Safety of machinery - Laser processing machines - Part 2: Safety requirements for hand-held laser processing devices (ISO 11553-2:2007)

This part of ISO 11553 specifies the requirements for laser processing devices, as defined in ISO 11553-1, which are hand-held or hand-operated. The purpose of this part of ISO 11553 is to draw attention to the particular hazards related to the use of hand-held laser and hand-operated laser processing devices and to prevent personal injury. This includes both the areas of hazard analysis and risk assessment as well as protective measures. Requirements concerning noise as a hazard are not included in this part of ISO 11553. These requirements are to be included in a subsequent amendment. This part of ISO 11553 does not apply to laser products or equipment manufactured solely or expressly for applications which are excluded from the scope of ISO 11553-1.

Sicherheit von Maschinen - Laserbearbeitungsmaschinen - Teil 2: Sicherheitsanforderungen an handgeführte Laserbearbeitungsgeräte (ISO 11553-2:2007)

Dieser Teil der ISO 11553 gilt für Anforderungen an die in ISO 11553-1 definierten Laserbearbeitungsgeräte,
die von Hand geführt oder positioniert werden.
Der Zweck dieses Teiles der ISO 11553 besteht darin, die Aufmerksamkeit auf die besonderen Gefährdungen
zu richten, die mit der Anwendung von handgeführten und handpositionierten Laserbearbeitungsgeräten
verbunden sind und Verletzungen von Personen zu verhindern. Dazu werden sowohl die Bereiche der
Gefährdungsanalyse als auch der Risikobewertung sowie Schutzmaßnahmen erfasst.
Anforderungen mit Bezug auf Lärm als Gefährdung werden in diesem Teil der ISO 11553 nicht erfasst. Diese
Anforderungen müssen in einer Änderung zu einem späteren Zeitpunkt berücksichtigt werden.
Dieser Teil der ISO 11553 ist nicht auf Laserprodukte oder Einrichtungen anwendbar, die nur oder
ausdrücklich für Anwendungen hergestellt werden, die außerhalb des Anwendungsbereichs der ISO 11553-1
liegen.

Sécurité des machines - Machines à laser - Partie 2: Exigences de sécurité pour dispositifs de traitement laser portatifs (ISO 11553-2:2007)

L'ISO 11553-2:2007 spécifie les exigences applicables aux dispositifs de traitement laser, tels que définis dans l'ISO 11553-1, qui sont portatifs ou actionnés manuellement.
L'objectif de l'ISO 11553-2:2007 est d'attirer l'attention sur les phénomènes dangereux particuliers associés à l'utilisation de dispositifs de traitement laser portatifs et de prévenir les blessures aux personnes. Cela inclut les domaines de l'analyse des phénomènes dangereux et l'évaluation du risque ainsi que les mesures de protection.

Varnost strojev - Laserski obdelovalni stroji - 2. del: Varnostne zahteve za ročne laserske obdelovalne naprave (ISO 11553-2:2007)

General Information

Status
Published
Publication Date
26-Jan-2009
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Jan-2009
Due Date
16-Mar-2009
Completion Date
27-Jan-2009

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherheit von Maschinen - Laserbearbeitungsmaschinen - Teil 2: Sicherheitsanforderungen an handgeführte Laserbearbeitungsgeräte (ISO 11553-2:2007)Sécurité des machines - Machines à laser - Partie 2: Exigences de sécurité pour dispositifs de traitement laser portatifs (ISO 11553-2:2007)Safety of machinery - Laser processing machines - Part 2: Safety requirements for hand-held laser processing devices (ISO 11553-2:2007)31.260Optoelektronika, laserska opremaOptoelectronics. Laser equipment13.110Varnost strojevSafety of machineryICS:Ta slovenski standard je istoveten z:EN ISO 11553-2:2008SIST EN ISO 11553-2:2009en01-marec-2009SIST EN ISO 11553-2:2009SLOVENSKI
STANDARDSIST EN ISO 11553-2:20071DGRPHãþD



SIST EN ISO 11553-2:2009



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 11553-2November 2008ICS 13.110; 31.260Supersedes EN ISO 11553-2:2007
English VersionSafety of machinery - Laser processing machines - Part 2:Safety requirements for hand-held laser processing devices(ISO 11553-2:2007)Sécurité des machines - Machines à laser - Partie 2:Exigences de sécurité pour dispositifs de traitement laserportatifs (ISO 11553-2:2007)Sicherheit von Maschinen - Laserbearbeitungsmaschinen -Teil 2: Sicherheitsanforderungen an handgeführteLaserbearbeitungsgeräte (ISO 11553-2:2007)This European Standard was approved by CEN on 7 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11553-2:2008: ESIST EN ISO 11553-2:2009



EN ISO 11553-2:2008 (E) 2 Contents Page Foreword.3 Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or other provisions of EU directives 98/37/EC.4 Annex ZB (informative)
Relationship between this
European
Standard and the Essential Requirements of EU Directive 2006/42/EC.5
SIST EN ISO 11553-2:2009



EN ISO 11553-2:2008 (E) 3 Foreword The text of ISO 11553-2:2007 has been prepared by Technical Committee ISO/TC 172 “Optics and optical instruments” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11553-2:2008 by Technical Committee CEN/TC 123 “Lasers and photonics” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 11553-2:2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directives. For relationship with EC Directives, see informative Annex ZA and Annex ZB, which are integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 11553-2:2007 has been approved by CEN as a EN ISO 11553-2:2008 without any modification.
SIST EN ISO 11553-2:2009



EN ISO 11553-2:2008 (E) 4 Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or other provisions of EU directives 98/37/EC
This European standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirement 1.5.12 of the following EU Directives: Machinery safety Directive 98/37/EC.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations. WARNING: Other requirements and other EU Directives may be applicable to the products falling within the scope of this International standard.
SIST EN ISO 11553-2:2009



EN ISO 11553-2:2008 (E) 5 Annex ZB (informative)
Relationship between this
European
Standard and the Essential Requirements of EU Directive 2006/42/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 2006/42/EC on machinery. Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the relevant Essential Requirements of that Directive, except for 1.7.3 2nd indent and 1.4.2.1 2nd paragraph, and associated EFTA regulations. WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard.
SIST EN ISO 11553-2:2009



SIST EN ISO 11553-2:2009



Reference numberISO 11553-2:2007(E)© ISO 2007
INTERNATIONAL STANDARD ISO11553-2First edition2007-03-01Corrected version2008-03-01Safety of machinery — Laser processing machines — Part 2: Safety requirements for hand-held laser processing devices Sécurité des machines — Machines à laser —
Partie 2: Exigences de sécurité pour dispositifs de traitement laser portatifs
SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
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ISO 2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
+ 41 22 749 01 11 Fax
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copyright@iso.org Web
www.iso.org Published in Switzerland
ii © ISO 2007 – All rights reserved
SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) © ISO 2007 – All rights reserved iiiContents Page Foreword.iv Introduction.v 1 Scope.1 2 Normative references.1 3 Terms and definitions.2 4 Hazards.2 4.1 Inherent hazards.2 4.2 Hazards induced by external effects (interferences).3 4.3 Further hazards related to the use of hand-held laser processing devices.4 5 Safety requirements and measures.4 5.1 General requirements.4 5.2 Risk assessment.5 5.3 Implementation of corrective measures.5 5.4 Design requirements.7 6 Verification of safety requirements and measures.11 6.1 General conformance.11 6.2 Control category classification.11 6.3 Laser classification.12 7 Information for the user.12 7.1 Additional requirements.12 7.2 Recommended inclusions.13 8 Labelling.14 Annex A (informative)
Risk assessment examples.15 Annex B (informative)
Types of hand-held laser processing machines.17 Bibliography.19
SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) iv © ISO 2007 – All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11553-2 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 9, Electro-optical systems. This first edition, together with ISO 11553-1, cancels and replaces ISO 11553:1996, which has been technically revised. ISO 11553 consists of the following parts, under the general title Safety of machinery — Laser processing machines: ⎯ Part 1: General safety requirements ⎯ Part 2: Safety requirements for hand-held laser processing devices This corrected version of ISO 11553-2:2007 now carries the logo of the International Electrotechnical Commission (IEC) as well as that of ISO. SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) © ISO 2007 – All rights reserved vIntroduction This document is a type C standard as stated in ISO 12100-1:2003. The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. It is applicable to machines using laser radiation to process materials. The purpose of this part of ISO 11553 is to prevent injuries to persons: ⎯ by listing potential hazards generated by machines containing lasers; ⎯ by specifying safety measures and verifications necessary for reducing the risk caused by specific hazardous conditions; ⎯ by providing references to pertinent standards; ⎯ by specifying the information which is to be supplied to the users so that they can establish proper procedures and precautions.
SIST EN ISO 11553-2:2009



SIST EN ISO 11553-2:2009



INTERNATIONAL STANDARD ISO 11553-2:2007(E) © ISO 2007 – All rights reserved 1Safety of machinery — Laser processing machines — Part 2: Safety requirements for hand-held laser processing devices 1 Scope This part of ISO 11553 specifies the requirements for laser processing devices, as defined in ISO 11553-1, which are hand-held or hand-operated. The purpose of this part of ISO 11553 is to draw attention to the particular hazards related to the use of hand-held laser and hand-operated laser processing devices and to prevent personal injury. This includes both the areas of hazard analysis and risk assessment as well as protective measures. Requirements concerning noise as a hazard are not included in this part of ISO 11553. These requirements are to be included in a subsequent amendment. This part of ISO 11553 does not apply to laser products or equipment manufactured solely or expressly for applications which are excluded from the scope of ISO 11553-1. 2 Normative references 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. ISO 3864-1:2002, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs in workplaces and public areas ISO 3864-2:2004, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product safety labels ISO 3864-3:2006, Graphical symbols — Safety colours and safety signs — Part 3: Design principles for graphical symbols used in safety signs ISO 11145:2006, Optics and photonics — Lasers and laser-related equipment — Vocabulary and symbols ISO 11252:2004, Lasers and laser related equipment — Laser device — Minimum requirements for documentation ISO 11553-1:2005, Safety of machinery — Laser processing machines — Part 1: General safety requirements ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part
1: Basic terminology, methodology ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principles SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) 2 © ISO 2007 – All rights reserved ISO 13849-1:1999, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design ISO 13850:1996, Safety of machinery — Emergency stop — Principles for design ISO 14118:2000, Safety of machinery — Prevention of unexpected start-up ISO 14119:1998, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection IEC 60204-1:2005, Safety of machinery — Electrical equipment of machines — Part 1: General requirements IEC 60825-1 ed. 1.2:2001, Safety of laser products — Part 1: Equipment classification, requirements and user’s guide IEC/TR 60825-14:2004; Safety of laser products — Part 14: A user's guide IEC 60825-4-am1:2002, Safety of laser products — Part 4: Laser guards 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 11145, ISO 11553-1, ISO 12100-1, IEC 60825-4 and the following apply. 3.1 hand-held laser processing device device in which a laser provides sufficient energy/power to melt, evaporate or cause a phase transition in a part of the workpiece and where the laser output or workpiece to be processed is guided manually or hand-held during the laser process NOTE For the purposes of this document, the terms “hand-held” and “hand-operated” have the same meaning. 3.2 confined spaces working areas surrounded on all sides, or for the most part, by solid walls where they, on account of their confinement or containment of materials, preparation or equipment, augment or can augment particular hazards that considerably exceed the hazard potential normally prevailing at workplaces 3.3 supply unit all devices that provide the process energies and operating material supply, direct these energies to the point of action and are absolutely necessary for the operation of the hand-held laser processing device (e.g. cooling system, power and gas supply) 3.4 disposal units equipment that captures and removes effluents and by-products during laser material processing passing these on for filtration (e.g. capture devices, pipes, filtration systems, ventilation systems) 4 Hazards 4.1 Inherent hazards The following hazards (see ISO 12100-1 and ISO 12100-2) may be generated by a laser-processing device: a) mechanical hazards; SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) © ISO 2007 – All rights reserved 3b) electrical hazards; c) thermal hazards; d) vibration hazards; e) radiation hazards; examples include: 1) hazards generated by direct or reflected laser beams, (also take into account that radiation can occur on the back of the workpiece, e.g. when cutting or due to transparency of the workpiece), 2) hazards generated by ionizing radiation, 3) hazards generated by collateral (UV, microwave, etc.) radiation produced, for example, by flash lamps, discharge tubes or RF-power sources, 4) hazards generated by secondary radiation re-emitted by targets due to beam effects (the wavelength of the re-emitted radiation may be different from that of the beam); f) hazards generated by materials and substances; examples include: 1) hazards due to products which are used in the laser-processing device (e.g. laser gases, laser dyes, solvents), 2) hazards resulting from interaction between the beam and the material (e.g. fumes, particles, vapours, debris), fire or explosion, 3) hazards from associated gases (see for example 5.4.10) used to assist laser target interactions and from any fumes that are produced; these hazards include explosion, fire, toxic effects and oxygen depletion, 4) hazards due to the leakage of liquids (e.g. coolant); g) hazards generated by neglecting ergonomic principles in the design of the laser-processing device. 4.2 Hazards induced by external effects (interferences) Power conditions and the environment in which the laser-processing device operates may cause the device to malfunction thus giving rise to hazardous conditions and/or making it necessary for someone to intervene within hazard zones. Additional environmental interferences include: a) temperature; b) humidity; c) external shock/vibration; d) vapours, dust or gases from the environment; e) electromagnetic interference; f) lightning strike; g) source voltage interruption/fluctuation; h) insufficient hardware/software compatibility and integrity; SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) 4 © ISO 2007 – All rights reserved i) hand-held laser processing devices capable of being separated from the radiation source (see also Annex B); j) non-observance of interface specification (including power limits, control signals). 4.3 Further hazards related to the use of hand-held laser processing devices 4.3.1 Confined rooms Hand-held laser processing devices could be used in confined rooms. Hazards can be constituted by: a) concentration of harmful substances in the room air; b) enrichment of process gases (nitrogen, argon, helium, oxygen) in the room air; c) oxygen depletion; d) electrical current; e) increased radiation hazard through direct as well as directly or diffusely reflected laser radiation; f) increased tripping and impact (shock) hazard. 4.3.2 Working at heights Hand-held laser processing devices may be used at heights above the ground or other load bearing surfaces. Hazards are: a) falling objects; b) fall of the user. 4.3.3 Environmental effects Hazards that can directly affect the user due to the prevailing environmental conditions. This applies in particular when hand-held laser processing machines are used outdoors. This includes the following environmental effects: a) temperature (cold, heat); b) humidity (rain, fog, hail); c) mechanical effects (vibration, wind pressure); d) electromagnetic effects (lightning strike); e) visibility (sunlight, lighting). 5 Safety requirements and measures 5.1 General requirements Machinery shall comply, as appropriate, with ISO 12100-1 or ISO 12100-2 for hazards that are not covered by this part of ISO 11553. SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) © ISO 2007 – All rights reserved 5Manufacturers shall ensure the safety of hand-held laser processing devices by: a) hazard identification and risk analysis; b) implementation of safety measures; c) verification of the implemented safety measures; d) provision of appropriate information for the user. Based on the hazard identification (see 5.2), appropriate safety measures shall be incorporated into the hand-held laser processing device by design and manufacture. The following requirements shall be satisfied: ⎯ each manufacturer shall comply with the safety requirements and measures stipulated in this clause; ⎯ the manufacturer of a hand-held laser processing device is responsible for compliance of the complete hand-held laser processing device with the requirements, including associated components (e.g. handling unit, laser assembly). These measures apply to all hazards specified in Clause 4 and reflect the results of hazard analysis and risk assessment. The information given in Annexes A and B should be taken into account. 5.2 Risk assessment A risk assessment shall be performed: a) for all phases of hand-held laser processing device ”life” (as applicable); for examples see ISO 12100-1; b) after each modification of the hand-held laser processing device by the person or organization responsible for the modification. A risk assessment involves a hazard identification, which includes but is not limited to: c) hazards listed in 4.1 and 4.3; d) danger zones, particularly those associated with 1) the laser system, 2) the laser beam path/propagation, beam delivery system, 3) the process zone, 4) interferences listed in 4.2. The results of the risk assessment shall be duly documented. 5.3 Implementation of corrective measures 5.3.1 General requirements Manufacturers shall ensure the safety of hand-held laser processing devices by: ⎯ hazard analysis and risk assessment; ⎯ integration of safety measures; SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) 6 © ISO 2007 – All rights reserved ⎯ verification of safety measures; ⎯ provision of appropriate information for the user. 5.3.2 Protection against laser radiation hazards 5.3.2.1 General The possibility of people being to exposed to levels of laser radiation exceeding the Maximum Permissible Exposure (MPE) limits for 3 × 104 exposure, as defined in standards IEC 60825-1 and IEC/TR 60825-14, shall be eliminated during operation. To satisfy this, the following requirements shall be met: a) Risk assessment shall be performed. b) Unauthorized human access to a danger zone should be prevented by engineering controls as specified in IEC 60825-1. c) If access cannot be prevented, exposure above the ocular MPE shall be eliminated by use of engineering or administrative controls, including Personal Protective Equipment. 1) The design of protective devices, such as shutters, guards, beam dissipation devices, trip devices and deterring/impeding devices shall meet the requirements specified in IEC 60825-1. In cases of ambiguity or difference of interpretation between ISO 12100-1 and ISO 12100-2 and IEC 60825-1, the first two sentences of 5.3.2.1.1, 5.3.2.1.2 and 5.3.2.1.3 of ISO 11553-1:2005 shall be definitive. 2) The same protective device may be used to provide simultaneous protection against more than one hazard. 5.3.2.2 Protection during operation The principal danger zone is usually the process zone, but the danger zone must be defined as a result of the risk assessment. The Nominal Hazard Area (NHA) as defined in IEC/TR 60825-14 or the volumetric space is where laser radiation may exceed the MPE. In the danger zone, human exposure shall be limited during operation to levels of laser radiation no greater than the MPE for 3 × 104 s exposure duration by use of engineering or administrative controls, including the use of Personal Protective Equipment (e.g. local protection using a protective enclosure or the provision of personal protective equipment) such as eyewear and clothing. 5.3.2.3 Protection during service During service procedures, human access to laser radiation exceeding the Accessible Emission limit (AEL) for Class 1 is sometimes unavoidable. During servicing it shall be ensured that only authorized persons are allowed access to zones exposed to levels of laser radiation that exceed the AEL values for Class 1. Laser-processing devices shall therefore be designed and appropriate safety measures provided, with respect to the following four situations listed in order of preference. 1) Servicing takes place outside danger zones. 2) Servicing takes place in danger zones to which access is controlled in the same manner as during production (e.g. interlocked cover). 3) Servicing takes place in a danger zone (e.g. with open guards that are normally closed during production) but accessible laser radiation does not exceed the AEL for Class 1. 4) Servicing takes place in danger zones, e.g. because opening of guards (normally closed during production) is necessary. In this case, accessible laser radiation exceeds the AEL for Class 1. SIST EN ISO 11553-2:2009



ISO 11553-2:2007(E) © ISO 2007 – All rights reserved 7The manufacturer shall indicate the class of accessible laser radiation and recommended safety procedures for each of these situations (as applicable). When servicing hand-held laser processing devices, the laser device should be switched off. For activities (e.g. adjustment), where this is not possible, a nominal ocular hazard area should be established. 5.4 Design requirements 5.4.1 Design The design of the hand-held laser processing devices shall take place according to ergonomic principles. 5.4.2 Protective enclosure The technical design requirements for
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