This part of IEC 61241 specifies general requirements for the design, construction, testing and marking of electrical apparatus protected by any recognized safeguard technique for use in areas where combustible dust may be present in quantities that could lead to a fire or explosion hazard.
This Part 0 of EN 61241 covers Category 1D, 2D and 3D apparatus.
Only in cases specifically mentioned, the requirements differ for Categories 1D, 2D and 3D.
In all cases where apparatus are involved, the references to zones shall be read
Zone 20 Category 1D
Zone 21 Category 2D or Category 1D
Zone 22 Category 3D or Category 1D or 2D
This standard is supplemented or modified by the following parts of IEC 61241 concerning specific types of protection:
– Part 1: Protection by enclosures ‘tD’
– Part 2: Protection by pressurization ‘pD’ (under consideration)
– Part 11: Intrinsically safe apparatus ‘iD’
– Part 18: Protection by encapsulation ‘mD’
The application of electrical apparatus in atmospheres which may contain explosive gas as
well as combustible dust, whether simultaneously or separately, requires additional protective
measures.
This standard does not specify requirements for safety, other than those directly related to the
explosion risk.
Where the apparatus has to meet other environmental conditions, for example, protection
against ingress of water and resistance to corrosion, additional methods of protection may be necessary. The method used is not to adversely affect the integrity of the enclosure.
This standard does not apply to dusts of explosives that do not require atmospheric oxygen for combustion, or to pyrophoric substances.
This standard is not applicable to electrical apparatus intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by fire damp and/or combustible dust.
This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust.
2012BS EN 60079-0:2012 Explosive atmospheres. Equipment. General requirements
2009BS EN 60079-0:2009 Explosive atmospheres. Equipment. General requirements
2007BS EN 61241-0:2006 Electrical apparatus for use in the presence of combustible dust - Part 0: General requirements
1999BS EN 50281-1-1:1999 Electrical apparatus for use in the presence of combustible dust - Electrical apparatus protected by enclosures - Construction and testing