FprEN IEC 60825-12:2022

SLOVENSKI STANDARD
oSIST prEN IEC 60825-12:2022
01-januar-2022
Varnost laserskih izdelkov - 12. del: Varnost optičnih komunikacijskih sistemov v
prostem prostoru, ki se uporabljajo za prenos informacij
Safety of laser products - Part 12: Safety of free space optical communication systems
used for transmission of information
Sicherheit von Lasereinrichtungen - Teil 12: Sicherheit von optischen
Freiraumkommunikationssystemen für die Informationsübertragung
Sécurité des appareils à laser - Partie 12 : Sécurité des systèmes de communication
optiques en espace libre utilisés pour la transmission d'informations
Ta slovenski standard je istoveten z: prEN IEC 60825-12:2021
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
oSIST prEN IEC 60825-12:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60825-12:2022
oSIST prEN IEC 60825-12:2022
76/687/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60825-12 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-11-05 2022-01-28
SUPERSEDES DOCUMENTS:
76/655/CD, 76/663A/CC
IEC TC 76 : OPTICAL RADIATION SAFETY AND LASER EQUIPMENT
SECRETARIAT: SECRETARY:
United States of America Mr William Ertle
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 108
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.

TITLE:
Safety of laser products - Part 12: Safety of free space optical communication systems used for
transmission of information
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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2 CONTENTS
4 FOREWORD . 4
5 INTRODUCTION . 6
6 1 Scope . 7
7 2 Normative references . 7
8 3 Terms and definitions . 7
9 4 Assessment of access level . 12
10 4.1 General . 12
11 4.2 Determination of access level and the use of Condition 2 . 12
12 4.3 Access level 1 and 1M . 14
13 4.4 Access level 2 and 2M . 14
14 4.5 Access level 3R . 15
15 4.6 Access level 3B . 15
16 4.7 Access level 4 . 15
17 4.8 Time base . 15
18 5 Classification and evaluation of access level . 16
19 5.1 General . 16
20 5.2 Impact of using automatic power reduction features . 16
21 5.3 Automatic power reduction mechanisms (APR) . 16
22 5.3.1 General . 16
23 5.3.2 APR performance requirements . 17
24 5.4 Installation protection systems (IPS) . 18
25 6 Access level and classification requirements by location type . 18
26 6.1 General . 18
27 6.2 Requirements for unrestricted locations . 21
28 6.2.1 General . 21
29 6.2.2 Use of access level 1M and access level 2M FSOCS equipment in unrestricted
30 locations . 23
31 6.2.3 Use of access level 3R FSOCS equipment in unrestricted locations . 25
32 6.3 Requirements for restricted locations . 26
33 6.3.1 General . 26
34 6.3.2 Use of access level 3R FSOCS equipment in restricted locations . 26
35 6.4 Requirements for controlled locations . 27
36 6.4.1 General . 27
37 6.4.2 Use of access level 3B and access level 4 FSOCS equipment in controlled
38 locations . 28
39 6.5 Requirements for inaccessible space . 28
40 6.6 Specular reflections . 28
41 7 Organizational requirements . 29
42 7.1 Requirements for manufacturers of ready-to-use FSOCS transmitter or turn key
43 systems . 29
44 7.1.1 General . 29
45 7.1.2 Additional manufacturer’s instructions . 29
46 7.2 Installation and service organization requirements . 30

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47 7.3 Operating organization requirements . 31
48 8 Marking . 32
49 8.1 General . 32
50 8.2 Marking of aperture for transmitter . 34
51 8.3 Durability – Indelibility requirements for safety markings . 34
52 8.4 Warning for invisible radiation . 34
53 Annex A (informative) Rationale . 35
54 Annex B (informative) Clarification of the meaning of “access level” . 36
55 B.1 General . 36
56 B.2 Class . 36
57 B.3 Access level . 36
58 Annex C (informative) Examples of applications and calculations . 37
59 C.1 Examples of NHZ and ENHZ . 37
60 C.2 Viewing a specular (mirror-like) reflection . 39
61 C.3 Example of divergent, diffuse IR transmitter . 39
62 C.4 FSOCS link between two restricted locations . 40
63 C.5 Unmanned Aerial System (UAS) . 43
64 Annex D (informative) Methods of hazard/safety analysis . 47
65 Annex E (informative) Guidance for installing, servicing and operating organizations . 48
66 E.1 Working practices for FSOCSs. 48
67 E.1.1 General . 48
68 E.1.2 General working practices . 48
69 E.1.3 Additional working practices for Class/access level 1M, 2M, 3R, 3B and 4
70 systems . 48
71 E.2 Education and training . 49
72 Bibliography . 50
74 Figure 1 – Commercial structures . 19
75 Figure 2 – Residential areas . 20
76 Figure 3 – Examples of external location types . 22
77 Figure 4 – Access level 1M or 2M transmitter near edge of unrestricted rooftop . 24
78 Figure 5 – Access level 1M transmitter in unrestricted location . 25
79 Figure 6 – Access level 3R transmitter in restricted location . 27
80 Figure C.1 Link between two widely separated locations . 41
81 Figure C.2 Unmanned Aerial System with FSOCS . 44
82 Figure C.3 Grounded FSOCS installed to the ground . 45
83 Figure C.4 Grounded FSOCS installed to the controlled location . 45
85 Table 1 – Measurement aperture diameters and distances for the default (simplified)
86 evaluation . 13
87 Table 2 – Restrictions for the use of FSOCS based on their access levels . 21
88 Table 2 – Requirements for warning signs . 31
89 Table 4 – Marking requirements . 33
90 Table. C.1 Allowed access levels and installation requirements . 46

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91 INTERNATIONAL ELECTROTECHNICAL COMMISSION
92 ____________
94 SAFETY OF LASER PRODUCTS –
96 Part 12: Safety of free space optical communication systems
97 used for transmission of information
99 FOREWORD
100 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
101 electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all
102 questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities,
103 IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS)
104 and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC
105 National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental
106 and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with
107 the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between
108 the two organizations.
109 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus
110 of opinion on the relevant subjects since each technical committee has representation from all interested IEC National
111 Committees.
112 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in
113 that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC
114 cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.
115 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to
116 the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and
117 the corresponding national or regional publication shall be clearly indicated in the latter.
118 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment
119 services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by
120 independent certification bodies.
121 6) All users should ensure that they have the latest edition of this document.
122 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of
123 its technical committees and IEC National Committees for any personal injury, property damage or other damage of any
124 nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication,
125 use of, or reliance upon, this IEC Publication or any other IEC Publications.
126 8) Attention is drawn to the Normative references cited in this document. Use of the referenced publications is indispensable
127 for the correct application of this document.
128 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights.
129 IEC shall not be held responsible for identifying any or all such patent rights.
130 International Standard IEC 60825-12 has been prepared by IEC technical committee 76: Optical
131 radiation safety and laser equipment.
132 This third edition cancels and replaces the Ed 2.0 published in 2019, and constitutes a technical revision.
133 This third edition includes the following significant technical changes with respect to the previous edition
134 2.0:
135 a) Where relevant and appropriate references to IEC 60825-1 have been changed to a specific dated
136 reference i.e. IEC 60825-1: 2014.
137 b) Condition 2 has been changed from 7 mm aperture stop and 70 mm distance to,
138 - For wavelengths less than 1 400 nm, 3,5 mm aperture stop and 35 mm distance,
139 - For wavelengths equal to or greater than 1 400 nm, 3,5 mm aperture stop and 14 mm distance.
140 c) For wavelengths between 1 200 nm and 1 400 nm, an additional limitation is required equal to the
141 equivalent radiant power of the skin MPE. C7 has therefore been revised in accordance with IEC
142 60825-1:2014, but with this additional limitation related to the skin MPE; see 4.2.
143 d) Additional detail added regarding time base, see 4.8.

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144 e) Additional clarification added to Clause 8 regarding the content and formatting of labels.
145 f) Annex A has been added, providing a rationale for the differences in approach between this
146 document and IEC 60825-1:2014.
147 g) Annex B has been added, providing clarification of the meaning of the term “access level”.
148 h) Worked examples have been added for a variety of scenarios, see annexes C.1 to C.4.
149 i) Annex C.5 has been added on UAS, unmanned aerial systems.
151 The text of this document is based on the following documents:
FDIS Report on voting
76/XX/FDIS 76/XX/RVD
153 Full information on the voting for the approval of this document can be found in the report on voting
154 indicated in the above table.
155 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
156 The list of all parts of the IEC 60825 series, published under the title Safety of laser products, can be
157 found on the IEC website.
158 The committee has decided that the contents of this document will remain unchanged until the stability
159 date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific
160 document. At this date, the document will be
161 • reconfirmed,
162 • withdrawn,
163 • replaced by a revised edition, or
164 • amended.
166 The National Committees are requested to note that for this document the stability date is 2024.
167 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE DELETED AT THE
168 PUBLICATION STAGE.
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171 INTRODUCTION
172 The objective of this document is to:
173  protect people from optical radiation emitted by FSOCSs;
174  safety requirements and guidance for the design, manufacture and use of laser products or laser
175 systems, which emit laser radiation for the purpose of free space optical data transmission;
176  guidance for installation, operation, maintenance and service to assure the safe deployment and
177 use of such laser systems.
178 This document only addresses the open beam portion of the laser product or laser system.
179 This document places the responsibility for certain product safety requirements, as well as requirements
180 for providing appropriate information on how to use these systems safely, on the manufacturer of the
181 system or the transmitters. It places the responsibility for the safe deployment and use of these systems
182 on the installer or the operating organization. It places the responsibility for adherence to safety
183 instructions during installation and service operations on the installation and service organizations as
184 appropriate, and during operation and maintenance functions on the operating organization. It is
185 recognized that the user of this document may fall into one or more of the categories of manufacturer,
186 installer, service organization and/or operating organization as mentioned above.
187 Annex A gives a more detailed rationale for this document, and some examples are given in Annex C.
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189 SAFETY OF LASER PRODUCTS –
191 Part 12: Safety of free space optical communication systems
192 used for transmission of information
194 1 Scope
195 This document is applicable to products that emit laser radiation for the purpose of free space optical
196 data transmission.
197 This document does not apply to laser products designed for the purposes of transmitting optical power
198 for applications such as material processing or medical treatment. This document also does not apply
199 to the use of laser products in explosive atmospheres (see IEC 60079-0). Light-emitting diodes
200 employed by free space optical communication systems, used for the purpose of free space optical data
201 transmission, do not fall into the scope of this document.
202 NOTE If the laser product incorporates an optical fibre that extends from the confinements of the enclosure, the requirements
203 in IEC 60825-2 applies.
204 2 Normative references
205 The following documents are referred to in the text such a way that some or all of their content
206 constitutes requirement of this document. For dated references, only the edition cited applies. For
207 undated references, the latest edition of the referenced document (including any amendments) applies.
208 IEC 60825-1:2014, Safety of laser products – Part 1: Equipment classification and requirements
209 IEC 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication systems
210 3 Terms and definitions
211 For the purposes of this document, the terms and conditions contained in IEC 60825-1:2014 as well as
212 the following terms and definitions apply.
213 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
215  IEC Electropedia: available at http://www.electropedia.org/
216  ISO Online browsing platform: available at http://www.iso.org/obp
218 3.1
219 access level
220 potential hazard at any accessible position associated with a free space optical communication system
221 (FSOCS) installation
222 Note 1 to entry: The access level is based on the level of laser radiation which could become accessible in reasonably
223 foreseeable circumstances, e.g. walking into an open beam path. It is closely related to the laser classification procedure in
224 IEC 60825-1. The meaning of access level is clarified in Annex B.
225 Note 2 to entry: Practically speaking, it takes two or more seconds to fully align an optical aid with a beam (which might occur
226 in an unrestricted location), and this delay is incorporated into the method for determining access level.
227 3.2
228 access level 1
229 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
230 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
231 for access level 1 as defined in Clause 4 of this document, will not exceed the accessible emission limits
232 of Class 1 for the applicable wavelengths and emission duration, with additional constraints as defined
233 4.3
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234 Note 1 to entry: The “additional constraints” mentioned above refer to additional and stricter constraints that 4.3 of this
235 document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in the wavelength
236 range 1 200 to 1 400 nm.
237 3.3
238 access level 1M
239 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
240 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
241 for access level 1M as defined in Clause 4 of this document, will not exceed the accessible emission
242 limits of Class 1 for the applicable wavelengths and emission, with additional constraints as defined 4.3
243 Note 1 to entry: The “additional constraints” mentioned above refer to additional and stricter constraints that 4.3 of this
244 document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in the wavelength
245 range 1 200 to 1 400 nm.
246 3.4
247 access level 2
248 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
249 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
250 for access level 2 as defined in Clause 4 of this document, will not exceed the accessible emission limits
251 of Class 2 for the applicable wavelengths and emission duration, with additional constraints as defined
252 4.4
253 3.5
254 access level 2M
255 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
256 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
257 for access level 2M as defined in Clause 4 of this document, will not exceed the accessible emission
258 limits of Class 2 for the applicable wavelengths and emission duration, with additional constraint as
259 defined 4.4
260 3.6
261 access level 3R
262 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
263 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
264 for access level 3R as defined in Clause 4 of this document, will not exceed the accessible emission
265 limits of Class 3R for the applicable wavelengths and emission duration, with additional constraints as
266 defined 4.5
267 Note 1 to entry: The “additional constraints” mentioned above refer to additional and stricter constraints that 4.2.2.4 of this
268 document places on the values specified in IEC 60825-1:2014 for the accessible emission limits of Class 1 in the wavelength
269 range 1 200 to 1 400 nm.
270 3.7
271 access level 3B
272 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
273 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
274 for access level 3B as defined in Clause 4 of this document, will not exceed the accessible emission
275 limits of Class 3B for the applicable wavelengths and emission duration
276 3.8
277 access level 4
278 assigned hazard at any accessible location within a FSOCS at which, under any reasonably foreseeable
279 event, human access to laser radiation (accessible emission), evaluated by the measurement conditions
280 for access level 4 as defined in Clause 4 of this document, will exceed the accessible emission limits of
281 Class 3B for the applicable wavelengths and emission duration
282 Note 1 to entry: This document is applicable for the operation and maintenance of FSOCS. In order to achieve an adequate
283 level of safety for persons who may come into contact with the optical transmission path, access level 4 is not permitted within
284 this document. It is permitted to use protection systems, such as automatic power reduction (APR, see 3.10) or installation
285 protection system (IPS: see 3.18), to achieve the required access level where the transmitted power under any operating
286 conditions (e.g. normal and fault operation) exceeds that permitted for a particular location type. For instance, it is possible for
287 accessible parts of an FSOCS to be access level 1 even though the power transmitted down the free space under normal
288 operating conditions is Class 4.

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289 3.9
290 aperture for transmitter
291 aperture portion of FSOCS through which the beam for transmission is emitted
292 3.10
293 automatic power reduction
294 APR
295 feature of a transmitter of an FSOCS, provided by the system equipment manufacturer, by which the
296 accessible power in the nominal hazard zone (NHZ) or extended nominal hazard zone (ENHZ) is
297 reduced to a specified value within a specified time
298 Note 1 to entry: The term “automatic power reduction” (APR) used in this document encompasses the following terms used
299 in recommendations of the International Telecommunication Union ITU Recommendation G.664:
300  automatic laser shutdown (ALS);
301  automatic power reduction (APR);
302  automatic power shutdown (APSD).
303 Note 2 to entry: The accessible power in the NHZ or ENHZ is reduced to a specified value within a specified time, whenever
304 there is an event which could result in human exposure to optical radiation above the maximum permissible exposure (MPE),
305 e.g. by a person entering the NHZ or ENHZ, as applicable. In an FSOCS, this feature may be used by the transmitter
306 manufacturer to determine the classification.
307 3.11
308 beacon
309 optical source whose function is to aid in pointing or alignment of an optical system
310 3.12
311 end-to-end system
312 FSOCS that is comprised of at least one transmitter, one receiver, and any peripheral hardware
313 necessary for the effective transfer of data along the transmission path from one position in space to
314 another
315 3.13
316 extended nominal hazard zone
317 ENHZ
318 volume within which, when optical aids are used, the level of eye exposure to direct, reflected or
319 scattered radiation exceeds the applicable maximum permissible exposure (MPE) as defined in
320 IEC 60825-1:2014
321 Note 1 to entry: Exposure levels outside the boundary of the ENHZ are below the applicable MPE when optical aids are used.
322 Note 2 to entry: This volume is determined prior to activation of any IPS or APR systems unless the APR is used for
323 classification under the conditions of 5 of this document.
324 3.14
325 free space optical communication system
326 FSOCS
327 installed, portable, or temporarily mounted, through-the-air system typically used, intended or promoted
328 for voice, data or multimedia communications and/or control purposes via the use of FSOC transmitter
329 Note 1 to entry: “Free space” means indoor and outdoor optical wireless applications with both non-directed and directed
330 transmission.
331 Note 2 to entry: Emitting and detecting assemblies may or may not be separated.
332 3.15
333 FSOC transmitter
334 transmitter
335 optical transmitter emitting radiation through the air and used in an FSOCS
336 3.16
337 human access
338 a) ability of the human body to meet laser radiation emitted by the laser product, i.e. radiation that can
339 be intercepted outside of the protective housing, or

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340 b) ability of a cylindrical probe with a diameter of 100 mm and a length of 100 mm to intercept levels
341 of radiation of Class 3B and below, or
342 c) ability of a human hand or arm to intercept levels of radiation above the AEL of Class 3B,
343 d) also, for levels of radiation within the protective housing that are equivalent to Class 3B or Class 4,
344 ability of any part of the human body to meet hazardous laser radiation that can be reflected directly
345 by any single introduced flat surface from the interior of the product through any opening in its
346 protective housing
347 Note 1 to entry: For laser products that provide walk-in access, it is necessary to consider radiation both inside and outside of
348 the protective housing for the determination of human access. Human access inside the protective housing can be prevented
349 by engineering controls such as automatic detection systems.
351 3.17
352 installation organization
353 installer
354 organization or individual who is responsible for the installation of an FSOCS
355 3.18
356 installation protection system
357 IPS
358 feature of an installation site, provided by the installer or operating organization, that has two functions:
359 (1) it detects human entry into the accessible volume of either the NHZ for restricted or controlled
360 locations or the ENHZ for an unrestricted location, and (2) once such entry is detected, causes reduction
361 of the accessible power of the laser to a specified level within a specified time
362 3.19
363 interlock
364 means either of preventing access to a hazardous location until the hazard is removed, or of
365 automatically removing the hazardous condition when access is gained
366 3.20
367 location
368 position or site occupied or available for occupancy
369 Note 1 to entry: Other standards may use the same terms for location types (3.21 το 3.24) with somewhat different definitions.
370 3.21
371 location of inaccessible space
372 inaccessible space
373 volume where a person cannot normally be located, i.e. the space that has a horizontal spacing more
374 than 2,5 m from any unrestricted location and is both greater than 6 m above a surface in any
375 unrestricted location, and more than 3 m above a surface in any restricted location
376 Note 1 to entry: Inaccessible space may be entered by, for example, aircraft.
377 Note 2 to entry: All open space that is neither an unrestricted, restricted nor controlled location.
378 3.22
379 location with controlled access
380 controlled location
381 location where an engineering and administrative control measure is present to make it inaccessible
382 except to authorized personnel with appropriate laser safety training
383 3.23
384 location with restricted access
385 restricted location
386 location that is normally inaccessible to the general public (including workers, visitors, and residents in
387 the immediate vicinity) by means of any administrative or engineering control measure but that is
388 accessible to authorized personnel (e.g. maintenance or service personnel including window cleaners
389 in exterior locations) who may not have laser safety training

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390 3.24
391 location with unrestricted access
392 unrestricted location
393 location where access to the transmission/receiver equipment and open beam is not limited (accessible
394 to the general public)
395 3.25
396 manufacturer
397 organization or individual who makes or assembles optical devices and other components for the
398 construction or modification of an FSOCS
399 3.26
400 nominal hazard zone
401 NHZ
402 volume within which the level of eye exposure to direct, reflected or scattered radiation exceeds the
403 applicable maximum permissible exposure (MPE) as defined in IEC 60825-1.
404 Note 1 to entry: Exposure levels outside the boundary of the NHZ are below the applicable MPE.
405 Note 2 to entry: This volume is determined prior to activation of any IPS or APR systems unless the APR is used for
406 classification under the conditions of Clause 5 of this document.
407 3.27
408 operating organization
409 operator
410 organization or individual who is responsible for the operation and maintenance of an FSOCS
411 3.28
412 optically-aided viewing
413 use of optical aids (for example, binoculars or magnifiers) to view an emitting source from within the
414 emitted beam
415 Note 1 to entry: It is possible that telescopic optics, including binoculars, could increase the hazard to the eye by intrabeam
416 viewing of a collimated beam when viewed at a distance.
417 3.29
418 removable laser system
419 laser system that can be removed from its protective housing and operated by simply plugging into
420 electrical mains or connection to a battery
421 3.30
422 primary beam
423 beam that transmits the modulated data signal
424 3.31
425 reasonably foreseeable event
426 event (or condition) that is credible and whose likelihood of occurrence (or existence) cannot be
427 disregarded
428 3.32
429 service organization
430 organization or individual who is responsible for the service of an FSOCS
431 Note 1 to entry: The term service is defined in 3.79 of IEC 60825-1:2014.
432 3.33
433 special tool
434 tool that is not readily available at retail consumer hardware stores
435 Note 1 to entry: Typical tools in this category are intended for use with tamper-resistant fasteners.
436 3.34
437 spillover
438 beam radiant energy that propagates past the receiving terminal

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439 3.35
440 time base
441 emission duration to be considered for determination of access level
442 3.36
443 without optical aids
444 optically unaided
445 without using magnifiers or other optical aids, as with the naked eye
446 Note 1 to entry: Prescription eyeglasses and contact lenses are not considered optical aids.
447 4 Assessment of access level
448 4.1 General
449 For FSOC transmitter shall comply with the applicable requirement of IEC 60825-1:2014.
450 If an FSOCS incorporates a removable laser system, that removable laser system shall comply with the
451 applicable requirements of IEC 60825-1.
452 FSOCSs have limitations imposed by this document that are dependent on the location type(s) in which
453 they are installed. Product classification and access level restrictions by location type are summarized
454 in Table 2.
455 For each location where emission is transmitted, crosses or is received, respective exposure conditions
456 shall be individually evaluated. Furthermore, potentially occupied locations along the beam path, within
457 the NHZ or ENHZ, shall also be evaluated for acceptable access levels (Table 2) and appropriate
458 controls applied. Locations traversed by partial reflections from windows within the beam path shall also
459 be evaluated if the emission could exceed access level 1 or 2. At a given location, the installation and
460 operational constraints applied from Clause 6 shall be determined by whichever is the more hazardous:
461 the transmitted or the received optical radiation.
462 Determination of access levels is the ultimate responsibility of the manufacturer and the operating
463 organization. However, they may be determined by the maintenance, installation or service organization.
464 The methods for determining compliance with an access level are the same as those described for
465 classification in IEC 60825-1 except for the following.
466 a) The access level within a designated location shall be determined at any position relative to an
467 FSOCS transmitter where the access level is maximized, and could depend on intermediate system
468 elements such as windows.
469 b) The access level may depend on the activation of an IPS or APR system.
470 c) If an IPS or APR system is monitoring the location in question, it shall meet the performance
471 requirements defined in 5.3.2. Otherwise, the same method used for classification is also used for
472 determination of access level. For viewing conditions without optical aids refer to the tables of MPEs
473 in IEC 60825-1.
474 Verification testing of access levels shall be carried out under reasonably foreseeable fault conditions
475 to ensure that the APR and/or IPS, if used, is operating properly. In circumstances where it is difficult
476 to carry out direct measurements, an assessment of the access level based on calculations is
477 acceptable. Faults which result in the emission of radiation in excess of the applicable AEL for a limited
478 period only and for which it is not reasonably foreseeable that human access to the radiation will occur
479 before the product is taken out of service or adjusted down below the AEL, need not be considered.
480 4.2 Determination of access level and the use of Condition 2
481 The access level is determined by the measurement of the optical radiation that could become
482 accessible following any reasonably foreseeable event during operation and maintenance. The methods
483 for the determination of compliance with the specified radiation limit values are the same as those
484 described for classification in IEC 60825-1.
485 All three conditions shall be tested. Condition 1 and Condition 3 shall be tested according to IEC 60825-
486 1.
oSIST prEN IEC 60825-12:2022
IEC CDV 60825-12 ED 3.0 © IEC 2021 – 13 – 76/687/CDV

487 Condition 2 measurements to establish access levels shall be made with,
488  For wavelength less than 1 400 nm, 3,5 mm aperture at a distance of 35 mm
489  For wavelength equal or greater than 1 400 nm, 3,5 mm aperture at a distance of 14 mm
490 from the end of the FSOCS transmitter (this simulates a ×18 magnifier), as described in Table.1.
491 In addition to the above, if handheld device and for all wavelengths, the total emission from the FSOCS
492 transmitter for Access Level 3B systems shall not exceed the AEL of Class 3B.
493 In circumstances where it is difficult to carry out direct measurements, an assessment of access level
494 based on calculations is acceptable.
495 For an FSOCS with automatic power reduction (see 5.3.2 for APR performance requirements), the
496 access level will be determined by the accessible emission (pulse or continuous wave) after the time
497 interval of 2 s. Additionally the MPE requirement in 5.2 shall be satisfied.
498 Table 1 – Measurement aperture diameters and distances
499 for the default (simplified) evaluation
a
Condition 1 Condition 2 Condition 3
Applied to collimated Applicable to optical Applied to determine irradiation
beam where e.g. fibre communication relevant for the optically unaided
telescope or binoculars systems, see eye, for low power magnifiers and
may increase the hazard IEC 60825-2 for scanning beams
Applicable to free
space optical
communication
systems
b b b
Wavelength Aperture Distance Aperture Distance Aperture stop Distance
stop stop diameter
diameter diameter
nm mm mm mm mm mm mm
< 302,5 – – – – See IEC 60825-1 See IEC
60825-1
See IEC See IEC 3,5 35 See IEC 60825-1 See IEC
≥ 302,5 to < 400
60825-1 60825-1 60825-1
See IEC See IEC 3,5 35 See IEC 60825-1 See IEC
≥ 400 to < 1 400
60825-1 60825-1 60825-1
See IEC See IEC 3,5 14 See IEC 60825-1 See IEC
≥ 1 400 to < 4 000
60825-1 60825-1 60825-1
– – – – See IEC 60825-1 See IEC
≥ 4 000 to < 10
60825-1
5 6
– – – – See IEC 60825-1 See IEC
≥ 10 to < 10
60825-1
NOTE 1 The descriptions below the “Condition” headings are typical cases for information only and are not
intended to be exclusive.
NOTE 2 Limitations of the classification scheme are discussed in IEC 60825-1:2014, Clause C.3, suggesting
cases where additional risk analysis and warnings might be appropriate. Condition 2 was used in previous editions
of IEC 60825-1 as the “magnifying glass” condition.

NOTE 3 The values for Condition 1 and Condition 3 shall be taken from Table 10 in IEC 60825-1
...