Explosion protection
Class division
categorization
PTB 08 ATEX 1126 X
Class I Division 1 Group A, B, C, D T6
Permissible surface temperature
Conditions in potentially explosive areas, USA
EU type-examination certificate
Notified body/official testing agency (examples)
TÜV Hannover/Sachsen-Anhalt e.V.
PTB
EXAM
IBExU
INERIS
LCIE
KEMA
SP
LOM
EECS (BASEEFA)
SCS
Country
Germany
Germany
Germany
Germany
France
France
The Netherlands
Sweden
Spain
Great Britain
Great Britain
Year
"Atmosphère
explosible"
guideline of the
European
Community
License
number
Use outside of the
potentially
explosive area
effective in
the Ex area
EN
60079-0
(2006)
IEC
60079-0
(starting from
Edition 5.0)
Use within
the potentially
explosive area IEC
60079-0
(2006)
(starting from
Edition 5.0)
Temporary behavior of
flammable substances in
the Ex area
Categorization
of the potentially
explosive areas
]
[Ex ia IIC
Typical
gas
]
[Ex ia Ga IIC
I
II A
II B
II C
Methane
280
Propane
> 180
Ethylene 60 … 180
Hydrogen
< 60
Ex ia IIC T6 Ga
Gas
Fog
Liquid
Dust
II
Category
1G, (1)G
Equipm. protect.
level (EPL)
Zone 0
Occasional
Zone 1
II
2G, (2)G
Gb
Normally not, only for a
short period
Zone 2
II
3G, (3)G
Gc
Continuous, long
periods, frequent
Zone 20
II
III (IEC 60079-0
1D, (1)D
Da
Occasional
Zone 21
II
III (IEC 60079-0
starting from
Edition 5.0)
2D, (2)D
Db
Ga
III (IEC 60079-0
starting from
Edition 5.0)
3D, (3)D
Dc
Normally not, only for a
short period
Zone 22
II
Methane
Coal dust
Constantly
Coal mining
I
M1
Ma
Methane
Coal dust
Frequent
Coal mining
I
M2
Mb
Note regarding ATEX: The EN 50014 standard has
been replaced by EN 60079-0:
•The existing EU type-examination certificates
based on the old standard are still valid
•It is permitted to combine devices approved with
old and new standards
Class I
1
Dust
Class II
1
2
Class III
1
2
A, B, C, D
A, B, C, D
E, F, G
F, G
–
–
Zone
0 or 1
2
20 or 21
22
20 or 21
22
Temporary behavior
of the flammable substance
in the Ex area
Continuous, long periods,
frequent
Occasional
Ignition temperature of the gas
Group II
Ammonia
630°C
Methane
595°C
Hydrogen
560°C
Propane
470°C
Normally not,
only for short periods
Continuous, long periods,
frequent
Occasional
Ethylene
425°C
Butane
365°C
Acetylene
305°C
T4=135
Cyclohexane
259°C
Normally not,
only for short periods
Constant
Diethyl ether
170°C
T5=100
T6=85
Carbon disulfide
95°C
Occasional
Gas
Normally not,
only for short periods
Methane
T1=450
T2=300
T2A=280
T2B=260
T2C=230
T2D=215
T3=200
T3A=180
T3B=165
T3C=160
T4C=120
ºC
Conditions
Group A: Acetylene, B: Hydrogen, C: Ethylene, D: Propane
Group E: Metal dust, F: Coal dust, G: Grain dust
Mines
susceptible
to firedamp
(coal mining)
Group I
150°C
With deposits of coal dust on
the operating equipment
450°C
Without deposits of coal dust
on the operating equipment
Permissible surface temperature
Ignition temperature of the gas
Group II
Ammonia
630°C
Methane
595°C
Hydrogen
560°C
Propane
470°C
Ethylene
425°C
Butane
365°C
Acetylene
305°C
T4=135
T5=100
T6=85
IEC 60079-0 starting from Edition 5.0
Cyclohexane
259°C
CENELEC
Identification
Typical dusts
Diethyl ether
170°C
Carbon disulfide
95°C
III A
III B
III C
Flammable lint
Non-conducting dust
Conducting dust
Gas
Conditions
Methane Mines
150°C
susceptible
to firedamp 450°C
(coal mining)
T1=450
T2=300
Class zone
categorization
Class I Zone 0 AEx ia IIC T6
T3=200
Conditions in Ex areas
Flammable Temporary behavior of Categorization
substances flammable substances of the potentially
in the Ex area
explosive areas
ºC
Gas
Fog
Liquid
Group I
With deposits of coal dust on
the operating equipment
Without deposits of coal dust
on the operating equipment
Protection type for electrical items
In potentially gas-explosive areas
Protection principle
o
Oil encapsulation
Exclusion of the Ex atmosphere
q
Sand encapsulation
Prevent sparks
EN 60079-5
IEC 60079-5
Category
1G
Use in the defined area
Use outside of the
potentially explosive
area effective up to the
described area
CENELEC
IEC
EN 60079-6
IEC 60079-6
Continuous, long
periods, frequent
Zone 0
Occasional
Zone 1
Normally not, only
for a short period
Zone 2
Gas group / Ignition energy
Ex identification acc. to standard
USA identification
Zone
FM
UL
Zone
Application
1 or 2
FM 3600
UL 60079-6
Class I, zone 1
Transformers, relays, startup controls, switching devices
1 or 2
FM 3600
UL 60079-5
Class I, zone 1
Transformers, relays, capacitors
UL 60079-18
Class I, zone 1
Coils from relays and motors, electronics, solenoid valves,
connection systems
0, 1 or 2
FM 3600
Class I, Div. 1/2
Control and switch cabinets, motors, measuring and analysis devices,
computers
ma, mb
Molded encapsulation
Exclusion of the Ex atmosphere
EN 60079-18
IEC 60079-18
px, py, pz
Pressure encapsulation
Exclusion of the Ex atmosphere
EN 60079-2
IEC 60079-2
1 or 2
FM 3620
NFPA 496
d
Pressure-tight
encapsulation
Propagation prevention
EN 60079-1
IEC 60079-1
1 or 2
FM 3615
UL 60079-1
e
Increased
safety
Prevent sparks
1 or 2
FM 3600
UL 60079-7
ia, ib, ic
Intrinsic safety
Limiting the ignition energy
Intrinsically safe systems
(1)G
Group
Associated
items [  ]
Use outside of the
potentially explosive
area effective in the
Ex area
ANSI/ISA
60079-0
[ AEx ia IIC
]
Items
Use within the
potentially explosive
area
ANSI/ISA
60079-0
AEx ia IIC T6
CENELEC
Identification
Typical
gas
Ignition
energy/μJ
I
II A
II B
II C
Methane
280
Propane
> 180
Ethylene 60 … 180
Hydrogen
< 60
Protection type
Continuous, long
periods, frequent
starting from
Edition 5.0)
Ignition
energy/μJ
Dust group
Ex ia IIC T6
Required labeling of the used items IEC 60079-0
in accordance with CENELEC
(starting from
Edition 5.0)
Device group
Division
2
Gas group / ignition energy
CENELEC
Identification
Conditions in potentially explosive areas ATEX 94/9/EC
Flammable
substances
X
Class
[Ex ia ] IIC T6
EN
60079-0
Items
Observe special operating
conditions
Gas
Fog
Liquid
Fibers
Ex identification acc. to standard (example)
Associated
equipment
[  ]
Identification
–
Ex component with part
U
certificate, cannot be used
alone; CE conformity is certified with the installation of a
complete item
()
c 0344 X II 1 G Ex identification
according to
guideline
94/9/EC (ATEX)
Conditions
Items can be used without
limitation
Flammable
substances
Intrinsically safe fieldbus sys. (FISCO)
Non-sparking fieldbus sys. (FNICO)
nA
nC
nL*
nR
nP
Non-sparking
Spark-forming
items
Power-limited
* varies in North America
and Europe
Vapor-proof
housing
Simplified
pressure encapsulation
op is, op pr, op sh Optical radiation
Comparable with Ex e
Comparable with Ex d
Comparable with Ex i
EN 60079-7
IEC 60079-7
EN 60079-11
IEC 60079-11
EN 60079-25
IEC 60079-25
EN 60079-27
IEC 60079-27
EN 60079-15
IEC 60079-15
EN 60079-15
IEC 60079-15
EN 60079-15
IEC 60079-15
EN 60079-15
IEC 60079-15
EN 60079-15
Comparable with Ex p
IEC 60079-15
Limit, avoid, etc. energy transmission EN 60079-28
from optical radiation
IEC 60079-28
Protection by housing
0, 1 or 2
FM 3610
UL 60079-11
Switch, command and signaling devices, controls, motors,
power electronics
Class I, zone 1
Branch and connection boxes, housings, motors, terminal blocks
Class I, Div. 1
Measurement, control and regulation technology, sensors, actuators,
instrumentation
0, 1 or 2
Intrinsic safety, simple electrical equipment
Passive components
Energy storing devices
Energy sources*
PT 100
Capacitor
Thermocouple
Switch
Coil
Photo cells
* Requirement
U ≤ 1.5 V
I ≤ 100 mA
P ≤ 25 mW
Distributor boxes
1
2
2
FM 3600
UL 60079-15
Class I, zone 2
Zone 2 only
2
FM 3600
UL 60079-15
Class I, zone 2
Zone 2 only
2
FM 3600
UL 60079-15
Class I, zone 2
Zone 2 only
2
FM 3600
UL 60079-15
Class I, zone 2
Zone 2 only
2
FM 3600
UL 60079-15
Class I, zone 2
Zone 2 only
1 or 2
Optoelectronic devices
Protection type for electrical items
In areas with flammable dust
Protection principle
CENELEC
IEC
Zone
FM
tD
Protection by housing
Exclusion of the Ex atmosphere
EN 61241-1
21 or 22
FM 1203
iaD, ibD
Intrinsic safety
Energy limitation of sparks and
temperatures
EN 61241-11
20, 21 or 22
FM 3100
pD
Pressure encapsulation
Exclusion of the Ex atmosphere
EN 61241-4
21 or 22
maD, mbD
Molded encapsulation
Exclusion of the Ex atmosphere
EN 61241-18
20, 21 or 22
UL
Zone
Class II, Div. 1
UL 913
Class II, Div. 1
NFPA 496
Class II, Div.1/2
Application
Switch, command and signaling devices, lamps, branch
and connection boxes, housings
Measurement, control and regulation technology, sensors, actuators,
instrumentation
Control and switch cabinets, motors, measuring and analysis devices
Coils and relays of the motors, electronics and connection systems
Resistances
Values are to be exactly defined and to be taken into account
when determining the overall system safety.
More information in the brochure
"Basics – Explosion protection"
Please request at
www.phoenixcontact.com
© Phoenix Contact 2008
ID no.
0032
0102
0158
0637
0080
0081
0344
0402
0163
0600
0518
Additional conditions
MNR 5143454/10.04.2008-01
ATEX/IEC
UL/FM