Item # 1 Electric Motor

There are two common forms of AC electricity – single-phase and three-phase. Single-phase is usually available in  115V  and  230V.  Most single-phase motors can be wired for either  115V  or  230V.  Three-phase is usually available in  208V,  230V  and  460V.  Most three-phase motors can be wired for either of the three voltage ratings. The standard frequency in the United States is  60 Hz.  Other voltages and cycles are usually available. The three most common types of electric motor enclosures used on mixers are open drip-proof (ODP), totally-enclosed, fan-cooled (TEFC) and explosion-proof (EP).

OPEN DRIP-PROOF (ODP) has ventilation openings in the end shield and shell placed so drops of liquid falling within an angle of 15 degrees from vertical will not affect performance. Usually used indoors, in fairly clean locations. This type is not explosion-proof.

TOTALLY-ENCLOSED, FAN-COOLED (TEFC) has no ventilation openings in motor housing (but not airtight, waterproof, or explosion-proof). Includes an external fan in a protective shroud, to blow cooling air over the motor. Used in locations which are dirty or dusty.

EXPLOSION-PROOF (EP) is a totally-enclosed motor designed to withstand an internal explosion of specified gases or vapors and not allow the internal flame or explosion to escape. Explosion-proof motors are individually rated for specific gases, vapors and conditions. Most INDCO explosion-proof motors are listed as  Class I, Group D  and  Class II, Groups E, F, and G  by  Underwriters Laboratories®.