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ATEX Certification Definitions
Zoning Definitions
Categories
Zones
Gas
ATEX
Cat.
Definitions
Dust
Non-electrical Equipment
Typical Zone
Suitability
EN 60079-10 EN 61241-10
0
1
2
20
A place in which an explosive
atmosphere is continually present
1G
1D
Equip. suitable for zone 0
Equip. suitable for zone 20
21
A place in which an explosive
atmosphere is likely to occur in normal
operation occasionally
2G
2D
Equip. suitable for zone 1
Equip. suitable for zone 21
A place in which an explosive atmosphere
is not likely to occur in normal operation,
but if it does only occurs for short periods
3G
3D
22
IP Code
Dusts
1st Numerical
2nd Numerical
Protection against Solid Bodies
Protection against Liquid
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8
No protection
Objects > 50mm
Objects > 12mm
Objects > 2.5mm
Objects > 1mm
Dust-protected
Dust-tight
US Enclosure Ratings
NEMA, UL
& CSA
type rating
Equip. suitable for zone 2
Equip. suitable for zone 22
Approximate
IEC/IP
classification
1
2
3
3R
4
IP20
IP22
IP55
IP24
IP66
4X
IP66
6
IP67
Zone
No protection
Vertically dripping water
Drops of liquid (75° to 90°)
Sprayed water
Splashed water
Water jets
Heavy seas
Effects of immersion
Indefinite immersion
20
Requires 1D equipment
IP6X
21
Requires 1D or 2D equipment
IP6X
22
Requires 3D, 2D or 1D equipment
IP5X*
0.14
*
0.2
0.35
0.5
0.7
1
5
10
Cable Gland Selection
No
Is equipment
Ex d concept?
Yes
Yes
c
EN 13463-6
Control of ignition sources
b
EC-Type Examination
B
III
EN 13463-7
Pressurisation
p
Internal Control of Production
A
VIII
EN 13463-8
Liquid immersion
k
Unit Verification
G
IX
O
Production Quality Assurance
D
IV
Y
Product Quality Assurance
E
VII
Product Verification
F
V
Conformity to Type
C
VI
Internal Control of Production
A
VIII
Unit Verification
G
IX
KEY
✔ = mandatory unless Unit Verification is used
O = optional as an alternative to other modules
Y = one of two production phase modules for
the equipment category to be chosen by the
manufacturer
*refer to note 1
Ex e concept
Note 1: Non certified cable glands
may be used provided that they
maintain the minimum IP rating on
the certified equipment of IP54 for
outdoors and IP20 for indoor
equipment.
DUST
Type of Protection
–
EN 60079-0
General Requirements
ATEX
Code
Standard
–
EN 61241-0:2006
Ex ia & ib
EN 60079-11
Protection by Enclosures
tD
EN 61241-1:2004
Increased Safety
Ex e
EN 60079-7
Protection
pD
EN 61241-4:2006
Flameproof
Ex d
EN 60079-1
Intrinsic Safety
iD
EN 61241-11:2006
Pressurisation
Ex p
EN 60079-2
Powder Filling
Ex q
EN 60079-5
Encapsulation
Ex ma & mb EN 60079-18
Oil Immersion
Ex o
EN 60079-6
Type n
Ex n
EN 60079-15
Temperature
T-Class Max surface
temp in °C
20
T1
450
T2
300
T3
200
T4
135
T5
100
T6
85
No
Encapsulation
mD
Type n EN60079-15
Enclosed break device
Non-incendive component
Hermetically sealed device
Sealed device
Encapsulated device
Energy limited apparatus & circuits
Restricted breathing enclosure
Non sparking
Does the
hazardous
gas require IIC
apparatus?
Yes
Ex e concept
Gland type
Use a barrier
gland
Yes
Is the
volume of
enclosure
greater than
2 dm3?
O O
✔*4 ✔
O
O O
O O
Y
Y
Y
Y
Y
Y
Y
Y
Y
✔
O
O O
✔
O
O O
✔
O O
II
Electrical equipment intended for use in places with an
explosive gas atmosphere other than mines susceptible to
firedamp
III
Electrical equipment intended for use in places with an
explosive dust atmosphere other than mines susceptible to
firedamp*
Gas Groups
EN 61241-18:2004
nC
nC
nC
nC
nC
nL
nR
nA
Brass
Does this
enclosure
contain an
internal source
of ignition?
Propane
IIIA
Combustible Flyings
IIB
Ethylene
IIIB
Non-conductive Dust
IIC
Hydrogen/Acetylene
IIIC
Conductive Dust
*Taken from the new IEC60079-0 2007
Simple Apparatus
Passive components
EN1127-1
Explosive atmospheres - Explosion prevention and protection.
Part 1, Basic concepts & methodology for surface industry
EN1127-2
Explosive atmospheres - Explosion prevention and protection.
Part 2, Basic concepts & methodology for mining
EN60079-10
Classification of hazardous areas
EN60079-14
Electrical installations in hazardous areas (other than mines)
EN60079-17
Electrical installations inspection and maintenance
EN60079-19
Equipment repair, overhaul and reclamation
EN60079-28
Protection of equipment and transmission systems using
optical radiation
Marking for
Dust or Flyings
and Fibres
Hazards
*refer to note 2
II 2 G Ex d IIC T4
XXXX
EC Mark
Gas
Type of
Protection
Explosion
Protection
Equipment
Category
Sources of generated energy not
more than *1.5V, 100mA & 25mW
NOT
piezoelectric crystal
protected components
voltage or current enhancement
Temperature
Gas Group*
Class
A, B or C
(T1-T6)
* Note: North America still
uses 1.2V and 20 microjoules
*If omitted suitable
for all gas groups
III 2 D Ex tD A21 IP66 T80°C
XXXX
Complies with
European
Directive
Equipment
Group
EC Mark
Equipment
Group
Notified Body
Number
Dust
Equipment
Category
Type of
Protection
Ingress protection
and max. surface
temperature
Explosion
Protection
The threshold power of radio frequency (10 kHz to 300 GHz) for continuous transmissions and for pulsed
transmissions whose pulse durations exceed the thermal initiation time shall not exceed the values shown in Table 4.
Programmable or software control intended for setting by the user shall not be permitted.
For pulsed radar and other transmissions where the pulses are short compared with the thermal initiation time, the
threshold energy values Zth shall not exceed those given in Table 5.
Table 4 from IEC 60079-0
Radio Frequency Power Thresholds
No
No
Well defined sources of
stored energy considered
in safety analysis
Radio Frequency Sources
Use certified
cable glands
No
Is the area of
installation of
Zone 1?
Dust Groups*
IIA
Assessment of inadvertent ignition of flammable atmospheres
by radio frequency radiation (guide)
Notified Body
Number
*refer to note 3
No
✔*4
✔
Electrical equipment intended for use in mines susceptible
to firedamp
BS6656
Ex n* or N
concept
Plastic
Yes
✔
Other Useful Standards
Marking for
Gas Hazards
Use non-certified
cable glands
Yes
✔
5V in
Zone 2
No
Note 2: Non certified cable glands
may be used provided they meet
the requirements of EN60079-0 and
EN60079-7 or EN60079-15.
Note 3: Internal sources of ignition
include sparks or equipment
temperatures occurring in normal
operation which can cause ignition.
An enclosure containing terminals
only or an indirect entry enclosure is
considered not to constitute an
internal source of ignition.
✔
I
Yes
Refer to Ex d
cable selector
chart
✔
Production Phase
* Notes:
1 “Global Approach” OJEC No.L220, 1993
2 ATEX Directive 94/9/EC
3 Suffix (E) refers to electrical equipment and
internal combustion engines
Suffix (N) refers to non-electrical equipment
4 Technical Files to be deposited with a notified
body
Complies with
European
Directive
Use non-certified
cable glands
Design Phase
Conformity Assessment ‘Quality Modules’ Table
General Requirements
Is area zoned?
Zone 1?
No
Constructional safety
Standard
START
Yes
Is equipment
Ex i concept?
d
EN 13463-5
ATEX
Code
IK08 IK09 IK10
2
fr
Flame-proof enclosure
GAS
Type of Protection
Intrinsic Safety
Mechanical Impacts (UK) Code EN50102
Impact
Energy
(Joules)
Flow restricting enclosure
EN 13463-3
Types of Protection
Indoor, from contact with contents
Indoor, limited, falling dirt and water
Outdoor, from rain, sleet, windblown dust & ice damage
Outdoor, from rain, sleet & ice damage
Indoor & outdoor, from windblown dust, rain, splashing
& hose directed water & ice damage
Indoor & outdoor, from corrosion, windblown dust, rain,
splashing & hose directed water & ice damage
Indoor & outdoor, from hose directed water, water entry
during submersion & ice damage
IK06 IK07
EN 13463-2
Protective
System
Groups
Abbreviated Protection Description
IK01 IK02 IK03 IK04 IK05
Module Annex Equipment Category *3
*1
*2 M1 M2 M2 1 2 2 3
(E) (N)
(E) (N)
Basic methods & requirements
* Must be IP6X if dust is electrically conductive
NEMA 7 to 10 Hazardous Area Enclosures
IK Code IK00
IP
Rating
ATEX Category
Conformity Assessment ‘Quality Modules’
(concepts)
EN 13463-1
Use a suitable
flameproof cable
gland with a
sealing ring.
(Gland with
elastomeric
seals)
Table 5 from IEC 60079-0
Radio-frequency Energy Thresholds
Equipment
for
Threshold power
(W)
Thermal Initiation Time
(averaging period)
(µs)
Equipment
for
Threshold Energy Zth
(µJ)
Group I
6.0
200
Group I
1500
Group IIA
6.0
100
Group IIA
950
Group IIB
3.5
80
Group IIB
250
Group IIC
2.0
20
Group IIC
50
Group III
6.0
200
Group III
1500
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The information in this wall chart is for guidance only. For detailed information see relevant Directives and Regulations.
© Extronics Ltd 2008 07/08