgi are king of the boilers, I suppose they're entitled to make the rules for boiler installations.