Having electrics put in the garage next week. Got a friend's partner doing the fitting so it's all properly signed off but I'm digging and laying cable! He's advised 4mm cable. The run is fairly short only around 7m in length.
I've done a bit of reading and wondering if I should up the cable rating? I am not great with electrical stuff - for future use of machinery will this be sufficient? Screw fix don't seem to to 10m of 6mm which is frustrating!