I am helping out installing a new socket
The existing socket is a trip base dual domestic socket. Its part of a
ring main which has 2.5 twin core and earth.
I need to run a socket for to the middle of the room (i have done this
as a test - the breaker came on .. then about 5 minutes it tripped -
what could be the cause of this)
Firstly should i run 2.5 twin core and earth.. or can i get away with
I also saw on a website it would be all right just to run a single
cable instead of running a ring back... ?
Finally should i remove the trip socket to the end of this line .. and
just put a normal face plate / blanking plate across this unused
What advice can people provide on the above as I would like to get
OP: could you rephrase that please - I don't understand it either.
Yep - again, in clear English please. What did you do, step by step...
OP: Please read this. Anything that's unclear, feel free to come back any
query it here, but do read it first.
What's a "trip socket"? Do you mean "socket with inbuilt RCD"?
In principle you could join the cable there and put a blank on.
Your questions indicate that you are far from comfortable dealing with this.
I won't prejudge you, but I will ask: "do you feel that you are competent".
Do you appreciate things like grommets in metal back boxes, stripping cables
correctly, good workmanship, cable routing (is it OK to run one next to a
hot rad pipe - what about 15mm under the plaster?) etc. It isn;t exactly
rocket science to add a new socket but you do require *some* knowledge.
Anyway have a read and a think and come back.
Ok to clarify some points
I stated that there is an RCD Twin Socket and every seems to have
never seen one
This is where the current ring main is established.
I have worked as sparky apprentice but you rely sometimes on their
I work in computers and burglar alarm security I dont call everyone
and idiot because they cant do something. I understand we are talking
slightly different with mains but I came on here asking for advice. I
would say I have got a pretty good idea of what I am trying to
Normally we run an extension cable to get this extra point. I just
trying to erridicate this with adding the socket. Now I understand
that 2.5mm is the standard on a ring main but when you know there is
not a heavy load, you can use 1.5mm.
So the first part has been answered : yes you can use 1.5mm twin and
earth but use 2.5mm twin and earth
Again going to the trip socket :
I was wondering since I am spurring off this and not adding to the
ring that the socket was it compromise the rcd in the socket hence
I understand about grommets on back boxes, and running cables (the
cables are actually being run under a void and not near any radiator
pipes and have been clipped down.
I have correct tools, including multi meter where i have checked the
new cable for any earth fault or leak between the existing connection.
If it was due to incompetency why does the ring not trip out the
master circuit breaker at the distribution board until about 5 mins on
resetting ? !!! rather than tripping on turning the breaker on.
I hope this has made it a bit clearer .
NO I am not a sparky, but I think I am capable of doing this job.
I understand there is constructive advice on here
The wiring for the spur would be connected to the back of the RCD socket
at the same terminals as the existing two ring main cables. Therefore, I
can't see how that would have any effect on the RCD as the RCD should only
be protecting the actual socket outlets on the RCD. Or are you connecting
the spur to one of the sockets on the RCD - i.e. plugging the spur into
front of the RCD?
If plugging into the front of the RCD then there would seem to be a fault
between the plug and the spur.
As regards cable sizes for spurs etc., I was always under the impression
that the same size cable should be used that was on the existing circuit
(e.g. 2.5mm for a ring circuit) because the cable would be the same rating
as fuse / mcb - the same principle as not using a 13A fuse in a plug that
has 3A wire leading to table light, for example. The reason being that,
although the equipment (in this example the light bulb of a few watts)
wasn't drawing much current, if there was a fault in the equipment, a much
greater current could be drawn than what the cable was rated for, but may
not be enough to blow the fuse or trip the mcb. This could create a fire
No - you said there was a "trip base dual domestic socket".
Except you didn't describe it at all well.
The spur is surely coming from the back of the socket? And therefore the
type of socket that you are spurring from has no bearing on the spur, and
vice versa? I'm not an expert, but I'm pretty sure that a plug-in RCD
adaptor would still be expected to work on a socket which is hosting a spur.
And your twin RCD socket is surely just like a normal twin outlet, with
built in RCDs?
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