Originally Posted by scotzz
That is correct and I emphasize again that[B]only one of two plugs can be in the existing dryer receptical.[/B]...........either the dryer lead or.......the lead for the garage line extension. Think of this way.......it would be similar to having two dryers side by side.........I could only have one plugged in at a time. The receptical for the dryer is correct for the dryer and has a different pin configuration than the 240v receptical in the garage.
The problem is that you will be using a compressor that is a 220V 20 Amp on a 30 Amp breaker.
Not good to do.