First off, hire an electrician if you need to ask questions on wiring anything.

That said.

The length of the power cord on that unit is not long (say 8 feet) and it will carry the 30 amps that distance with no problem.

Specs in a home are different as the wires from the panel might be 100 or more feet long to the "outlet". You just need to make sure you have the amps at the "outlet".

The Imax is listed on the back of the machine, that's the maximum current it will pull at 220 volts AC from the "outlet" (the breaker size needed). So if it's 30 amps or less, you can get by with a 30 amp breaker.

The max cutting power is 50 amps at the torch on your unit, but it's not 220 volts at the torch. We drop the voltage to get the higher amperage to the cutting torch.

If you have a 40 amp breaker you're fine and our cord is fine as well.

The codes for a house, say it is #10 for 30 amps. That assumes a long cord/wire with loss, not a 10 foot piece of wire.