UL 372
Automatic Electrical Controls for Household and Similar Use - Part 2: Particular Requirements for Burner Ignition Systems and Components

Edition Number:6SCC Approved:--
Edition Date:2007-07-31DOD Approved: --
Price Code:DANSI Approved: --


    1 Scope and normative references

    This clause of part 1 is applicable except as follows:

    1.1 Replacement:

    This standard modifies or amends the requirements of the Part 1 standard. In Canada the Part 1 standard applicable is CAN/CSA E60730-1,  Automatic electrical controls for household and similar use – Part 1: General Requirements, and in the U.S. the Part 1 standard applicable is UL 60730-1A , Automatic electrical controls for household and similar use – Part 1: General Requirements, 3rd Edition.

    This standard applies to newly produced automatic burner ignition systems and system components constructed entirely of new, unused parts and materials for the automatic control of burners for one or more of the following fuels:


    natural gas,

    manufactured gas,

    mixed gas,

    liquefied petroleum gas or,

    LP gas-air mixtures

    This standard is applicable to a complete burner ignition system, a separate programming unit, an oxygen depletion safety shutoff system and components that perform one or more of the following functions:

    a)    Ignite the fuel at the main burner(s), or at the pilot burner(s) so it can ignite the main burner(s);

    b)    Prove the presence of either the ignition source, the main burner flame, or both;

    c)    Automatically act to shut off the fuel supply to the main burner(s), or to the pilot and main burner(s), when the supervised flame or ignition source is not proved; and

    d)    Automatically act to shut off the gas supply to the pilot and main burner(s), when the oxygen content of the room in which the equipment is installed is reduced below a predetermined level.

    Components can be, but are not limited to: automatic controls; pilot burners, thermoelectric devices, electrodes, ignition devices, ignition sources and flame detectors.

    Throughout this standard the following terms shall be abbreviated as shown below:

    1.    "system" means "burner ignition system."

    2.    "component" means "burner ignition system component."

    3.    "control" means "system" or "component."

    Requirements for separate ignition transformers are covered in Standard for Specialty Transformers, UL 506, and CSA C22.2 No. 13, the  Standard for Luminous Tube Signs, Oil and Gas Burner Ignition Equipment, Cold-Cathode Interior Lighting.

    1.1.1 Replacement:

    This standard applies to inherent safety; to the manufacturer's declared operating values, operating times and operating sequences where such are associated with burner safety and to the testing of systems and components used in, on, or in association with burners.

    Requirements for specific operating values, operating times, and operating sequences are given in the standards for appliances and equipment.

    1.1.2 Replacement:

    This standard applies to manual controls when such are electrically and/or mechanically integral with automatic systems.

    1.1.3 Not Applicable.

    1.1.4 Not Applicable.

    1.1.5A Addition:

    This standard applies to each component of an automatic burner ignition system shall be capable of operation throughout an ambient temperature range of 32°F (0°C) to 125°F (51.5°C). The manufacturer is allowed to specify temperatures below 32°F (0°C) and above 125°F (51.5°C).

    a)    For gas fired equipment rated 400,000 Btu/hr (117 228 W) or less, Tmin, and Tmax are as specified in 1.1.5A; and

    b)    For burner controls for all other equipment, Tmax, declared at less than 150°F (65.5°C) shall be tested at 150°F (65.5°C) or higher as specified by the manufacturer.

    1.3 Not Applicable.

    1.3A Addition:

    Compliance with this Part 2 standard does not imply that such a control is acceptable for use on fuel burning appliances or equipment without supplemental test with the device(s) applied to the particular appliance or equipment design.

    1.3A.1 All specifications as to construction set forth herein may be satisfied by the construction actually prescribed or such other construction as will provide at least equivalent performance.

    1.3A.2 If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.

    1.4 Replacement:

    This standard applies also to controls incorporating electronic devices, requirements for which are contained in annex h, Requirements for electronic systems and components.

    1.5 Addition:

    1.5.1 Normative references

    The following normative reference documents contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid international Standards.


    ANSI/ASME B1.20.1-1983 (R1992) Pipe Threads, General Purpose (Inch).

    ANSI Z21.21-2005/CSA 6.5-2005 Automatic Valves for Gas Appliances.

    ANSI Z21.78-2005/CSA 6.20-2005  Combination Gas Controls for Gas Appliances.

    ANSI Z223.1/NFPA 54-2006 National Fuel Gas Code.

    CAN/CSA B140.2.1-M90 (R2005) Oil Burners; Atomizing Type.

    CAN/CSA E384-14-1-95 (R2004) Fixed Capacitors in Electronic Equipment – Part 14: Blank Detail Specification: Fixed Capacitors for Electromagnetic Interference Suppression and Connection to the Supply Mains.

    CAN/CSA E60730-02 Automatic Electrical Controls for Household and Similar Use – Part 1: General Requirements,

    CSA B 149.1-05 Natural Gas and Propane Installation Code.

    CSA C22.1-06 Canadian Electrical Code, Part 1.

    CSA C22.2 No. 0.15-01 Adhesive Labels.

    CSA C22.2 No. 0.17-00 (R2004)  Evaluation of Properties of Polymeric Materials.

    CSA C22.2 No. 3-M1988 (R2004) Electrical Features of Fuel Burning Equipment.

    CSA C22.2 No. 13-1962 (R2001) Transformers for Luminous-Tube Signs, Oil- and Gas-Burner Ignition Equipment, Cold-Cathode Interior Lighting.

    CSA C22.2 No. 49-98 (R2003) Flexible Cords and Cables.

    CSA C22.2 No. 65-03 Wire Connectors.

    CSA C22.2 No. 66-1988 (R2001) Specialty Transformers.

    CSA C22.2 No. 94-M91 (R2001) Specialty Purpose Enclosures.

    CSA C22.2 No. 127-99 (R2004) Equipment and Lead Wires.

    CSA C22.2 No. 153-M1981 (R2003)  Quick-Connect Terminals.

    CSA C22.2 No. 158-1987 (R2004) Terminal Blocks.

    CSA C22.2 No. 248.1-00 (R2005) Low-Voltage Fuses – Part 1: General Requirements.

    CAN/CSA-C22.2 No. 60065-03 Audio, video and similar electronic apparatus – Safety Requirements.

    IEC 60068-2-6: 1995-03 Environmental testing – Part 2: Test Fc: Vibration (sinusoidal).

    IEC 60068-2-75: 1997-08 Environmental testing – Part 2–75: Test Eh: Hammer tests.

    IEC 60085: 2004-06 Electrical Insulation – Thermal classification.

    IEC 60127-1: 2003-02 Miniature Fuses – Part 1: Definitions for Miniature Fuses and General Requirements for Miniature Fuse-links.

    IEC 60264-1: 2005-04 Low-voltage Fuses – Part 1: General Requirements.

    CAN/CSA-E60335-1/4-03 Household and similar electrical appliances, Safety – Part 1: General Requirements.

    CAN/CSA-E60384-14-95 (R2004) Fixed capacitors for use in electronic equipment – Part 14: Sectional specification: Fixed capacitors for electromagnetic interference suppression and connection to the supply mains.

    IEC 61000-4-2: 2000-04 Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement techniques – Electrostatic discharge immunity test.

    IEC 61000-4-3: 2002-09 Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test.

    IEC 61000-4-4: 1995-01 Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 4: Electrical fast transient burst immunity test.

    IEC 61558-2-4: 1997-03 Safety of power transformers, power supply units and similar – Part 2: Particular requirements for isolating transformers for general use.

    NFPA 70-2005,  National Electrical Code.

    UL 50-1995 Enclosures for Electrical Equipment.

    UL 248-1-2000 Low-Voltage Fuses.

    UL 486A-1997 Wire Connectors and Soldering Lugs for Use With Copper Conductors.

    UL 506-1994 Specialty Transformers.

    UL 746C-2001 Polymeric Materials – Use in Electrical Equipment Evaluations.

    UL 840-1993 Standard for Safety for Insulation Coordination Including Clearances and Creepage Distances for Electrical Equipment.

    UL 969-1995 Marking and Labeling Systems.

    UL 1059-2001 Standard for Terminal Blocks.

    UL 1414-2000 Across-the-Line, Antenna-Coupling and Line-by-Pass Capacitors for Radio- and Television-Type Appliances.

    UL 1585-1998 Class 2 and Class 3 Transformers.

    UL 1998 Standard for Software in Programmable Components.

    UL 60065-2003 Standard for Audio, video and similar electronic apparatus – Safety requirements.

    UL 60335-1-2004 Household and similar electrical appliances – Safety – Part 1: General requirements.

    UL 60730-1A-2002 Standard for Safety for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements.

    Expand All

    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Body
        • Section
          • 1 Scope and normative references
            • 1.5.1 Normative references
          • 2 Definitions
            • 2.1 Definitions relating to ratings, voltages, currents and wattages
            • 2.2 Definitions of types of control according to purpose
            • 2.3 Definitions relating to the function of controls
            • 2.4 Definitions relating to disconnection and interruption
            • 2.5 Definitions of types of control according to construction
            • 2.7 Definitions relating to protection against electric shock
            • 2.8 Definitions relating to component parts of controls
            • 2.9 Definitions of types of terminals and terminations of controls
            • 2.10 Definitions relating to the connections to controls
            • 2.13 Miscellaneous definitions
            • 2.101 Definitions relating to the type of burner ignition
          • 3 General requirements
          • 4 General notes on tests
            • 4.1 Conditions of test
            • 4.2 Samples required
            • 4.3 Instructions for tests
          • 5 Rating (See 1.2)
          • 6 Classification
            • 6.3 According to their purpose
            • 6.5 According to the control pollution situation
            • 6.6 According to method of connection
            • 6.8 According to protection against the risk of electrical shock
            • 6.10 According to number of cycles of actuation (M) of each manual action
            • 6.11 According to number of automatic cycles (A) of each automatic action
            • 6.14 According to period of electrical stress across insulating parts supporting live parts and between live parts and earthed metal
            • 6.15 According to construction
            • 6.101 According to type of fuel
          • 7 Information
            • 7.2 Methods of providing information
            • 7.3 Class II symbol
            • 7.4 Additional requirements for marking
          • 8 Protection against the risk of electric shock
            • 8.1 General requirements
            • 8.3 Capacitors
          • 9 Provisions for bonding and earthing
            • 9.1 General requirements
            • 9.3 Adequacy of earth connections
          • 10 Terminals and terminations
            • 10.2 Terminals and terminations for internal conductors
          • 11 Constructional requirements
            • 11.1 Materials
            • 11.2 Protection against the risk of electric shock
            • 11.3 Actuation and operation
            • 11.4 Actions
            • 11.5 Openings in Enclosures
            • 11.6 Mounting of controls
            • 11.9 Inlet openings
            • 11.10 Inlets and socket-outlets
            • 11.11 Requirements during mounting, maintenance and servicing
            • 11.101 Flame detector constructional requirements
          • 12 Moisture resistance
            • 12.2 Protection against humid conditions
          • 13 Electric strength and insulation resistance
            • 13.2 Electric strength
          • 14 Heating
            • 14.4 Addition:
          • 15 Manufacturer Deviation and Drift
            • 15.5 Operating times
            • 15.6 Operating sequence
            • 15.7 Flame detector operating characteristics and proved igniters
          • 16 Not Applicable
          • 17 Endurance
            • 17.1.3 Test sequence and conditions
            • 17.2 Electrical conditions for tests
            • 17.3 Thermal conditions for tests
            • 17.16 Tests for particular purpose controls
          • 18 Mechanical strength
            • 18.1 General requirements
            • 18.2 Impact resistance
            • 18.4 Alternate compliance – Impact resistance
            • 18.9 Actuating member and actuating means
            • 18.10A.1 Windows
          • 19 Threaded parts and connections
            • 19.2 Current-carrying connections
          • 20 Creepage distances, clearances and distances through insulation
            • 20.3.23 Separation of circuits
          • 21 Resistance to heat, fire and tracking See .
          • 22 Resistance to corrosion
            • 22.1 Resistance to rusting
          • 23 Radio interference protection
          • 24 Components
          • 25 Normal Operation
          • 26 Electromagnetic compatibility (EMC) requirements – immunity
          • 27 Abnormal operation
            • 27.3 Over-voltage and under-voltage test (See )
          • 28 Guidelines for use of electronic disconnection
          • 29A Construction/performance for pilot burners, oxygen depletion systems (ODS) and other components
            • 29A2.1 Construction Requirements
            • 29A4.1 Construction Requirements
          • 30A Manufacturing and Production Tests
        • Section
        • Annex A Indelibility of Markings
        • Annex C
        • Annex D
        • Annex E
        • Annex F
        • Annex G
        • Annex H (normative) Requirements for electronic systems and components (Also see clauses , Moisture Resistance, and , Endurance.)
          • H2 Definitions
            • H2.4 Definitions relating to disconnection and interruption
            • H2.5 Definitions of type of control according to construction
            • H2.20 Definitions of software terminology – General
          • H4 General notes on test
          • H6 Classification
            • H6.4 According to features of automatic action
            • H6.18 According to software class
          • H7 Information
          • H11 Constructional requirements
            • H11.2 Protection against the risk of electric shock
            • H11.12 Controls using software
          • H13 Not Applicable.
          • H20 Not Applicable.
          • H21 Not Applicable.
          • H25 Not Applicable.
          • H26 Electromagnetic compatibility (EMC) requirements – immunity
            • H26.2 Replacement:
            • H26.5 Test of the influence of voltage dips and short voltage interruptions in the power supply network
            • H26.8.4 Severity levels
            • H26.8.5 Test procedure
            • H26.9 Fast transient burst test
            • H26.10 Ring wave test
            • H26.11 Electrostatic discharge test
            • H26.12 Radiated electromagnetic field test
          • H27 Abnormal Operation
            • H27.1.3.1 Guidelines for the tests of
            • H27.1.3.102 Systems without self checking feature
            • H27.1.3.103 Systems with self-checking features
            • H27.1.3.104 Checking circuits
            • H27.1.4 Electronic circuit fault conditions
          • H28 Not Applicable.
        • Annex J
        • Annex AA (normative) Failure modes of electrical/electronic system components
        • Annex BB
        • Annex CC Additional markings for independently mounted controls
        • Annex DD Coverage for Solid-State Oil Igniters
          • DD.1 Scope
          • DD.2 Definitions
          • DD.3 General Requirements
          • DD.4 Construction
          • DD.5 Tests
        • Annex EE (informative)
        • Appendix A INDEX TO DEFINITIONS (This Appendix is informative and not part of the standard.)