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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To facilitate this, a system of equipment protection levels has been introduced to clearly indicate the inherent ignition risk of equipment, no matter what type of protection is used. 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.
Any breathing devices shall be in place. This Indian Standard has been developed from Doc No.: Equipment protection by powder filling ‘q’ [ETD Copyright BIS has the copyright of all its publications. Such components should be chosen and located in the equipment so that they are representative of the thermal characteristics of the components they represent.
A test voltage of 1 V d. Fault conditions according to 4.
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The maximum voltage between the parts shall be used to determine the distances according to Table 2. For dated references, only the edition cited applies. At the end of any water ingress tests, no water shall be visible inside the enclosure. If the material fails to comply, further conditioning and retesting are not permitted. This standard supplements and modifies the general requirements of lEC When determining the requiied values for distance, the voltage value in the table may be increased by a factor of 1 1 in order to recognize the range of rated voltages in common use.
The enclosure shall be marked in accordance with 6 b. The text of lEC Standard has been approved as suitable for publication as an Indian Standard vi’ithout deviations. 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.
For the purpose of deciding whether a particular requirement of tfiis standard is complied with, the final value, observed or calculated expressing the result of a test, shall be rounded off in accordance with IS 2: The effectiveness of the protection shall be confirmed by the test of 5 1. The enclosure with the breathing device in place shall comply at least with the degree of protection IP54 according to lEC This test shall be carried out after the pressure type test in 5.
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Explosive atmospheres, Part 5: The routine pressure test may be waived where the enclosure has passed a. 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.
Any of these markings may be repleced by technically equivalent information 7 Instructions All powder filled “q” equipment shall be accompanied by instructions as required by lECincluding the following additional particulars as a mintfrtum- – Where permitted by the manufacturer, details on the re-filling, re-sealing, and re-testing requirements tor powder filled “q” equipment that has been opened for repair.
Equipment protection by atmospheres: When determining the required values for creepage and clearance, the voltage vs be increased by a factor of 1 1 in order to recognize the range of rated voltages in common us uppiy voltages given lue Ml the table may. If the degree of protection is IP55 or higher, the enclosure shall be provided with a breathing device.
Standards are also reviewed periodically; a standard alongwith amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Acceptance of equipment info each zone is historically based on the type protection, in some cases the type cf protection may be divided into different levels of protection which again historically correlate to zones For example, intrinsic safety is divided into levels of protection ia and ib.
The system of designating these equipment protection levels is as follows.
Hazardous areas with the normal exception of coal mining; are divided into zones according to the degree of hazard. KOTH 1 It is acknowledged that the enclosure may need to be destroyed in order to determine tlie entrance of dust or water.
NOTE 2 The restriction on 600779-5 size of the gap is intended to reduce the escape of filling material. For further information, see Annex A.
A true risk assessment would consider all factors. Where bare parts of energized circuits emerge from the coating, idc comparative tracking index CTI in Table 2 applies to both insulation and conformal coating.
IS/IEC 60079-5: Explosive atmospheres, Part 5: Equipment protection by powder filling ‘q’
When Ex components protected by powder filling “q” are intended to be mounted inside another enclosure complying with lECthis outer enclosure shall have a degree of protection of at least l? For this purpose, the electrode arrangement shown in Figure 1 shall be used. Over-current devices shall have a voltage rating not less than that of the circuit and shall have a breaking capacity not less than the prospective fault current of the circuit. This does not apply to conductors used for externa!
As noted eafliei, nowhere in the I EC system of explosion protection Is there any account taken of the potential iev of an eyplosiori, should it occur However, plant operators often make intuitive decisions on e.
Siandards for which Inaian Standards also exist The corresponding Indian Standards which are to be substituted irc their respective places are listed belovv’ along with their degree of equivalence for the editions indicated: Conductive parts protruding from the insulation including soldered component pins shall not be considered as coated unless special measures have been applied to obtain an effective unbroken seal. For undated references, the latest edition of the referenced document including any amendments applies.
No part of the these publications may be reproduced in any form without tfie prior permission 60079- writing of BIS. The device shall not be self-resetting. Search the history of over isc web pages on the Internet. The number of significant places retained in the rounded off value should be the same irc thai of the specified value in this standard.
These enclosures shall be marked with the symbol “X” in accordance with 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 600799-5 and subject to the maximum available power.
The enclosure shall be marked in accordance with 6 a. O introduction This annex provides an explanation of the concept of a risk assessment metinod encompassing equipment protection levels EPLs. 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: The pressure shall be applied for at least 10 s. The electrodes shall be covered by the filling materia!