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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Such components should be chosen and located in the equipment so that they are representative of the thermal characteristics of the components they represent. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. This test shall be carried out after the pressure type test in 5.

A true risk assessment would consider all factors.

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

However, due to the small free volumes in the filling material and due to the quenching of a flame which may propagate through the paths in the filling material, an external explosion is prevented.

The enclosure with the breathing device in place shall comply at least with the degree of protection IP54 according to lEC Siandards for which Inaian Standards also exist The corresponding Indian Standards which are to be substituted in their respective places are listed belovv’ along with their degree of equivalence for the editions indicated: This standard applies to electrical equipment, parts of electrical equipment and Ex idc with: 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.

This Indian Standard has been developed from Doc No.: Ifc protection by atmospheres: Any breathing devices shall be in place. NOTE Isc, all the coal winning equipment will be constructed to meet the Mb requirements – for example Ex d motors and switchgear. NOTE The majority of the standard protection concepts bring equipment within iex equipment protection level.

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.

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60079-55 The maximum voltage between the parts shall be used to determine the distances according to Table 2. Prior to this, Ex ia was considered to be the only technique acceptable in zone 0.


These enclosures shall be marked with the symbol “X” in accordance with The degree of hazard is defined according to the probability of the cccurience of explosive atmospheres Generally, no account is taken of the potential consequences of an explosion, nor of other factors such as the toxicity of materials.

These EPLs are introduced to enable an aiternatlye approach to current methods of sefecting Ex equipment. 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.

If the manufacturer does not provide a equired shoii circuit. Attention is particularly drawn to the following: 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.

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

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At the end of any water ingress tests, no water shall be visible inside the enclosure. The number of significant places retained in the rounded off value should be the same as thai of the specified value in this standard.

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 6079-5 again historically correlate to zones For example, intrinsic safety is divided into levels of protection ia and ib. NOTE Typically, communications circuits and gas detection equipment will be constructed to meet the Ma.

Fault conditions according to 4. The enclosure shall be marked in accordance with 6 a. 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.

For dated references, only the edition cited applies. Equipment protection by powder filling ‘q’ [ETD Any of ied 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.

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This would make equipment selection easier and provide the ability to better apply a risk assessment approach, where appropriate. For distance under a coating according to Table 2, the following conditions apply: The filling material complies with the requirements, if the leakage current does not exceed A.


The pressure shall be applied for at least 10 s. Except’ where specified otherwise in this standard, the minimum distance through 60079–5 filling material between electrically conducting parts of the equipment and the inner surface of the enclosure shall comply with Table 1. 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 maximum gap of an enclosure protected by powder filling “q” shall be 600799-5 least 0,1 mm smaller than the specified smallest dimension of the filling material.

The encapsulation “m” standard includes two levels or protection “ma” and “mb”. Two separate test samples may be required. O introduction This annex provides an explanation of the concept of a risk isc metinod encompassing equipment protection levels EPLs.

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.

If the parts are etectricaily isolated, the sum of the maximum peak voltages of the two circuits shall be considered as peak voltage. 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. NOTE Suitable techniques that may provide visible evidence of being oec are. Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence.

There shall be no damage or distortion which could reduce the protection provided by the filling material. If the material fails to comply, further conditioning and retesting are not permitted.

The maximum peak voltage shall be assessed taking into account normal operating conditions transients being disregarded and fault conditions as specified In this standard. No part of the these publications may be reproduced in any form without tfie prior permission in writing of BIS. For undated references, the latest edition of the referenced document including any amendments applies. A test voltage of 1 V d.