That means nothing else plugged into the circuit except the welder. Some need even more power to reach maximum output, something like 25 amps of 115v input ( which to me is sort of pointless since the idea of a 115v machine is to be able to use it on "standard" circuits.) to obtain the max suggested settings. If you read the manual on the vast majority of these little machines, they rate them on a 20 amp dedicated circuit. If you are running of a 15 amp circuit you are already dropping the available power down. My guess is with a 10 ga cord it will be the 15 amp circuit that will be your biggest limitation. The 8 ga cords I see are usually 30 amp 230v ones for gensets to aux hook ups for homes. largest I typically see is 10 ga, and usually designed for large draw tools over longer distances. Not enough to matter, and finding an 8 ga extension cord designed for 110v power isn't easy. The lite gauge cord was there mostly to run a small light and the battery chargers, not try and power big draw tools like the air compressor and saws. It turned out when he unplugged the air compressor from my 2 10 ga 100' cords and plugged them into the customers 2 14 ga 100' cords, the compressor couldn't draw enough juice over that distance to run properly and would stall. However he wasn't paying attention to what cords he unplugged and pluged back in to which extension cords. Turns out the helper was playing musical cords when he needed to plug a different tool in because if he plugged into the power strip on the other cord, he'd trip the onboard breaker. It took me a bit to figure out what was going on. Some times it would seem to work just fine, then suddenly at other times it wouldn't. When drained, it would fire up no problem. All it would do is try to start, stall and then hum, so we'd quick shut it down. All of a sudden my air compressor stopped wanting to run when it tried to kick back on after the pressure dropped. I recently this summer ran into a very clear cut case of this happening. Understand that even with a heavy cord like a 10 ga one, you are going to have some voltage drop and this will effect the ability of that small machine to produce it's maximum output. 10 ga over 100 foot shouldn't be an issue, but I have no idea what the HF cords are like. Typically the answer is to go to a larger cord like you have to reduce the resistance and lower the drop in voltage that occurs. What you are describing is typically called voltage drop due to the resistance of the cord.
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