UL 346
Standard for Waterflow Indicators for Fire Protective Signaling Systems

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2005-06-30DOD Approved: --
Price Code:AANSI Approved: 2019-09-20
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover vane type waterflow indicators intended for use in fire protective signaling systems to be employed in ordinary indoor locations, in accordance with the National Fire Alarm Code, NFPA 72.

    1.2 Waterflow 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 waterflow indicator is an assembly of a mechanism 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 flow of water in the pipe. This flow is normally caused by the opening of one or more sprinkler heads resulting from a fire condition. The signaling contacts are intended to be connected to circuits of private fire protective signaling systems.

    1.4 These requirements do not cover pressure-operated waterflow indicators.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Units of measurement
            • 2.2 Components
            • 2.3 Undated references
          • 3 Glossary
        • CONSTRUCTION
          • 4 General
            • 4.1 Installation
            • 4.2 Retard feature
            • 4.3 Working pressures
            • 4.4 Mounting positions
          • 5 Enclosure
            • 5.1 General
            • 5.2 Cast metal enclosures
            • 5.3 Sheet metal enclosures
            • 5.4 Nonmetallic enclosures
          • 6 Electric Shock
          • 7 Drain Holes
          • 8 Protection Against Corrosion
          • 9 Field Wiring Connections
            • 9.1 Field wiring terminals and leads
            • 9.2 Field wiring compartment
            • 9.3 Grounded supply terminal and leads
            • 9.4 Strain relief
          • 10 Grounding and Bonding for Grounding
          • 11 Internal Wiring
            • 11.1 General
            • 11.2 Wireways
            • 11.3 Bushings
            • 11.4 Splices
          • 12 Components
            • 12.1 Adjustments and stops
            • 12.2 Barriers
            • 12.3 Coil windings
            • 12.4 Current-carrying parts
            • 12.5 Insulating materials
            • 12.6 Metallic components
            • 12.7 Nonmetallic components
            • 12.8 Mounting of parts
            • 12.9 Tamper protection
            • 12.10 Operating mechanisms
            • 12.11 Printed wiring boards
            • 12.12 Switches
          • 13 Spacings
          • 14 Servicing and Maintenance
        • PERFORMANCE
          • 15 General
            • 15.1 Test units
            • 15.2 Test voltages
            • 15.3 Test samples and data
          • 16 Normal Operation Test
            • 16.1 General
            • 16.2 Coded waterflow indicators
            • 16.3 Noncoded waterflow indicators
          • 17 Calibration Test – Retard Feature
          • 18 Endurance Test – Retard Feature
          • 19 Overload and Endurance Test
          • 20 Temperature Test
          • 21 Electrical Transient Tests
            • 21.1 General
            • 21.2 Supply line transients
            • 21.3 Input/output circuit transients (low-voltage appliances)
          • 22 Dielectric Voltage-Withstand Test
          • 23 Electric Shock Current Test
          • 24 Corrosion Test
          • 25 Abnormal Tests
          • 26 Burnout Test
          • 27 Tests of Polymeric Materials
            • 27.1 Air-oven aging test
            • 27.2 Flame test
            • 27.3 Immersion test
          • 28 Flexing Test (Vane Assembly)
          • 29 Impact Test
          • 30 Tests of Elastomeric Materials
            • 30.1 Oven aging test
            • 30.2 Hardness measurement
            • 30.3 Immersion test (saddle gasket)
          • 31 Immersion Test (Indicator Assembly)
          • 32 Sensitivity Test
          • 33 Hydraulic Friction Loss Test
          • 34 Surge Test
          • 35 Hydrostatic Strength Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 36 Introduction
            • 36.1 General
            • 36.2 Sensitivity and retard calibration test
            • 36.3 Hydrostatic strength test
          • 37 Production-Line Dielectric Voltage-Withstand Test
        • MARKING
          • 38 General
          • 39 Instructions and Installation Drawings