Download pdf - APPARATUS FOR POTENTIALLY EXPLOSIVE … selection and erection of electrical installations is defined by standard EN 60079-14. DEFINITION OF A PLACE WHERE A POTENTIALLY EXPLOSIVE ATMOSPHERE

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Page

Introduction 2

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 12-13

Standardisation organisations 14

Certification 15

CENELEC standards 16

CENELEC standards - International standards 17

APPARATUS FOR POTENTIALLY EXPLOSIVE ATMOSPHERES

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C

B

A

Removing just one of the 3 elements eliminates the entire risk

A C

B

GENERALThe 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

What is an explosive atmosphere?

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?

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.)

What is a potentially explosive atmosphere?

3 elements must be combined to trigger an explosion:

The oxygen in the surrounding air = always present

A flammable substance (gas, vapours, mists or dusts)

A source of ignition: Electrical equipment / installation 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.

Apparatus for potentially explosive atmospheresINTRODUCTION

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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 require-ments 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 equip-

ment 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 respon-sibility 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.

WHAT ARE EQUIPMENT PROTECTION LEVELS (EPLs)?

The degree of hazard is currently defined according to the probability of the occurrence of explosive atmospheres. Equipment Protec-tion 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.

Apparatus for potentially explosive atmospheresATEX DIRECTIVE 94/9/EC AND IECEx

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Apparatus for potentially explosive atmospheresHAZARDOUS 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 atmospheresIEC-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.

Zone Category (ATEX 94/9/EC) Presence of explosive atmospheres

Group IIzone 0 1 G (1) Continuous, frequent or for long periodszone 1 2 G Intermittent in normal operation (likely)zone 2 3 G Occasional or for short periods (never in normal operation)

Group I(mines)

M1 (1) Presence (methane, dust)M2 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.

Zone Category (ATEX 94/9/EC) Presence of explosive atmospheres

Group IIIzone 20 1 D (1) Continuous, frequent or for long periods (air/cloud of combustible dust)zone 21 2 D Intermittent in normal operationzone 22 3 D 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) Normal Applicable Zone(s) Category (94/9/EC)Ga 0 (and 1 and 2) 1GGb 1 (and 2) 2GGc 2 3GDa 20 (and 21 and 22) 1DDb 21 (and 22) 2DDc 22 3D

Ma / Mb mines M1 / M2(1) G = gas ; D = dust ; M = mines(2) Including IEC 61241-0 (dusts)

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Apparatus for potentially explosive atmospheresHAZARDOUS AREAS

Zone 0

Zone 1

Zone 2

B

A

Dust separator

Filter bag

Zone 22

Zone 20

Zone 21

Above drawings A and 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.

EXAMPLES OF A CLASSIFICATION INTO ZONESDrawing A of an explosive atmosphere caused by gas: Zone 0 Zone 1 Zone 2Drawing B of an explosive atmosphere caused by dust: Zone 20 Zone 21 Zone 22

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Apparatus for potentially explosive atmospheresIDENTIFICATION ATEX

II 2 D IP65 T 135°C

0081 q II 2 G

0081 q II 2 GD

EEx ia IIC T6

0081

c T 85°C T6

q

28111 LUCE FRANCE

II1 GD EEx ia IIC0081INERIS 03 ATEX0249X

T Tamb C

CAT No / TYPE

IPT CYEAR

II2GD cT. amb.

SERIAL No

PIPEbar

T.P.LCATALOGUE N°

MEDIUM

T T °C

B P 1 7 2 8 1 1 1 L U C E F R A N C E

HOW CAN ATEX, EN 50014, EN 50281-1-1 OR EN 13463-1 APPROVED APPARATUS FOR USE IN EXPLOSIVE ATMOSPHERES BE IDENTIFIED?

Con

form

ity to

the

Eur

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n D

irect

ives

, C

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ng

.

Iden

tifi

cati

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nu

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f th

e N

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ple:

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IE)

Ep

silo

n x

mar

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for

equi

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mos

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es.

TEMPERATURECLASSES

EQUIPMENT GROUPS

"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

TYPESOF

PROTECTION

MARKING EXAMPLES

Marking to ATEX 94/9/EC

Additional marking of electrical equipment according to EN 50014

Dust atmospheres

Equipment category (G = gas...; D = dust)

M1M2

1 G or 1 D2 G or 2 D3 G or 3 D

Degree of protection for enclosures (EN 60529) at a specified temperature class.

Maximum surface temperature (Limitation due to presence of

clouds of dust)

I: Mines

II: Surface industries (see page 10)

Additional marking of non-electrical equipment according to EN 13463-5

Spe

cific

sym

bol f

or e

xplo

sion

-pro

of:

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ctric

al e

quip

men

t [E

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f pro

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by E

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EN

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, 3, 4

, 6 a

nd 7

, E

N 1

3463

-5, E

N 1

3463

-8.

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Apparatus for potentially explosive atmospheresIDENTIFICATION IECEx

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 60079-1 (electrical apparatus / gas atmospheres)

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

Con

form

ity to

the

Eur

opea

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(Exa

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I : M

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: S

urfa

ce in

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ries

Cat

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: 1 (

zone

0)

- 2

(zo

ne 1

) -

3 (z

one

2)

Min

es :

M1

M2

Gas

: G

Du

sts

: D

Specific symbol for explosion-proof protection ac-cording to EN / IEC

TYPES OF PROTECTIONElectrical 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 61241-11Non-electrical apparatus:"c" : Protection by constructional safety EN 13463-5

0081q II 2 G Ex d IIC T4

0081q II 2 D Ex tD A21 IP67 T135°C

0081q II 2 D c T85°C T6

Ex d IIB Gb T6Ex t IIIC Db IP67 T85°C

ma or ia = for use in zone 0 gas (D = Dusts)

mb or ib = for use in zone 1 gas (D = Dusts)

Maximum surface

temperature

A = Prefix added to the zone (example: 21) to identify the test

method “A” (dust-tight enclosure, IP6X)

Temperature class

Enclosure ingress protection (IP) rating for dust (EN 60529)

Equipment groups(IIA, IIB, IIC,

IIIA, IIIB, IIIC)

Equipment Protection Level

(EPL)

R

LCIE 01 ATEX 6050X

0081II2D Ex tD A21 IP65II2G Ex d IIB+H2

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Apparatus for potentially explosive atmospheresTYPES 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

ZonesDescription Drawing

0 1 2

"d"

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"

Type of protection in which measures are applied so as to prevent with a higher degree of safety the possibility of excessive tem-peratures 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.

"i"

"ia" 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.

R L

CU"ib"

"ic"

"m"

"ma" 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 atmos-phere cannot be ignited by either sparking or heating which may occur within the encapsulation.

"mb"

"mc"

"n"

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 stand-ard. 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.

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.Please see our selection of products at: www.asconumatics.eu

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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

ZonesDescription Drawing

0 1 2

"tD"

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 endan-gered 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.

"mD"

maD 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.

mbD

"iD"

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 L

CU

TYPE OF PROTECTION FOR NON-ELECTRICAL APPARATUSEN 13463-5 = c

"c"

This standard establishes manufacturing requirements which have been proven safe, in order to avoid any inflam-mation 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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What are the types of protection derived from standard EN 60079-0 (EN 50014) for ASCO ?

Description CharacteristicsFLAMEPROOF ENCLOSURE

"d"

The most currently used type of protection.Standard equipment is contained in a sturdy casing specifically designed for use in explosive atmospheres.

CONSTRUCTIONStandard 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 seal1

cylindrical seal2

recessed seal3

L L

c

d

L = c + d

i

Features

- keeps an internal inflammation within a dimen-sionally 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.

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, TEMPERATUREEN 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 mainte-nance 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

"m"

Easy to install, the enclosure with this type of protection can be adapted to many models of electrical equipment.

CONSTRUCTIONStandard 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

- encloses in a compound the electrical parts which are likely to ignite the ambient explosive atmosphere;

- prevents ignition of the ambient explosive atmosphere. WIRING

By cable with 3 flying leads embedded in a compound. This airtight sealing prevents the ambient explosive atmosphere from penetrating the enclosure.

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Description CharacteristicsINTRINSIC SAFETY

"i"

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.

How?- 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.

Example of an intrinsically safe circuit:

WHAT IS EN 50020 BASED ON?(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 intrinsi-cally safe or not.

DEVICES FOR ELECTRICAL SUPPLYSafety barrierIt 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.

Non-hazardous zone Explosive zone

Reg.amplifier

Receiveror

sensorD1 D2

RvEEx i

U1+-

1 2

3

1 fuse2 Zener diodes3 zero potential (equi-

potential earth or interconnected earth)

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

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).

U2+

-

1 2 3 4 5

6

1 rectifier2 filter3 logic control4 galvanic protection

(transformer)5 output voltage

adjustment6 galvanic isolation

(optocoupler)

INCREASED SAFETY

"e"

Prevents the occurrence of any accidental ignition source: arcs or sparks. Sparking components are excluded from this method of protection.

How?- Use of high quality insulation materials;- Min. IP54 ingress protection to reduce the prob-

ability 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”.

CONNECTIONSecurely fastened certified cable gland always supplied mounted on the product.

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Apparatus for potentially explosive atmospheresEQUIPMENT GROUPS / TEMPERATURE CLASSES

CLASSIFICATION OF GASES INTO EXPLOSION GROUPSGroup 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 sup-plemented 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:

TEMPERATURE CLASSThe 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 sur-rounding explosive atmosphere.Group I : Temperature ≤ 150°C or ≤ 450°C according to coal dust accumulation on equipmentGroup 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).

Groups Gas Ignition temperature (1) (°C)Temperature class

T1 T2 T3 T4 T5 T6

I methane (firedamp)

II

A

acetone 540

acetic acide 485

ammonia 630

ethane 515

methylene chloride 556

methane (CH4) 537

carbon monoxyde 605

propane 470

n-butane 365

n-butyl 370

n-hexane 240

acetaldehyde 140

ethyl ether 160

ethyl nitrite 90

Bethylene 425

ethyl oxyde 429-440

hydrogen sulfide 270

Cacetylene (C2H2) 305

carbon disulphide (CS2) 102

hydrogen (H2) 560

(1) 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.

Temperature class Maximum surface temperature (°C) Ignition temperature (1) (°C)T1 450 > 450T2 300 > 300T3 200 > 200T4 135 > 135T5 100 > 100T6 85 > 85

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Apparatus for potentially explosive atmospheresEQUIPMENT 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.mConductive dust: Combustible dust with electrical resistivity equal to or less than 103 Ω.m

Combustible dust Ignition temperature (1) (°C)

Self-ignition temperature of dust layers (1) (°C)

Starch 440 290Aluminium 530 280Cotton 560 350Cereals 420 290Magnesium 610 410Soybean 500 245Sulphur 280 280Tabacco 450 300

(1) 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.

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8-05-14

Apparatus for potentially explosive atmospheresSTANDARDISATION ORGANISATIONS

IEC / CENELEC COOPERATION

The main CENELEC EN 50014 standard (General Requirements) pertaining to elec-trical 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 coopera-tion. 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 Organisa-tion (ISO), among others.

CENELEC

The "European Committee for Electrotechnical Standardisation" (CENELEC) is a tech-nical 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.

WHAT IS CEN?

CEN (European Committee for Standardisation) works in close partnership with CENELEC. CEN is a “European forum” for stand-ardisation, 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-electri-cal 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”.

- 2007: The significant changes in the 5th edition of IEC 60079-0 are:

- 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

CENELEC

IEC

Full partici-pationof all inte-restedparties

Nationalcommittees

Commissionof the European

communities

EuropeanFree TradeAssociation

ELECTROTECHNICALSTANDARDSfor EUROPE

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Apparatus for potentially explosive atmospheresCERTIFICATION

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.

Country ATEX IECEx Logo Notified bodiesN°

Belgium 26 AIB Vinçotte International S.A. - Bruxelles

Czech Republic 1026 FTZU Fyzikáln technický zkušební ústav (Physical Technical Testing Institute) - Radvanice

Denmark 539 UL/DEMKO Danmarks Elektriske Materielkontrol - Herlev

Finland 537 VTT VTT Industrial Systems (VTT Tuotteet ja Tuotanto) - VTT

France 80 INERIS Institut National de l’Environnement Industriel et des Risques - Verneuil-en-Halatte

81 LCIE Laboratoire Central des Industries Electriques - Fontenay-aux-Roses

Germany

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

EXAM Dekra EXAM

637 IBExU Institut für Sicherheitstechnik - Institut an der Technischen Universität - Bergakademie - Freiberg

820 ZELM EX Prüf-und Zertifizierungsstelle - Braunschweig

Hungary BKI Hungarian Approval Service for Ex-proof Electrical Equipment - Mikovuny

Italy 722 CESI Centro Eletrotecnico Sperimentale Italiano - Milano

Luxembourg 499 SNCH Société Nationale de Certification et d’Homologation - Sandweiler

Netherlands 344 KEMA KEMA Quality B.V. - Arnhem

Norway 470 NEMKO NEMKO AS - Oslo

575 DNV DET Norsk Veritas Certification - Hovik

Russia MANIO CCVE Certification Centre of explosion-proof and mine electrical equipment

Slovenia SIQ Slovenian Institute of Quality and Metrology - Ljubljana

Spain 163 LOM Laboratorio Oficial Jose Maria de Madariaga - Madrid

Sweden 402 SP Swedish National Testing and Research Institute LTD - Boras

Switzerland 1258 SEV Swiss Electrotechnical Association - Fehraltorf

United Kingdom

359 ITS Testing and Certification LTD - Leatherhead

518 SIRA Certification Service Sira Test & Certification Limited - Kent

600 EECS Electrical Equipment Certification Servicehealth and Safety Executive - Buxton

891 TRL Compliance Services LTD - Up Holland

1180 BASEEFA 2001 British Approval Service for Electrical Equipment in Flammable Atmospheres - Buxton

(2008)

What does this mean for the manufacturer?Obtaining the certificate:- gives proof of the conformity of equipment with the Certificate stan-

dards;- 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.

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8-05-16

Apparatus for potentially explosive atmospheresCENELEC STANDARDS

THE EUROPEAN STANDARDSThe 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

TYPES OF PROTECTIONtype «d» «e» «i» «m» «n» combustible dust «c»

CENELEC/CEN standards EN 60079-1 EN 60079-7 EN 50020 EN 60079-18

EN 50021 (EN 60079-15)

EN 61241-1 EN 13463-5

Member countries National standardsAustria ÖVE/ÖNORM EN 60079-1 ÖVE/ÖNORM EN 60079-7 ÖVE EN 50020 ÖVE/ÖNORMEN 60079-18 ÖVE/ÖNORM EN 50021 ÖVE/ÖNORM EN 61241-1 ÖVE ÖNORM EN 13463-5Belgium NBN-EN 60079-1 NBN EN 60079-7 NBN EN 50020 NBN EN 60079-18 NBN EN 50021 NBN EN 61241-1 NBN-EN 13463-5Bulgaria BDS EN 60079-1 BDS EN 60079-7 BDS EN 50020 BDS EN 60079-18 BDS EN 50021 BDS EN 61241-1 BDS 13463-5Croatia HRN EN 60079-1 HRN EN 60079-7 HRN EN 50020 HRN EN 60079-18 HRN EN 50021 HRN EN 61241-1 HRN EN 13463-5Cyprus CYS EN 60079-1 - - CYS EN 60079-18 CYS EN 50021 - -Czech Republic CSN EN 60079-1 CSN EN 60079-7 CSN EN 50020 CSN EN 60079-18 CSN EN 50021 CSN EN 61241-1 CSN EN 13463-5Denmark DS EN 60079-1 DS EN 60079-7 DS EN 50020 DS EN 60079-18 DS EN 50021 DS EN 61241-1 DS / EN 13463-5Estonia EVS EN 60079-1 EVS EN 60079-7 EVS EN 50020 EVS EN 60079-18 EVS EN 50021 EVS EN 61241-1 EVS- EN 13463-5Finland SFS-EN 60079-1 SFS-EN 60079-7 SFS EN 50020 SFS-EN 60079-18 SFS-EN 50021 SFS EN 61241-1 SFS-EN 13463-5France NF EN 60079-1 NF EN 60079-7 NF EN 50020 NF EN 60079-18 NF EN 50021 NF EN 61241-1 NF EN 13463-5Germany DIN EN 60079-1 DIN EN 60079-7 DIN EN 50020 DIN EN 60079-18 DIN EN 50021 DIN EN 61241-1 DIN EN 13463-5Greece EN 60079-1 EN 60079-7 NF EN 50020 EN 60079-18 ELOT EN 50021 ELOT EN 61241-1 ELOT EN 13463-5Hungary MSZ EN 60079-1 MSZ EN 60079-7 MSZ EN 50020 MSZ EN 60079-18 MSZ EN 50021 MSZ EN 61241-1 MSZ EN 13463-5Iceland IST EN 60079-1 IST EN 60079-7 IST EN 50020 IST EN 60079-18 IST EN 50021 IST EN 61241-1 IST EN 13463-5Ireland I.S. EN 60079-1 I.S. EN 60079-7 I.S./ EN 50020 I.S. EN 60079-18 I.S. EN 50021 I.S./ EN 61241-1 I.S. EN 13463-5Italy CEI EN 60079-1 CEI EN 60079-7 CEI EN 50020 CEI EN 60079-18 CEI EN 50021 CEI EN 61241-1 CEI EN 13463-5Latvia LVS EN 60079-1 LVS EN 60079-7 LVS EN 50020 LVS EN 60079-18 LVS EN 50021 LVS EN 61241-1 LVS EN 13463-5Lithuania LST EN 60079-1 LST EN 60079-7 LST EN 50020 LST EN 60079-18 LST EN 50021 LST EN 61241-1 LST EN 13463-5Luxembourg EN 60079-1 EN 60079-7 EN 50020 EN 60079-18 EN 50021 EN 61241-1 EN 13463-5Malta MSA EN 60079-1 MSA EN 60079-7 MSA EN 50020 MSA EN 60079-18 MSA EN 50021 MSA EN 61241-1 MSA EN 13463-5Netherlands NEN-EN 60079-1 NEN-EN 60079-7 NEN-EN 50020 NEN-EN 60079-18 NEN-EN 50021 NEN-EN 61241-1 NEN-EN 13463-5Norway NEK-EN 60079-1 NEK-EN 60079-7 NEK-EN 50020 NEK-EN 60079-18 NEK-EN 50021 NEK-EN 61241-1 NEK-EN 13463-5Poland PN-EN 60079-1 PN-EN 60079-7 PN-EN 50020 PN-EN 60079-18 PN-EN 50021 PN-EN 61241-1 PN EN 13463-5Portugal EN 60079-1 EN 60079-7 EN 50020 EN 60079-18 EN 50021 EN 61241-1 EN 13463-5Romania SR EN 60079-1 SR EN 60079-7 SR EN 50020 SR EN 60079-18 SR EN 50021 SR EN 61241-1 SR EN 13463-5Slovakia STN EN 60079-1 STN EN 60079-7 STN EN 60079-7 STN EN 60079-78 STN EN 50021 STN EN 61241-1 STN EN 13463-5Slovenia SIST EN 60079-1 SIST EN 60079-7 SIST EN 50020 SIST EN 60079-18 SIST EN 50021 SIST EN 61241-1 SIST EN 13463-5 Spain UNE EN 60079-1 UNE EN 60079-7 UNE EN 50020 UNE EN 60079-18 UNE EN 50021 UNE EN 61241-1 UNE-EN 13463-5Sweden SS EN 60079-1 SS EN 60079-7 SS EN 50020 SS EN 60079-18 SS EN 50021 SS EN 61241-1 SS EN 13463-5Switzerland SN EN 60079-1 SN EN 60079-7 SN EN 50020 SN EN 60079-18 SN EN 50021 SN EN 61241-1 SN EN 13463-5United Kingdom BS EN 60079-1 BS EN 60079-7 BS EN 50020 BS EN 60079-18 BS EN 50021 BS EN 61241-1 BS EN 13463-5Affiliated countriesBosnia & Herzegovina - - - - BAS EN 50021 - BAS EN 13463-5Turkey TS EN 60079-1 TS EN 60079-7 TS EN 50020 TS EN 60079-18 TS EN 50021 TS EN 61241-1 TS EN 13463-5

Member countriesNational standards

EN 50014 EN 60079-0Austria ÖVE EN 50014 ÖVE/ÖNORM EN 60079-0Belgium NBN-EN 50014 NBN-EN 60079-0Bulgaria BDS EN 50014 BDS EN 60079-0Croatia HRN EN 50014 HRN EN 60079-0Cyprus - CYS EN 60079-0Czech Republic CSN EN 50014 CSN EN 60079-0Denmark DS/EN 50014 DS/EN 60079-0Estonia EVS-EN 50014 EVS-EN60079-0Finland SFS-EN 50014 SFS-EN 60079-0France NF EN 50014 NF EN 60079-0Germany DIN EN 50014 DIN EN 60079-0Greece ELOT EN 50014 ELOT EN 60079-0Hungary MSZ EN 50014 MSZ EN 60079-0Iceland IST EN 50014 IST EN 60079-0Ireland I.S. EN 50014 I.S. EN 60079-0Italy CEI EN 50014 CEI EN 60079-0Latvia LVS EN 50014 LVS EN 60079-0Lithuania LST EN 50014 LST EN 60079-0Luxembourg EN 50014 EN 60079-0Malta MSA EN 50014 MSA EN 60079-0Netherlands NEN-EN 50 014 NEN-EN 60079-0Norway NEK EN 50 014 NEK EN 60079-0

Member countriesNational standards

EN 50014 EN 60079-0Poland PN-EN 50014 PN-EN 60079-0Portugal EN 50014 EN 60079-0Romania SR EN 50014 SR EN 60079-0Slovakia STN EN 50014 STN EN 60079-0Slovenia SIST EN 50014 SIST EN 60079-0Spain UNE EN 50014 UNE EN 60079-0Sweden SS EN 50014 SS-EN 60079-0Switzerland SN EN 50014 SN EN 60079-0United Kingdom BS EN 50014 BS EN 60079-0Affiliated countries EN 50014 EN 60079-0Albania - S SH EN 60079-0Belarus - -Bosnia & Herzegovina - -Former Youg. Rep. of Macedonia - -Israël - -Libya - -Montenegro - -Serbia - -Tunisia - -Turkey - TS EN 60079-0Ukraine - -

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PIC-8-05-17

Apparatus for potentially explosive atmospheresINTERNATIONAL STANDARDS

INTERNATIONAL TYPES OF PROTECTION

Zone Type of protectionApplicable certification

UL FM CSA IEC CENELEC

0Intrinsic 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 __ __

1

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

2

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)

INTERNATIONAL CLASSIFICATION OF ZONES

Standards Hazardous areas

IECCENELEC

Zone 0 (gas, vapours) or 20 (dust)

permanent, frequentor for a long period of time

Zone 1 (gas, vapours)or 21 (dust)intermittent

in normal operation (likely)

Zone 2 (gas, vapours)or 22 (dust)

occasional, or for short periods (never in normal operation)

USNEC 505 Zone 0 Zone 1 Zone 2

NEC 500 Division 1 Division 2

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 arelive on the IECEx Website. This enables full public access for viewing and printing. Visit the IECEx “On-LineCertificate” System.

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