EN 50020:1977

Electrical apparatus for potentially explosive atmospheres - Intrinsic safety 'i'

Scope

This European Standard contains the specific requirements for construction and testing of intrinsically safe electrical apparatus, type of protection i, intended for use in potentially explosive atmospheres. This European Standard supplements European Standard EN 50 014 General Requirements, the requirements of which apply to intrinsically safe electrical apparatus, and to associated electrical apparatus with some exceptions. If associated electrical apparatus is protected by a type of protection listed in European Standard EN 50014 General requirements, the requirements of that standard apply in the conditions of application of the European Standard for the type of protection concerned. This European Standard applies to electrical apparatus in which the electrical circuits themselves are incapable of causing explosion in the surrounding atmosphere. This European Standard applies also to electrical apparatus or parts of electrical apparatus located outside the potentially explosive atmosphere or protected by another type of protection listed in European Standard EN 50 014 General Requirements, where the intrinsic safety of the electrical circuits in the potentially explosive atmosphere may depend upon the design and construction of such electrical apparatus or parts of such electrical apparatus. Note: the permitted methods of interconnection of intrinsically safe electrical apparatus and associated electrical apparatus are specified in another European Standard (in preparation)

Related legislation

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