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  • Certificate

    ISO 9001:2008
  • Certificate

    IEC 80079-34:2011

Area Classification

Area classification is the division of a facility into three-dimensional hazardous areas and non-hazardous areas
and the subdivision of the hazardous area into ‘Zones’.

 

Hazardous areas may be sud-divided into three Zones as follows:

                                                                Flammable gases and vapour’s

Zone 0:An area in which an explosive atmosphere is constantly present, or present for long periods.
(Rough Guide : More than 1,000 hours / year)

 

Zone 1:An area in which an explosive atmosphere is likely to occur in normal operation.
(Rough Guide : 10 hours or more / year but less than 1,000 hours / year)

 

Zone 2:An area in which an explosive atmosphere is not likely to occur in normal operation and if it
occurs, it will exist only for a short time.(Rough Guide : Less than 10 hours / year)

 

Combustible Dusts

 

Zone 20:An area in which combustible dust, as a cloud, is present continuously or frequently,
during normal operation, in sufficient quantity to be capable of producing an explosive
concentration of combustible dust in a mixture with air.

 

Zone 21 :An area, in which combustible dust, as a cloud, is occasionally present during normal
operation, in sufficient quantity to be capable’ of producing an explosive concentration
of combustible dust in a mixture with air.

 

Zone 22:An area, in which combustible dust, as a cloud, may occur infrequently and persist for
only a short period, or in which accumulations of layers of combustible dust may give
rise to an explosive concentration of combustible dust in a mixture with air.

 

Apparatus selection according to the ignition temperature of gas or vapour

The equipment must be selected so that its maximum surface temperature will not reach the ignition
temperature of any gas or vapour that may be present.

 

 

 

Temperature class of

electrical apparatus

Maximum surface temperature of

 electrical apparatus

Ignition temperature of

gas or vapour

            T1

                  450 C

           >450 C

            T2

                  300 C

           >300 C

            T3

                  200 C

            >200 C

            T4

                  135 C

            >135 C

            T5

                  100 C

            > 100 C

            T6

                   85 C

            > 85 C

 

 

If the marking of the electrical apparatus does not include an ambient temperature range, the
apparatus is only for use within an ambient temperature range from -20 C to 40 C..
For further information regarding data for flammable gases and vapour’s, see PD IEC 60079-20.

 

 Apparatus Construction Standards

 

 

 

                    CENELEC

                      IEC

EN 50014     -  General Requirements

IEC 60079-0     -  General Requirements

EN 50015     -  Oil Immersion ‘o’

IEC 60079-6     -  Oil Immersion ‘o’

EN 50016     -  pressurization ‘p

IEC 60079-2     -  pressurization ‘p’

EN 50017     -  Powder Filling ‘q’

IEC 60079-5     -  Powder Filling ‘q’

EN 50018     -  Flameproof Enclosure ‘d

IEC 60079-1     -  Flameproof Enclosure ‘d’

EN 50019     -  Incrcascd Safcty ‘e’

IEC 60079-7     -  Increased Safety ‘e

EN 50020     -  Intrinsic Safcty ‘

IEC 60079-11    -  Increased Safety ‘i’

EN 50021     -  Electrical Apparatus type ‘n’

IEC 60079-15    -  Electrical Apparatus type ‘n’

EN 50028     -  Encapsulation ‘m’

IEC 60079-18   -  Encapsulation ‘m’

 

 

 

Installation Standards and Codes 

 

There are numerous different regulations, codes, guidelines and standards for the design, installation and

Maintenance of electrical and non-electrical systems for use in potentially explosive atmospheres. The type of

Operational facility, geographic location, operator practice, local and national legislation authority, having

Jurisdiction etc. will determine many of the design and installation rules permitted.

 

 

For further information on the design, selection and installation of equipment for use in hazardous areas see:-

 

IEC 60079-14     -  Electrical installation in hazardous areas (other than mines)

 

IEC 61892-7     -  Mobile and fixed offshore units - Electrical installation, part 7: Hazardous areas

 

 

IEC 612141-1-2     -  (proposed change to IEC 61241-14) - Electrical apparatus in the presence of combustible

dust.

 

Part 1-2 : Electrical apparatus protected by enclosures and surface temperature

 

EN 60079-14-    Electrical installations in hazardous areas  ( other than mines )

 

EN 50281-1-2 -  Electrical apparatus for use in the presence of combustible dust - part 1 - 2

 

Electrical apparatus protected by enclosures - selection, installation and maintenance.

 

 

 

Inspection Standards and Codes

 

For information regarding the installation and maintenance of equipment for use in hazardous areas see:

 

IEC 60079-17  - Inspection and maintenance of electrical installations in hazardous areas ( other than mines )

 

 

IEC 61241-17  - Electrical apparatus for use in the presence of combustible dust atmosphere - part 17 :

Inspection And maintenance.

 

 

 

 ATEX 94/9/EC Directive

 

The Directive classifies equipment into eight categories dependingon the equipment’s area of use:

Category M1 :Equipment intended for mining use and is required to remain functional in the presence of an
explosive atmosphere.

 

Category M2 :Equipment intended for mining use but is intended to be de-energised in the event of an
explosive atmosphere.

 

Category 1G :Non-mining equipment for use in Zone 0

 

Category 2G :Non-mining equipment for use in Zone 1

 

Category 3G :Non-mining equipment for use in Zone 2

 

Category 1D:Non-mining equipment for use in Zone 20

 

Category 2D:Non-mining equipment for use in Zone 21

 

Category 2D:Non-mining equipment for use in Zone 22

 

 

ATEX 137 Directive 99/92/EC

 

The Directive covers the use of equipment in potentially explosive atmospheres and its aim is to
establish minimum requirements for improving the safety and health of workers.

Article 137 of Directive 89/391/EC was published in the official journal of the EC on 28th
January 2000 as Directive 99/92/EC, it is the 15th individual Directive of the framework
Directive 89/391/EEC.

 

 

The article defines the:-

 

Obligations of the employees re. the prevention and protection against explosions.

Assessment obligations re. the assessment of explosion risks.

General obligations re. the safety and health of worker.

Requirements for explosion protection documents.

 

 

In places where potentially explosive atmospheres may occur in such quantities as to endanger the health and safety of workers, the point of entry must be marked with the sign shown below in
accordance with Section II, Article 7 of the Directive.