OP was wanting to run a circuit that supports 85A…. Wiring that supports that current won’t physically fit into the Rivian EVSE terminals.Per page 16 the installation manual, it can be used with wiring from 6 AWG 14 AWG depending on how the operating current is set.
Yes, that is correct! Breakers protect the wire (and plug which is NA here due to requirement for hardwire) at their weakest link. Thus, 60 amp (~$15+) to protect the 6 AWG at 48 amps continuous.If you pigtail down to 6, I think you’d need to install a breaker commensurate with 6 gage, not 2 gage. If you ever wanted to install a larger EVSE then you’d have to upgrade the breaker when you removed the pigtail, but that’s far easier than having to pull another wire run. Just my opinion, I’m not an electrician so ask yours.
No electrician here either but I would think you would be less protected running a 90 amp breaker unless your wiring everything it was connected to was very large. Maybe yours is.I have had a Tesla Charger on a 90 amp breaker. It allows you to add additional chargers to the original. It should work the same with the Rivian.