Change a 120 to a 240 outlet

I have a 100 AMP Pushmatic breaker box in my garage. It is full of breakers that are all 120 volt that ranger from 15 to 30 amp. I want to hook up a 240 amp for a pump motor and a one for a welder. Can I hook up two of the 30 amp 120 volt breaker to accomplish this with each one?

I have a generator that has (2) 20 amp 110 outlets and (1) 240 outlet. The 240 outlet haev receptacle for four wire plug but I want to use it in a three 930 wire 240 volt plug at other end. Is this a workable solution?

Ok I have what I thought a simple project..ok I have a 5K watt generator that has a 240 v outlet.. I want to connect my 240 v arc welder to it..only problem is that the plugs are different.. I already have the proper plugs to adapt the connection ..I made a one foot adapter ( pig tail )... My...

I understand that it is possbile to wire a 120 volt outlet from a 240 volt outlet. My 240 volt outlet has 3 wires in, white, black, and a ground. Do I wire the 120 volt outlet from the either wire and the ground? My voltage meter indicates that connection is 120 volts. Is there any down side to...

We've switched to a central air conditioning system and no longer need the 240 volt outlet by the dining room window. The house was built in 1928, updated in 1957, and again a couple of ad hoc times thereafter. The wiring is at times very old, brand new or somewhat old. My guess is that the 240...