I checked again because of you and my mistake. You are right! At work, I use a Leviton Charger 240 v with 30 amp so just use a provided adaptor. So no UMC is needed. I must got confused with NEMA chargers somewhere.I'm sorry but that just doesn't make any sense. There is no way to plug a Tesla into a 30A outlet without using the UMC. Is it a NEMA 14-30 outlet (NEMA, not Nemo), or is it a J1772 charging station and you're referring to the J1772 adapter?