Classification And Protection Of Hazardous Areas

The classification of hazardous areas of global main explosion-proof system and corresponding protection methods

Hazardous Locations Marking Examples

Markings for Global IECEx System/for China

Area Classification-Division Versus Zone

Type of Area	NEC and CEC(North America)	IEC,China and CENELEC
Continuous Hazard	Division 1 or Zone 0/Zone 20	Zone 0/Zone 20
Intermittent Hazard	Division 1 or Zone 1/Zone 21	Zone 1/Zone 21
Hazard Under Abnormal Conditions	Division 2 or Zone 2/Zone 22	Zone 2/Zone 22

ATEX Equipment Category and IEC/IECEx Equipment Protection Level

Equipment Group	ATEX Equoipment Category	Environment	IEC/EN Explosion Protection Level	Level of Protection	Presence or Duration of Explosive Atmosphere	Correlation with Hazardous Areas

I	M1	Mine (Methane, Coal dust)	Ma	Very High	Presence

	M2		Mb	High	Risk of Presence
II	1	G-Gas	Ga(for gas) Very	High	Continuous presence	Zone 0(Gas/Vapor)
	2		Ga(for gas)	High	Likely to occur	Zone 1(Gas/Vapor)
	3		Ga(for gas)	Lower	Unlikely to occur	Zone 2(Gas/Vapor)
III	1	D-Dust	Da(for dust) Very	High	Continuous presence	Zone 20(Dust)
	2		Da(for dust)	High	Likely to occur	Zone 21(Dust)
	3		Da(for dust)	Lower	Unlikely to occur	Zone 22(Dust)

Explosive/Flammable/Combustible Atmosphere/Environment Grouping

Division System		Zone System
Typical Gas/Dust Fibers/Flyings	Canada(CEC)	Canada(CEC)	Typical Gas/Dust Fibers/Flyings
Acetylene	Class I,Group A	Group IIC	Acetylene
Hydrogen	Class I,Group B	Group IIC	Hydrogen
Ethylene	Class I,Group C	Group IIB	Ethylene
Propane	Class I,Group D	Group IIA	Propane
Methane(Mines)	Gaseous Mines	Group I	Methane(Mines)
Metal Dusts	Class II,Group E	Group IIIC	Conductive Dusts
Coal Dusts	Class II,Group F	Group IIIB	Non-Conductive Dusts
Grain Dusts	Class II,Group G	Group IIIB	Non-Conductive Dusts
Fibers/Flyings	Class II	Group IIIA	Combustible Flyings

Temperature Code & Temperature Class

Maximum Surface Temperature(℃)	US(NEC) Canada(CEC)	IEC,China,European Canada(CEC)
450	T1	T1
300	T2	T2
280	T2A	-
260	T2B	-
230	T2C	-
215	T2D	-
200	T3	T3
180	T3A	-
165	T3B	-
160	T3C	-
135	T4	T4
120	T4A	-
100	T5	T5
85	T6	T6

Ingress Protection(IP)Codes

First Numeral-Protection Against Solid Bodies
0	No Protection
1	Objects greater than 50mm
2	Objects greater than 12.5mm
3	Objects greater than 2.5mm
4	Objects greater than 1.0mm
5	Dust-Protected
6	Dust-Tight

Temperature Code & Temperature Class

Maximum Surface Temperature(℃)	US(NEC) Canada(CEC)	IEC,China,European Canada(CEC)
450	T1	T1
300	T2	T2
280	T2A	-
260	T2B	-
230	T2C	-
215	T2D	-
200	T3	T3
180	T3A	-
165	T3B	-
160	T3C	-
135	T4	T4
120	T4A	-
100	T5	T5
85	T6	T6

Protection Methods for Potentially Explosive Gas/Vapor Atmospheres

Second Numeral-protection Against Water
0	No Protection
1	Vertical Dripping
2	Angled Dripping(15°titled)
3	Spraying
4	Splashing
5	Jetting
6	Powerful Jetting
7	Temporary Immersion
8	Continuous Immersion

Protection Methods for Potentially Explosive Gas/Vapor Atmospheres(continue the above table)

TYPE OF PROTECTION	CODE	MARKET	APPLICATION	STANDARD	PROTECTION PRINCIPLE

General Requirements for Hazardous Locations	Ex Ex AEx Ex Ex	IEC China US US CA EU	EPL Ga,Gb,&Gc EPL Ga,Gb,&Gc Class I,Division I &2 Class I,Zone I &2 Class I,Zone I &2 Category 1G,2G&3G	IEC 60079-0 GB 3836.1 FM 3600 ISA 60079-0 CSA C22.2 No.60079-0 EN 60079-0





Incareased Safety	Ex e (or Ex eb) Ex e (or Ex eb) AEx e (or AEx eb) Ex e Ex e (or Ex eb)	IEC China US CA EU	EPL Gb EPL Gb Class I,Zone 1 Class I,Zone 1 Category 2G	IEC 60079-7 GB 3836.3 ISA 60079-7 CSA C22.2 No.60079-07 EN60079-7




Non-Incendive	(NI) (NI)	US CA	Class I,Division 2 Class I,Division 2	ISA 12.12.01/FM 3611 CSA C22.2 No.213	No arcs sparks or hot surfaces


Non-Sparking	Ex nA (or Ex nAc) Ex nA (or Ex nAc) AEx nA (or AEx nAc) Ex nA Ex nA (or Ex nAc)	IEC China US CA EU	EPL Gc EPL Gc Class I,Zone 2 Class I,Zone 2 Category 3G	IEC 60079-15 GB 3836.8 ISA 60079-15 CSA C22.2 No.60079-15 EN 60079-15




Non-Sparking	Ex nA (or Ex nAc) Ex nA (or Ex nAc) AEx nA (or AEx nAc) Ex nA Ex nA (or Ex nAc)	IEC China US CA EU	EPL Gc EPL Gc Class I,Zone 2 Class I,Zone 2 Category 3G	IEC 60079-15 GB 3836.8 ISA 60079-15 CSA C22.2 No.60079-15 EN 60079-15




Explosion-proof	(XP) (XP)	US CA	Class I,Division 1 Class I,Division 1	UL 1203/FM 3615 CSA C22.2 No.30

Flame-proof	Ex d (or Ex db) Ex d (or Ex db) AEx d (or AEx db) Ex d Ex d (or Ex db)	IEC China US CA EU	EPL Gb EPL Gb Class I,Zone 1 Class I,Zone 1 Category 2G	IEC 60079-1 GB 3836.2 ISA 60079-1 CSA C22.2 No.60079-1 EN 60079-1	Control the explosion and extinguish the flame




Enclosed Break	Ex nC (or Ex nCc) Ex nC (or Ex nCc) AEx nC (or AEx nCc) Ex nC Ex nC (or Ex nCc)	IEC China US CA EU	EPL Gc EPL Gc Class I,Zone 2 Class I,Zone 2 Category 3G	IEC 60079-15 GB 3836.8 ISA 60079-15 CSA C22.2 No.60079-15 EN 60079-15





Intrinsic Safety	Ex ia,ib,ic Ex ia,ib,ic (IS) (IS) AEx ia AEx ib Ex ia Ex ib Ex ia,ib,ic AEx ic Ex ic	IEC China US CA US US CA CA EU US CA	EPL Ga,Gb,Gc EPL Ga,Gb,Gc Class I,Division 1 Class I,Division 1 Class I,Zone 0 Class I,Zone 1 Class I,Zone 0 Class I,Zone 1 Category 1G,2G,2G Class I,Zone 2 Class I,Zone 2	IEC 60079-11 GB 3836.4 UL 913/FM 3610 CSA C22.2 No.157 ISA 60079-11/FM 3610 ISA 60079-11/FM 3610 CSA C22.2 No.60079-11 CSA C22.2 No.60079-11 EN 60079-11 ISA 60079-11/FM 3610 CSA C22.2 No 60079-11	Limit energy of sparks and surface temperature

Protection methods for combustible/ignitable dust atmospheres(including fiber and flyings)

TYPE OF

PROTECTION

CODE

MARKET

APPLICATION

STANDARD

PROTECTION

PRINCIPLE

Pressurization

Type X,Y

Type Z

Ex px(or Ex pxb)

AEx px(or AEx pxb)

Ex px

Ex px (or Ex pxb)

Ex py (or Ex pxb)

AEx py(or AEx pxb)

Ex py

Ex py (or Ex pyb)

Ex pz (or Ex pzb)

AEx pz (or AEx pzb)

Ex pz (or Ex pzb)

IEC

China

IEC

China

IEC

China

Class I,Division 1

Class I,Division 2

EPL Gb

Class I,Zone 1

Category 2G

EPL Gb

Class I,Zone 1

Category 2G

EPL Gc

Class I,Zone 2

Category 3G

FM 3620 (NFPA 496)

NFPA 496

FM 3620 (NFPA 496)

NFPA 496

IEC 60079-2

GB 3836.5

ISA 60079-2

CSA C22.2 No.60079-2

EN 60079-2

IEC 60079-2

GB 3836.5

ISA 60079-2

CSA C22.2 No.60079-2

EN 60079-2

IEC 60079-2

GB 3836.5

ISA 60079-2

CAS C22.2 No.60079-2

EN 60079-2

Restricted
Breathing

Ex nR (or Ex nRc)

AEx nR(or AEx nRc)

Ex nR

Ex nR (or Ex nRc)

IEC

China

EPL Gc

Class I,Zone 2

Category 3G

IEC 60079-15

GB 3836.8

ISA 60079-15

CSA C22.2 No.60079-15

EN60079-15

Keep

flammable

gas out

Encapsulation

Ex ma,mb,mc

AEx ma

Ex ma

Aex mb

Ex mb

AEx mc

Ex mc

IEC

China

EPL Ga,Gb,Gc,

Category 1G,2G,3G

Class I,Zone 0

Class I,Zone 1

Class I,Zone 2

IEC 60079-18

GB 3836.9

EN 60079-18

ISA 60079-18

CSA C22.2 No.60079-18

ISA 60079-18

CSA C22.2 No.60079-18

ISA 60079-18

CSA C22.2 No.60079-18

Oil lmmersion

Ex o (or Ex ob)

AEx o (or AEx b)

Ex o

Ex o (or Ex ob)

IEC

China

EPL Gb

Class I,Zone 1

Category 2G

IEC 60079-6

GB 3836.6

ISA 60079-6

CSA C22.2 No.60079-6

EN60079-6

Powder-Filling

Ex q (or Ex qb)

AEx q (or AEx qb)

Ex q

Ex q (or Ex qb)

IEC

China

EPL Gb

Class I,Zone 1

Category 2G

IEC 60079-5

GB 3836.7

ISA 60079-5

CSA C22.2 No.60079-5

EN 60079-5

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