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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O introduction This annex 600079-5 an explanation of the concept of a risk assessment metinod encompassing equipment protection levels EPLs.

The text of lEC Standard has been approved as suitable for publication as an Indian Standard 6007-5 deviations. Equipment protection by increased safety “e” lEC 1Explosive atmospheres – Part 1 1: 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 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.

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: Reference will also be included in the classification standards lEC and lEC The maximum peak voltage shall be assessed taking into account normal operating conditions transients being disregarded and fault conditions as specified In this standard.

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 routine pressure test may be waived where the enclosure has passed a.

Fault conditions 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. The lest voltage shall be 1 OOOVd. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. General requirements lECElectrical apparatus for explosive gas atmospheres – Part- 1: 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.

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

At the end of any water ingress tests, no water shall be visible inside the enclosure. Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence. This test shall be carried out after the pressure type test in 5. For distance under a coating according to Table 2, the following conditions apply: 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.

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This does not apply to conductors used irc externa! 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.

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.

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: NOTE Typically, communications circuits and gas detection equipment will be constructed to meet the Ma.


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.

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There shall be no damage or distortion which could reduce the protection provided by the filling material. NOTE 2 Consideration shall be given to the effect that a release from the breather may have- on the surrounding atmosphere.

The system of designating these equipment protection levels is as follows. The enclosure shall be marked in accordance with 6 a.

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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.

To facilitate this, a system of equipment protection levels has been introduced to clearly indicate the inherent ignition risk of equipment, no iiec what type of protection is used.

Prior to this, Ex ia was considered to be the only technique acceptable in zone 0. Hazardous areas with the normal exception of coal mining; are divided into zones according to the degree of hazard. For this purpose, the electrode arrangement shown in Figure 1 shall be used. This Indian Standard has been developed from Doc No.: NOTE Suitable techniques that may provide visible evidence of being opened are. Equipment protection by atmospheres: For dated references, only ied edition cited applies.