Looking to re-configure my NEMA 6-50R receptacle that was part of my LEAF install over to NEMA 14-50R. Quickest way to do this would to just buy "6-50p to 14-50r" adapter form here. Right thing to do would be to change the receptacle to 140-50r. When I opened the electrical box, I noticed I have only 3 conductor's. Neutral (white) conductors is not used for 6-50R was not pulled from the panel. I have two choices: 1) Buy the $55-$75 6-50P to 14-50R and I am done. 2) Hire an electrician and pay $200-$300 (I am guessing on the cost) to run a new wire. Approx. 20-feet from the panel to add the neutral wire. I would also take this opportunity to upgrade my 40-amp circuit to 50-amps (if possible). So question is: by using the adapter, am I compromising on safety somehow? One extra point of failure. Neutral wire not being utilized. I know extension cords are a "no-no" when it comes to high-current situations. This adapter (2ft or 10ft) is basically an extension cord. Anyone has any experience with these adapter?