UL 1203
Standard for Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2013-11-22DOD Approved: --
Price Code:BANSI Approved: 2015-10-16
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover explosion-proof and dust-ignition-proof electrical equipment for installation and use in hazardous (classified) locations, Class I, Division 1, Groups A, B, C, and D, and Class II, Division 1, Groups E, F, and G, in accordance with the National Electrical Code, NFPA 70.

    1.2 These requirements also cover explosion-proof electrical equipment for installation and use in Class I, Zone 1, Groups IIA, IIB, and IIC hazardous (classified) locations and dust-ignition-proof equipment for use in Zone 20, 21, and 22 locations.

    1.3 These requirements also cover explosion-proof electrical equipment that has been investigated for use in one or more specific gas or vapor atmospheres with or without additional Class I Groups. See 60.6.

    1.4 These requirements do not cover equipment for use in hazardous (classified) locations specifically covered in a separate standard.

    1.5 These requirements do not cover electrostatic devices, circuits or systems; refrigeration system controllers or the internal construction of electrical instruments such as meters.

    1.6 These requirements cover equipment for use under the following atmospheric conditions:

    a)    A minimum ambient temperature of minus 50°C (minus 58°F);

    b)    An oxygen concentration not greater than 21 percent by volume; and

    c)    A nominal barometric pressure of one atmosphere.

    1.7 Equipment covered by this standard shall also comply with the applicable requirements for similar equipment for use in ordinary unclassified locations.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • Part
          • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Undated References
          • 5 Enclosure Types
          • 6 Class I, Zone and Group Equivalency
            • 6.1 Class I, Zone 1, Group IIA
            • 6.2 Class I, Zone 1, Group IIB
            • 6.3 Class I, Zone 1, Group IIC
            • 6.4 Zone 20 and Zone 21
          • 7 Glossary
        • PART I – EXPLOSION-PROOF EQUIPMENT
          • CONSTRUCTION
          • 8 Enclosure Material
          • 9 Enclosure Thickness
          • 10 Joints in Enclosures
            • 10.1 General
            • 10.2 Cemented joints
            • 10.3 Joints with flamepaths Class I, Groups A, B, C, and D
            • 10.4 Class I, Groups C and D locations
            • 10.5 Class I, Group B locations
            • 10.6 Threaded Joints
          • 11 Shaft Openings
            • 11.1 General
            • 11.2 Non-rotating shafts and shafts rotating at a speed of less than 100 rpm
            • 11.3 Shafts rotating at a speed of 100 rpm or more
          • 12 Holes in Enclosures
          • 13 Drain and Breather Fittings in Enclosures
          • 14 Supply Connections
            • 14.1 Fixed equipment conduit and cable entries
            • 14.2 Cord-connected portable equipment
          • 15 Protection Against Corrosion
          • 16 Materials Applied to Joint Surfaces
          • 17 Devices Having Coated Threaded Joint Surfaces
          • 18 Porosity in Enclosure Materials
          • 19 Polymeric Enclosures
          • PERFORMANCE
          • 20 Temperature Test
          • 21 Explosion Tests
          • 22 Hydrostatic Pressure Test
          • 23 Leakage Test on Factory-Installed Conduit Seals
          • 24 Rust-Resistance Test
          • 25 Tests for Glass Parts
            • 25.1 Thermal-shock test
            • 25.2 Impact test
          • 26 Secureness Test on Supply Connection Hubs
          • 27 Tests on Joint Gaskets
          • 28 Electrical-Resistance Test
            • 28.1 Grounding-continuity of cord-connected equipment
            • 28.2 Equipment having coated threaded joint surfaces or conduit openings
          • 29 Accelerated Aging Test on Bushings
          • 30 Strain-Relief Test
          • 31 Rough-Usage Test
          • 32 Drop Test
          • 33 Non-Metallic Enclosure Materials Tests
            • 33.1 General
            • 33.2 Chemical compatibility by material samples
            • 33.3 Chemical compatibility by complete end product tests
            • 33.4 Test for accumulation of static electricity
          • 34 Chemical Resistance Tests on Sealing and Cementing Compounds
        • PART II – DUST-IGNITION-PROOF EQUIPMENT
          • CONSTRUCTION
          • 35 Enclosure
            • 35.1 General
            • 35.2 Material
            • 35.3 Thickness
          • 36 Joints in Enclosures
          • 37 Shaft Openings
          • 38 Holes in Enclosures
          • 39 Drain and Breather Fittings in Enclosures
          • 40 Supply Connections
            • 40.1 Fixed equipment
            • 40.2 Cord-connected portable equipment
          • 41 Protection Against Corrosion
            • 41.1 General
            • 41.2 Physical properties
            • 41.3 Accelerated air-oven aging test
            • 41.4 Compression set
            • 41.5 Identification
          • 42 Materials Applied to Joint Surfaces
          • PERFORMANCE
          • 43 Dust-Penetration Test
          • 44 Temperature Test with Dust Blanket
          • 45 Polymeric Enclosure Tests
          • 46 Leakage Test on Factory-Installed Conduit Seals
          • 47 Rust-Resistance Test
          • 48 Tests for Glass Parts
          • 49 Secureness Test on Conduit Hubs
          • 50 Tests on Joint Gaskets
          • 51 Electrical-Resistance Test
          • 52 Accelerated-Aging Test on Bushings
          • 53 Strain-Relief Test
          • 54 Rough-Usage Test
          • 55 Drop Test
          • 56 Diaphragm Endurance Test
          • 57 Test for Secureness of Conduit Hubs
            • 57.1 General
            • 57.2 Pullout
            • 57.3 Bending
        • PART III – MANUFACTURING AND PRODUCTION TESTS
          • 58 Bonding Test on Cord-Connected Equipment
          • 59 Hydrostatic Pressure Test
        • PART IV – MARKINGS
          • 60 Details
        • PART V – INDUSTRIAL CONTROL EQUIPMENT
          • Section
          • 61 General
          • CONSTRUCTION
          • 62 Holes in Enclosures
          • PERFORMANCE
          • 63 No-Load Endurance Test
          • MARKINGS
          • 64 Details
        • PART VI – SWITCHES
          • Section
          • 65 General
          • CONSTRUCTION
          • 66 Enclosure Thickness
          • 67 Mounting of Switch Mechanism
          • 68 Spacings
          • 69 Insulating Barrier or Liner
          • RATINGS
          • 70 General
          • MARKING
          • 71 Details
        • PART VII – CIRCUIT BREAKERS
          • Section
          • 72 General
          • CONSTRUCTION
          • 73 General
          • 74 Wiring Space
          • MARKINGS
          • 75 Details
        • PART VIII – OUTLET BOXES AND FITTINGS
          • Section
          • 76 General
          • 77 Material Thickness
          • 78 Supply Connections for Class I Locations
          • 79 Supply Connections for Class II Locations
          • 80 Fitting for Mineral Insulated Cable
          • 81 Conduit Fittings for Sealing
          • 82 Flexible Fittings
          • 83 Mineral Insulated Cable Fittings
          • 84 Cord Connectors for Mobile or Portable Equipment
            • 84.1 General
            • 84.2 Terminal enclosure
            • 84.3 Insulating bases
            • 84.4 Live parts
            • 84.5 Grounding
            • 84.6 Terminals
            • 84.7 Leads
            • 84.8 Spacings
            • 84.9 Insulating barrier or liner
            • 84.10 Seal
            • 84.11 Packing gland
            • 84.12 Cord clamp
            • 84.13 Securement of threaded engagements
            • 84.14 External metal parts
          • PERFORMANCE
          • 85 Explosion Test
          • 86 Hydrostatic Pressure Test
          • 87 Dust Penetration Test
          • 88 Leakage of Sealing Fittings Test
          • 89 High Humidity Tests
          • 90 Leakage of Mineral Insulated Cable Fittings Test
          • 91 Electrical Resistance Test
            • 91.1 Flexible fittings
            • 91.2 Boxes or fittings having coated threaded joint surfaces
          • 92 Arcing Test
          • 93 Bending Test
          • 94 Vibration Test
          • 95 Endurance Load at Elevated Temperature Test
          • 96 Tension Test
          • 97 Moist Ammonia-Air Stress Cracking Test
          • 98 Accelerated Aging of Bushing Test
          • 99 Cord Pull Test
          • 100 Solvent and Water Condensate Exposure Test
          • 101 Secureness of Conduit Hubs Test
          • 102 Markings
        • PART IX – RECEPTACLE-PLUG COMBINATIONS
          • INTRODUCTION
          • 103 General
          • CONSTRUCTION
          • 104 General
          • 105 Material
          • 106 Live Parts
          • 107 Grounding
          • 108 Supply Connection
            • 108.1 Receptacle
            • 108.2 Plug
            • 108.3 Plug and receptacle
          • 109 Receptacle Employing Interlocking Switch or Circuit Breaker
          • 110 Contact and Blade Exposure
          • 111 Spacings
          • 112 Assembly
          • PLUG
          • 113 General
          • 114 Enclosure
          • 115 Strain Relief
          • 116 Bushings
          • 117 Enclosure – Material
          • 118 Seal Between Electrical Enclosure and Receptacle Contacts
          • 119 Bonding
          • PLUG AND RECEPTACLE FOR FLAMMABLE ANESTHETIZING LOCATIONS
          • 120 General
          • PERFORMANCE
          • 121 General
          • 122 Overload Test
          • 123 Normal Temperature Test
          • 124 Strain-Relief Test
          • 125 No-Load Endurance Test
          • 126 Full-Load Endurance Test
          • 127 Test for Arc-Sustaining in the Presence of Explosive Atmospheres
          • 128 Overload Test in the Presence of Explosive Atmospheres
          • 129 Test for Arcing in the Presence of Grain Dust-Air Atmospheres
          • 130 Watertightness Test
          • MARKINGS
          • 131 Details
        • PART X – ELECTRICALLY OPERATED VALVES
          • Section
          • 132 General
          • CONSTRUCTION
          • 133 Enclosure Thickness
          • PERFORMANCE
          • 134 General
          • 135 Temperature Test
          • 136 Burnout Test
          • MARKINGS
          • 137 General
          • 138 Installation Instructions
        • PART XI – TESTS ON POLYMERIC VALVE ENCLOSURES
          • Section
          • 139 General
          • 140 Explosion Tests
          • 141 Hydrostatic Pressure Test
          • 142 Conduit Connection Tests
          • 143 Impact Tests
          • 144 Thermal Cycling Test
          • 145 Thermal Shock Test
          • TESTS ON ENCLOSURES FOR CLASS II VALVES
          • 146 General
          • 147 Test for Accumulation of Static Electricity
          • 148 Dust-Penetration Test
          • 149 Connection Tests
          • 150 Impact Tests
          • 151 Thermal Cycling Test
          • 152 Thermal Shock Test
    • ALTERNATIVE EXPLOSION TESTS