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 - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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