Let's say I have 50 ft of 6 AWG wires running from 50A breaker to a 14-50 receptacle already but I want to run it another 5-10 ft so I can place the 14-50 receptacle further. Can I just buy an additional 10 ft of 6 AWG wires and connect them to the other 50ft wires WITHOUT having to run a whole new set of 60 ft wires?