1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): QVRQ2Standard Number: UL 2367Edition Date: December 30, 2009Edition Number: 1Section / Paragraph Reference: Table 1.1, Table 1.2, 1.6, 9B, 22.3Subject: Evalu
3、ation of Special Purpose Solid-State Overcurrent Protectors (ICCurrent Limiters) for Use as Limited Power Source (LPS) LimitersDECISION:1.1 This standard covers solid-state overcurrent protectors. These devices are solid-state switches thatlimit the output current to a safe level when the output loa
4、d exceeds the current-limit threshold or when aload-side short-circuit is present. Solid-state overcurrent protectors are intended to be used on theload-side of an isolating transformer, power supply or battery to provide a means of supplementaryprotection. See Tables 1.1 and 1.2 for limited power s
5、ource (LPS) limitations; see also Section 9B. SeeTable 1.1 for maximum current and power levels.Table 1.1Maximum current and power levelsOutput voltage (Voc) Output current (Isc)VacVdcA (VA) 20 20 1000 / Voc 25020 Voc 30 20 Voc 30 1000 / Voc 250 30 Voc 60 1000 / Voc 250Table 1.1Limited Power Source
6、LimitationsOvercurrent Protection Not RequiredOutput VoltageaOutput currentb, dApparent powercd(V) (I) (S)V (AC) V (DC) A VA 20 20 8.0 5.0xVe20 V 30 20 V 30 8.0 100 30 V 60 150/V 100aV: The maximum output voltage regardless of load with rated input appliedbI: Maximum output current with any non-capa
7、citive load, including a short-circuit.cS (VA): Maximum output VA with any non-capacitive load.dMeasurement of I and S are made 5 s after application of the load if protection is by an electronic circuit or a positivetemperature coefficient device, and 60 s in other cases.eThis line item is not appl
8、icable to CSA/UL 60950-1.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 1.2Limited Power Source LimitationsOvercurrent Protection RequiredOutput voltageaOutput currentbdApparent powercCurrent rating ofovercurrent protectivedevicee(V) (I
9、) (S)V (AC) V (DC) A VA A20 20 5 250 5.020V30 20V60 1,000/V 250 100/ VaV: The maximum output voltage regardless of load with rated input appliedbI: Maximum output current with any non-capacitive load, including a short-circuit.cS (VA): Maximum output VA with any non-capacitive load.dMeasurement of I
10、 and S are made 5 s after application of the load if protection is by an electronic circuit or a positivetemperature coefficient device, and 60 s in other cases.eThe current ratings of overcurrent protective devices are based on fuses and circuit-breakers that break the circuit within 120s with a cu
11、rrent equal to 210% of the current rating specified in the table.1.6 The devices covered by these requirements limit output currents to values less than the overcurrentprotection rating of 5 amperes.9B Limited Power Source (LPS)9B.1 A device, output or terminal marked or otherwise identified as prov
12、iding a Limited Power Source asdefined in the National Electrical Code (NEC), NFPA 70 shall limit the current and power to those levelsspecified either in Table 1.1 or Table 1.2.9B.2 Following each of the tests specified in this Standard, the device shall comply with the limits specifiedin the appro
13、priate Table noted in 9B.1.22.3 Those devices complying with the requirements of Section 9B are permitted to be marked:a) “ Limited Power Source Overcurrent Protection Not Required”, “LPS-OCP Not Required” orthe equivalent for those devices that comply with the limits specified in Table 1.1 orb) “Li
14、mited Power Source (Overcurrent Protection Required)”, “LPS-OCP Required” or theequivalent for those devices that comply with the limits specified in Table 1.2RATIONALE FOR DECISION:UL 60950-1 provides that:2.5 P.2 NAE Limited power sourcesA limited power source shall comply with one of the followin
15、g, a), b, c) or d):a) the output is inherently limited in compliance with Table 2B; orb) a linear or non-linear impedance limits the output in compliance with Table 2B. If a positivetemperature coefficient device is used, it shall pass the tests specified in IEC 60730-1, Clauses15, 17, J.15 and J.17
16、; orSTANDARD NUMBER: UL 2367 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULc) a regulating network limits the output in compliance with Table 2B, both with and without asimulated single fault (see 1.4.14) in the regulating network (open c
17、ircuit or short-circuit); ord) an overcurrent protective device is used and the output is limited in compliance with Table2C.Where an overcurrent protective device is used, it shall be a fuse or a non-adjustable, non-autoreset,electromechanical device.This decision provides that special purpose soli
18、d-state overcurrent protectors may be evaluated to serveas a LPS limiter (in compliance with the NEC with UL 60950-1 and with other Standards requiring aLimited Power Source) where they are:a) Intended to be used on the load-side of an isolating transformer or power supply or a battery,b) Designed f
19、or factory wiring only, andc) Evaluated to meet Table 1.1 or Table 1.2 limits both before and after abnormal conditions tobe allowed to designate outputs as LPS.Copyright 2010 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warra
20、nt thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal inter
21、pretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, aris
22、ing out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 2367 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 2367 -4-No Text on This Page
