I almost revived this old thread, but went ahead and started a new one and could always ask a mod to collapse it in there if its better served there given the info in that thread. Wire Gauge Size for 50 Amps I am finally getting around to having a 14-50 added in the garage so I can get off 119/120v charging. I got a quote from an electrician another Tesla owner used for $400 to switch some circuits in my panel to make room for a 50 amp GFCI breaker. The electrician would then run 6 gauge aluminum about 25 feet from the panel in the basement upstairs to the garage. The kitchen is directly above the basement panel and the kitchen and garage share a wall. I was half tempted to go ahead and run Romex 6-3 NM-B through so an electrician only needs to create the receptacle box and add in a new breaker at the panel, but I'm confused on that process for running that through conduit (or not) because the basement is finished in on the walls with an exposed ceiling and the garage is finished in on the wall the cabling would run up (but exposed on the wall the outlet would be installed on, so wiring would run along beam where wall/ceiling meet alongside the current 120v run). The existing circuits for 120v 15amp outlets in the garage and the exterior lighting + outlets runs up the same wall. Anyways, he said 6-gauge aluminum is fine for my run, but I thought to ask here. He also stated I would not need a permit, so I thought I would ask here for a second opinion. I've had bad luck with electricians multiple times in the past, so I'm concerned. What do you all think?