EN 60825-4:2006/A1:2008

SLOVENSKI STANDARD
01-december-2008
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Safety of laser products - Part 4: Laser guards (IEC 60825-4:2006/A1:2008)
Sicherheit von Lasereinrichtungen - Teil 4: Laserschutzwände (IEC 60825-
4:2006/A1:2008)
Sécurité des appareils à laser - Partie 4: Protecteurs pour lasers ( (CEI 60825-
4:2006/A1:2008))
Ta slovenski standard je istoveten z: EN 60825-4:2006/A1:2008
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60825-4/A1
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 31.260
English version
Safety of laser products -
Part 4: Laser guards
(IEC 60825-4:2006/A1:2008)
Sécurité des appareils à laser -  Sicherheit von Lasereinrichtungen -
Partie 4: Protecteurs pour lasers Teil 4: Laserschutzwände
(CEI 60825-4:2006/A1:2008) (IEC 60825-4:2006/A1:2008)

This amendment A1 modifies the European Standard EN 60825-4:2006; it was approved by CENELEC on 2008-
09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
the conditions for giving this amendment 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 amendment 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

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60825-4:2006/A1:2008 E

Foreword
The text of document 76/383/FDIS, future amendment 1 to IEC 60825-4:2006, prepared by IEC TC 76,
Optical radiation safety and laser equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as amendment A1 to EN 60825-4:2006 on 2008-09-01.
The following dates were fixed:
– latest date by which the amendment has to be
implemented at national level by publication of
an identical national standard or by endorsement (dop) 2009-06-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2011-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of amendment 1:2008 to the International Standard IEC 60825-4:2006 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________
- 3 - EN 60825-4:2006/A1:2008
Replace Annex ZA of EN 60825-4:2006 by:

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 60825-1 2007 Safety of laser products - EN 60825-1 2007
Part 1: Equipment classification and
requirements
ISO 11553-1 2005 Safety of machinery - Laser processing EN ISO 11553-1 2005
machines -
Part 1: General safety requirements

ISO 12100-1 2003 Safety of machinery - Basic concepts, EN ISO 12100-1 2003
general principles for design -
Part 1: Basic terminology, methodology

ISO 12100-2 2003 Safety of machinery - Basic concepts, EN ISO 12100-2 2003
general principles for design -
Part 2: Technical principles
ISO 13849-1 2006 Safety of machinery - Safety-related parts of EN ISO 13849-1 2008
control systems -
Part 1: General principles for design

ISO 14121-1 2007 Safety of machinery - Risk assessment - EN ISO 14121-1 2007
Part 1: Principles
IEC 60825-4
Edition 2.0 2008-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Safety of laser products –
Part 4: Laser guards
Sécurité des appareils à laser –
Partie 4: Protecteurs pour lasers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
M
CODE PRIX
ICS 31.260 ISBN 2-8318-9825-0
– 2 – 60825-4 Amend. 1 © IEC:2008
FOREWORD
This amendment has been prepared by IEC technical committee 76: Optical radiation safety
and laser equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
76/383/FDIS 76/385/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication.
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Page 3
CONTENTS
Add the title of Annex G as follows:
Annex G (normative) Beam delivery systems
Page 15
2 Normative references
Replace the reference to IEC 60825-1 by the following new reference:
IEC 60825-1:2007, Safety of laser products – Part 1: Equipment classification and
requirements
Add the following two new references:
ISO 14121-1:2007, Safety of machinery – Risk assessment – Part 1: Principles
ISO 13849-1:2006, Safety of machinery – Safety-related parts of control systems – Part 1:
General principles for design
Page 131
Add, after Annex F, the new Annex G as follows:

60825-4 Amend. 1 © IEC:2008 – 3 –
Annex G
(normative)
Beam delivery systems
G.1 General
This normative annex addresses the arrangement, installation and use of guided beam
delivery systems. Laser beams can be propagated through air, gas or vacuum, whether
enclosed or not (free space), and through fibre optic cables in laser processing machine
applications.
This annex applies to the protective measures implemented to protect personnel against laser
radiation hazards for guided beam delivery systems after the output coupler and/or the
protective housing of the laser product (the requirements of which are specified in IEC 60825-
1).This annex is intended to compliment the requirements applicable to the laser process
enclosure (which are specified in this document and in ISO 11553-1). This annex also
provides methods for assessing the risks (including reasonably foreseeable use, abuse and
misuse) and provides examples of control measures to meet the normative requirements of
IEC 60825-1 and this document.
This annex does not apply to beam delivery systems inside the protective housing of the
laser.
This annex does not apply to beam delivery systems used in medical or communications
applications.
G.2 Terms and definitions
For the purposes of this annex, the following definitions apply. They are in addition to those
given in IEC 60825-1 or other parts of IEC 60825.
G.2.1
access panel
any panel which when removed or displaced gives human access to laser radiation. Sheathing
around a fibre, tubing used as an enclosure component or any device serving the function of a
removable or displaceable panel, can also be an "access panel" within the terms of this
definition
G.2.2
beam delivery system
system comprised of all those components, including all optical beam components and
potential beam paths and their enclosures, which when combined, transfer laser radiation
emitted from the laser radiation generator (the laser) to the workpiece. These components
may include all elements for guiding, shaping and switching the laser beam as well as the
enclosure of and support for the beam path components
G.2.3
beam path components
those optical components which lie on a defined beam path (see 3.16 of IEC 60825-1)
NOTE Examples of a beam path component include a beam steering mirror, a focus lens or a fibre optic cable
connector.
– 4 – 60825-4 Amend. 1 © IEC:2008
G.2.4
beam shaping components
those optical components introduced in the beam path to transform the profile or cross-
section of the laser beam by means of apertures, reflective, refractive or diffractive optical
components
G.2.5
beam switching components
those optical components or an assembly of components introduced in the beam path to
direct or divert, under external control, the beam path along predetermined direction(s). The
external control allows the beam path to be switched from one predetermined direction to
another
G.2.6
fibre optic cable
optical beam guiding component that enables the transmission of laser radiation along a
transparent medium. A fibre optic cable may have a glass or other core that carries the laser
radiation and be surrounded by cladding. The outside of the fibre is protected by cladding and
may be further protected by additional layers of other material such as a polymer or a metal to
protect the fibre from mechanical deformation, the ingress of water, etc. For this annex, this
term also includes other forms of transmission devices such as waveguides
G.3 General requirements
G.3.1 General considerations
The risks associated with the hazards relevant to the beam delivery systems shall be
assessed as part of the overall requirements for risk assessment of the machine. The
principles for risk assessment given in standard ISO 14121-1 shall be used in carrying out this
assessment. This assessment shall determine the acceptable level of risk and the necessary
protective measures for persons who can be exposed to those hazards, while maintaining an
acceptable level of performance of the machine.
Hazards can result from, but are not limited to, the following causes:
• failures, faults or damage in the protective housing or other mechanical protective
measures incorporated in the beam delivery system resulting in the inadvertent emission
of laser radiation from the protective housing;
• failures or faults in the beam path components resulting in damage to the protective
housing or other protective devices;
• failures or faults in the associated equipment or controls resulting in injury or malfunction
or failure of the safety functions of the laser processing machine;
• failures or faults from reasonably foreseeable misuse or abuse resulting in the inadvertent
emission of laser radiation from the protective housings.
The engineering and administrative controls adopted are a combination of the measures
incorporated at the design stage and include those instructions to be followed by the user.
Design shall be the first consideration in the reduction of risks. Where this is not sufficient to
eliminate risks to a negligible level, additional safeguarding and safe working procedures shall
be considered.
NOTE Examples of risk assessments and potential solutions for risk reduction measures are shown in
Clause G.6.
G.3.2 Protective housing
The requirements for protective housing are specified in 4.2.1 and 4.2.2 of IEC 60825-1.

60825-4 Amend. 1 © IEC:2008 – 5 –
G.3.3 Access panels and safety interlocks for beam delivery systems using free space
transmission
The requirements for access panels and safety interlocks are specified in IEC 60825-1
Clause 4.3.
A safety interlock shall be provided for access panels of protective housings of free space
beam delivery systems that may include beam shaping and beam switching components
when:
a) The access panel is intended to be removed or displaced during maintenance or operation
of the laser processing machine, and
b) The removal of the panel gives access to laser radiation levels designated by “X” in Table
1 of IEC 60825-1.
The safety interlock shall be part of a design that prevents the removal of the panel until the
accessible emission levels are below the AEL defined above. Inadvertent resetting of the
interlock shall not in itself restore emission values above the limits specified above.
If a deliberate override mechanism is provided, the requirements of 4.3.2 of IEC 60825-1 shall
apply.
All safety interlocks, safety monitoring devices or associated safety-related control circuits
shall meet the requirements specified in ISO 12100-2 and ISO 13849-1 with respect to the
general requirements for guards together with the requirements related to interlock devices
and safety monitoring devices and their application in safety-related control circuits.
G.3.4 Safety interlocks for beam delivery systems using fibre optic cables or other
beam waveguides
Removal or displacement of a fibre optic cable (or other form of beam waveguide) in a beam
delivery system shall be allowable only under at least one of the following conditions.
a) With the use of a key or tool at the point of connection to allow access, removal or
displacement of the fibre optic cable by skilled or trained persons.
b) With the prevention of emission from the fibre optic cable by the termination of emission
from the laser prior to access to the fibre optical cable end on the removal or
displacement of the fibre optic cable. This may be accomplished by the use of interlocks
at the interfaces that can be displaced.
c) Removal or displacement of the fibre optic cable without the use of a key or special tool
and without the termination of laser radiation emission from the laser shall be possible
only when other protective measures are provided to ensure that personnel are not
exposed to laser radiation that will cause injury. These protective measures shall be
clearly described in the user instructions together with the necessary procedures for their
use.
When a safety interlock is used, removal of the protective housing shall not permit human
access to accessible emission levels above the applicable AEL in Table 1 of IEC 60825-1.
Inadvertent resetting of the interlock shall not in itself restore emission values above the
applicable AEL in Table 1 of IEC 60825-1. These interlocks shall be failsafe or redundant and
conform to the requirements in the applicable IEC product standard.
If a deliberate override mechanism is provided, the requirements of 4.3.2 of IEC 60825-1 shall
apply.
All safety interlocks, safety monitoring devices or associated safety-related control circuits
shall meet the requirements sp
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