Industrial Control and Systems: Controllers@ Contactors@ and Overload Relays@ Rated Not More Than 2000 Volts AC or 750 Volts DC Part 8: Disconnect Devices for Use in Industrial Control Equipment
The standards in this part cover AC motor-circuit switches rated 600 volts used in industrial control equipment. Also included are separable or accessory operating mechanisms and handles for the external operation of motor-circuit switches@ circuit breakers@ and molded-case switches. The devices covered by this standard are for application in combination starters@ motor control centers@ and industrial control panels. See Figure 8- 1- 1. Excluded are the operating mechanisms that are an internal or integral part of motor-circuit switches@ circuit breakers@ or molded- case switches. Horsepower-rated switches mounted separately in their own enclosures@ commonly called "safety" or "enclosed switches" or "miscellaneous "switches@" are not included in the scope of this standard. Although ANSVNFPA 70 (NEC) permits devices not rated in horsepower@ such as circuit breakers@ moided-case switches@ general-use switches@ and snap switches to serve as the disconnecting means in industrial control equipment under specified circumstances@ such disconnecting means are not covered by this standard. Also excluded are manual motor controllers@ pullout switches@ and wiring devices rated in horsepower. This standard does not address the suitablility of manual motor controllers intended for use as disconnecting means.?