1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNOVEMBER 14, 20171UL 489HOutline of Investigation for Molded-Case Circuit Breakers, Molded-CaseSwitches, and Circuit-Breaker Enclosures, for Use with Direct Current (DC)MicrogridsIssue No. 1Novem
2、ber 14, 2017Summary of TopicsThis First issue of the Outline of Investigation for Molded-Case CircuitBreakers, Molded-Case Switches, and Circuit-Breaker Enclosures, for Usewith Direct Current (DC) Microgrids, covers molded-case circuit breakers,molded-case switches, and circuit-breaker enclosures ra
3、ted up to 1000V dc, intended for use with Direct Current (DC) Microgrid systems andArticle 712 of the National Electrical Code, ANSI/NFPA-70.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All
4、ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNOVE
5、MBER 14, 2017UL 489H2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSALL DEVICESINTRODUCTION1 Scope .52 Components 53 Units of Measurement .54 Undated References 65 Glossary .6MOLDED-CASE CIRCUIT BREAKERSCONSTRUCTIO
6、N6 General 6PERFORMANCE7 General 68 Interrupting Test 89 Dielectric Voltage-Withstand Test .8RATINGS10 General .8MARKINGS11 General .9MOLDED-CASE SWITCHESCONSTRUCTION12 General 10PERFORMANCE13 General 1014 Short Circuit Current Withstand Test 1015 Dielectric Voltage-Withstand Test .11RATINGS16 Gener
7、al 11MARKINGS17 General 11NOVEMBER 14, 2017 UL 489H 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULENCLOSURESCONSTRUCTION18 General 1119 Wiring Space .12PERFORMANCE20 Short-Circuit Current Test 12RATINGS21 General 12MARKINGS22 General 12NOVE
8、MBER 14, 2017UL 489H4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULALL DEVICESINTRODUCTION1 Scope1.1 These requirements cover molded-case circuit breakers, molded-case switches, and circuit-breakerenclosures rated up to 1000 V dc, intended f
9、or use with Direct Current (DC) Microgrid systems and Article712 of the National Electrical Code, ANSI/NFPA-70.1.2 These requirements are intended to be used in conjunction with the requirements in the Standard forMolded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures, UL
10、489, hereafterreferred to as UL 489, except as modified or supplemented by this Outline.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this Outline shall comply with therequirements for that component.2.2 A component is not required to comply with a specific requirem
11、ent that:a) Involves 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.2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.4 S
12、pecific 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 only under those specific conditions.3 Units of Measu
13、rement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.NOVEMBER 14, 2017 UL 489H 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Undated References4.1 Any undated ref
14、erence 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.5 Glossary5.1 For the purpose of this Outline, the following definitions apply.5.2 DIRECT CURRENT (DC) MICROGRID MOLDED-CASE CIRCUIT BREAKER A mo
15、lded-casecircuit breaker intended to operate in a DC microgrid system to provide branch circuit overcurrentprotection.5.3 DIRECT CURRENT (DC) MICROGRID CIRCUIT-BREAKER ENCLOSURE A circuit-breakerenclosure intended for use in a DC microgrid system.5.4 DIRECT CURRENT (DC) MICROGRID MOLDED-CASE SWITCH
16、A molded-case switch intendedto operate in a DC microgrid system to provide disconnecting means.MOLDED-CASE CIRCUIT BREAKERSCONSTRUCTION6 General6.1 The construction of a DC microgrid circuit breaker shall comply with the requirements as specified inSection 6.1 of UL 489, except as noted in 6.2 of t
17、his Outline as applicable.6.2 DC microgrid circuit breakers shall be considered as single poles for individual sources or loads thatmay use multiple sets of contacts in series, unless marked in accordance with 9.1.4.8 of UL 489. See also7.1.1.12 of UL 489.PERFORMANCE7 General7.1 The representative d
18、evice selection shall be as specified in Table 7.1. The performance shall be asspecified in UL 489 except as modified in Sections79ofthis Outline.NOVEMBER 14, 2017UL 489H6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 7.1Sample selectio
19、nFrame rating Number of samples per sequenceaXYZ0 400A 3 3 3401 and higherb111aSee 7.5.bSee 7.4.7.2 Representative devices shall be wired in accordance with the instructions of the DC microgrid circuitbreaker manufacturer. See also 7.1.1.9 of UL 489.7.3 When a DC microgrid circuit breaker is marked
20、line and load in accordance with 11.8, X- andY-Sequence tests shall be conducted with the device wired in the normal (forward) direction. TheInterrupting Tests shall be conducted in both the forward and reverse directions. The Calibration andTrip-out Tests may be conducted in any convenient directio
21、n.7.4 When a DC microgrid circuit breaker is not marked line and load in accordance with 11.8, forSequences X and Y, one sample of the sample set, or an additional sample for each test set, shall beprovided and tested with opposing line and load connections than that required in 7.3. When only onesa
22、mple constitutes a set, a second sample is required for opposing line-load connection tests.Exception: A circuit breaker that is required to be wired in series such that the same number of poles(contacts) are exposed to the current in both directions simultaneously, testing in both the forward andre
23、verse direction is not required.7.5 When a DC microgrid circuit breaker has interchangeable trip units, one sample of the frame andthree samples of the trip unit shall constitute a set.7.6 For the purposes of this Outline, testing in the forward direction requires the positive terminal of thesource
24、to be connected to the ON (top) end line terminal of the device. Wiring in the reverse directionrequires the positive terminal of the source to be wired to the OFF (bottom) end load terminal of thedevice.7.7 Each pole of a multipole DC microgrid circuit breaker shall be tested individually unless ma
25、rked inaccordance with 11.8 and investigated in accordance with 7.4.7.8 For those tests where the contacts will open at rated voltage, a DC microgrid circuit breaker intendedfor use on a system having one conductor grounded shall be tested with the enclosure or mountingsurface connected to the negat
26、ive conductor through a fuse as described in 7.1.1.27 of UL 489.NOVEMBER 14, 2017 UL 489H 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8 Interrupting Test8.1 A DC microgrid circuit breaker shall perform successfully when operated under con
27、ditions indicatedin 7.1.7 of UL 489 at the nominal rated voltage specified by the manufacturer, except that the prospectivecurrent shall be at the standard interrupting rating of the device. The operations shall be O CO O.Exception: The Interrupting Test may instead be conducted at a higher value as
28、 tabulated in Table 8.1of UL 489.9 Dielectric Voltage-Withstand Test9.1 DC microgrid circuit breakers shall be subjected to the Dielectric Voltage-Withstand Test specified in7.1.9 of UL 489 at the voltages specified in 9.2.9.2 The test potential shall be the following values for alternating-current
29、testing:a) 500 volts ac For DC microgrid products rated not more than 50 volts dc; andb) 1000 volts ac plus twice the rated voltage For DC microgrid products rated greater than 50volts dc.9.3 The test specified in 9.2 may be conducted with a dc source except the test potential shall be equalto a val
30、ue of 1.414 times that required in 9.2.RATINGS10 General10.1 In addition to the requirements of Section 8 of UL 489, a DC microgrid circuit breaker shall complywith 10.2 10.4.10.2 A DC microgrid circuit breaker shall be rated in amperes, interrupting current, and volts.10.3 A DC microgrid circuit br
31、eaker shall be rated for one or more one or more of the voltage ratings ofUL 489. “Slash” ratings are not permitted.10.4 The interrupting rating of a DC microgrid circuit breaker shall be a value no greater than theprospective current used during the Interrupting Test and shall be a value as tabulat
32、ed in Table 10.1.Exception: A DC microgrid circuit breaker additionally investigated to the high available fault currentsequence of 7.1.11 of UL 489 at a dc value as tabulated in Table 8.1 of UL 489, shall have an interruptingrating not to exceed the prospective current used during the test.NOVEMBER
33、 14, 2017UL 489H8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 10.1Standard fault interrupting ratings, dc amperes50 800 2,000100 1,200 3,000400 1,600 5,000MARKINGS11 General11.1 A DC microgrid circuit breaker shall be provided with th
34、e applicable required markings specified inSection 9 of UL 489, except as modified by this Outline.11.2 A DC microgrid circuit breaker shall be marked “DC Microgrid” or “MG.” Location Category B.11.3 A DC microgrid circuit breaker shall be marked with the nominal dc voltage rating. Location Category
35、B.11.4 A DC microgrid circuit breaker shall be marked with an interrupting rating in accordance with 10.4.Location Category B.11.5 A DC microgrid circuit breaker may be marked “Suitable For Use in DC Microgrid Systems inAccordance with Article 712 of the NEC.” Location Category C.11.6 If a DC microg
36、rid circuit breaker has ratings for other applications in accordance with UL 489, themarkings shall be clearly separate from the DC microgrid ratings.11.7 A DC microgrid circuit breaker shall be marked “line” and “load” as appropriate unless evaluated inaccordance with 7.4. A circuit breaker rated f
37、or forward current fed from the negative pole of a source shallbe marked “line (-)” and “load (+)”. Location Category C.11.8 A multipole DC microgrid circuit breaker shall be marked to indicate the proper configuration ofconnections of the terminals. The markings line, load, +, or -, shall be used a
38、s appropriate. See also 11.6.Location Category C.11.9 A DC microgrid circuit breaker shall be marked as being suitable for 75C (167F) wire only.Location Category B.11.10 A DC microgrid circuit breaker investigated using bus bars larger or smaller than those specified inTable 7.1.4.1.3 of UL 489, sha
39、ll be marked to show the minimum size bus bar with which it can be used.Location Category B.11.11 A DC microgrid circuit breaker shall be marked for either a grounded or ungrounded system, orboth (all grounding systems), as intended by the manufacturer. Location Category C.NOVEMBER 14, 2017 UL 489H
40、9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMOLDED-CASE SWITCHESCONSTRUCTION12 General12.1 The construction of a DC microgrid switch shall comply with the requirements of Section 10 of UL489, and as modified by Section 6 of this Outline.P
41、ERFORMANCE13 General13.1 The representative device selection shall be as specified in Table 7.1. DC microgrid switches shallcomply with the general performance requirements as specified in Section 11 of UL 489 except asmodified by Table 7.1, Sections79asapplicable, and 13 15 of this Outline.13.2 For
42、 a DC microgrid switch that is identical in ratings and construction to a DC microgrid circuitbreaker that complies with the requirements of this Outline, and in which the release element is eitheromitted or made inactive, only the Short Circuit Withstand Test sequence is required to be conducted.13
43、.3 For a DC microgrid switch that is identical in ratings and construction to a DC microgrid circuitbreaker that complies with the requirements of this Outline and in which the release element is eitheromitted or made inactive, except for the instantaneous release, no additional testing is required.
44、14 Short Circuit Current Withstand Test14.1 A DC microgrid switch shall perform successfully when operated under conditions indicated in 11.1.7of UL 489 except as modified by 14.2. The test shall be conducted at the nominal rated voltage and shortcircuit current rating in accordance with Table 10.1
45、of this Outline or Table 12.1 of UL 489.14.2 A DC microgrid switch shall withstand the designated current until the overcurrent protective deviceopens. For a DC microgrid switch not marked as requiring a specific DC microgrid circuit breaker or fuse,the test current shall be maintained for 0.050 sec
46、. or the time required for an instantaneous releasemechanism to respond.NOVEMBER 14, 2017UL 489H10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL15 Dielectric Voltage-Withstand Test15.1 The Dielectric Voltage-Withstand Test described in 9.1 s
47、hall be conducted following the Short CircuitCurrent Withstand Test.RATINGS16 General16.1 A DC microgrid switch shall comply with the requirements of Section 12 of UL 489, as modified by10.2 and 16.2.16.2 The short circuit current withstand rating of a DC microgrid switch is considered to be not gre
48、aterthan that value of the prospective current used during the test in Section 14 of this Outline or 11.1.7.2 ofUL 489.MARKINGS17 General17.1 A DC microgrid switch shall be provided with the applicable required markings specified in Section13 of UL 489, except as modified by 11.2, 11.3, 11.5 11.11,
49、and this Section.17.2 A DC microgrid switch shall be marked with a short circuit current rating not greater than theprospective current used in Section 8. Location Category B.Exception: A DC microgrid switch investigated with a test current in accordance with Table 12.1 of UL489 may be marked with a short circuit current rating not greater than the prospective current used in11.1.7 of UL 489.ENCLOSURESCONSTRUCTION18 General18.1 The construction of a DC microgrid circuit breaker enclosure shall comply with Section 18 of UL 489,except as modified by
