What earth system is this?? Pics attached

[srl-8]

Morning,

I have attached a couple of pic's for you all to have a look at. I am finding it hard to know wether this is a TN-C-S or a TN-S.

Can anyone confirm. My thought is it is TN-C-S...

Thanks in advance. (still learning...~)

Srl-8

 

[malcolmsanford]

It is very hard to tell what you have there to be honest as you may find that the incomer cable is carrying an earth core with it.

There are several ways to check.

1. Call the DNO, this could be a fruitless exercise as the chances of you finding anyone to talk to that knows what your talking about is slim, but worth a try.

2. Take a Ze reading, if it's anything over 0.20 then chances are it is TN-S, but not always, but it can give you a guide.

3. Which will most likely be the best way to check is do a PSCC and PEFC test, if they are very close to same then it is TNC-S, if they are quite different then TN-S

My personal guess without doing the PSCC and PEFC test is TN-S just due to the age of the head.

 

[srl-8]

Thanks for the responce. I know how to carry out a PFC test, but not the other two you have mentioned.


PSCC and PEFC ?

 

[malcolmsanford]

Perspective Short Circuit Current taken between LIVES ie LINE/NEUTRAL

Perspective Earth Fault Current taken between LINE/EARTH

 

[Geordie Spark]

I've never heard of Perspective Earth Fault Current, so I Googled it & this was the result: Did you mean: Prospective Earth Fault Current

 

[malcolmsanford]

I did I think I'm a little dyslexic with words like that as and has and whether are others.

It is indeed Prospective and not perspective


Cheers Geordie, though getting English lessons from a Geordie i'll never live it down

 

[Geordie Spark]

I did I think I'm a little dyslexic with words like that as and has and whether are others.

It is indeed Prospective and not perspective


Cheers Geordie, though getting English lessons from a Geordie i'll never live it down

Wheyayeyerbuggerman!! Broons aall roond an' divven't drop yer dottles on th' proggy mat !!

 

[ConSupport]

Cheers Geordie, though getting English lessons from a Geordie i'll never live it down

Lol. Also loving your signature - Welcome to the internet, where women are men, men are women and underage girls are hairy assed policemen.

 

[mechelec]

it looks to me like an old cutout so I wonder if it was originally TT (no DNO earth supplied) and someone has done a DIY PME making it TN-C-S

 

[oldtimer]

The neutral side does not appear to have a seal on it so take the cover off a see if it is a common connection or 2 seperate connections

 

[cdavies33]

Thats a TN-C-S everyday of the week

 

[Monkey]

:tounge_smile:Be sure bud but take a ZS reading first to be happy there is one

but if you are not sure dont worry get them in its a free service and its there issue depends is there any out buildings on the same supply


get them or remove the cover and a totall guess would you get continuity across them


but some one will tell us off sorry


good luck:tounge_smile:

 

[SPARTYKUS]

Thanks for the responce. I know how to carry out a PFC test, but not the other two you have mentioned.


PSCC and PEFC ?

Hi srl-8

...if you're not sure what to do with these (PSCC & PEFC), get a mate in to show you, its not a test to be guessing with !

Interesting piccys, nice post.

 

[Mr Mark Sparks]

as said before looks like a self pme to me

 

[Engineer54]

That's a PME connection. You can clearly see the the neutral concentric part of the cable being taken to the neutral block. The only reason you can see this, is because there is no cable sealing chamber to this cut out arrangement.


That is Not a sheath earth, coming off the cable, look at it more carefully, and you can see the concentric arrangement.