1.1 This European Standard contains the specific requirements for construction and testing of electrical apparatus, parts of electrical apparatus and Ex components in the type of protection encapsulation "m", intended for use in potentially explosive atmospheres.
1.2 This European Standard applies to electrical apparatus, parts of electrical apparatus and Ex components which have rated voltages not exceeding 11 kV.
1.3 This European Standard supplements European Standard EN 50 014 'General requirements', with the following exceptions.
Clauses of El jropean Standard EN 50 014
which are not applicable
4.1 Maximum surface temperature
(for Ex components)
5.2 Time delay before opening an enclosure
6.1 Definition of the enclosure material
6.2 (first Temperature index TI
paragraph)
6.4 Threaded holes in enclosures of plastic
material
8 Fasteners
9 Interlocking devices
15 Cable and conduit entries
17 Switchgear
18 Fuses
20.2 Warning label for luminaires
22.4.3.1 Impact tests (for Ex components)
22.4.4 Tests for degree of protection for
enclosures
22.4.8 Tests in explosive mixtures
22.4.9 Tests of clamping of non-armoured
cables in cable entries
22.4.10 Tests of clamping of armoured cables in
cable entries
SIS SS EN 50 028-1989 history
1989SIS SS EN 50 028-1989 Electrical apparatus for potentially explosive atmospheres — Encapsulation "m"