Earth bonding to gas and water

[Carloss]

Hello,

Would be grateful for people opinions on this situation I am in....

The Client has requested a 17th edition consumer unit upgrade due to a child receiving an electric In the house. I visited the house to get an idea of what's going on etc.. the gas and water main have a 6mm earth tagged onto them. However, the client has limited funds and can only afford a fuseboard change including testing. Will take an extra day to upgrade the bonding to 10mm as laminate flooring/concrete floors are everywhere! With the supply characteristics that's present, would I be able to leave it at 6mm. Tncs system, main fuse 60a 1361. Or could I put it as a limitation on the certificate? Upgrade of equipotential bonding to water main and gas main in 10mm could not be carried out at present???

Carl

[holmslaw]

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[Carloss]

Thanks, sorry for sloppy posting, using my phone to write this!

Would it be acceptable if I carried out a continuity check on the bonding if I get readings below 0.05ohms would be acceptable? taking into consideration the type of earthing system and fuse size?

Thanks,
Carl

[holmslaw]

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[matt1e]

holmslaw wrote:

Yes you should test is as part of the cu change, but it will still be unacceptable because the conductors are too small. .

They may be ok if the system is TT

[londonboy]

The installation is TNCS.

I beleive you can verify 6mm by using adabatic equation.

[holmslaw]

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[matt1e]

holmslaw wrote:

matt1e wrote: holmslaw wrote: Yes you should test is as part of the cu change, but it will still be unacceptable because the conductors are too small. . They may be ok if the system is TT Carloss wrote: Tncs system,

allright I'll go and clean me specs

[holmslaw]

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[ebee]

TNC-S (PME) requires 10mm min (even then your supplier might require more)