Earth bonding to gas and water

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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
 
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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
 
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The installation is TNCS.

I beleive you can verify 6mm by using adabatic equation.
 
TNC-S (PME) requires 10mm min (even then your supplier might require more)
 

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