Overcurrent devices cannot be doubled up for higher voltages.
You need breaker designed for 220V. While you are technically correct, you need the 220V breaker because it is designed so that you always get 220V from the two phases (as opposed to 0V from one phase) and so both "breakers," so to speak, always trip together. Don't just use two 110V breakers you have lying around, it is not safe.
The approved method is to obtain a 2 pole breaker of the right amperage to run your 240 volt appliance. Also approved but not used as much is a common tie bar that incorporates the two breaker toggle handles into one. The reason for this is safety, if just one breaker trips there will still be 120 volts to ground on the un- tripped breaker. Anyone working on the appliance thinking that the power was off could get a severe shock. This holds true also with switches to turn off 240 volt loads, don't just use a single pole (SPST) switch which just shuts off one leg, use a double pole single throw (DPST) switch which isolates the load completely.
The potential of 208 volts is a three phase voltage. On a three phase distribution panel you can obtain 208 volts from any two adjacent breakers, just like 240 volts on a single phase panel. L1 - L2 = 208V, L2 - L3 = 208V, L3 - L1 = 208V. L1 - N = 120V, L2 - N =120V, L3 - N = 120V. 208V/1.73 = 120V.
Do you mean tying two breakers together or tying two 120v wire together. You can tie two breakers together with a breaker tie bar if they are each on seperate legs of the panel and yes you will then have 240. If you are talking about tying 2 120v WIRES together BE CAREFUL! If those two wires come from different 120v legs of the panel you will have a direct short and a pretty serious spark to put it mildly. You should only tie 2 120v wires together that are on the same circuit. And you'll still have 120 at that point
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