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:

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

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

Summary of Topics

This new edition of ANSI/UL 50E dated October 15, 2020 includes the following changes in requirements:

Adhesives Used to Secure Observation Windows; 7.1.1, 7.1.3, 7.1.4, Annex B

Alternate Investigation to Tensile Strength and Elongation Test for Gaskets; 7.7.1, Section 8.13.5

Clarification of Additional Corrosion Protection; 7.2.1.1

Expand Eligible Grades of Austenitic Stainless Steel in UL 50E; Title of Section 7.2.3, 7.2.4.1, 8.8.1.1, 8.8.2.1.1, Section 8.9

Alternative Aging for Gasket Tensile Strength and Elongation Tests; 8.13.2.1, 8.13.2.2

Allowance of X Ray Spectrometry for Metallic Coating Thickness Test; 7.2.3.1, Annex B

Allowance for Type Rated Ventilated Enclosures; 7.3.1.1, 7.3.5.1, 7.4.3.2, 7.5.1, 8.1.2, 8.4.1.1.1, 8.4.2.1.1.2, 8.4.2.2.1.1, Table 1, Table 2, Table 6

Orientation of Sample for Hosedown Test; 8.4.1.2.1 – 8.4.1.2.3, 8.6.1 – 8.6.3

Length of Conduit for Misalignment Test; 8.15.1.2, 8.15.1.3

Required Torque for Conduit Hubs for Misalignment Test; 8.15.1.1

Sealants Used with Enclosures; Sections 7.8 and 8.17

New Annex E for Adhesives, Enclosures, Non-mechanical Means of Securement; Annex B

Requirements for Encapsulated Enclosures; Annex F

Typo Correction in Table 4