Tnc-s

[ICE]

Ok, I'm leaving myself open for some serious abuse here.... I was asked a question today, who can answer it.

question: how do you identify a tncs system through testing at the consumer unit when you have no access to the incoming head? So what they are asking is how do you determine what the incoming supply is, tns or tncs

 

[spark 68]

Check the PSCC and PEFC, on a TNC-S system they will be exactly the same. (for Single phase).

On 3-phase check ZP-N and Ze again they will be substantially the same.

 

[ICE]

:hurray:

Check the PSCC and PEFC, on a TNC-S system they will be exactly the same. (for Single phase).

On 3-phase check ZP-N and Ze again they will be substantially the same.

 

[SirKit Breaker]

Nice one spark, i had forgotten that, but its obvious why.

Cheers…………..Howard

 

[SirKit Breaker]

Ok, I'm leaving myself open for some serious abuse here.... I was asked a question today, who can answer it.

question: how do you identify a tncs system through testing at the consumer unit when you have no access to the incoming head? So what they are asking is how do you determine what the incoming supply is, tns or tncs

Asking a question like that (or any other question) shouldn't leave you open to abuse. Its a fair question, and i bet there are plenty of people who didn't know.

Cheers…………Howard

 

[spark 68]

Thanks Howard.

My answer is actually badly worded, I should have said compare Ze and Z P-N for both SP and TP+N, as with all bonding connected in taking the PEFC reading, this could give a slightly higher reading compared to the PSSC in some circumstances.

I knew what I meant though, lol.

 

[Guitarist]

Ok, I'm leaving myself open for some serious abuse here.... I was asked a question today, who can answer it.

question: how do you identify a tncs system through testing at the consumer unit when you have no access to the incoming head? So what they are asking is how do you determine what the incoming supply is, tns or tncs

Never identify anything without seeing it first. If there's no access to the service head, then don't do the job.

 

[ipf]

Never identify anything without seeing it first. If there's no access to the service head, then don't do the job.

Agreed. Results should confirm what your eyes tell you.

Then again.......could be a bit of a problem if working on a final sub circuit at Heathrow airport.

 

[SPARTYKUS]

Agreed. Results should confirm what your eyes tell you.

Then again.......could be a bit of a problem if working on a final sub circuit at Heathrow airport.

Nah, make them ground the presidents plane....for the sparky :devil: