High integrity earthing

[daytona]

wheres BAS sloped off to anyway?

 

[tim west]

No id expect continuity but that still doesnt mean only one cable at each socket there are two physical cables at each socket in a RFC, count them if you dont believe me.

obviously if you look at the socket there are two cables.the point that some are trying to make is this.
although you have two physical cables at the socket,the effects when connected and energised,are as one.

if you take a brown out of a breaker and re-energise the circuit and grab that cable,you will get a belt.check if you dont believe me,if your not shaking to much afterwards,then you could reply with something less patronising.

what you are suggesting is a very dangerous thing to do and you shouldnt really suggest such a thing on a diy forum.

 

[daytona]

true mate, sorry folks.dont grab live conductors its dangerous and you could be hurt.especially on an rfc,because removing one end of your loop is not enough.both ends will still be live

 

[Spark123]

although you have two physical cables at the socket,the effects when connected and energised,are as one.

afaict the reg is aiming for you to have two individual conductors when they are smallish sized to remove the risk associated with the loss of one of them, the chances of losing both have got to be a lot less than losing just one.

 

[ban-all-sheds]

Its quite simple really Bas you have two lives two neutrals and two earths at every socket in a RFC

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

Does that mean that a radial is the same as a ring, apart from the last socket?

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.

Sorry - I forgot your first post.

Which of your posts should I trust?

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.

Won't my friend have to remove all of my sockets to show me? I'm worried about the amount of work involved for him...

 

[ban-all-sheds]

No id expect continuity but that still doesnt mean only one cable at each socket there are two physical cables at each socket in a RFC, count them if you dont believe me.

I just counted the cables in the diagram that Spark123 posted.

There are 6.

Does that mean that his circuit has too many earths?

 

[tim west]

It may be best if you get a book out on the subject, I wouldnt want you to come to any harm, or ask your friend for advice, good luck with your studies.

 

[ban-all-sheds]

I'll put this to a vote.

Shall I:

A) carry on making fun of Tim, or

B) draw a line under it now and tell him not to be so patronising, and to work on his ability to count to two?

 

[tim west]

If you make fun of me I won't help you 1 2 1 2 3

 

[ban-all-sheds]

Strangely, that doesn't seem to worry me...

 

[ban-all-sheds]

if its worded as you say then i dont know why you can use purely the cpc in the twin and earth.the reg implies this is not enough surely.

Agreed.

i know we all do it but is that reg is wrong,or we are installing it wrong.

Good question.

 

[Spark123]

A single length of 1.5mm² CPC is adequate for a 32A circuit - otherwise a normal spur on a normal RFC wouldn't be allowed.

There are two conductors each connected independantly connecting each point to the earthing terminal/MET as drawn on the pic I posted before.

 

[ban-all-sheds]

The regulation requires that the circuit has two individual protective conductors.

Could you do 2nd version of your diagram, and indicate on it, in relation to the circuit, which is individual cpc #1, and which is individual cpc #2?

 

[Spark123]

There are two individual paths to the MET (via the rest of the sockets on the circuit) from each point, as I put in the PIC I posted before.

 

[ban-all-sheds]

Current can flow along two paths to the MET from any point between the ends.

That is not the same as the circuit having two individual conductors.

If the circuit had two individual conductors you could identify them on the drawing, either by arrows, or colour coding, or whatever, and you could say "this is individual conductor #1" and "this is individual conductor #2".

That you cannot do this shows that the circuit does not have two individual conductors.