Single or three phase service? The four prong plug/receptacle to a domestic stove or dryer is called "three wire, four pole". An air compressor such as yours if on a receptacle would be called a "two wire, three pole". Air compressor make,model, size, type of starter? Size of cable you are using? Size and number of poles of the supply breaker. Bare copper is chassis ground or bonding. Neutral is an insulated current carrying conductor, with the confusing exception of overhead triplex service cable's bare neutral. Depending on how and where the utility ran power to your shop. That ground rod to neutral bar connection is wrong. No neutral needed, required or wanted at the compressor. Just two lines and a ground to chassis. Nothing personal, no slight or insult implied or intended but......... Why do people try to save a few bucks and have electrical equipment burn out? Give shocks, cause tingle voltage shocks to livestock, cause fires or just plain fail to operate properly? How much money is that saving?
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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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