yes, you can extend those wires. However, you do need to use the correct wire type. Those are high voltage, AC wire, and require specific properties that standard wire do not offer. Others here will tell you they have done it using regular wire, speaker wire, etc. But, do you want to play with 1000 volts AC?
buy the right wire, solder, not tape, then cover all connections with heatshrink tube.
If you don't want to deal with it, let me know.