UL 372
Standard for Primary Safety Controls for Gas- and Oil-Fired Appliances

DETAILS
Edition Number:5SCC Approved:--
Edition Date:1994-02-11DOD Approved: --
Price Code:DANSI Approved: 1994-01-20
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover primary safety controls for gas, gas-oil, and oil-fired appliances. These safety controls are intended to sense the presence or absence of flame and, in the event of ignition failure or unintentional flame extinguishment, cause safety shutdown.

    1.2 These requirements are not intended to include those primary safety controls for gas appliances that are of the type intended primarily for use with gas appliances having inputs of 400,000 Btu per hour (120 kW) or less per individual combustion chamber.

    1.3 Requirements for the installation and use of primary safety controls are included in Standards of the National Fire Protection Association, such as those for the installation of:

    Oil-Burning Equipment, ANSI/NFPA 31-1987,

    National Fuel Gas Code, NFPA 54, ANSI Z223.1-1988,

    Ovens and Furnaces, ANSI/NFPA 86-1990, and

    Furnace Explosions/Implosions in Multiple Burner Boiler-Furnaces, ANSI/NFPA 85C-1991.

    1.4 Requirements for the installation of oil-burning equipment are included in codes such as:

    The BOCA National Mechanical Code,

    The Standard Mechanical Code, and

    The Uniform Mechanical Code.

    1.5 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.


    1.5 revised September 1, 2000

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
          • 3 Glossary
          • 3A Instructions
        • CONSTRUCTION
          • 4 General
          • 4A Safety Related Software
          • 5 Frame and Enclosure
            • 5.1 General
            • 5.2 Covers and doors
            • 5.3 Openings
          • 6 Corrosion Protection
          • 7 Insulating Material
          • 8 Wiring Connections
            • 8.1 General
            • 8.2 Terminals
            • 8.3 Wiring space
          • 9 Current-Carrying Parts
          • 10 Internal Wiring
          • 11 Grounding
          • 12 Accessibility
          • 13 Transformers
          • 14 Capacitors
          • 15 Fuseholders
          • 16 Mercury-Tube Switches
          • 17 Coil Windings
          • 18 Spacings
            • 18.1 General
            • 18.2 High-voltage circuits
            • 18.3 Low-voltage circuits
          • 19 Alternate Spacings – Clearances and Creepage Distances
          • 20 Separation of Circuits
            • 20.1 General
            • 20.2 Barriers
          • 21 Calibration Means
          • 22 Mounting
          • 23 Operating Mechanism
          • 24 Reset Mechanism
        • PERFORMANCE
          • 25 General
          • 26 Input Test
          • 27 Temperature Test
          • 28 Operation Test
          • 29 Overload Test
          • 30 Endurance Test
          • 30A FMEA Procedures
          • 30B Mains Borne Perturbations, Magnetic and Electromagnetic Disturbances
            • 30B.1 General
            • 30B.2 Voltage dips and interruptions
            • 30B.3 Ramp voltage tests
            • 30B.4 Voltage/current surge tests
            • 30B.5 Ring wave test
            • 30B.6 Electrostatic discharge tests
            • 30B.7 Radiated electromagnetic field test
          • 30C Thermal cycling test for electronic devices
          • 31 Dielectric Voltage-Withstand Test
          • 32 Volt-Ampere Capacity Test
          • 33 Burnout Test
          • 34 Short-Circuit Test
          • 35 Tests on Leads and Push-In Terminals
            • 35.1 Leads
            • 35.2 Push-in terminals
          • 36 Tests on Conduit Hubs and Nipples
          • 37 Tests on Covers
          • 38 Marking Plate Adhesion Tests
            • 38.1 General
            • 38.2 Oven-aging test
            • 38.3 Humidity test
            • 38.4 Immersion test
            • 38.5 Standard-atmosphere test
            • 38.6 Unusual-condition exposure test
        • MANUFACTURING AND PRODUCTION TESTS
          • 39 General
        • RATING
          • 40 Details
        • MARKING
          • 41 General Marking
          • 42 Cautionary Marking
          • 43 Visibility and Permanence
            • 43.1 General
        • INSTRUCTIONS
          • 44 Operating and Installation Instructions
    • SOFTWARE IN PROGRAMMABLE COMPONENTS
    • APPENDIX A
    • APPENDIX B