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
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
22-Jun-2016
Completion Date
22-Jun-2016

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SLOVENSKI STANDARD
SIST EN ISO 14122-3:2016
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
SIST EN ISO 14122-3:2016 en,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 14122-3:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 14122-3:2016
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.
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SIST EN ISO 14122-3:2016
EN ISO 14122-3:2016 (E)
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

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SIST EN ISO 14122-3:2016
EN ISO 14122-3:2016 (E)
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.
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SIST EN ISO 14122-3:2016
EN ISO 14122-3:2016 (E)
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.
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SIST EN ISO 14122-3:2016
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
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SIST EN ISO 14122-3:2016
ISO 14122-3:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© 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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 14122-3:2016
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 2016 – All rights reserved iii
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SIST EN ISO 14122-3:2016
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
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SIST EN ISO 14122-3:2016
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.

© ISO 2016 – All rights reserved v
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SIST EN ISO 14122-3:2016
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SIST EN ISO 14122-3:2016
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 2016 – All rights reserved 1
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SIST EN ISO 14122-3:2016
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
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SIST EN ISO 14122-3:2016
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 2016 – All rights reserved 3
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SIST EN ISO 14122-3:2016
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
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SIST EN ISO 14122-3:2016
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 2016 – All rights reserved 5
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SIST EN ISO 14122-3:2016
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 adjustable parts (e.g. foldable, slidable) and of movable

parts shall not cause further hazards (for example by shearing or by falling) to users and other persons

in the vicinity.
4.2 Design and construction for the structure and the steps

4.2.1 The structure and the steps shall be designed to satisfactorily resist the foreseeable imposed loads.

The unfactored loads applicable used for the structure of the stair or stepladder in the industrial

field can vary. For each application the expected unfactored loads shall be defined. As a minimum the

following assumptions for unfactored loads shall be applied in calculations to be considered, but higher

values can be necessary. Higher values shall be applied when higher loading is foreseeable:

— for low density pedestrian traffic without load, 1,5 kN/m ;

— for low density pedestrian traffic with load or for high density pedestrian traffic, 5 kN/m ;

4.2.2 Steps shall resist the following minimum unfactored loadings:

— if the clear width w < 1 200 mm then 1,5 kN shall be distributed over an area of 100 mm × 100 mm,

where one boundary is the leading edge of the nosing applied at the middle of the stair width;

— if the clear width w ≥ 1 200 mm then respectively two loads of each 1,5 kN shall be distributed

simultaneously over each of the 100 mm × 100 mm, areas applied at the most unfavourable points

spaced at intervals of 600 mm where one boundary is the leading edge of the nosing.

The deflection between the structure supporting the steps and the steps under an unfactored load shall

not exceed 1/300 of the span of the step or 6 mm, whichever is the lower.
5 Specific requirements applicable to stairs
5.1 Going, g, and rise, h, shall meet Formula (1):
600 ≤ g + 2h ≤ 660 (dimensions in millimetres) (1)

5.2 The going (distance t minus r, see Figure 4) shall be between 210 mm and 310 mm.

6 © ISO 2016 – All rights reserved
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SIST EN ISO 14122-3:2016
ISO 14122-3:2016(E)

5.3 The overlap, r, of the step shall be ≥10 mm and shall apply equally to landings and floors.

5.4 On the same flight, h shall be constant. Where it is not possible, the rise of the first step in the flight,

h , may be reduced by maximum of 15 %.
5.5 The uppermost step shall be level with the landing (see Figure 4).
Figure 4 — Positioning of the uppermost step
5.6 Head-height, e, shall be 2 300 mm minimum (see Figure 1).
5.7 Clearance, c, shall be 1 900 mm minimum (see Figure 1).

5.8 The clear width, w, of a stair shall be a minimum of 800 mm. When the stairway is usually subject

to the passage or crossing of several persons simultaneously, the clear width shall be increased to

1 000 mm. The clear width of the stair, when designated as an escape way, shall meet the requirements of

appropriate regulation.

For single flights with heights less than 1 500 mm, the clear width, w, may be reduced from 600 mm

to 500 mm.

Due to the design of the machine, the environment or occasional use, e.g. less than 30 days/year and

less than two hours/day, the clear width, w, may be reduced from 800 mm to 600 mm. If the available

space at the floor level is restricted due to pipework, electric, or constructive reason of machinery, the

stair width at floor level may be reduced to 500 mm minimum, and for a maximum height of 200 mm

(see ISO 14122-2:2016, Figure 1).
Any obstruction such as p
...

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