1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 521 Heat Detectors for Fire Protective Signaling Systems STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR
2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Heat Detectors for Fire Protective Signaling Systems, UL 521 Seventh Edition, Dated February 19, 1999 Summary of Topics This revisions of ANSI/UL 521 is being issued to incor
3、porate the following changes: 1. Alternative Paintbrush Marking for Do Not Paint Requirement 2. Updates to Referenced ASTM Standards Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revised requirements are sub
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8、ing from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. OCTOBER 12, 2016 UL 521 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 12, 2016 UL 521 tr2 No Text on
9、 This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 19, 1999 (Title Page Reprinted: October 12, 2016) 1 UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems The rst, second, and third editions were titled F
10、ire Detection Thermostats. First Edition December, 1961 Second Edition June, 1970 Third Edition April, 1974 Fourth Edition September, 1978 Fifth Edition June, 1988 Sixth Edition December, 1993 Seventh Edition February 19, 1999 This ANSI/UL Standard for Safety consists of the Seventh Edition includin
11、g revisions through October 12, 2016. The most recent designation of ANSI/UL 521 as an American National Standard (ANSI) occurred on October 12, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of th
12、e Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in an
13、y way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 521-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P
14、ERMISSION FROM UL OCTOBER 12, 2016 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 2.1 Components .5 2.2 Units o
15、f measurement .6 2.3 Undated references .6 3 Glossary .6 4 Installation and Operating Instructions .7 5 Compatibility Information .7 5.1 General .7 5.2 Method of evaluation 7 5.3 Changes affecting compatibility .8 6 Temperature Designation 8 CONSTRUCTION GENERAL 7 Mounting .8 8 Servicing and Mainten
16、ance Protection .9 9 Materials .9 FIELD-WIRING CONNECTIONS 10 Leads .10 11 Terminals 10 COMPONENTS ELECTRICAL 12 General 10 12.1 Insulating material 10 12.2 Current-carrying parts .10 13 Contacts .11 SPACINGS ELECTRICAL 14 General 11 PERFORMANCE GENERAL 15 Test Units and Data .13 15.1 General .13 15
17、.2 Component reliability data .13 15.3 Miscellaneous data .13 16 Test Voltages 14 17 Test Samples 14 18 Sensitivity-Spacing Allocation 15 OCTOBER 12, 2016 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 2AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION W
18、ITHOUT PERMISSION FROM UL TESTS 19 Oven Test .16 20 Fire Test .19 21 High-Temperature Exposure Test .22 22 Operating Temperature Test .22 23 Rate-of-Rise Operation Test .23 24 Low-Temperature Exposure Test .23 25 Corrosion Tests 24 25.1 General .24 25.2 Indoor-use heat detectors .24 25.3 Outdoor-use
19、 heat detectors 24 26 Determination of Stress Cracking Test 25 26.1 General .25 26.2 Ammonia stress cracking test 26 26.3 Salt immersion cycling test 26 27 Bond Secureness Test 26 28 Humidity Test .26A 29 Transient Tests .27 29.1 General .27 29.2 Internally induced transients .27 29.3 Extraneous tra
20、nsients .27 29.4 Supply line (high-voltage) transients 28 29.5 Supply line (low-voltage circuit) transients 28A 30 Vibration Test 30 31 Overload Tests .30 31.1 Electronic heat detector .30 31.2 Separately energized circuits and non-electric type heat detectors .31 32 Endurance Tests .31 32.1 Electro
21、nic heat detector .31 32.2 Separately energized circuits and non-electric type heat detectors .31 33 Rain Test 31 34 Dielectric Voltage-Withstand Test .35 35 Marking Label Adhesion Tests .35 35.1 General .35 35.2 Air oven-aging test .36 35.3 Immersion test .36 35.4 Standard-atmosphere test .36 35.5
22、Unusual-condition exposure test .36 36 Circuit Measurement Test 37 37 Overvoltage and Undervoltage Tests 37 37.1 General .37 37.2 Undervoltage test 37 38 Component Temperature Test 38 39 Electrical Supervision Test .41 40 Stability Test .42 41 Dynamic Load Immunity Test .42A 42 Polarity Reversal Tes
23、t .43 43 Replacement Test, Head and Cover 43 44 Jarring Test 43 45 Static Discharge Test .44 46 Dust Test 45 47 Tests on Polymeric Materials .47 OCTOBER 12, 2016 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 2BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB
24、UTION WITHOUT PERMISSION FROM UL 47.1 General .47 47.2 Temperature test .47 47.3 Flame test .48 47.4 Impact test .48A 48 Strain Relief Test 48A 49 Abnormal Operations Test 48A MANUFACTURING AND PRODUCTION TESTS 50 General 48B 51 Production Line Dielectric Voltage-Withstand Test for High-Voltage Prod
25、ucts 49 52 Sensitivity Calibration Tests 49 52.1 Rate-of-rise heat detectors 49 52.2 Fixed-temperature heat detectors 49 MARKING 53 General 50 54 Installation Instructions Wiring Diagram 51 54.1 General .51 54.2 Four-wire detectors .53 54.3 Two-wire detectors .53 55 Technical Bulletin .54 SUPPLEMENT
26、 SA - INSTRUCTIONS FOR DETERMINING A RELIABILITY PREDICTION OF ELECTRONIC COMPONENTS AND MICROELECTRIC CIRCUITS SA1 Methods of Determining Failure Rate SA1 SUPPLEMENT SB - CRITERIA FOR ACCEPTANCE OF MICROELECTRONIC DEVICES SB1 General SB1 SB2 Part I Quality Assurance Screening Program SB1 SB3 Part I
27、I Determination of Failure Rate Number Supplemented by Burn-In Test .SB2 SB3.1 General SB2 SB3.2 Determination sequence .SB2 SB3.3 Test calculations and procedures .SB5 SB3.4 Test conditions .SB5 SB3.5 Failure rate number calculation .SB6 APPENDIX A Standards for ComponentsA1 OCTOBER 12, 2016 HEAT D
28、ETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. OCTOBER 22, 2004 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 4UL COPYRIGHTED MATER
29、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover heat detectors for re protective signaling systems intended to be installed in ordinary indoor and outdoor locations in accordance with the Standard for Automatic
30、Fire Detectors, NFPA 72E. 1.2 Heat detectors covered by these requirements employ either normally open contacts or normally closed contacts, provide an electronic signal, or consist of a heat-sensitive cable. The requirements do not cover heat detectors for journal-alarm or unit-alarm devices. 1.3 D
31、eleted October 3, 2002 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this stand
32、ard. 2.1.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in
33、 accordance with its rating established for the intended conditions of use. 2.1.4 Specic 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 not exceeding specie
34、d limits, and shall be used only under those specic conditions. OCTOBER 3, 2002 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of measurement 2.2.1 Values stated witho
35、ut parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Undated references 2.3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standa
36、rd. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. Heat detectors may combine two or more of the following characteristics in one device, such as a xed-temperature, a spot-type capable of repeated operation, or a rate-of-rise type also employing a xed-temperature elem
37、ent. 3.2 COMPONENT, LIMITED-LIFE A component that is expected to fail and be periodically replaced and the failure of which is supervised, if failure of the component affects the intended operation, sensitivity, or both. Typical examples of such components include incandescent lamps, electronic tube
38、 heaters, and functional heating elements. 3.3 COMPONENT, RELIABLE An electrical component that is not expected to fail or be periodically replaced and is not supervised. A reliable component shall have a predicted failure rate of 2.5 or fewer failures per million hours as determined for a Ground Fi
39、xed (GF) environment by MIL-HDBK 217B, or equivalent (see Supplement SA). 3.4 ELECTRONIC-TYPE HEAT DETECTOR A device that uses electronic circuitry to respond to an abnormal high temperature or rate of temperature rise. 3.5 FIXED-TEMPERATURE TYPE HEAT DETECTOR A device that will respond when its ope
40、rating element becomes heated to a predetermined level. The temperature of the air surrounding the device at the moment of operation will vary, depending on the rate at which the temperature is rising. 3.6 HEAT DETECTOR A device that detects an abnormal high temperature or rate of temperature rise.
41、3.7 HEAT-SENSITIVE CABLE A line-type device whose sensitive element comprises two current- carrying wires held separated by a heat-sensitive insulation that softens at the rated temperature, thus allowing the wires to make electrical contact. 3.8 LINE-TYPE HEAT DETECTOR A device in which detection i
42、s continuous along a path. 3.9 NONRESTORABLE HEAT DETECTOR A device whose sensing element is intended to be destroyed by the process of detecting a re. 3.10 RATE-COMPENSATION HEAT DETECTOR A device that will respond when the temperature of the surrounding air reaches the predetermined level, regardl
43、ess of the rate of temperature rise. 3.11 RATE-OF-RISE HEAT DETECTOR A device that will respond when the temperature rises at a rate exceeding a predetermined amount. 3.12 RESTORABLE HEAT DETECTOR A device whose sensing element is not destroyed during intended service by the processes of detecting a
44、 re. Restoration may be manual or automatic. OCTOBER 3, 2002 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.13 SELF-RESTORING HEAT DETECTOR A restorable detector whose sensing
45、 element is intended to be returned to normal automatically. 3.14 SPOT-TYPE HEAT DETECTOR A device whose detecting element is concentrated at a particular location. 3.15 TWO-WIRE DETECTOR A detector that signals over and obtains its power from the initiating device circuit of a re alarm system contr
46、ol unit. Additional terminals or leads may be provided for annunciation or control of supplementary functions. OCTOBER 3, 2002 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 6AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OC
47、TOBER 3, 2002 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 6B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Installation and Operating Instructions 4.1 A copy of the installation and operating instruc
48、tions and related schematic wiring diagrams and installation drawings shall be used as a guide in the examination and test of the detector. For this purpose, a printed edition is not required. The information may be included in a manual or technical bulletin. 4.2 The instructions and drawings shall
49、include such directions and information as deemed by the manufacturer to be necessary for installation, testing, maintenance, operation, and use of the detector. 5 Compatibility Information 5.1 General 5.1.1 Compatibility between a two-wire electronic heat detector that receives its power from the initiating device circuit of a re alarm system control unit is dependent upon the interaction between the circuit parameters, such as voltage, current, frequency, and impe
