AS/NZS (IEC , Ed. , MOD). Australian/New Zealand Standard. Explosive atmospheres. Part Design. You may be required to comply with this standard if you intend to undertake electrical work in areas where flammable gas or vapour risks may arise. Where. Looking for advice on AS-NZS & other AS-NZS certification standards? Contact E-x Solutions on (08) to speak to one of our experts today.
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Search the history of over billion web pages on the Internet. Magna Carta— Tutohinga Nui Kore rawa e hoko ki te tangata, e kore e whakakdihoretia, e tautuku ranei te tangata ki te ture, tika ranei. Electrical installations design, selection and erection I ECEd. This Standard was published on 1 8 September The following are represented on Committee EL To maintain their currency, all Standards are periodically reviewed, and new editions are published.
Between editions, amendments may be issued. Standards may also nss withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. Nnzs more frequent listings or notification of revisions, amendments and withdrawals, Standards Australia and Standards New Zealand offer a number of update options.
For information about these services, users should contact their respective national Standards organization. We also welcome suggestions for improvement in our Standards, and especially encourage 60709 to notify us immediately of any apparent inaccuracies or ambiguities.
Please address your comments to the Chief Executive of either Standards Australia or Standards New Zealand at the address shown on the back cover. This Standard was issued in draft form for comment as DR Electrical installations design, selection and erection lECEd.
No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.
The objective of this Standard is to set out the requirements for the design, selection and erection of electrical installations in 60097 areas associated with explosive atmospheres; these requirements are in addition to the requirements for electrical installations in non- hazardous areas. This Standard is an adoption with national modifications and has been reproduced from lECEd.
Electrical installations design, selection and erection. Variations to lECEd. Where text, tables or figures are added, each is set in its proper place and identified by shading example. Added figures are not themselves shaded, but are identified by a shaded border. The adoption of this Standard fbrms part of the strategic objective established by Standards Australia and Standards New Zealand for adoption of all 6009 the lEC series. The change to the lEC based Standard introduces changes in both technical content and presentation.
Significant technical changes included in this Standard, with respect to the previous lEC edition are as follows: Dust requirements are incUjded as an interim presentation fbr the purpose of this edition and will be refined in a next edition with other required technical changes. As this Standard is reproduced from an International Standard, the following applies: The terms ‘normative’ and ‘informative’ are used to define the application of the annex to which they apply.
A normative annex is an integral part of a Standard, whereas an informative annex is only for information and guidance.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
Mitigation Substitution involves, for example, replacing a flammable material by one which is either not flammable or less flammable. Control involves, for example: NOTE 1 With sa exception of item fail of the above are part ws the process of hazardous area classification.
Mitigation involves, for example: NOTE 2 The above items are part of consequence management when considering risk. Such classification, which may be used in conjunction with an assessment of the consequences of an ignition, allows equipment protection levels to be determined and hence appropriate types of protection to be specified for each location. For an explosion to occur, an explosive atmosphere and a source of ignition need to co-exist.
Protective measures aim to reduce, to an acceptable level, the likelihood that the electrical installation could become a source of ignition. By careful design of the electrical installation, it is frequently possible to locate much of the electrical equipment in less hazardous or non-hazardous areas. When electrical equipment is to be installed in areas where dangerous concentrations and quantities of flammable gases, vapours, mists or dusts may be present in the atmosphere, protective measures are applied to reduce the likelihood of explosion due to ignition by arcs, sparks or hot surfaces, produced either in normal operation or under specified fault conditions.
VII Many types of dust that are generated, processed, handled and stored, are combustible. When ignited they can burn rapidly and with considerable explosive force if mixed with air in the appropriate proportions.
It is often necessary to use electrical eqiilpment apparatus in locations where such combustible materials are present, and suitable precautions must therefore be taken to ensure that all such egiripment appar a tus is adequately protected so as to reduce the likelihood of ignition of the external explosive atmosphere. In electrical equipment apparatuspotential ignition sources include electrical arcs and sparks, hot surfaces and frictional sparks.
Areas where dust, flyings and fibres in air occur in dangerous quantities are classified as hazardous and are divided into three zones according to the level of risk.
Combustible dust can be ignited by equipment in several ways: In order to avoid dust ignition hazards it is necessary that: IEC -and this Standard gives the specific requirements for design, selection and erection of electrical installations in explosive atmospheres.
In any industrial installation, irrespective of size, there may be numerous sources of ignition apart from those associated with electrical equipment. Precautions may be necessary to ensure safety from other possible ignition sources, but guidance on this aspect is outside the scope of this Standard. They adopt different methodology with the primary differences being: Where the equipment is required to meet other environmental conditions, for example, protection against ingress of water and resistance to corrosion, additional methods of protection may be necessary.
The method used 5: The requirements of this Standard apply only to the use of equipment under normal or near normal atmospheric conditions. For other conditions, additional precautions may be necessary. For example, most flammable materials and many materials which are normally regarded as non-flammable might burn vigorously under conditions of oxygen enrichment.
Other precautions might also be necessary in the use of equipment 660079 conditions of extreme temperature and pressure. Such precautions are beyond the scope of this Standard. This Standard applies to all electrical equipment including fixed, portable, transportable and personal, and installations, permanent or temporary. It applies to installations at all voltages. NOTE; For furthier inforrnation, refet For dated references, ax the edition cited applies.
For undated references, the latest edition of the referenced document including any amendments applies. El e ctrical installations AS: Eloctrical installations in hazardous a r o as oth e r tfi a n min e s iEC – 15, El e ctrical apparatus for explosiv e gas atmosph e res Part Artificial ventilation for the protection of analyzer s houses I ECNss e ctrical apparatus for e xplosiv e gas atmosph e r e s P a rt Equipment repair, overhaul and reclamation IEC 25, Nza e ctrical apparatus 60709 e xplosiv e gas atmosph e res – Part Intrinsically s a f e systems Ai!
I EC 26, Explosiv e atmosph e r e s — Port Tests at power frequencies lECTests on electric and optical cables under fire conditions – Part T e st m e thods — Section 1: I ECIndustrial process control – Safety of analyser houses lEC 06079, Safety of power transformers, power supply units and similar – Part Nas details see 5.
NOTE 2 Additionally, the requirennents of the equipnnent standard are intended to ensure that a fault capable of causing ignition is not likely to occur. NOTE 3 An exannple of a specified abnornnal condition is a luminaire with a failed lamp. However, due to the snnall free volunnes in nsz filling nnaterial and due 600079 the quenching of a flanne which may propagate through the paths in the filling materialman external explosion is prevented. Electrical equipment should, as far as xs reasonably practicable, be located in non-hazardous areas.
Where it is not possible to do this, it should be located in an area with the lowest requirements. However th e r e quir e m e nts for non – haz a rdous areas ar e i nsuffic ie nt for inst alla t i ons i n h a z a rdous ae e as.
Electrical equipment and materials shall be installed and used within their electrical ratings for power, voltage, current, frequency, duty and such other characteristics where non-conformity might jeopardize the safety of the installation. In particular, care shall be taken to ensure that the voltage and frequency are appropriate to the supply system with which the equipment is used and that the temperature classification has been established for the correct voltage, frequency and other parameters.
All electrical equipment and wiring in hazardous areas shall be selected and installed in accordance with C l aus e s 5 to 9 inclusive and the additional requirements for the particular type of protection C nzz us e s 10 to Equipment shall be installed in accordance with its documentation. It shall be ensured that replaceable items are of the correct type and rating. To achieve this result, a verification dossier shall be prepared for every installation and shall be either kept on the premises or stored in another location.
In the latter case, a document shall be left on the premises indicating who the owner nz owners are and where that information is kept, so that when required, copies may be obtained.
In order to correctly install or extend an existing installation, the following information, additional to that required for non-hazardous areas, is required, where applicable: Additional requirements in the case of dust: NOTE The mzs dossier may be kept as hard copy or in electronic form.
Methods accepted by legislation-m- e ach country may vary the form in which the documentation will be legally accepted. Itghall bg t e: NOTE 2 In the situation where equipment is dual certified e.
AS-NZS 60079 & Other AS-NZS Standards
Different protection concepts have different maintenance requirements. In the above example: The connpetency nzz the person shall be relevant to the type of work to be undertaken s ee Ann e x F. Appropriate continuing education or training shall be undertaken by personnel on a regular basis. Zoning does not take account of the potential consequences az an explosion.
NOTE The previous editions of this Standard allocated protection concepts to zones, on the statistical basis that the more frequent the occurrence of an explosive atmosphere, the greater the level of safety required against the possibility of an ignition source.
Where Certified f ;;: Where equipment meeting the requirements of EPL ‘Ga’,or Gb’ and ‘Da’ or ‘Db’ respectively is installed in a location 6079 only requires equipment to EPL ‘Gc’ or ‘Dc’ it shall be installed in full accordance with the requirements of all the types of protection employed except as varied by the additional requirements for the individual protection techniques.