IEC 60079-5 PDF

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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NOTE The majority of the standard protection concepts bring equipment within this equipment protection level. 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.

If the filling materia!

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. For explosive dust ifc, the present system of marking the zones on equipment is being replaced by marking the EPLs.

If the manufacturer does not provide a equired shoii circuit. KOTH 1 It is acknowledged that the enclosure may need to be destroyed in order to determine tlie entrance of dust or water.

IS/IEC 60079-5: Explosive atmospheres, Part 5: Equipment protection by powder filling ‘q’

Reference will also be included in the classification standards lEC and 6007-95 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 test shail be conducted on an empty enclosure without the powder filling installed.

This does not apply to conductors used for externa!

Such components should be chosen and located in the equipment so that they are representative of the thermal characteristics of the components they represent. NOTE 2 The restriction on the size of the gap is intended to reduce the escape of filling material. There shall be no damage or distortion which could reduce the protection provided by the filling material.

NOTE Suitable techniques that may provide visible evidence 60097-5 being opened are. Equipment protection by atmospheres: The device shall not be self-resetting.

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Hazardous areas with the normal exception of coal mining; are divided into zones according to the degree of hazard. The pressure shall be applied for at least 10 s. The text of lEC Standard has been approved as suitable for publication as an Indian Standard vi’ithout deviations. 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.


Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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. 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.

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.

The lest voltage shall be 1 OOOVd. A true risk assessment would consider all factors. The encapsulation “m” standard includes two levels or protection “ma” and “mb”.

NOTE 1 Sealed gas-tight cells do not release gas unde. This would make equipment selection easier and provide the ability to better apply a risk assessment approach, where appropriate. NOTE It is not a requirement of this standard that conformity to the specification of the particle material and size rango of the particles needs to be verified.

Tests shall be carried out under normal equipment conditions, but may be effected without the filling material present. 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 enclosure shall be marked in accordance with 6 b.

The pressure shall be applied for at least IDs. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments.


Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence.

NOTE Typically, communications circuits and gas detection equipment will be constructed to meet the Ma. If the material fails to comply, further conditioning and retesting are not permitted. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

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Higher prospective currents than 1 A could be present in some installations, for example at higher voltages. 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.

At the end of any water ingress tests, no water shall be visible inside the enclosure. This standard supersedes IS This standard applies to electrical equipment, parts of electrical equipment and Ex components with: O introduction This annex provides an explanation of the concept of a risk assessment metinod encompassing equipment protection levels EPLs. The effectiveness of the protection shall be confirmed by the test of 5 1. For this purpose, the electrode arrangement shown in Figure 1 shall be used.

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? The maximum peak voltage shall be assessed taking into account normal operating conditions transients being disregarded and fault conditions as specified In this standard.

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If the degree ice protection is IP55 or higher, the enclosure shall be provided with a breathing device. In the past, she equipmenf selection standard has provided a solid link between the type of prolectton for the equipment and the zone in which the equipment can be used. The enclosure shall be marked in accordance with 6 a. Part 11 Equipment protection by intrinsic safety “i” IS

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