This document specifies the requirements for the design, assessment, construction and testing of equipment intended for use in potentially explosive gas or dust atmospheres, protected by the type of protection: Flameproof enclosure "d". This document supplements the requirements in EN 13463-1, the contents of which also apply in full to equipment constructed to this document. Equipment complying with the relevant clauses of this document meets the requirements for the following categories: Equipment Group I Category M2 - that does not contain an ignition source arising from severe operating conditions, in particular arising from rough handling and changing environmental conditions; Equipment Group II Category 2G or 2D - that does not contain an ignition source arising as a result of foreseeable malfunctions. The type of ignition protection described in the document can be used either on its own or in combination with other types of ignition protection to meet the requirements for equipment of Group I categories M2, or Group II categories 1 and 2 depending on the ignition hazard assessment in EN 13463-1. NOTE The requirements for Group I Category M1 equipment are given in EN 50303, which specifies the requirements for both electrical and non-electrical equipment. This document shall not be used for equipment intended for use in sulphur dust and organic peroxides because of the difficulty of testing and specifying the requirements This document does not apply to the ignition protection of electrical equipment, or reciprocating internal combustion engines. For these requirements reference shall be made to EN 60079-0 and EN 60079-1 for electrical equipment and EN 1834-1, -2 and -3 for reciprocation internal combustion engines.