New owner and I would like to understand the charge cord 120 vs 240 v

[wws]

Yeah, I don't know the reason for that. They are both 50A outlet types, so I would have thought they would both be 6 gauge. You're right that they are used differently, where the RVs are just using a lot of different 120V loads, but a welder is just one appliance on and off. Those Camco cords are really good--I have one--but they don't seem to make 6-50 ones. There are a few good looking ones in Amazon from like AC Works or Parkworld, etc.

Here is a "heavy duty" 6-50 extension from, where else, evseadapters: Heavy-duty NEMA 6-50 Extension Cord for Welder or EV – EVSE Adapters

 

[Rocky_H]

Here is a "heavy duty" 6-50 extension from, where else, evseadapters: Heavy-duty NEMA 6-50 Extension Cord for Welder or EV – EVSE Adapters

Oh, great! That one is made with 6 gauge. I hadn't thought to check them for that particular thing (I go there for all kinds of other stuff).

 

[gfunkdave]

I would also suspect that the ampacity limits assume Romex in insulation or THHN in conduit in a wall, both with limited ability to disspate heat. An extension cord is going to be out in the open air and will be able to stay cooler.