UL-1481-1999.pdf

COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services Underwriters laboratories 1nc.s Northbrook, Illinois * (847) 272-8800 Melville, NewYork*(516) 271-6200 Santa Clara, California * (408) 985-2400 Research Triangle Park, North Carolina* (919) 549-1400 Camas, Washington. (360) 817-5500 Underwriters Laboratories Inc., founded in 1894, is chartered as a not-for-profit organization without capital stock, under the laws of the State of Delaware, to establish, maintain, and operate laboratories for the examination and testing of devices, systems and materials to determine their relation to hazards to life and property, and to ascertain, define and publish standards, classifications and specifications for materials, devices, products, equipment, constructions, methods, and systems affecting such hazards. 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Licensed by Information Handling Services STDmUL 14BL-ENGL 1777 D 7275775 078227b T48 D April 9,1999 - UL 1481 trl Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook, IL 60062-2096 UL Standard for Safety Power Supplies for Fire-Protective Signaling Systems, UL 1481 for Fourth Edition, Dated April 9, 1999 A change is indicated by a note following the affected item. The note is preceded and followed by an asterisk. The new and/or revised requirements are substantially in accordance with ULs Bulletin on this subject dated December 30, 1998. The bulletin is now obsolete and may be discarded. The master for this Standard at ULs Northbrook Office is the official document insofar as it relates to a UL service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this Standard. ULs Standards for Safety are copyrighted by UL. 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The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for 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that have been revised and that have a future effective date are located after the Standard, and are preceded by a “SUPERSEDED REQUIREMENTS“ notice. New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unless the applicant specifically requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing, Recognition, and Follow-Up Services after the effective date, and understanding of this should be signified in writing. Copyright 1999 Underwriters Laboratories Inc. COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services STD.UL 14AL-ENGL 1777 W 7275775 0782278 810 APRIL 9, 1999 1 UL 1481 Standard for Power Supplies for Fire-Protective Signaling Systems First Edition - August, 1978 Second Edition - May, 1987 Third Edition - February, 1994 Fourth Edition April 9, 1999 An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc. Revisions of this standard will be made by issuing revised or additional pages bearing their date o f issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all o f which are itemized on the transmittal notice that accompanies the latest set of revised requirements. ISBN 0-7629-0341 -4 COPYRIGHT 1978,1999 UNDERWRITERS LABORATORIES INC. COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services 2 POWER SUPPLIES FOR FIRE-PROTECTIVE SIGNALING SYSTEMS - UL 1481 APRIL 9, 1999 No Text on This Page COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services STD-UL 1LiBL-ENGL 1799 D 7275775 0782300 2T7 = APRIL 9. 1999 POWER SUPPLIES FOR FIRE-PROTECTIVE SIGNALING SYSTEMS . UL 1481 3 CONTENTS FOREWORD INTRODUCTION 1 Scope . 7 2 General 7 3 Glossary 8 INSTRUCTIONS AND DRAWINGS 4 Details . 9 CONSTRUCTION ASSEMBLY 5 General . 10 6 Enclosures . 11 7 Protection of Service Personnel 19 8 Electric Shock . 20 9 Corrosion Protection 21 FIELD-WIRING CONNECTIONS 10 General 21 11 Separation of Circuits 22 12 Field-Wiring Compartment . 22 13 Terminals . General Application 23 14 Leads 23 15 Grounding 23 INTERNAL WIRING AND ASSEMBLY 16 General 25 17 Separation of Circuits 26 18 Bonding for Grounding . 26 COMPONENTS . ELECTRICAL 19 General 28 20 Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 21 Overcurrent Protection . 30 22 Semiconductors 30 23 Storage Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 24 Switches 30 25 Transformers, Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 26 Spacings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services - STD=UL 1481-ENGL 1997 9 9275795 0782301 135 W POWER SUPPLIES FOR FIRE-PROTECTIVE SIGNALING SYSTEMS . UL 1481 APRIL 9. 1999 4 PERFORMANCE DETAILS 27 General 33 33 28 Test Voltages and Currents TESTS . POWER SUPPLIES 29 Input Test . Power Supplies . 33 30 Variable Voltage Operation Test . Power Supplies . 33 31 Power-Limited Circuits 34 32 Output Ripple Test 37 TESTS . POWER SUPPLY-BATTERY CHARGERS 33 General 37 34 Input Test - Power Supplies-Battery Chargers 37 35 Variable Voltage Operation Test - Power Supplies-Battery Chargers 37 36 Charging Current Tests . 38 TESTS . BAlTERY CHARGERS 37 General 39 39 39 38 Input Test - Battery Chargers 39 39 Variable Voltage Operation Test - Battery Chargers 40 Charging Current Test TESTS -ALL UNITS 41 Variable Ambient Temperature Test 39 42 Humidity Test 39 43 Electric Shock Current Test 40 44 Leakage Current Test 44 45 Jarring Test . 47 46 Temperature Test . 48 47 Transient Tests . 51 48 Dielectric Voltage-Withstand Test 54 49 Overload Test 55 50 Endurance Test 56 51 Abnormal Operation Test 56 52 Coil Burnout Tests 57 53 Component Malfunction . 58 54 Strain Relief . 58 55 Impact Test for Enclosures 59 56 Effect of Shipping and Storage Temperatures . 59 MANUFACTURING AND PRODUCTION TESTS 57 Production-Line Dielectric Voltage-Withstand Test . 59 COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services STD-UL 198L-ENGL 1999 7275795 0782302 071 9 APRIL 9, I999 POWER SUPPLIES FOR FIRE-PROTECTIVE SIGNALING SYSTEMS - UL 1481 5 MARKING 58 General 60 59 Permanence of Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 APPENDIX A Standards for Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Al COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services COPYRIGHT Underwriters Laboratories Inc. Licensed by Information Handling Services STD-UL L481-ENGL 1777 7275775 O782303 TO8 M 6 POWER SUPPLIES FOR FIRE-PROTECTIVE SIGNALING SYSTEMS - UL 1481 APRIL 9, 1999 FOREWORD A. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below and in the Scope section of this Standard. These requirements are based upon sound engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufacturers, users, inspection authorities, and others having specialized experience. They are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturers product. C. A product which complies with the text of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have other features which impair the level of safety contemplated by these requirements. D. A product employing materials or having forms of construction which conflict with specific requirements of the Standard cannot be judged to comply with the Standard. A product employing materials or having forms of construction not addressed by this Standard may be examined and tested according to the intent of the requirements and, if found to meet the intent of this Standard, may be judged to comply with the Standard. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment given with due consideration to the necessary limitations of practical operation and state of the art at the time the Standard is processed. UL shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including