I currently have a range cooker connected to a large junction box, which in turn is fed from a cooker outlet on the wall. What I'd like to know is if it's safe to run a new socket further along the wall from the JB?
Without seeing a picture of your junction box and finding out the actual load on the box - its hard to say. Looping from a cooker ciruit is never really a good option anyway as you should have a sigle circuit dedicated to your cooker. Is there another double socket available near the place you need your new socket to be? It would be much safer to loop from a socket (on a radial or ring circuit) rather than the junction box. This is a good link for sockets - http://www.allaboutelectrics.co.uk/wiring/switches-sockets.html
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