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Topic Title: I&T and Certifying a service alteration
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Created On: 10 October 2012 09:01 PM
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 10 October 2012 09:01 PM
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davebp

Posts: 115
Joined: 16 April 2009

Evening,

Next week I shall be having the service head and meter relocated on my house which I have recently re-wired. - The original job has been certified and notified.

It will mean installing new tails, and providing a switch fuse to provide protection for the tails as they will exceed 3m.

In terms of testing and certifying this, am I correct in thinking that I will need to re-test all final circuits as well as the new distribution circuit, and issue an EIC with a full schedule of test results? - Obviously Ze and therefore circuits' Zs will almost certainly change, if only fractionally.

Also, in 'extent of installation covered by this report' what kind of thing should I be writing to make it clear that it's just the distribution to the CU that is being installed?

Thanks as ever,

Dave.
 10 October 2012 09:21 PM
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tillie

Posts: 786
Joined: 03 May 2006

Hi Dave , not sure if you would need to retest the whole installation.

The R1+ R2 for the circuits will still be the same and insulation resistance will be unaltered.

You will need to test the submain so I cannot see any reason why you cannot just add the additional R1 +R2 of the submain onto the circuits.

I would personally Zs test all sockets.

In the extent of installation box you could write " installation of new submain to consumer unit ".

Regards
 10 October 2012 09:40 PM
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slittle

Posts: 3484
Joined: 22 November 2007

If it's your own place so you know no one has "fiddled" since the last set of results. I'd do a cert for the sub-main and use the sub-main Zs as the starting point for a replacement cert for the house (if it's changed enough to worry about)

stu
 11 October 2012 08:20 PM
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davebp

Posts: 115
Joined: 16 April 2009

Cheers guys,

I was hoping someone would suggest it wasn't neccessary to re-test the entire thing,

I think you're right, - as I did the original cert, I will be able to re-certify based on the original readings.
Thanks,

Dave
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