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Topic Title: Origin for EIC purporses
Topic Summary: Just a thought
Created On: 18 March 2013 12:39 PM
Status: Post and Reply
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 18 March 2013 12:39 PM
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In a large multi tenanted individually metered commercial building where there are substantial rising mains 1200/2000A supplied from several private HV Tx, could the origin for the purposes of the EIC be the tap off on said rising main?

Is this actually any different to a street full of singly story offices supplied by a single Tx the equivalent "rising main" being the service cable?

So often in these places access to the true origin is near impossible to access, and getting the details is like pulling teeth!



Only a mediocre person is always at their best
 18 March 2013 12:53 PM
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Depends on how you define "installation" Martyn.

There are some aspects that you'll have to get access to in theory - earthing arrangements and equipotential bonding being a few as is mention of private HV transformers - I guess that's the drawback with a one size fits all form.

In practice, though - using the tap-off as the "origin" is quite normal - but that's only done by rough a***d contractors who don't comply with BS 7671.

You'll have all the information regarding the installation origin provided by the designer as 610.2 of course - if that's the tap off then so be it



Let the wind blow you, across a big floor.
 18 March 2013 01:33 PM
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Did an install at Salford Uni on one of the many buildings on the campus. The Tx origin was in another building via a section bd and sub main, photo copied the original EIC from the uni estates department and put in with my bits of paper
Only tested my bit used previous test results to verify to the origin
Job done.

MrP Sand storm here
 18 March 2013 04:31 PM
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I would say that the meter is the origin.

Just a quick question. If I'm testing flats, I use the Ryefield fuse as the OPD and not the cut out fuse. Is this correct?

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