Three phase or two phase? Three phase requires three large wires for the current needed
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No.It'll overload and fail just about immediately.It's possible - but not recommended - to run two 110 v heaters in series from a 220v circuit.
Most 220 volt equipment will work on 208 volt supply. If the machine has a resistive load then the watts output will be lower than if supplied from a 220 volt source. If it is a motor load you will find that the equipment may run a bit slower but most motors will take the lower voltage. If the machine is a plug in device, install the appropriate receptacle to match the pin configuration and plug it in. If it is a hard wire installation this should be done by a qualified person.
You can't. A 220 volt dryer requires 220 volts in order to operate properly. It will not run on 110 volts.
Amp draw is always combined. 220V is uncertain if it is three phase or not, because there are both one phase and three phase applications of the 220V motor. In any case, the answer is always "combined".
There has to be a pull box between every four quarter bends in a conduit run.