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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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.

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

No part of the these publications may be reproduced in any form without tfie prior permission in writing of BIS. These enclosures shall be marked lec the symbol “X” in accordance with The closing and sealing shall be the methods of 4. Tests shall be carried out under normal equipment conditions, but may be effected without the filling material present. 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 the breather may have- on the surrounding atmosphere.

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At the end of any water ingress tests, no water shall be visible inside the enclosure. Search the history of over billion web pages on the Internet.

NOTE Ieec 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. Siandards for which Uec 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: Part 7 Equipment increased safety “e” protection by increased safely “e” lEC 1 Explosive atmospheres — Part 1 1: NOTE 2 The restriction on the size of the gap is intended to reduce the escape of filling material.


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. For dated references, only the edition cited applies. The maximum peak voltage shall be assessed taking into account normal operating conditions 60079-5 being disregarded and fault ief as specified In this standard.

The device shall not be self-resetting.

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Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. 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. 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.

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. 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.

There shall be no damage or distortion which could reduce the protection provided by the filling material. The routine pressure test may be waived where the enclosure has passed a.

Where integral fuses are used as protective devices, the fusing element shall be of the enclosed type, for example, in glass or ceramic.

NOTE 1 Sealed gas-tight cells do not release gas unde. Attention is particularly drawn to the following: 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.

Equipment protection by powder filling ‘q’ [ETD The pressure shall be applied for at least 10 s. 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. Prior to this, Ex ia was considered to be the only technique acceptable in zone 0.


The filling material complies with the requirements, if the leakage current does not exceed A. 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.

The system of ic these equipment protection levels is as follows. For this purpose, the electrode arrangement shown in Figure 1 shall be used.

The enclosure shall be marked in accordance with 6 b. The text of lEC Standard has been approved as suitable jec publication as an Indian Standard vi’ithout deviations.

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: The electrodes shall be covered by the filling materia!

Explosive atmospheres, Part 5: If the manufacturer does not provide a equired shoii ic.

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The degree of hazard is defined according to the 600779-5 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.

A true risk assessment would consider all factors. NOTE The majority of the standard protection concepts bring equipment within this equipment protection level.

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: Equipment protection by atmospheres: For further information, see Annex A. The encapsulation “m” standard includes ic levels or protection “ma” and “mb”.