IEC 60079-11:2011/ISH1:2014

Interpretation sheet 1 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"

Feuille d'intreprétation 1 - Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque "i"

General Information

• Status: Published
• Publication Date: 07-Oct-2014
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: SC 31G - Intrinsically-safe apparatus
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 13-Jan-2023

Relations

• Revised: IEC 60079-11:2023 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
• Effective Date: 05-Sep-2023
• Revised: IEC 60079-11:2011 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
• Effective Date: 05-Sep-2023

Standards Content (Sample)

SC 31G/IEC 60079-11 (2011), sixth edition/I-SH 01

EXPLOSIVE ATMOSPHERES –
Part 11: Equipment protection by intrinsic safety "i"

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 31G: Equipment for explosive

atmospheres – Equipment protection by intrinsic safety "i", of IEC technical committee 31.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
31G/235/ISH 31G/238/RVISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
Following decision No 16 of the TC 31 meeting in Melbourne in 2011, the issuing of an
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Interpretation Sheet for IEC 60079-11:2011 (6 edition ) was requested, in order to clarify the
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significance of the changes with respect to the 5 edition.
Question
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What are the minor editorial, extensions, and major technical changes of the 6 edition with
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respect to the 5 edition?
Answer
The following table shows the significance of the changes.
The significance of the changes between IEC Standard, IEC 60079-11, Edition 5, 2006-07 and
IEC 60079-11, Edition 6, 2011-06 are as listed below

October 2014 ICS 29.260.20
Significance of changes with respect to IEC 60079-11:2006

Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
General: Changes to remove specific clause references to General x

other IEC 60079 standards
Scope: Expansion to include Group III 1 x

Scope: Table 1 updated to include references to both 1 x

IEC 60079-0 Edition 5 and Edition 6

Normative references: Deletion of IEC 60079-27, and addition 2 x
of IEC 61158-2 and IEC 62013-1
Terms and definitions: Commonly used definitions moved to 3 x
IEC 60079-0. Energy limitation definitions moved from
IEC 60079-0.New definitions added
Spark ignition compliance: Group III ignition requirements 5.5 x
added
Temperature for small components for Group I and Group II: 5.6.2 x
Relocated to IEC 60079-0
Intrinsically safe apparatus and component temperature for 5.6.5 x
Group III
Enclosures for Group I or Group II apparatus 6.1.2 x
Apparatus complying with Annex F 6.1.2.3 c) x
Enclosures for Group III apparatus 6.1.3 x
Requirements for connections and accessories for IS 6.2.5  C1
apparatus when located in the non-hazardous area
Separation of conductive parts 6.3.2 x
Encapsulation 6.6.1 x
Encapsulation used for the exclusion of explosive 6.6.2  C2
atmospheres
Primary and secondary cells and batteries 7.4.1 x
Battery construction 7.4.2 x
Level of Protection “ic” 8.1 x
Filter capacitors 8.6.2 x
Wiring, printed circuit board tracks, and connections 8.8 c) x
FISCO apparatus 9.2 x
Handlights and caplights 9.3 x
Circuits with both inductance and capacitance 10.1.5.2 x
Electrolyte leakage test for cells and batteries 10.5.2 x
Spark ignition and surface temperature of cells and batteries 10.5.3 x
Determination of the acceptability of fuses requiring 10.6.2 x
encapsulation
Optical isolators tests 10.11 x
Marking 12.1 x
Encapsulation Annex D  C2
Fieldbus intrinsically safe concept (FISCO) – Apparatus Annex G x
requirements
Ignition testing of semiconductor limiting power supply circuits Annex H x

October 2014 ICS 29.260.20
Explanation of the Types of Significant Changes:

A) Definitions
1. Minor and editorial changes:
• Clarification
• Decrease of technical requirements

• Minor technical change
• Editorial corrections
These are changes which modify requirements in an editorial or a minor technical way. They include changes of

the wording to clarify technical requirements without any technical change, or a reduction in level of existing

requirement.
2. Extension: Addition of technical options

These are changes which add new or modify existing technical requirements, in a way that new options are given,
but without increasing requirements for equipment that was fully compliant with the previous standard. Therefore,
these will not have to be considered for products in conformity with the preceding edition.
3. Major technical changes: • addition of technical requirements
• increase of technical requirements
These are changes to technical requirements (addition, increase of the level or removal) made in a way that a
product in conformity with the preceding edition will not always be able to fulfil the requirements given in the later
edition. These changes have to be considered for products in conformity with the preceding edition. For these
changes additional information is provided in clause B) below.
NOTE These changes represent current technological knowledge. However, these changes should not normally
have an influence on equipment already placed on the market.
B) Information about the background of ‘Major technical changes’
C1 – Requirements for external connections, other than battery charging connections, that are designed for use
only when an explosive gas or dust atmosphere is not present, for example when in a non-hazardous area or when
a gas-free permit is in force, have been added.
C2 – The requirements for encapsulation referenced in 6.6.2 and detailed in Annex D have been changed in terms
of the thickness to the free surface and are extended related to moulding. Annex D is changed from informative to
normative.
October 2014 ICS 29.260.20
SC 31G/IEC 60079-11 (2011), sixième édition/I-SH 01

ATMOSPHÈRES EXPLOSIVES –
Partie 11: Protection de l'équipement par sécurité intrinsèque "i"

FEUILLE D'INTERPRÉTATION 1
Cette feuille d’interprétation a été établie par le sous-comité 31G: Matériels pour atmosphères

explosives – Matériels à sécurité intrinsèque «i», du comité d'études 31 de l'IEC.
Le texte de cette feuille d’interprétation est issue des documents suivants:
ISH Rapport de vote
31G/235/ISH 31G/238/RVISH
Le ra
...