I had a 10-30 outlet in my garage, chained to another 10-30 outlet. It's for my washing machine and this is how it has been since I moved in 8 years ago. It was behind a 20 amp breaker. !?! After some discussion on this forum and after I verified a floating ground wire and that the wire's were in fact 10/3 romex I upgraded both outlets to 14-30's, grounded the boxes they were in, and instead of daisy chaining them, I used wire nuts to run to the second outlet which is right next to it. Grounded the electrical boxes (they were not grounded previously!). Then I changed the breaker to a 30 amp breaker, and re-wired the dryer to use a 14-30. I ran into some issued with the breaker tripping when I was done, not sure where the short was , I did tape over a wire that split insulation while cramming everything into the metal box, but still had an issue. After a few attempts I finally got everything in there without tripping the breaker (maybe a hot screw was hitting the ground or something I'm not sure, it's a really tight fit!) I realize it's not great to have 2 outlets, but it allows me to not have to plug and unplug the washing machine all the time, and is a temporary solution until I have have a 14-50 or tesla wall charger installed at a later date. Currently I'm charging my volt off a 16 amp charger using the new outlet and have not had any problems. My concern is that the 10/3 wire run may be too long (box is on the far side of the house). I read that if it is over 50ft I should have 8awg, but I also read that if the run is less than 100ft I should be ok? Is there a way to test resistance (between black and neutral, or red and neutral) to ensure the run isn't too long? What should the resistance measure to be safe with the 30 amp breaker?