Back to basics with connections - help with clarifying this

[EFLImpudence]

It's more a case of there being 'special' conditions for allowing our ring final circuits with conductors which are smaller than required for the size of protective device.

A radial circuit with your requirements would be quite acceptable although, in actual fact, exactly the same.

 

[conny]

Should the word 'valve' in your post read 'VALUE'?

Indeed it should, well spotted.
Happy New Year conny.

Happy New Year to you too PBoD.

 

[conny]

Just to throw some more confusion into the mix.

If you regard a socket off the ring as a spur, and you can have one spur off the ring at any one given point, then it stands to reason that if you plug a 4 gang extension lead into the socket, (which you regard as a spur), connected to the ring you will then have 5 spurs at the one point.

 

[EFLImpudence]

But all protected by one 13A fuse which is allowed.

 

[conny]

Thats true.

 

[henry1]

I sorted it out more or less with the help of your various replies.

I was looking at it all along on paper from a schematic point of view. On paper, a junction is just a dot and you can have as many wires coming out as you want. In practice things are a little harder.

Also, I guess the definition of a spur includes the word cable, that way a connection at a socket cannot be describe as a spur, even by myself. Then every time you make a spur connection, ie with a cable, you need to connect the cable to something, that means more screws that can become loose. More spurs also mean more cables which are not free. So while on paper I can draw a line from a dot and call it a spur, in practice this creates a lot of new conditions.

There is also the case of spurs being a special condition for a ring circuit, thus the need to keep it at a minimum and simply allow a single spur off anything.
As rjm2k says,

why bother making more and more exceptions to rules when it's considered bad practice anyway?

I was glad to read that there was nothing fundamentally wrong with the set-up I was describing initially as this is apparently what is used in radial circuits.

 

[rjm2k]

I was glad to read that there was nothing fundamentally wrong with the set-up I was describing initially as this is apparently what is used in radial circuits.

Except of course that a radial is always protected by a lower rated MCB than the wiring.

 

[securespark]

Should the word 'valve' in your post read 'VALUE'?

Indeed it should, well spotted.
Happy New Year conny.

But it might be a good idea if there was a valve in the cable. It would let out all that harmful excess current before it could damage the cable.

 

[TonyW2]

And I thought I was bored after Xmas!