UL 347-2009 pdf download – Medium-Voltage AC Contactors , Controllers , and Control Centers.
3 Definitions General terms 3.1 … •.. . .. 3.1.101 controller and controlgear: A controller consists of a contactor , overload protecti on , a manual externally operated disconnector , and a short-ci rcu it protective device , mounted and wired in an enclosure specifically designed and dimensioned for its application , in which all tests are conducted , and which may also include a grounding function. An auxiliary compartment may be provided if necessary to complete the function of the controller. NOT E: ” Controlgear ” is a general term covering contro J/ ers and auxiliary equipment supplied with contro J/ er vertical sections and in medium – voltage control centers. A current exceeding the rated continuous current 3.1 . 102 NOTE: Overcurrents can result from motor starting , overload , short-circuit , or ground faults. 3.1.103 short-circuit current (often called fault current): An overcurrent res ulti ng from a short-circuit due to a fault or an incorrect connection in an electric circui t. [1 EV 441-1 1-07] 3.1 .104 overload: Operating conditions in an electrically undamaged circuit that cause an overcurren t. [IEV 441 -11-02] 3.1 .105 conductive part: A is capable of conducting current , although it is not necessarily used for carrying curren t. [IEV modified)
3.1 .204 low-voltage control compartment: A containing only low-voltage components. 3.1 .205 auxiliary compartment: A containing components and busing as needed to complete the functional requirements of an individual controller or a control center beyond the operational functions provided by individual controllers 3.1 .206 line contactor: Contactor whose line terminals are energized when the isolating means is closed. 3.1 .207 connected position of a drawout (withdrawable) element: The position of a drawout (withdrawable) element in which it is fully connected to the main and secondary circuits. 3.1 .208 test position of a drawout (withdrawable) element: The position of a drawout (withdrawable) element in which an isolating distance or segregation is established in the main circuit and in which the auxiliary circuits are connected. [IEV 441 -1 6-27 , modified) 3.1 .209 Class E controller: Class E controllers are intended for controlling and protecting medium- voltage electric motors or other electrical loads , including transformers , capacitors , and branch circuits. 3.1 .21 0 Class E1 controller: Class E1 controllers utilize the main contactor to make and break all currents up to and including the breaking capacity of the controller. 3.1.211 Class E2 controller: Class E2 controllers utilize the main contactor to make and break load and operating overload currents and utilize medium-voltage fuses for interrupting fault currents that exceed the breaking capacity of the main contactor.