Right Danny. Don't know why I used the word phase. Leg is correct. Single phase is for homes and 3 phase for motors and distribution.Thats not true. Joe is correct in his statement to an extent. He just said it wrong. It isnt phase that he is referring to. We all have single phase wiring in our homes. We have 2 legs of service to acheive 220v. You get that 220 when you go from hot on one leg to hot on the next. Thing is, at that point, you wont be concerned with neutral or ground. Look inside of a 220 cable. The ground and neutral wires are often smaller. Because, the most it is going to carry back is a 110. If you have 2 circuits on different legs leaking voltage, then there would likely be current in the tank and you would see the fish dieing.
For what its worth, regarding 220, a neutral connection is not required. The reason 220 appliances have the neutral connection is because clocks and buzzers and such only require a 110 connection. So, the 220 is split in half by the use of a neutral connection to those electronics.
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