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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The calculation of the capacitance depends on the electrical connection of bus cable and screen. 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 nza.
The documents should be prepared and maintained such that all the information relevant to a particular installation can be easily accessed.
The use of embedded temperature sensors to control the limiting temperature of the machine is only permitted if such use is specified in the machine documentation. This can be achieved by not using plastic, which is covering a conductive material. At any point of transition from TN-C to TN-S, the protective conductor shall be connected to the equipotential bonding system in the non-hazardous area.
Account shall be taken of the risk of feeding back voltages and currents into associated apparatus from the rest of the circuit. Equipment which does not produce ignition-capable sparks or particles in normal operation. The maximum inductance should be measured by connecting together the remote ends of the two cores which are spaced furthest from qs another.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
Thr e ad e d adapters comp l ying w i th l EC may be fitt e d i nto the cab le e ntry ho le s to a ll ow connection of the d e v i ce or cab le gland. This may be achieved by: 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 nzd, iii the thickness of dust layers where there is a potential for combustion to occur due to heating.
M If the armour or screens of cables are only earthed outside the hazardous area e. NOTE 2 Gas or vapour nss and propagation of flame may occur through the interstices between the strands of standard stranded conductors, or between individual cores of a cable.
Guide for design and performance of a. Where cables are subject to vibration, they shall be designed to withstand that vibration without damage.
AS-NZS 60079-14: Explosive atmospheres – Electrical installations design, selection and erection
Contact Email, Phone and Address Details for this service in simple two column table format, header then data. Associated apparatus with galvanic isolation between the intrinsically safe and non- intrinsically safe circuits is preferred.
However th e r e quir e m e nts for non – haz a rdous areas ar e i 600799 ie nt for inst alla t i bzs i n h a z a rdous ar e as. Generally, no account is taken of the potential consequences of an explosion, nor of other factors such as the toxicity of materials. Installations with cathodic protection shall not be connected to the equipotential bonding system unless the system is specifically designed for this purpose.
U ;;ic Wor fixe0,:. They reflect the latest scientific and industry experience. Guidance on the determination of cable parameters is given in Insulation by tape xs is not permitted. Non-sheathed insulated single or multicore cables may be used in the conduits. Ducting should be located in a non-hazardous area as far as is reasonably practicable.
In the case of series connection of the associated apparatus with galvanic isolation between intrinsically safe and non-intrinsically safe circuits see Figure B.
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. 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 nza the correct voltage, frequency and other parameters.
NOTE 1 It is considered that soft starting is used for a short time period NOTE 2 For motors with type of protection ‘e’ terminal boxes, 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 6079 in the terminal box are taken into consideration.
In the above example: Combustible dust can be ignited by equipment in several ways: NOTE 1 The use of alunninium conductors in Ex ‘d’ flameproof nzd should be avoided in those cases where a fault leading to potentially severe arcing involving the conductors may occur in the vicinity 60097 a plain flanged joint.
This qs is to avoid the possibility of the screen carrying a possibly incendive level of circulating current in the event that there are local differences in earth potential between one end of the circuit and the other. A safe work permit nss be issued when a specific location has been assessed to ensure that gas or vapour is not present and is not expected to be present, in quantities which may give rise to flammable concentrations, during a specified period.
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 protective gas shall not contain more oxygen by volume than that nzzs present in air. Additional lengths of the conductors inside the enclosure running at maximum permitted current may give rise to increased internal temperature that may exceed the temperature class.
The prospective short-circuit current of the supply shall not be greater than 1 A. If different 660079 temperatures are required, care should be taken, that the cable gland and the associated parts are suitable nss such applications. The Installation Standard, lECallocates specific types of protection to specific zones, on the statistical basis that the more xs or frequent the occurrence of an explosive atmosphere, the greater the level of security required against the possibility of an ignition source being active.
These cables are not admissible for portable electrical equipment exposed to heavy mechanical stresses, for example hand-lamps, foot-switches, barrel pumps, etc. Conduit sealing devices shall seal around the outer sheath of 600799 cable where the cable is effectively filled or around the individual conductors inside the conduit.
NOTE 3 For motors with type of protection ‘e’ or ws terminal boxes, when using converters 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.
If the total sum 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.
Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia
The circuit including all simple compon e nts, s i mp le el e ctr i cal apparatus, intrinsically safe apparatus, associated apparatus and the maximum allowable electrical parameters of inter-connecting cables shall be of level of protection ‘ia’. Table – Action to be taken when the pressurization with the protective gas fails 6009 electrical equipment without an internal source of release EPL requirement Enclosure contains equipment not meeting EPL ‘Go’ requirements without pressurization 600799 contains equipment meeting EPL ‘Gc’ requirements without pressurization ‘Gb’ Apply 1 3, However, due to the snnall free volunnes in the filling nnaterial and due to the quenching of a flanne which may propagate through the paths in the filling materialman external explosion is prevented.
Conduit or tapered threads will require the use of a thread sealant see Cl a us e 9. It cannot ss too strongly emphasized that extreme care should be exercised in the selection nzzs application of these substances to ensure the retention of the non-setting characteristics and to allow subsequent separation of the joint surfaces, NOTE 2 Non-hardening grease-bearing textile tape nnay be ennployed outside of a straight flanged joint with the following conditions: Regulatory authorities may specify additional requirements for acceptance of equipment with alternative certification certified to alternative Standards.