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Earth bonding to gas and water


 
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Carloss

from United Kingdom

Joined: 31 Mar 2004
Posts: 168
Location: United Kingdom

PostPosted: Thu May 12, 2011 9:53 am Reply with quote

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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holmslaw

from Vanuatu

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PostPosted: Thu May 12, 2011 10:02 am Reply with quote

..


Last edited by holmslaw on Mon Apr 09, 2012 9:58 pm, edited 1 time in total
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Carloss

from United Kingdom

Joined: 31 Mar 2004
Posts: 168
Location: United Kingdom

PostPosted: Thu May 12, 2011 10:06 am Reply with quote

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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holmslaw

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PostPosted: Thu May 12, 2011 10:11 am Reply with quote

..


Last edited by holmslaw on Mon Apr 09, 2012 9:59 pm, edited 1 time in total
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matt1e

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PostPosted: Thu May 12, 2011 5:26 pm Reply with quote

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
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londonboy

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PostPosted: Thu May 12, 2011 5:55 pm Reply with quote

The installation is TNCS.

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

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PostPosted: Thu May 12, 2011 5:55 pm Reply with quote

..


Last edited by holmslaw on Mon Apr 09, 2012 9:59 pm, edited 1 time in total
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matt1e

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PostPosted: Thu May 12, 2011 5:58 pm Reply with quote

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,


icon_smile.gif


icon_redface.gif

allright I'll go and clean me specs icon_lol.gif
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holmslaw

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PostPosted: Thu May 12, 2011 6:01 pm Reply with quote

..


Last edited by holmslaw on Mon Apr 09, 2012 10:00 pm, edited 1 time in total
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ebee

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PostPosted: Fri May 13, 2011 8:39 am Reply with quote

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