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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The system of designating these equipment protection levels is as follows. This does not preclude the free 06079-5, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.

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The lest voltage shall be 1 OOOVd. These enclosures shall be marked with the symbol “X” in accordance with Where a requirement of this standard conflicts with a requirement of lECthe requirement of this standard will take precedence.

Two separate test samples may be required. Explosive atmospheres, Part 5: Test sieves of perforated plates ISO Test sieving — Methods using test sieves of woven wire cloth and perforated 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. The ied 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.

The additional marking and the correlation of the existing types of protection are being introduced into the revisions to the following lEC standards: There shall be no damage or distortion which could reduce the protection provided by the filling material. The enclosure with the breathing device in place shall comply at least with the degree of protection IP54 according to lEC This Indian Standard has been developed from Doc No.: For undated references, the latest edition of the referenced document including any amendments applies.


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. Reference will also be included 60079-5 the classification standards lEC and lEC Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments.

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. For further information, see Annex A. NOTE The majority of the standard protection concepts bring equipment within this equipment protection level. 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.

No part eic the these publications may be reproduced in any form without tfie prior permission in writing of BIS. 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. When determining the required values for creepage and clearance, the voltage vs be ifc 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. This standard applies to electrical equipment, parts of electrical equipment and Ex components with: Standards are also reviewed periodically; a standard alongwith amendments is reaffirmed when such review indicates that no isc are needed; if the review indicates that changes are needed, it is taken up for revision.

For this purpose, the electrode arrangement shown in Figure 1 shall be used. A true risk assessment would consider all factors.

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


Equipment protection by powder filling ‘q’ [ETD This standard supersedes IS Equipment protection by atmospheres: The pressure shall be applied for at least IDs. 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.

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NOTE 2 The restriction on the size of the gap is intended to reduce the escape of filling material. This does not apply to conductors used for externa! The routine pressure test may be waived where the enclosure has passed a. If the degree of protection is IP55 or higher, the enclosure shall be provided with a breathing device. 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.

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 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 06079-5 taking into account normal operating conditions transients being disregarded and fault conditions as specified Iex this standard. Part 11 Equipment protection by intrinsic safety “i” IS The enclosure shall be marked in accordance with 6 a.

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.