Bonding question

A friend of mine wants to bring the electrics on a property of his up to scratch, and also get some storage heaters fitted, and got the local supplier in to give him a quote - as he lives some miles away I agreed to have the key and let them in. I was surprised by one or two things that they said about his electrics, and by the quote, so I'd be grateful for the views of more knowledgeable people here. The property has just had a new kitchen fitted by a specialist company and they, as would be expected, supplementary bonded the incoming water pipes and also the sink top and draining board - using 6mm cable to do it. The suppliers electrician said that they shouldn't have bonded the draining board, which seemed pretty strange to me. Also, as I noticed that the property is PME protected, I thought that all the bonding should be 10mm - he said that 6mm was ok. The existing consumer unit is the wired fuse type which my friend wants replaced so that the property benefits from RCD protection - as he wants to let the place. I was surprised when the Board's electrician said that, although it was a good idea to replace the CU, it wasn't absolutely necessary. As for the quote: for 3 storage heaters - 12, 18 and 24 - replacing the consumer unit and fitting a second (3 ways) for the Economy 7 supply and tidying up the bonding in the bathroom and kitchen, 2,617 - which I thought was very steep. Any comments?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
What is bonding?
|A friend of mine wants to bring the electrics on a property of his up to | scratch, and also get some storage heaters fitted, and got the local | supplier in to give him a quote - as he lives some miles away I agreed to | have the key and let them in. I was surprised by one or two things that they | said about his electrics, and by the quote, so I'd be grateful for the views | of more knowledgeable people here. | The property has just had a new kitchen fitted by a specialist company and | they, as would be expected, supplementary bonded the incoming water pipes | and also the sink top and draining board - using 6mm cable to do it. The | suppliers electrician said that they shouldn't have bonded the draining | board, which seemed pretty strange to me. Also, as I noticed that the | property is PME protected, I thought that all the bonding should be 10mm - | he said that 6mm was ok. | The existing consumer unit is the wired fuse type which my friend wants | replaced so that the property benefits from RCD protection - as he wants to | let the place. I was surprised when the Board's electrician said that, | although it was a good idea to replace the CU, it wasn't absolutely | necessary. | As for the quote: for 3 storage heaters - 12, 18 and 24 - replacing the | consumer unit and fitting a second (3 ways) for the Economy 7 supply and | tidying up the bonding in the bathroom and kitchen, 2,617 - which I thought | was very steep. | Any comments? | |
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Many things, I suppose, but in this case I meant earth bonding!

to
and
pipes
10mm -

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

IEE OSG page 26. "There is no specific requirement to bond kitchen pipe, sinks or draining boards."
Even if there was a requirement 4mm would probably be OK as used in a bathroom.
Also, as I noticed that the

The main incoming water service should be main bonded back to the CU. This usually requires 10mm cable .

For a PME system then only sockets likely to power portable outdoor appliances need to be protected by an RCD.

Shop around.
Adam
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

to
and
pipes
10mm -

Thanks Adam, your help is appreciated. One more question, if you don't mind, in your experience are Economy 7 meters usually fitted free by the supply companies?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I have no idea. Try a search on http://www.uswitch.com/ It may help.
Adam
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.