1 Marking of electrical equipment for use in potentially explosive atmospheres Conditions and subdivisions Subdivisions of gases and vapours Conditions and subdivisions Required marking on the usable operating equipment Gases and vapours Assignment Temperature Maximum Permissible of gases and vapours accordance class surface temperature Flammable Temporary behaviour Classification Group Equipment Equipment group Equipment to the ignition temperature temperature classes materials of explosive atmosphere of hazardous as defined in category as as defined in protection level of equipment of equipment areas directive defined in directive EN 60079-O (EPL) as defined in 2014/34/EU 2014/34/EU EN 60079-O ammonia, town gas, hydrogen > 450 C T1 450 C T1 to T6.
2 Methane, ethane, acrylnitril gases is present continuously or zone 0 II 1G II Ga propane vapours for long periods or frequently ethyl alcohol, ethylene, ethine > 300 C .. < 450 C T2 300 C T2 to T6. arises in normal zone 1 II 2G or 1G II Gb or Ga cyclohexane, ethylene oxide (acetylene). operation occasionally n-butane is not likely toarise in normal zone 2 II 3G or II Gc or gasoline, ethylene glycol, > 200 C .. < 300 C T3 200 C T3 to T6. operation, or if it does, will 2G or 1G Gb or Ga n-hexane hydrogen sulphide persist for a short time only dusts is present in the form of a zone 20 II 1D III Da cloud continuously, or for acetaldehyde ethyl-ether > 135 C.
3 < 200 C T4 135 C T4 to T6. long periods or frequently > 100 C .. < 135 C T5 100 C T5 to T6. occasionally develops zone 21 II 2D or 1D III Db or Da sulphide of carbon > 085 C .. < 100 C T6 85 C T6. into a cloud during normal operation is not likely to develop into zone 22 II 3D or III Dc or a cloud during normal operation, 2D or1D Db or Da or if it does, for a short time only Explosion groups methane operation where there is - I M1 I Ma IIA IIB IIC. carbon dust a risk of explosion Permissible equipment groups disconnection where there - I M2 or M1 I Mb or Ma is a risk of explosion IIA, IIB, IIC IIB, IIC IIC.
4 Gas NB1) II 2G Ex db eb IIC T6 Gb NB1) 16 ATEX 1234 X. Dust NB1) II 2D Ex tb IIIC T120 C Db NB1) 16 ATEX 1234 X. Protection principle/types of protection Use of the operating equipment Applications Flammable materials Protection principle Type of protection Symbol Marking in accordance with the equipment protection level Norm Marking Conditions a = very high level of protection b = high level of protection c = enhanced level of protection operating equipment can be used without without all applications gases, vapours (G) and dusts (D)
5 General requirements + + + EN 60079-0 restriction X special conditions of use control stations, motors, fuses, gases and vapours (G) propagation of an explosion flameproof enclosure Ex da Ex db Ex dc EN 60079-1. switchgear, power electronics inside to the outside is excluded U operating equipment with partial certificate, CE-conformity is certified when it is installed into a complete item of operating apparatus junction and connection boxes, gases and vapours (G) avoidance of arcs, sparks and increased safety Ex eb Ex ec EN 60079-7.
6 Enclosures, motors, lights, excessive temperature terminals Ignition temperature of dust junction and connection boxes, dusts (D) explosive dust atmosphere keep at protection by enclosure Ex ta Ex tb Ex tc EN 60079-31 permissible temperature of Tadm. C = T 5 mm C - 75 K. enclosures, motors, lights, switch a distance from the ignition source the layer and control cabinets, plugs permissible temperature of Tadm. nuage = 2/3 Tnuage the cloud measurement and control gases, vapours (G) and dusts (D) limitation of energy as well as arcs intrinsic safety Ex ia Ex ib Ex ic EN 60079-11.
7 Technology, automation technology, and temperature EN 60079-25 max. permissible surface Tadm. C > Tadm. < Tadm. nuage sensors, actuators EN 60079-27 temperature of the equipment switch and control stations, gases, vapours (G) and dusts (D) explosive atmosphere keep at a pressurization Ex pxb Ex pzc EN 60079-2. motors, analyzers, computers distance from the ignition source Ex pyb Groups of dust coils of motors or relays, gases, vapours (G) and dusts (D) explosive atmosphere keep at a encapsulation Ex ma Ex mb Ex mc EN 60079-18.
8 Solenoid valves, distance from the ignition source Marking Dusts Permissible connection systems equipment group IIIA combustible flyings IIIA, IIIB, IIIC. transformers, relays, gases and vapours (G) explosive atmosphere keep at a oil immersion Ex ob Ex oc EN 60079-6. control stations, distance from the ignition source IIIB non-conductive dust IIIB, IIIC. magnetic contactors conductive dust IIIC IIIC. capacitors, transformers, relays gases and vapours (G) an propagation of an explosion powder filling Ex qb EN 60079-5. inside to the outside is excluded all applications for zone 2 gases and vapours (G) all protection principles for zone 2 n type of protection Ex nC EN 60079-15.
9 Ex nR. Optical devices, laser scanners, gases, vapours (G) and dusts (D) Energy restriction of ignition sparks Inherent safe optical radiation Ex op is EN 60079-28. light barriers, LED lamps, and temperature fibre-optic cables Optical fibres, fibre-optic cables gases, vapours (G) and dusts (D) Ex atmosphere is kept distant from Protected optical radiation Ex op pr EN 60079-28. the ignition source D-D-WEG250608-07/2016-BARTECW erbeAgentur-286323. Optical fibres, fibre-optic cables gases, vapours (G) and dusts (D) Ex atmosphere is kept distant from Optical system with Ex op sh EN 60079-28.
10 The ignition source interlocking Marking according directive 2014/34/EU. according norm EN 60079-0 ff 1) Notified Bodies' identification number BAM 0589 (Germany), DEKRA EXAM 0158 (Germany), EECS (BASEEFA) 0600 (Great Britain), IBExU 0637 (Germany), KEMA 0344 (Netherlands), LCIE 0081 (France), PTB 0102 (Germany), Application in hazardous area SIRA 0518 (Great Britain), T V 0044 (Germany), who where required have certified the QA system or inspected the products (for Categories 1 and 2) Zone 0/20 Zone 1/21 Zone 2/22. Zone 1/21 Zone 2/22.