UL 875
Standard for Electric Dry-Bath Heaters

DETAILS
Edition Number:9SCC Approved:--
Edition Date:2009-05-21DOD Approved: --
Price Code:CANSI Approved: 2016-11-11
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover electric dry-bath heating equipment and other equipment rated 600 volts or less that is intended to produce a dry-heat environment to be installed in accordance with the National Electrical Code, ANSI/NFPA 70. The relative humidity in the heated environment is in the region of 10 – 25 percent and the purpose of the heated environment (for air temperatures, see Sections 25 and 26) is to promote perspiration in a short time by means of a relatively warm and dry atmosphere. The completed equipment is to be provided with an automatic temperature-regulating control that may be integral with the heater or wall-mounted, with an integral manual-reset limit control, a timer, and any other necessary associated equipment. Electric dry-bath heating equipment and other equipment intended to produce a dry-heat environment may consist of:

    a)    A heater unit intended for fixed installation in a special room that is built or assembled in the field to comply to the manufacturer's size specifications;

    b)    A combination of a heater unit and a prefabricated, factory-built room in which the assembled combination may be specified for field installation, or that may be supplied with a power-supply cord and intended to be fastened in place or located in a dedicated space. The room may be arranged so that it can be taken apart for shipment; or

    c)    A combination of a heater and a cabinet that is constructed to enclose all but the user's head. The unit is provided with a power supply cord and is intended to be fastened in place or located in a dedicated space.

    1.2 These requirements do not cover steam-bath heaters, or cable-type radiant-heating equipment, nor any other electric heating equipment or appliances that are covered in separate, individual requirements.

    1.3 Throughout these requirements, the term "heater" is used broadly to refer to any heater unit, including its associated control assembly.

    1.4 A heater shall employ materials and components throughout that are intended for the particular use and shall be made and finished with the degree of uniformity and grade of workmanship practicable in a well-equipped factory.

    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.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Undated references
          • 3 Glossary
        • CONSTRUCTION
          • 3A Component Specifications
          • 3B Component Specifications
            • 3B.1 General
            • 3B.2 Button or coin cell batteries of lithium technologies
          • 3C Safety Critical Functions
          • 4 Frame and Enclosure
          • 5 Risk of Injury to Persons
          • 6 Assembly
          • 7 Corrosion Resistance
          • 8 Supply Connections
            • 8.1 General
            • 8.2 Field-wiring compartment
            • 8.3 Wire-bending space
            • 8.4 Field-wiring terminals and leads
          • 9 Current-Carrying Parts
          • 10 Internal Wiring
            • 10.1 General
            • 10.2 Sleeving and tubing
            • 10.3 Protection of wiring
            • 10.4 Splices and connections
            • 10.5 Separation of circuits
            • 10.6 Barrier material and thickness
            • 10.7 Low-voltage circuits
            • 10.8 Line-voltage circuits
          • 11 Heating Elements
            • 11.1 General
            • 11.2 Sheathed heating element
            • 11.3 Guarding of heating elements
          • 12 Electrical Insulation
          • 13 Thermal Insulation
          • 14 Motors
          • 15 Overcurrent Protection
          • 16 Motor-Running Overcurrent Protection
          • 16A Ground-Fault, Arc-Fault, and Leakage Current Detectors / Interrupters
          • 16B Fuses and Circuit Breakers
          • 17 Short-Circuit Protection
          • 17A Light Sources and Associated Components
          • 18 Lampholders
          • 19 Switches
          • 20 Receptacles
          • 20A Printed Wiring Boards
          • 20B Semiconductors and Small Electronic Components
          • 21 Automatic Temperature Controls
            • 21.1 General
            • 21.2 Terminals and actuating members of temperature controls
          • 21A Liquid Level Controls
          • 21B Pressure Controls
          • 22 Spacings
            • 22.1 General
            • 22.2 Barriers
          • 22A Clearance and Creepage Distances
          • 23 Grounding and Bonding
        • PERFORMANCE
          • 24 Power Input Test
          • 25 Temperature Test
          • 26 Minimum Room Air Temperature Test
          • 27 Insulation Resistance Test
          • 28 Dielectric Voltage-Withstand Test
          • 29 Water Spray Test
          • 30 Abnormal Operation Test
            • 30.1 Temperature
            • 30.2 Mechanical abuse
            • 30.3 Cheesecloth and towel drape
            • 30.4 Thermal cutoff
            • 30.5 Stalled fan
            • 30.6 Component breakdown
          • 31 Motor Switch Overload Test
          • 32 Stability Test
          • 33 Static Loading Test
          • 34 Strength of Legs Test
        • MANUFACTURING AND PRODUCTION-LINE TESTS
          • 35 Dielectric Voltage-Withstand Test
          • 36 Grounding-Continuity Test
        • RATINGS
          • 37 Details
        • MARKINGS
          • 38 Details
          • 39 Permanence of Markings
        • INSTALLATION INSTRUCTIONS
          • 40 Details
        • STATIONARY OR PORTABLE COMBINATION ROOM & HEATER UNITS
          • 41 General
          • 42 Construction
            • 42.1 Room or cabinet
            • 42.2 Ventilation openings
            • 42.3 Heater
            • 42.4 Timed switch
            • 42.5 Power supply connections
            • 42.6 Grounding and bonding
          • 43 Performance
            • 43.1 General
            • 43.2 Leakage current after humidity
            • 43.3 Plywood delamination
          • 44 Warning Marking
    • UL 60335-1 BASED REQUIREMENTS FOR THE EVALUATION OF ELECTRONIC CIRCUITS
    • APPENDIX A