Recording Ze

[Piratepete]

Hi
I note that on the new 'Generic Scedule of Test Results' where there use to be a requirement to record 'Ze at origin' and 'PFC' (at origin), it is now 'Zs at DB' and 'Ipf at DB'.

Is there now no requirement to record Ze at Origin? I note that there is still a requirement to test Ze.

Pete

 

[Engineer54]

What ''Generic Scedule'' are you referring too?? There is always a requirment to test AND record Ze values!!

 

[sparkymalarky]

Actually lads there are two ways to obtaining Ze and Ipf values, by enquiry or measurement!

 

[i=p/u]

ze of board your working at which is zs of of the fuse before, ze zs all the same

 

[sparkymalarky]

No, Ze is the external earth fault loop impedance external to the installation. I know guidance note 3 refers to the Zs measured at a distribution board as Zdb but I choose not to.

 

[Engineer54]

ze of board your working at which is zs of of the fuse before, ze zs all the same

Oh Dear, Oh Dear, Oh Dear!! lol!!

 

[i=p/u]

and yes only 1 ze of installation but its when to apply ze zs or zdb, least i know what im on about lol

 

[Engineer54]

and yes only 1 ze of installation but its when to apply ze zs or zdb, least i know what im on about lol

Which is more than we do then ...lol!! Cause only Zs, Zdb applies after the main incoming supply point!!

 

[i=p/u]

in the book pointd out above it does use zs on test sheets as ze..

i know your worth double what i get payed e54, i know but can only say what i know:yes:

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or seen

 

[Engineer54]

in the book pointd out above it does use zs on test sheets as ze..

i know your worth double what i get payed e54, i know but can only say what i know:yes:

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or seen

Then something is very wrong in that book!! Ze and Zs, are as i said earlier, ...Very different animals!! lol!!

 

[sparkymalarky]

What book is this? they are completely different!

 

[i=p/u]

test sheets should i say then... but struggling to find where now, maybe im yapping out my beeeeeep!

 

[sparkymalarky]

I found it! Page 93 of GN3 BS7671:2008 (without amendment). That sort ye out i=p/u lol

The schedule of test results in this version of GN3 does ask for Ze at origin. Stupid. New version is far better.

 

[Guitarist]

On the generic schedule of test results it does indeed say Zs at DB. This is exactly that... a generic term for the DB you are working on which may or may not be the one at the incomer. On the EIC itself however, you will find a space for the Ze.

 

[sparkymalarky]

I find this to be standard though, as all I work is EICR's on factories, large government offices, schools etc. I rarely will be completing an EICR with only one Distribution board. Sometimes its hard to get your point across on the old interwebatron.