High integrity earthing

[333rocky333]

543.7.1.3 (iii) para 2 (in the DPC at least)

Also I would draw to your attention the last sentence in that paragraph.

what is the logical explanation for the possible existence of yet another individual protective conductor formed by the protective sheath, armour or wire braid of the cable? Surely it can't mean that the conductor in the cable is one cpc, and the armour etc is the 2nd?

Would that then mean a RADIAL socket wired in 4mm swa,with both ends glanded properly, would automatically become a high integrity socket,I would suppose the back box socket link would have to go in a seperate earth terminal also.

I agree with ban, although two wires leave the mcb, after the first socket each way, where would the 1st and 2nd conductor end, I would say it is one conductor, any volunteers hold one end while someone meggers the other.

With a ring, rather than saying it is one conductor,I would say there was two current paths and in the event of one failing, there would still be the second path for safety.
Although that conductor is 1.5mm, you have effectively now got 3mm of cable at the socket.
With high int, if one wire came adrift that 3mm would reduce to 1.5 mm.

And by sharing the current path each way, the cable size for the live conductors can be reduced, the load on each leg of the ring, as we all know varies , dependant on where on the ring it is applied.

By loading near the centre, the cable is generally ok, as the ring would then be acting LIKE two cables in parrelel, so each current path would be balanced.
IMO
One socket, two cables from source is two cables in parallel = 2 cpc conductors
More than one socket , two cables from one source is a Ring= 1 cpc conductor

 

[tim west]

Its a loop not a circle, loop in loop out..........

 

[ban-all-sheds]

OK - draw me a loop then, and show which is individual cpc #1 and which is individual cpc #2....

 

[tim west]

Ban perhaps you are thinking of what is termed a radial circuit which has one wire of each L(Live) N(Neutral) E(Earth) whereas a RFC has two of each at each socket.

Although I dont suggest you attempt it yourself but if you have a friend whose an electrician get him to remove a socket for you so you can see how an RFC is wired.

 

[SeanT]

Ban perhaps you are thinking of what is termed a radial circuit which has one wire of each L(Live) N(Neutral) E(Earth) whereas a RFC has two of each at each socket.

Although I dont suggest you attempt it yourself but if you have a friend whose an electrician get him to remove a socket for you so you can see how an RFC is wired.

*is trying not to **** himself laughing at this*

 

[stargazer]

Although I dont suggest you attempt it yourself but if you have a friend whose an electrician get him to remove a socket for you so you can see how an RFC is wired.

I’ve always wondered how RFCs were wired.
Tim, how much would you charge to come round my gaff and show me?
If you’re busy, send me a young female apprentice…

 

[ban-all-sheds]

Ban perhaps you are thinking of what is termed a radial circuit which has one wire of each L(Live) N(Neutral) E(Earth) whereas a RFC has two of each at each socket.

Although I dont suggest you attempt it yourself but if you have a friend whose an electrician get him to remove a socket for you so you can see how an RFC is wired.

Thanks for that, Tim.

So does a radial have only 1 L, N & E at the sockets?

 

[THRIPSTER]

To NotHimAgain,


If a circuit has a node, does that mean it will only pass current in one direction?


Yours


Hugh Janus

 

[ban-all-sheds]

 

[NotHimAgain]

To NotHimAgain,

If a circuit has a node, does that mean it will only pass current in one direction?

Yours

Hugh Janus

Well that depends on what definition you want to use anus - whoops sorry Janus.

In electrical circuit theory a node is often defined as a point where two or more branches are joined - wait a minute TWO branches - don't tell BAS he be off on one again

 

[tim west]

Bas its two cables in each socket bar the end one, that makes it a radial

Stargazer i'd love to send one of the girls round but i keep them far too busy

 

[Spark123]

So are we all agreed that a socket wired to high integrity earthing standards in section 607 of BS7671:2001 can be wired like this?

 

[ban-all-sheds]

No.

It can be wired like that to conform to what normal practice is, and in accordance with what GN8 says, but it does not comply with 607 as written.

 

[ban-all-sheds]

Bas its two cables in each socket bar the end one, that makes it a radial

Ban perhaps you are thinking of what is termed a radial circuit which has one wire of each L(Live) N(Neutral) E(Earth) whereas a RFC has two of each at each socket.

I'm not sure I should listen to you - I'm not sure you know what you're talking about.

Although I dont suggest you attempt it yourself but if you have a friend whose an electrician get him to remove a socket for you so you can see how an RFC is wired.

But what if my friend removes a radial socket with two cables, how will we know it's not an RFC one, or vice-versa?

 

[Spark123]

Even though there are two CPC conductors in there, which if connected as described will have non common connections back to separate terminals in the earthing terminal?