See the FAQ thread for some information about these devices.
Namely, these questions: "ALL I HAVE IS SMALLER OUTLETS AND I REALLY NEED A HIGHER RATE OF CHARGE. CAN I COMBINE MULTIPLE CONNECTIONS TO CHARGE MY CAR?" and "I HAVE SEEN A DEVICE THAT COMBINES TWO 120V CIRCUITS TO CREATE A 240V CIRCUIT. IS THIS SAFE?"
Namely, these questions: "ALL I HAVE IS SMALLER OUTLETS AND I REALLY NEED A HIGHER RATE OF CHARGE. CAN I COMBINE MULTIPLE CONNECTIONS TO CHARGE MY CAR?" and "I HAVE SEEN A DEVICE THAT COMBINES TWO 120V CIRCUITS TO CREATE A 240V CIRCUIT. IS THIS SAFE?"