UL 268-2016 UL Standard for Safety Smoke Detectors for Fire Alarm Systems (Seventh Edition Reprint with revisions through and including July 15 2016).pdf
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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 268 Smoke Detectors for Fire Alarm SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
2、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Smoke Detectors for Fire Alarm Systems, UL 268 Seventh Edition, Dated January 11, 2016 Summary of Topics This is the Seventh Edition of UL 268, the joint UL/ULC Binational Standard for Smoke Detectors for Fir
3、e Alarm Systems. The new requirements are substantially in accordance with Proposal(s) on this subject dated July 11, 2014 and May 8, 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, mechanica
4、l photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, 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 s
5、pecial, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages 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.
6、 In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users 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, clai
7、m, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JANUARY 11, 2016 UL 268 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU
8、T PERMISSION FROM UL JANUARY 11, 2016 UL 268 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Prepared by: ULC Standards CAN/ULC-S529 Fourth Edition Underwriters Laboratories Inc UL 268 Seventh Edition Smoke Detectors
9、for Fire Alarm Systems January 11, 2016 ANSI/UL 268-2016 Approved byUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This Standard is issued jointly by Underwriters Laboratories Inc. (UL) and ULC Standards. Amendment
10、s to this Standard will be made only after processing according to the Standards writing procedures by UL and ULC Standards. UL and ULC Standards are separate and independent entities and each is solely responsible for its operations and business activities. The UL trade names and trademarks depicte
11、d in this document are the sole property of Underwriters Laboratories Inc. The ULC Standards trade names and trademarks depicted in this document are the sole property of ULC Standards. ISSN 0317-526X Copyright 2016 ULC Standards All rights reserved. No part of this publication may be reproduced in
12、any form, in an electronic retrieval system or otherwise, whatsoever without the prior permission of the publisher. In Canada, written comments are to be sent to ULC Standards, 400 171 Nepean Street, Ottawa, Ontario KP2 0B4. Proposals should be submitted on a Standards Revision Request Form availabl
13、e from ULC Standards. Copyright 2016 Underwriters Laboratories Inc. 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 those Standards shall remain
14、 the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Seventh Edition. The most recent designation of ANSI/UL 268 as an American National Standard (ANSI) occurred on January 11, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages,
15、Title Page (front and back), or the Preface. 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 Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards,
16、visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .9 INTRODUCTION 1 Scope 10 2 General .11 2.1 Assembly .11 2.2 Components 12 2.3 Units of measurement 12 2.4 Referen
17、ce publications .12 3 Glossary 14 4 Detector reliability prediction 16 5 Installation and operating instructions 17 6 Automatic drift compensation for smoke sensing .18 CONSTRUCTION ASSEMBLY 7 General .18 7.1 Remote accessories .18 7.2 Smoke sensitivity indicating means 19 7.3 Radioactive materials
18、20 7.4 Insect guards .20 7.5 Supplementary heat sensor .20 7.6 Maintenance (Field Cleaning) .21 8 Compatibility information 21 8.1 General 21 8.2 Method of evaluation 22 8.3 Changes affecting compatibility .22 9 Servicing and maintenance protection 22 10 Enclosure 23 10.1 General .23 10.2 Cast metal
19、 enclosures 24 10.3 Sheet metal enclosures .24 10.4 Nonmetallic enclosures .25 10.5 Ventilating openings 25 10.6 Covers 26 10.7 Glass panels 27 11 Corrosion protection .27 12 Field wiring connections .27 12.1 General .27 12.2 Field wiring compartment 28 12.3 Field wiring terminals (general) .28 12.4
20、 Special eld-wiring terminals (qualied application) .30 12.5 Field wiring leads .31 12.6 Grounding terminals and leads .31 12.7 Grounded supply terminals and leads .32 12.8 Isolated (nongrounded) detectors 32 13 Internal wiring 32 JANUARY 11, 2016 CAN/ULC-S529 UL 268 3UL COPYRIGHTED MATERIAL NOT AUT
21、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13.1 General .32 13.2 Wireways 33 13.3 Splices 33 13.4 Barriers .34 13.5 Strain relief 34 14 Bonding for grounding .34 COMPONENTS 15 General 35 15.1 Mounting of components 35 15.2 Operating components 36 15.3 Current-carryin
22、g parts .36 16 Bushings 36 17 Electrical insulating material 37 18 Lampholders and lamps .37 19 Photocell illuminating lamps and light emitting diodes (LEDs) Quality assurance program . .38 19.1 Light emitting diode (LED) .38 19.2 Smoke detector manufacturer 39 20 Motors .39 21 Protective devices 39
23、 22 Printed wiring boards 40 23 Switches .40 24 Transformers and coils 40 25 Dropping resistors 40 26 Batteries .40 26.1 General .40 26.2 Battery connections 41 27 Spacings 41 PERFORMANCE 28 General 42 28.1 Test units .42 28.2 Accessories .42 28.3 Performance of single sensor components of multi-cri
24、teria detectors 43 28.4 Test voltages 43 28.5 Test samples and data 44 28.6 Component reliability data .45 28.7 Smoke Detector guards .46 28.8 Test conditions .46 28.9 Tests and analysis .47 29 Normal operation test .47 29.1 General .47 29.2 Standardized alarm signal .48 29.3 Sensitivity shift crite
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