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Topic Title: One for UKPN perhaps
Topic Summary: Where's my earth gone?
Created On: 04 December 2012 07:11 PM
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 04 December 2012 07:11 PM
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Grumpy

Posts: 461
Joined: 09 January 2009

CU change. TNS. Went last Thursday for a few prelim checks, Ze 0.77. Changed board today, checked Ze 866! All credit to SSE, out they came and PME'd it but where did my 865.23 ohms come from?!
 04 December 2012 07:19 PM
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daveparry1

Posts: 6377
Joined: 04 July 2007

Maybe you had some bonding connected when you got 0.77 Grumpy? easily done,

Dave.
 04 December 2012 07:36 PM
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JonSteward

Posts: 589
Joined: 04 December 2007

Or even a buried MICC supplying a garage!
My 25 ohms soom became well over 200 when garage was disconnected.
 04 December 2012 07:43 PM
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Grumpy

Posts: 461
Joined: 09 January 2009

No, no no, I'm not quite as green as I'm cabbage looking although my lovely often likens me to a brassica. 14.4 ohms with bonding connected. The very nice SSE man, who incidentally scabbed two lengths of 16mm off me (aren't they supplied with this?) suggested that the lead joint had failed . . . . .
He also said that it is now quite acceptable for the likes of us to cut the seals in order to safely change a CU as long as we phone them to ask for the seals to be reinstated. Has anyone else heard of this? Fortunately, up to now, the seal fairy has always smiled on me.
 04 December 2012 08:19 PM
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sparkiemike

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 04 December 2012 08:26 PM
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DOUGIE1000

Posts: 4187
Joined: 13 August 2005

hope your not leaving the 900ohms ze?

-------------------------
Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 04 December 2012 08:28 PM
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OMS

Posts: 19900
Joined: 23 March 2004

Originally posted by: DOUGIE1000

hope your not leaving the 900ohms ze?


I guess not

All credit to SSE, out they came and PME'd




OMS

-------------------------
Failure is always an option
 05 December 2012 08:51 PM
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UKPN

Posts: 548
Joined: 17 January 2012

---did our poster do a correct external loop test, ie without
internal earthing connected? if not could he be actually testing
L+NE to get that kind of "loop," then again water main earth?

high loops of are old electricity board "TT" systems which
lay in the ground.

the sheaths normally test out at 20 ohms up and as sse have done here,
PME the head.

Regards.
 05 December 2012 09:16 PM
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Grumpy

Posts: 461
Joined: 09 January 2009

Thanks Sparkiemike I've saved that and all credit to SSE for that blast of common sense.
Yes, UKPN, I think our poster did do a correct external loop test. His wife tells me that he has been on a course and done exams and everything. Even if our poster is a complete ***** the very nice man from SSE couldn't get a reading on his meter because it was so high. Fortunately our poster has a Megger which records very high loops (or convincingly makes them up).
I have to confess that I have had more than a little difficulty in understanding your post, which is a shame as I thought you would be ideally placed to throw a little light on the issue. In fact I am beginning to suspect that English is not your first language and that you are using an internet based translation program. No offence intended.
Levity aside, had I not had the misfortune to be poking around this property then the occupants would be living with a Ze of 886 ohms. How does this come about and how common is it?
Edit. I didn't realise that tssoer would be edited. Sorry.
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