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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Zoning does not take account of the potential consequences of an explosion. Equipment which does not produce ignition-capable sparks or particles in normal operation. Other precautions might also be necessary in the use of equipment under conditions of extreme temperature and pressure.
Special constructions can be employed as means of reducing leakage and preventing the propagation of flames. Additional cable entry holes may be made into the enclosure providing this is permitted by the manufacturer’s documentation. In the case of identical circuits, failures need not be taken into consideration provided that each circuit passing through the cable has a safety factor for spark ignition parameters of four times that required for level of protection ‘ia’ or ‘ib’.
Additional holes shall not be made into flameproof enclosures. Added figures are not themselves shaded, but are 600079 by a shaded border.
The cable inductance and capacitance should then be calculated by subtracting the effective total inductance and capacitance from these reduced values. Connections shall ensure that the required creepage and clearance distances will not be reduced by the additional means which are required for connecting aluminium conductors.
Ducting should be located in a non-hazardous area as far as is reasonably practicable. NOTE 1 The use of alunninium conductors in Ex ‘d’ flameproof enclosures should be avoided in those cases where a fault leading to potentially severe arcing involving the conductors may occur in the vicinity of a plain flanged joint. Figure 2 – Nzw chart for cable entry devices into flameproof enclosures for cables complying with item b of Through a Memorandum of Understanding with the Commonwealth government.
Where intrinsically safe circuits have been identified by the use of light blue covered cable, then light blue covered cable shall not be used for other purposes in a manner nze location which could lead to confusion or detract from the effectiveness of the identification of intrinsically safe circuits.
Non-sheathed insulated single or multicore cables may be used in the conduits. I EC 26, Explosiv e atmosph e r e s — Port In this case, means or equipment for direct temperature control by embedded temperature sensors specified in the motor documentation, other aa measures for limiting the surface temperature aas the motor shall be provided or the speed control device ensures that the motor run up is such that the surface temperature is not exceeded.
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In such situations verification is possible by testing for vertical flame spread of vertically-mounted bunched wires or cables in accordance with lEC series.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
The spark-over voltage of the surge protection device shall be determined by the user and an expert for the specific installation. It applies to installations at all voltages. This applies also to the individual strands of a finely stranded conductor. EnergySafety Opens in new window.
Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia
Use of the equipment shall not be permitted If inspection reveals that the protective material has become damaged to the extent that the underlying protected metal is visible.
Guidance on the determination of cable parameters is given in Due to heat losses, it is unlikely that cable temperature will exceed T6. 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. New tape should be applied whenever existing tape is disturbed; where the enclosure is used in conjunction with gases allocated to group IIC, the tape should not be applied.
Connections shall be secure against self loosening and shall minimise the risk of corrosion which may reduce the effectiveness of connection. If sheaths or coverings are marked by a colour, the colour used for cables containing intrinsically safe circuits shall be light blue. Examples of excessively thick dust layers can be found in Annex G. This may be achieved by: Junction boxes and switches in intrinsically safe circuits can be assunned to have a temperature classification of T6.
NOTE The provision of two earthing conductors should be considered to facilitate testing. The connpetency of the person shall be relevant to the type of work to be undertaken s ee Ann e x F.
NOTE 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.
Suitable safeguards ass therefore be taken to prevent the occurrence of such frictional contact in circumstances where an explosive atmosphere may be present, because the simultaneous occurrence of the two sets of circumstances could lead ns ignition.
NOTE 1 It is considered that soft starting is used for a short time period NOTE 2 When using a soft start device with high-frequency pulses in the output, care should be taken to ensure that any overvoltage spikes and higher temperatures which may be produced in the terminal box are taken into consideration. This Amendment applies to Clauses 4.
In the event of failure of the protective gas, an alarm shall be given and corrective action taken to maintain the safety of the system.
Alternative marking measures shall be taken inside measuring and control cabinets, switchgear, distribution equipment, etc.
The operator shall take into account in making such an assessment i the need for a substantial safety margin, and ii the level of concentration in air of the applicable explosive dust required for a hazard to exist, and, if applicable, iii the thickness of dust layers where there is a potential for combustion to occur due to heating. They adopt different methodology with the primary differences being: Where Certified f ;;: Faces with angles do not allow the gland and associated fittings inserted in the hole to fit square to the face, resulting in ineffective sealing.
The effectiveness of the temperature control taking into account power, speed range, torque and frequency for the duty required shall be verified and documented. If different service temperatures are required, care should be taken, that the cable gland and the associated parts are suitable for such applications. No separation is required if metal sheaths or screens are used for the intrinsically safe circuits or the circuits which are not intrinsically safe. Precautions shall be taken to prevent the build-up of static on surfaces of cables.
NOTE There should be effective measures or procedures to prevent the restoration of supply to the equipment whilst the risk of exposing unprotected live conductors to an explosive gas atmosphere continues.
The method used 5: