Sorry for starting yet ANOTHER NEMA 14-50 thread, but I've been reading this wonderful forum for days and still have a couple questions... Background - waiting on delivery of my Model 3 AWD and trying to get my charging situation squared away. I have an attached garage and my electrical service is fine. I've decided to install a NEMA 14-50 for now. I had an electrician come take a look and we agreed that I would run a 6-3 romex from the garage into the basement, with the garage portion being inside conduit, and he would then come back and do the panel work and install a surface-mounted 14-50 outlet to make sure everything looks good. Since then, though, I'm second-guessing the plan - I would like to "future-proof" things so I can easily switch to a Wall Connector if I decide later.. From everything I've read 6-3 romex won't safely support much more than 40 amp charging (especially since at least part of it will be in conduit) because it gets de-rated for being romex and again for being in conduit. So I've priced out 4-3 romex instead... it's only ~$50 more than 6-3. Seems like a no brainer if it would work. In the short-term I could use the UMC on the 14-50 to charge at 32 amps, but someday down the road I could swap the 50 amp breaker for a 60 amp and replace the 14-50 with a Wall Connector and charge at say 48 amps. Here is the question: Would it be ok for me to run 4-3 romex instead of the 6-3 romex, and still have the electrician put a 50 amp breaker on it and a 14-50 outlet on the other end? Will the #4 wire fit into a standard 50 amp breaker? will it fit into the connectors on the back of a standard 14-50 outlet? I don't want to do this and have him show up and tell me I've screwed up. btw - I'd prefer to stick with the romex so I don't have to run conduit the entire way - current plan would only have conduit in the garage but not on the basement portion of the run. Thanks in advance for your advice!