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 revision of ANSI/UL 50E dated October 17, 2025 includes the following changes in requirements:

– Ancillary ratings for power wash; 5A.2.1

– Correct reference in Figure 6 Key, note 5

– Addition of definition and clarification on acceptable stainless steel; 5.9A and 7.2.1.1

– Clarification of uncoated ferrous enclosure testing; 7.2.3.1

– Factory-applied sealing compounds; 7.8.1 and 7.8.2

– Revised 8.3.4

– Added Ancillary Rating XH; Corrosion Resistant Hose Down; 9.3A and 9.3B.