UL SUBJECT 489B-2014 UL Outline of Investigation for Molded-Case Circuit Breakers Molded-Case Switches and Circuit-Breaker Enclosures for Use with Photovoltaic (PV) Systems (Issue .pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSEPTEMBER 10, 20141UL 489BOutline of Investigation for Molded-Case Circuit Breakers, Molded-CaseSwitches, and Circuit-Breaker Enclosures for Use with Photovoltaic (PV)SystemsIssue No. 4September

2、10, 2014Summary of TopicsThis is the fourth issue of the Outline of Investigation for Molded-CaseCircuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosuresfor Use with Photovoltaic (PV) Systems that includes the followingchanges:Revised to increase voltage ratings to 1500VClarification o

3、f the requirement in 6.2Addition of 50 dc ampere Standard Fault Interrupting Rating to Table17.1Deletion of the Inclined Plane Tracking TestMiscellaneous editorial correctionsCOPYRIGHT 2014 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION W

4、ITHOUT PERMISSION FROM ULSEPTEMBER 10, 2014UL 489B2No 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-CA

5、SE CIRCUIT BREAKERSCONSTRUCTION6 General 67 Spacings .68 Wire Terminals .7PERFORMANCE9 General 810 Endurance Test 1111 Temperature Test .1112 100 Percent Calibration at 50C 1213 Limited Fault Interrupting Test 1214 Standard Fault Interrupting Test 1215 Dielectric Voltage-Withstand Test .12RATINGS16

6、General 13MARKINGS17 General 13MOLDED-CASE SWITCHESCONSTRUCTION18 General 15PERFORMANCE19 General 1520 Abnormal Current Opening Test 1621 Short Circuit Current Withstand Test 1622 Dielectric Voltage-Withstand Test .16SEPTEMBER 10, 2014 UL 489B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR

7、ODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULRATINGS23 General 17MARKINGS24 General 17ENCLOSURESCONSTRUCTION25 General 1726 Wiring Space .18PERFORMANCE27 Short Circuit Current Test 18RATINGS28 General 18MARKINGS29 General 19SEPTEMBER 10, 2014UL 489B4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FU

8、RTHER 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 1500 V dc, intended for use with photovoltaic (PV) systems and Article 690 of theNation

9、al 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 489, hereafterreferred to as UL 489, except as modified or supplemented by thi

10、s 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 requirement that:a) Involves a feature or characteristic not required in the applicati

11、on 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 Specific components are incomplete in construction features or restricted in pe

12、rformance 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 Measurement3.1 Values stated without parentheses are the requirement. Values in par

13、entheses are explanatory orapproximate information.SEPTEMBER 10, 2014 UL 489B 5UL 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 Outline sh

14、all 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 PHOTOVOLTAIC (PV) MOLDED-CASE CIRCUIT BREAKER A molded-case circuit breakerintended to operate in a photovoltaic (PV) system to provide bra

15、nch circuit overcurrent protection.5.3 PHOTOVOLTAIC (PV) CIRCUIT-BREAKER ENCLOSURE A circuit-breaker enclosure intendedfor use in a photovoltaic (PV) system.5.4 PHOTOVOLTAIC (PV) MOLDED-CASE SWITCH A molded-case switch intended to operate in aphotovoltaic (PV) system to provide disconnecting means.M

16、OLDED-CASE CIRCUIT BREAKERSCONSTRUCTION6 General6.1 The construction of a PV circuit breaker shall comply with the requirements as specified in Section6.1 of UL 489, except as noted in Sections68ofthis Outline as applicable.6.2 PV circuit breakers shall be considered as single poles for individual P

17、V sources or strings that mayuse multiple sets of contacts in series, unless marked in accordance with 17.5. See also 9.8.7 Spacings7.1 The electrical spacings for PV circuit breakers rated 600V or less shall meet the requirements ofSection 6.1.6 of UL 489. Those PV circuit breakers rated 601 1500V

18、shall meet the requirements of UL489 for 600V.SEPTEMBER 10, 2014UL 489B6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8 Wire Terminals8.1 A field wiring terminal of a PV circuit breaker shall have a capacity acceptable for the number, wiresi

19、ze, and type of stranding associated with the circuit breaker and in addition shall be acceptable for atleast the size indicated in Table 8.1.Table 8.150C ambient corrected conductor sizeTerminal currenta, A Copper conductorsb,cAluminum conductorsb,cNumber of conductors AWG or kcmil Number of conduc

20、tors AWG or kcmil15 or less 1 14 1 122011011051101 83018184 16145 14136014127 131180 1 2 1 1/090 1 1 1 1/0100 1 1/0 1 2/0110 1 1/0 1 3/0125 1 2/0 1 4/0150 1 3/0 1 250175 1 250 1 350200 1 300 1 400200 2 1/0 2 2/0225 1 350 1 500225 2 1/0 2 3/0250 1 400 1 600250 2 2/0 2 4/0275 1 500 1 700300 2 3/0 2 25

21、0325 2 4/0 2 300350 2 250 2 350350 3 2/0 3 4/0400 2 300 2 400450 2 350 2 500450 3 3/0 3 250500 2 400 2 600500 3 250 3 300550 2 500 3 350600 3 300 3 400700 3 400 3 500800 3 500 4 400800 4 300 5 3001000 4 400 4 6001200 5 400 6 4001200 6 300 8 2501200 4 600 5 6001400 5 500 6 500SEPTEMBER 10, 2014 UL 48

22、9B 7Table 8.1 Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 8.1 ContinuedTerminal currenta, A Copper conductorsb,cAluminum conductorsb,cNumber of conductors AWG or kcmil Number of conductors AWG or kcmil1400 6 400

23、 9 2501600 6 500 6 7001600 7 400 8 4002000 6 500 10 4002000 8 400 8 6002500 9 500 10 600aFor terminal current other than indicated, the next higher rating is to be used for example, if rated 35 A, enter at 40 A.bTable is based on 75C wire ampacities.cBased on 50C correction factor of Table 310.15(2)

24、(a) of the National Electrical Code, ANSI/NFPA-70.8.2 A PV circuit breaker may also be evaluated for use with PV wire or other class and strandconfigurations as indicated by marking. See 17.7.8.3 A wire terminal for a PV circuit breaker shall be evaluated for use with the wire type and stranding asm

25、arked on the device in accordance with Annex B, Ref. No. 6 of UL 489.PERFORMANCE9 General9.1 The representative device selection shall be as specified in Table 9.1. The performance shall be asspecified in UL 489 except as modified in Table 9.2 and Sections915ofthis Outline.Table 9.1Sample selectionF

26、rame rating Number of samples per sequenceaABC0 400A 3 3 3401 and higherb111aSee 9.5.bSee 9.6.SEPTEMBER 10, 2014UL 489B8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 9.2Test sequencesTest Reference SequenceABC135 percent calibration 7.

27、1.2.3 of UL 489 X X200 percent calibration 7.1.2.2 of UL 489 X X XEndurance 10 XTemperature 11 X100 percent calibrationat 50C12 XLimited fault interrupting 13 XStandard faultinterrupting14 XTrip-out at 200 percent 7.1.2.2 of UL 489 X XDielectric voltage-withstand15 XXX9.2 Representative devices shal

28、l be wired in accordance with the instructions of the PV circuit breakermanufacturer. See also 9.8 and 17.5.9.3 For the Endurance, Limited Fault Interrupting, and Standard Fault Interrupting Tests, the dc circuitshall have a time constant of not less than 1.0 msec.9.4 When a PV circuit breaker is ma

29、rked line and load in accordance with 17.10, the Endurance andTemperature Tests shall be conducted with the device wired in the normal (forward) direction. The LimitedFault Interrupting and Standard Fault Interrupting Tests shall be conducted in the reverse direction. TheCalibration and Trip-out Tes

30、ts may be conducted in any convenient direction.9.5 When a PV circuit breaker is not marked line and load in accordance with 17.10, for SequencesA, B, and C, one sample of the sample set, or an additional sample for each test set, shall be providedand tested with opposing line and load connections t

31、han that required in 9.4. When only one sampleconstitutes a set, a second sample is required for opposing line-load connection tests.Exception No. 1: 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 si

32、multaneously, testing in both the forward andreverse direction is not required.Exception No. 2: A circuit breaker constructed such that the contact(s) and arc suppression mechanismis symmetrical in design such that the direction of the current and resultant opposing magnetic field is nota factor in

33、the behavior of the arc, testing in both the forward and reverse direction is not required.9.6 When a PV circuit breaker has interchangeable trip units, one sample of the frame and three samplesof the trip unit shall constitute a set.9.7 For the purposes of this Outline, testing in the forward direc

34、tion requires the positive terminal of thesource to be connected to the normal line terminal of the device. Wiring in the reverse direction requiresthe positive terminal of the source to be wired to the normal load terminal of the device.SEPTEMBER 10, 2014 UL 489B 9UL COPYRIGHTED MATERIAL NOT AUTHOR

35、IZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.8 Each pole of a multipole PV circuit breaker shall be tested individually unless marked in accordancewith 17.5 and investigated in accordance with 9.9 of this Outline.9.9 A PV circuit breaker shall be connected in accordance w

36、ith the wiring instructions of themanufacturer. Multipole PV circuit breakers marked for more than one wiring configuration shall besubjected to a sufficient number of tests to represent all configurations. Examples:a) For interrupting tests, a configuration with the least number of poles energized

37、wouldrepresent configurations with more poles energized.b) For temperature tests, a configuration with the most number of poles energized wouldrepresent configurations with a fewer number of poles energized.c) Calibration tests shall be conducted on the configurations with both the most and leastnum

38、ber of poles energized.9.10 For the Endurance, Limited Fault Interrupting, and Standard Fault Interrupting Tests, a PV circuitbreaker intended for use on a system having one conductor grounded shall be tested with the enclosureor mounting surface connected to the negative conductor through a fuse as

39、 described in 7.1.1.21 of UL489.9.11 A PV circuit breaker shall be wired in accordance with 9.12 for the Interrupting Tests if the PV circuitbreaker complies with all of the following:a) Is a multi-pole type;b) Is marked for 2 or more poles to be wired in series;c) Is marked for use in a grounded sy

40、stem; andd) Requires a direct connection to both the grounded and ungrounded circuit conductors.9.12 The circuit breaker shall be wired to both the grounded and ungrounded circuit conductor of the teststation with the fewest number of poles intended to be connected in series in accordance with the c

41、ircuitbreaker instructions. The normal load terminal(s)/pole(s) intended to be connected to the grounded circuitconductor shall not be used, and instead the load side of the positive terminal shall be connected directlyto the grounded terminal of the test station.9.13 For a field wired PV circuit br

42、eaker, the wire used to connect to the terminal for the test in Section12 shall be sized in accordance with Table 8.1. For the test in Section 10, the wire may be sized basedon either the requirements of UL 489 or Table 8.1. When the tests in Sections 11 and 12 are combined,the wire shall be sized i

43、n accordance with Table 8.1.Exception: A circuit breaker not intended for wire connection shall be connected to copper bus bars inaccordance with 7.1 of UL 489.SEPTEMBER 10, 2014UL 489B10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL10 Endur

44、ance Test10.1 A PV circuit breaker shall be capable of performing successfully when subjected to the EnduranceTest specified in 7.1.5 of UL 489 at the maximum rated dc voltage specified for the circuit breaker. Thenumber of operations of the Endurance Test shall be in accordance with Table 10.1.10.2

45、 Prior to the Temperature Test, the PV breaker shall be subjected to at least 10 percent of therequired electrical operations and 100 percent of the mechanical operations of Table 10.1. Uponcompletion of the Temperature Test, the remaining electrical operations shall be completed beforeconducting th

46、e Trip-Out Test.Table 10.1Endurance testDevice rating No. of operationsWith load Without load249 A and less 1000 1000250 A and greater 400 40011 Temperature Test11.1 A PV circuit breaker shall be subjected to the Temperature Test as specified in Section 7.1.4 of UL489 except as noted in 11.2 and 11.

47、3.11.2 A PV circuit breaker shall not exceed the values in Section 7.1.4 and 7.6.5 of UL 489 except thetemperature rise limits shall be adjusted by subtracting 10C from the allowable rise.11.3 At the request of the manufacturer, the Temperature Test may be conducted in conjunction with the100 Percen

48、t Calibration Test described in Section 12, in which case the temperature rise limits shall notrequire the 10C correction factor described in 11.2.11.4 Fusible PV circuit breakers shall be tested with PV fuses in place. Testing with actual fuses is to beconducted at 80 percent rated current.11.5 A P

49、V circuit breaker rated 1001 1500V shall be rated for continuous operation at 100 percent ofits ampere rating in compliance with the requirements of 7.1.4.3 of UL 489.SEPTEMBER 10, 2014 UL 489B 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL12 100 Percent Calibration at 50C12.1 In addition to the Calibration Test specified in Section 7.1.2 of UL 489, a PV circuit breaker shall becapable of carrying rated current at 50C in accordance with 12.2.12.2 A PV circuit breaker shall be wired with