High Ze on TNCS

[coxyboy]

I did a test on a domestic property today.
the Ze I measured was 0.60
this is above the maximum permitted that is 0.35 for a tncs system.
I coded it a c2 as the Ccu was a 17th edition dual rcd type.
do I have to notify the electrical supplier of this high reading? And have I coded it right?
any help would be very greatful. Thanks

 

[onions1066]

Yes notify the supplier, code 2 is what I would code it as. Good luck getting them out for a high ZE they don't exactly put them as an urgent job.

 

[coxyboy]

Thanks
if they won't come out what do I have to do? Is it my duty as being the last electrician on site to get this sorted ASAP ?

 

[trev]

Ask to speak to the duty engineer otherwise you'll spend an hour trying to talk technical to someone who doesn't actually give a damn.

 

[telectrix]

it needs sorting. phone DNO and ask for the duty engineer. nobody else will have a clue. they have a duty to maintain the earthing at 0.35 or less

 

[coxyboy]

Thanks I will phone them first thing morning and hopefully get them out ASAP . Thanks again for above advice

 

[bigbaddave]

I disagree, I has northern power grid out within 2 hours for high ZE on a TNCS. They treat it as an emergency call.

 

[bigbaddave]

That should I'd said last week

 

[Darkwood]

Assuming the test leads and tester are ok? Have you confirmed the result with a second tester wouldn't want to look a idiot :wink_smile:

 

[Amp David]

I disagree, I has northern power grid out within 2 hours for high ZE on a TNCS. They treat it as an emergency call.

Yeah me too! Every time i've called Electricity NW for high Ze they've always been out withing a few hours and sorted it.

 

[Flanders]

Assuming the test leads and tester are ok? Have you confirmed the result with a second tester wouldn't want to look a idiot :wink_smile:

I agree always double check you tester and leads I use a socket in my garage to double check mine if get a high reading like that.