UL 50
Enclosures for Electrical Equipment, Non-Environmental Considerations

DETAILS
Edition Number:13SCC Approved:--
Edition Date:2015-10-16DOD Approved: --
Price Code:CANSI Approved: 2015-09-30
Type:ulcsance

  • SCOPE

    1 Scope

    1.1 This standard applies to enclosures for electrical equipment intended to be installed and used in non-hazardous locations in accordance with the Canadian Electrical Code, Part I, CSA C22.1, the provisions of the National Electrical Code, NFPA 70, and the provisions of Mexico's Electrical Installations, NOM-001-SEDE, as follows:

    a)    Enclosures for indoor locations, Types 1, 2, 5, 12, 12K, and 13; and

    b)    Enclosures for indoor or outdoor locations, Types 3, 3X, 3R, 3RX, 3S, 3SX, 4, 4X, 6, and 6P.

    1.2 This standard covers the non-environmental construction and performance requirements for enclosures to provide a degree of protection to personnel against incidental contact with the enclosed equipment. The additional environmental construction and performance requirements for enclosures are located in CSA C22.2 No. 94.2, UL 50E, and NMX-J-235/2-ANCE (See Annex b, Ref. No. 15), which are intended to be used in conjunction with this standard.

    1.3 Where an individual product standard contains requirements that are at variance with those of this standard, the requirements of the individual product standard take precedence.

    1.4 In the United States and Mexico, cabinets and cutout boxes and junction and pull boxes are covered by Clauses 9 and 10 of this Standard. In Canada, junction boxes, cutout boxes, and pull boxes are covered by CSA C22.2 No. 40 and are not covered by this standard. See Annex b, Ref. No. 12.

    1.5 Outlet boxes having a volume of not more than 1640 cm3 (100 in3) are covered by CSA C22.2 No. 18.1, NMX-J-023/1-ANCE, and the UL 514 series (see Annex b, Ref. No. 6 and 13) and are not covered by this standard.

    1.6 In Canada and the United States , swimming pool type junction boxes are covered by CSA C22.2 No. 89 and UL 1241 (see Annex b, Ref. No. 11) and are not covered by this standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • ENCLOSURES FOR ELECTRICAL EQUIPMENT, NON-ENVIRONMENTAL CONSIDERATIONS
        • 1 Scope
        • 2 Units of Measurement
        • 3 Components
        • 4 References
        • 5 Definitions
        • 6 Construction
          • 6.1 General
          • 6.2 Observation windows
          • 6.3 Openings
          • 6.4 Sheet metal enclosures
          • 6.5 Cast metal enclosures
          • 6.6 Polymeric materials
          • 6.7 Covers and doors
          • 6.8 Hinges
          • 6.9 Latches and handles
          • 6.10 Connections for wiring systems
          • 6.11 Conduit hubs
          • 6.12 Field-installed accessories/kits
        • 7 Marking
          • 7.1 Enclosures and accessories/kits
          • 7.2 Cast metal enclosure
          • 7.3 Cast-aluminum enclosure
          • 7.4 Extension
          • 7.5 Insulating material
          • 7.6 Polymeric enclosure
          • 7.7 Conduit hubs, closure plates, and other equipment
          • 7.8 Ventilated Type 1, 2, 3R, or 3RX enclosures
        • 8 Tests
          • 8.1 Comparative deflection test (enclosure)
          • 8.2 Deflection test (doors and covers)
          • 8.3 Hinge strength test
          • 8.4 Multiple knockouts test
          • 8.5 Polymeric enclosures – bonding test
          • 8.6 Polymeric enclosures – rigid metallic conduit connection test
          • 8.7 Metallic enclosure threaded opening test
          • 8.8 Metallic enclosure conduit hub test
          • 8.9 Rod entry test
          • 8.10 Crushing resistance test
          • 8.11 Mold stress relief test
        • 9 Cabinets and Cutout Boxes
          • 9.1 General
          • 9.2 Sheet metal cabinets
        • 10 Junction and Pull Boxes
          • 10.1 General
          • 10.2 Covers and doors
          • 10.3 Conduit openings
          • 10.4 Equipment grounding
          • 10.5 Removable sides
          • 10.6 Marking details
        • 11
        • 12
    • Annex A – Standards For Components (Normative)
    • Annex B – Reference Standards(Normative)
    • Annex C – Marking (Normative – US Only Requirement)
    • Annex D – Knockout Dimensions (Informative)