The green ground on the 4-pole 240 volt plug serves the same purpose as the ground on 3- prong 120 volt plugs; old stuff didn't have it and it was added years ago for extra safety. The only reason they need a white neutral to the dryer is that some of the dryer components (display, timer, motor, etc) are running on 120V while the heating coil is 240V. If everything in the machine were running at 240 volt 2 hots + a ground would be perfectly safe. Like an electric 240 volt water heater in your basement, you only need 2-wire + ground. An open neutral by itself is not going to cause someone to be shocked, there would have to be some other breakdown failure as well.
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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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