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Explosive atmospheres -- Equipment. General requirements
This part of IECĀ 60079 specifies the general requirements for construction, testing and marking of electrical equipment and Ex Components intended for use in explosive atmospheres.
The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that electrical equipment can be operated are:
temperature ā20Ā Ā°C to +60Ā Ā°C;
pressure 80Ā kPa (0,8Ā bar) to 110Ā kPa (1,1Ā bar); and
air with normal oxygen content, typically 21Ā % v/v.
This standard and other standards supplementing this standard specify additional test requirements for equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for equipment operating outside the standard atmospheric pressure range and standard oxygen content, particularly with respect to types of protection that depend on quenching of a flame such as ā flameproof enclosure ād?ā ( IECĀ 60079ā1 ) or limitation of energy, āintrinsic safety āi?ā ( IECĀ 60079ā11 ).
Although the standard atmospheric conditions above give a temperature range for the atmosphere of - 20Ā Ā°C to +60Ā Ā°C, the normal ambient temperature range for the equipment is ā20Ā Ā°C to +40Ā Ā°C, unless otherwise specified and marked. SeeĀ 5.1.1. It is considered that ā20Ā Ā°C to +40Ā Ā°C is appropriate for most equipment and that to manufacture all equipment to be suitable for a standard atmosphere upper ambient temperature of +60Ā Ā°C would place unnecessary design constraints.
Requirements given in this standard result from an ignition hazard assessment made on electrical equipment. The ignition sources taken into account are those found associated with this type of equipment, such as hot surfaces, mechanically generated sparks, mechanical impacts resulting in thermite reactions, electrical arcing and static electric discharge in normal industrial environments.
It is acknowledged that, with developments in technology, it may be possible to achieve the objectives of the IECĀ 60079 series of standards in respect of explosion prevention by methods that are not yet fully defined. Where a manufacturer wishes to take advantage of such developments, this International Standard, as well as other standards in the IECĀ 60079 series, may be applied in part. It is intended that the manufacturer prepare documentation that clearly defines how the IECĀ 60079 series of standards has been applied, together with a full explanation of the additional techniques employed. The designation āEx s? has been reserved to indicate special protection. A standard for special protection ās?, IECĀ 60079ā33 , is in preparation.
Where an explosive gas atmosphere and a combustible dust atmosphere are, or may be, present at the same time, the simultaneous presence of both should be considered and may require additional protective measures.
This standard does not specify requirements for safety, other than those directly related to the explosion risk. Ignition sources like adiabatic compression, shock waves, exothermic chemical reaction, self ignition of dust, naked flames and hot gases/liquids, are not addressed by this standard.
Such equipment should be subjected to a hazard analysis that identifies and lists all of the potential sources of ignition by the electrical equipment and the measures to be applied to prevent them becoming effective.
This standard is supplemented or modified by the following standards concerning specific types of protection:
IECĀ 60079ā1 : Gas ā Flameproof enclosures 'd';
IECĀ 60079ā2 : Gas ā Pressurized enclosures 'p';
IECĀ 60079ā5 : Gas ā Powder filling 'q';
IECĀ 60079ā6 : Gas ā Oil immersion 'o';
IECĀ 60079ā7 : Gas ā Increased safety 'e';
IECĀ 60079ā11 : Gas ā Intrinsic safety 'i';
IECĀ 60079ā15 : Gas ā Type of protection ān?;
IECĀ 60079ā18 : Gas and dust ā Encapsulation 'm';
IECĀ 60079ā31 : Dust ā Protection by enclosure āt?
IECĀ 61241ā4 : Dust ā Pressurization āpD?.
Additional information on types of protection for non-electrical equipment can be found in ISO/IECĀ 80079ā36 (to be published).
This standard is supplemented or modified by the following equipment standards:
IECĀ 60079ā13 : Explosive atmospheres ā PartĀ 13: Equipment protection by pressurized roomāp?
IECĀ 60079ā25 : Explosive atmospheres ā PartĀ 25: Intrinsically safe electrical systems
IECĀ 60079ā26 : Explosive atmospheres ā PartĀ 26: Equipment with equipment protection level (EPL) Ga
IECĀ 60079ā28 : Explosive atmospheres ā PartĀ 28: Protection of equipment and transmission systems using optical radiation
IECĀ 62013ā1 : Caplights for use in mines susceptible to firedamp ā PartĀ 1: General requirements ā Construction and testing in relation to the risk of explosion
IECĀ 60079ā30ā1 : Explosive atmospheres ā PartĀ 30-1: Electrical resistance trace heating ā General and testing requirements.
This standard with the additional standards mentioned above, are not applicable to the construction of
electromedical apparatus,
shot-firing exploders,
test devices for exploders, and
shot-firing circuits.
| SDO | BSI: British Standards Institution |
| Document Number | EN 60079-0 |
| Publication Date | Dec. 31, 2014 |
| Language | en - English |
| Page Count | |
| Revision Level | |
| Supercedes | |
| Committee | EXL/31 |
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