IEC 60079-28:2006/ISH1:2014

Intrepretation Sheet 1 - Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation

Outlines the fundamental conditions necessary for the creation of each hazard. It includes identification and characterization of the possible hazards inherent in the application, use, and abuse of nickel-cadmium cells and batteries. It also includes examples for appliance design which minimizes these hazards. Additionally it presents some typical but non-exhaustive examples of misuse that may precipitate or actions which mitigate the hazard.

Feuille d'interprétation 1 - Atmosphères explosives - Partie 28: Protection du matériel et des systèmes de transmission utilisant le rayonnement optique

Décrit les conditions fondamentales nécessaires à la création de chaque risque. Il couvre l'identification et la caractérisation des risques potentiels inhérents à l'application, à l'emploi et à l'emploi abusif des accumulateurs nickel-cadmium. Il comprend également des exemples de conception d'appareils minimisant ces risques. En outre, il présente, de manière non-exhaustive, quelques exemples types d'emploi abusif qui peuvent aggraver le risque, ou d'actions qui peuvent l'atténuer.

General Information

• Status: Published
• Publication Date: 18-Mar-2014
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: TC 31 - Equipment for explosive atmospheres
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 27-May-2015

Relations

• Revised: IEC 60079-28:2015 - Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation
• Effective Date: 05-Sep-2023
• Revises: IEC 60079-28:2006 - Explosive atmospheres - Part 28: Protection of equipment and transmission systems using optical radiation
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TC 31/IEC 60079-28:2006, First edition/I-SH 01
Explosive atmospheres –
Part 28: Protection of equipment and transmission
systems using optical radiation
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
31/1102/ISH 31/1114/RVD
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.
___________
IEC 60079-28:2006 (1st edition) Explosive atmospheres – Protection of equipment and
transmission systems using optical radiation
Following decision No 12 of the TC 31 meeting in Melbourne in 2011, the issuing of an
st
Interpretation Sheet for IEC 60079-28:2006 (1 edition ) was requested, in order to clarify the
scope of the existing standard.
Question
Does the scope of this standard cover
1) non-array divergent LEDs;
2) luminaires;
3) optical radiation sources for Mb, Gb or Gc applications which comply with Class 1 limits
in accordance with IEC 60825-1;
4) single or multiple optical fibre cables not part of optical fibre equipment; or
5) enclosed equipment involving an enclosure that fully contains the optical radiation and
that complies with a suitable type of protection?
Answer
This standard applies to optical fibre equipment and optical equipment, including LED and
laser equipment, with the exception of the equipment detailed below:
1) Non-array divergent LEDs used for example to show equipment status or backlight
function.
2) All luminaires (fixed, portable or transportable), hand lights and caplights (other than for
Group I) intended to be supplied by mains (with or without galvanic isolation) or powered
by batteries
− with continuous divergent light sources (for all EPLs);
− with LED light sources (for EPL Gc only).

March 2014 ICS 29.260.20 French text overleaf

3) Optical radiation sources for Mb, Gb or Gc applications which comply with Class 1 limits in
accordance with IEC 60825-1.
4) Single or multiple optical fibre cables not part of optical fibre equipment if the cables
− comply with the relevant industrial standards, along with additional protective means,
e.g. robust cabling, conduit or raceway (for Gb, Mb or Gc );
− comply with the relevant industrial standards (for Gc).
5) Enclosed equipment involving an enclosure that fully contains the optical radiation and
that complies with a suitable type of protection as required by the involved EPL, with the
enclosure complying with one of the following conditions:
− an enclosure for which an ignition due to optical radiation in combination with
absorbers inside the enclosure would be acceptable (such as flameproof "d"
enclosures), or
− an enclosure for which protection regarding ingress of an explosive atmosphere is
provided, such as pressurized "p" enclosures, restricted breathing “nR” enclosure", or
− an enclosure for which protection regarding ingress of absorbers is provided (such as
IP 6X enclosures) and where no internal absorbers are to be expected.
NOTE For these scope exclusions it is anticipated that the enclosures are not opened in the explosive
atmosphere, so that ingress is protected.

March 2014 ICS 29.260.20 French text overleaf

CE 31/IEC 60079-28:2006, Première édition/I-SH 01
Atmosphères explosives –
Partie 28: Protection du matériel et des systèmes de
transmission utilisant le rayonnement optique
FEUILLE D'INTERPRÉTATION 1
Cette feuille d’interprétation a été établie par le comité d'études 31 de l'IEC: Equipements
pour atmosphères explosives.
Le texte de cette feuil
...