UL 541
Standard for Refrigerated Vending Machines

DETAILS
Edition Number:9SCC Approved:--
Edition Date:2016-04-21DOD Approved: --
Price Code:BANSI Approved: 2018-10-02
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover self-contained, refrigerated vending machines intended for connection to alternating-current circuits rated 600 volts or less in accordance with ANSI/NFPA 70. Vending machines covered by these requirements:

    a)    Incorporate refrigeration systems of the air-cooled or water-cooled type employing hermetic refrigerant motor-compressors;

    b)    May be battery operated;

    c)    May employ flammable refrigerant as defined in Requirements for Refrigerated Venders Employing a Flammable Refrigerant in the Refrigerating System, Supplement sa;

    d)    May employ thermoelectric chilling systems.

    1.2 These requirements also cover refrigerated vending machines intended for installation within motor fuel dispensing facilities in accordance with Supplement sb of this Standard: Requirements for Refrigerated Vending Machines Intended for Installation within Motor Fuel Dispensing Facilities, and as defined by NFPA 30A.

    1.3 These requirements do not cover vending machines incorporating universal motors rated at more than 250 volts, nor vending machines which have a principal function other than storage and dispensing of refrigerated products; nor to vending stations, that is, freestanding stationary structures for outdoor use.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Units of measurement
          • 3 Terminology
          • 4 References
          • 5 Glossary
        • CONSTRUCTION
          • 6 General
          • 7 Nonmetallic Parts
          • 8 Nonmetallic Materials
          • 9 Nonmetallic Material Ignition Sources Separation
          • 10 Nonmetallic Material Application and Location
          • 11 Barriers
          • 12 Accessories
          • 13 Enclosures
            • 13.1 General
            • 13.2 Protection against corrosion
            • 13.3 Electrical enclosures
            • 13.4 Protection from risk of injury
          • 14 Supply Connections for Permanently Connected Venders
            • 14.1 General
            • 14.2 Terminals
            • 14.3 Leads
          • 15 Supply Connections for Cord Connected Venders
          • 16 Grounding and Bonding for Grounding
            • 16.1 General
            • 16.2 Cord connected venders
            • 16.3 Permanently connected venders
          • 17 Internal Wiring and Wiring Methods
            • 17.1 General
            • 17.2 Splices
            • 17.3 Printed wiring boards
          • 18 Separation of Circuits
        • ELECTRICAL COMPONENTS
          • 19 Current-Carrying Parts
          • 20 Insulating Material
          • 21 Capacitors
          • 22 Control Circuit Conductor Overcurrent Protection
            • 22.1 Glossary
            • 22.2 Tapped high-voltage control circuits
          • 23 Short-Circuit Protection
          • 24 Dispenser Mechanism
          • 25 Coin or Credit Mechanism
          • 26 Lighting Systems
            • 26.1 General
            • 26.2 Electric-discharge lighting systems
          • 27 Fuseholders
          • 28 Motors
          • 29 Motor Overload Protection
            • 29.1 General
            • 29.2 Protection of single-phase nonhermetic motors
            • 29.3 Protection of single-phase hermetic refrigerant motor-compressors
            • 29.4 Protection of three-phase motors
            • 29.5 Protective electronic circuits
          • 30 Switches and Controllers
            • 30.1 General
            • 30.2 Relays
            • 30.3 Remotely operated venders
          • 31 Transformer Protection
            • 31.1 High-voltage transformers
            • 31.2 Overcurrent protective devices
          • 32 Valves and Solenoids
          • 33 Batteries and Battery Chargers
          • 34 Circuit Breakers, Fusing Resistors and Supplementary Protectors
          • 35 Connectors
          • 36 Electrical Cable, Conduit and Tubing
          • 37 Electrical Insulation Systems
          • 38 Electromagnetic Interference Filters
          • 39 Fuses
          • 40 Heaters
          • 41 Optical Isolators and Semiconductor Devices
          • 42 Outlet Boxes
          • 43 Power Supplies
          • 44 Receptacles
          • 45 Terminal Blocks
          • 46 Wireways, Auxiliary Gutters and Associated Fittings
          • 47 Solar Photovoltaic Systems
          • 48 Information Technology Equipment
          • 49 Across-The-Line Capacitors, Antenna-Coupling Components, Line-Bypass Components and Fixed Capacitors for Use in Electronic Equipment
        • SPACINGS
          • 50 High-Voltage Circuits
          • 51 Low-Voltage Circuits
          • 52 Alternate Spacings – Clearances and Creepage Distances
        • CARBONATION SYSTEM
          • 53 General
        • PRODUCT LINES
          • 54 General
          • 55 Thermoelectric Refrigerated Venders
        • REFRIGERATION SYSTEM
          • 56 Refrigerant
          • 57 Refrigerant-Containing Parts
            • 57.1 General
            • 57.2 Refrigerant tubing and fittings
          • 58 Pressure Limiting Devices
          • 59 Pressure Relief
            • 59.1 General
            • 59.2 Relief valves
            • 59.3 Fusible plugs or rupture members
        • PERFORMANCE
          • 60 General
            • 60.1 Test voltages
            • 60.2 Temperature measurements
            • 60.3 Pressure measurements
          • 61 Leakage Current Test
          • 62 Input Test
          • 63 Temperature and Pressure Tests
            • 63.1 General
            • 63.2 Automatic venders
          • 64 Dielectric Voltage-Withstand Test
          • 65 Heating Test
          • 66 Insulation Resistance Test
          • 67 Rain Test
          • 68 Stability Test
          • 69 Condenser Fan Motor Failure Test
          • 70 Antitheft Device Test
          • 71 Water Failure Test
          • 72 Start-To-Discharge Test
          • 73 Rupture Member Test
          • 74 Fusible Plug Test
          • 75 Overload and Endurance Test – Switching Devices
          • 76 Burnout Tests – Components
            • 76.1 General
            • 76.2 Electrically operated valves
            • 76.3 Liquid-level system
          • 77 Burnout Test – High-Voltage Transformers
          • 78 Abnormal Tests – Thermoelectric Refrigerated Venders
            • 78.1 General
            • 78.2 Thermoelectric venders without cooling fans
            • 78.3 Thermoelectric venders with cooling fans
            • 78.4 Thermoelectric circuits powered by other than an extra-low-voltage circuit
            • 78.5 Dielectric-Voltage Withstand – 5000 Volt Test
          • 79 Overload Test – High-Voltage Transformers
          • 80 Overvoltage and Undervoltage Tests
          • 81 Limited Short-Circuit Test
            • 81.1 General
            • 81.2 Motor Overload Protective Devices
            • 81.3 Bonding conductors and connections
            • 81.4 Motor circuit conductors and connections
          • 81A Switch Mode Power Supply Units – Overload Test
          • 82 Protective Devices – Maximum Continuous Current Test
          • 83 Strength Tests
          • 84 Glass Strength Test
            • 84.1 Impact test
            • 84.2 Mechanical pressure test
          • 85 Glass Component Strength Test
          • 86 Strain Relief Test
          • 87 Push-Back Strain-Relief Test
          • 88 Wiring Endurance Test
          • 89 Accelerated Aging Tests on Gaskets and Adhesives
          • 90 Metallic Coating Thickness Test
          • 91 Label Adhesion Tests
            • 91.1 General
            • 91.2 Oven-aging test
            • 91.3 Immersion test
            • 91.4 Standard atmosphere test
            • 91.5 Unusual condition exposure test
          • 92 Tests on Nonmetallic Materials
          • 93 Fastener Strength Test
          • 94 Refrigerant Identification Tests
            • 94.1 General
            • 94.2 Infrared analysis
            • 94.3 Gas chromatography analysis
          • 95 Protective Electronic Circuit Tests
            • 95.1 General
            • 95.2 Fault conditions abnormal test
            • 95.3 Electromagnetic compatibility (EMC) tests
            • 95.4 Programmable component reduced supply voltage test
            • 95.5 Fuse-link test
        • MANUFACTURING AND PRODUCTION TESTS
          • 96 Pressure Tests
          • 97 Production Fatigue Test
          • 98 Grounding Continuity Tests
          • 99 Dielectric Voltage-Withstand Tests
          • 100 Annual Refrigerant Identification
          • 100A Protective Electronic Circuit Test
        • MARKING
          • 101 General
          • 102 Protective Electronic Circuit Test
          • 103 Electrical Ratings
          • 104 Coin and Credit Mechanism
          • 105 Accessories
          • 106 Installation Instructions
    • REQUIREMENTS FOR REFRIGERATED VENDING MACHINES INTENDED FOR INSTALLATION WITHIN MOTOR FUEL DISPENSING FACILITIES
    • APPENDIX A Operating and protective ("safety critical") control functions(Normative)