Originally Posted by tkrussell
I am a bit cloudy, exactly which wires are you refering to?
The large feeder wires? Should be no reason to extend those as since this is a new upgrade the feeder should be new, and long enough.
If you are refering to the branch circuit cables are too short, because the panel is in a new location, or the once the cables are in the new panel the wires that connect to the branch circuit breakers and neutral/ground wires are too short, then standard wirenuts sized to fit the amount of wires being spliced will be fine.