APPARATUS
FOR POTENTIALLY EXPLOSIVE ATMOSPHERES
Page
Introduction2
ATEX Directive 94/9/EC and IECEx
3
Hazardous areas
4-5
Identification ATEX and IECEx apparatus
6-7
Types of protection (gas, dust)
8-9
Types of protection "d" and "m"10
Types of protection "i" and "e"11
Equipment groups / temperature classes
Standardisation organisations
12-13
14
CENELEC standards
16
CENELEC standards - International standards
17
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Certification15
Apparatus for potentially explosive atmospheres
INTRODUCTION
GENERAL
The accidental ignition of an atmosphere containing a large quantity of gas, vapour, mists and/or dust may cause an explosion. Specific
measures have been taken on an international level in order to avoid any material damage or the loss of human lives.
These measures mainly apply to chemical and petrochemical industries where such hazardous atmospheres may be developed during
the production, transformation, transport and storage of flammable products. They also cover installations where combustible dust is
produced in the processing of pulverised and grain products (grinding and sieving).
SOME DEFINITIONS
B
What is a potentially explosive atmosphere?
3 elements must be combined to trigger an explosion:
The oxygen in the surrounding air = always present
A
A flammable substance (gas, vapours, mists or dusts)
B
A source of ignition: Electrical equipment / installation
C
or any source of heat
A spark or a flame are not the only sources of ignition. An increase of the
surface temperature of an electrical equipment may cause an explosion
if it exceeds the ignition temperature of the surrounding gas or mixture of
substances.
What is an explosive atmosphere?
A
C
Removing just one of the 3 elements
eliminates the entire risk
This is an atmosphere which could become explosive (the danger is potentially present) due to the local or operational condition in an
installation such as: leaks, rupture of pipeline, temperature variations, etc.
What is a gaseous or dusty explosive atmosphere?
This is a mixture with air, under atmospheric conditions, of flammable substances in the form of gases, vapours, mists or dusts in
which, after ignition has occurred, combustion spreads to the entire unburned mixture (definition according to Directive 1999/92/EC).
What is the fundamental difference between a gaseous and a dusty atmosphere?
It’s the density. The density of gases and vapours is approximately 1,000 times less than that of dusts. Gases are dispersed in the air
due to convection and diffusion, thereby creating a homogeneous atmosphere. Since dusts are much heavier than air, they have the
tendency to settle to the bottom more or less quickly.
What are the characteristic features of an explosive atmosphere caused by dust?
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For a dusty atmosphere to become explosive, the following four conditions must be present:
- The dust must be flammable (particle size < 0.3 mm in general).
- The atmosphere must contain an oxidiser (generally oxygen, even in a very small quantity).
- The dusts must be in suspension. (The explosion will be caused by the extremely rapid rate of combustion of the dust in the oxygen
in the air.)
- The dust concentration must be in the explosive range. (As a rule, the lower limit of explosion is around 50 g/m³.)
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Apparatus for potentially explosive atmospheres
ATEX DIRECTIVE 94/9/EC AND IECEx
OBJECTIVES OF THE ATEX DIRECTIVE 94/9/EC (“ATmosphères EXplosibles”)
To ensure free circulation of the products to which it is applicable throughout the territory of the European Union.
To remove barriers to trade via the New Approach by requiring a definition of essential requirements regarding safety and
health by which a high level of protection will be ensured (Annex II of Directive 94/9/EC).
To cover by a single directive both mining and surface equipment.
To increase the scope as compared to national regulations by providing for the first time essential safety and health requirements for:
- Non-electrical equipment intended for use in potentially explosive atmospheres [EN 13463-1 (2001)];
- Equipment intended for use in dusty environments as well as protective systems;
- Devices intended for use outside explosive atmospheres which are required for or contribute to the safe functioning of equipment or protective systems.
WHAT OBLIGATIONS DOES THE MANUFACTURER HAVE UNDER THIS DIRECTIVE?
The manufacturer has sole and ultimate responsibility for the conformity of his product to the applicable directives. He bears responsibility for:
-Ensuring the conformity of his products to the Directive (providing for certificates of conformity);
-Designing and constructing his products in accordance with the essential safety and health requirements;
-Following the procedures for the assessment of the conformity of the product.
EFFECTIVE DATE
Since 1 July 2003, all products placed on the market in the European Union have to conform to Directive 94/9/EC. Already installed
equipment need, however, not be replaced by equipment conforming to the ATEX directive.
WHAT ABOUT THE PRODUCTS AFTER 30 JUNE 2003?
After 30 June 2003, conformity to the ATEX directive is obligatory in order to enable free movement of products throughout the
European Union. Only the New Approach remains valid. It takes into account:
-
-
-
-
-
Hazardous areas;
CE Marking;
Dust atmospheres;
The CENELEC standards EN 60079-0 (EN 50014) for electrical equipment for explosive gas atmosphere;
Standard EN 13463 for non-electrical equipment for potentially explosive atmospheres.
WHAT ABOUT THE PRODUCTS AFTER 1 JULY 2006?
After 1 July 2006, standards EN 50014..28 are progressively replaced by the EN 60079 series of standards in the list of harmonised
standards. The same applies for EN 50281-1-1 (electrical apparatus for the use in the presence of combustible dust) which is replaced
by the EN 61241 series of standards.
If the equipment is not affected by substantial modifications of the new standards, the manufacturer does not need to apply for an
addition to the EC type-examination certificate.
Status of the harmonisation of these standards at the end of 2006:
EN 50014
Replaced by EN 60079-0.
EN 50018 «d»
Replaced by EN 60079-1.
EN 50019 «e»
Replaced by EN 60079-7.
EN 50020 «i»
Replaced by EN 60079-11.
EN 50021 «n»
Replaced by EN 60079-15.
EN 50028 «m» Replaced by EN 60079-18.
EN 50281-1-1
Replaced by EN 61241-0 and EN 61241-1.
WHAT IS THE IECEx CERTIFICATION?
The IECEx International Certification Scheme is a voluntary certification system. It offers a certification of conformity with the IEC
series of standards 60079, 61241 and 61779. This certification facilitates the international trade of electrical equipment intended for
use in explosive atmospheres and contributes to avoiding the multiplicity of national certifications while guaranteeing an adapted level
of safety. The certification is issued by an organisation recognised by IECEx, an ExCB (Ex Certification Body).
- It provides direct access to the markets in Australia, New Zealand etc.
- It simplifies access to local certifications in Russia, China, USA etc.
- It reduces the time and costs for certification due to its international recognition.
- All certificates issued are available for download worldwide under «Online Certificates» at IECEx.com.
The degree of hazard is currently defined according to the probability of the occurrence of explosive atmospheres. Equipment Protection Levels (EPLs) are introduced to enable an alternative approach to selecting Ex equipment by taking into account the potential
consequences of an explosion and other factors such as the toxicity of materials.
A risk assessment approach for the acceptance of explosion protected equipment has been introduced to clearly indicate the inherent
ignition risk of the equipment, no matter what type of protection is used.
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WHAT ARE EQUIPMENT PROTECTION LEVELS (EPLs)?
Apparatus for potentially explosive atmospheres
HAZARDOUS AREAS
SOME HISTORY
The classification of hazardous areas into zones established the level of protection required for electrical equipment installed in
explosive gas atmospheres (IEC 60079-10). Since this approach proved successful, it was applied to explosive dust atmospheres
(IEC-EN 61241-10).
The new edition of IEC 60079-0 (2007) [EN 60079-0 (2009)] progressively replaces IEC-EN 60079-10 and IEC-EN 61241-10 by the
two following standards:
IEC-EN 60079-10-1: Classification of areas, explosive gas atmospheres
IEC-EN 60079-10-2: Classification of areas, combustible dust atmospheres (dust groups/EPL)
The selection and erection of electrical installations is defined by standard EN 60079-14.
DEFINITION OF A PLACE WHERE A POTENTIALLY EXPLOSIVE ATMOSPHERE MAY OCCUR
The classification of an installation into distinct zones has two objectives (according to ATEX 1999/92/EC):
- To define the categories of equipment used in the zones indicated, provided they are suitable for gases, vapours or mists and/or
dusts.
- To classify hazardous places into zones to prevent ignition sources and be able to select the correct electrical and non-electrical
equipment accordingly. The zones are defined on the basis of the occurrence of explosive gaseous or dusty atmospheres.
GAS GROUPS
Group II
:Equipment intended for use in places with an explosive gas atmosphere other than mines susceptible to firedamp.
Group I:
Equipment intended for use in mines susceptible to firedamp.
Group II
Group I
(mines)
Zone
Category (ATEX 94/9/EC)
zone 0
1 G (1)
zone 1
2G
zone 2
3G
M1
M2
(1)
Presence of explosive atmospheres
Continuous, frequent or for long periods
Intermittent in normal operation (likely)
Occasional or for short periods (never in normal operation)
Presence (methane, dust)
Risk of presence (methane, dust)
DUST GROUPS (according to the fifth edition, IEC 60079-0, 2007 (EN 60079-0, 2009) (2))
Group III :Equipment intended for use in places with an explosive dust atmosphere other than mines susceptible to firedamp.
Group III
Zone
Category (ATEX 94/9/EC)
zone 20 1 D (1)
zone 21 2 D
zone 22 3 D
Presence of explosive atmospheres
Continuous, frequent or for long periods (air/cloud of combustible dust)
Intermittent in normal operation
Occasional or for short periods
The classification of the installation is the responsibility of the user. He must individually evaluate each installation to determine the
differences between them.
Separate assessments must be made for places with potentially explosive atmospheres caused by gases or vapours and
for those caused by dusts.
EQUIPMENT PROTECTION LEVELS - EPLs
In normal circumstances the effect of the EPLs will be to retain the normal zone/equipment protection relationship. If, however, the
risk is considered especially severe, then the required EPL for the zone may be increased. Similarly, if the risk is deemed to be
especially small or negligible, the EPL may be reduced from the norm.
The following table shows the normal relationship between EPL and zone/category (without supplementary risk assessment).
Equipment Protection Level (EPL)
Ga
Gb
Gc
Da
Db
Dc
Ma / Mb
G = gas ; D = dust ; M = mines
Including IEC 61241-0 (dusts)
Normal Applicable Zone(s)
0 (and 1 and 2)
1 (and 2)
2
20 (and 21 and 22)
21 (and 22)
22
mines
Category (94/9/EC)
1G
2G
3G
1D
2D
3D
M1 / M2
(1)
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(2)
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Apparatus for potentially explosive atmospheres
HAZARDOUS AREAS
A
Zone 0
Zone 1
Zone 2
Zone 22
B
Zone 21
Filter bag
Zone 20
Dust separator
Drawing A
Drawing B
of an explosive atmosphere caused by gas:
of an explosive atmosphere caused by dust: Zone 0
Zone 20
Zone 1
Zone 21
Zone 2
Zone 22
Above drawings Aand B are an example only and must not be used as a model for an actual plant whose design is, in every
case, the responsibility of the constructor and operator.
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EXAMPLES OF A CLASSIFICATION INTO ZONES
Apparatus for potentially explosive atmospheres
IDENTIFICATION ATEX
Specific symbol for explosion-proof:
- Electrical equipment [EN 50014] corresponding to a type of protection covered by European
Standards EN 50015 to EN 50028.
- Non-electrical equipment (EN 13463-1) and
types of protection EN 13463-2, 3, 4, 6 and 7,
EN 13463-5, EN 13463-8.
Epsilon x marking for equipment for use in
explosive atmospheres.
Identification number of the Notified Body
issuing the EC type-examination certificate.
(Example: 0081 = LCIE)
Conformity to the European Directives,
CE marking.
HOW CAN ATEX, EN 50014, EN 50281-1-1 OR EN 13463-1 APPROVED APPARATUS FOR USE IN EXPLOSIVE
ATMOSPHERES BE IDENTIFIED?
"d" : Flameproof enclosure
EN 50018
"e" : Increased safety
EN 50019
"i" : Intrinsic safety "ia""ib"
EN 50020
"m"
: Encapsulation EN 50028
"n"
: Non-incendive EN 50021
"o"
: Oil immersion
EN 50015
"p"
: Pressurisation
EN 50016
"q"
: Powder filling
EN 50017
"c"
: Constructional safety
EN 13463-5
-
: Dusts
EN 50281-1-1
TYPES
OF
PROTECTION
EQUIPMENT
GROUPS
0081 q II 2 G
EEx ia
IIC
0081 q II 2 GD
0081
I: Mines
II: Surface industries
(see page 10)
T6
c
II 2 D
q
T 85°C T6
IP65
Equipment category
(G = gas...; D = dust)
M1
M2
1 G or 1 D
2 G or 2 D
3 G or 3 D
TEMPERATURE
CLASSES
T 135°C
Degree of protection for
enclosures (EN 60529) at a
specified temperature class.
Maximum surface temperature
(Limitation due to presence of
clouds of dust)
Dust atmospheres
Marking to ATEX 94/9/EC
Additional marking of electrical equipment according to EN 50014
Additional marking of non-electrical equipment according to EN 13463-5
MARKING EXAMPLES
T
II2GD
0081
II1 GD EEx ia IIC
Tamb C
IP
TC
T. amb.
T
MEDIUM
CAT No / TYPE
c
T °C
YEAR
bar
PIPE
T.P.L
CATALOGUE N°
28111 LUCE FRANCE
SERIAL No
BP17 28111 LUCE FRANCE
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INERIS 03 ATEX0249X
Apparatus for potentially explosive atmospheres
IDENTIFICATION IECEx
Specific symbol for explosion-proof protection according to EN / IEC
Electrical apparatus, gas atmospheres:
"d": Flameproof enclosure EN 60079-1
"e": Increased safety EN 60079-7
"i": Intrinsic safety EN 60079-11 (ia/ib/ic)
"m": Encapsulation EN 60079-18 (ma/mb/mc)
"n": Non-incendive EN 60079-15 (nA/..)
Electrical apparatus, dust atmospheres:
"tD": Protection by enclosures EN 61241-1
"mD": Protection by encapsulation EN 61241-18
(maD/mbD)
"iD": Protection by intrinsic safety EN 61241-11
Non-electrical apparatus:
"c": Protection by constructional safety EN 13463-5
Dusts : D
Gas : G
TYPES OF PROTECTION
Mines : M1 M2
Categories : 1 (zone 0) - 2 (zone 1) - 3 (zone 2)
II : Surface industries
I : Mines
Epsilon x marking for equipment for use in explosive atmospheres.
Identification number of the Notified Body
issuing the EC type-examination certificate
(Example: 0081 = LCIE).
0081 q II 2 G
Ex
0081 q II 2 D
Ex tD
0081 q II 2 D
c
T85°C T6
d
t
IIB Gb
T6
IIIC Db IP67 T85°C
Ex
Ex
II2D Ex tD A21 IP65
II2G Ex d IIB+H2
d
IIC
A21
IP67 T135°C
0081
LCIE 01 ATEX 6050X
ma or ia = for use in
zone 0 gas (D = Dusts)
mb or ib = for use in
zone 1 gas (D = Dusts)
R
T4
Maximum
surface
temperature
A=
Prefix added to the
zone (example: 21)
to identify the test
method “A” (dust-tight
enclosure, IP6X)
Temperature class
Equipment groups
(IIA, IIB, IIC,
IIIA, IIIB, IIIC)
Equipment
Protection Level
(EPL)
Enclosure ingress
protection (IP)
rating for dust
(EN 60529)
Marking according to EN 60079-1 (electrical apparatus / gas atmospheres)
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Conformity to the European Directives,
CE marking.
HOW CAN ATEX, EN-IEC 60079-0, EN 61241-0 OR EN 13463-1 APPROVED APPARATUS FOR USE IN EXPLOSIVE
ATMOSPHERES BE IDENTIFIED?
Marking according to EN 61241-1 (electrical apparatus / combustible dust)
Marking according to EN 13463-5 (non-electrical apparatus)
Marking according to EN-IEC 60079-0 (2007), including EN 61241-0 ; EN-IEC 60079-1/EN-IEC 61241-1
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Apparatus for potentially explosive atmospheres
TYPES OF PROTECTION
WHAT IS A TYPE OF PROTECTION FOR ELECTRICAL APPARATUS FOR USE IN GAS ATMOSPHERES?
It is the comprehensive range of protective measures applied to an electrical apparatus to prevent possible ignition of the surrounding
atmosphere.
Protection
symbol
Zones
0
"d"
●
"i" "ib"
●
●
●
Type of protection in which measures are applied so as to prevent
with a higher degree of safety the possibility of excessive temperatures and of the occurrence of arcs or sparks in the interior
and on the external parts of electrical apparatus, which does not
produce them in normal service.
●
●
●
"ic"
"ma"
"m" "mb"
●
●
●
Description
2
Type of protection in which the parts which can ignite an explosive
atmosphere are placed in an enclosure which can withstand the
pressure developed during an internal explosion of an explosive
mixture and which prevents the transmission of the explosion to
the  explosive atmospheres surrounding the enclosure.
●
"e"
"ia"
1
●
●
●
●
"mc"
●
"n"
Type of protection when no spark or any thermal effect in the
circuit, produced in the test conditions prescribed in the standard
(which include normal operation and specific fault conditions), is
capable of causing ignition.
Drawing
R
U
L
C
Type of protection in which the parts which can ignite an explosive
atmosphere are enclosed in a resin sufficiently resistant to the
environmental influences in such a way that this explosive atmosphere cannot be ignited by either sparking or heating which may
occur within the encapsulation.
●
Method of protection for electrical equipment designed so that
it will not ignite the surrounding explosive atmosphere in normal
operation and under certain fault conditions specified in the standard. There are 4 categories of equipment: nA (non-sparking), nC
(enclosed break), nR (restricted breathing), nL (limited energy).
"o"
●
●
Type of protection in which the electrical apparatus is immersed
in oil.
"p"
●
●
Type of protection in which the protective inert gas inside the
enclosure is maintained at a higher pressure than that of the
surrounding atmosphere.
"q"
●
●
Type of protection in which the enclosure is filled with a material
in a finely granulated state.
80205GB-2013/R01
Types of protection offered:
- a wide range of certified solenoid valves with "d", "m", "em", "n" or "i" type of protection;
- certified air operated valves, pressure-operated valves, cylinders and air service equipment with "c" type of protection.
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Apparatus for potentially explosive atmospheres
TYPES OF PROTECTION
TYPES OF PROTECTION FOR ELECTRICAL APPARATUS FOR USE IN THE PRESENCE OF COMBUSTIBLE DUST (EN 60241-0)
Applicable to electrical apparatus for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion
hazard.
EN 61241-1 = tD ; EN 61241-18 = mD ; EN 61241-11 = iD
Protection
symbol
Zones
0
"tD"
maD
●
1
2
●
●
●
●
●
●
"mD"
mbD
"iD"
●
●
●
Description
Drawing
Electrical apparatus protected by enclosure and surface
temperature limitation for use in areas where combustible
dust may be present in quantities which could lead to a
fire or explosion hazard.
The ignition protection is based on the limitation of the
maximum surface temperature of the enclosure and other
surfaces which may come into contact with dust and on the
restriction of dust ingress into the enclosure by the use of
“dust-tight” or “dust-protected” enclosures.
This standard is not applicable to electrical apparatus
intended for use in underground parts of mines as well as
those parts of surface installations of such mines endangered by firedamp and/or combustible dust; nor does it
take account of any risk due to an emission of flammable
or toxic gas from the dust.
Electrical apparatus protected by encapsulation type of
protection ‘mD’ and surface temperature limitation for use in
areas where combustible dust may be present in quantities
which could lead to a fire or explosion hazard.
Type of protection in which the parts which can ignite an
explosive atmosphere are enclosed in a resin sufficiently
resistant to environmental influences in such a way that
a dust cloud or layer cannot be ignited during installation
or operation.
Intrinsically safe apparatus intended for use in potentially
explosive dust cloud or dust layer environments and for
associated apparatus that is intended for connection to
intrinsically safe circuits which enter such environments.
Applicable to electrical apparatus in which the electrical
circuits themselves are incapable of causing an explosion
in the surrounding combustible dust environment.
R
U
L
C
TYPE OF PROTECTION FOR NON-ELECTRICAL APPARATUS
EN 13463-5 = c
●
●
●
80205GB-2013/R01
"c"
This standard establishes manufacturing requirements
which have been proven safe, in order to avoid any inflammation sources such as friction or heating sparks.
It applies to apparatus where movement and friction can
occur (clutches, brakes, bearings, springs...).
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Apparatus for potentially explosive atmospheres
TYPES OF PROTECTION
What are the types of protection derived from standard EN 60079-0 (EN 50014) for ASCO ?
Description
FLAMEPROOF ENCLOSURE
The most currently used type of protection.
Standard equipment is contained in a sturdy
casing specifically designed for use in explosive
atmospheres.
Characteristics
CONSTRUCTION
Standard EN IEC 60079-1 includes elements of standard EN 50018 and specifies
the 2 following main characteristics for the construction of a "d" type enclosure to
prevent an internal inflammation from igniting the ambient atmosphere:
- the length "L" (in mm) of the flameproof seal;
- the maximum experimental safe gap (MESG) "i" (in mm).
flat seal
cylindrical seal
recessed seal
1
2
3
c
i
d
L=c+d
L
Features
"d"
- keeps an internal inflammation within a dimensionally stable enclosure;
-
prevents inflammation from penetrating the
ambient atmosphere;
-
keeps the outside temperature of the enclosure
below the ignition temperature of the ambient
gas, vapours or dusts.
L
The dimensions given depend on the seal and volume of the enclosure and gas
groups. Example: with a seal length L = 12.5 mm and an enclosure volume
≤ 100 cm3, the MESG "i" will be:
I : 0,5 mm seals included 1 / 2 IIB : 0,2 mm seals included 1 / 2
IIA : 0,3 mm seals included 1 / 2 IIC : 0,15 mm seals included 3
EN 60079-1: All non-threaded flamepaths have to be at 1.5 times the maximum
gap (if the maximum gap stated for a flange joint is 0.1 mm, the product will be
tested at 0.15 mm.
OPERATING VOLTAGE, TEMPERATURE
EN 60079-1:
- All equipment needs to be tested within the range of ±10 % of its operating
voltage;
- If the ambient temperature is below -20°C, a test to determine the reference
pressure is required unless a statement that the enclosure is unaffected by lower
temperatures (i.e. it does not become more brittle) is furnished.
WIRING (by cable gland certified to ATEX)
Standard EN 60079-1 specifies that the thread sizes (3/4 NPT, 1/2 NPT or M20)
must be marked on the product or label or indicated in the installation and maintenance instructions. The cable glands must be certified in accordance with this new
standard and must be appropriate for use within the ambient temperature range for
which the product is certified.
ENCAPSULATION
Easy to install, the enclosure with this type of
protection can be adapted to many models of
electrical equipment.
"m"
CONSTRUCTION
Standard EN 60079-18 (EN 50028) defines that this type of protection must be
used even in case of overvoltage or excessive current as a result of:
- an internal short-circuit;
- the valve with blocked core in an open circuit.
A fuse is required with alternating current. The maximum surface temperature may
not exceed the certified temperature class.
The coil and electrical components must be enclosed in a compound (example:
epoxy resin).
EN 60079-18: ma for zone 0 and mb for zone 1.
Features
-prevents ignition of the ambient explosive
atmosphere.
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8-05-10
WIRING
By cable with 3 flying leads embedded in a compound. This airtight sealing prevents
the ambient explosive atmosphere from penetrating the enclosure.
80205GB-2013/R01
- encloses in a compound the electrical
parts which are likely to ignite the ambient
explosive atmosphere;
Apparatus for potentially explosive atmospheres
TYPES OF PROTECTION
Description
Characteristics
INTRINSIC SAFETY
This type of protection takes into account the minimum
energy necessary to ignite an explosive atmosphere.
The whole circuit is designed in such a way that this
energy must never be available, neither in normal
operation nor in specific faulty operating conditions.
WHAT IS EN 50020 BASED ON?
How?
(Future EN 60079-11)
Explosion groups:
identical to the type of protection "d", IIA-IIB-IIC.
Energy storage:
During circuit opening / closing, inductance or capacitance may partially release
its energy in addition to the ignition power already available. A safety factor must
then be applied.
What about the electrical components?
A distinction is made between apparatus rated intrinsically safe and their
"associated components" in which the circuits may themselves be either intrinsically safe or not.
Example of an intrinsically safe circuit:
DEVICES FOR ELECTRICAL SUPPLY
-By limiting peak current and no-load voltage;
-By limiting thermal and electric energy storage.
Unlike the other types of protection which apply to
single electrical components, this one applies to the
whole circuit.
Safety barrier
Non-hazardous zone
Reg.
amplifier
Explosive zone
Rv
D1
D2
EEx i
Receiver
or
sensor
It limits the available power in a circuit to specific values. The voltage is limited by
Zener diodes, current by resistances (standard barriers) or by electronic systems
(special barriers).
It isolates the intrinsically safe circuit without galvanic barriers. To operate correctly,
it must be connected to a reference potential = 0 (equipotential earth). This solution
is preferable to interfaces (see below) which require a common earth.
1
"i"
2
1
2
What about the zones?
Some components may present defects (reliability).
Intrinsically safe components are classified into "ia"
and "ib" groups depending on the number of defects
and their location in hazardous area:
"ia" (zones 0, 1 & 2): 2 defects= intrinsically safe
"ib" (zones 1 & 2):
1 defect = intrinsically safe
3
+
-
U1
fuse
Zener diodes
zero potential (equi-
potential earth or
interconnected earth)
3
Galvanic barrier (interface)
Other intrinsically safe apparatus with galvanic barriers are used for various applications:
-Current-transmitters for 2-lead converters;
-Transmitters;
-Converters: temperature converters, electropneumatic I/P or P/I;
-Amplifier relays;
-Power packs with galvanic barriers.
The voltage U2 at the entrance of an interface must be lower than the barrier voltage
U1 (U2 < U1).
1
2
3
4
5
U2
6
+
-
1
2
3
4
rectifier
filter
logic control
galvanic protection
(transformer)
output voltage
adjustment
6 galvanic isolation
(optocoupler)
5
Prevents the occurrence of any accidental ignition
source: arcs or sparks. Sparking components are
excluded from this method of protection.
How?
"e"
- Use of high quality insulation materials;
- Min. IP54 ingress protection to reduce the probability of contamination by dirt and moisture
ingress;
- Special enclosure with connections which cannot
become loose;
- Taking account of specified temperature classes;
- Conformity of cable entries and labelling.
WHAT IS EN 60079-7 (EN 50019) BASED ON?
Explosion group:
I or II; Group II includes subdivisions IIA-IIB-IIC.
Temperature class:
The temperature which must be taken into account is that of the hottest point of
the equipment as a whole and not that of the external temperature as is the case
with flameproof enclosures.
The temperature classification is identical to that of protection type “d”.
CONNECTION
Securely fastened certified cable gland
always supplied mounted on the product.
80205GB-2013/R01
INCREASED SAFETY
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PIC-8-05-11
Apparatus for potentially explosive atmospheres
EQUIPMENT GROUPS / TEMPERATURE CLASSES
CLASSIFICATION OF GASES INTO EXPLOSION GROUPS
Group I :Electrical equipment intended for use in the underground parts of mines, and to those parts of surface installations of
such mines, likely to become endangered by firedamp and/or combustible dust.
Group II :Electrical equipment intended for use in other places likely to become endangered by explosive atmospheres (surface
industries).
For the types of protection "d" and "i", group II is subdivided into IIA, IIB, IIC. Electrical apparatus certified for IIB may be used in
applications requiring apparatus to be certified for group IIA. Electrical apparatus certified for IIC may be used in applications requiring
apparatus to be certified for groups IIA and IIB.
For example the "d" and "i" types of protection are respectively subdivided according to the Maximum Experimental Safe Gap (MESG)
and to the Minimum Igniting Current (MIC).
Electrical apparatus certified for IIB may be certified for use with a gas belonging to group IIC. In this case, the identification is supplemented with the chemical symbol or the name of the gas (example: Ex d IIB + H2 according to EN 60079-0 and EN 60079.1).
The table below indicates the groups to which some gas mixtures belong:
Groups
I
A
II
B
C
Gas
Ignition temperature (1) (°C)
methane (firedamp)
acetone
acetic acide
ammonia
ethane
methylene chloride
methane (CH4)
carbon monoxyde
propane
n-butane
n-butyl
n-hexane
acetaldehyde
ethyl ether
ethyl nitrite
ethylene
ethyl oxyde
hydrogen sulfide
acetylene (C2H2)
carbon disulphide (CS2)
hydrogen (H2)
540
485
630
515
556
537
605
470
365
370
240
140
160
90
425
429-440
270
305
102
560
Temperature class
T1
T2
T3
T4
T5
T6
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Temperature of a hot surface able to ignite a gas mixture.
The ignition temperature of the gas mixture must be higher than the maximum surface temperature. In practice, a 10 to 20% safety margin is
observed between the ignition temperature and the rated nameplate temperature.
The ignition temperature of a cloud of dust is generally between 300 and 700°C. At 150 to 350°C, the ignition temperature of a layer of dust is far
below that of a dust cloud. A burning dust layer can initiate a dust explosion if brought in contact with a combustible dust cloud, so these values
must be taken into account to limit the risk.
(1)
TEMPERATURE CLASS
The temperature classification is based on the maximum surface temperature of equipment. That is the highest temperature any part
of or the entire surface of an electrical device can reach under the most unfavourable operating conditions capable of igniting a surrounding explosive atmosphere.
Group I :Temperature ≤ 150°C or ≤ 450°C according to coal dust accumulation on equipment
Group II: Equipment must be classified and marked:
- preferably with the temperature class (T classification)
- defined by the surface temperature or,
- limited to the specified flammable gases or dusts for which it is approved, if necessary (and marked accordingly).
Maximum surface temperature (°C)
450
300
200
135
100
85
Ignition temperature (1) (°C)
> 450
> 300
> 200
> 135
> 100
> 85
80205GB-2013/R01
Temperature class
T1
T2
T3
T4
T5
T6
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8-05-12
Apparatus for potentially explosive atmospheres
EQUIPMENT GROUPS / TEMPERATURE CLASSES
CLASSIFICATION OF DUSTS INTO EXPLOSION GROUPS (according to the fifth edition, IEC 60079-0, 2007)
Group III :Electrical equipment intended for use in places with an explosive dust atmosphere other than mines susceptible to
firedamp.
Group III is subdivided into IIIA (combustible flyings), IIIB (non-conductive dust) and IIIC (conductive dust).
Combustible dust: Finely divided solid particles, 500 µm or less in nominal size, which may be suspended in air, may settle out of
the atmosphere under their own weight, may burn or glow in air, and may form explosive mixtures with air at atmospheric pressure
and normal temperatures.
Non-conductive dust: Combustible dust with electrical resistivity greater than 103 Ω.m
Conductive dust: Combustible dust with electrical resistivity equal to or less than 103 Ω.m
Combustible dust
Starch
Aluminium
Cotton
Cereals
Magnesium
Soybean
Sulphur
Tabacco
Ignition temperature (1)
(°C)
440
530
560
420
610
500
280
450
Self-ignition temperature
of dust layers (1) (°C)
290
280
350
290
410
245
280
300
The maximum surface temperature must be identified and suitable for the specified type of dust present (equipment marked for zone 21).
In order to prevent the ignition of dusty atmospheres, the maximum surface temperature needs to be limited. It must not exceed:
- 2/3 of the auto-ignition temperature of the specified cloud of dust,
- the auto-ignition temperature of a 5 mm layer of dust minus 75°C.
80205GB-2013/R01
(1)
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PIC-8-05-13
Apparatus for potentially explosive atmospheres
STANDARDISATION ORGANISATIONS
IEC / CENELEC COOPERATION
The main CENELEC EN 50014 standard (General Requirements) pertaining to electrical apparatus for potentially explosive atmospheres was originally published in 1977.
It is derived from the IEC Publications 79.
From that date, these 2 organisations have constantly intensified their cooperation. The new series of standards 6 (60079-0, etc.) which gradually replace the old
standards are an example for the approximation between European and international
standards.
WHAT ARE THESE 2 ORGANISATIONS?
IEC
The "International Electrotechnical Commission" (IEC), founded in 1906, has its head
office in Geneva. The commission is currently composed of 55 national committees
and 19 associate members. Its purpose is "fostering international cooperation in all
issues relative to standardisation and in related subjects such as certification in the
fields of electricity and electronics, and thus favouring international exchanges".
Since 1976, the IEC has been cooperating with the International Standard Organisation (ISO), among others.
IEC
Commission
of the European
communities
European
Free Trade
Association
CENELEC
CENELEC
The "European Committee for Electrotechnical Standardisation" (CENELEC) is a technical organisation located in Brussels. It is composed of the National Electrotechnical
Committees from 31 European countries and 11 affiliated countries. The committee's
major role is to harmonise national standards to produce a single European Standard
("EN").
In 1958, the standardisation process started, and in 1973, the name CENELEC was
adopted with the expansion of the Common Market.
Within the CENELEC, the Technical Committee 31 is in charge of elaborating the
standards for electrical apparatus intended for use in explosive atmospheres.
National
committees
Full participation
of all interested
parties
ELECTROTECHNICAL
STANDARDS
for EUROPE
WHAT IS CEN?
CEN (European Committee for Standardisation) works in close partnership with CENELEC. CEN is a “European forum” for standardisation, with the exception of electro-technology, which fosters and organises relations between governments, governmental
bodies, producers, users, consumers, trade unions etc. This is, in particular achieved by:
-harmonising published national standards and promoting ISO standards;
-elaborating new EN standards, developing procedures for the mutual recognition of test results etc.
(Example: Standards EN 13463-1 to 8 for non-electrical apparatus).
LATEST DEVELOPMENTS IN THE STANDARDISATION OF EXPLOSIVE ATMOSPHERES
CENELEC and CEN have been entrusted with developing new directives as a support to harmonise the legislation of the Member
States of the European Union.
Key dates to bear in mind:
- 23 March 1994: Creation of Directive 94/9/EC (also called ATEX or ATEX 100A) in replacement of Directives 76/117/EEC,
79/196/EEC, 82/130/EEC. The directive is to form the basis of the current regulations relating to electrical and non-electrical equipment for explosive atmospheres.
- From 1996, transposition of the directive in the Member States of the European Union. Start of the transitory period allowing for
a progressive adaptation of the manufacture of products to the requirements of the directive.
- 30 June 2003, end of the transitory period: All products placed on the market throughout the European Union from 1 July 2003
must fulfil the safety and health requirements of Directive 94/9/EC.
- 2006-2009: Gradual application of the new harmonised series of standards “6” (EN 60079-0, EN 60214-0, etc.). The series of
standards “5” (EN 50014, EN 50281-1-1 etc.) will cease to apply due to the substantial modifications required by some of the
series of standards “6”.
- Requirements for explosive dust atmospheres transferred from IEC 61241-0
- The marking Group II alone has been replaced by IIA, IIB or IIC
- Dusts groups defined as Group IIIA, IIIB and IIIC
- Limits for ultrasonic and electromagnetic radiation introduced
- Remainder of “electrostatic” requirements transferred from IEC 60079-26
- Equipment protection levels (EPLs) introduced
All leaflets are available on: www.asconumatics.eu
8-05-14
80205GB-2013/R01
-
2007: The significant changes in the 5th edition of IEC 60079-0 are:
Apparatus for potentially explosive atmospheres
CERTIFICATION
WHO ISSUES THE CERTIFICATE OF CONFORMITY?
Some of the approved organisations for testing and certification according to ATEX are mentioned below.
The certificates of conformity according to ATEX issued by these organisations are recognised by all the Member States of the European Union.
An IECEx certification based on the International Electrotechnical Commission’s (IEC) international standards for equipment for used in explosive
atmospheres can also be issued by some of the organisations mentioned below.
Belgium
ATEX
IECEx
N°
●
26
Czech Republic
●
1026
●
FTZU
Denmark
●
539
●
UL/DEMKO
Finland
●
537
●
VTT
●
80
●
INERIS
●
81
●
LCIE
Laboratoire Central des Industries Electriques - Fontenay-aux-Roses
●
32
●
TÜV
Technischer Überwachungs-Verein Nord CERT - Hannover
●
35
●
TÜV
TÜV Anlagentechnik Unternehmensgruppe TÜV Rheinland/Berlin-Brandenburg - Köln
●
102
●
PTB
Physikalisch-Technische Bundesanstalt - Braunschweig
●
123
●
TÜV
Technischer Überwachungs-Verein Product Service - München
●
158
DMT
Deutsche Montan Technologie - Essen
Country
France
Germany
Logo
Notified bodies
AIB
Vinçotte International S.A. - Bruxelles
Fyzikáln technický zkušební ústav (Physical Technical Testing Institute) - Radvanice
Danmarks Elektriske Materielkontrol - Herlev
VTT Industrial Systems (VTT Tuotteet ja Tuotanto) - VTT
Institut National de l’Environnement Industriel et des Risques - Verneuil-en-Halatte
●
EXAM
Dekra EXAM
Institut für Sicherheitstechnik Institut an der Technischen Universität - Bergakademie - Freiberg
●
637
●
IBExU
●
820
●
ZELM EX
●
BKI
●
CESI
Centro Eletrotecnico Sperimentale Italiano - Milano
Hungary
●
Italy
●
722
Luxembourg
●
499
Netherlands
●
●
●
Prüf-und Zertifizierungsstelle - Braunschweig
Hungarian Approval Service for Ex-proof Electrical Equipment - Mikovuny
SNCH
Société Nationale de Certification et d’Homologation - Sandweiler
344
●
KEMA
KEMA Quality B.V. - Arnhem
470
●
NEMKO
575
●
DNV
Russia
●
MANIO CCVE
Slovenia
●
SIQ
Slovenian Institute of Quality and Metrology - Ljubljana
LOM
Laboratorio Oficial Jose Maria de Madariaga - Madrid
Norway
Spain
●
163
Sweden
●
402
Switzerland
●
1258
●
359
●
518
●
United Kingdom
●
SP
NEMKO AS - Oslo
DET Norsk Veritas Certification - Hovik
Certification Centre of explosion-proof and mine electrical equipment
Swedish National Testing and Research Institute LTD - Boras
SEV
Swiss Electrotechnical Association - Fehraltorf
●
ITS
Testing and Certification LTD - Leatherhead
●
SIRA
Certification Service Sira Test & Certification Limited - Kent
600
EECS
Electrical Equipment Certification Servicehealth and Safety Executive - Buxton
●
891
TRL
●
1180
●
BASEEFA 2001
Compliance Services LTD - Up Holland
British Approval Service for Electrical Equipment in Flammable Atmospheres - Buxton
(2008)
Obtaining the certificate:
-
gives proof of the conformity of equipment with the Certificate standards;
- authorises the manufacturer to issue a copy of the Certificate;
-
gives the testing authorities delivering the certificate free access to the
manufacturer's production units.
The marking of a certified product must specify:
- the name of the manufacturer or his registered trademark;
- the description of the manufacturer's product;
- its identification by means of the code (eg : Ex d IIC T4);
- the name or logo of the testing authority;
-
the reference to the type examination certificate according to
ATEX 94/9/EC and/or the IECEX number for an IEC certification.
What are the obligations of the person installing the equipment?
-He must select electrical apparatus certified for use in explosive
atmospheres under specific conditions.
- He must install them according to each zone defined by the user.
What are the obligations of the user?
- He is responsible for using certified equipment in hazardous areas.
- He must carry out regular maintenance work and ensure the safety of
the installation and staff.
80205GB-2013/R01
What does this mean for the manufacturer?
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PIC-8-05-15
Apparatus for potentially explosive atmospheres
CENELEC STANDARDS
THE EUROPEAN STANDARDS
The old standards for electrical equipment (EN 50014 series) were established starting 1977. A second revised edition was published in 1993.
In order to be able to use these standards, the European Commission established Directive 97/53/EC which allows the issuance of
Certificates of Conformity related to Directive 94/9/EC.
The second editions of the standards are at the basis of the third editions. No fundamental technical modification is necessary to ensure
conformity with the essential safety requirements laid down in the directive.
Other standards: EN 50281-1-1/2 and EN 50281-2-1 (CENELEC, dusts); EN 13463-1 to 8 (non-electrical apparatus, CEN)
In the ongoing standardisation process for electrical apparatus, IEC standards will progressively be adopted as CENELEC standards.
These standards can be identified by their numbers (series 60000, e.g. EN 60079-10, classification of hazardous gaseous areas to ATEX).
TABLE OF CORRELATION BETWEEN NATIONAL STANDARDS AND THE CENELEC STANDARD
GENERAL REQUIREMENTS
Member countries
EN 50014
Austria
Belgium
Bulgaria
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Iceland
Ireland
Italy
Latvia
Lithuania
Luxembourg
Malta
Netherlands
Norway
National standards
EN 60079-0
ÖVE EN 50014
NBN-EN 50014
BDS EN 50014
HRN EN 50014
CSN EN 50014
DS/EN 50014
EVS-EN 50014
SFS-EN 50014
NF EN 50014
DIN EN 50014
ELOT EN 50014
MSZ EN 50014
IST EN 50014
I.S. EN 50014
CEI EN 50014
LVS EN 50014
LST EN 50014
EN 50014
MSA EN 50014
NEN-EN 50 014
NEK EN 50 014
Member countries
ÖVE/ÖNORM EN 60079-0
NBN-EN 60079-0
BDS EN 60079-0
HRN EN 60079-0
CYS EN 60079-0
CSN EN 60079-0
DS/EN 60079-0
EVS-EN60079-0
SFS-EN 60079-0
NF EN 60079-0
DIN EN 60079-0
ELOT EN 60079-0
MSZ EN 60079-0
IST EN 60079-0
I.S. EN 60079-0
CEI EN 60079-0
LVS EN 60079-0
LST EN 60079-0
EN 60079-0
MSA EN 60079-0
NEN-EN 60079-0
NEK EN 60079-0
National standards
EN 60079-0
EN 50014
Poland
Portugal
Romania
Slovakia
Slovenia
Spain
Sweden
Switzerland
United Kingdom
Affiliated countries
PN-EN 50014
EN 50014
SR EN 50014
STN EN 50014
SIST EN 50014
UNE EN 50014
SS EN 50014
SN EN 50014
BS EN 50014
PN-EN 60079-0
EN 60079-0
SR EN 60079-0
STN EN 60079-0
SIST EN 60079-0
UNE EN 60079-0
SS-EN 60079-0
SN EN 60079-0
BS EN 60079-0
EN 50014
EN 60079-0
Albania
Belarus
Bosnia & Herzegovina
Former Youg. Rep. of Macedonia
Israël
Libya
Montenegro
Serbia
Tunisia
Turkey
Ukraine
-
S SH EN 60079-0
TS EN 60079-0
-
TYPES OF PROTECTION
Austria
Belgium
Bulgaria
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Iceland
Ireland
Italy
Latvia
Lithuania
Luxembourg
Malta
Netherlands
Norway
Poland
Portugal
Romania
Slovakia
Slovenia
Spain
Sweden
Switzerland
United Kingdom
«d»
«e»
«i»
«m»
«n»
EN 50021
(EN 60079-15)
combustible dust
«c»
EN 60079-1
EN 60079-7
EN 50020
EN 60079-18
EN 61241-1
EN 13463-5
ÖVE/ÖNORM EN 60079-1
NBN-EN 60079-1
BDS EN 60079-1
HRN EN 60079-1
CYS EN 60079-1
CSN EN 60079-1
DS EN 60079-1
EVS EN 60079-1
SFS-EN 60079-1
NF EN 60079-1
DIN EN 60079-1
EN 60079-1
MSZ EN 60079-1
IST EN 60079-1
I.S. EN 60079-1
CEI EN 60079-1
LVS EN 60079-1
LST EN 60079-1
EN 60079-1
MSA EN 60079-1
NEN-EN 60079-1
NEK-EN 60079-1
PN-EN 60079-1
EN 60079-1
SR EN 60079-1
STN EN 60079-1
SIST EN 60079-1
UNE EN 60079-1
SS EN 60079-1
SN EN 60079-1
BS EN 60079-1
ÖVE/ÖNORM EN 60079-7
NBN EN 60079-7
BDS EN 60079-7
HRN EN 60079-7
CSN EN 60079-7
DS EN 60079-7
EVS EN 60079-7
SFS-EN 60079-7
NF EN 60079-7
DIN EN 60079-7
EN 60079-7
MSZ EN 60079-7
IST EN 60079-7
I.S. EN 60079-7
CEI EN 60079-7
LVS EN 60079-7
LST EN 60079-7
EN 60079-7
MSA EN 60079-7
NEN-EN 60079-7
NEK-EN 60079-7
PN-EN 60079-7
EN 60079-7
SR EN 60079-7
STN EN 60079-7
SIST EN 60079-7
UNE EN 60079-7
SS EN 60079-7
SN EN 60079-7
BS EN 60079-7
ÖVE EN 50020
NBN EN 50020
BDS EN 50020
HRN EN 50020
CSN EN 50020
DS EN 50020
EVS EN 50020
SFS EN 50020
NF EN 50020
DIN EN 50020
NF EN 50020
MSZ EN 50020
IST EN 50020
I.S./ EN 50020
CEI EN 50020
LVS EN 50020
LST EN 50020
EN 50020
MSA EN 50020
NEN-EN 50020
NEK-EN 50020
PN-EN 50020
EN 50020
SR EN 50020
STN EN 60079-7
SIST EN 50020
UNE EN 50020
SS EN 50020
SN EN 50020
BS EN 50020
ÖVE/ÖNORMEN 60079-18
NBN EN 60079-18
BDS EN 60079-18
HRN EN 60079-18
CYS EN 60079-18
CSN EN 60079-18
DS EN 60079-18
EVS EN 60079-18
SFS-EN 60079-18
NF EN 60079-18
DIN EN 60079-18
EN 60079-18
MSZ EN 60079-18
IST EN 60079-18
I.S. EN 60079-18
CEI EN 60079-18
LVS EN 60079-18
LST EN 60079-18
EN 60079-18
MSA EN 60079-18
NEN-EN 60079-18
NEK-EN 60079-18
PN-EN 60079-18
EN 60079-18
SR EN 60079-18
STN EN 60079-78
SIST EN 60079-18
UNE EN 60079-18
SS EN 60079-18
SN EN 60079-18
BS EN 60079-18
ÖVE/ÖNORM EN 50021
NBN EN 50021
BDS EN 50021
HRN EN 50021
CYS EN 50021
CSN EN 50021
DS EN 50021
EVS EN 50021
SFS-EN 50021
NF EN 50021
DIN EN 50021
ELOT EN 50021
MSZ EN 50021
IST EN 50021
I.S. EN 50021
CEI EN 50021
LVS EN 50021
LST EN 50021
EN 50021
MSA EN 50021
NEN-EN 50021
NEK-EN 50021
PN-EN 50021
EN 50021
SR EN 50021
STN EN 50021
SIST EN 50021
UNE EN 50021
SS EN 50021
SN EN 50021
BS EN 50021
ÖVE/ÖNORM EN 61241-1
NBN EN 61241-1
BDS EN 61241-1
HRN EN 61241-1
CSN EN 61241-1
DS EN 61241-1
EVS EN 61241-1
SFS EN 61241-1
NF EN 61241-1
DIN EN 61241-1
ELOT EN 61241-1
MSZ EN 61241-1
IST EN 61241-1
I.S./ EN 61241-1
CEI EN 61241-1
LVS EN 61241-1
LST EN 61241-1
EN 61241-1
MSA EN 61241-1
NEN-EN 61241-1
NEK-EN 61241-1
PN-EN 61241-1
EN 61241-1
SR EN 61241-1
STN EN 61241-1
SIST EN 61241-1
UNE EN 61241-1
SS EN 61241-1
SN EN 61241-1
BS EN 61241-1
ÖVE ÖNORM EN 13463-5
NBN-EN 13463-5
BDS 13463-5
HRN EN 13463-5
CSN EN 13463-5
DS / EN 13463-5
EVS- EN 13463-5
SFS-EN 13463-5
NF EN 13463-5
DIN EN 13463-5
ELOT EN 13463-5
MSZ EN 13463-5
IST EN 13463-5
I.S. EN 13463-5
CEI EN 13463-5
LVS EN 13463-5
LST EN 13463-5
EN 13463-5
MSA EN 13463-5
NEN-EN 13463-5
NEK-EN 13463-5
PN EN 13463-5
EN 13463-5
SR EN 13463-5
STN EN 13463-5
SIST EN 13463-5
UNE-EN 13463-5
SS EN 13463-5
SN EN 13463-5
BS EN 13463-5
TS EN 60079-7
TS EN 50020
TS EN 60079-18
BAS EN 50021
TS EN 50021
TS EN 61241-1
BAS EN 13463-5
TS EN 13463-5
National standards
Affiliated countries
Bosnia & Herzegovina Turkey
TS EN 60079-1
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8-05-16
80205GB-2013/R01
type
CENELEC/CEN
standards
Member countries
Apparatus for potentially explosive atmospheres
INTERNATIONAL STANDARDS
INTERNATIONAL CLASSIFICATION OF ZONES
Standards
Hazardous areas
Zone 0 (gas, vapours)
or 20 (dust)
permanent, frequent
or for a long period of time
IEC
CENELEC
US
NEC 505
Zone 1 (gas, vapours)
or 21 (dust)
intermittent
in normal operation (likely)
Zone 0
Zone 2 (gas, vapours)
or 22 (dust)
occasional, or for short periods
(never in normal operation)
Zone 1
NEC 500
Zone 2
Division 1
Division 2
INTERNATIONAL TYPES OF PROTECTION
0
1
2
Type of protection
Applicable certification
UL
FM
CSA
IEC
CENELEC
Intrinsic safety "ia"
UL 2279, Pt.11
__
CSA-E79-11
IEC 60079-11
EN 50020 (EN 60079-11)
Classe I, Div. 1
ANSI/UL 913
FM 3610
CSA-157
__
__
Encapsulation "m"
UL 2279, Pt.18
FM 3614
CSA-E79-18
IEC 60079-18
EN 60079-18 (EN 50028)
Flameproof enclosure "d"
UL 2279, Pt.1
FM 3618
CSA-E79-1
IEC 60079-1
EN 60079-1 (EN 50018)
Increased safety "e"
UL 2279, Pt.7
FM 3619
CSA-E79-7
IEC 60079-7
EN 60079-7 (EN 50019)
Intrinsic safety "ib"
UL 2279, Pt.11
FM 3610
CSA-E79-11
IEC 60079-11
EN 50020 (EN 60079-11)
Oil immersion "o"
UL 2279, Pt.6
FM 3621
CSA-E79-6
IEC 60079-6
EN 50015
Powder filling "q"
UL 2279, Pt.5
FM 3622
CSA-E79-5
IEC 60079-5
EN 50017
Pressurised apparatus "p"
UL 2279, Pt.2
FM 3620
CSA-E79-2
IEC 60079-2
EN 50016
Non-incendive "NI"
UL 2279, Pt.15
FM 3611
CSA-E79-15
IEC 60079-15
EN 50021 (EN 60079-15)
Non-sparking device "nA"
UL 2279, Pt.15
__
CSA-E79-15
IEC 60079-15
EN 50021 (EN 60079-15)
Restricted breathing "nR"
UL 2279, Pt.15
__
CSA-E79-15
IEC 60079-15
EN 50021 (EN 60079-15)
Hermetically sealed "nC"
UL 2279, Pt.15
__
CSA-E79-15
IEC 60079-15
EN 50021 (EN 60079-15)
TYPE EXAMINATION CERTIFICATES
SELECTION OF PRODUCTS
available at "www.asconumatics.eu"
Certificates issued by the IECEx Certified Equipment Program are issued as “Electronic Certificates” and are
live on the IECEx Website. This enables full public access for viewing and printing. Visit the IECEx “On-Line
Certificate” System.
All leaflets are available on: www.asconumatics.eu
PIC-8-05-17
80205GB-2013/R01
Zone
All leaflets are available on: www.asconumatics.eu
8-05-18
PIC-08-0005-GB -- Availability, design and specifications are subject to change without notice. All rights reserved.
80205GB-2013/R01