SIST EN 60079-15:2004
(Main)Electrical apparatus for explosive gas atmospheres -- Part 15: Type of protection n
Electrical apparatus for explosive gas atmospheres -- Part 15: Type of protection n
Supersedes EN 50021:1999 * Superseded by EN 60079-15:2005
Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche -- Teil 15: Zündschutzart n
Matériel électrique pour atmosphères explosives gazeuses -- Partie 15: Mode de protection n
Električne naprave za eksplozivne plinske atmosfere - 15. del: Vrsta zaščite "n" (IEC 60079-15:2001; spremenjen)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche -- Teil 15: Zündschutzart
nMatériel électrique pour atmosphères explosives gazeuses -- Partie 15: Mode de protection
nElectrical apparatus for explosive gas atmospheres -- Part 15: Type of protection
n29.260.20Electrical apparatus for explosive atmospheresICS:Ta slovenski standard je istoveten z:EN 60079-15:2003SIST EN 60079-15:2004en01-marec-2004SIST EN 60079-15:2004SLOVENSKI
STANDARDSIST EN 50021:20001DGRPHãþD
SIST EN 60079-15:2004
EUROPEAN STANDARD
EN 60079-15 NORME EUROPÉENNE EUROPÄISCHE NORM
September 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-15:2003 E
ICS 29.260.20 Supersedes EN 50021:1999
English version
Electrical apparatus for explosive gas atmospheres Part 15: Type of protection "n" (IEC 60079-15:2001, modified)
Matériel électrique pour atmosphères explosives gazeuses Partie 15: Mode de protection "n" (CEI 60079-15:2001, modifiée)
Elektrische Betriebsmittel für gasexplosionsgefährdete Bereiche Teil 15: Zündschutzart "n" (IEC 60079-15:2001, modifiziert)
This European Standard was approved by CENELEC on 2003-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 60079-15:2004
EN 60079-15:2003 – 2 – Foreword The text of the International Standard IEC 60079-15:2001, prepared by IEC TC 31, Electrical apparatus for explosive atmospheres, together with common modifications prepared by SC 31-5, Apparatus type of protection "n", of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 60079-15 on 2003-07-01. This European Standard supersedes EN 50021:1999. This European Standard covers essential requirements of the EC Directive 94/9/EC (the ATEX Directive). The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop) 2004-07-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2006-07-01 Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only. In this draft European Standard, Annex ZA is normative. Annexe ZA has been added by CENELEC.
__________ SIST EN 60079-15:2004
– 3 – EN 60079-15:2003 Endorsement notice The text of the International Standard IEC 60079-15:2001 was approved by CENELEC as a European Standard with agreed common modifications as given below.
COMMON MODIFICATIONS 1 Scope Replace the text of Clause 1 by: This European Standard specifies requirements for the construction, testing and marking for Group II electrical apparatus with type of protection ‘n’, intended for use only in areas where explosive atmospheres of gas, vapour and mist are unlikely to occur or if they do occur, are likely to do so infrequently or for a short period only. This standard is applicable to non-sparking electrical apparatus and also to apparatus with parts or circuits producing arcs or sparks or having hot surfaces which, if not protected in one of the ways specified in this standard, could be capable of igniting a surrounding explosive atmosphere. A non-incendive component is limited in use to the particular circuit for which it has been shown to be non-ignition capable and, therefore, cannot be separately assessed as complying with this standard. This standard is applicable to electrical equipment and components of Group II, Category 3G. Such equipment is designed to be capable of functioning in conformity with the operating parameters established by the manufacturer and ensuring a normal level of protection. Equipment in this category ensures the requisite level of protection during normal operation. NOTE 1
In this standard the word ‘apparatus’ has the same meaning as the word ‘equipment’ used in the Directive. Compliance with this European Standard does not imply any removal of, or lowering of, the requirements of any other European Standard with which the electrical apparatus complies. This standard supplements, and may enhance, the requirements for apparatus for normal industrial applications. NOTE 2
The application of this standard may require the exercise of engineering judgement because of the wide range of apparatus and technologies covered. If apparatus is to be certified the relevant requirements may need to be agreed between the manufacturer and the testing station. NOTE 3
This standard makes several specific references to IEC 60079-0. It is not intended that apparatus with type of protection "n" should comply with IEC 60079-0 in its entirety, or that the level of protection achieved by compliance with this standard should be equal to the level of protection achieved by compliance with IEC 60079-0 and any of the types of protection listed therein. 3 Definitions 3.10
Ex component Add the following note to the definition: NOTE
Directive 94/9/EC defines a component as: Any item essential to the safe functioning of equipment and protective systems but with no autonomous function. In this standard, the words ‘Ex component’ have the same meaning as the word ‘component used in the Directive’. SIST EN 60079-15:2004
EN 60079-15:2003 – 4 – 19 Supplementary requirements for hermetically sealed devices producing arcs, sparks or hot surfaces Add the following note after the first paragraph. NOTE
A leakage rate equivalent to a He-leakage rate less than 10-2 Pa*l/sec (10-4 mbar*l/sec) at a pressure difference of 105 Pa (1 bar) is sufficient. 21 Supplementary requirements for energy-limited apparatus and circuits producing arcs, sparks or hot surfaces 21.8.1
Ratings of components Replace the text of 21.8.1 by: Any component on which the type of protection depends, except such devices as transformers, fuses, thermal trips, relays and switches, shall either - have a failure mode such that protection is maintained or, - not operate in normal conditions at more than two thirds of their maximum current, voltage and power related to the rating of the device, the mounting conditions and the temperature range specified. These maximum rated values shall be those specified by the manufacturer of the component. NOTE
Normal operation may include open-circuit, short-circuit and earth fault conditions at the field terminals. 22 Supplementary requirements for restricted-breathing enclosures protecting apparatus producing arcs, sparks or hot surfaces Replace the text of Clause 22 by: 22.1
Protection by restricted breathing enclosures may be applied under the following two circumstances with differing test and provision for maintenance according to the particular type. a) Enclosures containing sparking contacts but with a limitation in dissipated power such that the averaged air temperature within the enclosure does not exceed the external ambient temperature by more than 10 K. However the internal air temperature may exceed the external ambient temperature by up to 20 K if the rate of temperature decay, when the apparatus is de-energized, is limited to not more than 10 K/h. b) Enclosures not containing sparking contacts with limitation only in external surface temperature. NOTE 1
The use of a restricted-breathing enclosure to protect against ignition from sparking contacts is not allowed where, because of high internal air temperatures, there is an increased risk of drawing the hazardous atmosphere into the enclosure when the apparatus is de-energized. NOTE 2
The effects of the sun's direct heating on the exterior of the enclosure should be taken into account. This can cause a larger internal temperature change than the 10 K allowed. NOTE 3
Restricted breathing is not suitable for equipment operated on a short time duty cycle because of the increased probability that the apparatus might be de-energized when flammable gas or vapour surrounds the enclosure. 22.2
Equipment of type 22.1 a) shall be provided with a test point to enable routine testing of the restricted breathing properties to be carried out after installation and during routine maintenance. It shall be subject to the type test of 26.8.1. 22.3
Equipment of type 22.1 b) shall either be considered as being of type 22.1 a) or shall omit the test point and be subject to the type test of 26.8.2 SIST EN 60079-15:2004
– 5 – EN 60079-15:2003 22.4
Resilient gasket seals shall be positioned so that they are not subject to mechanical damage under normal operating conditions and they shall retain their sealing properties over the expected life of the device. Alternatively the manufacturer shall recommend a nominated replacement frequency. 22.5
Poured seals and encapsulating compounds shall have a continuous operating temperature (COT) at least 10 K higher than that occurring when operating in the most onerous rated service conditions. 22.6
Restricted-breathing enclosures without the provision for carrying out checks after installation or maintenance shall be type tested, including the cable entry devices. NOTE
The installation instructions provided with the apparatus should contain information on the selection of entry devices and cables. 22.7
If internal fans are fitted, the suction shall not induce a depression at a potential source of leakage. 26 Type tests 26.3.1
Order of tests Replace the text of 26.3.1 by: 26.3.1.1
Non-metallic enclosures and non-metallic parts of enclosures (other than glass) Tests shall be made on two samples which shall be submitted first to the tests of thermal endurance to heat (see 26.3.2.1), then to the tests of thermal endurance to cold (see 26.3.2.2), then to the mechanical tests (see 26.3.3), then to the tests for degrees of protection (IP) (see 26.3.4) or the tests for restricted breathing (see 26.8) and finally, when necessary, to any other test specified in this standard or any product standard. 26.3.1.2
Metallic enclosures, metallic parts of enclosures and glass parts of enclosures Tests shall be made on the number of samples specified for each test, first the mechanical tests (26.3.3), then to the tests for degrees of protection (IP) (see 26.3.4) or the te
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