Recording Ze

[Piratepete]

On the EIC itself however, you will find a space for the Ze.

Where abouts? I've looked quite carefully!

 

[sparkymalarky]

Where abouts? I've looked quite carefully!

On Page 2, Section I - Nature of Supply Parameters...

 

[Piratepete]

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

Pages 98 and 99 of GN3 2012 edition and page 402 of Regs 2011 green edition

 

[sparkymalarky]

Piratepete, these pages that you have included from Pg98/99 of GN3 BS7671:2008 (2011) go along with the pages from 104&105 for an EICR(electrical installation condition report) and Pages 94&95 for an EIC (electrical installation certificate).

I think that is where you have been getting confused, hope this helps.

 

[wildgoose]

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

Zs=Ze + [R1+R2).

So Zs and Ze can't be the same can they? I'm assuming you know what R1 and R2 is all about?

 

[Piratepete]

On Page 2, Section I - Nature of Supply Parameters...

Oh, b----r! I've always used this box to enter the worst case values - ie 16kA for Ipf and either 0.35, 0.8 or 200 ohms for Ze. The actual measured values I put on the Schedule of Test Results where the boxes used to ask for Ipf and Ze at Origin. Well, I've never been picked up on this in 10 years! Hurray for NICIEC assessments!

 

[ShaunM]

Hi to get the value of Zs the formula is as follows Ze+(R1+R2) R1 being the phase conductor and R2 being the CPC

 

[ShaunM]

Ze is the recorded external impedance at the intake of the supply, Zs is the earth fault loop impedance which is the total resitance of Ze PLUS R1 and R2

 

[sparkymalarky]

Welcome to the forum, but that has clearly already been established lol.