Another bonding question..... sorry :)

[bigstevex]

When we installed our new bathroom we took the bonding off the sink and bath taps, my question is should I replace these?

OR

We had a new boiler/full central heating installed at the same time, the fitter told us we didn't need to have any of the pipes/radiators bonded as our CU has an RCD on it (think i wasn't had a bit there). Anyway, can i simply bond the flow/return pipes and the hot/cold water pipes altogether to save doing the bathroom and rads? Or was he telling the truth?

Please don't moan if I'm being totally retarded here, this bonding thing is confusing me!

 

[Electrifying]

When we installed our new bathroom we took the bonding off the sink and bath taps, my question is should I replace these?

OR

We had a new boiler/full central heating installed at the same time, the fitter told us we didn't need to have any of the pipes/radiators bonded as our CU has an RCD on it (think i wasn't had a bit there). Anyway, can i simply bond the flow/return pipes and the hot/cold water pipes altogether to save doing the bathroom and rads? Or was he telling the truth?

Please don't moan if I'm being totally retarded here, this bonding thing is confusing me!

Not quite as simple as that - but thats plumbers for you

All final circuits in the bathroom have to comply with the requirements for automatic disconnection of supply.

All final circuits in the bathroom have to have additional protection by means of a 30mA RCD.

Any extraneous-conductive parts in bathroom have to be bonded to the MET. (Main Earthing Terminal)

If the above three conditions are sattisfied in your bathroom, then no need to suplementary bond between the pipework, radiators etc.

Regardless of this, though, your incomming water/gas supplies, and any other extraneous conductive metalwork, needs to be bonded to your MET - whether you have RCD protection in your CU, or not (silly plumber)

 

[bigstevex]

Thanks for the response

So just to clarify,

the downlights are on a rcbo

and the shaver socket/underfloor heating is on the rcd side of the CU

So thats the 'final circuits' protected i presume?


Then the bonding,

The cold water pipe into the house has what looks to be a 10mm2 earth coming from it, going to somewhere near the CU. That cold water pipe then feeds the sink down stairs (bonded). It goes upstairs to the bathroom (bath then sink and finally the boiler), then the hot water pipe runs in reverse next to the cold water pipe.

So if I bond the pipes just before the bath and then just before the sink, then where the boiler is can I just bond the feed/return pipes (copper all round house) to the cold feed? Or is each rad meant to have been bonded under the floor boards? Surely bonding the feed/return pipes would 'earth' any fault?

 

[Electrifying]

Thanks for the response

So just to clarify,

the downlights are on a rcbo

and the shaver socket/underfloor heating is on the rcd side of the CU

So thats the 'final circuits' protected i presume?


Then the bonding,

The cold water pipe into the house has what looks to be a 10mm2 earth coming from it, going to somewhere near the CU. That cold water pipe then feeds the sink down stairs (bonded). It goes upstairs to the bathroom (bath then sink and finally the boiler), then the hot water pipe runs in reverse next to the cold water pipe.

So if I bond the pipes just before the bath and then just before the sink, then where the boiler is can I just bond the feed/return pipes (copper all round house) to the cold feed? Or is each rad meant to have been bonded under the floor boards? Surely bonding the feed/return pipes would 'earth' any fault?

To be honest, Steve, from what you are describing, the additional bonding that you are intending isn't necessary - there's nothing wrong with you doing it, there's just no point.

As long as you have main protective bonding conductors connected between the MET (at the CU) and your water/gas intake (where the pipe enters the building or within 600mm of the meter outlet union) and your bathroom satisfies the conditions in my other post (which you imply that it does), then no further bonding is required.

P.S. If you have a shower, that would need to be on the RCD side of the board, as well.

I'm sure someone else will correct me if I've overlooked something

 

[bigstevex]

Shower uses same pipework as hot/cold bath, its just a normal shower, not electric,

thanks for the help