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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Over-current devices shall have 6079-5 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 6079-5 supplements and modifies the general requirements of lEC Prior to this, Ex ia was considered to be the only technique acceptable in 6079-5 0. 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.

This does not apply to conductors used for externa! 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.

The effectiveness of the protection shall be confirmed by the test of 5 1. NOTE 2 Consideration shall be given to the effect that a release from lec breather may have- on the surrounding atmosphere.

Fault conditions according to 4.

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

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.


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.

If the manufacturer does not provide a equired shoii circuit. The closing and sealing shall be the methods of 4.

There shall be no damage or distortion which could reduce the protection provided by the filling material. These enclosures shall be marked with the symbol “X” in accordance with 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. This standard applies to electrical equipment, parts of electrical equipment and Ex components with: This standard supersedes IS The test shail be conducted on an empty enclosure without the powder filling installed.

Attention is particularly drawn to the following: Equipment protection by powder filling ‘q’ [ETD Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence. The maximum peak voltage shall be assessed taking into account normal operating conditions transients being disregarded and fault conditions as specified In this standard. Eic protection by increased safety “e” lEC 1Explosive atmospheres – Part 1 1: For further information, see Annex A.

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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 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. 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.

General requirements lECElectrical apparatus for explosive gas atmospheres – Part- 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. 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 enclosure shall be marked in accordance with 6 a. 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.

This would make equipment selection easier and provide the ability to better apply a risk assessment approach, where appropriate. Any breathing devices shall be in place.

For the purpose of deciding whether a particular requirement of tfiis standard is complied with, the final value, observed or calculated expressing kec result of a test, shall be rounded off in accordance with IS 2: Part 11 Equipment protection by intrinsic safety “i” IS For this purpose, the electrode arrangement shown in Figure 1 shall be used. A true risk assessment would consider all factors. Reference will also be included in the classification standards lEC and lEC The system of designating these equipment protection levels is as follows.

Part 7 Equipment increased safety “e” protection by increased safely “e” lEC 1 Explosive atmospheres — Part 1 1: The routine pressure test may be waived where the enclosure has passed a.

The number of significant places retained in the rounded off value should be the same as thai of the specified value in this standard. The lest voltage shall be 1 OOOVd.