Hi, I'm planning to use a switch socket range that doesn't include a cooker unit. The cooker feed can be nicely dealt with by their 45A DP switch but I'd still like a single socket. My plan was to use a dual-gang back box to house the DP switch plus a 13A single socket. When I wire the socket to the output of the DP switch, the conductors will be within the back box and about 100mm long. Can I use 2.5mm conductors or must I use 4mm? TIA for your comments. Brian.