Guide to Hazardous Locations - FM Approvals
Guide to Hazardous Locations
Explosive Gas Atmospheres
Ex Marking
US (NEC 500) and CA (CE Code Annex J18)
?
Type of Protection
(optional except for I.S.)
Protection
Concepts
Type of Protection
Code
Permitted Division
(optional except for Division 2)
Increased Safety
Temperature Class
(T5 and T6 optional)
Permitted Group
Ambient temperature ranges other than standard (-25¡ãC ¡Ü Ta ¡Ü +40¡ãC) must be marked.
US (NEC? 505)
Non-Incendive
Explosionproof
American
National
Standard
Permitted Class
Type of
(optional)
Protection
Flameproof
Equipment Protection Level
(optional)
Class I, Zone 1, AEx db [ia Ga] IIC T5 Gb
Explosion-Protected
Permitted Zone
Gas Group
I.S. Output
Temperature Class
Ambient temperature ranges other than standard (-20¡ãC ¡Ü Ta ¡Ü +40¡ãC) must be marked.
CA (CE Code Section 18), EU and IEC
Type of Protection
Equipment
Protection
Level
Powder-Filled
Temperature
Class
NI Component
Ex db [ia Ga] IIC T5 Gb
Gas Group
Explosion-Protected
I.S. Output
Intrinsic Safety
Equipment
Protection
Level
Ambient temperature ranges other than standard (-20¡ãC < Ta < +40¡ãC) must be marked.
Additional EU marking per 2014/34/EU (ATEX)
CE Conformity Marking
Explosion Protection Marking
Type of Exposive Atmosphere:
G (for gas, vapor, mist)
II 2(1) G
2809
Category for I.S. Output
Category
Equipment Group 1 (for Zone 0)
I (for mines) 2 (for Zone 1)
II (for other than mines) 3 (for Zone 2)
Identification Number of Notified Body
Involved in Production Control Stage
Pressurized
Typical Zone
IEC
EU (ATEX)
EPL Group Category Group of Application
Mines, ¡°very high¡±
Ma
level of protection
Mines, ¡°high¡±
level of protection
Gas atmospheres,
¡°very high¡± level
of protection
Gas atmospheres,
¡°high¡± level of
protection
Gas atmospheres,
¡°enhanced¡± level
of protection
M1
I
I
Mb
M2
Ga
1G
Gb
II
Gc
2G
N/A
0
1
II
3G
2
Restricted Breathing
Encapsulation
FM Approvals is your global
conformity assessment solution
Market Recognized product certification marks
Canada
C
C
C
US
US
Sealed Device
EU (ATEX)
FM Approvals can also issue IECEx Test Reports, Quality Assessment Reports and
Certificates of Conformity.
FM Approvals
1151 Boston-Providence Turnpike, Norwood, MA, US 02062-9102
Phone: +1 (1)781 255 4851 Fax: +1 (1)781 762 9375
E-mail: information@
In Europe, FM Approvals Europe Limited
One Georges Quay Plaza, Dublin 2, D02 E440, Ireland
P0296 ? 2013 FM Approvals
(Rev. 05/2020) All rights reserved.
Class I, Division 1 & 2
Class I, Division 1 & 2
Class I, Zone 0, 1 & 2
Zone 0, 1, & 2
Category 1G, 2G, & 3G
EPL Ga, Gb, Gc
Class I, Zone 1
Zone 1
EPL Gb
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Division 2
Class I, Division 2
Class I, Division 1
Class I, Division 1
Class I, Zone 0
Zone 0
Category 1G
EPL Ga
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Division 1
(I.S.)
CA
Class I, Division 1
AEx ia
Ex ia
Ex ia
Ex ia
AEx ib
Ex ib
Ex ib
Ex ib
AEx ic
Ex ic
Ex ic
Ex ic
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
Class I, Zone 0
Zone 0
Category 1G
EPL Ga
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
FM 3600
CSA C22.2 No. 0
ANSI/UL 60079-0
CSA C22.2 No. 60079-0
EN IEC 60079-0
IEC 60079-0
ANSI/UL 60079-7
CSA C22.2 No. 60079-7
EN IEC 60079-7
IEC 60079-7
ANSI/UL 60079-7
CSA C22.2 No. 60079-7
EN IEC 60079-7
IEC 60079-7
FM 3611
CSA C22.2 No. 213
FM 3615
CSA C22.2 No. 30
ANSI/UL 60079-1
CSA C22.2 No. 60079-1
EN 60079-1
IEC 60079-1
ANSI/UL 60079-1
CSA C22.2 No. 60079-1
EN 60079-1
IEC 60079-1
ANSI/UL 60079-1
CSA C22.2 No. 60079-1
EN 60079-1
IEC 60079-1
ANSI/UL 60079-5
CSA C22.2 No. 60079-5
EN 60079-5
IEC 60079-5
ANSI/UL 60079-15
CSA C22.2 No. 60079-15
EN IEC 60079-15
IEC 60079-15
FM 3610
C22.2 No. 60079-11 or
CSA C22.2 No. 157
ANSI/UL 60079-11
CSA C22.2 No. 60079-11
EN 60079-11
IEC 60079-11
ANSI/UL 60079-11
CSA C22.2 No. 60079-11
EN 60079-11
IEC 60079-11
ANSI/UL 60079-11
CSA C22.2 No. 60079-11
EN 60079-11
IEC 60079-11
Flammable Material Flammable Material
Present Continuously Present Intermittently Present Abnormally
IEC / EU
US (NEC? 505)
US (NEC? 500)
CA (CE Code Section 18)
CA (CE Code Annex J18)
No arcs,
sparks or
hot surfaces
Contain
the explosion
and extinguish
the flame
Type X
Type X
Type Y
Type Y
Type Z
Type Z
AEx pxb (or AEx px)
Ex pxb (or Ex px)
Ex pxb
Ex pxb
AEx pyb (or AEx py)
Ex pyb (or Ex py)
Ex pyb
Ex pyb
AEx pzc (or AEx pz)
Ex pzc (or Ex pz)
Ex pzc
Ex pzc
US
CA
US
CA
US
CA
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
Class I, Division 1
Class I, Division 1
Class I, Division 1
Class I, Division 1
Class I, Division 2
Class I, Division 2
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Liquid Immersion
AEx nR
Ex nR
Ex nR
Ex nR
AEx ma
Ex ma
Ex ma
Ex ma
AEx mb (or AEx m)
Ex mb
Ex mb
Ex mb
AEx mc
Ex mc
Ex mc
Ex mc
AEx nC
Ex nC
Ex nC
Ex nC
AEx ob (or AEx o)
Ex ob
Ex ob
Ex ob
AEx oc
Ex oc
Ex oc
Ex oc
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
IEC
EU
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EN
IEC
Note 5: For the US, the marking of ¡°Class I¡± for Zones 0, 1, or 2 is optional.
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Zone 0
Zone 0
Category 1G
EPL Ga
Class I, Zone 1
Zone 1
EPL Gb
Category 2G
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Class I, Zone 1
Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Zone 2
Category 3G
EPL Gc
Zone 1
Zone 2
Zone 0
Zone 1
Zone 2
Division 2
Zone 1
Zone 2
Division 2
Division 1
Zone 0
Division 1
IEC classification per IEC 60079-10-1
EU classification per EN 60079-10-1
US classification per ANSI/NFPA 70 National Electrical Code? (NEC?) Article 500 or Article 505
CA classification per CSA C22.1 Canadian Electrical Code (CE Code) Section 18 or Annex J
Equipment Grouping
Typical gas
Acetylene
Hydrogen
Ethylene
Propane
Methane
US (NEC? 505)
CA (CE Code Section 18)
EU
IEC
US (NEC? 500)
CA (CE Code Annex J18)
Group IIC
Class I/Group A
(Group IIB + H2)
Class I/Group B
Group IIB
Class I/Group C
Group IIA
Class I/Group D
Group I*
Mining*
*Not within scope of NEC . Under jurisdiction of MSHA. Not within scope of CE Code.
?
Marking
450¡ãC
300¡ãC
280¡ãC
260¡ãC
230¡ãC
215¡ãC
200¡ãC
180¡ãC
165¡ãC
160¡ãC
135¡ãC
120¡ãC
100¡ãC
85¡ãC
Limit
energy of
sparks and
surface
temperature
US (NEC? 505)
CA (CE Code) Section 18)
EU
IEC
US (NEC? 500)
CA (CE Code Annex J18)
T1
T1
T2
T2
T2A
T2B
T2C
T2D
T3
T3
T3A
T3B
T3C
T4
T4
T4A
T5
T5
T6
T6
Ingress Protection (IP) Codes
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
ANSI/UL 60079-2
CSA C22.2 No. 60079-2
EN 60079-2
IEC 60079-2
ANSI/UL 60079-2
CSA C22.2 No. 60079-2
EN 60079-2
IEC 60079-2
ANSI/UL 60079-2
CSA C22.2 No. 60079-2
EN 60079-2
IEC 60079-2
ANSI/UL 60079-15
CSA C22.2 No. 60079-15
EN IEC 60079-15
IEC 60079-15
ANSI/UL 60079-18
CSA C22.2 No. 60079-18
EN 60079-18
IEC 60079-18
ANSI/UL 60079-18
CSA C22.2 No. 60079-18
IEC 60079-18
EN 60079-18
ANSI/UL 60079-18
CSA C22.2 No. 60079-18
EN 60079-18
IEC 60079-18
ANSI/UL 60079-15
CSA C22.2 No. 60079-15
EN IEC 60079-15
IEC 60079-15
ANSI/UL 60079-6
CSA C22.2 No. 60079-6
EN 60079-6
IEC 60079-6
ANSI/UL No. 60079-6
CSA No. 60079-6
EN 60079-6
IEC 60079-6
Zone 0
Temperature Class
First Characteristic Numeral
Second Characteristic Numeral
Protection against solid bodies
Protection against liquid
0
1
2
3
4
5
6
7
8
9
Note 3: For associated equipment used with pressurized equipment, such as a pressurization control system installed within the hazardous
location, the symbol for the Type of Protection is enclosed within brackets (e.g., Ex db [pxb] IIC T4 Gb).
Note 4: The associated equipment not suitable for installation in a hazardous location, both the symbol ¡°Ex¡± or ¡°AEx¡± and the symbol ¡°pxb¡±
are enclosed within the same square brackets (e.g., [AEx pxb Gb]). In this case, a temperature class is not included.
Level of protection assigned to equipment based on its likelihood of becoming a source
of ignition
US
AEx
Ex
Ex
Ex
AEx eb (or AEx e)
Ex eb (or Ex e)
Ex eb
Ex eb
AEx ec
Ex ec
Ex ec
Ex ec
(NI)
(NI)
(XP)
(XP)
AEx da
Ex da
Ex da
Ex da
AEx db (or AEx d)
Ex db (or Ex d)
Ex db
Ex db
AEx dc
Ex dc
Ex dc
Ex dc
AEx qb (or AEx q)
Ex qb (or Ex q)
Ex qb
Ex qb
AEx nC
Ex nC
Ex nC
Ex nC
(I.S.)
US
CA
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
US
CA
US
CA
EU
IEC
US
CA
EN
IEC
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
US
Protection Principle
Note 1: For associated intrinsically safe apparatus suitable for installation in a hazardous location, the symbols for the type of protection
¡°ia¡± or ¡°ib¡± are enclosed within square brackets (e.g., Class I, Zone 1 AEx db [ia Ga] IIC T4 Gb).
Note 2: For associated intrinsically safe apparatus not suitable for installation in a hazardous location, both the symbol ¡°Ex¡± or ¡°AEx¡± and
the symbol for the type of protection ¡°ia¡±, ¡°ib¡± or ¡°ic¡± are enclosed within the same square brackets (e.g., [AEx ia Ga]); in this case, a temperature
class is not included.
EPL/Category
Definition
Standard
General Requirements
Permitted Class
Explosionproof for Class I,
Division 1, Groups A, B, C, D T5
Market Application
Area Classification
Flammable Material
Keep
flammable
gas out
No protection
No protection
Objects greater than 50mm
Vertical (90?) dripping water
Objects greater than 12mm
75? to 90? dripping water
Objects greater than 2.5mm
Sprayed water
Objects greater than 1mm
Splashed water
Dust-protected
Water jets
Dust-tight
Heavy seas
Temporary immersion
Continuous immersion
High pressure/temperature water jet
Approximate US enclosure type equivalent to IPXX
Type
IP
Type
IP
Type
1 10
3S 54
6 and 6P 67
2 11
4 and 4X 55
12 and 12K 52
3 54
5 52
13 54
3R 14
Acronyms
ATEX
CA
CE Code
EPL
EU
IEC
I.S.
MSHA
NFPA
NEC?
US
Atmosph¨¨re explosible
Canada
Canadian Electrical Code (CSA C22.1)
Equipment Protection Level
European Union
International Electrotechnical Commission
Intrinsic Safety
Mine Safety and Health Administration
National Fire Protection Association
National Electrical Code? (NFPA 70)
United States of America
IP
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