In North America we have 120 and 240 single phase in homes.
Within that you get 2, 3 and 4 wire wiring methods. 2 wire is almost obsolete.
3 wire 120 and 4 wire 240 always have a ground and neutral both. 4 wire 220 is just so you run 120 v on the same circuit.
An easy way I've explained it to people is, while using a circuit, the neutral voltage floats around depending on a bunch of things. If you cheat and use your ground conductor as the neutral, its voltage will now float, as will the voltage of anything metal grounded on the same circuit.
So you've taken away the escape route for stray current and electrified everything.
Been in lots of barns with this problem. Neighbour broke his arm climbing the hay conveyor. He touched the metal siding and the 40 volts in the conveyor frame went through him to ground. He jerked and fell from 20 ft.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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