AS NZS 60079 PDF

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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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. In order to avoid dust ignition hazards it is necessary that: Significant technical changes included in this Standard, with respect to the previous lEC edition are as follows: I ECIndustrial process control – Safety of analyser houses lECSafety of power transformers, power supply units and similar – Part Type of protection ‘n’ is divided into 4 sub-types: Nnzs cables are not admissible for portable electrical equipment exposed to heavy mechanical stresses, for example hand-lamps, foot-switches, barrel pumps, etc.

As noted earlier, nowhere in the lEC system of explosion protection is 06079 any account taken of the potential consequences of an explosion, should it occur. The permissible values shall be taken from the associated a documentation or the marking plate. Special constructions can be employed as means of reducing leakage and preventing the propagation of flames.

Suitable grease may be used provided it is non-setting and any earthing between the two is maintained. The cable shall be suitable for the circuit protective arrangements, e. For undated references, the latest edition of the referenced document including any amendments applies. Conduit sealing devices, having parallel threads may be fitted with a sealing washer between the device and the flameproof enclosure providing that after the washer has been fitted, the applicable thread engagement is still achieved.

The cable entry device for isolating the armour from earth shall be installed in the non-hazardous area or locations requiring EPL ‘Gc’. Therefore, for delta wound machines, phase imbalance protection shall be provided which will detect machine imbalances before they can give rise to excessive heating effects.


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. In any industrial installation, irrespective of size, there may be numerous sources of ignition apart from those associated with electrical equipment.

NOTE 3 If earthing of the circuit is inherent in the circuit operation, as for example with a grounded tip thermocouple or a conductivity probe, this should be the only connection to earth, unless it can be demonstrated that no fault condition can arise as a result of the presence of more than one earth connection.

NOTE 1 In some cases, the highest surface temperature occurs on the motor shaft. The calculation of the capacitance depends on the electrical connection of bus cable and screen.

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

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 ws has been established for the correct voltage, frequency and other parameters. 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.

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. 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 produced in the terminal box are taken into consideration.

In the case of series connection of the associated apparatus with galvanic isolation between intrinsically safe and non-intrinsically safe circuits see Figure B.

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

Special cable construction can be employed as means of reducing migration and preventing the propagation of flame. A normative annex is an integral part of a Standard, whereas an informative annex is only for information and guidance. The following are represented on Committee EL The supply shall be prevented from being switched on again until the doors and covers have been re-closed.


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. For example, the exposed part of the bushings are within a terminal compartment which may either be another flameproof enclosure or will be protected by type of protection ‘e’.

Alteration of the internal components of the equipment is not permitted without re-evaluation of the equipment because conditions may be created inadvertently which lead to pressure- piling, change in temperature class, or other such issues that may invalidate the certificate. 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.

Where the terminal compartment is Ex ‘d’, then the cable system shall comply 06079 Artificial ventilation for the protection of analyzer s houses I ECEl e ctrical apparatus for e xplosiv e gas atmosph e r e s P a rt Intrinsically safe circuits shall be earthed if this is necessary for safety reasons, for example in installations with safety barriers without galvanic isolation.

Above 5 mm up to 50 mm thickness: Cables are exempted from this clause. The prospective short-circuit current of the supply shall not be greater than 1 A. Where cables enter into flameproof equipment directly, the cable system shall comply with For explosive dust atmospheres the present system of marking the zones on equipment is being replaced by marking the EPLs.

For example, if a low-pressure process gas in a containment system is at a lower pressure than the pressurizing air, any leakage path into the containment system will allow air into the process and produce a potentially adverse or dangerous effect zns the process. For trenches, adequate venting or sand-filling may be used.

It should read ‘Time ws major overhauls disassembly and cleaning where necessary ‘ as a detailed inspection az accordance with ASyN2S’6Q;1: The use of gaskets is only permissible when specified in manufacturer’s documentation.