1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 521 Heat Detectors for Fire Protective Signaling SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT
2、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 reaffirm approval as an A
3、merican National Standard. No changes in requirements are involved. 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 revisions are substantially in accordance with Proposal(s) on this subject dated January 30,
4、2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind,
5、either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other dama
6、ges arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Use
7、rs of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an el
8、ectronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for
9、 requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. APRIL 9, 2015 UL 521 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 9,
10、 2015 UL 521 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 19, 1999 (Title Page Reprinted: April 9, 2015) 1 UL 521 Standard for Heat Detectors for Fire Protective Signaling Systems The rst, second, and thir
11、d editions were titled Fire 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
12、Seventh Edition including revisions through April 9, 2015. The most recent designation of ANSI/UL 521 as a Reaffirmed American National Standard (ANS) occurred on April 9, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information
13、 Any other portions of this ANSI/UL standard that were not processed in accordance with ANSI/UL requirements are noted at the beginning of the impacted sections. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a P
14、roposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding thos
15、e Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 521-2010 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 22, 2004 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALI
16、NG 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 of measurement .6 2.3 Undated references .6 3 Glossary .6 4 Installation and O
17、perating 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 Maintenance Protection .9 9 Materials .9 FIELD-WIRING CONNECTIONS 10 Leads .10 11 Te
18、rminals 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 15.2 Component reliability data .13 15.3 Miscellaneous data .13 16 Test Voltage
19、s 14 OCTOBER 22, 2004 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 2AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 17 Test Samples 14 18 Sensitivity-Spacing Allocation 15 TESTS 19 Oven Test .16 20 Fire Test .19 21 High-Tem
20、perature 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 heat detectors 24 26 Determination of Stress Cracking Test 25 26.1 General .
21、25 26.2 Ammonia stress cracking test 25 26.3 Salt immersion cycling test 26 27 Bond Secureness Test 26 28 Humidity Test 26 29 Transient Tests .27 29.1 General .27 29.2 Internally induced transients .27 29.3 Extraneous transients .27 29.4 Supply line (high-voltage) transients 28 29.5 Supply line (low
22、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 Electronic heat detector .31 32.2 Separately energized circuits and non-electric type
23、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 Unusual-condition exposure test .36 36 Circuit Measurement Test 37 37 Overvolta
24、ge 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 Test .43 43 Replacement Test, Head and Cover 43 44 Jarring Test 43 JANUARY 29, 201
25、0 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 2BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 45 Static Discharge Test .44 46 Dust Test 45 47 Tests on Polymeric Materials .47 47.1 General .47 47.2 Temperature test .47 47.
26、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 Products 49 52 Sensitivity Calibration Tests 49 52.1 Rate-of-rise heat detectors 49
27、 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 SA - INSTRUCTIONS FOR DETERMINING A RELIABILITY PREDICTION OF ELECTRONIC COMPO
28、NENTS 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 II Determination of Failure Rate Number Supplemented by Burn-In Test .SB2 SB3.1
29、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 JANUARY 29, 2010 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 3UL COPYRIGHTED MATERIA
30、L 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 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
31、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 Fire Detectors, NFPA 72E. 1.2 Heat detectors covered by these requirements empl
32、oy 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 Deleted October 3, 2002 2 General 2.1 Components 2.1.1 Except as indicated in 2.
33、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 standard. 2.1.2 A component is not required to comply with a specic requirement that
34、 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 accordance with its rating established for the intended conditions of use. 2.1
35、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 specied limits, and shall be used only under those specic conditions. OCTOBER 3, 2002
36、 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 without parentheses are the requirement. Values in parentheses are explanatory or ap
37、proximate 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 standard. 3 Glossary 3.1 For the purpose of this standard the following denitions app
38、ly. 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 element. 3.2 COMPONENT, LIMITED-LIFE A component that is expected to fail and be pe
39、riodically 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 heaters, and functional heating elements. 3.3 COMPONENT, RELIABLE An electrica
40、l 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 Fixed (GF) environment by MIL-HDBK 217B, or equivalent (see Supplement SA). 3.4 E
41、LECTRONIC-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 operating element becomes heated to a predetermined level. The temperature of the
42、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. 3.7 HEAT-SENSITIVE CABLE A line-type device whose sensitive element comprises t
43、wo 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 is continuous along a path. 3.9 NONRESTORABLE HEAT DETECTOR A device whose sensi
44、ng 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, regardless of the rate of temperature rise. 3.11 RATE-OF-RISE HEAT DETECTOR A device t
45、hat 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 re. Restoration may be manual or automatic. OCTOBER 3, 2002 HEAT DETECTORS FOR
46、 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 element is intended to be returned to normal automatically. 3.14 SPOT-TYPE HEA
47、T 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 control unit. Additional terminals or leads may be provided for annunciation or cont
48、rol 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 OCTOBER 3, 2002 HEAT DETECTORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 521 6B
49、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 instructions 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
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