Stephen, That's easy to explain, 220 has 2 hot wires that are 180 degrees out of phase with each other. 60 times a second the wave form is + and then -. When the voltage of one hot wire is at it's max positive, the voltage of the other wire is at it's max negative. It's like one power wire is pushing while the other power wire is pulling the electrons, then they switch.
Most people haven't seen two waves on a duel trace oscillscope. If you had, it would be easier to understand 220.
The two power wires 180 degrees out of phase is created by using a transformer that has a secondary with a center tap. The center tap is connected to the earth's ground. It makes up the common wire and at the same time the ground wire at the meter base. Then depending on the how far away it is to your load center is, one or two wires are needed to go from the grounding/common connection at the meter base to the load center. My load center is directly behind the meter base. Meter base is outside house and load center inside. Only one wire is going from the grounding/common connection of the meter base to the load center where it connects the grounding strip and the common strip inside the load center, which are connected together with a buss bar.
If I lived in a mobile home I would need to run 2 wires from the meter base's ground/common connection. One of those wires would go to the common strip of the load center and the other to the grounding strip and the buss bar is removed isolating the ground and common.
That said, all the best laid plans of mice and men go away when you wire up a 4 wire plug, as required by the gods of electricity the NEC, to a close dryer you buy today. Because at the appliance, you reconnect the ground wire and common wire together under the same lug... There seems to be much to do about nothing, you have just connected ground and common together again when you plug the dryer in. Safety first.
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