PDF Standards UL 120404

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Pressurized Enclosures
UL 120404
1 Scope

1.1 This standard applies to equipment made suitable for use in hazardous (classified) locations by pressurizing.

1.2 This standard applies both to equipment with and without an internal release of a flammable gas or vapor.

1.3 This standard does not apply to occupied portions of buildings such as ventilated or pressurized control rooms.

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