Identifying supply type

[Richard3009]

TNS and TN-C-S can appear the same at first observation, other than opening and looking in the cutout for the amount of incoming cores and the link , how else can you tell the difference.

 

[Simonslimline]

Yes but if you are not sure you can find out by enquiry. Also instead of guessing you can do your PFC tests to work it out.

Is this a genuine concern of you'rs ?

 

[Richard3009]

No just an observation I made on a supply yesterday

 

[Simonslimline]

Fair enough.

How did you identify it in the end ?

 

[Amp David]

Know what id do if i had no instruments to test with. Probably get shot down if i decided to post it though.

Why would you have instruments though in the first place?

 

[Richard3009]

split the cutout

 

[davesparks]

Why are so many people so keen to go taking the DNO's equipment to pieces just to be able to tick a box on a cert? And you will have your tester anyway if you are doing inspection and testing!

And if you are there to do a quote then in the average 100A SP supplied domestic environment there is no difference in what we have to install and how we have to install it between the TN systems, unless you are quoting for running power outside to an outbuilding containing extraneous parts (how many actually do).

There's even a suggestion somewhere that we should consider that existing TN-S systems may be changed to TNC-S in the future (more grey area nonsense from out IET masters)

 

[Rockingit]

Was thinking exactly the same as Dave - for average everyday domestic all we need to know is TN or TT and what the Ze is. Even a Electrical Trainee can suss that one, surely?!