1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 346 Waterow Indicators for Fire Protective Signaling SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL
2、NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Waterow Indicators for Fire Protective Signaling Systems, UL 346 Fifth Edition, Dated June 30, 2005 Summary of Topics This revision to ANSI/UL 346 is being issued to reect the recent reaffir
3、mation of UL 346 as an American National Standard. No changes have been made to the requirements within this standard. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vert
4、ical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any me
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7、ossibility 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. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expens
8、e, liability, damage, claim, 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. The requirements in this Standard are now in effect, except for those paragraphs, secti
9、ons, 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 requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED
10、REQUIREMENTS notice. OCTOBER 30, 2014 UL 346 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 30, 2014 UL 346 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO
11、N FROM UL JUNE 30, 2005 (Title Page Reprinted: October 30, 2014) 1 UL 346 Standard for Waterow Indicators for Fire Protective Signaling Systems First Edition July, 1975 Second Edition September, 1979 Third Edition September, 1988 Fourth Edition May, 1994 Fifth Edition June 30, 2005 This ANSI/UL Stan
12、dard for Safety consists of the Fifth Edition including revisions through October 30, 2014. The most recent designation of ANSI/UL 346 as a Reaffirmed American National Standard (ANS) occurred on October 30, 2014. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title
13、 Page, or effective date information. 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:/. ULs Standards for Safety are copy
14、righted 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 the sole and exclusive property of UL. COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 346-200
15、5 (R2014)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 30, 2005 WATERFLOW INDICATORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 346 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
16、WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 General 6 2.1 Units of measurement .6 2.2 Components .6 2.3 Undated references .7 3 Glossary .7 CONSTRUCTION 4 General 8 4.1 Installation .8 4.2 Retard feature .8 4.3 Working pressures 8 4.4 Mounting positions 8 5 Enclosure 8 5.1 General
17、.8 5.2 Cast metal enclosures 9 5.3 Sheet metal enclosures 10 5.4 Nonmetallic enclosures .11 6 Electric Shock .11 7 Drain Holes .12 8 Protection Against Corrosion 12 9 Field Wiring Connections .12 9.1 Field wiring terminals and leads .12 9.2 Field wiring compartment .13 9.3 Grounded supply terminal a
18、nd leads .14 9.4 Strain relief .14 10 Grounding and Bonding for Grounding 14 11 Internal Wiring 15 11.1 General .15 11.2 Wireways 16 11.3 Bushings 16 11.4 Splices 16 12 Components .17 12.1 Adjustments and stops 17 12.2 Barriers .17 12.3 Coil windings 17 12.4 Current-carrying parts .18 12.5 Insulatin
19、g materials .18 12.6 Metallic components 19 12.7 Nonmetallic components 19 12.8 Mounting of parts 19 12.9 Tamper protection 20 12.10 Operating mechanisms 20 12.11 Printed wiring boards 21 12.12 Switches .21 13 Spacings 21 14 Servicing and Maintenance 22 JUNE 30, 2005 WATERFLOW INDICATORS FOR FIRE PR
20、OTECTIVE SIGNALING SYSTEMS - UL 346 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 15 General 23 15.1 Test units .23 15.2 Test voltages 23 15.3 Test samples and data 23 16 Normal Operation Test 25 16.1 General .25 16.2 Coded wa
21、terow indicators 25 16.3 Noncoded waterow indicators .26 17 Calibration Test Retard Feature .27 18 Endurance Test Retard Feature 27 19 Overload and Endurance Test 27 20 Temperature Test .29 21 Electrical Transient Tests 31 21.1 General .31 21.2 Supply line transients .31 21.3 Input/output circuit tr
22、ansients (low-voltage appliances) 32 22 Dielectric Voltage-Withstand Test .32 23 Electric Shock Current Test 33 24 Corrosion Test .37 25 Abnormal Tests .37 26 Burnout Test .37 27 Tests of Polymeric Materials .38 27.1 Air-oven aging test .38 27.2 Flame test .39 27.3 Immersion test .40 28 Flexing Test
23、 (Vane Assembly) 40 29 Impact Test 40 30 Tests of Elastomeric Materials 41 30.1 Oven aging test 41 30.2 Hardness measurement .41 30.3 Immersion test (saddle gasket) .41 31 Immersion Test (Indicator Assembly) 41 32 Sensitivity Test .42 33 Hydraulic Friction Loss Test 44 34 Surge Test .44 35 Hydrostat
24、ic Strength Test 45 MANUFACTURING AND PRODUCTION TESTS 36 Introduction 45 36.1 General .45 36.2 Sensitivity and retard calibration test 45 36.3 Hydrostatic strength test 45 37 Production-Line Dielectric Voltage-Withstand Test 46 MARKING 38 General 47 39 Instructions and Installation Drawings .48 JUN
25、E 30, 2005 WATERFLOW INDICATORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 346 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 30, 2005 WATERFLOW INDICATORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 346 5 No Text on This PageUL COPYRI
26、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover vane type waterow indicators intended for use in re protective signaling systems to be employed in ordinary indoor locations, in accordance with the Nat
27、ional Fire Alarm Code, NFPA 72. 1.2 Waterow indicators covered by these requirements include sizes 3/4 inch and larger. The indicator sizes refer to the nominal inside diameter of the main sprinkler pipe or tubing on which they are installed. 1.3 A vane type waterow indicator is an assembly of a mec
28、hanism having electrical contacts arranged to transmit a coded or noncoded signal when the vane, located in the supply pipe (riser) of a sprinkler system, is moved by the ow of water in the pipe. This ow is normally caused by the opening of one or more sprinkler heads resulting from a re condition.
29、The signaling contacts are intended to be connected to circuits of private re protective signaling systems. 1.4 These requirements do not cover pressure-operated waterow indicators. 2 General 2.1 Units of measurement 2.1.1 Values stated without parentheses are the requirement. Values in parentheses
30、are explanatory or approximate information. 2.2 Components 2.2.1 Except as indicated in 2.2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or
31、 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. 2.2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.2.4 Specic components are i
32、ncomplete 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. JUNE 30, 2005 WATERFLOW INDICATORS FOR FI
33、RE PROTECTIVE SIGNALING SYSTEMS - UL 346 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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 referri
34、ng to the latest edition of that code or standard. 3 Glossary 3.1 For the purpose of this standard, the following denitions apply. 3.2 The following abbreviations are used throughout this standard: ASTM American Society for Testing and Materials AWG American Wire Gauge NFPA National Fire Protection
35、Association psig pounds per square inch gauge 3.3 ELECTRICAL CIRCUITS: a) LOW-VOLTAGE CIRCUIT A circuit classied as low-voltage is one involving a potential of not more than 30 volts alternating current (42.4 volts ac peak or direct current), and supplied from a circuit whose power is limited to a m
36、aximum of 100 volt-amperes (VA). b) HIGH-VOLTAGE CIRCUIT A circuit classied as high-voltage is one having circuit characteristics in excess of those of a low-voltage circuit. 3.4 RETARD TIME The elapsed time in seconds between the initial movement of the vane resulting from the ow of a discrete amou
37、nt of water and the actual transmission of an alarm signal. 3.5 SENSITIVITY The minimum rate-of-ow from a system outlet, expressed in gallons per minute (gpm), which will cause the device to send an alarm signal. 3.6 SLIGHT WEEPING Leakage not exceeding 1 uid ounce (29.6 cm 3 ) per hour per linear i
38、nch of pipe diameter. JUNE 30, 2005 WATERFLOW INDICATORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 346 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 4 General 4.1 Installation 4.1.1 A vane type waterow indicator shall be so
39、constructed that it will be suitable for connection to control units, electrically actuated transmitters, or similar units which will permit its application in conformity with applicable standards of the National Fire Protection Association (NFPA). 4.1.2 Waterow indicators are required to be easily
40、installed using tools ordinarily used by pipe tters in the installation of sprinkler system devices. 4.2 Retard feature 4.2.1 If a retard feature is provided on a waterow indicator, it shall be readily adjustable in accordance with the manufacturers instructions and shall be marked with an appropria
41、te scale or equivalent and an indication of the direction of time delay on the device or adjacent to it. If the retard can be adjusted for a greater than 90 second delay, a mechanical stop shall be provided to limit the delay to 90 seconds. 4.3 Working pressures 4.3.1 A waterow indicator shall be co
42、nstructed for a maximum working pressure of 175 psig (1.21 MPa) unless specically indicated otherwise on the device. 4.4 Mounting positions 4.4.1 A waterow indicator may be constructed to operate as intended when installed in the horizontal position only, or the vertical position only, or it may be
43、constructed to operate in both of these positions. An indicator intended for mounting only in one position, shall be marked to indicate that position. 5 Enclosure 5.1 General 5.1.1 The enclosure of a waterow indicator shall be formed and assembled so that it has the strength and rigidity necessary t
44、o resist the abuses to which it is likely to be subjected in service without impairing its operation due to total or partial collapse with resulting reduction of spacings, or loosening, or displacement of parts. 5.1.2 All electrical parts of a waterow indicator shall be enclosed to provide protectio
45、n against contact with uninsulated live parts. 5.1.3 The enclosure of a waterow indicator shall be provided with means for mounting in the intended manner. Any ttings, such as brackets, hangers, or the like, necessary for the intended mounting shall be furnished with the unit. The mounting means sha
46、ll be accessible without disassembling any operating part of the indicator. JUNE 30, 2005 WATERFLOW INDICATORS FOR FIRE PROTECTIVE SIGNALING SYSTEMS - UL 346 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.1.4 An enclosure shall have prov
47、ision for the connection of metal-clad cable, conduit, or nonmetallic sheathed cable. Exception: An enclosure without such provision may be acceptable if denite instructions are furnished with it indicating the sections of the waterow indicator which are intended to be drilled in the eld for the con
48、nection of raceways, or if the unit is intended for mounting on an outlet box. 5.2 Cast metal enclosures 5.2.1 The thickness of cast metal for an enclosure shall be as indicated in Table 5.1. Table 5.1 Cast-metal enclosures Use, or dimensions of area involved Minimum thickness, inch (mm) a Die-cast
49、metal Cast metal of other than the die-cast type Area of 24 square inches (155 cm 2 ) or less and having no dimension greater than 6 inches (152 mm) 1/16 (1.6) 1/8 (3.2) Area greater than 24 square inches or having any dimension greater than 6 inches 3/32 (2.4) 1/8 (3.2) At a threaded conduit hole 1/4 (6.4) 1/4 (6.4) At an unthreaded conduit hole 1/8 (3.2) 1/8 (3.2) a Cast metal having a thickness 1/32 inch (0.8 mm) less than that indicated may be employed if the su
