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 6.

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

1.5 Deleted.

Summary of Topics

This revision to ANSI/UL 1203 dated August 19, 2020 includes the following changes in requirements:

Revisions to permit the use of electronic medium for required documentation; 13.4, 14.2.3.5, 60.15, 60.21, Section 60A, 64.6, 86.4, 88.2, 88.3, 102.1, 102.8, 102.11, 102.13, 131.5, 137.3, 138.1.

Revisions to add details for the construction and testing of blanking elements (close-up plugs) and thread adapters; 7.17, 7.18, 76.2, Section 76.3, 85.1, 86.1, Table 86.4, Sections 86.6 and 86.7.

Revision to align the terms used in UL 1203 with the defined terms in NFPA 70 for Explosionproof and Dust-Ignitionproof types of protection; multiple paragraphs.