High Ze on a TNCS system

[james king]

paper work !

il give him bout 4 testing certs

invoices i hav gave to clients

and some quotation i have done thing is i have never done a quote all my clients just said they want me any way. have not done one in 2years. just give ruff estimate and thy say ok kl, shw them a few figuers and away i go what other paperwork will i need

 

[VOLTMAN]

he asked me for pubic liability ins and company health and safety policy .meter calibration certs etc took about half a day

 

[james king]

i got calibration certs ect the women said i can have insurance on the eassessment day? health a nd safty? what shel i do for that ? im going to fail i no it lo


how do i start a thread i cant seem to do it ?????????l

 

[VOLTMAN]

youll be ok who are you goin with ? oh and remember always replace cu cover when ever you leave it to do tests

 

[james king]

ye isolate cu test incomer L and N for voltage make sure dead. re test ur voltage on a volatage detector carry out visual inspection , then dead teast r1 r2 and IR then i would carry out a ze test with dissconected earth then a zs test with all eartin back on and CU live. then rcd test. say i do a r1 r2 test and connect at cu then go off to test the last point shel i put cover back on even thought its dead? im going with napit! what r they like?

 

[VOLTMAN]

yes i would prove dead then lock off make sure covers on when you leave it. heard good things about napitt electricians guide to building regs is a good book got loads of info in there

 

[james king]

well looks like i will be going shopping monday morn pop to wholesales then go water stones lol as got a massive cricket shed to rewire. thansk for the help voltman and lenny

o yea and i have not got a lock off kit or voltage proving unit ? shel i get one i no thy r exensive for what thy r!! if not how should i prove live amd dead properly ????

 

[Guest123]

how do i start a thread i cant seem to do it ?????????l

Click on the forum you want to start a thread in i.e inspection & testing, commercial & industrial etc. At the top there is a button "NEW THREAD", click on it and away you go.

 

[trebor]

Whilst doing a Periodic Inspection on a premises that had a TNCS system i got a reading of
0.68 at the M.E.T that was four inches away.... the link between the head & M.E.T was a 16mm2 Main Earth

due to the limits being 0.35 on a TNCS system what actions should be taken... should there be a increase in the main earth to a 25mm2
plus as i always asked questions alot when i was a boy,,, why if in a TNS system 0.8 is the max then this situation would of being acceptable..

question 3 being then if all circuits still fall inside the max earth loops for the mcbs then is there a problem ... or am i from another planet ? thanku if anyone has any thoughts on this

Re high TNCS, you could try the Ze test on the neutral incomer (PEN conductor) to the main switch with the neutral disconnected and the installation islolated, this may useful for the dno as a good reading on the neutral will point to a connection problem within the service head, on the older heads there is a seperate link to be closed between neutral and earth terminals, its possible this could be loose