UL 574
Standard for Electric Oil Heaters

DETAILS
Edition Number:8SCC Approved:--
Edition Date:2003-08-14DOD Approved: 1994-04-07
Price Code:AANSI Approved: 2014-08-13
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover electric oil heaters for use with Nos. 5 and 6 fuel oil as defined in Specifications for Fuel Oils, ASTM D396, or other oils such as heat transfer oils. Electric oil heaters are to be used in ordinary locations and installed in accordance with the National Electrical Code, NFPA 70.


    1.1 revised August 14, 2003

    1.2 These requirements do not cover electric oil heaters rated at more than 600 volts.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
    • UL Foreword
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Undated references
        • CONSTRUCTION
          • 3 Assembly
          • 4 Materials
          • 5 Thermal Insulation
          • 6 Supply Connections
          • 7 Internal Wiring
            • 7.1 General
            • 7.2 Bonding for grounding
          • 8 Electrical Insulation
          • 9 Overload Protection
          • 10 Lampholders
          • 11 Switches
          • 12 Controls
          • 13 Mounting of Components
        • SPACINGS
          • 14 General
        • PERFORMANCE
          • 15 Power Input Test
          • 16 Insulation Resistance Test
          • 17 Temperature Tests
            • 17.1 Normal operation test
            • 17.2 Abnormal operation test
          • 18 Volume Change Test
          • 19 10-Day Moist Ammonia-Air Stress Cracking Test
          • 20 Dielectric Voltage Withstand Test
          • 21 Insulation Resistance and Dielectric Voltage Withstand Test
          • 22 Leakage and Hydrostatic Strength Test
        • MANUFACTURING AND PRODUCTION TESTS
          • 23 General
          • 24 Leakage Tests
          • 25 Production Line Dielectric Voltage Withstand Test
        • MARKING
          • 26 General
    • Appendix A