IEC 60079-5 PDF

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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Search the history of over billion web pages on the Internet. Explosive atmospheres, Part 5: 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.

Equipment protection by powder filling ‘q’ [ETD This standard supersedes IS The text of lEC Standard has been approved as suitable for publication as an Indian Standard vi’ithout deviations.

Attention is particularly drawn to the following: 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: Equipment protection by atmospheres: Part 7 Equipment increased safety “e” protection by increased safely “e” lEC 1 Explosive atmospheres — Part 1 1: Part 11 Equipment protection by intrinsic safety “i” IS For further information, see Annex A.

This standard supplements and modifies the general requirements of lEC Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence. This standard applies to electrical equipment, parts of electrical equipment and Ex components with: For dated references, only the edition cited applies.

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

For undated references, the latest edition of the referenced document including any amendments applies. General requirements lECElectrical apparatus for explosive gas atmospheres – Eic 1: Equipment protection by increased safety “e” lEC 1Explosive atmospheres – Part 1 isc 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 closing and sealing shall be the methods of 4. The enclosure shall be marked in accordance with 6 a. The enclosure shall be marked in accordance with 6 b. NOTE Suitable techniques that may provide visible evidence of being opened are.

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If the degree of protection is IP55 or higher, the enclosure shall be provided with a breathing device. The enclosure with the breathing device in place shall comply at least with the degree of protection IP54 according to lEC The test shail be conducted on an empty enclosure without the powder filling installed.

At the end of any water ingress tests, no water shall be visible inside the enclosure. KOTH 1 It is acknowledged that the enclosure may need to be destroyed in order to determine tlie entrance of dust or water. Two separate test samples may be required. These enclosures shall be marked with the symbol “X” in accordance with 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 gap of an enclosure protected by powder filling “q” shall be at least 0,1 mm smaller than the specified smallest dimension of the filling material. NOTE 2 The restriction on the size of the gap is intended to reduce the escape of filling material. 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.


Except’ where specified otherwise in this standard, the minimum distance through the filling material between electrically conducting parts of the equipment and the inner surface of the enclosure shall comply with Table 1. This does not apply to conductors used for externa!

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. Fault conditions according to 4. There shall be no damage or distortion which could reduce the protection provided by the filling material. NOTE 1 Sealed gas-tight cells do not release gas unde. NOTE 2 Consideration shall be given to the effect that a release from the breather may have- on the surrounding atmosphere.

The effectiveness of the protection shall be confirmed by the test of 5 1. 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. The maximum voltage between the parts shall be used to determine the distances according to Table 2.

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If the parts are etectricaily isolated, the sum of the maximum peak voltages of the two circuits shall be considered as peak voltage. The maximum peak voltage shall be assessed taking into account normal operating conditions transients 6079-5 disregarded and fault conditions as specified In this standard.

For distance under a coating according to Table 2, the following conditions apply: 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.

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. 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.

The device shall not be self-resetting. Where integral fuses are used as protective devices, the fusing element shall be of the enclosed type, for example, in glass or ceramic. 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. Higher prospective currents than 1 A could be present in some installations, for example at higher voltages.

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.

If the oec does not provide a equired shoii circuit. The pressure shall be applied for at least IDs. Any breathing devices shall be in place. This test shall be carried out after the pressure type test in 5. For this purpose, the electrode arrangement shown in Figure 1 shall be used. The electrodes shall be covered by the filling materia!

A test voltage of 1 V d. If the material fails to comply, further conditioning and retesting are not permitted. 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. 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.

Such components should be chosen and located in the equipment so that they are representative of the thermal characteristics of the components they represent. The pressure shall be applied for at least 10 s. Tests shall be carried 600795 under normal equipment conditions, but may be effected without the filling material present.

The routine iecc test may be waived where the enclosure eic passed a. The lest voltage shall be 1 OOOVd. The filling material complies with the requirements, if the leakage current does not exceed A. If the filling materia! 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.


O introduction This annex provides an explanation of the concept of a risk assessment metinod encompassing equipment protection levels EPLs.

These EPLs are introduced to enable an aiternatlye approach to current methods of sefecting Ex equipment. Hazardous areas with the normal exception of coal mining; are divided into zones according to the degree of hazard.

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. 600079-5 true risk assessment would consider all factors.

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Acceptance of equipment info each zone is historically based on the type protection, in some cases the type cf protection may be isc 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 encapsulation “m” standard includes two levels or protection “ma” and “mb”. 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.

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.

Prior to this, Ex ia was considered to be the only technique acceptable in zone 0. This would make equipment selection easier and provide the ability to better apply a risk assessment approach, where idc. 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. The system of designating these equipment protection levels is as follows.

NOTE Jec, communications circuits and gas detection equipment will be constructed to meet the Ma. NOTE Typically, 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 this equipment protection level. 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 kec coal mining, as the zone concept does not generally apply.

Reference will also be included in the classification standards lEC and lEC The additional marking and the correlation of the existing types of protection are being iev into the revisions to the following lEC standards: For explosive dust atmospheres, the present system of marking the zones on equipment is being replaced by marking the EPLs.

Test sieves of perforated uec ISO Test sieving — Methods using test sieves of woven wire cloth and 600079-5 metal plate Only the English language text of the international Standard has been retained while adopting it in this Indian Standard, and as such the page numbers given here are not the same as in lEC Standard.

For the purpose of deciding whether a particular requirement of tfiis standard is complied with, the final value, observed or 60709-5 expressing the result of a test, shall be rounded off in accordance with IS 2: The number of significant places retained in ic rounded off value should be the same as thai of the specified value in this standard. Bureau of Indian Standards BIS is a statutory institution established under tine Bureau of Indian Standards Act, to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright 6079-5 has the copyright of all its publications.