Protection Concepts for Potentially Explosive Gas/Vapour Atmospheres
Products
Hazardous Locations Marking Example
Markings for North America
EJB
EJB A
HDL106
Option A: (Zone System)
Ex emb IIC T4 (Canada)
Class I Zone 1 AEx emb IIC T4 (U.S.)
Flammable Gas or Vapour
Area Classification
Conformity to U.S. Requirements
Explosion Protected
Protection Concept
Gas Group
Surface Temperature
Class I Zone 1
A
Ex
emb
Option B: (Division System)
Flammable Gas or Vapour
Area Classification
EJBX
Gas Group
IIC
II
GUB - V
Apparatus Grouping
Conformity to CENELEC Standard
Explosion Protected
Protection Concept
Gas Group
CCA-E
emb
CCAI
emb
IIC
Class III
Temperature Code & Temperature Class
HDL106
450
T1
T1
280
T2A
-
300
T2
260
Type
-
T3B
160
-
T3C
135
T4
120
T4
-
T4A
100
T5
85
Restricted Breathing
T5
T6
T6
Example of Hazardous
Area Zones
This diagram shows how
hazardous area zones
may occur in typical
circumstances.
Equipment Category and Level of Presence or Duration of Flammable substances
Protection
Explosive Atmosphere
Presence
Methane, Coal Dust
-
1 - Very high level of protection
Continuous Presence
G - Gas, Vapours
D - Dust
Zone 0 (Gas/Vapour) Zone
20 (Dust)
Risk of Presence
2 – High level of protection
Likely to Occur
3 – Normal level of protection
Unlikely to Occur
Application
General Purpose
3, 3R, 3S
Indoor/Outdoor
Protection against rain, snow
5
6
Indoor/Outdoor
Indoor
Indoor/Outdoor
Indoor/Outdoor
Indoor
Indoor
Zone 1 (Gas/Vapour) Zone
21 (Dust)
Zone 2 (Gas/Vapour) Zone
22 (Dust)
General Requirements
Standard
Class I, Division 1 & 2
Class I, Zone 1 & 2
Class I, Zone 1 & 2
Category 1G, 2G & 3G
EPL Ga, Gb & Gc
FM 3600
ISA 60079-0
C22.2 No. 60079-0
EN 60079-0
IEC 60079-0
US
CA
Class I, Division 2
Class I, Division 2
ISA 12.12.01/FM 3611
C22.2 No. 213
US
CA
Class I, Division 1
Class I, Division 1
AEx d
Ex d
Ex d (or Ex db)
Ex d (or Ex db)
US
CA
EU
IEC
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
ISA 60079-1
C22.2 No. 60079-1
EN 60079-1
IEC 60079-1
AE x nC
Ex nC
Ex nC (or Ex nCc)
Ex nC (or Ex nCc)
US
CA
EU
IEC
Class I, Zone 2
Class I, Zone 2
Category 3G
EPL Gc
ISA 60079-15
CSA E60079-15
EN 60079-15
IEC 60079-15
(NI)
(NI)
AEx nA
Ex nA
Ex nA (or Ex nAc)
Ex nA (or Ex nAc)
(XP)
(XP)
AEx q
Ex q
Ex q (or Ex qb)
Ex q (or Ex qb)
(IS)
(IS)
AEx ia
AEx ib
Ex ia
Ex ib
Ex ia
Ex ib
Ex ic
Ex ia
Ex ib
Ex ic
AEx nC
Ex nL
Ex nL (or Ex nLc)
Ex nL (or Ex nLc)
Type X
Type X
Type Y
Type Y
Type Z
Type Z
AEx px
Ex px
Ex px (or Ex pxb)
Ex px (or Ex pxb)
AEx py
Ex py
Ex py (or Ex pyb)
Ex py (or Ex pyb)
AEx pz
Ex pz
Ex pz (or Ex pzb)
Ex pz (or Ex pzb)
AEx nR
Ex nR
Ex nR (or Ex nRc)
Ex nR (or Ex nRc)
AEx ma
Ex ma
Ex ma
Ex m
AEx mb
Ex mb
Ex mb
AEx o
Ex o
Ex o (or Ex ob)
Ex o (or Ex ob)
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Class I, Zone 2
Category 3G
EPL Gc
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
US
CA
US
US
CA
CA
EU
EU
EU
IEC
IEC
IEC
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
Category 2G
Category 3G
EPL Ga
EPL Gb
EPL Gc
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
Class I, Zone 1
Category 2G
EPL Gb
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
Class I, Zone 2
Class I, Zone 2
Category 3G
EPL Gc
US
EU
IEC
CA
US
EU
IEC
Class I, Zone 0
Category 1G
EPL Ga
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
US
CA
EU
IEC
US
CA
EU
IEC
US
CA
EU
IEC
Class I, Zone 2
Class I, Zone 2
Category 3G
EPL Gc
Class I, Zone 2
Class I, Zone 2
Category 3G
EPL Gc
Class I, Zone 1
Class I, Zone 1
Category 2G
EPL Gb
ISA 60079-7
CSA E60079-7
EN 60079-7
IEC 60079-7
Protection
Principle
No arc, sparks or
hot surfaces
ISA 60079-15
CSA E60079-15
EN 60079-15
IEC 60079-15
UL120 /FM3615
C22.2 No. 30
ISA 60079-5
CSA E60079-5
EN 60079-5
IEC 60079-5
UL 913/FM 3610
C22.2 No. 157
ISA 60079-11/FM 3610
ISA 60079-11/FM 3610
CSA E60079-11
CSA E60079-11
EN E60079-11
EN E60079-11
EN E60079-11
IEC E60079-11
IEC E60079-11
IEC E60079-11
Contain the
explosion and
extinguish the
flame
Limit energy of
sparks and
surface
temperature
ISA 60079-15
CSA E60079-15
EN 60079-15
IEC 60079-15
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
ISA 60079-2
CSA E60079-2
EN 60079-2
IEC 60079-2
ISA 60079-2
CSA E60079-2
EN 60079-2
IEC 60079-2
ISA 60079-2
CSA E60079-2
EN 60079-2
IEC 60079-2
Keep flammable
gas out
ISA 60079-15
CSA E60079-15
EN 60079-15
IEC 60079-15
ISA 60079-18
EN 60079-18
IEC 60079-18
CSA E60079-18
ISA 60079-18
EN 60079-18
IEC 60079-18
ISA 60079-6
CSA E60079-6
EN 60079-6
IEC 60079-6
Protection against temporary submersion
Protection against circulating dust, fibres, flyings
*Refer to enclosure standard for detailed definitions – CSA C22.2 No. 94, UL 50
Note 1: For associated intrinsically safe apparatus suitable for installation in
a hazardous location, the symbol for the type of protection “iaD” or “ibD”
are enclosed within square brackets, e.g. Ex d [iaD] IIC T4.
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 “iaD” or “ibD” are enclosed within the same
square brackets, e.g. [Ex iaD] IIC; in this case, a temperature class is not
included.
This certification guide is an introduction to the classification of hazardous
area zones and must be used for basic information only. More detailed
information can be found at some of the official sites listed below:
www.siracertification.com, www.iecex.com, www.iecee.org
Continuous Hazard
1
Intermittent Hazard2
Hazard Under
Abnormal Conditions3
Division 1 or
Zone 0 / Zone 20
Zone 0 / Zone 20
Division 2 or
Zone 2 / Zone 22
Zone 2 / Zone 22
Division 1 or
Zone 1 / Zone 21
A-Belco Hazardous Area, Jubilee Industrial Estate, Ashington, Northumberland, NE63 8UG United Kingdom
F: +44 (0) 1670 858 638
Class II, Division 1 & 2
Class III, Division 1 & 2
Zone 20, 21 & 22
Category 1D, 2D & 3D
Zone 20, 21 & 22
FM 3600
FM 3600
ISA 61241-0
EN 61241-0 or
EN 60079-0
IEC 61241-0 or
IEC
UL 1203/FM 3610
CSA C22.2 No. 25
Dust-Protected
(NI)
Protection by Enclosure
AEx ta
AEx tb
AEx tc
DIP A21
DIP A22
Ex ta
Ex ta
Ex tb
Ex tb
Ex tc
Ex tc
US
CA
Class II, Division 2
Class II, Division 2
ISA 12.12.01/FM 3611
CSA C22.2 No. 25
US
CA
Class III, Division 1 & 2
Class III, Division 1 & 2
ISA 12.12.01/FM 3611
CSA C22.1
Pressurisation
Zone 1 / Zone 21
1. A place in which an explosive atmosphere is continually present
2. A place in which an explosive atmosphere is likely to occur in normal operation
occasionally
3. A place in which an explosive atmosphere is not likely to occur in
normal operation, but if it does, only occurs for short period
a member of the
T: +44 (0) 1670 814 877
CENELEC
and IEC
US
US
US
EU
Class II, Divison 1
Class II, Divison 1
Encapsulation
NEC and CEC
(North America)
Standard
US
CA
Area Classification – Division v Zone
Type of Area
Application
(DIP)
Fibre & Flying Protection
Protection against prolonged submersion
Ex
Ex
Market
Dust-Ignition proof
Protection against rain, snow, hose directed water
Protection against angled dripping water, dust, fibres, flyings
Code
Ex
Protection against angled dripping water
Protection against circulating dust, fibres, flyings, seepage
www.a-belco.co.uk/Hazardous
Application
US
US
CA
EU
IEC
Type of
Protection
-
Abbreviated Definition*
Indoor
4, 4X
Correlation with
Hazardous Areas
M1 – Very high level of protection
Indoor
Oil Immersion
Market
Protection Concepts for Combustible/Ignitable Dust Atmospheres
1
13
hazardous@a-belco.co.uk
T3
T3A
165
T4
-
T3
180
Pressurised
-
T2D
200
Limited Energy
-
T2C
215
Intrinsic Safety
T2
T2B
230
Temperature Class
US (NEC)
Canada (CEC)
IEC, CENELEC
US (NEC)
Canada (CEC)
ATEX Directive 94/9/EC
12,12K
P...
Cotton
Maximum Surface
Temperature (oC)
M2 – High level of protection
II - Surface
6P
EFSCO
Class II, Group G
Grain
Enclosed Break
IEC, CENLEC do
not subdivide by
material types
Class II, Group F
ATEX Directive 94/9/EC
2
SPY
Class II, Group E
Ex
Environment
I – Mines
PY
Group I*
Group IIA
Powder-Filled
Encapsulation
Equipment Group
CTB & CSTB
Gaseous Mines*
Class I, Group D
Coal
T4
Protection Concept
Gas Group
Group IIB
Magnesium
.2578781 /00
Explosion Protected
Class I, Group C
Methane
IECEx Scheme Identifier
IECEx Certification Body (ExCB) – e.g. is CSA International
Year Issued
Identification Number
Certificate of Conformity Revision Number
13
Ethylene
Group IIC
Class I, Group B
Propane
Temperature Class
IECEx Certificate of Conformity (IECEx Scheme)
IECEx CSA
Class I, Group A
*Not within scope of NEC or CEC
Class I – Gas/Vapour, Class II – Dust, Class III – Fibres/Flyings
Markings for Global IECEx Scheme
Ex
CCA-EH
IIC
Acetylene
Hydrogen
GD
US (NEC)
Canada (CEC)
IEC, CENELEC
US (NEC)
Canada (CEC)
TypicalGas/Dust/
Fibres/Flyings
HDL106
Plus features of protection required by CENELEC standards as
shown below (e.g. Ex ia IIC T4)
Ex
CCA-C
2
AEx e
Ex e
Ex e (or Ex eb)
Ex e (or Ex eb)
Flameproof
1st numeral & 2nd numeral
combined to identify level of ingress
protection, e.g. dust tight, protected
from high power water jets/heavy seas
CE Marking Symbol
ID No. of Notified Body of the QA System (e.g. below for Sira)
EU Explosive Atmospheres Symbol
Surface (non-mining) Equipment
Equipment Category
Type of Flammable Substance
0518
Increased Safety
Explosion proof
Class I Division 1 Groups A,B,C,D T4
ATEX Directive (94/9/EC)
For equipment used in Potentially Explosive Atmospheres
AEx
Ex
Ex
Ex
Non-Sparking
Temperature Code
Code
General Requirements
for Hazardous Locations
Non-Incendive
T4
Markings for European Union
GUB
Ingress Protection (IP) Codes
Type of
Protection
Intrinsic Safety
(DIP)
US
US
US
CA
CA
EU
IEC
EU
IEC
EU
IEC
AEx maD
Ex maD
Ex maD
AEx mbD
Ex mbD
Ex mbD
US
EU
IEC
US
EU
IEC
(IS)
(IS)
AEx iaD
Ex iaD
Ex iaD
AEx ibD
Ex ibD
Ex ibD
(IS)
(IS)
US
CA
US
EU
IEC
US
EU
IEC
US
CA
(PX)
(PX)
(PY)
(PY)
(PZ)
(PZ)
AEx pD
Ex pD
Ex pD
US
CA
US
CA
US
CA
US
EU
IEC
Zone 20
Zone 21
Zone 22
Class II, Division 1
Class II, Division 2
Category 1D
EPL Da
Category 2D
EPL Db
Category 3D
EPL Dc
ISA 60079-31
ISA 60079-31
ISA 60079-31
CSA E61241-1-1
CSA E61241-1-1
EN 60079-31
EN 60079-31
EN 60079-31
EN 60079-31
EN 60079-31
EN 60079-31
Zone 20
Category 1D
EPL Da
Class II, Zone 21
Category 2D
EPL Db
ISA 61241-18
EN 61241-18
IEC 61241-18
ISA 61241-18
EN 61241-18
IEC 61241-18
Class II, Division 1
Class II, Division 1
Zone 20
Category 1D
EPL Da
Zone 21
Category 2D
EPL Db
Class III, Division 1
Class III, Division 1
UL 913/FM 3610
CSA C22.2 No. 157
ISA 61241-11
EN 61241-11
IEC 61241-11
ISA 61241-11
EN 61241-11
IEC 61241-11
FM 3610
CSA C22.2 No.157
Class II, Division 1
Class II, Division 1
Class II, Division 1
Class II, Division 1
Class II, Division 2
Class II, Division 2
Zone 21
Category 2D
EPL Db
Protection
Principle
Keep
combustible dust
out
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
FM 3620 (NFPA 496)
NFPA 496
ISA 61241-2
EN 61241-4
IEC 61241-4
Limit energy of
sparks and
surface
temperature