My son decided he would do a spot of DIY and managed to drill through the ring main cable using the hammer action on my Kango drill ... what was going through his head at the time (apart from 240 volts) I still don't know ... however ... he's ok but the feed and return cable are both chopped. What's the best and safest way of reconnecting these two wires? I know I'll need to chisel the plaster out around the cable but how do I extend and join the cables back together?
Ash