UL 749
Household Dishwashers

DETAILS
Edition Number:11SCC Approved:--
Edition Date:2018-11-30DOD Approved: 1994-08-02
Price Code:CANSI Approved: 2018-11-30
Type:ulcsa

  • SCOPE

    1 Scope

    1.1 This standard applies to electric household dishwashers intended to be used in nonhazardous locations in accordance with the Canadian Electrical Code (CEC), Part I, C22.1, General Requirements – Canadian Electrical Code (CEC), Part II, C22.2, and the National Electrical Code (NEC), NFPA 70, on circuits having a nominal voltage not exceeding 250 V.

    1.2 This standard applies to both cord-connected appliances and permanently-connected appliances.

    1.3 This Standard applies to smart-enabled household dishwashers that are intended to receive and respond to communication signals or data relating to power billing rate or demand response, or communication signals from a remote user interface such as a smart phone or computer. See Supplement sb.

    1.4 This standard applies to household dishwashers generating ozone during normal operation. See Supplement sc.

    1.5 This standard does not apply to commercial appliances. Commercial appliances are covered under the scope of the Standard for Commercial Dishwashing Machines, CSA C22.2 No. 168, or the Standard for Commercial Dishwashers, UL 921.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Household dishwashers
        • 1 Scope
        • 2 Reference Publications
        • 3 Definitions
        • 4 General Requirements
        • 5 General Conditions for the Tests
          • 5.1 Voltage and frequency
          • 5.2 Cheesecloth for heating and abnormal tests
          • 5.3 Test temperature
          • 5.4 Thermocouples
          • 5.5 Dishwashing detergent
          • 5.6 Rinse agent
          • 5.7 Place setting
          • 5.8 High-sudsing detergent
          • 5.9 Water temperature
        • 6 Classification
        • 7 Marking
          • 7.1 General
          • 7.2 Appliance markings
        • 8 Instructions
          • 8.1 General
          • 8.2 Instructions pertaining to a risk of fire, electric shock, or injury to persons
          • 8.3 Installation instructions
          • 8.4 Operating instructions
          • 8.5 User-maintenance instructions
        • 9 Protection Against Accessibility to Current-Carrying Parts
          • 9.1 General
          • 9.2 Enclosures for other than built-in appliances
          • 9.3 Enclosures for built-in appliances
          • 9.4 All dishwashers
        • 10 Starting of Motor-Operated Appliances
        • 11 Power Input and Current
        • 12 Heating
        • 13 Leakage Current
        • 14 Insulation Resistance
        • 15 Moisture Resistance
          • 15.1 General
          • 15.2 Humidity conditioning
          • 15.3 Liquid overflowing from an auxiliary reservoir
          • 15.4 Oversudsing
          • 15.5 Liquid spillage – all appliances
          • 15.6 Liquid spillage – portable appliances
          • 15.7 Wetting of electrical components
          • 15.8 Rain test
          • 15.9 Hose rupture test
          • 15.10 Liquid leaking from an auxiliary reservoir
          • 15.11 Washing test
        • 16 Electric Strength
        • 17 Abnormal Operation
          • 17.1 Burnout test on components
          • 17.2 Stopped timer
          • 17.3 Cord reels
          • 17.4 Nichrome wire test
          • 17.5 Resistance to overvoltage
          • 17.6 Lampholder endurance
        • 18 Stability and Mechanical Hazards
          • 18.1 General
          • 18.2 Stability
          • 18.3 Sharp edges
          • 18.4 Automatic restarting of the motor
          • 18.5 Moving parts
          • 18.6 Guards, interlocks, and the like
          • 18.7 Unintentional operation
        • 19 Mechanical Strength
          • 19.1 General
          • 19.2 Frame and enclosure
        • 20 Construction
          • 20.1 Current-carrying parts
          • 20.2 Bottom openings
          • 20.3 Electrical insulation
          • 20.4 Sound and thermal insulation
          • 20.5 Plumbing requirements
        • 21 Internal Wiring
          • 21.1 General
          • 21.2 Splices and connections
          • 21.3 Separation of circuits
          • 21.4 Barriers
          • 21.5 Endurance test
        • 22 Components
          • 22.1 General
          • 22.2 Mechanical assembly
          • 22.3 Capacitors
          • 22.4 Field-attached or optional accessories
          • 22.5 Heating elements
          • 22.6 Lampholders
          • 22.7 Motors
          • 22.8 Receptacles
          • 22.9 Seals and diaphragms
          • 22.10 Switches
          • 22.11 Controls
          • 22.12 Connecting hoses
          • 22.13 Transformers and power supplies
          • 22.14 Overcurrent protection
          • 22.15 Electrically operated valves
          • 22.16 Terminals and connectors
          • 22.17 Pumps
          • 22.18 Insulating devices
          • 22.19 Adhesives used to secure parts
          • 22.20 Equipment protective devices
        • 23 Supply Connection and External Flexible Cords
          • 23.1 Permanently connected appliances
          • 23.2 Cord-connected appliances
          • 23.3 Push-back relief
          • 23.4 Strain relief
          • 23.5 Cord reels
          • 23.6 Power-supply cord kits for use with undercounter or built-in dishwashers
          • 23.7 Bushings
        • 24 Terminals for External Conductors
        • 25 Provision for Grounding
          • 25.1 General
          • 25.2 Bonding means
          • 25.3 Continuity of grounding circuit
          • 25.4 Grounding terminals and leads
          • 25.5 Heater sheaths
        • 26 Screws and Connections
        • 27 Creepage Distances, Clearances, and Distances through Insulation
        • 28 Alternative Spacings-Clearances and Creepage Distances
        • 29 Resistance to Corrosion
          • 29.1 General
          • 29.2 Liquid containers
          • 29.3 Outdoor use dishwashers (protected locations and outdoor locations)
          • 29.4 Metallic coating thickness test
        • 30 Resistance to Heat, Fire, and Cracking – Polymeric Materials
          • 30.1 General
          • 30.2 Horizontal burning rate
          • 30.3 Flammability
          • 30.4 Enclosure flammability – large mass consideration
          • 30.5 Impact test
          • 30.6 Cold impact
          • 30.7 Mould stress relief
          • 30.8 Immersion
          • 30.9 Thermal ageing
          • 30.10 Long-term exposure
          • 30.11 Endurance
          • 30.12 Tensile strength
          • 30.13 Tensile impact energy
          • 30.14 Seal and gasket tests for outdoor use appliances
          • 30.15 Ultraviolet light exposure
          • 30.16 Water exposure and immersion
        • 31 Manufacturing and Production Tests
          • 31.1 Grounding continuity test
          • 31.2 Electric strength test
        • TABLES
        • FIGURES
    • ALTERNATIVE ELECTRONIC CIRCUIT REQUIREMENTS
    • Annex A (informative) Translations