New Regs and Bathroom Bonding

[Barnman]

I have read that :

"Supplementary bonding between metallic service and waste pipes and the earth connections of equipment is no longer required, provided the main bonding of services within the property is in place and the metallic pipework can be proved by testing to be continuous. This means that the need for green and yellow cables in bathrooms is unlikely to be necessary."

So what does "the main bonding of services" mean.

 

[Spark123]

Things like your water service and the gas service, however main equipotential bonding is also required to any extraneous conductive part to the building such as a metallic building structure, metallic sewer pipe etc etc etc.

 

[Barnman]

So to get this straight. The water main is plastic and all pipework is plastic apart from the short lengths to the boiler. None of this pipework needs bonding. I do not have gas only oil through a plastic pipe so this does not need bonding. If I have an electrical towel rail in the bathroom this does need bonding - which is simply running a 4mm earth wire from the rail earth to the lighting earth - as long as the rail socket is earthed. Is that it?

 

[Spark123]

Possibly, are the drains metallic? Metallic building structure?
Anything else in the bathroom which can introduce a potential (including earth potential) to the room? Electric shower? Any other circuits in the bathroom?

 

[Barnman]

I am renovating a barn and intend to get the local authority to inspect but want to make sure I understand things correctly. No shower - but if there was I would connect the shower earth to one of the other earths. This seems to make life alot simpler than having earth cable to radiators and pipes and 10mm back to the consumer unit. Life normally gets more complicated.

 

[securespark]

I have read that :

"Supplementary bonding between metallic service and waste pipes and the earth connections of equipment is no longer required, provided the main bonding of services within the property is in place and the metallic pipework can be proved by testing to be continuous. This means that the need for green and yellow cables in bathrooms is unlikely to be necessary."

So what does "the main bonding of services" mean.

Protective Equipotential Bonding in the 17th is equipotential bonding for safety. This includes (amongst others) connections between the MET and service pipes (like gas & water).

See here for abridged regulation concerning SEB in bathrooms:

//www.diynot.com/forums/viewtopic.php?t=131614


If you do do supplementary, it does not return (via cable) to the MET, only through the pipework.

 

[Taylortwocities]

Dont forget that the circuits must be RCD protected to achieve ADOS.