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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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