Ok to clarify some points
I stated that there is an RCD Twin Socket and every seems to have never seen one
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is where the current ring main is established.
I have worked as sparky apprentice but you rely sometimes on their guidance.
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 achieve.
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 :
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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 the problem
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