house earthing system

[lizzieg]

evening all

have been doing earthing systems at college, so wandered down the cellar of the house jack renovated ( where I have the misfortune to live!!), to identify which system the house has.
Main earthing conductor is connected to a clamp where supply comes into the house, TN-S if I am not mistaken.
The main earthing conductor then goes into the CU and is terminated in the Neutral block.
Can someone please explain to me WHY..........

thanks in anticipation........meanwhile back to the algebra....LOL

 

[Spark123]

It shouldn't be terminated in the neutral block, where do all the CPCs connect to? Any chance of a photo?

 

[lizzieg]

All the rest of the cpcs go into the cpc block

 

[Lectrician]

A photo of this would be good!

It isn't one of these CU's that have the neutral and earth bar sharing a common fixing, looking as if they are connected??

Sorry if thats a stupid thing to ask

 

[lizzieg]

have asked admin to post photo.......no neutral and earth bars are quite far apart...ho hum

 

[Lectrician]

You can post a photo your self - upload it to this website:

http://imagehost.darkernet.co.uk/index.php

Make it smaller if required, less than 100k


Then, copy the link the site gives you (left mouse click, copy).

Paste it into your post like this:

 

[lizzieg]

here goes

.

 

[lizzieg]

please note I am responsible for none of that mess........

 

[JohnD]

Let me make a few wild guesses:

1) Stupid mistake
2) Couldn't fit it in the earthing block and found somewhere else it would fit
3) trying to invent his own way of making a TN-S-C (!) system.

 

[lizzieg]

[quote="


3) trying to invent his own way of making a TN-S-C (!) system.[/quote]

I was wondering that, thought college was not telling the full story again.......LOL

 

[Spark123]

Joking aside, this is obviously wrong, the CPCs may not be connected to earth or connected via a main equipotential conductor to a neighbouring property. IMO this requires immediate remedial attention, my advice as if this is done wrong it can be deadly is to have a qualified electrician test the installation (PIR).

 

[JohnD]

the CPCs may not be connected to earth or connected via a main equipotential conductor to a neighbouring property.

didn't quite follow that. Did you mean what it says?

 

[Spark123]

1) The CPCs may either not be earthed, or
2) The CPCs may be connected to earth via the block, the main equipotential bonding conductor to say a metal water/gas main, through the pipework to another property and through their main eq bonding conductor to their earth terminal.
In either case, this is bad and requires immediate remedial action.

 

[plugwash]

Move the earth to the earth block ASAP

however i agree that the whole install needs a thourough inspection and test. once you see one screwup like this its a good indication that there are likely to be more.

 

[Qedelec]

Get that Main Earthing Conductor in the earth block without delay. Looks like you have a spare hole at the bottom of the earth block.
I could not believe anyone could be that stupid.

Looks to me like you will have some usefull work to practice on.

5 fuses, can't be sure but it looks like some of those need attention.
No.4 looks like a 1.0mm cable but has a 15A fuse
What does it feed?