Tesla has used two conductors in parallel for each of the hot wires [4 conductors total + ground] in their UMC and WC cables. I don’t remember the AWG used. This allows the cable to be smaller and much more flexible than using single conductors like conventional extension cords do.Regarding the 6 vs 4 gauge wire along with the 48 amp vs something lower issue on the INPUT side of a WC, however looking at and handling the cord from the WC to the plug on the OUTPUT side of a WC, it seems so thin and pliable even when cold. Does anyone know the size of the wires inside the cord's rubber sheath?
Tony Williams at QuickChargePower sells this special cable. I bought a 50’ extension for my UMC from QCP with a standard J1772 plug for compatibility with other EVs. It has been nice to have on several occasions.