The old oven I am replacing was wired up to two 6mm twin and Earth cables. The replacement oven has a different terminal connection arrangement and can only accommodate one of the cables. The cables disappear behind the kitchen units which I am not replacing but I think one of them may power the electric hob? Can I connect the two cables together and then run a single cable from the connection into the oven? What form of connector or junction box should I use. Thanks