Page 6 - Oil+Gas_EN

EX-PROTECTION STANDARDS TYPE OF PROTECTION SYMBOL ZONE DIAGRAM STANDARD
TYPES OF PROTECTION FOR ELECTRICAL EQUIPMENT IN GAS EXPLOSION HAZARD AREAS

IEC 60079-7
DESIGNATION OF ELECTRICAL EQUIPMENT increased safety e 1 EN 60079-7 (ATEX)

ATEX I M1 Ex ia I Ma
flameproof enclosure d 1 IEC 60079-1
IEC Ex ia I Ma EN 60079-1 (ATEX)
ATEX II 1G Ex ia IIC T5/T6 Ga
intrinsic safety ia 0 IEC 60079-11
IEC Ex ia IIC T5/T6 Ga EN 60079-11 (ATEX)
ATEX I M2 Ex d, db I Mb
encapsulation m 1 IEC 60079-18
IEC Ex d, db I Mb EN 60079-18 (ATEX)
ATEX II 2G Ex d, db IIC T4/T6 Gb
IEC Ex d, db IIC T4/T6 Gb
TYPES OF PROTECTION FOR ELECTRICAL EQUIPMENT IN AREAS WITH COMBUSTIBLE DUST
ATEX II 2D Ex tb IIIC T80 °C/T130 °C Db
TYPE OF PROTECTION SYMBOL ZONE DIAGRAM STANDARD
IEC Ex tb IIIC T80 °C/T130 °C Db
NEC 505 Class I, Zone 1 AE x d IIC T4 Gb protection by enclosures tb 21 IEC 60079-31
EN 60079-31 (ATEX)
NEC 500 Class I, Division 1 ABCD T4
old identification: tD A21 = under procedure A for zone 21 (EN 61241-1)
ZONES
GROUPS
dangerous explosive atmosphere continuously, frequently or long-term occasionally not likely to occur and for short periods only
ATEX / IEC / NEC 505 Zone 0 Zone 1 Zone 2 ATEX / IEC / NEC 505 NEC 500
Gas
NEC 500 (Class I) Division 1 Division 2 Group I mines susceptible to firedamp —
ATEX / IEC / NEC 505 Zone 20 Zone 21 Zone 22 Methan
Dust
NEC 500 (Class II, III) Division 1 Division 2 Group II gas explosion hazard areas Class I
Zone 0 (20) includes zones 1 and 2 (21 and 22) subdivisions typical gas subdivisions
IIA Propane Propane Class I Group D
IIB Ethylene Ethylene Class I Group C
IIC Hydrogen Hydrogen Class I Group B
Acetylene Acetylene Class I Group A
Groupe III dust explosion hazard areas Class II/III
subdivisions type of dust subdivisions
IIIA combustible flyings fibres and fluff Class III
IIIB non-conductive dust non-conductive dust Class II Group G
IIIC conductive dust carbonaceous dust Class II Group F
combustible metal dust Class II Group E
EQUIPMENT CATEGORY AND EQUIPMENT PROTECTION LEVEL (EPL)
Subdivision IIC (IIIC) includes subdivisions IIA and IIB (IIIA and IIIB)
ATEX IEC
Equipment group Equipment category EPL sufficient security
TEMPERATURE CLASSIFICATION
mines susceptible to firedamp
I M1 Ma during rare malfunctions Maximum Temperature classes for gases Maximum surface temperature Temperature classes for gases
surface temperature
I M2 Mb until de-energizing of the equipment ATEX / IEC / NEC 500 / 505 ATEX / IEC / NEC 500 / 505
gas explosion hazard areas 450 °C T1 200 °C T3
II 1G Ga Zone 0 during rare malfunctions 300 °C T2 135 °C T4
II 2G Gb Zone 1 during expected malfunctions 100 °C T5
for dusts: indication of the maximum surface temperature in °C
II 3G Gc Zone 2 in normal operation 85 °C T6
dust explosion hazard areas
II 1D Da Zone 20 during rare malfunctions
TYPE OF PROTECTION
II 2D Db Zone 21 during expected malfunctions
II 3D Dc Zone 22 in normal operation IP Type of protection according to IEC/EN 60529

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