Listed Motor Circuit Switch

Motor branch circuit conductors are protected against overcurrent by overloads sized at 115 to 125 percent of motor nameplate current rating 430 32.

Listed motor circuit switch. Listed electromechanical motor controller ul 508 or ul 60947 4 1 nldx or listed solid state motor controller ul 508 or ul 60947 4 2 nmft without motor overload protection fast mc slow mc same as mc above except designates two individual contactors fast speed and slow speed for two speed motor controller. There is a new exception permitting a listed non fused motor circuit switch having a horsepower rating equal to or greater than the motor horsepower to have an ampere rating less than 115 percent of the full load current rating of the motor. You must protect each motor branch circuit against short circuit and ground fault by a protection device sized no greater than the percentages listed in table 430 52. You must protect each motor branch circuit against short circuits and ground faults by a protection device sized no greater than the percentages listed in table 430 52.

Motor branch circuit and at the motor disconnecting means motor controller identification pullout switches as listed to ul1429 will contain a marking near the agency symbol. The substantiation for this new exception demonstrated that it is common for non fused switches with. Selector switch has been added to a simple circuit on off motor for mode selection. Multipole switches are permitted for use only on.

A motor circuit switch is generally required to be rated in. Manual no operation nop auto have fun. Molded case switches as listed to ul 489. This marking should read listed pullout switch.

Used for motor motor circuit and group motor protection. Circuits unless listed and marked for other than single circuit use. Requirements for motors motor components and controllers can be found in a number of articles in the national electrical code nec but article 430 specifically covers motors motor branch circuit and feeder conductors and their protection motor overload protection motor control circuits motor controllers and motor control centers mccs 430 1.