An extension cord feeds the device. Really a whole other circuit that has to be designed as a unit. You can hook a DialArc up with a 16 gauge extension to a 100 amp circuit and it will run. Until the extension cord starts on fire. The feeder circuit will still be protected and be fine. It may also adversely affect the end device due to voltage ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.