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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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Nationa l or other standards should be followe d for conduit syst e ms. International Involvement Standards Australia and Standards New Zealand are responsible for ensuring that the Australian and New Zealand viewpoints are considered in the formulation of international Standards and that the latest international experience is incorporated in national and Joint Standards.

Low pressure sodium vapour discharge lamps shall not be installed above a hazardous area. In addition, cable insulation shall have suitable water resistance. 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: The materials used for the ducts and connecting parts shall not be adversely affected by the specified protective gas nor by the flammable gas or vapours in which they are to be used.

The voltage tests shall be carried out by a method specified in an appropriate cable standard. Electrical equipment for explosive atmospheres lECTests on electric and optical fibre cables under fire conditions – Part Hazardous areas with the normal exception of coal mining are divided into zones, according to the degree of hazard.

For explosive dust atmospheres the present system of marking the zones on equipment is being replaced by marking the EPLs. The effectiveness of the temperature control shall take into account power, speed range, torque and frequency for the duty required and shall be verified and documented. Precautions shall be taken to prevent operation of multi-phase electrical equipment e.

AS-NZS 60079-14: Explosive atmospheres – Electrical installations design, selection and erection

Similarly cables with non filled interstices or with hygroscopic fillers eg. Associated apparatus with galvanic isolation between the intrinsically safe and non- intrinsically safe circuits is preferred. Generally, no account is taken of the potential consequences of an explosion, nor of other factors such as the toxicity of materials.

Cold flow could give rise to a reduction in the insulation resistance of the cable and, where reasonably practical, efforts should be made to prevent this by selection of suitable cable glands.


The application of a cable sealing device may only mitigate the rate of vapour transmission and additional attenuation measures may be necessary. Conductors and connections shall be durable, flexible and of sufficient mechanical strength to withstand in-service movement. Such precautions may involve the sealing of trunking, ducts or pipes. Where trunking, ducts or pipes or trenches are used to accommodate cables, precautions should be taken to prevent the passage or collection of combustible dusts in such places.

Equipment marked for a specific gas, or marked for an apparatus a group plus a specific gas, and used in that specific gas atmosphere shall be installed in accordance with the requirements for the apparatus group to which the specific gas belongs. In material processing optical radiation of high irradiance is used. Failure of the primary seal should also be annunciated e. All electrical equipment shall be protected against the harmful effects of short-circuits and earth faults.

Control involves, for example: Where taper threads are used, the connection shall be made wrench tight. The bonding system may include protective conductors, metal conduits, metal cable sheaths, steel wire armouring and metallic parts of structures, but shall not include neutral conductors. Such devices shall be used in a hazardous area only if the specific location has been assessed to ensure that potentially flammable gas or vapour is absent during the period of use ‘gas-free’ situation.

It will usually be air, although an inert gas may be used, particularly when there is an internal source of release of flammable material. 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.

This Amendment applies to Clauses 4. This can be achieved by: For dated references, only the edition cited applies. NOTE Where the conduit is the sole means of earth continuity, this sealing should not reduce the nzss of the earth path.

Intrinsically safe circuits shall be earthed if this is necessary for safety reasons, for nzd in installations with safety barriers without galvanic isolation. Cables are exempted from this clause. Z o Under no circumstances may this PDF file be placed on a network of any sort without the express make are restricted to you.

NOTE 1 With the exception of item fail of the above are part of the process ass hazardous area classification. Contact Email, Phone and Address Details for this service in simple two column table format, header then data.


When electrical equipment is to be aw in areas where dangerous concentrations and az of flammable gases, vapours, mists or dusts may be present in ws 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.

NOTE 2 Gas or vapour leakage and propagation of flames may occur through the interstices between the strands of standard stranded conductors, or between individual cores of a cable. 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 la us e s 10 to Bas bta n c!

Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia

When such switching off might jeopardize the safety of the installation and safety is otherwise ensured, a continuous audible or visible alarm shall be provided until pressurization is restored or other appropriate measures are taken, including switching off with a known delay.

The sealing mechanism shall be such that it does not shrink on setting and sealing mechanisms shall be impervious to, and unaffected by, chemicals found in the hazardous area. Where there are a large number of cores, measurements should only be made utilizing a representative sample of the combination of cores which will create the largest values of inductance and capacitance. Guide for design and performance of a. NOTE 2 Precautions against electrolytic corrosion should be considered.

NOTE 2 This requirement is intended to apply to recently designed lamps where the pins or end caps may be plastic or ceramic with a conductive film coating.

Australian Hazardous Area Standards – AS-NZS | E-x Solutions

General requirements lECProtection of structures against lightning – Part 1: The protective gas shall not contain more oxygen by volume than that normally present in air. Plugs and sockets used for connection of external intrinsically safe circuits shall be separate from, and non-interchangeable with, those of circuits which are not intrinsically safe.

These cables are not admissible for bzs electrical equipment exposed to heavy mechanical stresses, for example hand-lamps, foot-switches, barrel nze, etc.