UL 471
Standard for Commercial Refrigerators and Freezers

DETAILS
Edition Number:10SCC Approved:--
Edition Date:2010-11-24DOD Approved: 1976-03-23
Price Code:CANSI Approved: 2016-12-08
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover commercial refrigerators and freezers intended for connection to alternating-current circuits rated not greater than 600 volts.

    1.1.1 These requirements also cover commercial refrigerators and freezers intended for installation within motor fuel dispensing facilities as defined by the Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 30A.

    1.2 These requirements apply to unitary and remote commercial refrigerators and freezers. For the purposes of this standard, commercial refrigerators and freezers include equipment, such as display cases, reach-in cabinets, meat cases, frozen food and merchandising cabinets, beverage coolers, beverage cooler-dispensers, food service carts, ice cream cabinets, soda fountain units, door panel assemblies, laboratory refrigerators and freezers, and processing liquid coolers.

    1.3 Self-contained commercial refrigerators and freezers covered by these requirements employ hermetic or semi-hermetic refrigerant motor-compressors and air- and water-cooled condensers or are of the thermoelectric type.

    1.4 These requirements do not apply to refrigeration systems such as those used in cold-storage rooms, walk-in coolers, and similar places, that are fabricated in the field.

    1.5 Requirements for the installation of commercial refrigerators and freezers are included in the National Electrical Code, ANSI/NFPA 70, and the Safety Standard for Refrigeration Systems, ASHRAE 15.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Terminology
            • 2.4 Undated references
          • 3 Glossary
          • 3A Definitions Relating to Classes of Control Functions
        • CONSTRUCTION
          • 4 General
          • 5 Assembly
            • 5.1 General
            • 5.2 Pressurized product system
            • 5.3 Mechanical protection
            • 5.4 Electrical protection
            • 5.5 Refrigerators and freezers intended for installation within a motor fuel dispensing facility
          • 6 Accessories
          • 7 Enclosures
            • 7.1 General
            • 7.2 Doors and covers
            • 7.3 Enclosures exposed to weather
          • 8 Nonmetallic Materials
            • 8.1 General
            • 8.2 Classification
            • 8.3 Application
        • ELECTRICAL SYSTEM
          • 9 Field Supply Connections
            • 9.1 General
            • 9.2 Permanently connected refrigerators
            • 9.3 Cord-connected refrigerators
            • 9.4 Grounding
          • 10 Internal Wiring And Wiring Methods
            • 10.1 General
            • 10.2 High voltage circuits
            • 10.3 Low voltage circuits
            • 10.4 Wiring method
            • 10.5 Short circuit protection
          • 11 Secondary Circuits
            • 11.1 General
            • 11.2 Class 2 circuits
            • 11.3 Limited voltage/current circuits
          • 12 Separation Of Circuits
          • 13 Bonding For Grounding
        • ELECTRICAL COMPONENTS
          • 14 Current-Carrying Parts
          • 15 Insulating Material
          • 16 Switches And Controllers
            • 16.1 General
            • 16.2 Motor controllers
          • 17 Motors
          • 18 Motor Protection
            • 18.1 General
            • 18.2 Protection of single-phase nonhermetic motors
            • 18.3 Protection of three-phase motors
            • 18.4 Protection of hermetic refrigerant motor-compressors
          • 19 Electric Heaters
            • 19.1 Heater elements
            • 19.2 Heater control
          • 20 Fuseholders And Circuit Breakers
            • 20.1 Fuseholders
            • 20.2 Circuit breakers
          • 20A Fuses and Supplementary Protectors
          • 21 Electric-Discharge Lighting Systems
          • 22 Lighted and Associated Components
          • 23 Incandescent Lighting Systems
          • 24 Guarding Of Lamps
          • 25 Receptacles
          • 26 Receptacle And Lighting Circuits Overcurrent Protection
          • 27 Capacitors
          • 27A Valves and Solenoids
          • 27B Outlet Boxes, Electrical Cable, Conduit and Tubing
          • 27C Electromagnetic Interference Filters
          • 27D Relays and Contactors
          • 27E Wireways, Auxiliary Gutters and Associated Fittings
          • 27F Batteries and Battery Chargers
          • 27G Optical Isolators and Semiconductor Devices
          • 27H Terminal Blocks
          • 27I Printed-Wiring Boards
          • 28 Transformer Protection
            • 28.1 General
            • 28.2 High-voltage transformers – thermal protection
            • 28.3 High-voltage transformers – overcurrent protection
            • 28.4 Overcurrent protective device
          • 29 High-Voltage Control Circuit Conductor Overcurrent Protection
            • 29.1 General
            • 29.2 Direct-connected high-voltage control circuit
            • 29.3 Tapped high-voltage control circuit
        • SPACINGS
          • 30 High-Voltage Circuits
          • 31 Low-Voltage Circuits
          • 32 Alternate Spacings – Clearances and Creepage Distances
        • REFRIGERATION SYSTEM
          • 33 Refrigerants
            • 33.1 General
            • 33.2 Testing
          • 34 Pump-Down Capacity
          • 35 Refrigerant Tubing And Fittings
          • 36 Refrigerant-Containing Parts
          • 37 Pressure-Limiting Device
          • 38 Pressure Relief
            • 38.1 General
            • 38.2 Relief valves
            • 38.3 Fusible plugs or rupture members
          • 38A Thermoelectric System
        • PERFORMANCE
          • 39 Instrumentation
            • 39.1 Temperature measurements
            • 39.2 Pressure measurements
          • 40 Test Voltage
          • 41 Leakage Current Test – Cord Connected Refrigerators
          • 42 Input Test
          • 43 Starting Test
          • 44 Temperature and Pressure Test
          • 45 Heating Test – Condensation Wiring
          • 46 Heating Test – Ballasts And Wiring
          • 47 Defrost Test
          • 48 Dielectric-Voltage Withstand Test
          • 49 Condenser Fan Motor Failure Test
          • 50 Condenser Water Failure Test
          • 51 Evaporator Fan Motor Failure Test
          • 52 Overflow Test
          • 53 Rain Test
          • 54 Stability Test
          • 55 Static Load Test
          • 56 Strain Relief Test
          • 57 Heater Control Tests
            • 57.1 Endurance test
            • 57.2 Calibration test
          • 58 Condensate Water Evaporator Test
          • 59 Abnormal Operation Test – Electric Heater
          • 60 Burnout Tests – Electromagnetic Components
          • 61 Burnout Test – High-Voltage Transformers
          • 62 Overload Test – High-Voltage Transformers
          • 63 Overvoltage And Undervoltage Tests
          • 64 Current Overload Test
          • 65 Insulation Resistance Test
            • 65.1 Heaters
            • 65.2 Thermal and acoustical insulating material
          • 66 Limited Short-Circuit Test
            • 66.1 General
            • 66.2 Motor overload protective device
            • 66.3 Bonding conductors and connections
            • 66.4 Motor circuit conductors and connections
          • 67 Protective Devices – Maximum Continuous Current Test
          • 68 Strength Tests – Pressure Containing Components
            • 68.1 Refrigeration system
            • 68.2 Beverage product system
          • 69 Fatigue Test Analysis
            • 69.1 General
            • 69.2 Initial test
            • 69.3 Material specifications
            • 69.4 Cycling test specifications
            • 69.5 Test method
            • 69.6 Test parameters
            • 69.7 Cycle test pressure specification
          • 70 Start-To-Discharge Test
          • 71 Regulating Relief Valve Endurance Test
          • 72 Shelf Strength Test
          • 73 Component Restraint Test
          • 74 Glass Strength Test
          • 75 Door Latch Release and Door Opening Test
            • 75.1 Door Latch Release Test
            • 75.2 Door Opening Test
          • 76 Accelerated Aging Test – Electric Heaters
          • 77 Reliability Test – Heater Terminations
          • 78 Accelerated Aging Tests
          • 79 Metallic Coating Thickness Test
          • 80 Fastener Strength Test
          • 81 Burnout Test – Impedance Protected Motors
          • 82 Tests on Nonmetallic Materials
          • 83 Label Adhesion Tests
          • 83A Static Pressure Test
          • 83B Reserved
          • 83C Component Failure Test
          • 83D Tests on Thermoelectric Refrigerators and Freezers
            • 83D.1 General
            • 83D.2 Thermoelectric cooling appliances without fans
            • 83D.3 Thermoelectric cooling appliances with fans
            • 83D.4 Thermoelectric circuits powered by other than a low voltage class 2 or limited power source supply
            • 83D.5 Dielectric voltage withstand – 5000 volt test
        • MANUFACTURING AND PRODUCTION TESTS
          • 84 Pressure Tests
          • 85 Production Line Dielectric Voltage Withstand Tests
          • 86 Grounding Continuity Tests
        • MARKING
          • 87 General
            • 87.1 Details
            • 87.2 Refrigerant
            • 87.3 Other markings
            • 87.4 Accessories
          • 88 Permanently Connected Refrigerators
          • 89 Cord Connected Refrigerators
        • INSTRUCTIONS
          • 90 Installation And Operating Instructions
    • UL 60335-1 BASED REQUIREMENTS FOR THE EVALUATION OF ELECTRONIC CIRCUITS
    • APPENDIX A