Several people have recently asked me questions on extension cords. First off, for future questions, please ask them here in the forums instead of sending me email or a PM, that way everyone gets to benefit from the answers.
You can probably extend the EVSE's 24 foot range an additional 30 feet if you use a good quality L6-20 extension cord made with a minimum of 12AWG cable. One such source for these cords is here
. That is a 15 foot extension, which will give you up to almost a 40 foot reach (with the EVSE's cord) or you can get 2 and that will give you almost 55 feet.
I don't recommend you exceed this distance without moving to a heavier gauge cordset, such as at least 10awg. Otherwise your charge time will increase, and you (or some poor soul) will be paying for electricity that never makes it to your car, and is instead heating up the cord. Also: if the voltage drop is too much, the Leaf will stop charging altogether!