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 Second Edition of UL 50E was issued to include the following requirements:

Addition of environmental Type ratings 3X, 3RX, and 3SX

Revisions to the Gasket Compression Test

Brass inserts for enclosures

Revisions to specify tightening torque for field installed screws and fasteners critical to maintaining the environmental integrity of an enclosure

Elimination of Hand Flexing Test for Gaskets