Top level standard

EN1127-1    Explosive atmospheres: Explosion prevention and protection.  Part 1: Basic concepts and methodology

Standards for Equipment

 IEC 60079-      ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES

Part 0       General requirements

Part 1       Construction and test of flameproof enclosures of electrical apparatus

Part 2       Electrical apparatus - type of protection ‘p’

Part 3       Spark test apparatus for intrinsically safe circuits

Part 4       Method of test for ignition temperature

Part 5       Powder filling ‘q’

Part 6       Oil-immersion ‘o’

Part 7       Increased safety ‘e'

Part 11     Construction and test of intrinsically safe and associated apparatus

Part 15     Electrical apparatus for explosive gas atmospheres, type of protection ‘n’

Part 18     Encapsulation ‘m’

Part 25     Intrinsically safe systems

Part 26     Special requirements for construction test and marking of zone 0 electrical apparatus

Part 27     Fieldbus intrinsically safe concept (FISCO)

Standards for Installation etc. (gases and vapours)

 IEC 60079-      ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES

Part 10    Classification of hazardous areas

Part 14    Installation (and selection) of equipment in hazardous areas

Part 17    Inspection and maintenance of equipment

Note that the 60079 series of standards will gradually address dust hazards as well as gas/vapour hazards. The standard number will have an additional suffix 1 or 2. Thus, for example, 61241-14 (see below) will be replaced by 60079-14-2 [installation for equipment in dust hazards], with 60079-14-1 dealing with installations in gas/vapour hazards.

Standards for Dust Hazard Equipment and Installation

IEC 61241        ELECTRICAL APPARATUS FOR USE IN THE PRESENCE OF COMBUSTIBLE DUST

Part 0       General Requirements

Part 1       Protection by enclosure ‘tD’

Part 2-1     Methods for determining the minimum ignition temperature of dusts

Part 2-2     Method for determining the resistivity of dust in layers

Part 2-3     Method for determining minimum ignition energy of dust air mixtures

Part 4       Type of protection ‘pD’

Part 10     Classification of areas where combustible dusts are or may be present

Part 11     Protection by intrinsic safety ‘iD’

Part 14     Selection and installation

Part 17     Inspection and maintenance

Part 18     Protection by encapsulation ‘mD’