1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL 1437ISBN 0-7629-1252-9Electrical Analog Instruments Panel Board TypesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MAT
2、ERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUnderwriters Laboratories Inc. (UL)333 Pfingsten RoadNorthbrook, IL 60062-2096UL Standard for Safety for Electrical Analog Instruments Panel Board Types, UL 1437Fourth Edition, Dated December 12, 2006Summary of To
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20、e following theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.New product submittals made prior to a specified future effective date will be judged under a
21、ll of therequirements in this Standard including those requirements with a specified future effective date, unlessthe applicant specifically requests that the product be judged under the current requirements. However, ifthe applicant elects this option, it should be noted that compliance with all th
22、e requirements in thisStandard will be required as a condition of continued Recognition and Follow-Up Services after theeffective date, and understanding of this should be signified in writing.Copyright 2006 Underwriters Laboratories Inc.This Standard consists of pages dated as shown in the followin
23、g checklist:Page Date1-48 .December 12, 2006DECEMBER 12, 2006 UL 1437tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 12, 20061UL 1437Standard for Electrical Analog Instruments Panel Board TypesFirst Edition November, 1979Second Edi
24、tion March, 1993Third Edition April, 1998Fourth EditionDecember 12, 2006An effective date included as a note immediately following certain requirementsis one established by Underwriters Laboratories Inc.The Department of Defense (DoD) has adopted UL 1437 on October 3, 1994.The publication of revised
25、 pages or a new edition of this Standard will notinvalidate the DoD adoption.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on th
26、e transmittal noticethat accompanies the latest set of revised requirements. Comments or proposalsfor revisions on any part of the Standard may be submitted to UL at any time.Proposals should be submitted via a Proposal Request in ULs On-LineCollaborative Standards Development System (CSDS) at http:
27、/.ISBN 0-7629-1252-9COPYRIGHT 2006 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 12, 2006ELECTRICAL ANALOG INSTRUMENTS PANEL BOARD TYPES - UL 14372No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI
28、ZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .62 Glossary .83 Components 84 Units of Measurement .95 References .9CONSTRUCTION6 General 96.1 General .96.2 Component construction requirements 97 Enclosure and Insulating Materials 97.1 General .97.2
29、 Enclosure materials 107.3 Insulating materials 128 Accessibility of Live Parts .128.1 General 128.2 Determination of accessibility .128.3 Determination of electric shock 148.4 Instrument connection .148.5 Operator servicing .158.6 Operating shafts 158.7 Adjustment openings 159 Connection Devices 15
30、9.1 Terminals .159.2 Insulation .159.3 Protective ground terminals .169.4 Screw connections 1610 Internal Wiring 1611 Separation of Circuits .1711.1 General .1711.2 Printed-wiring boards .1712 Spacings 1712.1 Circuits 1712.2 Fasteners .1813 Grounding .1814 Component Parts and Accessories 1914.1 Resi
31、stors and inductors .1914.2 Component short-circuit .1914.3 Overcurrent protective and thermal-limiting devices .1914.4 Accessories .1915 Subdivision of Circuits Into Groups 1915.1 General .1915.2 Open-circuit voltage measurement .2015.3 Available-current measurement 2015.4 Current-limiting means 20
32、15.5 Overload-protector rating 2015.6 Fixed-impedance rating .23DECEMBER 12, 2006 ELECTRICAL ANALOG INSTRUMENTS PANEL BOARD TYPES - UL 1437 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL15.7 Regulating-network rating .23PERFORMANCE16 Genera
33、l 2316.1 General .2316.2 Voltmeter sensitivity 2316.3 Cheesecloth indicators 2316.4 Reference test conditions (reference conditions for test purposes) 2416.5 Protective devices 2516.6 Voltage and current 2517 Leakage Current Test .2517.1 General .2517.2 Specified measuring instrument 2617.3 Instrume
34、nt connection 2717.4 Enclosure of insulating material 2718 Normal Temperature Test 2818.1 General .2818.2 Instrument mounting 2918.3 Instrument connections .2918.4 Doors and covers 2918.5 Thermocouples 2918.6 Temperature limits 2919 High-Ambient Temperature Evaluation 3019.1 Instrument conditioning
35、.3019.2 Insulating materials .3019.3 Polymeric enclosures .3020 Insulation Voltage Test (Dielectric Voltage-Withstand Test) 3020.1 General .3020.2 Indication of breakdown .3121 Humidity Conditioning .3121.1 General .3121.2 Preconditioning 3121.3 Conditioning .3222 Torque Test for Terminals .3222.1 G
36、eneral .3222.2 Direction and application of torque .3223 Testing Under Fault Conditions .3323.1 General .3323.2 Fire .3523.3 Electric shock 3523.4 Protective devices and circuit components 3523.5 Fault conditions 3523.6 Multi-function and over-range test 3724 Polymeric Enclosure Stress-Relief Distor
37、tion .3724.1 General .3724.2 Test criteria 3824.3 Test procedure .3825 Enclosure Impact Test (Does Not Apply to Windows) .3825.1 General .3825.2 Test procedure .3925.3 Alternate enclosure impact test 4126 Window Impact .41DECEMBER 12, 2006ELECTRICAL ANALOG INSTRUMENTS PANEL BOARD TYPES - UL 14374UL
38、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL26.1 General .4127 Polymeric-Enclosure Pressure 4227.1 General .4227.2 Test procedure .4328 Window Pressure .4328.1 General .4328.2 Test method .43MANUFACTURING AND PRODUCTION TESTS29 General 4329.1
39、 General .4329.2 Test equipment 43MARKINGS30 Details .4430.1 General requirements .4430.2 Manufacturers identification .4430.3 Model identification .4430.4 Factory identification 4430.5 Voltage measuring or testing terminal rating .4430.6 Current measuring terminal rating 4530.7 Isolated measuring t
40、erminal rating 4530.8 Polarity .4530.9 Edgewise instruments .4530.10 Radio-frequency instruments .4530.11 Scale marking 4530.12 External accessories 4631 Caution and Warning Notices 4631.1 Protective ground terminals 4631.2 Markings requiring explanations 4631.3 Fuse-replacement caution markings 473
41、1.4 Protective-device-replacement caution marking 47DECEMBER 12, 2006 ELECTRICAL ANALOG INSTRUMENTS PANEL BOARD TYPES - UL 1437 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover electrical and ele
42、ctrically operated indicating and recording instruments ofthe analog type that are powered only from the measured parameter and are intended for ordinary use inpanel boards and the like.1.2 These requirements cover direct-acting or indirect-acting instruments and accessories that maycontain electron
43、ic devices.1.3 These requirements cover instruments indicating quantities of electrical analogs including all of thefollowing:a) Ammeters.b) Voltmeters.c) Wattmeters.d) Varmeters (reactive volt-ampere meters).e) Frequency meters.f) Power-factor meters.g) Synchroscopes.1.4 These requirements cover in
44、struments constructed for special purposes such as, ultrasensitive d-cmicroammeters, high-resistance voltmeters, thermo-milliammeters, thermal voltmeters of thevacuum-couple type, and instruments with special and unusual ranges.1.5 These requirements cover analog instruments that may be categorized
45、according to use or principleof operation as follows:a) Use:1) Panel Type, including edgewise.2) Switchboard type, including edgewise.b) Principle of operation:1) Electrodynamics.2) Permanent-magnet moving coil.3) Moving iron.4) Thermocouple.5) Rectifier.DECEMBER 12, 2006ELECTRICAL ANALOG INSTRUMENT
46、S PANEL BOARD TYPES - UL 14376UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL1.6 These requirements also cover auxiliary equipment and accessories designed to be used withmeasuring instruments as indicated in 1.1 1.5.1.7 These requirements do
47、 not cover:a) Indicating instruments provided with arrangements for curve drawing, contact making, andthe like that derive the power for the functioning of these arrangements from an external sourceother than the measured parameter.b) Instruments that use active devices such as transistors, electron
48、 tubes, and the like foramplifying the electrical quantity measured, that require a power source other than the quantitymeasured for operation. An example of this is a battery-powered ohmmeter. This equipment iscovered by the requirements for electrical and electronic measuring and testing equipment
49、, UL1244.1.8 Instruments covered by these requirements are intended for use indoors or in sheltered (from theelements) locations, as follows:a) Temperature540C or 41 104F; instruments may occasionally be used for temporaryor short periods at minus 10 plus 5C or 14 41F.b) Altitude Up to 2200 meters (7218 feet).c) Relative Humidity Up to 80 percent.1.9 These requirements do not cover certain other properties of the instruments such as effectiveness,accuracy, or reli
