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we are ordering the EBBR104 WT100 3 welding receptacle. Due to its remote location, we will need to upsize the feeder conductors to account for voltage drop. I wanted to see what was the max conductor

The EHD3100L breaker used in this catalog number  will accept 14-1/0 AWG conductors.  (you mean incoming wiring when you refer to feeder conductors).

The internal wiring from beaker to receptacle is #2 AWG, and is not changeable as it’s potted into the assembly.