1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJuly 24, 20141UL 2876Outline of Investigation for Remote Racking Devices for Switchgear andControlgearIssue Number 1July 24, 2014Summary of TopicsThis is the First Issue of UL 2876, Outline of In
2、vestigation for RemoteRacking Devices for Switchgear and Controlgear, covers requirements forequipment intended to provide a method to remotely operate (rack) awithdrawable element, such as a circuit breaker or fused contactorinstalled in switchgear or controlgear.ULs Outlines of Investigation are c
3、opyrighted by UL. Neither a printed norelectronic copy of an Outline of Investigation should be altered in anyway. All of ULs Outlines of Investigation and all copyrights, ownerships,and rights regarding those Outlines of Investigation shall remain the soleand exclusive property of UL.This issue bec
4、omes effective JULY 24, 2014.COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 24, 2014UL 28762No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION W
5、ITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Units of Measurement .44 Undated References 55 Glossary .5CONSTRUCTION6 General 57 Enclosures .58 Grounding and Bonding 59 Protective Devices 610 Wiring and Connections 611 Insulating Materials 612 Cord-Connected Equipment .613 B
6、attery Operated Equipment 714 Portability .815 Stability .816 Spacings 817 Current Carrying Parts 8PERFORMANCE18 General .819 Temperature Test 920 Mechanical Tests 921 Dielectric Voltage-Withstand Test .1022 Leakage Current Test .1023 Misalignment and Obstruction Tests 1024 Lifting Means Test 1025 S
7、tability Test .11RATINGS26 General 11MARKINGS AND INSTRUCTIONS27 Markings .1228 Instructions and Additional Equipment Information 12APPENDIX AStandards for Components .A1JULY 24, 2014 UL 2876 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULIN
8、TRODUCTION1 Scope1.1 These requirements cover equipment intended to mechanically move (rack) a withdrawable elementinto or out of the connected position, while allowing the operator to stand a distance from the equipment.Typical withdrawable elements include circuit breakers in metal-clad switchgear
9、 or fused contactorassemblies in controlgear.1.2 The requirements do not cover racking mechanisms that are installed within the switchgear orcontrolgear assemblies, or auxiliary devices used to signal internal racking mechanisms to operate.1.3 These requirements cover cord-connected or battery power
10、ed portable equipment with a supplyvoltage rating of 600 V or less.1.4 These requirements cover equipment intended for use in ordinary locations in accordance with theNational Electrical Code, NFPA 70.2 Components2.1 A component of a product covered by this Outline shall comply with the requirements
11、 for thatcomponent and shall be used in accordance with its recognized rating and other limitations of use. SeeAppendix A for a list of standards covering components typically used in the products covered by thisoutline. A component is not required to comply with a specific requirement that:a) Invol
12、ves a feature or characteristic not required in the application of the component in theproduct covered by this outline, orb) Is superseded by a requirement in this outline.3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproxi
13、mate information.JULY 24, 2014UL 28764UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the la
14、test edition of that code or standard.5 Glossary5.1 The definitions in the Standard for Industrial Control Equipment, UL 508, are applicable.CONSTRUCTION6 General6.1 Equipment as covered by this outline shall:a) Be so constructed as to provide for compliance with the rules for installation and use o
15、f suchequipment as given in the National Electrical Code, NFPA 70; andb) Employ materials that are acceptable for the particular use.6.2 Remote racking devices shall be provided with all the necessary adapters, special tools, or fittingsrequired to properly interface with each withdrawable element t
16、he remote racking device is intended tooperate.7 Enclosures7.1 Enclosures of electrical equipment shall comply with the requirements of the Standard for Enclosuresfor Electrical Equipment, Non-Environmental Conditions, UL 50.7.2 Enclosures marked with environmental Type designations shall comply wit
17、h the requirements of theStandard for Enclosures for Electrical Equipment, Environmental Conditions, UL 50E.8 Grounding and Bonding8.1 Grounding and bonding means shall comply with the applicable requirements in the Standard forIndustrial Control Equipment, UL 508.JULY 24, 2014 UL 2876 5UL COPYRIGHT
18、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9 Protective Devices9.1 Protective devices provided in the supply circuit shall be of the type suitable for branch circuitprotection.10 Wiring and Connections10.1 Internal wiring and connections shall comply
19、 with the applicable requirements in the Standard forIndustrial Control Equipment, UL 508.11 Insulating Materials11.1 Insulating materials shall comply with the applicable requirements in the Standard for IndustrialControl Equipment, UL 508.12 Cord-Connected Equipment12.1 Equipment that is cord-conn
20、ected to the power supply shall be provided with hard-service or juniorhard-service flexible cord, such as such as Type S, SJ, or the equivalent, that is rated for the temperatureand voltage involved.12.2 The cord ampacity, as specified in Table 12.1, shall not be less than the ampacity required for
21、 theequipment.Table 12.1Ampacity of flexible cordConductor size, AWGAmpacity of cord, ANumber of conductors2318 10 716 13 1014 18 1512 25 2010 30 2584035655447 6029 812.3 The supply cord shall be provided with a standard attachment plug that is rated for the voltageinvolved and have an ampere rating
22、 not less than the required cord ampacity as in 12.2.12.4 Cord-connected equipment provided with a standard attachment plug with an ampere ratingexceeding the ampacity of the power supply cord shall be provided with an integral overcurrent protectivedevice rated not more than the ampacity of the con
23、ductors.JULY 24, 2014UL 28766UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL12.5 Strain relief shall be provided on power supply cords.12.6 At the point at which the cord passes through the enclosure wall, protection shall be provided topreve
24、nt cord abrasion.12.7 If a knot serves as strain relief in an attached flexible cord, any surface that the knot may contactshall be free from projections, sharp edges, burrs, fins and the like, that may cause abrasion of theinsulation on the conductors.12.8 Means shall be provided to prevent the sup
25、ply cord from being pushed into the enclosure throughthe cord-entry hole when such displacement results in:a) Subjecting the supply cord or lead to mechanical damage;b) Exposing the supply cord or lead to a temperature higher than that for which it is rated;c) Reducing spacings (such as to a metal s
26、train-relief clamp) below the minimum requiredvalues; ord) Damaging internal connections or components.12.9 To determine compliance with 12.8, the supply cord shall be tested in accordance with thePush-Back Relief Test in the Standard for Industrial Control Equipment, UL 508.12.10 Cord-and-plug-conn
27、ected equipment rated for a nominal 120-, 208-, or 240-V supply shall complywith the Leakage Current Test, Section 22.13 Battery Operated Equipment13.1 Battery operated equipment shall be supplied with batteries having sufficient energy capacity tooperate the intended withdrawable unit(s) for a mini
28、mum of 5 operations without replacement orrecharging. For the purpose of this requirement, one operation is considered to be a complete withdrawal,followed by a complete insertion of the withdrawable unit.13.2 Battery operated equipment shall be provided with a means to prevent starting of a racking
29、 operationif there is insufficient energy remaining in the battery to complete the racking operation.13.3 Battery operated equipment having provisions for charging of the batteries shall comply with theappropriate requirements for battery charging for the type of batteries installed in the product.J
30、ULY 24, 2014 UL 2876 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL14 Portability14.1 Devices shall be provided with wheels, handles, or other lifting means to facilitate moving the deviceinto position.14.2 If provided, a handle or other li
31、fting means used to support or carry a product shall withstand a loadof four times the weight of the product without damage to the handle, its securing means, or that portionof the enclosure to which the handle is attached. It shall comply with the Lifting Means Test in Section 24.14.3 Devices provi
32、ded with wheels for portability shall be provided with a means to lock one or morewheels to prevent inadvertent movement of the assembly during the racking operation.15 Stability15.1 When tested in accordance with the Stability Test, Section 25, the remote racking device shall notoverturn.16 Spacing
33、s16.1 The spacings requirements in the Standard for Industrial Control Equipment, UL 508 apply.17 Current Carrying Parts17.1 A current-carrying part shall have the required mechanical strength and ampacity for the service,and shall be of metal or other material that is acceptable for the particular
34、application.17.2 An uninsulated live part shall be so secured to its supporting surface by a method other than frictionbetween surfaces that it will be kept from turning or shifting in position if such motion may result inreduction of spacings to less than those required elsewhere in this standard.
35、The security of a contactassembly shall provide for the continued alignment of contacts.PERFORMANCE18 General18.1 The performance of equipment shall be investigated by subjecting a representative sample orsamples in commercial form to the tests described in Sections 19 25. Except where specificallyd
36、escribed, the sequence in which these tests are conducted is not specified. Unless otherwise indicated,these tests shall be conducted at rated frequency. Devices rated both 50 and 60 Hz may be tested ateither frequency.JULY 24, 2014UL 28768UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT
37、ION ORDISTRIBUTION WITHOUT PERMISSION FROM UL19 Temperature Test19.1 The device shall be subjected to the Temperature Test described in the Standard for IndustrialControl Equipment, UL 508. The device shall be continuously energized from a circuit of rated voltage,and shall be operated using the max
38、imum duty cycle as specified by the manufacturer. The device shallbe operated until temperatures stabilize, or for a time period of three hours, whichever is less.19.2 The device shall not exceed the temperature limits as specified in the Standard for Industrial ControlEquipment, UL 508, and shall c
39、omply with the Dielectric Voltage Withstand Test, Section 21, at theconclusion of the Temperature Test.20 Mechanical Tests20.1 The Mechanical Tests may be conducted on a previously untested sample, or on a samplepreviously subjected to the Temperature Test.20.2 The device shall be connected in accor
40、dance with the manufacturers instructions to thewithdrawable unit it is intended to operate, and shall be subjected to the number of operations specifiedin Table 20.1. One operation is considered to be a complete withdrawal of the withdrawable unit, followedby a complete insertion.Table 20.1Required
41、 number of mechanical operationsWithdrawable device type Number of operationsCircuit breaker in low voltage metal enclosed power circuitbreaker switchgear500aCircuit breaker in medium voltage metal clad switchgear 500Withdrawable assembly in medium voltage controllers andcontrolgear1000Other device
42、500baFor ac rated circuit breakers rated above 3000 A, and for DC circuit breakers rated 4000 A and above, the number ofoperations may be reduced to 250.bAs specified in specific product standard for the withdrawable device.20.3 Devices designed to operate more than one type of withdrawable unit sha
43、ll be tested under the mostonerous conditions, with consideration to the mechanical loads imposed by devices of different mass, aswell as number of required operations.20.4 The device shall successfully complete the required number of operations without repair ormaintenance and shall comply with the
44、 Dielectric Voltage Withstand Test, Section 21, at the conclusion ofthe Mechanical Tests.20.5 The withdrawable unit shall not exhibit any damage at the conclusion of the Mechanical Tests. Itshall be possible to insert and withdraw the withdrawable unit using the normal manual means at theconclusion
45、of the test.JULY 24, 2014 UL 2876 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL21 Dielectric Voltage-Withstand Test21.1 After completion of each Temperature and Mechanical Test, the device shall be subjected to theDielectric Voltage-Withst
46、and Test requirements in the Standard for Industrial Control Equipment, UL 508.21.2 When the same sample is subjected to both Temperature and Mechanical Tests, or to multiplemechanical tests, a single Dielectric Voltage Withstand Test may be conducted at the conclusion of thesetests.22 Leakage Curre
47、nt Test22.1 Cord-and-plug-connected equipment rated for a nominal 120-, 208-, or 240-V supply shall besubjected to the Leakage Current Test in the Standard for Industrial Control Equipment, UL 508.23 Misalignment and Obstruction Tests23.1 Tests shall be conducted to demonstrate that misalignment of
48、the remote racking device will notresult in an unsafe condition.23.2 Tests shall be conducted to demonstrate that an obstruction, including damaged contacts of theswitchgear or controlgear, in the intended path of the withdrawable element, does not result in an unsafecondition.23.3 Unsafe conditions
49、 include, but are not limited to:a) Misalignment or improper seating of contacts;b) Incomplete withdrawal or insertion;c) Damage to the racking mechanism, withdrawable element, or any other parts of theswitchgear or controlgear assembly; andd) Inaccurate indication of the position of the withdrawable element.24 Lifting Means Test24.1 A load of four times the weight of the device is to be uniformly applied over a 3-inch (76-mm) widthat the center of the handle, without clamping. The load is to be started at zero and gradually increased sothat the test value is attained in 5 to
