Appendix

Comparison of IEC publications and European standards (EN)

Electrical apparatus for explosive gas atmospheres:

IEC EN (new) EN (old)
General requirements IEC 60079-0 EN 60079-0 EN 50 014
Flameproof enclosures »d« IEC 60079-1 EN 60079-1 EN 50 018
Construction and verification test of flameproof enclosures of electrical apparatus IEC 60079-1-1
Pressurized enclosures »p« IEC 60079-2 EN 60079-2 EN 50 016
Method of test for ignition temperature IEC 60079-4
Powder filling IEC 60079-5 EN 60079-5 EN 50 017
Oil-immersion »o« IEC 60079-6 EN 60079-6 EN 50 015
Increased safety »e« IEC 60079-7 EN 60079-7 EN 50 019
Classification of hazardous areas IEC 60079-10 EN 60079-10
Intrinsic safety »i« IEC 60079-11 EN 60079-11 EN 50 020
Classification of mixtures of gases or vapors with air according to their maximum experimental safe gaps and minimum ignition currents IEC/TR 60079-12
Construction and use of rooms or buildings protected by pressurization IEC/TR 60079-13
Electrical installations in hazardous areas (other than mines) IEC 60079-14 EN 60079-14
Type of protection »n« IEC 60079-15 EN 60079-15 EN 50 021
Artificial ventilation for the protection of analyzer(s) houses IEC/TR 60079-16
Inspection and maintenance of electrical installations in hazardous areas (other than mines) IEC 60079-17 EN 60079-17
Encapsulation »m« IEC 60079-18 EN 60079-18 EN 50 028
Repair and overhaul for apparatus used in potentially explosive atmospheres (other than mines or explosives) IEC 60079-19 EN 60079-19
Data for flammable gases and vapors, relating to the use of electrical apparatus IEC/TR 60079-20
Intrinsically safe systems IEC 60079-25 EN 60079-25
Electrical equipment for zone 0 IEC 60079-26 EN 60079-26 EN 50 284
Fieldbus Intrinsically Safe COncept (FISCO) and Fieldbus NonIncendive COncept (FNICO) IEC 60079-27 EN 60079-27
Protection of devices and transmission systems which work with optical radiation EN 60079-28
Electrical apparatus for the detection and measurement of flammable gases – general requirements and performance requirements EN 60079-29-1

Electrical apparatus for use in the presence of combustible dust:

IEC (new) IEC (old) EN (new) EN (old)
General requirements IEC 61241-0 IEC 61241-1-1 EN 61241-0 EN 50281-1-1
Protected by enclosures »tD« IEC 61241-1 IEC 61241-1-1 EN 61241-1 EN 50281-1-1
Pressurized enclosures »pD« IEC 61241-4 EN 61241-4
Classification of potentially explosive dust atmospheres EN 61241-10
Intrinsic safety »iD« IEC 61241-11 EN 61241-5 EN 61241-11
Selection and installation EN 61241-14
Inspection and maintenance of electrical installations in hazardous areas (other than mines) EN 61241-17
Encapsulation »mD« IEC 61241-18 EN 61241-18
Test methods: minimum ignition temperature IEC 61241-2-1 EN 50281-2-1
Test methods: resistivity of dust in layers IEC 61241-2-2 EN 61241-2-2
Test methods: minimum ignition energy IEC 61241-2-3

Remark: some of the standards are still in preparation!

Safety characteristics of flammable gases and vapors

Safety ratings: ignition temperature, temperature class and explosion group:

Material Ignition temperature °C Temperature class Explosion group
1,2-Dichloroethane 440 T 2 II A
Acetaldehyde 155 T 4 II A
Acetone 535 T 1 II A
Acetylene 305 T 2 II C³
Ammonia 630 T 1 II A
Gasolines 220 bis 300 T 3 II A
Benzene (pure) 555 T 1 II A
Cyclohexanone 430 T 2 II A
Diesel fuels 220 T 3 II A
Acetic acid 485 T 1 II A
Acetic anhydride 330 T 2 II A
Ethane 515 T 1 II A
Ethyl acetate 470 T 1 II A
Ethanol 400 T 2 II B
Ethyl chloride 510 T 1 II A
Ethene 440 T 2 II B
Ethylene oxide 435 (self-decomposing) T 2 II B
Ethyl ether 175 T 4 II B
Ethyl glycol 235 T 3 II B
Fuel oil EL, L, M, S 220 bis 300 T 3 II A
i-Amyl acetate 380 T 2 II A
Carbon monoxide 605 T 1 II A
Methane 595 T 1 II A
Methanol 440 T 2 II A
Methyl chloride 625 T 1 II A
Naphthalene 540 T 1 II A
n-Butane 365 T 2 II A
n-Butanol 325 T 2 II B
n-Hexane 230 T 3 II A
n-Propyl alcohol 385 T 2 II B*
Phenol 595 T 1 II A
Propane 470 T 1 II A
Carbon disulfide 95 T 6 II C¹
Hydrogen sulfide 270 T 3 II B
Toluene 535 T 1 II A
Hydrogen 560 T 1 II C²

Remark: some of the standards are still in preparation!
*The gas group for this substance has not yet been determined.
¹Also gas groups II B + CS2
²Also gas groups II B + H2
³Also gas groups II B + C2 H2

Protection classes of enclosures according to IEC 60 529 - IPXX:

Digit
First digit
Physical protection
Foreign body protection Second digit
Water protection
0 No protection No protection No protection
1 Protection against back of hand contact Protection against solid foreign bodies 50 mm ø Protection against water drops falling vertically
2 Protection against finger contact Protection against solid foreign bodies 12.5 mm ø Protection against water drops falling at an angle (15 °)
3 Protection against contact from tools Protection against solid foreign bodies 2.5 mm ø Protection against water-spray at an angle up to 60 °
4 Protection against contact with a wire Protection against solid foreign bodies 1.0 mm ø Protection against water spray from all directions
5 Protection against contact with a wire Protection against dust Protection against water jets
6 Protection against contact with a wire Dust-tight Protection against strong water jets
7 Protection against intermittent immersion in water
8 Protection against continuous immersion in water