Information regarding explosion protection by cty88181


									                                Information regarding
                                 explosion protection             Date: 02.07.08

                    ATEX-Guideline (Atmospheres Explosibles)

It is the aim of explosion protection to create technical processes and equipment in
such a way that the remaining risk of explosion is justifiably low when handling
combustible substances being mixed with oxidants and materials of self-
disintegrating behaviour.

  The Guideline 94/9/EEC of Explosion protection (called ATEX 100a as well) is
      applied to equipment and protective systems for purpose-intended use in
                                explosive areas.

Within the European Community the adherence to the Ex-guidelines is regulated by

A difference is made between:

94/9/EEC (ATEX 100a) regulates all rules regarding the properties of explosion-proof

1999/92/EEC (ATEX 137 former ATEX 118a) regulates the safety of employees who
may be particularly endangered by potentially explosive atmospheres.


From 01.07.2003 the application of the Explosion Protection Guideline (94/9/EEC)
has been binding. Prior to this date, it was possible to import equipment and
electrical plants built according to the former law (ElexV-old) into the European trade


The Guideline 94/9/EEC concerns the manufacturer and comprises not only the
electrical equipment but also non-electrical devices. It regulates the placement of
equipment and machines into circulation of goods. The devices and machines are
classified in two categories.

Category      is defining the degree of safeguarding in case of a breakdown caused
              by operation fault of equipment.
              The devices used must comply with the demands and must own
               appropriate certificates.

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                                    Information regarding
                                     explosion protection          Date: 02.07.08

Electrical plants in explosive areas are regulated by the Guideline ElexV-new
(BGBI Jg.1996T1 No. 65 dated 19 December 1996). This regulation just concerns
the operation of electrical plants in EEX-areas only.

From 30.06.2003 it has been allowed to place to the circulation of goods only such
devices and protection systems or electrical plants featuring a CE conformity marking
intended for use in explosive areas.

Any classification in zones is not provided in the Guideline 94/9/EEC. It only
determines the demands of utilities and the corresponding category.

Classification of utilities in Ex-areas

according to              gases, vapours, mist / dust   Evaluation method of
94/9/EEC                                                conformity according to
Category 1                Zone 0 / Zone 20              EEC type approval as per
(very high degree of                                    appendix III
safety                                                  (quality assurance of
                                                        production as per appendix IV
                                                        or examination of the products
                                                        as per appendix V)
Category 2                Zone 1 / Zone 21              EEC type approval as per
(high degree of safety)                                 appendix III
                                                        (quality assurance of
                                                        production as per appendix VII
                                                        or conformity to type of
                                                        construction as per appendix

                                                        Relating to all non-electrical
                                                        devices: in-house inspection
                                                        of production (appendix VIII),
                                                        placing the documents at the
                                                        disposal of an independent

Category 3                Zone 2 / Zone 22              In-house inspection by the
(normal degree of                                       manufacturers themselves as
safety )                                                per appendix VIII.

Constructive considerations to avoid any ignition sources

1.      Find out the cause of risk of ignition (EN 1127-1, Appendix II of the Guideline).

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                                 Information regarding
                                  explosion protection          Date: 02.07.08

2.    Determine the applicable standards (mainly harmonized standards)
3.    Derive solutions from these standards to avoid any risks of ignition and of
      ignition sources.

Identification as per 94/9/EEC

The identification mark must comprise the following data:

Name and address of manufacturer
CE conformity marking
Machine type
Machine no.
Year of construction
EEX marking
Identification according to standard, e.g. c/b IIA T4

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