NICEIC Certification Scheme Consumer Unit Installation Up to Scratch??? NICEIC approved Installer.

[shinypen]

Sorry got myself a bit confused there. To clarfy, my theory is it's a TNS and the label is attached to the lead sheath then has an earth running up to the earth block and then it definitely goes from there to the C/U.

Do TNC-S ever have exposed lead outer sheaths and if so would there be continuity between that outer sheath and the MET?

 

[shinypen]

No evidence no. I've asked them to send a pic of the internal but they're not up for it. Thanks everyone.

 

[westward10]

Looks like an old TN-S supply converted to TN-C-S. Where does the green/yellow from the earth block go to.

 

[PEG]

Without having a poke around,always difficult to give practical opinions...

The one definitive thing i can assure you,is placing the word "approved",at the end of anything,means squat

 

[shinypen]

Oh I see now.

Looks like an old TN-S supply converted to TN-C-S. Where does the green/yellow from the earth block go to.

Oh I see now. Thanks. The green/yellow from the earth block goes to the c/u earth met.

 

[shinypen]

Thanks everyone, and appreciate it's next to impossible to give opinions second hand with no photos.

 

[The Ghost]

In any event, lack of bonding of services is potentially dangerous and needs to be implemented a.s.a.p. It is TN-C-S. The three neutrals into one needs further investigation and appropriate action taken to rectify if needed, which I imagine it certainly will be. You seem to have proved the Zs is satisfactory so therefore will meet required disconnection times assuming you did Zs on up and down ring. You did not mention the Pfc, which might be interesting to have a stroll around to ensure equipment installed can take the fault current.

 

[shinypen]

In any event, lack of bonding of services is potentially dangerous and needs to be implemented a.s.a.p. It is TN-C-S. The three neutrals into one needs further investigation and appropriate action taken to rectify if needed, which I imagine it certainly will be. You seem to have proved the Zs is satisfactory so therefore will meet required disconnection times assuming you did Zs on up and down ring. You did not mention the Pfc, which might be interesting to have a stroll around to ensure equipment installed can take the fault current.

Cheers. I'll certainly have another look and check pfc as well.

 

[Leesparkykent]

Cheers. I'll certainly have another look and check pfc as well.

You done Ze and said it was 0.19 Ohms.. As its TN-C-S PEFC and PSCC will be the same so the calculated PFC=230V/0.19 Ohms...which is 1210A

 

[shinypen]

Sorry my mistake. The Ze was 0.3. I did a quick pefc I think it was, and it was nice and high. Could've been 1600amp.

It was my house that was 0.19Ze and that's definitely a tns.

 

[westward10]

Sorry my mistake. The Ze was 0.3. I did a quick pefc I think it was, and it was nice and high. Could've been 1600amp.

It was my house that was 0.19Ze and that's definitely a tns.

You cannot base the earthing system from a Ze

 

[shinypen]

Sorry just meant it is visually unambiguously a tns at my house. And low ze. I'm confusing the issue just ignore that!

 

[telectrix]

Off topic, Tel how are the dogs doing?

she's holding on to them. can't believe it. nesting but not dropping yet.

 

[Pete999]

she's holding on to them. can't believe it. nesting but not dropping yet.

Typical always keep you waiting, sleepless night ahead then?

 

[The Ghost]

With Amd 3 pfc is calculated as 230 x.95 (Cmin) = 218.5/0.3 = .73 Ka (pg. 127 GN3) Not that it makes much difference but it certainly would if you had 0.03 which is becoming more common. I think you need to set your loop test to high output as no trip loop test can be innacurate especially on Ze test.