1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 20161UL 891AOutline of Investigation for Switchboards Rated 601 - 1000 VIssue Number: 1October 14, 2016Summary of TopicsThis first issue of the Outline of Investigation for Switchboar
2、ds Rated 601- 1000 V, UL 891A applies to switchboards nominally rated between 601and 1000 V for use on circuits having available short-circuit currentsof not more than 200 000 A, and intended for use in accordance with theNational Electrical Code (NEC), ANSI/NFPA 70.ULs Outlines of Investigation are
3、 copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPY
4、RIGHT 2016 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .
5、42 Components 42.1 References 42.2 Undated References 42.3 Components .43 Definitions 54 Units of Measurement .55 Electrical Characteristics of Assemblies 56 Information to be Given Regarding the Assembly .57 Service Conditions 68 Design and Construction .69 Test Specifications 710 Tables 711 Figure
6、s .8SUPPLEMENT SA - Use of Components Not UL Listed or RecognizedAppendix A Standards for ComponentsAppendix B Standards Referenced in the Trinational Switchboard StandardAppendix C Markings Required to be Translated and Suggested French TranslationsAppendix D Example of Series Short-Circuit Current
7、 Rating MarkingAppendix E Example of Terminal Torque MarkingAppendix F Short-Circuit Test at Reduced VoltageAppendix G Maximum 100 000 Ampere Short-Circuit Current Rating Without Short-Circuit TestOCTOBER 14, 2016 UL 891A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTIO
8、N WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Standard applies to switchboards nominally rated between 601 and 1000 V for use on circuitshaving available short-circuit currents of not more than 200 000 A, and intended for use in accordancewith the National Electrical Code, ANSI/NFPA 70.2 C
9、omponents2.1 References2.1.1 This Outline includes references to requirements in the Standard for Switchboards, UL 891. Allreferences noting “UL 891” are to the 11th Edition of that Standard, dated July 26, 2005, with the latestRevision Date of October 31, 2012. Additionally, UL 891 is a tri-nationa
10、l Standard, whereas this Outlineis for US application only. References to requirements for Canada (C22.2 No. 244-05) or Mexico(NMX-J-118/2-ANCE-2006) do not apply.2.1.2 Where references are made that indicate UL 891 “applies with modification”, the clauses providedin this Outline are numbered to mat
11、ch the corresponding requirement in UL 891. These clauses replacethe corresponding clauses in UL 891.2.2 Undated References2.2.1 Any undated reference to a code or standard appearing in the requirements of this Outline shall beinterpreted as referring to the latest edition of that code or standard.2
12、.3 Components2.3.1 Except as indicated in 2.3.2, a component of a product covered by this Outline of Investigation shallcomply with the requirements for that component.2.3.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in
13、 the application of the component in theproduct covered by this Outline; orb) Is superseded by a requirement in this Outline.2.3.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.3.4 Specific components are incomplete in construction features o
14、r restricted in performancecapabilities. Such components are intended for use only under limited conditions, such as certaintemperatures not exceeding specified limits, and shall be used only under those specific conditions.OCTOBER 14, 2016UL 891A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
15、EPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 DefinitionsSection 3 of UL 891 applies without modification.4 Units of MeasurementSection 4 of UL 891 applies without modification.5 Electrical Characteristics of AssembliesSection 5 of UL 891 applies with the following modification:5.2.1 The vo
16、ltage rating of a switchboard section or interior shall be nominally rated at 1000 V or less andis the voltage range for which the assembly has been evaluated.6 Information to be Given Regarding the AssemblySection 6 of UL 891 applies with the following modification:6.3.4.3.1 To provide for system p
17、erformance testing, each ground fault relay or apparatus incorporatinga ground fault relay or its functions intended for protection of a solidly grounded wye service shall beprovided with information sheets describing system testing instructions, and with a test form. The formshall include a space f
18、or the date the test was performed and the results, and shall state that the formshould be retained by those in charge of the buildings electrical installation in order to be available to theauthority having jurisdiction. The instructions shall include the following items and shall basically prescri
19、beonly that information necessary to perform the tests. The instructions shall be separate and apart from anymore elaborate test detail that the manufacturer may wish to provide. The instructions shall specify that:a) The interconnected system shall be investigated in accordance with the switchboard
20、manufacturers detailed instructions, and that this investigation is to be undertaken by qualifiedpersonnel.b) The location of the sensors around the bus of the circuit to be protected shall be determined.This can be done visually, with knowledge of which bus is involved.c) The grounding points of th
21、e system shall be verified to determine that ground paths do notexist that would bypass the sensors. The use of high-voltage testers and resistance bridgesmay be suggested.d) The installed system is to be tested for correct response by the application of full scalecurrent into the equipment to dupli
22、cate a ground fault condition, or by equivalent means such asby a simulated fault current generated by:1) a coil around the sensors or2) a separate test winding in the sensors.OCTOBER 14, 2016 UL 891A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION
23、FROM UL7 Service ConditionsSection 7 of UL 891 applies without modification.8 Design and ConstructionSection 8 of UL 891 applies with the following modifications:8.1.13.1 A switchboard section or interior marked for use as service equipment for 3-phase, 4-wire, solidlygrounded wye-connected services
24、 rated in excess of 150 V to ground, but not exceeding 1000 Vphase-to-phase, shall be provided with ground fault protection for each service disconnecting means rated1000 A or more. The ground fault sensing and relaying equipment provided shall operate to cause theservice disconnecting means to open
25、 all ungrounded conductors of the faulted circuit. The maximumsetting of the ground fault protection shall be 1 200 A and a maximum time delay shall be 1 second forground fault currents equal to or greater than 3 000 A.8.1.15.1 Except for the following, equipment shall not be connected to the supply
26、 side of the servicedisconnecting means:a) meters nominally rated not in excess of 1000 V located in the switchboard;b) instrument transformers (current and potential), high-impedance shunts, Type 1 surge-protective devices, and load management devices;c) control circuits of power operable service d
27、isconnecting means, if suitable overcurrentprotection and disconnecting means are provided, see 8.1.11.1.1;d) Ground-fault protection systems or surge-protective devices, if suitable overcurrentprotection and disconnecting means are provided, see 8.1.11.1.1; ande) taps used to supply load management
28、 devices, circuits for stand-by power systems, firepumps, and fire and sprinkler alarms.8.4.8.1 High-impedance grounded neutral systems may be used on 3-phase alternating current systemsrated 480 V or 1000 V (wye or delta). Provision for line to neutral loads shall not be provided.8.5.1.5 A fuse or
29、circuit breaker pole shall be provided for the protection of each ungrounded conductorexcept as follows:a) taps used to supply load management devices, circuits for stand-by power systems, firepumps, and fire and sprinkler alarms;b) through or splice bus or wire;c) in a Class 2 circuit;d) for copper
30、 wire smaller than 16 AWG (1.3 mm2) if the wire is treated as an arcing part in theapplication of 8.2.1.3.1 and 8.8.1.8.5;e) for high-impedance shunt circuits, lightning arresters, Type 1 surge protective devices, andinstrument transformers (current) installed on the supply side of the service disco
31、nnectingmeans;OCTOBER 14, 2016UL 891A6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULf) for meters nominally rated not in excess of 1000 V that do not include potential coils; andg) as stated in 8.6.6.8.1.2.8.8.1.7.2 A bus bar or uninsulated
32、live part, other than a pressure wire connector as mentioned in8.1.16.6, shall be secured so that ordinary vibration will not loosen the securing means and shall beprevented from turning or shifting in position if any spacings less than half those shown in Table 6 wouldresult from such turning or sh
33、ifting. A bus bar provided with one or more insulators that must be removedwhen a branch circuit unit is installed shall be prevented from any turning that would result in spacingsless than one-half those specified in Table 6 with all insulators in place, or that would result in spacingsless than 3.
34、2 mm (1/8 in) for a voltage up to 250 V, or 6.4 mm (1/4 in) for a voltage between 251 to 1000V, with any insulators omitted.9 Test SpecificationsSection 9 of UL 891 applies without modification.10 TablesSection 10 of UL 891 applies with the following modifications:Table 6Minimum spacings(8.1.3.5, 8.
35、1.16.1, 8.1.16.2, 8.1.16.6, 8.1.16.7, 8.1.16.8, 8.1.16.11, 8.1.16.14, 8.1.17.5, 8.4.6.1.2,8.7.1.2.1, 8.8.1.4.4, 8.8.1.7.2, 8.8.1.7.3, 8.8.2.3.5, 9.2.3.1.1, 9.2.4.5.1)Voltage involved Minimum spacing between live parts of opposite polarity Minimum spacing throughair and over surfacebetween live parts
36、 andgrounded metalGreaterthanMaximum Through air Over surfacemm (in) mm (in)0 130 12.5 1/2 19.0 3/4 12.5 1/2130 250 19 3/4 31 1-1/4 12.5 1/2250 600 25 1 50 2 25a1a601 1000 25 1 50 2 25a1aaA through air spacing of not less than 12.5 mm (1/2 in) may be used:1) At a circuit breaker or a switch, other t
37、han a snap switch;2) Between uninsulated live parts of a meter mounting base and grounded metal; and3) Between grounded metal and the neutral of a 3-phase, 4-wire switchboard.NOTE 1 Exceptions to these minimum spacings are covered in 8.1.16.2 8.1.16.6 and Table 7.NOTE 2 The SI units are minimum valu
38、es and are not a direct conversion from the corresponding values in inches.OCTOBER 14, 2016 UL 891A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 7Instrument or control circuit spacings(8.1.16.2, 8.1.16.3, 8.1.16.6, 8.1.16.7, 8.1.16.8
39、, 8.1.17.5, 8.7.1.2.1 and Table 6)Voltage involved Minimum spacingsBetween uninsulated live parts of opposite polarity andbetween an uninsulated live part and an exposed oruninsulated metal part other than the enclosureBetween uninsulated liveparts and the walls of a metalenclosure, including fittin
40、gsfor conduit or armored cableMore than Maximum Through airaOver surface Shortest distancemm (in) mm (in) mm (in)0 150 3.2 1/8 6.4 1/4 12.5 1/2150 300 6.4 1/4 9.5 3/8 12.5 1/2300 600 9.5 3/8 12.5 1/2 12.5 1/2601 1000 9.5 3/8 12.5 1/2 12.5 1/2aThe spacing between wiring terminals of opposite polarity
41、 shall not be less than 6.4 mm (1/4 in) in any case if the terminalsare in the same plane. A metal piece attached to the enclosure shall be considered to be a part of the enclosure for thepurpose of this footnote if deformation of the enclosure is likely to reduce the spacing between the metal piece
42、 and a live part.11 FiguresSection 11 of UL 891 applies without modification.OCTOBER 14, 2016UL 891A8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSUPPLEMENT SA - Use of Components Not UL Listed or RecognizedSupplement A of UL 891 applies wi
43、thout modification.OCTOBER 14, 2016 UL 891A SA1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891ASA2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM
44、 ULAppendix A Standards for ComponentsAppendix A of UL 891 applies without modification.OCTOBER 14, 2016 UL 891A A1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891AA2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI
45、ZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAppendix B Standards Referenced in the Trinational Switchboard StandardAppendix B of UL 891 applies without modification.OCTOBER 14, 2016 UL 891A B1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WIT
46、HOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891AB2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAppendix C Markings Required to be Translated and Suggested French TranslationsAppendix C of UL 891 does not apply.OCTOBER 14,
47、2016 UL 891A C1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891AC2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAppendix D Example of Series S
48、hort-Circuit Current Rating MarkingAppendix D of UL 891 applies without modification.OCTOBER 14, 2016 UL 891A D1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891AD2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED
49、 FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAppendix E Example of Terminal Torque MarkingAppendix E of UL 891 applies without modification.OCTOBER 14, 2016 UL 891A E1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2016UL 891AE2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAppendix F Short-Circuit Test at Reduced VoltageAppendix F of UL 891 applies without modification
