For all you electrical experts out there. I believe I am allowed to take a
spur from a socket which is on a 2.5 mm sq cable ring main, and have one
socket on that spur. If I take another spur from a seperate socket in the
same room, can I join these two spurs as a seperate ring and connect say 3
or 4 sockets to the joined spurs. In effect I end up with another subsidiary
ring of the same current carrying capacity as the main ring, it seems there
shoudn't be any overload problem, or is this against the wiring regs.
Having a ring with parallel bits as you describe isn't one of the
'normal configurations' therefore to conform with the wiring
regulations you'd have to do all the loading calculations from first
principles. That's a non-trivial task.
The advantage of staying with one of the normal configurations is that
you are (effectively) allowed to assume that the calculations have
been done for you already and that as long as you don't do really
silly things everything will be OK.
You might be able to get the effect you want by simply splitting the
existing main and inserting a new length of 2.5sq mm T&E between the
ends you have thus created to make a new, longer ring. There's no
rule that says you can't run the ring back on itself or whatever.
Thanks for the replies. Having thought a bit more I can see that there could
be a potential difference generated between the two spur sockets that would
cause a possible high circulating current in the parallel ring, probably not
a good idea. I was really trying to avoid splitting the old ring as its
position a and wire lengths mean junction boxes under the floor which I
don't really like even though its legal at a pinch. Is there anything that
stops me using suitable sized chocolate block connectors inside the socket
wall boxes to split and extend the ring, that is if they will fit in????>
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