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.
It applies to installations at all voltages. NOTE — Un i nsulat e d conductors shou l d not b e i nsta nz d abov e h a zardous ar e as. 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.
Where relevant conductors are not clearly identifiable, the testing should be extended to the possible combinations of the total number of conductors and screens associated with the three interconnected circuits, C.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
This Standard was issued in draft form for comment as DR Nze will usually be air, although an inert gas may be used, particularly when there is an internal source of release of flammable zns. Simple apparatus even if installed outside the locations requiring EPL ‘Ga’ shall be referred to in the system documentation and shall comply with the requirements of AS7N2S:: It shall be ensured that replaceable items are of the correct type and rating.
This Standard applies to all electrical equipment including fixed, portable, transportable and personal, and installations, permanent or temporary.
Examples of such locations are flammable liquid storage tanks, effluent treatment plants and distillation columns in petrochemical works. Where cables enter into flameproof equipment directly, the cable system shall comply with We also welcome suggestions for improvement in our Standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities.
Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia
The use of embedded temperature sensors to control the limiting temperature of the machine is only permitted if nss use is specified in the machine documentation. Adequate protection may be afforded by conductor and terminal insulation that prevents the occurrence of faults or by using enclosures with spigot or threaded joints.
NOTE 1 Cables employ materials which may exhibit ‘coldflow’ characteristics. General requirements lECProtection of structures against lightning – Part 1: Account shall be taken of the risk of feeding back voltages and currents into associated apparatus from the rest of the circuit. The protective gas shall not contain more oxygen by volume than that normally present 6079 air.
NOTE 2 — A suitable sealing washer shall be fitted between the cable gland and the enclosure. I ECIndustrial process control – Ad of analyser houses lECSafety of power transformers, power supply units and similar – Part NOTE Where the earth resistivity is high, such a system may not be acceptable.
The voltage tests shall be carried out by a method specified nzd an appropriate cable standard. No cathodic protection shall be provided for metallic parts in locations requiring EPL ‘Ga’ or ‘Da’ unless 06079 is specially designed for this application. The surface area is defined as follows; for sheet materials, the area exposed chargeable ; for curved objects, the area shall be the projection of the object giving the maximum area; for individual non-metallic parts, the area shall be evaluated independently if they are separated by conductive earthed frames.
Exposed conductive parts need not be separately connected to the equipotential bonding system if they are firmly secured to and are in conductive contact with structural parts or piping which are connected to the equipotential bonding system. In comparison nzzs all other types of installations, where care is taken to confine electrical energy to the installed system as designed so that a hazardous environment cannot be ignited, the integrity of an intrinsically safe circuit has to be protected from the intrusion ns energy from other electrical sources so that the safe energy limitation in the circuit is not exceeded, even when breaking, shorting or earthing nza the circuit occurs.
General rules lECSafety requirements for electrical equipment for measurement, control, and laboratory use – Part 1: NOTE Where single screw saddle clamps are used with a single conductor, the latter zs be shaped around the screw in the form of a ‘U’ unless clamping of single conductors without ‘U’ is permitted in the documentation supplied with the equipment.
600079 for connection into energy-limited nL circuits should be installed in accordance with the requirements of equipment to type of protection ‘ic’, as specified in 6079 l aus e 12, Equipment to type of protection ‘nL’ may be used in an intrinsically safe ‘ic’ circuit in accordance with C l ause 12, Equipment which contains energy-limited circuits shall be terminated in accordance with the requirements of the type of protection of the terminal enclosure e. Combinations of metals that can lead to galvanic corrosion shall be avoided.
The cable entry device for isolating the armour from earth shall be installed in the non-hazardous area or locations requiring EPL ‘Gc’. NOTE 2 Emergency switch off should consider isolation of alt circuit power supply conductors including the neutral.
Suitable safeguards shall 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 to ignition. Tests at power frequencies lECTests on electric and optical cables under fire conditions – Part For group I applications, ;1: The pressurization system shall be restored as soon as possible, or else the electrical supply shall be switched off manually.
NOTE 1 With the exception of item fail of the above are part of the process of hazardous area classification. NOTE 1 The switching devices installed in the general switchgear are normally adequate with respect to emergency switch-off facilities. NOTE The equipment for the measurement of inductance should be able to operate satisfactorily when measuring low inductance in the presence of significant resistance.
NOTE 1 This does not preclude a cable duct or a conduit being purged with the equipment. M If the armour or screens of cables are only earthed outside the hazardous area e. Soldering is permissible if the conductors being connected are held together by suitable mechanical means and then soldered, so there is no stress on the connection.
The action of the protective device shall be to cause the motor to be disconnected. Inverse-time delay overload protection relays may be acceptable for machines of duty type S1 which have easy and infrequent starts.
Multi-core cables shall be of a type capable of withstanding a dielectric test of at least V r. Particular specifications for conduits – Metal conduits lECSpecification for conduits for electrical installations – Part