IEC CSV Standard | Electrical apparatus for explosive gas atmospheres – Part 5: Sand-filled apparatus. Apr 29, 1DV This standard part of IEC contains specific requirements for the construction, testing and marking of electrical equipment, parts. Sep 13, IS/IEC Explosive atmospheres, Part 5: Equipment protection by powder filling ‘q’. by Bureau of Indian Standards. Publication date.
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Part 11 Equipment protection by intrinsic safety “i” IS However, due to the small free volumes in the filling material and due to the quenching of iiec flame which may propagate through the paths in the filling material, an external explosion is prevented.
Reference will also be included in 60079–5 classification standards lEC and lEC Transformers, coils and windings, which comply with I EC or transformers which comply with the requirements for mains transformers, level of protection ia or ib, in iEC 1 are not subject to fault. NOTE To simulate overload conditions which may cause higher temperatures than in normal operation, it might be suitable to use power components mounted in the equipment and subject to the maximum available power.
This standard supplements and modifies the general requirements of lEC For the majority of situations, with typical potential consequences from- a resultant explosion, it is intended that the fbllowing would apply for use of the equipment in zones this is not directly applicable for coal mining, as the zone concept does not generally apply.
The routine pressure test may be waived where the 600779-5 has passed a. The number of significant places retained in the rounded off value should be the same as thai of the specified value in this standard.
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Where items other than fuses are used as protective devices for temperature limitation, the equipment shall be tested to verify that the- limiting temperature is not exceeded when those protective devices operate. This test shall be carried out after the pressure type test in 5.
Prior to this, Ex ia was considered 600799-5 be the only technique acceptable in zone 0. For dated references, only the edition cited applies.
If the material fails to comply, further conditioning and retesting are not permitted. The device shall not be self-resetting. The filling material complies with the requirements, if the leakage current does not exceed A.
As noted eafliei, nowhere in the I EC system of explosion protection Is there any account taken of the potential consequences of an eyplosiori, should it occur However, plant operators often make intuitive decisions on e.
Equipment protection by increased safety “e” lEC 1Explosive atmospheres – Part 1 1: Search the history of over billion web pages on iex Internet.
The additional marking and the correlation of the existing types of protection are being introduced into the revisions to the following lEC standards: The degree of hazard is defined according to the probability of the cccurience of explosive atmospheres Generally, no account 600799-5 taken of the potential consequences of an explosion, nor of other factors such as the toxicity of materials.
The maximum voltage between the parts shall be used to determine the distances according to Table 2.
The lest voltage shall be 1 OOOVd. When determining the required values for creepage and clearance, the voltage vs be increased by a factor of 1 1 in order to iwc the range of rated voltages in common us uppiy voltages given lue Ml the table may. Tests shall be carried out under normal equipment conditions, but may be effected without the filling material present. Where bare parts of energized circuits emerge from the coating, the comparative tracking index CTI in Table 2 applies to both insulation and conformal coating.
The system of designating these equipment protection levels is as follows. NOTE Typically, communications circuits and gas detection equipment will be constructed to meet the Ma.
The 60709-5 shall be applied for at least IDs. Where a requirement of this standard conflicts with a requirement 60079-55 lECthe requirement of this standard will take precedence.
IS/IEC 60079-5: Explosive atmospheres, Part 5: Equipment protection by powder filling ‘q’
A true risk assessment would consider all factors. If a currerit-limiting device is necessary to limit the prospective short-circuit current to a value not greater than the rated breaking capacity of the fuse, this device shall be a resistor according to 4. Such components should be chosen and located in the equipment so that they are representative of the thermal characteristics of the components they represent.
Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: For this purpose, the electrode arrangement shown in Figure 1 shall be used.