What is the maximum extension cord length I can use with the Millermatic 211?

For 120V operation, the maximum recommended extension cord length is 8 meters (27 feet) using 2.5 mm² (14 AWG) conductor. For 230V operation, the maximum length is 16 meters (53 feet) using the same 2.5 mm² (14 AWG) conductor. When calculating maximum length, remember to include the length of conductor between the disconnect switch and the wall outlet. (Page 14)