Fused Connection Units | Wiring Accessories | Screwfix A fused connection unit known as an FCU is an outlet from the mains containing the fuse where the appliance is hard wired rather than using a plug or socket. Within the range there is a wide selection of trusted trade brands to choose from in a selection of finishes and colours to match any room decor. Junction Box Splice for a 220 Volt Electric Range Cable Splice Electrical Wires Electrical Question: I need to move an existing 220 /240volt outlet to make a new gas and electric range fit when plugged in. This outlet is as old as the house which was built in 1971. I don’t want to rewire the entire run, I just want to use the existing box as a junction box and run over about a foot to the new location with a plastic remodel box. Is it acceptable to run 10-3 wire to a 110V 20A junction box? Since you say you'd prefer 12/2, I'd guess you are looking to install a 15 amp outlet from an existing junction box running a 15A circuit. If this is the case, 10/3 should be fine provided the circuit will not be overloaded and everything else is done mindfully and to code.