7. IEC: Hazardous Area Standards

IEC: Hazardous Area Standards (The Global Concept of Industrial Safety)

HISTORY

On 15 September 1904, delegates to the International Electrical Congress, being held in St. Louis, USA, adopted a report that included the following words:
“…steps should be taken to secure the co-operation of the technical societies of the world, by the appointment of a representative Commission to consider the question of the standardization of the nomenclature and ratings of electrical apparatus and machinery.” (http://www.iec.ch/about/history/overview/)

As a result, the IEC was officially founded in June 1906, in London, England, where its Central Office was set up.

Technical Committee No. 31(established in JULY, 1948) is responsible for IEC 60079 Series of Standards & Specifications

The complete team consists of :-
1. Technical Committee : TC 31 Equipment for explosive atmospheres
2. Sub-Committee : SC 31 G Intrinsically-safe apparatus
3. Sub-Committee : SC 31 J Classification of Hazardous Areas and installation requirements
4. Sub-Committee : SC 31 M Non-electrical equipment and protective systems for explosive atmospheres

LIST Of IEC STANDARDS – SERIES IEC 60079

ISO IEC80079-36

Explosive atmospheres Part 36: Non-electrical equipment for explosive atmospheres– Basic method and requirements

ISO IEC80079-37

Explosive atmospheres — Part 37: Non-electrical equipment for explosive atmospheres —

Non-electrical type of protection:-

constructional safety ”c”
control of ignition sources ”b”
liquid immersion ”k’

(TC31) IEC 60079-0:2017

IEC 60079-0:2017 specifies the general requirements for construction, testing and marking of Ex Equipment and Ex Components intended for use in explosive atmospheres. The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that Ex Equipment can be operated are:
–temperature –20 °C to +60 °C;
-pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and
-air with normal oxygen content, typically 21 % v/v.
This part of IEC 60079 and other standards supplementing this standard specify additional test requirements for Ex Equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for Ex Equipment operating outside the standard atmospheric pressure range and standard oxygen content. Such additional testing may be particularly relevant with respect to Types of Protection that depend on quenching of a flame such as ‘flameproof enclosures “d”’ (IEC 60079-1) or limitation of energy, ‘intrinsic safety “i”’ (IEC 60079-11). This seventh edition cancels and replaces the sixth edition, published in 2011. This edition constitutes a technical revision. (https://webstore.iec.ch/publication/32878)
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(TC31) IEC 60079-1 Edition 7.0 2014

New edition
IEC 60079-1:2014 contains specific requirements for the construction and testing of electrical equipment with the type of protection flameproof enclosure “d”, intended for use in explosive gas atmospheres. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard will take precedence. This seventh edition cancels and replaces the sixth edition, published in 2007, and constitutes a technical revision. The numerous changes are identified in the Forward of the document.
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(TC31) IEC 60079-2 Edition 6.0

NEW Edition IEC 60079-2:2014
IEC 60079-2:2014 contains the specific requirements for the construction and testing of electrical equipment with pressurized enclosures, of type of protection “p”, intended for use in explosive gas atmospheres or explosive dust atmospheres.
This sixth edition cancels and replaces the fifth edition published in 2007. This sixth edition cancels and replaces the first edition of IEC 61241-4 published in 2001. This sixth edition constitutes a technical revision. The significance of changes between IEC 60079-2, Edition 6.0, 2014 and IEC 60079-2, Edition 5.0, 2007 are as listed in the foreword of the document.

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(TC31) IEC 60079-5 Edition 4.0

New Edition IEC 60079-2015
IEC 60079-5:2015 contains specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components in the type of protection powder filling “q”, intended for use in explosive gas atmospheres. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This standard applies to electrical equipment, parts of electrical equipment and Ex components with:
– a rated supply current less than or equal to 16 A;
– a rated supply voltage less than or equal to 1 000 V;
– a rated power consumption less than or equal to 1 000 W.

This fourth edition cancels and replaces the third edition, published in 2007, and constitutes a technical revision. Refer to the Foreword of the document for a complete listing of the technical changes between edition 4.0 and previous edition of the document. Keywords: electrical equipment and Ex components in the type of protection powder filling “q” .

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(TC31) IEC 60079-6 Edition 4.0 4

New Edition IEC 60079-6
IEC 60079-6:2015 specifies the requirements for the design, construction, testing and marking of Ex Equipment and Ex Components with type of protection liquid immersion “o” intended for use in explosive gas atmospheres. Ex Equipment and Ex Components of type of protection liquid immersion “o” are either:
– Level of Protection “ob” (EPL “Mb” or “Gb”) or
– Level of Protection “oc” (EPL “Gc”).
For Level of Protection “ob”, this standard applies where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. For Level of Protection “oc”, this standard applies where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
This fourth edition cancels and replaces the third edition, published in 2007. This edition constitutes a technical revision. The significant changes with respect to the previous edition are:
– Edition 4 represents a major technical revision of the requirements for oil immersion “o” and should be considered as introducing all new requirements. The normal “Table of Significant Changes” has not been included for this reason. In particular:
– The requirements for oil immersion “o” have been redefined into liquid immersion, levels of protection “ob” and “oc” as recommended by the responses to 31/715/DC;
– The ability to protect sparking contacts has been added to both “ob” and “oc”. Additional requirements have been introduced for the protective liquid

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(TC31) IEC 60079-7 Edition 5 (2015-06-26)
IEC 60079-7:2015(E) specifies the requirements for the design, construction, testing and marking of electrical equipment and Ex Components with type of protection increased safety “e” intended for use in explosive gas atmospheres. Electrical equipment and Ex Components of type of protection increased safety “e” are either:

– Level of Protection “eb” (EPL “Mb” or “Gb”);
– or Level of Protection “ec” (EPL “Gc”).

Level of Protection “eb” applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; but not including semiconductors or electrolytic capacitors.

Level of Protection “ec” applies to equipment or Ex Components, including their connections, conductors, windings, lamps, and batteries; and also including semiconductors and electrolytic capacitors. ……..(Abstract from IEC)

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(SC 31 J ) IEC 60079-10-1 Edition 2.0 (09.2015)
Explosive atmospheres – Part 10-1: Classification of areas – Explosive
gas atmospheres

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(SC 31 J ) IEC 60079-10-2 Edition 2.0 (01.2015)
Explosive atmospheres – Part 10-2: Classification of areas – Explosive
dust atmospheres

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SC 31 G IEC 60079-11 Edition 6.0 (2011-06-30)
Explosive atmospheres – Part 11: Equipment protection by intrinsic safety “i”
Last Update Edition 6.0 (2012-01-27)
Corrigendum 1 – Explosive atmospheres – Part 11: Equipment protection by intrinsic safety “i”

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TC31 IEC 60079-13 Edition 1.0 (2010-10-05)
Explosive atmospheres – Part 13: Equipment protection by Pressurized
Room “p”
This part of IEC 60079, gives the requirements for the Design, Construction, Assessment, Testing and Marking of ROOMS protected by Pressurization in a :- • A room located in an explosive gas atmosphere or explosive dust atmosphere hazardous area that does not include an internal source of a
flammable substance.•
A room located in an explosive gas atmosphere or explosive dust atmosphere hazardous area that includes an internal source of a flammable substance.• A room located in a non-hazardous area that includes an internal source of a flammable substance(Applicable to non-ventilated rooms only)

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SC 31 J IEC 60079-14 Edition 5.0 (2013-11)
Explosive atmospheres – Part 14: Electrical installations design, selection
and erection

This part of the IEC 60079 series contains the specific requirements for the :

design

selection,
erection

and initial inspection of electrical installations in, or associated with, explosive
atmospheres.

The requirements of this standard apply only to the use of equipment under standard
atmospheric conditions as defined in IEC 60079-0. For other conditions, additional
precautions may be necessary, and the equipment should be certified for these other
conditions.

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TC31 IEC 60079-15 Edition 4.0 (2010-01-28)
Explosive atmospheres – Part 15: Equipment protection by type of
protection ‘n’
This part of IEC specifies the requirement for the Construction, Testing and Marking for GROUP II electrical equipment with type of protection [ n]
, intended for use in Explosive Gas Atmosphere. Some of the Salient features of this addition: •
Removal of energy-limited [nL ]
and associated energy limited apparatus [nL].
• Removal of the requirements for Encapsulated Devices [nC]

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TC31 IEC/TR 60079-16 Edition 1.0 (1990-05-15) -Technical Report
Electrical apparatus for explosive gas atmospheres. Part 16: Artificial
ventilation for the protection of analyzer (s) houses.

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SC 31 J IEC 60079-17 Edition 5.0 (2013-November)
Explosive atmospheres – Part 17: Electrical installations inspection and
maintenance

This part of the IEC 60079 series applies to users and covers factors directly related to the
inspection and maintenance of electrical installations within hazardous areas only, where the
hazard may be caused by flammable gases, vapors, mists, dusts, fibers or flyings.

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TC31 IEC 60079-18 Edition 4.0

New Edition
IEC 60079-18:2014 gives the specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components with the type of protection encapsulation “m” intended for use in explosive gas atmospheres or explosive dust atmospheres.
This part applies only for encapsulated electrical equipment, encapsulated parts of electrical equipment and encapsulated Ex components (hereinafter always referred to as “m” equipment) where the rated voltage does not exceed 11 kV.
The application of electrical equipment in atmospheres, which may contain explosive gas as well as combustible dust simultaneously, may require additional protective measures. This standard does not apply to dusts of explosives, which do not require atmospheric oxygen for combustion, or to pyrophoric substances.
This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.
This fourth edition cancels and replaces the third edition of IEC 60079-18:2009, and constitutes a technical revision.

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SC 31 J IEC 60079-19 Edition 3.0 (2010-11-29)
Explosive atmospheres – Part 19: Equipment repair, overhaul and
reclamation

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SC 31 M IEC 60079-20-1 Edition 1.0 (2010-01-21)
Explosive atmospheres – Part 20-1: Material characteristics for gas and
vapour classification – Test methods and data
Last Update Edition 1.0 (2012-07-13)Corrigendum 1 – Explosive atmospheres – Part
20-1: Material characteristics for gas and vapour classification – Test
methods and data

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SC 31 G IEC 60079-25 Edition 2.0 (2010-02-24)
Explosive atmospheres – Part 25: Intrinsically safe electrical systems

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TC31 IEC 60079-26 Edition 3.0

New Edition IEC 60079-26

IEC 60079-26:2014 specifies alternative requirements for construction, test and marking for electrical equipment that provides Equipment Protection Level (EPL) Ga when single standardised Types of Protection (e.g. Ex “ia”, Ex “ma”, Ex “da”) cannot be applied.

This standard also applies to equipment mounted across a boundary where different Equipment Protection Levels may be required. This electrical equipment, within the operational parameters specified by the manufacturer, ensures a very high Level of Protection that includes rare malfunctions related to the equipment or two malfunctions occurring independently of each other. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.

This third edition cancels and replaces the second edition published in 2006 and constitutes a technical revision.

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TC31 IEC 60079-28 Edition 2.0 (27.05.2015)
IEC 60079-28:2015 specifies the requirements, testing and marking of equipment emitting optical radiation intended for use in explosive atmospheres. It also covers equipment located outside the explosive atmosphere or protected by a Type of Protection listed in IEC 60079-0, but which generates optical radiation that is intended to enter an explosive atmosphere. It covers Groups I, II and III, and EPLs Ga, Gb, Gc, Da, Db, Dc, Ma and Mb. This standard does not cover ignition by ultraviolet radiation and by absorption of the radiation in the explosive mixture itself. Explosive absorbers or absorbers that contain their own oxidizer as well as catalytic absorbers are also outside the scope of this standard. This second edition cancels and replaces the first edition, published in 2006.

(Abstract from IEC)

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TC31 IEC 60079-29-1 Edition 1.0 (2007-08-09)
Explosive atmospheres – Part 29-1: Gas detectors – Performance
requirements of detectors for flammable gases. General requirements for the construction, testing and performance of Portable, Transportable and
Fixed apparatus for the Detection and measurement of Flammable Gas or Vapours concentrations in air.For above-surface facilities and Mines.
Last Update Edition 1.0 (2009-07-16)
Interpretation sheet 1 – Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of detectors for flammable gases

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TC31 IEC 60079-29-2 Edition 1.0 (2007-08-16)
Explosive atmospheres – Part 29-2: Gas detectors – Selection,
installation, use and maintenance of detectors for flammable gases and
oxygen.

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TC31 IEC 60079-29-3 Edition 1. 0 (27-03-2014)
Explosive atmospheres – Part 29-3: Gas detectors – Guidance on
functional safety of fixed gas detection systems
IEC 60079-29-3:2014 gives guidance for the design and implementation
of a fixed gas detection system, including associated and/or peripheral
gas detection equipment, for the detection of flammable gases/vapours
and oxygen when used in a safety-related application in accordance with
IEC 61508 and IEC 61511. This International standard also applies to the
detection of toxic gases

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TC31 IEC 60079-29-4 Edition 1.0 (2009-11-10)
Explosive atmospheres – Part 29-4: Gas detectors – Performance
requirements of open path detectors for flammable gases
IEC 60079-29-4:2009 specifies performance requirements of equipment
for the detection and measuring of flammable gases or vapours in
ambient air by measuring the spectral absorption by the gases or
vapours over extended optical paths, ranging typically from one meter to
a few kilometers. Such equipment measures the integral concentration of
the absorbing gas over the optical path in units such as LFL meter for
flammable gases
Up Dated Edition 1.0 (2010-08-10)
Corrigendum 1 – Explosive atmospheres – Part 29-4: Gas detectors –
Performance requirements of open path detectors for flammable gases

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TC31 IEC 60079-30-1 Edition 1.0 (2007-01-18)
Explosive atmospheres – Part 30-1: Electrical resistance trace heating –
General and testing requirements

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TC31 IEC 60079-30-2 Edition 1.0 (2007-01-18)
Explosive atmospheres – Part 30-2: Electrical resistance trace heating –
Application guide for design, installation and maintenance

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TC31 IEC 60079-31 Edition 2.0 (2013-11-27)
Explosive atmospheres – Part 31: Equipment dust ignition protection by
enclosure “t”
IEC 60079-31:2013 is applicable to electrical equipment protected by
enclosure and surface temperature limitation for use in explosive dust
atmospheres. It specifies requirements for design, construction and
testing of electrical equipment and Ex Components. This standard
supplements and modifies the general requirements of IEC 60079-0.
Not applicable to Mines & Explosives

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TC31 IEC/TS 60079-32-1 Edition 1.0 (2013-08-20)
Explosive atmospheres – Part 32-1: Electrostatic hazards, guidanceIEC/TS
60079-32-1:2013(E) gives guidance about the equipment, product and
process properties necessary to avoid ignition and electrostatic shock
hazards arising from static electricity as well as the operational
requirements needed to ensure safe use of the equipment, product or
process.. The purpose of this document is to provide standard
recommendations for the control of static electricity, such as
GROUNDING of conductors, reduction of charging and restriction of
chargeable areas of insulators.

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TC31 IEC 60079-33 Edition 1.0 (2012-09-27)
Explosive atmospheres – Part 33: Equipment protection by special
protection ‘s’This interesting part of IEC 60079 applies to electrical
equipment employing a method of ( Ex) protection NOT covered by any
existing standards in the IEC 60079 series

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SC 31 M ISO/IEC 80079-34 Edition 1.0 (2011-04-20)
Explosive atmospheres – Part 34: Application of quality systems for
equipment manufacture

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TC31 IEC 60079-35-1 Edition 1.0 (2011-05-26)
Explosive atmospheres – Part 35-1: Cap-lights for use in mines
susceptible to firedamp – General requirements – Construction and
testing in relation to the risk of explosion

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TC31 IEC 60079-35-2 Edition 1.0 (2011-12-07)
Explosive atmospheres – Part 35-2: Cap-lights for use in mines
susceptible to firedamp – Performance and other safety-related matters

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TC31 IEC 61241-2-1 Edition 1.0 (1994-12-21) Combustible Dust
Electrical apparatus for use in the presence of combustible dust – Part 2:
Test methods – Section 1: Methods for determining the minimum ignition
temperatures of dust

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TC31 IEC/TS 61241-2-2 Edition 1.0 (1993-08-24) Combustible Dust
Electrical apparatus for use in the presence of combustible dust – Part 2:
Test methods – Section 2: Method for determining the electrical resistivity
of dust in layers

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