EN ISO 14122-3:2016

Safety of machinery - Permanent means of access to machinery - Part 3: Stairs, stepladders and guard-rails (ISO 14122-3:2016)

ISO 14122-3:2016 gives requirements for non-powered stairs, stepladders and guard-rails which are a part of a stationary machine, and to the non-powered adjustable parts (e.g. foldable, slidable) and movable parts of those fixed means of access.
NOTE 1       "Fixed" means of access are those mounted in such a manner (for example, by screws, nuts, welding) that they can only be removed by the use of tools.
ISO 14122-3:2016 specifies minimum requirements that also apply when the same means of access is required as the part of the building or civil construction (e.g. stairs, stepladders, guard-rails) where the machine is installed, on condition that the main function of that part of the construction is to provide a means of access to the machine.
NOTE 2       Where no local regulation or standards exists, this part of ISO 14122 may be used also for means of access which are outside the scope of the standard.
It is intended that this part of ISO 14122 be used with ISO 14122‑1 to give the requirements for steps, stepladders and guard-rails.
The ISO 14122 series as a whole is applicable to both stationary and mobile machinery where fixed means of access are necessary. It is not applicable to powered means of access such as lifts, escalators, or other devices specially designed to lift persons between two levels.
ISO 14122-3:2016 is not applicable to machinery manufactured before the date of its publication.

Sicherheit von Maschinen - Ortsfeste Zugänge zu maschinellen Anlagen - Teil 3: Treppen, Treppenleitern und Geländer (ISO 14122-3:2016)

Sécurité des machines - Moyens d'accès permanents aux machines - Partie 3: Escaliers, échelles à marches et garde-corps (ISO 14122-3:2016)

ISO 14122-3:2016 donne les exigences pour les escaliers, échelles à marches et garde-corps non-motorisés qui font partie intégrante d'une machine fixe et aux parties réglables non-motorisées (par exemple pliables, coulissantes) ainsi qu'aux parties mobiles de ces moyens d'accès fixes.
NOTE 1       Les moyens d'accès «fixes» sont ceux montés de telle manière (par exemple par boulonnage, par soudage) qu'ils ne puissent être ouverts ou démontés qu'à l'aide d'outils.
ISO 14122-3:2016 spécifie les exigences minimales s'appliquant également aux moyens d'accès aux parties du bâtiment ou de la construction civile (par exemple escaliers, échelles à marches et garde-corps) où la machine est installée, à condition que la fonction principale de cette partie de la construction soit de donner accès à la machine.
NOTE 2       Lorsqu'aucune norme nationale ou réglementation n'existe, la présente partie de l'ISO 14122 peut être utilisée pour les moyens d'accès en dehors de son domaine d'application.
ISO 14122-3:2016 a pour but d'être utilisée avec l'ISO 14122‑1 afin de donner les exigences pour les escaliers, échelles à marches et garde-corps.
L'ensemble de la série ISO 14122 est applicable aux machines fixes et mobiles pour lesquelles des moyens d'accès fixes sont nécessaires. Cette série n'est pas applicable aux moyens d'accès motorisés tels que les ascenseurs, les escalators, ou d'autres dispositifs conçus spécialement pour soulever des personnes entre deux niveaux.
ISO 14122-3:2016 n'est pas applicable aux machines fabriquées avant sa date de publication.

Varnost strojev - Stalni dostopi do strojev - 3. del: Stopnice, stopničaste lestve in varovalne ograje (ISO 14122-3:2016)

Ta del standarda ISO 14122 določa zahteve za stopnice, stopničaste lestve in varovalne ograje brez pogona, ki so del stacionarnega stroja, in za prilagodljive dele brez pogona (npr. zložljive, drsne) ter premične dele teh fiksnih načinov dostopa.
OPOMBA 1: »Fiksni« načini dostopa so tisti, ki so nameščeni na tak način (na primer z vijaki, maticami, privarjeni), da jih je mogoče odstraniti samo z orodjem.
Ta del standarda ISO 14122 določa minimalne zahteve, ki veljajo tudi, kadar je enak način dostopa zahtevan kot del objekta ali nizke gradnje (npr. stopnice, stopničaste lestve in varovalne ograje), če je stroj vgrajen, pod pogojem, da je glavna funkcija tega dela konstrukcije zagotoviti način dostopa do stroja.
OPOMBA 2: Če ni lokalnih predpisov ali standardov, se lahko ta del standarda ISO 14122 uporabi tudi za načine dostopa, ki so zunaj področja uporabe tega standarda.
Ta del standarda ISO 14122 je namenjen za uporabo s standardom ISO 14122-1 za določanje zahtev za stopnice, stopničaste lestve in varovalne ograje.
Skupina standardov ISO 14122 se kot celota uporablja za stacionarne in mobilne stroje, kjer je potreben
fiksni način dostopa. Ne uporablja se za načine dostopa s pogonom, kot so dvigala, tekoče stopnice ali druge naprave, posebej zasnovane za dviganje oseb med dvema ravnema.
Ta del standarda ISO 14122 se ne uporablja za stroje, izdelane pred datumom njegove objave.

General Information

• Status: Published
• Publication Date: 21-Jun-2016
• Withdrawal Date: 30-Dec-2016
• ICS: 13.110 - Safety of machinery
• Technical Committee: CEN/TC 114 - Safety of machinery
• Drafting Committee: CEN/TC 114 - Safety of machinery
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Jun-2016
• Completion Date: 22-Jun-2016
• 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/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/BC/CEN/88/13 - Standardization request to CEN/CENELEC relating to machinery
• Ref Project: SIST EN ISO 14122-3:2016 - Safety of machinery - Permanent means of access to machinery - Part 3: Stairs, stepladders and guard-rails (ISO 14122-3:2016)

Relations

• Replaces: EN ISO 14122-3:2001 - Safety of machinery - Permanent means of access to machinery - Part 3: Stairs, stepladders and guard-rails (ISO 14122-3:2001)
• Effective Date: 29-Jun-2016
• Replaces: EN ISO 14122-3:2001/A1:2010 - Safety of machinery - Permanent means of access to machinery - Part 3: Stairs, stepladders and guard-rails - Amendment 1 (ISO 14122-3:2001/Amd 1:2010)
• Effective Date: 02-May-2012

Overview

EN ISO 14122-3:2016 (ISO 14122-3:2016) - "Safety of machinery - Permanent means of access to machinery - Part 3: Stairs, stepladders and guard-rails" provides minimum safety requirements for non-powered, fixed means of access that are part of machinery. It covers stairs, stepladders and guard-rails (including non-powered adjustable and movable parts such as foldable or slidable elements) used to reach machine operating and service points. This part is intended to be used together with ISO 14122‑1 and is part of the ISO 14122 series on permanent means of access.

Key topics and technical requirements

• Scope and applicability
  • Applies to non-powered, fixed access attached to stationary (and where applicable, mobile) machinery.
  • Can apply to building/civil construction elements only if their main function is providing access to the machine.
  • Not applicable to powered access (lifts, escalators) or to machinery manufactured before publication.
• General construction and materials
  • Requirements for robust construction, durable materials and secure mounting (e.g., fixed by screws, nuts, welding).
• Design requirements
  • Structural design of steps, stair runs and stepladders to ensure safe use and ergonomic compatibility (dimensions align with referenced ergonomic data such as ISO 15534‑3).
  • Requirements for handrails, guard-rails and gates to prevent falls and entrapment.
• Specific provisions
  • Sections addressing stairs, stepladders, and guard-rails separately, including handrail geometry, clearance, and integration with platforms and landings.
• Verification and testing
  • Methods for testing guard-rails, stair steps and stepladders to verify strength and performance under expected loads.
• Regulatory linkage
  • Supports presumption of conformity with relevant essential requirements of the EU Machinery Directive (2006/42/EC) when used with ISO 14122‑1.

Practical applications

• Used by machine builders to design and supply compliant permanent access (stairs, stepladders, guard-rails) integrated with machinery.
• Guidance for safety engineers, maintenance teams and plant managers to assess and retrofit access for safe operation and service.
• Reference for consultants, conformity assessors and market surveillance authorities to evaluate compliance with machinery safety requirements.

Who uses this standard

• Machine manufacturers and OEMs
• Occupational health & safety bodies and regulators
• Employers, maintenance/service providers and safety professionals
• Standardization bodies and type‑C standard developers

Related standards

• ISO 14122‑1 (Choice of fixed means and general requirements)
• Other parts of ISO 14122 (Part 2: platforms/walkways; Part 4: fixed ladders)
• Ergonomics reference: ISO 15534‑3

Keywords: EN ISO 14122-3:2016, ISO 14122-3, safety of machinery, permanent means of access, stairs, stepladders, guard-rails, guardrails testing, machine access, machinery directive.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2016
1DGRPHãþD
SIST EN ISO 14122-3:2002
SIST EN ISO 14122-3:2002/A1:2010
9DUQRVWVWURMHY6WDOQLGRVWRSLGRVWURMHYGHO6WRSQLFHVWRSQLþDVWHOHVWYHLQ
YDURYDOQHRJUDMH,62
Safety of machinery - Permanent means of access to machinery - Part 3: Stairs,
stepladders and guard-rails (ISO 14122-3:2016)
Sicherheit von Maschinen - Ortsfeste Zugänge zu maschinellen Anlagen - Teil 3:
Treppen, Treppenleitern und Geländer (ISO 14122-3:2016)
Sécurité des machines - Moyens d'accès permanents aux machines - Partie 3: Escaliers,
échelles à marches et garde-corps (ISO 14122-3:2016)
Ta slovenski standard je istoveten z: EN ISO 14122-3:2016
ICS:
13.100 Varnost pri delu. Industrijska Occupational safety.
higiena Industrial hygiene
13.110 Varnost strojev Safety of machinery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 14122-3
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 13.110 Supersedes EN ISO 14122-3:2001
English Version
Safety of machinery - Permanent means of access to
machinery - Part 3: Stairs, stepladders and guard-rails (ISO
14122-3:2016)
Sécurité des machines - Moyens d'accès permanents Sicherheit von Maschinen - Ortsfeste Zugänge zu
aux machines - Partie 3: Escaliers, échelles à marches maschinellen Anlagen - Teil 3: Treppen, Treppenleitern
et garde-corps (ISO 14122-3:2016) und Geländer (ISO 14122-3:2016)
This European Standard was approved by CEN on 29 April 2016.

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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14122-3:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC machinery, and amending
Directive 95/16/EC (recast) [2006 L157] aimed to be covered. 4

European foreword
This document (EN ISO 14122-3:2016) 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 December 2016, and conflicting national standards
shall be withdrawn at the latest by December 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 ISO 14122-3:2001.
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 14122-3:2016 has been approved by CEN as EN ISO 14122-3:2016 without any
modification.
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC machinery, and amending
Directive 95/16/EC (recast) [2006 L157] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/396 to
provide one voluntary means of conforming to essential requirements of 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) [2006 L157].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 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.
Table ZA.1 — Correspondence between this European Standard and
Directive 2006/42/EC [2006 L157]
Essential Requirements of Clause(s) / subclause(s)
Remarks / Notes
Directive 2006/42/EC of this EN
1.5.15 “Risks of slipping, tripping All
or falling”
1.6.2 “Access to operating All
position and service points”
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
IMPORTANT: Compliance with the requirements of EN ISO 14122-1 and a relevant access-specific
part of EN ISO 14122 is necessary to achieve presumption of conformity.
INTERNATIONAL ISO
STANDARD 14122-3
Second edition
2016-06-01
Safety of machinery — Permanent
means of access to machinery —
Part 3:
Stairs, stepladders and guard-rails
Sécurité des machines — Moyens d’accès permanents aux
machines —
Partie 3: Escaliers, échelles à marches et garde-corps
Reference number
ISO 14122-3:2016(E)
©
ISO 2016
ISO 14122-3:2016(E)
© ISO 2016, 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 2016 – All rights reserved

ISO 14122-3:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 6
4.1 Construction and materials . 6
4.2 Design and construction for the structure and the steps . 6
5 Specific requirements applicable to stairs . 6
6 Specific requirements applicable to step ladders . 7
7 Specific requirements applicable to guard-rails . 9
7.1 Guard-rails for platforms, walkways and stair landings . 9
7.2 Guard-rails and handrails for stairs and handrails for step ladders .11
7.3 Additional fall-protection when steps, stairs or ladders are near guard-rails of
working platforms .13
7.4 Gates .13
8 Verification of safety requirements .14
8.1 General .14
8.2 Testing of guard-rails .14
8.2.2 Testing procedure .16
8.3 Testing of steps of a stair .17
8.4 Testing of stepladders .19
Annex A (informative) Significant technical changes between this part of ISO 14122 and the
previous edition .20
Bibliography .22
ISO 14122-3:2016(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 14122-3:2001) which has been technically
revised. It also incorporates the Amendment ISO 14122-3:2001/Amd 1:2010.
ISO 14122 consists of the following parts, under the general title Safety of machinery — Permanent
means of access to machinery:
— Part 1: Choice of fixed means and general requirements of access
— Part 2: Working platforms and walkways
— Part 3: Stairs, stepladders and guard-rails
— Part 4: Fixed ladders
An additional part, dealing with mobile machinery, is under preparation.
iv © ISO 2016 – All rights reserved

ISO 14122-3:2016(E)
Introduction
This International Standard is a type-B standard as stated in ISO 12100. It is relevant, in particular, for
the following stakeholder groups representing the market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).
Others can be affected by the level of machinery safety achieved with the means of this International
Standard by the above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for peoples with special needs);
— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this International Standard.
In addition, this International Standard is intended for standardization bodies elaborating type-C
standards. The requirements of this International Standard can be supplemented or modified by a
type-C standard.
For machines which are covered by the scope of a type-C standard and which have been designed and
built according to the requirements of that standard, the requirements of that type-C standard take
precedence.
The purpose of this International Standard is to define the general requirements for safe access to
machines. ISO 14122-1 gives guidance about the correct choice of access means when the necessary
access to the machine is not possible directly from the ground level or from a floor or platform.
The dimensions specified are consistent with established ergonomic data given in ISO 15534-3.
INTERNATIONAL STANDARD ISO 14122-3:2016(E)
Safety of machinery — Permanent means of access to
machinery —
Part 3:
Stairs, stepladders and guard-rails
1 Scope
This part of ISO 14122 gives requirements for non-powered stairs, stepladders and guard-rails which
are a part of a stationary machine, and to the non-powered adjustable parts (e.g. foldable, slidable) and
movable parts of those fixed means of access.
NOTE 1 “Fixed” means of access are those mounted in such a manner (for example, by screws, nuts, welding)
that they can only be removed by the use of tools.
This part of ISO 14122 specifies minimum requirements that also apply when the same means of access
is required as the part of the building or civil construction (e.g. stairs, stepladders, guard-rails) where
the machine is installed, on condition that the main function of that part of the construction is to
provide a means of access to the machine.
NOTE 2 Where no local regulation or standards exists, this part of ISO 14122 may be used also for means of
access which are outside the scope of the standard.
It is intended that this part of ISO 14122 be used with ISO 14122-1 to give the requirements for steps,
stepladders and guard-rails.
The ISO 14122 series as a whole is applicable to both stationary and mobile machinery where fixed
means of access are necessary. It is not applicable to powered means of access such as lifts, escalators,
or other devices specially designed to lift persons between two levels.
This part of ISO 14122 is not applicable to machinery manufactured before the date of its publication.
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, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 14122-1:2016, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of
fixed means and general requirements of access
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100, ISO 14122-1 and the
following apply.
ISO 14122-3:2016(E)
3.1
stairs
step ladders
succession of horizontal levels — steps (3.1.11) and landings (3.1.5) — allowing passage on foot from
one level to another
Note 1 to entry: Stairs/step ladders are composed of the elements shown in Figure 1 and defined in 3.1.1 to 3.1.16.
Note 2 to entry: For details on the angle of pitch (3.1.9) for stairs/step ladders, see ISO 14122-1:2016, 3.2 and 3.3.
Key
H climbing height α angle of pitch
g going w width
e head-height p pitch line
h rise t depth of step
r overlap c clearance
Figure 1 — Parts of stairs
3.1.1
climbing height
vertical distance between the reference level and the landing (3.1.5)
Note 1 to entry: See H in Figure 1.
3.1.2
flight
uninterrupted sequence of steps (3.1.11) between two landings (3.1.5)
2 © ISO 2016 – All rights reserved

ISO 14122-3:2016(E)
3.1.3
going
horizontal distance between the step nosing (3.1.12) of two consecutive steps
Note 1 to entry: See g in Figure 1.
3.1.4
head-height
minimum vertical distance, clear of all obstacles (such as beams, ducts, etc.) above the pitch line (3.1.8)
Note 1 to entry: See e in Figure 1.
3.1.5
landing
horizontal resting area situated at the end of a flight (3.1.2)
3.1.6
walking line
theoretical line indicating the average path of the users
3.1.7
overlap
difference between the depth of the step and the going (3.1.3)
Note 1 to entry: See r in Figure 1.
3.1.8
pitch line
notional line connecting the leading edge of the nosing (3.1.12) of successive steps (3.1.11) taken on the
walking line (3.1.6) and which extends down to the landing at the bottom of the flight (3.1.2) from the
nosing on the landing at the top of the flight
Note 1 to entry: See p in Figure 1.
3.1.9
angle of pitch
angle between the pitch line (3.1.8) and its projection on the horizontal level
Note 1 to entry: See α in Figure 1.
3.1.10
rise
height between two consecutive steps (3.1.11) measured from the tread surface of one to the tread
surface of the next
Note 1 to entry: See h in Figure 1.
3.1.11
step
horizontal surface on which one places the foot to go up or down the stair/step ladder (3.1)
3.1.12
nosing
top edge at the front of the step (3.1.11) or landing (3.1.5)
3.1.13
string
flanking framework element supporting the steps (3.1.11)
ISO 14122-3:2016(E)
3.1.14
width
clear distance over the outside faces of the step (3.1.11)
Note 1 to entry: See w in Figure 1.
3.1.15
depth of step
clear distance from the leading edge or the nosing (3.1.12) to the rear of the step (3.1.11)
Note 1 to entry: See t in Figure 1.
3.1.16
clearance
absolute minimum clear distance between any obstacle and the pitch line (3.1.8), measured at an angle
of 90° from the pitch line
Note 1 to entry: See c in Figure 1.
3.2
guard-rail
device for protection against accidental fall sideways with which stairs/step ladders (3.1) or landings
(3.1.5), platforms and walkways may be equipped
Note 1 to entry: Typical parts of a guard-rail are shown in Figure 2 and defined in 3.2.1 to 3.2.5.
a)  Guard-rail with knee rail b) Guard-rail with vertical uprights
Key
1 handrail 4 stanchion
2 knee rail 5 walking level
3 toe-plate 6 vertical uprights
Figure 2 — Examples of the parts of a typical structure of a guard-rail
3.2.1
handrail
rigid top element designed to be grasped by the hand for body support which can be used individually
or as the upper part of a guard-rail (3.2)
Note 1 to entry: See 1 in Figure 2.
4 © ISO 2016 – All rights reserved

ISO 14122-3:2016(E)
3.2.2
knee rail
rigid element of the guard-rail (3.2) placed parallel with the handrail (3.2.1), giving extra protection
against the passage of a body
Note 1 to entry: See 2 in Figure 2.
3.2.3
stanchion
vertical structural element of the guard-rail (3.2) to anchor the guard-rail to the platform or stair (3.1)
Note 1 to entry: See 4 in Figure 2.
3.2.4
toe-plate
rigid lower part of a guard-rail (3.2) to prevent the falling of objects from floor level
Note 1 to entry: See 3 in Figure 2.
Note 2 to entry: A toe-plate also reduces the free space between the floor and knee rail (3.2.2) to prevent the
passage of a body.
3.2.5
self-closing gate
pivoting part of the guard-rail (3.2) which enables access through the guard-rail
Note 1 to entry: See Figure 10.
Note 2 to entry: The rest position is closed.
3.2.6
mezzanine gate
gate designed for loading and unloading goods to and from mezzanine floor providing a permanent
collective fall protection
Note 1 to entry: See Figure 3.
a)  Pivot gate b) Vertical gate
Figure 3 — Examples of principle function of mezzanine gates
ISO 14122-3:2016(E)
3.2.7
transfer zone
area defined by the loading zone and the space needed for the movement of the mezzanine gate (3.2.6)
4 General requirements
4.1 Construction and materials
Stairs, step ladders and guard-rails — including fittings, hinges, anchorage points, supports and
mountings — shall be designed and constructed and the materials selected so that they withstand
the foreseeable conditions of use (see ISO 14122-1:2016, Clause 5). In particular, at least the following
details shall be taken into account:
a) dimensions of stairs, stepladders and guard-rails shall be in accordance with available
anthropomorphic data (see also ISO 15534-1 and ISO 15534-3);
b) guard-rails shall be designed and constructed to prevent objects falling;
b) for hazards generated by falling objects through openings on steps, see ISO 14122-2:2016, 4.2.4.5.1.
Opening or closing of moving parts (gates), of
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