1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFebruary 15, 20101SUBJECT 2727OUTLINE OF INVESTIGATIONFORRETROFIT MOTOR CONTROL CENTER UNITS FOR USE WITH SPECIFIEDMOTOR CONTROL CENTER SECTIONSISSUE NO. 1February 15, 2010Summary of TopicsThe fi
2、rst issue of the Outline of Investigation for Retrofit Motor ControlCenter Units For Use With Specified Motor Control Center Sections,Subject 2727, applies to motor control center units intended for use asretrofits for use with specified motor control centers rated 600 Vmaximum where the available s
3、hort-circuit current is 200 kA maximum.COPYRIGHT 2010 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFEBRUARY 15, 2010SUBJECT 27272No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTI
4、ON ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Undated References 44 Glossary .4CONSTRUCTION5 General 5PERFORMANCE6 General 5RATINGS7 General 5MARKINGS8 Details .6FEBRUARY 15, 2010 SUBJECT 2727 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
5、N ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover motor control center units intended for use as retrofits for use withspecified motor control centers rated 600 V maximum where the available short-circuit current is 200 kAmaximum.2 Components2.1 Except as ind
6、icated in 2.2, a component of a product covered by this standard shall comply with therequirements for that component. See Appendix A of the Standard for Motor Control Centers, UL 845, fora list of standards covering components generally used in the products covered by this standard.2.2 A component
7、is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, orb) Is superceded by a requirement in this standard.2.3 A component shall be used in accordance with its rating
8、 established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used o
9、nly under those specific conditions.3 Undated References3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.4 Glossary4.1 CLASSIFIED MOTOR CONTROL CENTER UNIT A motor control ce
10、nter unit identified by themanufacturer of the motor control center unit as suitable for use in a specified motor control centersection as an alternate to the specified motor control center unit.4.2 SPECIFIED MOTOR CONTROL CENTER A motor control center identified by the Classifiedmotor control cente
11、r unit manufacturer by a type number, catalog number or the equivalent provided onor with a Classified motor control center unit.4.3 SPECIFIED MOTOR CONTROL CENTER UNIT A motor control center unit identified by thespecified motor control center manufacturer by a type designation, catalog number or t
12、he equivalent foruse with that manufacturers motor control center section.FEBRUARY 15, 2010SUBJECT 27274UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONSTRUCTION5 General5.1 A classified motor control center unit shall comply with the const
13、ruction requirements for motor controlcenter units in the Standard for Motor Control Centers, UL 845, and in addition Sections3-6.Theinvestigation will include, but is not limited to:a) Spacings evaluation, such as electrical spacings, wiring space, and wire bending space;b) Openings in the classifi
14、ed motor control center unit enclosure, framework, or door when theclassified motor control center unit is installed in the specified motor control center;c) Accessibility of wiring terminals with the classified motor control center unit installed in aspecified motor control center;d) Use of the cla
15、ssified motor control center unit and the specified motor control center externalhandle when applicable; ande) Suitability of the classified motor control center unit and the specified motor control centerdoor interlock when applicable.PERFORMANCE6 General6.1 A classified motor control center unit s
16、hall comply with the performance requirements for motorcontrol center units in the Standard for Motor Control Centers, UL 845 for each of the specified motorcontrol centers the unit is intended to be used.RATINGS7 General7.1 The electrical ratings of a classified motor control center unit shall be a
17、s described in the Standardfor Motor Control Centers, UL 845.FEBRUARY 15, 2010 SUBJECT 2727 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMARKINGS8 Details8.1 A classified motor control center unit shall be marked in accordance with the req
18、uirements for motorcontrol center units in the Standard for Motor Control Centers, UL 845 and this standard.8.2 A Classified motor control center unit shall be marked to clearly identify the specified manufacturer(s)and type designation, catalog number or the equivalent of the motor control center section(s) the unit isintended to be installed.Added 8.2 effective October 15, 2010FEBRUARY 15, 2010SUBJECT 27276
