UL 710B
Standard for Recirculating Systems

DETAILS
Edition Number:2SCC Approved:--
Edition Date:2011-09-02DOD Approved: --
Price Code:CANSI Approved: 2019-02-01
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover the following recirculating systems rated 600 volts or less and intended for indoor use:

    a)    Non-integral recirculating systems for installation in commercial establishments for the preparation of food;

    b)    Electric commercial cooking appliances provided with integral recirculating systems intended for installation in commercial establishments for the preparation of food; and

    c)    Vending machines provided with integral recirculating systems.

    1.2 These devices incorporate an air filtering system enclosed in a hooded or otherwise contained area intended to capture air from the cooking process area. The hood assembly typically includes a fan, collection hood, or equivalent design and an air filtering system (consisting of a grease filter with or without other filtering means). In addition, except as noted in the Exceptions to 37.1 and 38.1, the hood assembly includes a fire actuated damper, and a fire extinguishing system.

    1.3 Recirculating systems covered by these requirements are intended for installation in accordance with:

    a)    The Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96;

    b)    The National Electrical Code, ANSI/NFPA 70; and

    c)    Other codes such as the International Mechanical Code (IMC), and the Uniform Mechanical Code (UMC).

    1.4 Integral recirculating systems shall comply with the requirements for the cooking appliance as noted below, except as modified or superseded by the requirements in this Standard.

    a)    Commercial electric cooking appliances shall comply with the requirements in the Standard for Commercial Electric Cooking Appliances, UL 197.

    b)    Vending machines shall comply with the requirements in the Standard for Vending Machines, UL 751.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Glossary
        • CONSTRUCTION
          • 6 Accessories
          • 7 Mechanical Assembly
            • 7.1 General
            • 7.2 Mounting of components
            • 7.3 Shipping
          • 8 Electrical and Fire Enclosures
            • 8.1 General
            • 8.2 Metallic enclosures
            • 8.3 Nonmetallic enclosures
            • 8.4 Fire containment – General – Other than hood exhaust system
            • 8.5 Fire containment – Enclosures for overcurrent protective device
          • 9 Accessibility of Live Parts
            • 9.1 General
            • 9.2 Fuses, circuit breakers, supplementary protectors, and manually reset controls
          • 10 Protection of Service Personnel
          • 11 Interlocks
            • 11.1 General
            • 11.2 Moving parts
          • 12 Protection Against Corrosion
          • 13 Electrical Supply Connections
            • 13.1 General
            • 13.2 Wiring compartment
            • 13.3 Field-wiring terminals and leads
            • 13.4 Grounded supply conductor
            • 13.5 Equipment grounding connection
          • 14 Bonding for Grounding
          • 15 Polarity
          • 16 Current-Carrying Parts
          • 17 Attachment-Plug Receptacles
          • 18 Internal Wiring
            • 18.1 General
            • 18.2 Insulation
            • 18.3 Protection
            • 18.4 Wiring in circuits involving a risk of fire or electric shock
            • 18.5 Splices and connections
            • 18.6 Strain relief
            • 18.7 Bushings
          • 19 Casters
          • 20 Electrical Insulation
          • 21 Thermal Insulation
          • 22 Components Located in Grease Airstream
          • 23 Motors and Transformers
            • 23.1 Motors in circuits involving a risk of fire or electric shock
            • 23.2 Motor protection
            • 23.3 Transformers
          • 24 Short-Circuit and Ground-Fault Protection
            • 24.1 General
            • 24.2 Supplementary-type overcurrent protective devices used as short-circuit and ground-fault protection
            • 24.3 Protection for circuits including specific components
            • 24.4 Protection for wiring located outside the enclosure
            • 24.5 Protection for high-voltage control circuits conductors
          • 25 Auxiliary-Circuit Terminals
          • 26 Capacitors
          • 27 Switching Devices
            • 27.1 General
            • 27.2 Electrical ratings
            • 27.3 Guarding
            • 27.4 Specific applications
          • 28 Lampholders
          • 29 Secondary Circuits
            • 29.1 General
            • 29.2 Evaluation of the different types of secondary circuits
            • 29.3 Class 2 circuits
            • 29.4 Limited voltage/current circuits
            • 29.5 Limited voltage circuit requirements
            • 29.6 Limited energy circuits
            • 29.7 Limiting impedance circuits
            • 29.8 Safety extra-low voltage circuits
          • 30 Lithium Battery Circuits
          • 31 Isolating Devices
          • 32 Electrical Spacings
            • 32.1 General
            • 32.2 Secondary circuits
          • 33 Insulating Barriers
          • 34 Clearance and Creepage Distances
          • 35 Separation of Circuits
          • 36 Gas-Tube Signs
          • 37 Fire Extinguishing System Unit
          • 38 Fire Actuated Damper Assemblies
          • 39 Hood Assembly
          • 40 Hood Materials
          • 41 Hood Airflow
          • 42 Filters
            • 42.1 Electrostatic precipitator
            • 42.2 Passive air filters
            • 42.3 Odor filters
            • 42.4 Grease filters
            • 42.5 Filter interlocks
        • PERFORMANCE – ELECTRICAL TESTS
          • 43 General
          • 44 Power Input Test
          • 45 Normal Temperature Test
            • 45.1 General
            • 45.2 Surface temperatures
            • 45.3 Test equipment
            • 45.4 Procedure
            • 45.5 Normal test conditions
          • 46 Dielectric Voltage-Withstand Test
            • 46.1 General
            • 46.2 Primary circuits
            • 46.3 Secondary circuits
            • 46.4 Transformers
          • 47 Insulation Resistance Test
          • 48 Grounding and Bonding Test
            • 48.1 Grounding
            • 48.2 Bonding
          • 49 Stability
          • 50 Short-Circuit Tests
          • 51 Breakdown of Components Test
          • 52 Wiring Endurance Test
          • 53 Strain Relief Test
          • 54 Push-Back Relief
          • 55 Strength of Enclosures, Frames, and Guards Test
            • 55.1 General
            • 55.2 Static force test
            • 55.3 Impact test – frames, guards, and metal enclosures
        • PERFORMANCE – RECIRCULATING SYSTEM TESTS
          • 56 General
          • 57 Lower Airflow Limit Determination
          • 58 Capture Test
          • 59 Emission Test
            • 59.1 General
            • 59.2 Test apparatus
            • 59.3 Sampling procedure
            • 59.4 Sample handling
            • 59.5 Analysis
            • 59.6 Results
          • 60 Damper Tests
            • 60.1 General
            • 60.2 Cycling test
            • 60.3 Closure test
            • 60.4 Damper fire actuation test
          • 61 Fire Extinguishment Tests
            • 61.1 General
            • 61.2 Performance parameters
            • 61.3 Automatic operation fire test
            • 61.4 Delayed operation fire test
            • 61.5 Deep fat fryers and tilt skillets
            • 61.6 Griddle
            • 61.7 Range top
            • 61.8 Radiant char-broilers
            • 61.9 Lava, pumice, or synthetic rock – char-broilers
            • 61.10 Upright broiler
            • 61.11 Chain broiler
            • 61.12 Wok-type appliance
          • 62 Cooking Temperature Splash Test
            • 62.1 General
            • 62.2 Deep fat fryer
            • 62.3 Range top
            • 62.4 Wok
          • 63 Manual Operation Test
            • 63.1 Electrical actuation
            • 63.2 Mechanical actuation
          • 64 Ozone Test
          • 65 Physical and Immersion Tests for Gaskets and Seals
            • 65.1 Tensile strength and elongation
            • 65.2 Aging and immersion
            • 65.3 Volume change
        • PERFORMANCE – COMPONENTS
          • 66 General
          • 67 Transformer Burnout Test
          • 68 Endurance Test for Interlock Switches
          • 69 Motor Switch Overload Test
          • 70 Printed-Wiring Board Abnormal Operation Test
          • 71 Secondary Circuits
            • 71.1 General
            • 71.2 Maximum voltage test
            • 71.3 Maximum current test for inherently limited circuits
            • 71.4 Limited power point determination test
            • 71.5 Component failure test
            • 71.6 Maximum power test
            • 71.7 Power dissipation test
          • 72 Parts Subject to Contact with Oil or Other Liquids
          • 73 Permanence of Marking
        • MANUFACTURING AND PRODUCTION TESTS
          • 74 Dielectric Voltage-Withstand
        • RATINGS
          • 75 General
        • MARKINGS
          • 76 General
          • 77 Visible to Operator
          • 78 Visible After Installation
          • 79 Visible During Installation and Examination
          • 80 Visible During Servicing Operations
          • 81 Nonpermanent Marking
        • INSTRUCTIONS
          • 82 Manufacturer's Literature
    • INTEGRAL AND NON-INTEGRAL RECIRCULATING, DOWNDRAFT SYSTEMS
    • Appendix A