Safety of laser products - Part 12: Safety of free space optical communication systems used for transmission of information (IEC 60825-12:2019)

This part of EN 60825 provides requirements and specific guidance for the manufacture and safe use of laser products and systems used for point-to-point or point-to-multipoint free space optical data transmission. This standard only addresses the open beam portion of the system. If portions of the equipment or system incorporate optical fibre that extends from the confinements of the enclosure(s), the manufacturing and safety requirements under EN 60825-1 apply to those portions only. This standard does not apply to systems designed for purposes of transmitting optical power for applications such as material processing or medical treatment. This standard also does not apply to the use of systems in explosive atmospheres. The objective of this part of EN 60825 is to: - provide information to protect people from potentially hazardous optical radiation produced by free space optical communication systems (FSOCS) by specifying engineering controls and requirements, administrative controls and work practices according to the degree of the hazard; - specify requirements for manufacturing, installation, service and operating organisations in order to establish procedures and provide written information so that proper precautions can be adopted.

Sicherheit von Lasereinrichtungen - Teil 12: Sicherheit von optischen Freiraumkommunikationssystemen für die Informationsübertragung

Sécurité des appareils à laser - Partie 12: Sécurité des systèmes de communications optiques en espace libre utilisés pour la transmission d'informations

This part of EN 60825 provides requirements and specific guidance for the manufacture and safe use of laser products and systems used for point-to-point or point-to-multipoint free space optical data transmission. This standard only addresses the open beam portion of the system. If portions of the equipment or system incorporate optical fibre that extends from the confinements of the enclosure(s), the manufacturing and safety requirements under EN 60825-1 apply to those portions only. This standard does not apply to systems designed for purposes of transmitting optical power for applications such as material processing or medical treatment. This standard also does not apply to the use of systems in explosive atmospheres. The objective of this part of EN 60825 is to: - provide information to protect people from potentially hazardous optical radiation produced by free space optical communication systems (FSOCS) by specifying engineering controls and requirements, administrative controls and work practices according to the degree of the hazard; - specify requirements for manufacturing, installation, service and operating organisations in order to establish procedures and provide written information so that proper precautions can be adopted.

Varnost laserskih izdelkov - 12. del: Varnost optičnih komunikacijskih sistemov v prostem prostoru, ki se uporabljajo za prenos informacij (IEC 60825-12:2019)

Ta del standarda EN 60825 podaja zahteve in posebne smernice za izdelavo in varno uporabo laserskih izdelkov in sistemov, ki se uporabljajo za optični prenos podatkov od točke do točke ali od točke do več točk v prostem prostoru. Ta standard obravnava samo del sistema, ki obsega odprti žarek. Če deli opreme ali sistema vsebujejo optična vlakna, ki segajo od meja zaprtih prostorov, se proizvodne in varnostne zahteve po EN 60825-1 uporabljajo samo za te dele. Ta standard se ne uporablja za sisteme, zasnovane za prenos optične moči pri uporabah, kot so obdelava materiala ali medicinsko zdravljenje. Ta standard se prav tako ne uporablja za uporabo sistemov v eksplozivnih atmosferah. Cilj tega dela standarda EN 60825 je: – zagotoviti informacije za zaščito ljudi pred potencialno nevarnim optičnim sevanjem, ki ga povzročajo optični komunikacijski sistemi v prostem prostoru (FSOCS), z določitvijo inženirskega nadzora in zahtev, upravnega nadzora ter delovnih praks glede na stopnjo nevarnosti; – določiti zahteve za organizacije za proizvodnjo, vgradnjo, servis in obratovanje, da se vzpostavijo postopki ter zagotovijo pisne informacije za namen sprejetja ustreznih previdnostnih ukrepov.

General Information

Status
Published
Publication Date
08-Aug-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
06-Jun-2019
Due Date
11-Aug-2019
Completion Date
09-Aug-2019

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SLOVENSKI STANDARD
SIST EN IEC 60825-12:2019
01-september-2019
Nadomešča:
SIST EN 60825-12:2004

Varnost laserskih izdelkov - 12. del: Varnost optičnih komunikacijskih sistemov v

prostem prostoru, ki se uporabljajo za prenos informacij (IEC 60825-12:2019)

Safety of laser products - Part 12: Safety of free space optical communication systems

used for transmission of information (IEC 60825-12:2019)
Sicherheit von Lasereinrichtungen - Teil 12: Sicherheit von optischen
Freiraumkommunikationssystemen für die Informationsübertragung

Sécurité des appareils à laser - Partie 12: Sécurité des systèmes de communications

optiques en espace libre utilisés pour la transmission d'informations
Ta slovenski standard je istoveten z: EN IEC 60825-12:2019
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
SIST EN IEC 60825-12:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60825-12:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 60825-12:2019
EUROPEAN STANDARD EN IEC 60825-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 31.260 Supersedes EN 60825-12:2004
English Version
Safety of laser products - Part 12: Safety of free space optical
communication systems used for transmission of information
(IEC 60825-12:2019)

Sécurité des appareils à laser - Partie 12: Sécurité des Sicherheit von Lasereinrichtungen - Teil 12: Sicherheit von

systèmes de communication optiques en espace libre optischen Freiraumkommunikationssystemen für die

utilisés pour la transmission d'informations Informationsübertragung
(IEC 60825-12:2019) (IEC 60825-12:2019)

This European Standard was approved by CENELEC on 2019-03-15. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60825-12:2019 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60825-12:2019
EN IEC 60825-12:2019 (E)
European foreword

The text of document 76/616/FDIS, future edition 2 of IEC 60825-12, prepared by IEC/TC 76 "Optical

radiation safety and laser equipment" was submitted to the IEC-CENELEC parallel vote and approved

by CENELEC as EN IEC 60825-12:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-12-15

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-03-15

document have to be withdrawn
This document supersedes EN 60825-12:2004.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 60825-12:2019 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 60079-0 NOTE Harmonized as EN IEC 60079-0
IEC 60812 NOTE Harmonized as EN IEC 60812
IEC 61508 (series) NOTE Harmonized as EN 61508 (series)
ISO 12100 NOTE Harmonized as EN ISO 12100
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SIST EN IEC 60825-12:2019
EN IEC 60825-12:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60825-1 - Safety of laser products - Part 1: EN 60825-1 2014
Equipment classification and requirements
AC 2017
IEC 60825-2 - Safety of laser products - Part 2: Safety of EN 60825-2 2004
optical fibre communication systems
(OFCS)
+ A1 2007
+ A2 2010
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SIST EN IEC 60825-12:2019
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SIST EN IEC 60825-12:2019
IEC 60825-12
Edition 2.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of laser products –
Part 12: Safety of free space optical communication systems used for
transmission of information
Sécurité des appareils à laser –
Partie 12: Sécurité des systèmes de communication optiques en espace libre
utilisés pour la transmission d'informations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.260 ISBN 978-2-8322-6458-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 60825-12:2019
– 2 – IEC 60825-12:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Requirements ................................................................................................................ 11

4.1 General remarks ................................................................................................... 11

4.2 Determination of access level ............................................................................... 13

4.2.1 General ......................................................................................................... 13

4.2.2 The use of Condition 2 ................................................................................... 13

4.2.3 The use of C7 ................................................................................................ 16

4.3 Impact of using automatic power reduction features .............................................. 16

4.4 Access level and classification requirements by location type ............................... 16

4.4.1 General ......................................................................................................... 16

4.4.2 Requirements for unrestricted locations ......................................................... 18

4.4.3 Requirements for restricted locations ............................................................. 22

4.4.4 Requirements for controlled locations ............................................................ 23

4.4.5 Requirements for inaccessible space ............................................................. 24

4.5 Classification ........................................................................................................ 24

4.5.1 General ......................................................................................................... 24

4.5.2 Automatic power reduction mechanisms (APR) .............................................. 25

4.6 Installation protection systems (IPS) ..................................................................... 26

4.7 Specular reflections .............................................................................................. 26

4.8 Organizational requirements ................................................................................. 26

4.8.1 Requirements for manufacturers of ready-to-use FSOCS transmitters or

turn key systems............................................................................................ 26

4.8.2 Installation and service organization requirements ......................................... 28

4.8.3 Operating organization requirements ............................................................. 29

Annex A (informative) Methods of hazard/safety analysis ..................................................... 30

Annex B (informative) Guidance for installing, servicing and operating organizations ........... 31

B.1 Working practices for FSOCSs .............................................................................. 31

B.1.1 General ......................................................................................................... 31

B.1.2 General working practices ............................................................................. 31

B.1.3 Additional working practices for Class/access level 1M, 2M, 3R, 3B and

4 systems ...................................................................................................... 32

B.2 Education and training .......................................................................................... 32

Bibliography .......................................................................................................................... 33

Figure 1 – Commercial structures ......................................................................................... 17

Figure 2 – Residential areas ................................................................................................. 18

Figure 3 – Examples of external location types ..................................................................... 19

Figure 4 – Class 1M or 2M transmitter near edge of unrestricted rooftop ............................... 20

Figure 5 – Class 1M transmitter in unrestricted location ........................................................ 21

Figure 6 – Class 3R transmitter in restricted location ............................................................ 23

Table 1 – Restrictions for product classes and access levels ................................................ 12

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SIST EN IEC 60825-12:2019
IEC 60825-12:2019 © IEC 2019 – 3 –

Table 2 – Measurement aperture diameters and distances for the default (simplified)

evaluation ............................................................................................................................. 14

Table 3 – Requirements for warning signs ............................................................................ 29

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SIST EN IEC 60825-12:2019
– 4 – IEC 60825-12:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF LASER PRODUCTS –
Part 12: Safety of free space optical communication
systems used for transmission of information
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60825-12 has been prepared by IEC technical committee 76:

Optical radiation safety and laser equipment.

This second edition cancels and replaces the first edition published in 2004. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) LEDs have been removed from the scope.

b) Normative references have been changed to refer the latest edition of the standards.

c) A description of the Condition 2 measurement and determination method for access level

has been added.
---------------------- Page: 10 ----------------------
SIST EN IEC 60825-12:2019
IEC 60825-12:2019 © IEC 2019 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
76/616/FDIS 76/617/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The list of all parts of the IEC 60825 series, published under the general title Safety of laser

products, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 11 ----------------------
SIST EN IEC 60825-12:2019
– 6 – IEC 60825-12:2019 © IEC 2019
SAFETY OF LASER PRODUCTS –
Part 12: Safety of free space optical communication
systems used for transmission of information
1 Scope

This part of IEC 60825 provides requirements and specific guidance for the manufacture and

safe use of laser products and systems used for point-to-point or point-to-multipoint free

space optical data transmission in the wavelength range from 180 nm to 1 mm. This document

only addresses the open beam portion of the system. If portions of the equipment or system

incorporate optical fibre that extends from the confinements of the enclosure(s), the

manufacturing and safety requirements in IEC 60825-2 apply to those portions only. This

document does not apply to systems designed for the purposes of transmitting optical power

for applications such as material processing or medical treatment. This document also does

not apply to the use of systems in explosive atmospheres (see IEC 60079-0).

Light-emitting diodes (LEDs) employed by free space optical communication systems

(FSOCSs), used for the purpose of free space optical data transmission, do not fall into the

scope of this document. This document covers lasers employed by FSOCSs used for the

purpose of free space optical data transmission.
This document:

• provides information to protect people from potentially hazardous optical radiation

produced by FSOCSs by specifying engineering controls and requirements, administrative

controls and work practices according to the degree of the hazard; and

• specifies requirements for manufacturing, installation, service and operating organizations

in order to establish procedures and provide written information so that proper precautions

can be adopted.

Because of the nature of FSOCSs, also known as optical wireless or free-air information

transmission systems, care is taken in their manufacture as well as their installation,

operation, maintenance and service to assure the safe deployment and use of these systems.

This document places the responsibility for certain product safety requirements, as well as

requirements for providing appropriate information on how to use these systems safely, on the

manufacturer of the system and/or transmitters. It places the responsibility for the safe

deployment and use of these systems on the installer and/or operating organization. It places

the responsibility for adherence to safety instructions during installation and service

operations on the installation and service organizations as appropriate, and during operation

and maintenance functions on the operating organization. It is recognized that the user of this

document may fall into one or more of the categories of manufacturer, installer, service

organization and/or operating organization as mentioned above.

This document does not apply to a laser product if classification by the manufacturer

according to IEC 60825-1 shows that the emission level does not exceed the accessible

emission limit (AEL) of Class 1 under all conditions of operation, maintenance, service and

reasonably foreseeable failure.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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.
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SIST EN IEC 60825-12:2019
IEC 60825-12:2019 © IEC 2019 – 7 –

IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements

IEC 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication systems

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
access level
potential hazard at any accessible position associated with a free space optical
communication system (FSOCS) installation

Note 1 to entry: The access level is based on the level of optical radiation which could become accessible in

reasonably foreseeable circumstances, e.g. walking into an open beam path. It is closely related to the laser

classification procedure in IEC 60825-1.

Note 2 to entry: Practically speaking, it takes two or more seconds to fully align an optical aid with a beam (which

might occur in an unrestricted location), and this delay is incorporated into the method for determining access level.

3.2
access level 1

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits (AEL) of Class 1 for the applicable wavelengths

and emission duration will not occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 1 laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

3.3
access level 1M

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits (AEL) of Class 1M for the applicable wavelengths

and emission duration will not occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 1M laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

Note 2 to entry: If the applicable limit of access level 1M is larger than the limit of 3R and less than the limit of 3B,

access level 1M is allocated.
3.4
access level 2

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits of Class 2 for the applicable wavelengths and

emission duration will not occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 2 laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

3.5
access level 2M

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits of Class 2M for the applicable wavelengths and

emission duration will not occur
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SIST EN IEC 60825-12:2019
– 8 – IEC 60825-12:2019 © IEC 2019

Note 1 to entry: The level of radiation is measured with the conditions for Class 2M laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

Note 2 to entry: If the applicable limit of access level 2M is larger than the limit of 3R and less than the limit of 3B,

access level 2M is allocated.
3.6
access level 3R

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits of Class 3R for the applicable wavelengths and

emission duration will not occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 3R laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

Note 2 to entry: If the applicable limit of access level 1M or 2M is larger than the limit of 3R and less than the limit

of 3B, access level 1M or 2M is allocated.
3.7
access level 3B

level for which, under reasonably foreseeable circumstances, human access to laser radiation

in excess of the accessible emission limits of Class 3B for the applicable wavelengths and

emission duration will not occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 3B laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

3.8
access level 4

level for which, under reasonably foreseeable circumstances, it is possible that human access

to laser radiation in excess of the accessible emission limits of Class 3B for the applicable

wavelengths and emission duration could occur

Note 1 to entry: The level of radiation is measured with the conditions for Class 4 laser products

(see IEC 60825-1), but with Condition 2 and C being as defined in 4.2.3 of this document (IEC 60825-12).

3.9
automatic power reduction
APR

feature of a transmitter of an FSOCS, provided by the system equipment manufacturer, by

which the accessible power in the nominal hazard zone (NHZ) or extended nominal hazard

zone (ENHZ) is reduced to a specified value within a specified time

Note 1 to entry: The term “automatic power reduction” (APR) used in this document encompasses the following

terms used in recommendations of the International Telecommunication Union ITU:
• automatic laser shutdown (ALS);
• automatic power reduction (APR);
• automatic power shutdown (APSD).

Note 2 to entry: The accessible power in the NHZ or ENHZ is reduced to a specified value within a specified time,

whenever there is an event which could result in human exposure to optical radiation above the maximum

permissible exposure (MPE), e.g. by a person entering the NHZ or ENHZ, as applicable. In an FSOCS, this feature

may be used by the transmitter manufacturer to determine the classification.
3.10
beacon

optical source whose function is to aid in pointing or alignment of an optical system

3.11
end-to-end system

FSOCS that is comprised of at least one transmitter, one receiver, and any peripheral

hardware necessary for the effective transfer of data along the transmission path from one

position in space to another
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SIST EN IEC 60825-12:2019
IEC 60825-12:2019 © IEC 2019 – 9 –
3.12
extended nominal hazard zone
ENHZ

volume within which, when optical aids are used, the level of the direct, reflected or scattered

radiation exceeds the applicable maximum permissible exposure (MPE) (under measurement

conditions indicated in IEC 60825-1)

Note 1 to entry: Exposure levels outside the boundary of the ENHZ are below the applicable MPE when optical

aids are used.

Note 2 to entry: This volume is determined prior to activation of any IPS or APR systems unless the APR is used

for classification under the conditions of 4.5 of this document.
3.13
free space optical communication system
FSOCS

installed, portable, or temporarily mounted, through-the-air system typically used, intended or

promoted for voice, data or multimedia communications and/or control purposes via the use of

modulated optical radiation produced by a laser

Note 1 to entry: “Free space” means indoor and outdoor optical wireless applications with both non-directed and

directed transmission.
Note 2 to entry: Emitting and detecting assemblies may or may not be separated.

Note 3 to entry: Refer to the conditions within Clause 1, by which Class 1 FSOCS products are exempt from all

requirements of this document.
3.14
FSOCS transmitter
transmitter
optical transmitter emitting radiation through the air and used in an FSOCS
3.15
installation organization
installer
organization or individual who is responsible for the installation of an FSOCS
3.16
installation protection system
IPS

feature of an installation site, provided by the installer or operating organization, that has two

functions: (1) it detects human entry into the accessible volume of either the NHZ for

restricted or controlled locations or the ENHZ for an unrestricted location, and (2) once such

entry is detected, causes reduction of the accessible power of the laser to a specified level

within a specified time
3.17
interlock

means either of preventing access to a hazardous location until the hazard is removed, or of

automatically removing the hazardous condition when access is gained
3.18
location
position or site occupied or available for occupancy

Note 1 to entry: Other standards may use the same terms for location types (3.19 to 3.22) with somewhat

...

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