bonding size???incoming mains to earth block and beyond???

Postby brickiepaul » Wed Oct 03, 2007 7:37 pm

In a new build, am i right in thinking that the earth size is the following,
16mm from incoming mains to consumer unit, then 10mm to gas meter and incoming water mains, with everything else 4mm, ie cross bonding bathroom, kitchen sink, boiler etc. clarification would be most appreciated.
Regards Paul
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Postby jackhawk » Thu Oct 04, 2007 8:10 pm

Hi Paul,
Yes, as long as the supply tails are no bigger than 35mm2 then that will be fine. Remember 600mm max on consumer side of gas meter/ water meter, hard pipe, before any branches or if meters are external connect at point of entry as above.

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Postby baldelectrician » Thu Oct 04, 2007 9:56 pm

See the projects section, earth bonding. THis will link through to the IEE.

If your new build is in Scotland ... 9Mar06.pdf
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Postby sparx » Thu Oct 04, 2007 10:26 pm

Hi paul, spot on!
cross bonding can be 2.5mm2 if 'mechanically protected' but as difficult to do 4mm2 is norm. regards SPARX
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