16th edition, plastic plumbing and bonding.

[TicklyT]

I'm putting a new bath in what was a shower wet room.

The house is wired to the 16th edition.

All the pipework is plastic (in fact, the only metal in the whole room is two tap heads, the plughole and a couple of robe hooks).

The lighting and extractor are protected by a 30 mA RCD.

Is there any need to add any new supplementary bonding?

 

[ricicle]

If your Main Protective Bonds are correctly sized and in place then the bathroom can be considered to satisfy the requirements of the 17th edition so no supplementary bonding should be required.

 

[PrenticeBoyofDerry]

plastic pipes don't need to be bonded, if supplying water to radiators, baths, sinks etc....
Although you do have metal taps and plug holes, it will not cause a risk.

However Electric Showers supplied by plastic pipes should be bonded.

 

[ricicle]

However Electric Showers supplied by plastic pipes should be bonded.

Where and to what ?

 

[PrenticeBoyofDerry]

http://www.plasticpipesgroup.com/pdfs/earthbonding.pdf

 

[Spark123]

However Electric Showers supplied by plastic pipes should be bonded.

They won't need supplementary bonding if all circuits in the room are supplied by 30mA RCDs.
They do however need to be connected to the MET by the circuit protective conductor.

 

[ericmark]

http://www.plasticpipesgroup.com/pdfs/earthbonding.pdf

The full article Earthing plastic pipes, to bond or not is dated 1999 and so even before the BS7671:2001 came out and if you read the original rather than the copy from hepworthplumbing which it's self was copied from wiring matters it does explain better.

supplementary protective bonding conductors (where required) do not need to return to the consumer unit (see fig2.1 BS7671:2008).

I have questioned many times the connecting of large supply earths with small supply earths because of fire risk should an earth become disconnected and an earth fault should occur. However with the use of RCD protection the fire risk is no longer present so not longer a problem.

 

[PrenticeBoyofDerry]

but are RCDs not an additional protection?

 

[Spark123]

It depends on supply type as to wether you class RCDs as additional protection.
The 17th edn regulations do allow the ommision of supplementary bonding in bathrooms under certain conditions. One of these conditions is all circuits of the location are protected by an RCD (30mA max).
//www.diynot.com/wiki/electrics:supbond17th

 

[PrenticeBoyofDerry]

are you sure about that? is that not part of a number of conditions?