1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMarch 6, 20081SUBJECT 2564OUTLINE OF INVESTIGATIONFORLOW-VOLTAGE SURGE WITHSTAND TELECOMMUNICATIONSOVERCURRENT PROTECTOR COMPONENTSISSUE NO. 1MARCH 6, 2008Summary of TopicsThis first issue of the
2、 Outline of Investigation for Low-Voltage SurgeWithstand Telecommunications Overcurrent Protector Components,Subject 2564, applies to cartridge, leaded and surface mount low-voltage,lightning surge withstand overcurrent protectors used in central office,outside plant, remote site and customer premis
3、es telecommunicationsequipment.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2008 UNDERWRITERS LABORATORIE
4、S INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMARCH 6, 2008SUBJECT 25642No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSPart 1: General Requirements1.
5、0 General 51.1 Scope .51.2 Components .71.3 Units of measurement .71.4 Undated references .72.0 Definitions and Symbols 72.1 Definitions .72.2 Symbols 103.0 Service Environment Conditions .104.0 Classification 135.0 Characteristics .145.1 Key parameters .145.2 DC Resistance 155.3 Maximum continuous
6、operating voltage rating .155.4 Maximum limited duration voltage rating 155.5 Maximum continuous current (Imco) Hold current (Ih) 155.6 Limited duration current carrying verification 155.8 Maximum limited duration fault current carrying rating 165.9 Current surge impulse withstand test 165.10 Voltag
7、e, current and time characteristics by template .166.0 Marking .187.0 Tests .187.1 General 187.2 Maximum continuous current (Imco) Hold current (Ih) 217.3 Limited duration current carrying rating Current vs. Time Characteristics .227.4 Maximum limited duration fault current rating .237.5 Surge curre
8、nt (Impulse) testing 267.6 Surge current impulse coordination testing .28Normative Annex A Protector TemplatesA1 Scope .A1A2 Samples A1A3 Templates .A1A3.1 Template (Derived from Table A1) .A1A3.2 Template B (Derived from Table A2) .A3A3.3 Template C (Derived from Table A3) .A4A3.4 Template D (Deriv
9、ed from Table A4) .A6A3.5 Template E (Derived from Table A5) .A7A3.6 Template F (Derived from Table A6) .A9A3.7 Template G (Derived from Table A7) A10A3.8 Template H (Derived from Table A8) A12A3.9 Template for Type I (Derived from Table A9) .A13MARCH 6, 2008 SUBJECT 2564 3UL COPYRIGHTED MATERIAL NO
10、T AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNormative Annex BNormative Annex C Impulse Waveform RequirementsWaveform tolerance and definitionInformative Annex D Background on System and Template DesignationsMARCH 6, 2008SUBJECT 25644UL COPYRIGHTED MATERIAL NOT AUTH
11、ORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPart 1: General Requirements1.0 General1.1 Scope1.1.1 This document applies to cartridge, leaded and surface mount low-voltage, lightning surgewithstand overcurrent protectors used in central office, outside plant, remote site
12、and customer premisestelecommunications equipment.1.1.2 These protectors, such as fuses, line feed resistors, electronic current limiters and positivetemperature coefficient thermistors, are intended for use in circuits to be electrically connected to atelecommunication network that has an operating
13、 voltage to ground of not greater than 150 Vac, and anoperating dc voltage to ground of not greater than 200 Vdc(400 Vdcbetween conductors).1.1.3 All protectors complying with the requirements of this standard are capable of safely clearingexternally sourced faults up to 600 Vrms, with prospective l
14、imited duration source currents of up to 60 Arms.Ratings applicable to a specific protector are provided in the applicable Template, see Normative AnnexA.1.1.4 Protectors complying with the requirements of this standard are capable of withstandingcommon-mode lightning surges as defined in the relate
15、d tables in this standard without causingpermanent opening or shorting of the device and without sustaining damage that will affect compliancewith the appropriate end-product requirements. In addition, protectors complying with the requirements ofthis standard are capable of withstanding higher leve
16、l lightning surges defined in the end productrequirements specified for a particular design template.1.1.5 This document only covers protectors to be employed with wire line paired cabletelecommunications ports (including Ethernet), but does not cover protectors used for other ports, such ascoaxial
17、cable telecommunications ports or AC power ports.1.1.6 A template defines the maximum current-time curve that a given wire size can safely withstandwithout damage or degradation. (See Table 1) The protector must interrupt, limit or reduce the circuitcurrent before the current value for a given time
18、is exceeded when tested at the rated voltage.1.1.7 These protectors shall not be employed in other than telecommunications circuits for which theyhave been specifically designed unless evaluated to another standard. Acceptable applications aresummarized in Table 1.1.1.8 Ambient chemical and environm
19、ental contamination conditions (e.g. salt spray, potentially explosiveor corrosive gases, excessive mechanical shock and vibration) are beyond the scope of this standard.MARCH 6, 2008 SUBJECT 2564 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM
20、 ULTable 1 List of templatesTemplate Port connectionA Use: GR-1089-CORE outside lineMaximum Limited Duration Fault Current: 60 A, Voltage Group I, II, or IIISurge Withstand: 100A, 10 /1000 s; 500A, 2/10 sB Use: GR-1089-CORE outside line connected with 26 AWG or coarserMaximum Limited Duration Fault
21、Current: 60 A, Voltage Group I, II, or IIISurge Withstand: 100A, 10/1000 s; 500A, 2/10 sC Use: GR-1089-CORE Intra-building lineMaximum Limited Duration Fault Current: 25A, Voltage Group IVSurge Withstand: 100A, 2/10 s and 1500V, 100A, Combination Wave GeneratorD Use: GR-1089-CORE Intra-building line
22、 High current connected to equipment with manufacturerspecified AWG direct wiringMaximum Limited Duration Fault Current: 25A, Voltage Group IVSurge Withstand: 100A, 2/10 s and 1500V, 100A, Combination Wave GeneratorE Use: UL 60950-1 outside line, fire enclosure used (100A2-Sec Maximum)Maximum Limit
23、ed Duration Fault Current: 40A, Voltage Group ISurge Withstand: TIA 968 1500V, 37.5A, 10/700F Use: UL 60950-1 outside line, fire enclosure used (1.3A)Maximum Limited Duration Fault Current: 40A, Voltage Group ISurge Withstand: TIA 968 1500V, 37.5A. 10/700G Use: UL 60950-1 outside line, passes all el
24、ectrical tests (special construction requirements)UL 1459 (for use with external secondary protector)Maximum Limited Duration Fault Current: 40A, Voltage Group ISurge Withstand: TIA 968 1500V, 37.5A, 10/700H Use: I-t characteristics in accordance with UL 1459, Fig 59.2UL 497A (standard premises wiri
25、ng systems)Maximum Limited Duration Fault Current: 40A, Voltage Group ISurge Withstand: TIA 968 1000V, 100A, 10/1000, 5000V, 500A, 2/10I Use: UL 1459 (special premises wiring systems) Protect 26 AWG wireUL 497A (special premises wiring systems)Maximum Limited Duration Fault Current: 25A, Voltage Gro
26、up ISurge Withstand: TIA 968 1500V, 200A 10/160 1500V, 100A, 10/5601.1.9 Refer to Informative Annex D for background on system and template designations.MARCH 6, 2008SUBJECT 25646UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1.2 Components1.
27、2.1 Specific components are incomplete in construction features or 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.1.3 Units o
28、f measurement1.3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.1.4 Undated references1.4.1 Any undated reference to a code or standard appearing in the requirements of this outline shall beinterpreted as referring to the late
29、st edition of that code or standard.2.0 Definitions and SymbolsThe following definitions and symbols apply in this Standard. When the terms voltage (Vac) and current (I)are used they imply the RMS values, unless otherwise specified.2.1 Definitions2.1.1 General for all protectors2.1.1.1 Ceramic Posit
30、ive Temperature Coefficient Thermistor (CPTC)A thermistor constructed of ceramic semiconductor material, which exhibits a step-like increase of afactor of 100 or more in resistance with increasing temperature.Note: CPTC thermistors covered by this document are intended for use as current limiting pr
31、otection elements.2.1.1.2 Current Interruption (7.1.5.1)The act of reducing current to a predetermined level, or zero, to protect a circuit and its components.2.1.1.3 Current LimiterNon-linear device that automatically restricts the value of current when the current attempts to exceed agiven value f
32、or a sufficient time2.1.1.4 Design TemplateSpecific description, including use, associated equipment standard, current limiting level and surgewithstand capabilities.2.1.1.5 DUTAbbreviation Device Under Test2.1.1.6 Electronic Current Limiter (ECL)Protection device which electronically limits current
33、s above a specific threshold current.MARCH 6, 2008 SUBJECT 2564 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.1.1.7 Fire EnclosureA part of the equipment intended to minimize the spread of fire or flames from within.2.1.1.8 FuseA protecti
34、ve device which opens a circuit during specified overcurrent conditions by means of a currentresponsive element.2.1.1.9 Fusing ResistorA resistor intended to interrupt a current flow at a predetermined time when the current passing throughit exceeds a predetermined value.Note: A Fusing Resistor is i
35、ntended to be replaced following operation.2.1.1.10 Hold current (Ih)See Maximum continuous current.2.1.1.11 Limited duration currentApplied current for a known maximum time period.NOTE: For this standard, limited duration time periods will be either 1.5 second or 5 seconds, maximum.2.1.1.12 Line Fe
36、ed Resistor (LFR)A fusing resistor used for AC overcurrent protection of telecommunications circuits.NOTE: An LFR may incorporate multiple resistive elements, thermal links, which melt and limit the maximum long-term temperaturerise, and PTC thermistor elements to give a self-restoring function at l
37、ow levels of AC. After fusing, the LFR has a permanentincrease of resistance value exceeding 100 times the original resistance.2.1.1.13 Maximum continuous current (Imco) Sometimes referred to as Hold current (Ih)Highest current that may be conducted by the protector without operation or permanent de
38、gradation atspecified ambient temperature.2.1.1.14 Maximum continuous operating voltage (Vmco)Maximum continuous DC source voltage of the circuit in which the protector will be installed.Note: This term ignores telecommunications alerting signals.2.1.1.15 Maximum limited duration fault current (Ildf
39、)The highest prospective rms symmetrical alternating current that a protector will safely interrupt underspecified conditions and for the defined duration at the maximum limited-duration voltage (Vmld) and isthe highest value shown in the appropriate current-time template.MARCH 6, 2008SUBJECT 25648U
40、L COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.1.1.16 Maximum limited duration voltage (Vmld)Maximum rms symmetrical alternating voltage to which the protector will be subjected during faultconditions for a specified minimum time duration.NO
41、TE 1: Maximum limited duration voltage (Vmld) is typically greater than Maximum continuous operating voltage (Vmco).NOTE 2: Typically, the minimum specified fault duration is either 1.5 or 5 seconds.NOTE 3: Maximum limited duration voltage (Vmld) is selected from the Voltage Group, Clause 4.1.2, ass
42、ociated with a givenTemplate.2.1.1.17 Maximum test duration time (ts)Maximum time for application of a test current or voltage.2.1.1.18 MicroclimateImmediate environment of the device.2.1.1.19 Polymer Positive Temperature Coefficient Thermistor (PPTC)A thermistor constructed of polymeric composite m
43、aterial, which exhibits a step-like increase of a factorof 100 or more in resistance with increasing temperature.Note: PPTC thermistors covered by this document are intended for use as current limiting protection elements2.1.1.20 Prospective currentCurrent which would flow at a given location in a c
44、ircuit if it were short-circuited at that location by a linkof negligible impedance.2.1.1.21 Surge CurrentA transient current which rises rapidly to a peak value and then falls more slowly to zero.2.1.1.22 Surge Current (Impulse) Withstand RatingMaximum current surge waveform the DUT will safely wit
45、hstand without loss of function after repeatedpredefined current surge impulses.2.1.1.23 Surge VoltageA transient voltage which rises rapidly to a peak value and then falls more slowly to zero.2.1.1.24 Trip Current (It)Lowest current which will cause the thermistor to trip to a high resistance condi
46、tion at a specifiedtemperature (preferably 23C) and within a time to be specified.MARCH 6, 2008 SUBJECT 2564 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.2 Symbols2.2.1 General symbols for all protectors2.2.1.1 Surge withstand overcurren
47、t protectorThe symbol, as shown in Figure 1, is used within this standard to represent all surge withstandovercurrent protectors.This is generated text for figtxt.3.0 Service Environment Conditions3.1 Requirements of this document are based on protectors being used in a controlled microclimate, anun
48、controlled microclimate or in special environmental conditions as declared in 4.0 by the protectormanufacturer. Those protectors intended for use in special environmental conditions shall be tested asdescribed in Section 3.3 but instead of -40C and +85C the environmental limits used in each test sha
49、llbe those declared by the protector manufacturer.3.1.2 The limit curves shown on the templates in Annex A are a function of temperature. Consequently,these limit curves shall be adjusted for temperature using the following temperature derating table valuesappropriate for the technology of the device under test: See Table 2Refer to Informative Annex D for further discussion related to temperature derating.Figure 1 Circuit symbol for a generic surge withstand overcurrent protectorMARCH 6, 2
