UL 353
Standard for Limit Controls

DETAILS
Edition Number:5SCC Approved:--
Edition Date:1994-09-23DOD Approved: 1992-01-27
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover limit controls, furnace fan controls, and other interlocks which are essentially switches responding to changes in liquid level, pressure, or temperature. Although not limited to such specific applications, these safety controls include those intended primarily to safeguard heating appliances, heating systems, processing systems, and air-conditioning and ventilating systems.

    1.2 These requirements do not cover thermal protectors for motors and fluorescent-lamp ballasts.

    1.3 These controls are for use in ordinary locations. Requirements for the installation and use of limit controls are included in Standards of the National Fire Protection Association, such as those for Installation of:

    Air-Conditioning and Ventilating Systems, NFPA 90A-1993,

    Warm-Air Heating and Air-Conditioning Systems, NFPA 90B-1993,

    Oil-Burning Equipment, NFPA 31, ANSI Z95.1-1993,

    National Fuel Gas Code, NFPA 54-1990,

    Ovens and Furnaces, NFPA 86-1990, and

    Prevention of Furnace Explosions in Fuel Oil and Natural Gas-Fired Watertube Boiler Furnaces With One Burner, NFPA 85C-1991.

    1.4 These requirements cover equipment rated not more than 600 volts and intended for installation in accordance with the requirements of the National Electrical Code, ANSI/NFPA 70.

    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 April 30, 2001

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Units of measurement
            • 2.2 Components
          • 3 Glossary
        • CONSTRUCTION
          • 3A Components
            • 3A.1 General
            • 3A.2 Attachment plugs, receptacles, connectors, and terminals
            • 3A.3 Batteries and battery chargers
            • 3A.4 Electrical boxes and raceways
            • 3A.5 Capacitors and filters
            • 3A.5A Surge Protective Devices
            • 3A.6 Gaskets and seals
            • 3A.7 Insulation systems
            • 3A.8 Overcurrent protection
            • 3A.9 Marking and labeling systems
            • 3A.10 Power supplies
            • 3A.11 Printed wiring boards
            • 3A.12 Semiconductors
            • 3A.13 Supplemental insulation, insulating bushings, and assembly aids
            • 3A.14 Valves (electrically operated) and solenoids
          • 4 General
          • 4A Safety Related Software
          • 4B Electronic Controls
          • 5 Materials
          • 6 Frame and Enclosure
            • 6.1 General
            • 6.1A Polymeric materials and enclosures
            • 6.2 Accessibility of live parts
            • 6.3 Covers and doors
            • 6.4 Openings
          • 7 Corrosion Protection
          • 8 Insulating Material
          • 9 Field Wiring Connections
            • 9.1 General
            • 9.2 Terminals
            • 9.3 Wiring space
          • 10 Current-Carrying Parts
          • 11 Internal Wiring
          • 12 Grounding
          • 13 Protection of Users and Service Personnel
          • 14 Transformers
          • 15 Fuseholders
          • 16 Switches
          • 17 Coil Windings and Film-Coated Wire (Magnet Wire)
          • 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 Adjustment and Stops
          • 25 Reset Mechanism
        • PERFORMANCE
          • 26 General Tests
          • 27 Input Test
          • 28 Temperature Test
            • 28.1 General
            • 28.2 Temperature test of temperature control for air or other gas
            • 28.3 Temperature test of temperature control for liquids
            • 28.4 Temperature test of steam pressure or boiler water-level limit control
            • 28.5 Temperature test of stack-mounted control
          • 29 Operation Tests
            • 29.1 General
            • 29.2 Test of immersion-type temperature-operated control
            • 29.3 Test of surface-mounted temperature-operated control for hot-water heating systems
            • 29.4 Test of pressure-operated control
            • 29.5 Test of electromagnet
          • 30 Overload Test
          • 31 Endurance Test
          • 31A Failure Mode Effect Analysis (FMEA) Procedures
          • 31B Mains Borne Perturbations, Magnetic and Electromagnetic Disturbances
            • 31B.1 General
            • 31B.2 Voltage dips and interruptions
            • 31B.3 Ramp voltage tests
            • 31B.4 Voltage/current surge tests
            • 31B.5 Ring wave test
            • 31B.6 Electrostatic discharge tests
            • 31B.7 Radiated electromagnet field test
          • 31C Thermal Cycling Test for Electronic Devices
          • 32 Dielectric Voltage-Withstand Test
          • 33 Volt-Ampere Capacity Test
          • 34 Burnout Test
          • 35 Short Circuit Test
          • 36 Leakage Test
          • 37 Strength of Parts Test
          • 38 Parts Containing Liquid Metal
          • 39 10-Day Moist Ammonia Air Stress Cracking Test
          • 40 Push-In Terminals Test
            • 40.1 Pullout test
            • 40.2 Temperature test
          • 41 Volume Change Test
          • 42 Weight Loss Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 43 General
        • RATING
          • 44 Rating
        • MARKING
          • 45 General Marking
          • 46 Cautionary Markings
          • 47 Markings (Visibility and Permanence)
            • 47.1 General
            • 47.2 Oven-aging test
            • 47.3 Immersion test
            • 47.4 Standard-atmosphere test
            • 47.5 Unusual-condition exposure test
        • INSTRUCTIONS
          • 48 Installation Instructions
    • SOFTWARE IN PROGRAMMABLE COMPONENTS
    • Superseded List