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
25、ria 49 30 Electrical supervision test 49 30.1 General .49 30.2 Component Failure .50 30.3 Photocell illuminating lamps and light emitting diodes (LEDs) 51 30.4 Battery powered units .51 30.5 Smoke Chamber monitoring (Required only when the detector employs a chamber monitoring feature) .52 JANUARY 1
26、1, 2016 CAN/ULC-S529 UL 268 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 30.6 End-of-life signal .52 30.7 Multi-criteria smoke detector with gas sensor 53 31 Sensitivity test 53 31.1 Sensitivity test smoke sensor 53 31.2 Sensitivity test
27、 gas sensor of a multi-criteria detector .56 31.3 Sensitivity test heat sensor 57 31.4 Sensitivity test - sensors other than smoke, gas or heat .57 32 Automatic drift compensation for smoke sensing 57 33 Directionality Test .58 34 Velocity-sensitivity Test 58 34.1 Smoke sensor .58 34.2 Multi-criteri
28、a detector with gas sensor .59 35 Smoke Entry (Stack Effect) Test 59 36 Lamp Interchangeability Test (Photoelectric) .59 37 Reduction in Light Output Test .60 38 Stability Test .60 39 Stability tests multi-criteria detectors incorporating gas sensor(s) .63 40 Test for effect of air velocity 63 41 Fi
29、re tests 64 41.1 General .64 41.2 Paper re .65 41.3 Wood re (United States only) .66 41.4 Flammable liquid re 67 41.5 Igniter assembly 68 41.6 Test method .68 42 Smoldering smoke test 69 43 Smoldering smoke test maximum obscuration without alarm (United States only) .71 44 Selectivity Test Multi-cri
30、teria Detectors Incorporating Gas Sensor(s) 72 45 Circuit Measurement Test 72 45.1 General .72 45.2 Battery trouble voltage determination .73 46 Overvoltage and Undervoltage Tests 74 46.1 Overvoltage test .74 46.2 Undervoltage test 75 46.3 Two-wire smoke detectors .75 47 Temperature Test .75 48 Vibr
31、ation Test 77 49 Replacement Test, Head and Covers .77 50 Jarring test .77 51 Variable Ambient Temperature Tests 78 51.1 Operation in high and low ambients 78 51.2 Effect of shipping and storage Single and Multi-criteria Detectors .79 51.3 Effect of shipping and storage Multicriteria Detectors Incor
32、porating Gas Sensor(s) .80 52 Humidity Test 80 52.1 High humidity 80 52.2 Low humidity (multi-criteria detectors with gas sensors 80 53 Corrosion Tests 80 54 Alternate Corrosion Test for Detectors with a Specied Life Not Exceeding 10 Years (21 day) .81 55 Transient Tests .82 55.1 General .82 55.2 In
33、ternally induced transients .82 55.3 Extraneous transients .82 55.4 Supply line (ring wave surge voltage) transients 83 JANUARY 11, 2016 CAN/ULC-S529 UL 268 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 55.5 Supply line (extra-low-voltage
34、 circuit) transients 84 56 Static Discharge Test .84 57 Dust Test 85 58 Overload Tests .85 58.1 Detector .85 58.2 Separately energized circuits 86 59 Endurance Test 86 60 Audible signaling appliance 86 61 Fire Test Smoke Detector with supplementary heat detection 87 62 Abnormal Operation Test 87 63
35、Locked Rotor Test 87 63.1 Motors 87 63.2 Thermal or overcurrent protection (United States only) 88 63.3 Impedance protection (United States only) 89 64 Dielectric Voltage-Withstand Test .89 65 Polarity Reversal Test .90 66 Tests on Polymeric Materials .90 66.1 General .90 66.2 Temperature test .91 6
36、6.3 Flame test 19 mm (3/4-inch) .92 66.4 Flame test 127 mm (5-inch) 93 67 Strain Relief Test .94 67.1 General .94 67.2 Special eld-wiring terminals .94 68 Non-compulsory Fire and Smoldering Smoke Tests (United States Only) 95 69 Survivability Test .95 70 Audibility test .95 70.1 General .95 70.2 Sou
37、nd output measurement (United States only) .96 70.3 Sound output measurement (Canada only) 96 70.4 Low frequency alarm signal format .97 71 Field Service Tests .97 71.1 Go/no-go eld test (for the smoke sensor) .97 71.2 Go/No-Go eld test (gas sensors used in multi-criteria smoke detectors) 98 71.3 Ma
38、intenance (Cleaning) .98 72 Battery Tests .98 73 Conformal Coatings on Printed Wiring Boards 99 73.1 General .99 73.2 Low voltage printed wiring boards .100 73.3 High voltage printed wiring boards 100 74 Air duct detectors (Canada Only) 101 MANUFACTURING AND PRODUCTION 75 General 101 76 Sensitivity
39、calibration tests 101 77 Smoke tests 102 78 Photocell illuminating lamp test 102 79 Production line dielectric voltage-withstand tests .102 80 Measurement of in-service reliability for multi-criteria detectors with gas sensor(s) .103 80.1 Required in-service reliability .103 80.2 Sample frequency an
40、d sample size 103 80.3 Test results and record keeping .104 JANUARY 11, 2016 CAN/ULC-S529 UL 268 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARKING 81 General 104 82 Packaging marking (United States Only) 107 INSTRUCTIONS 83 Installati
41、on instructions wiring diagram .108 83.1 All detectors 108 83.2 Four-wire detectors 109 83.3 Two-wire detectors 110 83.4 Installation Instructions and User Manual RF Equipment .110 84 Technical bulletin 110 Tables .112 Figures 121 ANNEX A (INFORMATIVE) TYPICAL CANADIAN SENSITIVITY SMOKE TEST CHAMBER
42、 CONSTRUCTION A1 Chamber Congurations 148 A2 Outer Cabinet .148 A3 Inner Compartment 148 A4 Chamber Equipment .148 ANNEX B (INFORMATIVE) TYPICAL UNITED STATES SENSITIVITY SMOKE TEST CHAMBER CONSTRUCTION B1 Construction 150 ANNEX C (NORMATIVE) OBSCURATION CALCULATIONS C1 Equations For Calculation Of
43、Obscuration And Optical Density .155 C2 Meter reading v. obscuration 157 ANNEX D (NORMATIVE) RELIABILITY PREDICTION AND CRITERIA FOR ACCEPTANCE INSTRUCTIONS FOR DETERMINING A RELIABILITY PREDICTION OF ELECTRONIC COMPONENTS AND MICROELECTRIC CIRCUITS D1 Methods Of Determining Failure Rate 160 CRITERI
44、A FOR ACCEPTANCE OF MICROELECTRONIC DEVICES D2 General 168 D3 Part I Quality Assurance Screening Program 168 D4 Part II Determination of Failure Rate Number Supplemented by Burn-In Test 170 D4.1 General 170 D4.2 Determination sequence .170 D4.3 Test calculations and procedures .170 JANUARY 11, 2016
45、CAN/ULC-S529 UL 268 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL D4.4 Test conditions .171 D4.5 Failure rate number calculation .173 ANNEX E (INFORMATIVE) STANDARDS FOR COMPONENTS ANNEX F (INFORMATIVE) TYPICAL AIR DUCT DETECTOR TEST FACI
46、LITY (CANADA ONLY) ANNEX G (NORMATIVE) FRENCH TRANSLATIONS OF REQUIRED MARKINGS ANNEX H (INFORMATIVE) SAMPLE SIZE DETERMINATION FOR IN SERVICE RELIABILITY TESTING OF MULTICRITERIA DETECTORS CONSISTING OF GAS DETECTION H1 General 179 H2 Procedure 187 H3 Statistical Derivation of Table H2 188 JANUARY
47、11, 2016 CAN/ULC-S529 UL 268 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL and ULC Standard for Smoke Detectors for Fire Alarm Systems. It is the fourth edition of CAN/ULC-S529 and seventh edition of ANSI/UL
48、268. This Joint Standard was prepared by Underwriters Laboratories Inc., ULC Standards, and the NEMA Technical Committee on Initiating Devices. The standard was formally approved by the UL Standards Technical Panel on Smoke Detectors and Alarms, and the ULC Technical Committee on Fire Alarm and Life
49、 Safety Equipment and Systems. The efforts and support of the NEMA Technical Harmonization Committee, UL Standards Technical Panel, and ULC Technical Committee are gratefully acknowledged. Only metric SI units of measurement are used in this Standard. If a value for measurement is followed by a value in other units in parentheses, the second value may be approximate. The rst stated value is the requirement. In Canada, there ar
