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Topic Title: bonding house but working in outhouse?
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Created On: 23 September 2013 09:04 PM
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 23 September 2013 09:04 PM
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Grandfortune

Posts: 348
Joined: 10 April 2007

Hi all,

went to see a job today, garage 3 mtrs from house with main cutout in it.

16.0mm cable feeding house.

they are changing the detached garage to a small gym room so want some sockets and lights in.

Question is do i still need to upgrade the bonding at the house as i assume its 6.0mm or less ,( lady wasnt in so could not access, i could see the board 12 way crabtree with 100A main sw, no sign of RCD).

Cheers Grand
 23 September 2013 09:48 PM
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michaelbrett

Posts: 930
Joined: 28 December 2005

TNS or TN-C-S supply?

Regards

Mike
 23 September 2013 10:12 PM
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Grandfortune

Posts: 348
Joined: 10 April 2007

TNS
 23 September 2013 10:51 PM
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UKPN

Posts: 468
Joined: 17 January 2012

upgrading bonding is only a requirement on a PME system,
and even then only if 50% or more of the installation is added,
which is not the case here.

the wiring "regulations/requirements have no legal status on
bonding.

Regards
 24 September 2013 12:01 AM
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AJJewsbury

Posts: 11299
Joined: 13 August 2003

Question is do i still need to upgrade the bonding at the house as i assume its 6.0mm or less

1. Assume nothing!

2. The outbuilding should have its own "equipotential zone" - so any deficiency in the main house's bonding shouldn't undermine the safety of your additions/alterations in the outbuilding - so I'd say it's not necessary to upgrade the house bonding to comply with the letter of BS 7671. Certainly a good idea to check and advise the customer, even make a note on the certificate in the observations on the existing installation, but not a barrier of itself.

the wiring "regulations/requirements have no legal status on
bonding.

I'm not sure that DNOs' internal policies has any legal status either (beyond civil contract with the customer)?

- Andy.
 24 September 2013 01:09 PM
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Grandfortune

Posts: 348
Joined: 10 April 2007

thanks guys
 24 September 2013 05:50 PM
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daveparry1

Posts: 6107
Joined: 04 July 2007

BS 7671 doesn't have legal status either does it Andy!

Dave.
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