EN 60079-11:2007

SLOVENSKI STANDARD
01-december-2007
1DGRPHãþD
SIST EN 50020:2003
(NVSOR]LYQHDWPRVIHUHGHO=DãþLWDRSUHPH]ODVWQRYDUQRVWMRL,(&

Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Explosionsfähige Atmosphäre - Teil 11: Geräteschutz durch Eigensicherheit "i"
Atmospheres explosives - Partie 11: Protection de l'équipement par sécurité intrinseque
"i"
Ta slovenski standard je istoveten z: EN 60079-11:2007
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60079-11
NORME EUROPÉENNE
January 2007
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 50020:2002

English version
Explosive atmospheres -
Part 11: Equipment protection by intrinsic safety "i"
(IEC 60079-11:2006)
Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 11: Protection de l'équipement Teil 11: Geräteschutz durch
par sécurité intrinsèque "i" Eigensicherheit "i"
(CEI 60079-11:2006 + corrigendum 2006) (IEC 60079-11:2006)

This European Standard was approved by CENELEC on 2006-10-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-11:2007 E
Foreword
The text of document 31G/159/FDIS, future edition 5 of IEC 60079-11, prepared by SC 31G, Intrincisally
safer apparatus, of IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-
CENELEC parallel vote and was approved by CENELEC as EN 60079-11 on 2006-10-01.
This European Standard supersedes EN 50020:2002.
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) 2007-08-01
– latest date by which the national standards conflicting
(dow) 2009-10-01
with the EN have to be withdrawn
This standard supplements and modifies the general requirements of EN 60079-0:2006, except as
indicated in Table 1 (see Scope).
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 94/9/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-11:2006 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60079-15 NOTE  Harmonized as EN 60079-15:2005 (not modified).
IEC 61086-1 NOTE  Harmonized as EN 61086-1:2004 (not modified).
__________
- 3 - EN 60079-11:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60079-0 (mod) 2004 Electrical apparatus for explosive gas EN 60079-0 2006
atmospheres -
Part 0: General requirements
1) 2)
IEC 60079-7 – Explosive atmospheres - EN 60079-7 2007
Part 7: Equipment protection by Increased
safety "e"
1) 2)
IEC 60079-25 – Electrical apparatus for explosive gas EN 60079-25 2004
atmospheres - + corr. April 2006
Part 25: Intrinsically safe systems

1) 2)
IEC 60079-27 – Electrical apparatus for explosive gas EN 60079-27 2006
atmospheres -
Part 27: Fieldbus intrinsically safe concept
(FISCO) and Fieldbus non-incendive concept
(FNICO)
1) 2)
IEC 60085 – Electrical insulation - Thermal classification EN 60085 2004

1) 2)
IEC 60112 – Method for the determination of the proof and EN 60112 2003
the comparative tracking indices of solid
insulating materials
IEC 60127 Series Miniature fuses EN 60127 Series

1)
IEC 60317-3 – Specifications for particular types of winding – –
wires -
Part 3: Polyester enamelled round copper
wire, class 155
1) 2)
IEC 60317-7 – Specifications for particular types of winding EN 60317-7 1994
wires -
Part 7: Polyimide enamelled round copper
wire, class 220
1) 2)
IEC 60317-8 – Specifications for particular types of winding EN 60317-8 1994
wires -
Part 8: Polyesterimide enamelled round
copper wire, class 180
1)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year
1) 2)
IEC 60317-13 – Specifications for particular types of winding EN 60317-13 1994
wires -
Part 13: Polyester or polyesterimide
overcoated with polyamide-imide enamelled
round copper wire, class 200
1) 2)
IEC 60529 – Degrees of protection provided by enclosures EN 60529 1991
(IP Code) + corr. May 1993
IEC 60664-1 1992 Insulation coordination for equipment within
+ A1 2000 low-voltage systems -
+ A2 2002 Part 1: Principles, requirements and tests EN 60664-1 2003

IEC 60664-3 2003 Insulation coordination for equipment within EN 60664-3 2003
low-voltage systems -
Part 3: Use of coating, potting or moulding
for protection against pollution

1)
ANSI/UL 248-1 – Low-voltage Fuses - – –
Part 1: General requirements
- 5 - EN 60079-11:2007
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers only the
following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:
– ER 1.0.1, ER 1.0.2, ER 1.0.4, ER 1.0.5 (partly), ER 1.0.6 (partly)
– ER 1.1 (partly)
– ER 1.2.1 (partly), ER 1.2.2 (partly), ER 1.2.5, ER 1.2.6
– ER 1.3.1
– ER 1.6.4
– ER 2.0.1.1, ER 2.0.1.2, ER 2.0.1.3 (partly), ER 2.0.1.4
– ER 2.0.2.1, ER 2.0.2.2, ER 2.0.2.3 (partly)
– ER 2.1.1.1 to ER 2.1.1.3
– ER 2.2.1.1 to ER 2.2.1.3
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
IEC 60079-11
Edition 5.0 2006-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 11: Equipment protection by intrinsic safety "i"

Atmosphères explosives –
Partie 11: Protection de l’équipement par sécurité intrinsèque «i»

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XE
CODE PRIX
ICS 29.260.20 ISBN 2-8318-8749-6

60079-11  IEC:2006 – 3 – – 2 – 60079-11 © IEC:2006
CONTENTS
FOREWORD.6

Scope.8
2 Normative references.10
3 Terms and definitions .11
4 Grouping and classification of intrinsically safe apparatus and associated apparatus .16
5 Levels of protection and ignition compliance requirements of electrical apparatus.16
5.1 General .16
5.2 Level of protection "ia" .16
5.3 Level of protection "ib" .17
5.4 Level of protection "ic" .17
5.5 Spark ignition compliance .18
5.6 Thermal ignition compliance .18
5.7 Simple apparatus.22
6 Apparatus construction .22
6.1 Enclosures .23
6.2 Facilities for connection of external circuits .23
6.3 Separation distances .27
6.4 Protection against polarity reversal .38
6.5 Earth conductors, connections and terminals .38
6.6 Encapsulation.40
7 Components on which intrinsic safety depends.40
7.1 Rating of components .40
7.2 Connectors for internal connections, plug-in cards and components .41
7.3 Fuses .41
7.4 Primary and secondary cells and batteries .42
7.5 Semiconductors.46
7.6 Failure of components, connections and separations.47
7.7 Piezo-electric devices .48
7.8 Electrochemical cells for the detection of gases .48
8 Infallible components, infallible assemblies of components and infallible
connections on which intrinsic safety depends.48
8.1 Mains transformers.48
8.2 Transformers other than mains transformers.50
8.3 Infallible windings .5 1
8.4 Current-limiting resistors.52
8.5 Blocking capacitors.52
8.6 Shunt safety assemblies .53
8.7 Wiring, printed circuit board tracks, and connections. .54
8.8 Galvanically separating components .56

60079-11 © IEC:200660079-11  IEC:2006 – 5 – – 3 –
9 Diode safety barriers.57
9.1 General . 57
9.2 Construction .57
10 Type verifications and type tests .57
10.1 Spark ignition test.57
10.2 Temperature tests .62
10.3 Dielectric strength tests .62
10.4 Determination of parameters of loosely specified components.63
10.5 Tests for cells and batteries.63
10.6 Mechanical tests.65
10.7 Tests for apparatus containing piezoelectric devices .65
10.8 Type tests
...