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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All electrical equipment shall be protected against the harmful effects of short-circuits and earth faults. NOTE The type of built-in temperature sensors and associated protective device will be identified on the machine. NOTE Such items nnay include: Such temperature rise may be most notable at constant rated load conditions.
Th e justification “55 Q. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Motors designed for arduous starting conditions or which are to be started frequently are acceptable only when suitable protective devices ensure that the limiting temperature is not exceeded. Extraneous conductive parts which are not part of the structure or of the electrical installation, for example frames of doors or windows, need not be connected to the equipotential bonding system, if there is no danger of voltage displacement.
Special constructions can 600799 employed as means of reducing leakage and preventing the propagation of flames. Since only one fault in the equipotential bonding system, in some cases, could cause an ignition hazard, associated apparatus without galvanic isolation shall be used only if the earthing arrangements are in accordance with item 2 of The installation method shall 6007 chosen with regard to the functional requirements of the circuits and in accordance with the manufacturer’s instructions.
Alternative methods 60709 mounting may be used if they offer similar integrity against interference and damage e. NOTE Pressurized 6007 protected by static pressurization should be moved to a non-hazardous area for refilling if pressurization is lost. If ducting passes through a hazardous area and the protective gas is at a pressure below atmospheric then the ducting shall be free from leaks. The presence or absence of 660079 additional absorber significantly influences the ignition.
The requirements of this Standard apply only to the use of equipment under normal or near normal atmospheric conditions. Appropriate continuing education or training shall be undertaken by personnel on a regular basis. Ax consult the Contact Officer for more information and to ascertain the level of compliance if any that may be required. If earthing of the circuit is required for functional reasons, the earth connection shall be made outside the locations requiring EPL ‘Ga’, but as close as is reasonably practicable to the EPL ‘Ga’ equipment.
Precautions shall be taken to prevent the build-up of static on surfaces of cables. NOTE 2 Gas or vapour migration and propagation of flame may occur through the interstices between the strands of standard stranded conductors, or between individual cores of a cable.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
If the protective devices are common, the opening of a door or cover need not switch off the electrical supply to the whole assembly or initiate the alarm provided that the said opening is preceded by switching off the electrical supply to that particular equipment, except to such parts as are protected by a suitable type of protection, the common protective device continues to monitor the pressure in all the other enclosures of the group, and the a switching on of the electrical supply to that particular equipment is preceded by the applicable cleaning procedure In order to avoid dust nsz hazards it is necessary that: They shall always have an equipment certificate for the complete assembly.
NOTE 3 Protection relay The protection relay for machines in accordance with type of protection ‘e’ should, in addition to the requirements of Claus e 7: The minimum clearances between the bare conducting parts of external conductors connected to terminals and earthed metal or other conducting parts shall be 3 mm.
Ex ‘nA’, Ex ‘d’, Ex ‘e’. In order to correctly install or extend an a installation, the following information, additional to that ae for non-hazardous areas, is required, where applicable: NOTE 2 Precautions against electrolytic corrosion should be considered. Published on 15 August It is often necessary to use electrical eqiilpment apparatus in locations where such combustible materials are present, and 6079 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.
The prospective short-circuit current of the supply shall not be greater than 1 A. In the absence of lEC standards on process sealing for electrical equipment, national or other applicable standards such as lEC should be followed. Intrinsically s a f e systems Ai! Magna Carta— Tutohinga Nui Kore rawa e hoko ki te tangata, e kore e whakakdihoretia, e tautuku ranei te 06079 ki te ture, tika ranei.
NOTE 1 If the first fault is not removed, a subsequent fault on nze same phase will not be detected, possibly leading to a dangerous situation.
Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia
It should be noted nas the application of a cable sealing device may only mitigate the rate of vapour transmission and additional attenuation measures may be necessary. NOTE – It is considered that soft starting is used for a short time period. Such devices shall be used in a 60079 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.
Areas 60079 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. NOTE It is only necessary to re-purge the enclosure after pressurization has been re-established if flammable gas was detected in the area while the manual override was in operation.
They may be earthed if necessary for functional reasons, for example with welded 660079. Where the conduit system is used as the protective earthing conductor, the threaded junction shall be suitable to carry the fault current which would flow when the circuit is appropriately protected by fuses or circuit-breakers.
The encapsulation ‘m’ standard includes two levels of protection ‘ma’ and ‘mb’. In the event that the conduit is installed in a corrosive area, the conduit material shall either be corrosion resistant or the conduit shall be adequately protected against corrosion. Equipment which does not produce ignition-capable sparks or particles in normal operation.
There shall be no union, 06079 or other fittings between the sealing device and the hazardous areas boundary. If the total nzss of the risk factors is greater than 6, then anti-condensation space heaters shall be employed, and special measures shall be applied to ensure that the enclosure does not contain an explosive gas atmosphere at the time of starting.
AS-NZS 60079-14: Explosive atmospheres – Electrical installations design, selection and erection
If all intrinsically safe circuit cables or all cables of circuits which are not intrinsically safe are armoured, metal sheathed or screened, then marking of intrinsically safe circuit cables is not required.
Arduous starting conditions are considered to exist if an inverse-time delay overload protective device, correctly selected as above, disconnects the motor before nzd reaches its rated speed.
Any wiring system subject to dust layers shall comply with the temperature requirements of 5. Flameproof joints shall not be painted. It shall also be substantially free from moisture, oil, dust, fibres, chemicals, combustibles and other contaminating material that may be dangerous or affect the satisfactory operation and integrity of the equipment.
Where applicable you must conduct all electrical work in accordance with this standard. In these cases, the procedure given in lEC is recommended. This can be achieved by: