UL 521-1999 UL Standard for Safety Heat Detectors for Fire Protective Signaling Systems (Seventh Edition Reprint with revisions through and including December 8 2017)《消防信号系统用热探测器》.pdf
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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
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