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Topic Title: Bonding Upgrade
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Created On: 16 November 2009 06:53 PM
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 16 November 2009 06:53 PM
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1652

Posts: 348
Joined: 22 March 2007

When up grading bonding on a PME domestic property to 16mm main and 10mm sup bond. Do you remove the old 6mm main and sup bond or leave it in place i.e. in parallel.

When I say leave in place I mean don't touch it or cut it out.

Regards.
 16 November 2009 10:09 PM
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kermit1202

Posts: 114
Joined: 18 November 2007

i would take it out:

1) to aviod confusion to anyone who did work after me

2) there is not always enough room in a CU for 4 Bonding cables and 2 earths.

3) leaving it in will not make the installation any safer.
 16 November 2009 10:37 PM
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daveparry1

Posts: 5887
Joined: 04 July 2007

Something doesn't sound right there 1652, do you mean 16mm main earth and 10mm main bonding? Supplementary bonding would normally be 4 or 6 mm.
 16 November 2009 10:48 PM
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Angram

Posts: 548
Joined: 23 March 2009

Its amazing how often old bonding wire turns out to be flapping
about in free space. Under equipment racks for telecoms and
in building voids. I used to connect them up; " every little helps"
but I now I have stopped.
 17 November 2009 08:44 AM
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1652

Posts: 348
Joined: 22 March 2007

Sorry Dave P.

16mm main earthing conductor and 10mm main equipotential bonding is what I meant.

As for the room in the CU:

Fit a new MET (4 way) in the Meter box to bond the header in 16mm and also up to the CU in 16mm. H2O and Gas in 10mm to the new MET.

However left the old 6mm H2O and Gas bonds in the CU. Don't want to leave old bonding cables loose in the back of the CU (cant get in very far to cut them off) also the gas bond in the gas wall box goes in to the cavity via the gas putty seal don't want to mess with the putty seal.
 17 November 2009 10:06 PM
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AJJewsbury

Posts: 10964
Joined: 13 August 2003

the gas bond in the gas wall box goes in to the cavity via the gas putty seal

Isn't that contrary to the gas regs?

- Andy.
 18 November 2009 12:03 AM
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antric2

Posts: 1034
Joined: 20 October 2006

Evening,
I might be missing something from the red book but my understanding is that, if you do any work on an installation that is PME then the main earth does not require upgrade to 16mm, only main protective bonding to gas and water to 10mm is required and also supp bonding if work is done in a special location unless all circuits in the sp location are RCD protected plus few other criteria. etc

It is would be good practice and credit to you for doing it, but , to upgrade earth to 16mm but is not a requirement if cu is not to be changed, or existing cable is in satisfactory condition.Some 3036 boxes wont take a 16mm earth anyway if I am not mistaken.
Regards
Antric
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