danley4612
Member
I'm not an electrician, but I did the same thing sort of. Well I tried anyway. I re-used the 6-3 NM-B wire to wire up my Tesla charger. The inspector failed the inspection. I did not know that wire is rated by temperature it can handle. The higher the temp rating the higher the amperage it can handle. Most big box stores that sell 6-3 is going to be NM-B and rated at 60C with max load of of 55amps which is fine for NEMA 14-50. Tesla charger requires a 60amp breaker and therefore needs wire to be rated for at least 60amps. So I had to get THHN wire in flexible metal conduit from Southwire which is rated at 90C with max amps of 75. So much for re-using the hot tub wire, I had to pull it and save it for something else someday LoL. Luckily my power company has a $750 rebate for installing Tier 2 EV chargers!Ours was installed for free!
We used to have a hot tub on our deck, we sold it. So we took existing wire and 50 amp breaker and installed a NEMA 14-50 outlet. No problems with my Lectron chsrger after 2 years and it charges all 3 Teslas just fine.
Told hubby I will eventually invest in a Tesla wall charger since we have 3 now.
Source: Cerrowire Resources - Ampacity Charts