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Topic Title: Weird ELI Readings...Please Help!!!!
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Created On: 19 December 2010 11:08 AM
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 21 December 2010 10:35 AM
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AJJewsbury

Posts: 11768
Joined: 13 August 2003

The only thing I've been able to imagine so far is some deliberate impedance in R2 - perhaps some misguided attempt to avoid problems with earth loops with audio or radio equipment - and then still attempting to claim compliance with BS 7671. (A bit like IT systems, but with the impedance within the consumer's installation, rather than at the star point). It does seem a bit odd that the regs treat TN differently to TT but then (theoretically at least) allow similar loop impedances.

- Andy.
 21 December 2010 10:41 AM
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GeoffBlackwell

Posts: 3588
Joined: 18 January 2003

Given 411.4.2 (2nd paragraph) I think it unlikely that any circuit would comply with an impedance that high, or even as high as allowed by 41.5.

IMO this regulation is not at all useful - even after the proposed modifications in the DPC.

Regards

Geoff Blackwell
 21 December 2010 11:00 AM
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shaunbutler

Posts: 217
Joined: 25 July 2010

If your R1 + R2 are ok, and Ze, the the difference is between your ccts and the tails, this would be you consumer unit. Try checking the obviouse, tightening the manufactured terminals, you could also give them a ring.
IET » Wiring and the regulations » Weird ELI Readings...Please Help!!!!

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