1 Scope

1.1 These requirements cover explosionproof and dust-ignitionproof 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 explosionproof electrical equipment for installation and use in Class I, Zone 1, Groups IIA, IIB, and IIC hazardous (classified) locations and dust-ignitionproof equipment for use in Zone 20, 21, and 22 locations.

1.3 These requirements also cover explosionproof 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 March 31, 2021 includes the following changes in requirements:

– Revisions to add number of ignitions column to Table 21.3A and Table SB1.6.

– Editorial Revision to include the Clause 60.17 reference to the Exception of Clause 21.17 as Clause 60.17 references Exception to 21.17; however, 21.17 Exception does not provide a reference to Clause 60.17.