Discuss Safest way to add a fused spur? in the Electrical Forum area at ElectriciansForums.net

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I have 3 cables going to a double socket (original socket in a new build, I haven't changed it).

To spur off this and add an FCU I would've thought I would've had to obviously add a 4th. There are already 3 cores under each screw, feels like 4 might be 'cramming' which worries me.

What's the safest approach? Perfectly safe to add a 4th?

As always, thanks in advance for any advice. Always appreciate the help from here ?
 
Where is the FCU being located? If it’s just beside the socket, wire the FCU so it is part of the ring, leaving only 3 in the socket.
You will need to find out which cables are part of the RFC and which cable of the 3 is a spur
 
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I know Mate only you forgot to mention it you post, OP may have gotten confused
 
As the others have said, it would be best if you could make the new outlet part of the RFC = ring final circuit. Basically 4 wires in to a screw terminal is really pushing your luck!

With the three wires you have and (obviously!) the power off you should find two of them (say, checking the live wires) are connected to together (low resistance with meter, or continuity checker) as they loop round the ring and join again at your fusebox. The 3rd then must be the existing spur.

Ideally you can re-route one of these ring ends from this outlet to the new FCE and add a new wire from it back to the outlet to complete the ring again.
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Another option is, of course, to put a junction box in to attach your new spur, that should be enclosed in a suitable box. Generally folk here like the Wago terminals & realted boxes and they have 3-way ones ideal for this job that are rated at 32A (the 2.5mm should not see more than 25A).
 
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