SIST EN ISO 14120:2016

Safety of machinery - Guards - General requirements for the design and construction of fixed and movable guards (ISO 14120:2015)

The document specifies general requirements for the design and construction of guards provided primarily to protect persons from mechanical hazards. The standard applies primary to machines which are manufactured after the date of issue of this standard.
Attention is drawn to the use of guards to minimise exposure to non-mechanical hazards. The requirements are applicable if fixed and movable guards are used. The standard does not cover those parts of guards which actuate interlocking devices. These are covered by EN 1088 (ISO 14119). This document does not provide requirements for special systems relating specifically to mobility and ability to lift loads like rollover protective structures (ROPS) and falling-object protective structures (FOPS).

Sicherheit von Maschinen - Trennende Schutzeinrichtungen - Allgemeine Anforderungen an Gestaltung und Bau von feststehenden und beweglichen trennenden Schutzeinrichtungen (ISO 14120:2015)

Diese Internationale Norm legt allgemeine Anforderungen an die Gestaltung, den Bau und die Auswahl von trennenden Schutzeinrichtungen fest, die dem Schutz von Personen vor mechanischen Gefährdungen dienen.
Diese Internationale Norm gibt weitere Gefährdungen an, die die Gestaltung und den Bau von trennenden Schutzeinrichtungen beeinflussen können.
Diese Internationale Norm gilt vorrangig für Maschinen, die nach der Veröffentlichung dieser Norm gebaut werden.
Die Anforderungen gelten beim Einsatz von feststehenden und beweglichen trennenden Schutzeinrichtungen. Diese Internationale Norm behandelt keine Verriegelungseinrichtungen. Diese werden in ISO 14119 behandelt.
Diese Internationale Norm enthält keine Anforderungen an besondere Schutzsysteme, die besonders für die Mobilität oder die Fähigkeit zum Heben von Lasten wie Überrollschutzaufbau (ROPS, en: Rollover Protective Structures) und Schutzaufbau gegen herabfallende Gegenstände (FOPS, en: Falling-Object Protective Structures) vorgesehen sind.

Sécurité des machines - Protecteurs - Prescriptions générales pour la conception et la construction des protecteurs fixes et mobiles (ISO 14120:2015)

ISO 14120:2015 spécifie les prescriptions générales pour la conception, la construction, et le choix des protecteurs destinés à la protection des personnes contre les phénomènes dangereux mécaniques.
ISO 14120:2015 indique d'autres phénomènes dangereux susceptibles d'influer sur la conception et la construction des protecteurs.
ISO 14120:2015 s'applique aux protecteurs de machines qui seront fabriquées après sa publication.
Les prescriptions sont applicables lorsque des protecteurs fixes et mobiles sont utilisés. La présente Norme internationale ne traite pas des dispositifs de verrouillage. Ceux-ci sont traités par l'ISO 14119.
ISO 14120:2015 ne donne pas de prescriptions pour les systèmes de protection spécifiques à la mobilité tels que ROPS (structures de protection au retournement), FOPS (structures de protection contre les chutes d'objets), et TOPS (structures de protection au basculement) ou à la capacité des machines à lever des charges.

Varnost strojev - Varovala - Splošne zahteve za načrtovanje in konstruiranje nepomičnih in pomičnih varoval (ISO 14120:2015)

Ta dokument določa splošne zahteve za načrtovanje in konstruiranje varoval, namenjenih predvsem zaščiti oseb pred mehanskimi tveganji. Ta standard velja predvsem za stroje, ki so bili izdelani po datumu objave tega standarda. Izpostavljena je uporaba varoval za zmanjšanje izpostavljenosti nemehanskim tveganjem. Zahteve veljajo za uporabo nepomičnih in pomičnih varoval. Standard ne zajema delov varoval, ki sprožijo zaporne naprave. Te so zajete v standardu EN 1088 (ISO 14119). Ta dokument ne podaja zahtev za posebne sisteme, ki se nanašajo zlasti na mobilnost in zmožnost dviganja bremen, kot so zaščitne strukture proti prevrnitvi (ROPS) in zaščitne strukture proti padajočim objektom (FOPS).

General Information

• Status: Published
• Public Enquiry End Date: 30-Nov-2013
• Publication Date: 21-Dec-2015
• ICS: 13.110 - Safety of machinery
• Technical Committee: VSN - Safety of machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Dec-2015
• Due Date: 14-Feb-2016
• Completion Date: 22-Dec-2015
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Ref Project: EN ISO 14120:2015 - Safety of machinery - Guards - General requirements for the design and construction of fixed and movable guards (ISO 14120:2015)

Relations

• Replaces: SIST EN 953:2000+A1:2009 - Safety of machinery - Guards - General requirements for the design and construction of fixed and movable guards
• Effective Date: 01-Feb-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 14120:2016
01-februar-2016
1DGRPHãþD
SIST EN 953:2000+A1:2009
9DUQRVWVWURMHY9DURYDOD6SORãQH]DKWHYH]DQDþUWRYDQMHLQNRQVWUXLUDQMH
QHSRPLþQLKLQSRPLþQLKYDURYDO,62
Safety of machinery - Guards - General requirements for the design and construction of
fixed and movable guards (ISO 14120:2015)
Sicherheit von Maschinen - Trennende Schutzeinrichtungen - Allgemeine Anforderungen
an Gestaltung und Bau von feststehenden und beweglichen trennenden
Schutzeinrichtungen (ISO 14120:2015)
Sécurité des machines - Protecteurs - Prescriptions générales pour la conception et la
construction des protecteurs fixes et mobiles (ISO 14120:2015)
Ta slovenski standard je istoveten z: EN ISO 14120:2015
ICS:
13.110 Varnost strojev Safety of machinery
SIST EN ISO 14120:2016 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 14120:2016

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SIST EN ISO 14120:2016


EN ISO 14120
EUROPEAN STANDARD

NORME EUROPÉENNE

November 2015
EUROPÄISCHE NORM
ICS 13.110 Supersedes EN 953:1997+A1:2009
English Version

Safety of machinery - Guards - General requirements for
the design and construction of fixed and movable guards
(ISO 14120:2015)
Sécurité des machines - Protecteurs - Prescriptions Sicherheit von Maschinen - Trennende
générales pour la conception et la construction des Schutzeinrichtungen - Allgemeine Anforderungen an
protecteurs fixes et mobiles (ISO 14120:2015) Gestaltung, Bau und Auswahl von feststehenden und
beweglichen trennenden Schutzeinrichtungen (ISO
14120:2015)
This European Standard was approved by CEN on 3 October 2015.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14120:2015 E
worldwide for CEN national Members.

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SIST EN ISO 14120:2016
EN ISO 14120:2015 (E)
Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC. 4

2

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SIST EN ISO 14120:2016
EN ISO 14120:2015 (E)
European foreword
This document (EN ISO 14120:2015) has been prepared by Technical Committee ISO/TC 199 "Safety of
machinery" in collaboration with Technical Committee CEN/TC 114 “Safety of machinery” 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 2016, and conflicting national standards shall be
withdrawn at the latest by May 2016.
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 953:1997+A1:2009.
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 EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an 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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 14120:2015 has been approved by CEN as EN ISO 14120:2015 without any modification.
3

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SIST EN ISO 14120:2016
EN ISO 14120:2015 (E)
Annex ZA
(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 Machinery 2006/42/EC.
Once this standard is cited in the Official Journal of the European Union 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 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.
4

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SIST EN ISO 14120:2016
INTERNATIONAL ISO
STANDARD 14120
Second edition
2015-11-01
Safety of machinery — Guards
— General requirements for the
design and construction of fixed and
movable guards
Sécurité des machines — Protecteurs — Prescriptions générales pour
la conception et la construction des protecteurs fixes et mobiles
Reference number
ISO 14120:2015(E)
©
ISO 2015

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SIST EN ISO 14120:2016
ISO 14120:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2015 – All rights reserved

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SIST EN ISO 14120:2016
ISO 14120:2015(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Risk assessment . 8
5 General requirements for the design and construction of guards .8
5.1 Machine aspects . 8
5.1.1 General. 8
5.1.2 Access to hazard zones . 8
5.1.3 Containment of ejected parts and other impacts . 8
5.1.4 Containment of hazardous substances . 9
5.1.5 Noise . 9
5.1.6 Radiation . . 9
5.1.7 Potentially explosive atmosphere . 9
5.2 Human aspects . 9
5.2.1 General. 9
5.2.2 Safety distances . 9
5.2.3 Control of access to the hazard zone . 9
5.2.4 Viewing .10
5.2.5 Ergonomic aspects .10
5.2.6 Intended use .10
5.3 Guard design and construction aspects.11
5.3.1 General.11
5.3.2 Crushing or trapping points .11
5.3.3 Durability .11
5.3.4 Hygiene .11
5.3.5 Cleaning .11
5.3.6 Exclusion of contaminants .11
5.3.7 Sharp edges, etc. .11
5.3.8 Integrity of joints .11
5.3.9 Removal of fixed guards.11
5.3.10 Mounting of removable fixed guards .12
5.3.11 Adjustable guards .12
5.3.12 Movable guards .12
5.3.13 Closed position of movable guards .12
5.3.14 Interlocking guards with a start function (control guards) .12
5.4 Materials, rigidity, and impact requirements .13
5.4.1 General.13
5.4.2 Impact and ejection resistance .13
5.4.3 Rigidity .13
5.4.4 Secure fixing.13
5.4.5 Reliability of moving parts .13
5.5 Containment .13
5.6 Resistance to corrosion .13
5.7 Resistance to microorganisms .13
5.8 Non-toxicity .14
5.9 Machine viewing .14
5.10 Transparency .14
5.11 Shadows and stroboscopic effects .14
5.12 Electrostatic properties .14
5.13 Guards with electrically conductive parts .14
© ISO 2015 – All rights reserved iii

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SIST EN ISO 14120:2016
ISO 14120:2015(E)

5.14 Thermal stability .14
5.15 Fire and flammability .14
5.16 Noise and vibration reduction .15
5.17 Radiation protection .15
5.18 Climbing .15
5.19 Retained fastenings .15
5.20 Vibration resistance .15
5.21 Warning signs .15
5.22 Colour .16
5.23 Appearance .16
6 Selection of types of guards .16
6.1 General .16
6.2 Combination of different guards or of guards with other devices .16
6.3 Selection of guards according to the number and size of the hazards .17
6.4 Selection of guards according to the nature and frequency of access required .18
6.4.1 General.18
6.4.2 Moving transmission parts .18
6.4.3 Where access is not required during use .18
6.4.4 Where access is required during use .18
7 Verification of the safety requirements for guards .19
7.1 General .19
7.2 Verification and validation methods .19
7.3 Required verification and validation .19
8 Information for use .23
8.1 General .23
8.2 Guard hazards .23
8.3 Installation .23
8.4 Operation .23
8.5 Removal of guards .23
8.6 Inspection and maintenance .24
Annex A (informative) Example of retained fastening .25
Annex B (informative) Example of projectile test method for mechanically testing guards .26
Annex C (informative) Example of pendulum test method for mechanically testing guards .30
Annex D (informative) Relationship between International Standards referenced in
Clause 2 and corresponding European Standards .34
Bibliography .35
iv © ISO 2015 – All rights reserved

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SIST EN ISO 14120:2016
ISO 14120:2015(E)

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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 199, Safety of machinery.
This second edition cancels and replaces the first edition (ISO 14120:2002), which has been technically
revised. The main changes from the previous edition are as follows.
— Definitions have been brought into line with ISO 12100. The figures showing examples of guards
have been updated where appropriate.
— Clause 5 has been updated with new references to ISO 13855 and ISO 14119. Requirements on the
removal of guards have been amended. Subclause 5.3.9 describes requirements for the removal
of fixed guards only with a tool. In addition, there is a requirement that fixed guards be designed
to prevent easy removal. The subclause about impact and ejection resistance (5.4) has been
strengthened. Subclauses on Climbing (5.18), Retained fastenings (5.19), Warning signs (5.21),
Colour (5.22) and Appearance (5.23) have been added.
— Clause 6 has been amended and updated to better include cover combinations of different guards or
of guards with other devices. Selection of guards according to the number and size of the hazards
(6.3) has been changed and updated. Subclause 6.4.4.2, where access is required during the working
cycle, has been changed and updated.
— Clauses on verification and validation have been introduced (Clause 7). This includes a table which
outlines the safety requirements and/or measures by subclause.
— The text of Clause 8 has been updated, including requirements for procedures for removal of guards
(use of a tool and the safe working procedure). The subclause for removal of guards (8.5) has changed.
— Two new informative annexes on test methods, one on projectile tests and the other on impact tests,
have been added.
— The Bibliography, which contains a list of International and European Standards published or in
preparation that can be helpful in the design and commissioning of guards, has been updated.
© ISO 2015 – All rights reserved v

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SIST EN ISO 14120:2016
ISO 14120:2015(E)

Introduction
The structure of safety standards in the field of machinery is as follows:
a) type-A standards (basic safety standards) giving basic concepts, principles for design, and general
aspects that can be applied to all machinery;
b) type-B standards (generic safety standards) dealing with one safety aspect or one or more type(s)
of safeguard that can be used across a wide range of machinery:
— type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
— type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure-
sensitive devices, guards);
c) type-C standards (machine safety standards) dealing with detailed safety requirements for a
particular machine or group of machines.
This International Standard is a type-B2 standard as stated in ISO 12100.
Guards provide a risk reduction for both protection against unintended access and against ejected
parts and substances. The guarding can also give protection against others hazards, e.g. noise, fire,
biological hazards, and radiation.
The requirements of this document can be supplemented or modified by a type-C standard.
For machines that are covered by the scope of a type-C standard and that have been designed and built
according to the requirements of that standard, the requirements of that type-C standard take precedence.
vi © ISO 2015 – All rights reserved

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SIST EN ISO 14120:2016
INTERNATIONAL STANDARD ISO 14120:2015(E)
Safety of machinery — Guards — General requirements for
the design and construction of fixed and movable guards
1 Scope
This International Standard specifies general requirements for the design, construction, and selection
of guards provided to protect persons from mechanical hazards.
This International Standard indicates o
...

SLOVENSKI STANDARD
oSIST prEN ISO 14120:2013
01-november-2013
9DUQRVWVWURMHY9DURYDOD6SORãQH]DKWHYH]DQDþUWRYDQMHLQNRQVWUXLUDQMH
SULWUMHQLKLQSUHPLþQLKYDURYDO,62',6
Safety of machinery - Guards - General requirements for the design and construction of
fixed and movable guards (ISO/DIS 14120:2013)
Sicherheit von Maschinen - Trennende Schutzeinrichtungen - Allgemeine Anforderungen
an Gestaltung und Bau von feststehenden und beweglichen trennenden
Schutzeinrichtungen (ISO/DIS 14120:2013)
Sécurité des machines - Protecteurs - Prescriptions générales pour la conception et la
construction des protecteurs fixes et mobiles (ISO/DIS 14120:2013)
Ta slovenski standard je istoveten z: prEN ISO 14120
ICS:
13.110 Varnost strojev Safety of machinery
oSIST prEN ISO 14120:2013 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 14120:2013

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oSIST prEN ISO 14120:2013
DRAFT INTERNATIONAL STANDARD
ISO/DIS 14120
ISO/TC 199 Secretariat: DIN
Voting begins on: Voting terminates on:
2013-08-22 2014-01-22
Safety of machinery — Guards — General requirements for
the design and construction of fixed and movable guards
Sécurité des machines — Protecteurs — Prescriptions générales pour la conception et la construction des
protecteurs fixes et mobiles
[Revision of first edition (ISO 14120:2002)]
ICS: 13.110
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 14120:2013(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2013

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oSIST prEN ISO 14120:2013
ISO/DIS 14120:2013(E)

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as
permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract
from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,
electronic, photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to 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 + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2013 – All rights reserved

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oSIST prEN ISO 14120:2013
ISO/DIS 14120
Contents Page
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Risk assessment . 8
5 General requirements for the design and construction of guards . 8
5.1 Machine aspects . 8
5.1.1 General . 8
5.1.2 Access to hazard zones . 8
5.1.3 Containment of ejected parts . 9
5.1.4 Containment of hazardous substances . 9
5.1.5 Noise . 9
5.1.6 Radiation . 9
5.1.7 Potentially explosive atmosphere . 9
5.2 Human aspects . 9
5.2.1 General . 9
5.2.2 Safety distances . 10
5.2.3 Control of access to the hazard zone . 10
5.2.4 Viewing . 10
5.2.5 Ergonomic aspects . 10
5.2.6 Intended use . 11
5.3 Guard design and construction aspects . 11
5.3.1 General . 11
5.3.2 Crushing or trapping points . 11
5.3.3 Durability . 11
5.3.4 Hygiene . 11
5.3.5 Cleaning . 11
5.3.6 Exclusion of contaminants . 11
5.3.7 Sharp edges, etc. . 11
5.3.8 Integrity of joints . 11
5.3.9 Removal of fixed guards . 11
5.3.10 Means of mounting of fixed guards which are removable . 12
5.3.11 Adjustable guards . 12
5.3.12 Movable guards . 12
5.3.13 Closing of movable guards . 12
5.3.14 Interlocking guards with a start function (control guards) . 12
5.4 Materials, rigidity and impact requirements . 13
5.4.1 General . 13
5.4.2 Impact and ejection resistance . 13
5.4.3 Rigidity. 13
5.4.4 Secure fixing . 13
5.4.5 Reliability of moving parts . 13
5.5 Containment . 13
5.6 Resistance to corrosion. 13
5.7 Resistance to micro-organisms . 14
5.8 Non-toxicity . 14
5.9 Machine viewing . 14
5.10 Transparency . 14
© ISO 2013 – All rights reserved iii

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oSIST prEN ISO 14120:2013
ISO/DIS 14120
5.11 Shadows and stroboscopic effects .14
5.12 Electrostatic properties .14
5.13 Guards with electrically conductive parts .14
5.14 Thermal stability .15
5.15 Fire and flammability .15
5.16 Noise and vibration reduction .15
5.17 Radiation protection .15
5.18 Climbing .15
5.19 Retained fastenings .15
5.20 Vibration resistance .16
5.21 Warning signs .16
5.22 Colour .16
5.23 Appearance .16
6 Selection of types of guards .16
6.1 General .16
6.2 Combination of different guards or of guards with other devices .17
6.3 Selection of guards according to the number and location of the hazards .18
6.4 Selection of guards according to the nature and frequency of access required .19
6.4.1 General .19
6.4.2 Moving transmission parts .19
6.4.3 Where access is not required during use .19
6.4.4 Where access is required during use .19
7 Verification of the safety requirements for guards .20
7.1 General .20
7.2 Impact strength .20
7.3 Safety distances.20
7.4 Containment .20
7.5 Noise .20
7.6 Guard operating forces .20
7.7 Visibility .20
8 Information for use .21
8.1 General .21
8.2 Guard hazards .21
8.3 Installation .21
8.4 Operation .21
8.5 Removal of guards .21
8.6 Inspection and maintenance .21
Annex A (informative) Examples of retained fastenings .23
Annex B (informative) Guidelines for the selection of guards against hazards generated by
moving parts .25
Annex C (informative) Guidelines for the selection of guards according to the number and
location of hazards .26
Annex D (informative) Examples of test methods .27
D.1 General information about test methods testing construction of fixed and interlocked
movable guards .27
D.2 Resistance of guards against impacts from outside the hazard zone .27
D.3 Resistance of guards against impacts from inside the dangerous zone .27
D.4 Projectile test .28
D.4.1 General .28
D.4.2 Test equipment .28
D.4.3 Test method .30
D.4.4 Test report – conclusion .30
D.5 Pendulum test method .32
D.5.1 General .32
D.5.2 Test equipment .32
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D.5.3 Test report – conclusion . 33
D.5.4 Pendulum test method . 34
Annex E (informative) Relationship between International Standards referenced in Clause 2 and
corresponding European Standards . 36
Annex F (informative) Changed clauses compared with previous edition . 37
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 38
Bibliography . 39


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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 14120 was prepared by Technical Committee ISO/TC 199, Safety of machinery, and by CEN/TC 114,
Safety of machinery, in collaboration.
This second edition cancels and replaces the first edition (ISO 14120:2002) and ISO 14120 AMD 1:2009,
which has been technically revised.
Annexes A, B and C are for information only.
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Introduction
The structure of safety standards in the field of machinery is as follows:
a) type-A standards (basic safety standards) giving basic concepts, principles for design, and general
aspects that can be applied to all machinery;
b) type-B standards (generic safety standards) dealing with one safety aspect or one or more type(s) of
safeguard that can be used across a wide range of machinery:
− type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature,
noise);
− type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure-
sensitive devices, guards);
c) type-C standards (machine safety standards) dealing with detailed safety requirements for a
particular machine or group of machines.
This document is a type-B2 standard as stated in ISO 12100.
Guards provide a risk reduction for both protection against unintended access and against ejected parts and
substances and also e.g. against fire hazards.

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oSIST prEN ISO 14120:2013
DRAFT INTERNATIONAL STANDARD ISO/DIS 14120

Safety of machinery — Guards — General requirements for the
design, construction and selection of fixed and movable guards
1 Scope
This International Standard specifies general requirements for the design, construction and selection of
guards provided to protect persons from mechanical hazards.
This International Standard indicates other hazards that can influence the design and construction of guards.
This International Standard applies primarily to machines which will be manufactured after it is published.
The requirements are applicable if fixed and movable guards are used. This International Standard does not
cover interlocking devices. These are covered in ISO 14119.
This International Standard does not provide requirements for special systems relating specifically to mobility
or to the ability to lift loads such as rollover protective structures (ROPS) and falling-object protective
structures (FOPS).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 14119, Safety of machinery — Interlocking devices associated with guards — Principles for design and
selection
ISO 14123-1, Safety of machinery — Reduction of risks to health from hazardous substances emitted by
machinery — Part 1: Principles and specifications for machinery manufacturers
IEC 60204-1:2005, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100 and the following apply.
3.1
guard
physical barrier, designed as part of the machine, to provide protection
Note 1 to entry: A guard may act:
- alone; it is then only effective when it is "closed" for a movable guard or "securely held in place" for a fixed guard;
- in conjunction with an interlocking device with or without guard locking; in this case, protection is ensured whatever the
position of the guard.
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Note 2 to entry: Depending on its design, a guard may be called e.g. casing, shield, cover, screen, door, enclosing
guard.
[SOURCE: ISO 12100:2010, 3.27]
3.2
fixed guard
guard affixed in such a manner (for example, by screws, nuts, welding) that it can only be opened or removed
by the use of tools or by destruction of the means by which the guard is affixed
[SOURCE: ISO 12100:2010, 3.27.1]
3.2.1
enclosing guard
guard which prevents access to the hazard zone from all sides
Note to entry: See Figure 1.

Figure 1 — Example of an enclosing guard totally preventing access to transmission machinery
3.2.2
distance guard
guard which does not completely enclose a hazard zone, but which prevents or reduces access by virtue of its
dimensions and its distance from the hazard zone, for example perimeter fence or tunnel guard
Note 1 to entry: A distance guard can be partially or fully surrounding.
Note 2 to entry: See Figures 2 and 3.
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Figure 2 — Example of a distance guard

Figure 3 — Example of a distance guard: tunnel guard providing protection at machine feed or
discharge area
3.3
movable guard
guard which can be opened without the use of tools
[SOURCE: ISO 12100:2010, 3.27.2]
3.3.1
power-operated guard
movable guard that is operated with the assistance of power from a source other than persons or gravity
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3.4
adjustable guard
movable guard operated by a machine element (for example a moving table) or by the workpiece or a part of
the machining jig, so that it allows the workpiece (and the jig) to pass and then automatically returns (by
means of gravity, a spring, other external power, etc.) to the closed position as soon as the workpiece has
vacated the opening through which it has been allowed to pass
[SOURCE: ISO 12100:2010, 3.27.3]
Note 1 to entry:  Adjustable guards can be manually or automatically adjusted.
Note 2 to entry:  A self-closing guard can be an automatically adjustable guard, see Figure 4.
Note 3 to entry: For manually adjustable guards, see also Figure 5.

Figure 4 — Example of a self-closing guard

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Note 4 to entry: The guard is telescopic to provide ready adjustment to the surface of the workpiece, and it is attached
to a hinge to permit access to the spindle for drill changing.
Figure 5 — Example of an adjustable guard for a radial or pedestal drilling machine
3.5
interlocking guard
guard associated with an interlocking device so that, together with the control system of the machine, the
following functions are performed:
⎯ the hazardous machine functions “covered” by the guard cannot operate until the guard is closed,
⎯ if the guard is opened while hazardous machine functions are operating, a stop command is given, and
⎯ when the guard is closed, the hazardous machine functions “covered” by the guard can operate (the
closure of the guard does not by itself start the hazardous machine functions)
[SOURCE: SO 12100:2010, 3.27.4]
Note 1 to entry: See Figure 6 and Figure 7
...