I'm Decorating for a bloke who had his house rewired recently. He was moaning that the sparky messed his kitchen up when replacing 6mm earth with 10mm. His question; The 10mm bonding was run into the back of a socket which only carries 2.5mm earth?. Erm is this right??
Earth Bonding
- Thread starter trying
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Well that might depend what was going on. There is no requirement to earth socket boxes using 10mm cable. Presumably he was trying to do something else. Using 10mm to bond the water and gas supplies would make sense. There is no requirement for supplementary bonding in kitchens, but if this is what he was doing then leaving 6mm in place would have been ok. 4mm is ok for supplementary bonding.
K
kai
I thought if there was an immersion heater under the sink, in one of those under draining board type units, then there must be cross bonding of all sink and it's metalwork back to the main fusebox earth - i.e. where water and electric mix. Am I still right regarding this?
No.
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Hmm! This bloke said 'the sparky changed 6mm supplementry bonding in kitchen to 10mm and ran it into the earth at a socket. Really, the question was whats the point of changing bonding to 10mm when its connected to 2.5mm ?
I'll stick to decoratin lol.
I'll stick to decoratin lol.
6mm²/10mm² was a pointless change, and supplementary bonding is not required in a kitchen anyway, but if you have it, the whole point of it is that it connects to the cpc of circuits supplying the room!trying said:
Good idea...
Are you sure it supplementary bonding ? and that the sparky wasn't installing a 10mm equipotential conductor for a PME?
As for connecting it into a socket ? who knows
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It's not my kitchen! The bloke I was working for said there was an existing 6mm earthing cable round pipes etc which lead into a socket under units,this was put in 2 yrs ago when he had a new kitchen. He then had house rewired recently and sparky changed that bonding to 10mm.
His meter and cu is in garage (20mt away) (coo wish i hadnt asked lol)
His new cu earth bond (25mm, well its thick anyway) is connected to pipe from his gas meter in garage. (and water pipe)
SOO seems that earth starts off as 10 mmm in kitchen then going into socket goes down to 2.5mm.
No pme, all pipes/ embedded in solid floors.
I was just curious (like him) to know why they bothered to change from 6mm to 10 mm when it goes into 2.5mm.
As for connecting it into a socket ? who knows
[/quote]It's not my kitchen! The bloke I was working for said there was an existing 6mm earthing cable round pipes etc which lead into a socket under units,this was put in 2 yrs ago when he had a new kitchen. He then had house rewired recently and sparky changed that bonding to 10mm.
His meter and cu is in garage (20mt away) (coo wish i hadnt asked lol)
His new cu earth bond (25mm, well its thick anyway) is connected to pipe from his gas meter in garage. (and water pipe)
SOO seems that earth starts off as 10 mmm in kitchen then going into socket goes down to 2.5mm.
No pme, all pipes/ embedded in solid floors.
I was just curious (like him) to know why they bothered to change from 6mm to 10 mm when it goes into 2.5mm.
Either we have not got all the facts straight yet, or he had his regulations mixed up, or he liked the idea of being paid to swap wires about.
It does make sense to use a thicker wire for supplementary bonding than for 'earthing'. The idea with supplementary bonding is to link together everything in a particular location which could be at a different voltage. So that if one set of pipes somehow got to be live, it would not be possible to grab that pipe in one hand and a different earthed pipe in another hand. Since as they were all already connected with a nice chunky wire there could not be any voltage between them. So long as they are all at the same voltage, you are safe.
However, the risk from this sort of thing is not considered to be seriously dangerous unless you are wet. Kitchens are not normally full of steam, condensation and wet naked people so it is not considered necessary to supp bond. Not my kitchen, anyway.
It does make sense to use a thicker wire for supplementary bonding than for 'earthing'. The idea with supplementary bonding is to link together everything in a particular location which could be at a different voltage. So that if one set of pipes somehow got to be live, it would not be possible to grab that pipe in one hand and a different earthed pipe in another hand. Since as they were all already connected with a nice chunky wire there could not be any voltage between them. So long as they are all at the same voltage, you are safe.
However, the risk from this sort of thing is not considered to be seriously dangerous unless you are wet. Kitchens are not normally full of steam, condensation and wet naked people so it is not considered necessary to supp bond. Not my kitchen, anyway.
Huh! - Shan't be wanting to go to any parties at your house then.....Damocles said:
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