1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJUNE 29, 20181UL 3801Outline of Investigation for Fault LimitersIssue Number: 1June 29, 2018Summary of TopicsThis First issue of the Outline of Investigation for Fault Limiters, UL 3801covers fau
2、lt limiters.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 ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain
3、the sole and exclusive property of ULLLC.COPYRIGHT 2018 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJUNE 29, 2018UL 38012No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMI
4、SSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Units of Measurement .54 Undated References 55 Glossary .5CONSTRUCTION6 General 57 Control Boxes 68 Internal Control and Secondary Wiring .69 External Wiring .610 Creepage and Clearance Distance .611 Operation .7RATINGS12 General .7MARKINGS1
5、3 General .8INSTRUCTIONS14 General .8PERFORMANCE15 General .816 Verification of Temperature Rise and Current Carrying Capacity .917 Verification of Operation at Rated Voltage .1118 Verification of Short-Time Current Capability .1119 Verification of Short-Circuit Withstand Current 1220 Verification o
6、f Electromagnetic Compatibility .1221 Software Process Verification 13APPENDIX AStandards for ComponentsA1JUNE 29, 2018 UL 3801 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover fault limiters int
7、ended to sense and interrupt high magnitude overcurrentconditions in a prescribed range of short circuit current values, limiting both the time and peak current ofthe short circuit. Fault Limiters open the circuit within an interval equal to or less than the first major orsymmetrical current loop du
8、ration; limiting the peak current to a value less than the available peak current.1.2 Fault Limiters may be designed such that the interrupting portions are field replaceable.1.3 These requirements cover Fault Limiters rated up to 1000 V ac maximum.1.4 These requirements are intended to be used in c
9、onjunction with the requirements in the Standard forLow-Voltage Fuses Part 1, General Requirements, UL 248-1, hereafter referred to as UL 248-1, exceptas modified or supplemented by this Outline of Investigation, hereafter referred to as Outline.1.5 This Outline does not include the requirements for
10、 devices that sense and interrupt overcurrentconditions solely by use of a current responsive element. Requirements for these types of devices can befound in the UL 248 Series of Fuse Standards.1.6 Devices covered by this Outline are not intended to be used as branch circuit overcurrent protection.1
11、.7 Fault Limiters are intended for installation in switchgear, switchboards, and the like or in locationsaccessible only to qualified personnel in accordance with the NFPA 70, “National Electric Code” (NEC).The acceptability of the combination of a Fault Limiter with respect to any end product shall
12、 be determinedas part of the end-product evaluation.1.8 This standard does not cover effects of excessive sound or pressure.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 require
13、d to comply with a specific requirement 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
14、the intended conditions ofuse.2.4 Specific 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 s
15、pecific conditions.JUNE 29, 2018UL 38014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.4 Undated
16、References4.1 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.5 Glossary5.1 For the purpose of this outline, the following definitions supplement the definitions shown in UL 248-
17、1.Note that not all definitions in UL 248-1 are applicable to Fault Limiters covered by this Outline.5.2 CONTROL BOX An enclosure housing control components of the Fault Limiter.5.3 TRIGGER LEVEL The predetermined current level, rate of rise of current, integrated logic, or anycombination of these,
18、as defined by the manufacturer, where the current interrupting sequence is initiated.5.4 TRIGGER LOGIC The control components that determine whether interrupting functionality of theFault Limiter is initiated based on the input from the current sensing device.CONSTRUCTION6 General6.1 Fault limiters
19、generally sense and interrupt the short circuit current as follows:6.2 Fault limiters generally sense and interrupt the short circuit current as follows:a) Current transformers or other current sensing device sense the current, and send an outputto a control box, which may be integral to, or remote
20、from, the main portion of the fault limiter,andb) The control box initiates the interrupting sequence based on predetermined current level, rateof rise of current, integrated logic, or any combination of these, as defined by the manufacturer,signaling the interrupters to interrupt the circuit.JUNE 2
21、9, 2018 UL 3801 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Control Boxes7.1 Control boxes used with Fault Limiters shall be complete enclosures that comply with the enclosurerequirements of the Standard for Enclosure for Electrical Equ
22、ipment, Non-Environmental Considerations,UL 50.7.2 Control boxes may be assigned one or more enclosure type designations. The devices shall complywith the requirements of the Standard for Enclosure for Electrical Equipment, EnvironmentalConsiderations, UL 50E for each assigned type designation when
23、installed.8 Internal Control and Secondary Wiring8.1 An insulated conductor provided as part of a control circuit or secondary wiring shall be rated for theparticular application and shall have an ampacity not less than the continuous current rating of the circuitin which it is connected. Where load
24、s are of an intermittent nature, such as in trip circuits, conductors shallbe sized to provide their intended function with respect to voltage drop and mechanical strength.8.2 Wiring shall be located or protected to prevent contact with any sharp edge or moving part that coulddamage the insulation.8
25、.3 Insulated conductors shall be separated from wiring and uninsulated live parts connected to othercircuits, unless both circuits are provided with insulation rated for the highest voltage.9 External Wiring9.1 External wiring used for interconnection of control boxes shall comply with the Standard
26、for IndustrialControl Equipment, UL 508, for external interconnections and supply connections.10 Creepage and Clearance Distance10.1 No minimum creepage or clearance distances are specified for the interrupting portion of FaultLimiters.10.2 Creepage and clearance distances between live parts of Faul
27、t Limiters and grounded dead metalparts shall comply with the Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear,UL 1558, Table 12.1 for the voltage rating involved.10.3 Creepage and clearance distances within control circuits of Fault Limiters shall comply with thecreepage and
28、 clearance distance requirements of the Standard for Industrial Control Equipment, UL 508.10.4 Creepage and clearance distances within components used with the Fault Limiters shall comply withthe creepage and clearance distances specific to that component.JUNE 29, 2018UL 38016UL COPYRIGHTED MATERIAL
29、 NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL11 Operation11.1 Devices that have provisions for disabling the interrupting function shall have provisions for local andremote indication that the device has been disabled.11.2 Local indication shall be provided using
30、 an indicating LED or lamp.11.3 Remote indication shall be provided using one or more of the following means:a) An auxiliary switch or relay.b) Signaling through a SCADA system.11.4 Fault Limiters may be provided with visual or remote indication that circuit interruption has occurred.RATINGS12 Gener
31、al12.1 Fault Limiters shall have the following ratings:a) Maximum rated voltage;b) Continuous current rating;c) Maximum fault current;d) Minimum trigger level fault current (if a minimum current is required for proper operation);e) Rated control voltage;f) Control Box Enclosure type rating(s), where
32、 applicable;g) Short time current (required where the sensing and interrupting functionality can be turnedoff).12.2 The preferred continuous current ratings are 600, 800, 1600, 2000, 3000, 3200, 4000 or 5000amperes.JUNE 29, 2018 UL 3801 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
33、N ORDISTRIBUTION WITHOUT PERMISSION FROM ULMARKINGS13 General13.1 Devices shall be marked with the complete electrical ratings identified in 12.1. The marking shall beon a portion of the interrupter assembly that is not intended to be replaceable in the field.13.2 If a manufacturer produces or assem
34、bles Fault Limiters at more than one factory, each finishedsection shall have a distinctive marking, that may be in code, by which it may be identified as the productof a particular factory.13.3 Each control box shall be marked to identify it as part of the Fault Limiter, “Control Box only for Fault
35、Limiter, Cat. No. _” or equivalent.13.4 Required markings shall be visible without opening a door or cover on the control box.13.5 Fault Limiters with interrupting functions that can be disabled shall be provided with markings thatclearly indicate if the function is enabled or disabled. See 11.1 11.
36、4.13.6 Field replaceable interrupters and fuse element shall have unique part numbers. The assembly shallbe marked with the interrupter and fuse element part numbers for proper field replacement.INSTRUCTIONS14 General14.1 Fault Limiters shall be provided with instructions for proper installation, op
37、eration, and maintenance.These instructions shall identify proper connection of all control boxes or other accessories that have beeninvestigated for use with each Fault Limiter, and shall provide details regarding the proper installation ofthese accessories. These instructions may be in the form of
38、 electrical schematics or drawings. Instructionsfor proper connection of remote indicators shall be included. Instructions shall also include the minimumphase to phase distance installation distance between Fault Limiters on different phases.PERFORMANCE15 General15.1 Fault Limiters shall be tested t
39、o demonstrate compliance with the performance requirements overthe range of possible settings, including minimum and maximum settings.15.2 For each design of Fault Limiter, the number of representative samples shall be as shown in UL248-1, Table 1.JUNE 29, 2018UL 38018UL COPYRIGHTED MATERIAL NOT AUT
40、HORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL16 Verification of Temperature Rise and Current Carrying Capacity16.1 Other than as noted in 16.2 16.5, Fault Limiters shall be subjected to a continuous current test inaccordance with UL 248-1. During this test, the device sh
41、all carry 100 percent of rated current shall:a) Not ignite materials or components;b) Not cause the temperature limits of surfaces, materials, or components, as described inTable 16.1, to be exceeded;c) Not cause creeping, distortion, sagging, charring or similar damage to any part of theproduct, if
42、 such damage or deterioration may impair the performance of the product under therequirements of this standard; ord) Not cause the fusible element to open.Table 16.1Limits of temperature rise for various parts and materialsCategory Part, material, or place of temperature measurementsRiseC1 Insulated
43、 wire and cable (-)b2 Field-wiring terminalsc503 Class 90 insulation systems:Thermocouple method 50Resistance method 704 Buses and connecting straps 655 Class 105 insulation systems:Thermocouple method 65Resistance method 856 Class 130 insulation systems:Thermocouple method 85Resistance method 1057
44、Class 180 insulation systems:Thermocouple method 125Resistance method 1608 Class 105 insulation system on single-layer series coil with exposed surfaces either uninsulated orenameled, thermocouple method909 Phenolic compositiona12510 External surfaces:Accessible parts normally handled by the operato
45、rd20Accessible surfaces not normally handled by the operatord30External surfaces not normally accessible to the operator 70aThe limitation on phenolic insulation does not apply to compounds that have been investigated and found to have specialheat-resistant properties.bThe maximum allowable temperat
46、ure rise shall not exceed the maximum operating temperature for the wire in question minusan assumed ambient (room) temperature of 40C.cThe temperature on a wiring terminal or lug is measured at the point most likely to be contacted by the insulation of aconductor installed as in actual service.dInt
47、errupters and fuse elements are allowed to exceed these limits, but shall not exceed the limits for external surfaces notnormally accessible to the operator.16.2 For Fault Limiters rated above 600 A, the following applies.JUNE 29, 2018 UL 3801 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
48、ODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULa) The major axis of the Fault Limiter shall be horizontal , unless otherwise specified by themanufacturer. Each terminal of the Fault Limiter shall be connected to a copper bus bar whosewidth and overall thickness is the same as the bus of the Fault
49、 Limiter. Mounting screw holesshall be provided in the bus bar to correspond with those of the Fault Limiter to be tested.b) As an alternative to the connection noted in (a), the Fault Limiter may be connected usingconductors with an ampacity that corresponds to the continuous current rating of the FaultLimiter based on Table 16.2.Table 16.2Ampacity of insulated conductorsWire sizeaCopper AluminumAWG (mm)21/0 (53.5) 150 1202/0 (67.4) 175 1353/0 (85.0) 200 1554/0 (107.2) 230 180250 (127) 255 205300 (152) 285 230350 (177) 310 250400 (203) 335 270500 (253) 380 310
