SIST EN ISO 14122-4:2005
(Main)Safety of machinery - Permanent means of access to machinery - Part 4: Fixed ladders (ISO 14122-4:2004)
Safety of machinery - Permanent means of access to machinery - Part 4: Fixed ladders (ISO 14122-4:2004)
This document applies to all machinery (stationary and mobile) where fixed means of access are necessary.
The purpose of this document is to define the general requirements for safe access to machines mentioned in EN ISO 12100-2. EN ISO 14122-1 gives advice 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.
This document applies to fixed ladders, which are a part of a machine.
This document may also be applied to fixed ladders to that part of the building where the machine is installed, providing the main function of that part of the building is to provide a means of access to the machine.
NOTE This document may be used also for means of access which are outside the scope of this document. In those cases the possible relevant national or other regulations should be taken into account.
This document applies also to ladders which are not permanently fixed to the machine and which may be removed, moved to the side or pivoted (swivel-mounted) for some operations of the machine (e. g. changing tools in a large press).
For the significant hazards covered by this document, see Clause 4 of EN ISO 14122-1.
This document is not applicable to machinery which are manufactured before the date of publication of this document by CEN.
Sicherheit von Maschinen - Ortsfeste Zugänge zu maschinellen Anlagen - Teil 4: Ortsfeste Steigleitern (ISO 14122-4:2004)
Diese Norm gilt für alle Maschinen (stationäre und mobile), für die ortsfeste Zugänge erforderlich sind.
Das Ziel dieser Norm ist, die generellen Anforderungen für sicheren Zugang zu Maschinen, beschrieben in EN ISO 12100-2, zu definieren. EN ISO 14122-1 gibt Hinweise zur richtigen Wahl der Zugänge, wenn der nötige Zutritt zu der Maschine nicht direkt vom Boden oder von einer Ebene möglich ist.
Diese Norm gilt für ortsfeste Steigleitern, die Teil einer Maschine sind.
Diese Norm kann auch für ortsfeste Steigleitern angewendet werden, die Teil des Gebäudes sind, in dem die Maschine aufgestellt ist, wobei die Hauptfunktion dieses Gebäudeteils darin besteht, den Zugang zu der Maschine zu ermöglichen.
ANMERKUNG Diese Norm darf auch für Zugänge angewendet werden, die außerhalb des Anwendungsbereiches dieser Norm sind. In solchen Fällen sollten relevante nationale oder andere Vorschriften beachtet werden.
Diese Norm gilt ferner für Steigleitern, die nicht ständig an der Maschine angebracht sind, sondern bei einigen Betriebsvorgängen entfernt oder zur Seite bewegt werden können (z. B. Auswechseln von Werkzeugen in einer großen Presse).
Signifikante Gefährdungen, die in dieser Norm berücksichtigt werden, siehe Abschnitt 4 von EN ISO 14122-1.
Diese Norm gilt nicht für maschinelle Anlagen, die hergestellt wurden, bevor CEN diese Norm veröffentlichte.
Sécurité des machines - Moyens d'acces permanents aux machines - Partie 4: Echelles fixes (ISO 14122-4:2004)
La présente norme s'applique a toutes les machines (fixes ou mobiles) ou des moyens d'acces fixes sont nécessaires.
L'objet du présente norme est de définir les prescriptions générales de sécurité d'acces aux machines mentionnées dans l'EN ISO 12100-2. L'EN ISO 14122-1 donne des recommandations concernant le choix approprié des moyens d'acces lorsque l'acces nécessaire a la machine n'est pas directement possible a partir du niveau du sol ou d'un plancher.
La présente norme s'applique aux échelles fixes qui font partie intégrante d'une machine.
La présente norme peut également s'appliquer aux échelles fixes donnant acces aux parties du bâtiment ou la machine est installée, a condition que la fonction principale de cette partie du bâtiment soit de donner acces a la machine.
NOTE La présente norme peut etre également utilisée pour les moyens d'acces qui sont hors du domaine d'application du présent document. Dans ce cas, il convient de tenir compte des éventuelles réglementations nationales ou autres.
La présente norme s'applique également aux échelles qui ne sont pas fixées de façon permanente sur la machine et qui peuvent etre démontées, déplacées sur le côté ou pivotées (montées sur pivot) pour certaines opérations sur la machine (par exemple changement d'outils d'une grande presse).
Pour les phénomenes dangereux significatifs couverts par la présente norme, voir Article 4 de l'EN ISO 14122-1.
La présente norme n'est pas applicable aux machines qui ont été fabriquées avant la date de publication du présente norme par le CEN.
Varnost strojev - Trajna sredstva za dostop do strojev - 4. del: Fiksne lestve (ISO 14122-4:2004)
Ta standard velja za stroje (stacionarne in mobilne), kadar so potrebni fiksni načini dostopa. Namen tega standarda je določiti splošne zahteve za varen dostop do stroja, ki je opisan v EN ISO 12100-2. EN ISO 14122-1 podaja nasvet glede prave izbire načinov dostopa, kadar ni možen potreben dostop do stroja neposredno iz tal ali nadstropja. Ta standard velja za fiksne lestve, ki so del stroja. Ta standard prav tako lahko velja za fiksne lestve do tega dela zgradbe, kjer je stroj postavljen, če je glavna funkcija tega dela zgradbe zagotoviti način dostopa da stroja. OPOMBA: Ta standard ja prav tako lahko uporabljen za načine dostopa, ki so zunaj obsega tega standarda. V teh primerih je potrebno upoštevati pomembne državne ali druge predpise. Ta standard prav tako velja za lestve, ki niso stalno fiksirane na stroj in so lahko odstranjene, premaknjene na stran ali na tečajih (nameščene z zglobom) za nekatera delovanja stroja (npr. menjava orodij v veliki stiskalnici). Za velike nevarnosti, ki so zajete v tem standardu, glej člen 4 EN ISO 14122-1. Ta standard ne velja za stroje, ki so proizvedeni pred datumom, ko je CEN objavil ta standard.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 14122-4:2005
01-marec-2005
Varnost strojev - Trajna sredstva za dostop do strojev - 4. del: Fiksne lestve (ISO
14122-4:2004)
Safety of machinery - Permanent means of access to machinery - Part 4: Fixed ladders
(ISO 14122-4:2004)
Sicherheit von Maschinen - Ortsfeste Zugänge zu maschinellen Anlagen - Teil 4:
Ortsfeste Steigleitern (ISO 14122-4:2004)
Sécurité des machines - Moyens d'acces permanents aux machines - Partie 4: Echelles
fixes (ISO 14122-4:2004)
Ta slovenski standard je istoveten z: EN ISO 14122-4:2004
ICS:
13.110 Varnost strojev Safety of machinery
97.145 Lestve Ladders
SIST EN ISO 14122-4:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 14122-4:2005
---------------------- Page: 2 ----------------------
SIST EN ISO 14122-4:2005
EUROPEAN STANDARD
EN ISO 14122-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 13.110
English version
Safety of machinery - Permanent means of access to machinery
- Part 4: Fixed ladders (ISO 14122-4:2004)
Sécurité des machines - Moyens d'accès permanents aux Sicherheit von Maschinen - Ortsfeste Zugänge zu
machines - Partie 4: Echelles fixes (ISO 14122-4:2004) maschinellen Anlagen - Teil 4: Ortsfeste Steigleitern (ISO
14122-4:2004)
This European Standard was approved by CEN on 18 March 2003.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14122-4:2004: E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Contents
Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Safety requirements .10
4.1 General requirements.10
4.2 Strength of fixed ladders .10
4.2.1 General requirements.10
4.2.2 Fixing elements.11
4.2.3 Platforms .12
4.3 Conditions for installation of an fall protection device .15
4.3.1 Conditions requiring the installation of an fall protection device .15
4.3.2 Choice of the type of fall protection device .16
4.4 Ladder .16
4.4.1 Position of the rungs.16
4.4.2 Rungs.17
4.4.3 Devices against slipping-off.19
4.4.4 Spacing between the ladder and any permanent obstruction .19
4.5 Safety cage.19
4.6 Guided type fall arrester on a rigid anchorage line.19
4.7 Departure and arrival areas - Platforms .19
4.7.1 Departure areas.20
4.7.2 Arrival areas .21
4.7.3 Access openings .22
4.7.4 Climbing off and getting on to a fixed ladder safely.22
4.7.5 Platforms .24
5 Verification of safety requirements.25
5.1 General.25
5.2 Tests of fixed ladders with two stiles .26
5.3 Testing of the safety cage.26
5.4 Tests of fixed ladders with one stile.28
5.4.1 Strength and bending of a ladder element; Torsion of the rungs .28
5.4.2 Strength of the rungs .29
5.4.3 Strength of the stile .30
5.5 Test of the anchor points.30
5.5.1 Fixed ladders with two stiles without fall arrester .30
5.5.2 Fixed ladders with one stile.31
5.5.3 Fixed ladders with fall arrester.31
6 Assembly and operating instructions .32
6.1 Assembly instructions .32
6.2 Operating instructions for ladders with fall arrester.32
6.3 Marking at points of entry and exit .32
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive Machinery 98/37/EC .33
Bibliography .34
2
---------------------- Page: 4 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Foreword
This document (EN ISO 14122-4:2004) has been prepared by Technical Committee CEN/TC 114 “Safety of
machinery”, the secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 199 “Safety
of machinery”.
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 June 2005, and conflicting national standards shall be withdrawn at the latest by
June 2005.
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, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Slovenia, Spain, Poland, Sweden, Switzerland and the United Kingdom.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Introduction
This is the fourth part of the standard "Safety of machinery — Permanent means of access to machinery". The
parts of the standard are:
Part 1: Choice of a fixed means of access between two levels
Part 2: Working platforms and walkways
Part 3: Stairs, stepladders and guard-rails
Part 4: Fixed ladders.
This European standard is a type B standard as stated in EN ISO 12100.
This standard is to be read in conjunction with Clause 1.6.2 "Access to operating position and servicing points"
and 1.5.15 "Risk of slipping, tripping or falling" of the essential safety requirements expressed in Annex A of
EN 292-2:1991/A1:1995. See also 5.5.6 "Measures for safe access to machinery" of EN ISO 12100-2:2003 which
supersedes EN 292-2.
The provisions of this document can be supplemented or modified by a type C standard.
NOTE 1 For machines which are covered by the scope of a type C standard and which have been designed and built
according to the provisions of that standard, the provisions of that type C standard will take precedence over the provisions of
this type B standard.
NOTE 2 The use of materials other than metals (composite materials, so-called "advanced" materials, etc.) does not alter the
application of the present standard.
4
---------------------- Page: 6 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
1 Scope
This standard applies to all machinery (stationary and mobile) where fixed means of access are necessary.
The purpose of this standard is to define the general requirements for safe access to machines mentioned in
EN ISO 12100-2. EN ISO 14122-1 gives advice 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.
This standard applies to fixed ladders, which are a part of a machine.
This standard may also be applied to fixed ladders to that part of the building where the machine is installed,
providing the main function of that part of the building is to provide a means of access to the machine.
NOTE This standard may be used also for means of access which are outside the scope of this standard. In those cases
the possible relevant national or other regulations should be taken into account.
This standard applies also to ladders which are not permanently fixed to the machine and which may be removed,
moved to the side or pivoted (swivel-mounted) for some operations of the machine (e. g. changing tools in a large
press).
For the significant hazards covered by this standard, see Clause 4 of EN ISO 14122-1.
This standard is not applicable to machinery which are manufactured before the date of publication of this standard
by CEN.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
EN 131-2:1993, Ladders — Requirements, tests, markings.
EN 353-1, Personal protective equipment against falls from a height — Part 1: Guided type fall arresters including a
rigid anchorage line.
EN 363, Personal protective equipment against falls from a height — Fall arrest systems.
EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical
principles (ISO 12100-2:2003).
EN ISO 14122-1, Safety of machinery — Permanents means of access to machinery — Part 1: Choice of a fixed
means of access between two levels (ISO 14122-1:2001).
EN ISO 14122-2, Safety of machinery — Permanents means of access to machinery — Part 2: Working platforms
and walkways (ISO 14122-2:2001).
EN ISO 14122-3, Safety of machinery — Permanents means of access to machinery — Part 3: Stairs, stepladders
and guard-rails (ISO 14122-3:2001).
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 12100-1:2003,
EN ISO 14122-1:2001 and the following apply.
5
---------------------- Page: 7 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
The main terms used in the present standard are given as an example in Figures 1, 2, 3 and 4.
3.1
fixed ladder with two stiles
ladder, according to 3.1 of EN ISO 14122-1, which is stationary and where the rungs are arranged between and
attached to the stiles. The stiles carry the load (see Figure 2)
3.2
fixed ladder with one stile
ladder, according to 3.1 of EN ISO 14122-1, which is stationary and where the rungs are attached to both sides of
the stile. The stile carries the load alone (see Figure 3)
3.3
ladder flight
continuous part of the fixed ladder (see Figure 1):
between arrival and departure area, in the case of ladders without platforms; or
between the arrival area respectively departure area and the nearest platform; or
between rest platforms following each other
3.4
climbing height H of a fixed ladder
total vertical distance between the walking surface of the arrival area at the top of the ladder(s) and the walking
surface of the departure area at the base of the ladder(s) (see Figure 1)
3.5
height h of the ladder flight
vertical distance between the level at the beginning and the level at the end of each flight (see Figure 1)
3.6
fall protection
technical measure to prevent or reduce the risk of people falling from fixed ladders
NOTE Commonly used fall protection devices are defined in 3.6.1 and 3.6.2.
3.6.1
safety cage
assembly which serves to limit the risk of people falling from the ladder (see Figure 2)
3.6.2
guided type fall arrester on a rigid anchorage line
fall arrester
protective equipment fixed to ladder used in combination with personal protective equipment that everyone has
available before being allowed to use the ladder. (See also definition in EN 353-1 and EN 363)
In the following text the abbreviation "fall arrester" will also be used for this type of fall protection device.
3.7
arrival level
upper level of the surroundings or of the intermediate platform to which, the person steps after the ascent (see
Figure 1)
3.8
departure level
lower level of the surroundings or of the intermediate platform from which the person starts to climb the fixed ladder
(see Figure 1)
6
---------------------- Page: 8 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
3.9
intermediate platform
horizontal structure (platform) between two consecutive flights of a ladder (used with ladders having staggered
flights) (see Figure 1 and 4b)
3.10
rest platform
area equipped with the required protective means designed so that the user of the ladder can have a physical rest
(See Figures 1b, 10, 11 and 12)
3.11
access platform
horizontal structure at the arrival or departure area used by a person for means of access
3.12
trap door
normally closed device which can be opened to give access through a platform or through other similar horizontal
structures
7
---------------------- Page: 9 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Position of the rest platforms
Dimensions in millimetres
H = 10000 mm h = 6000 mm
max max
Figure 1.a : Ladder without rest platform Figure 1.b : Ladder with staggered flights
(single flight)
Key
1 Arrival area
2 Departure area
3 Intermediate platform or rest platform
4 Ladder flight
Figure 1 — Height of flights and location of platforms
8
---------------------- Page: 10 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Key
1 Anchor bracket
2 Rung
3 Ladder stile
4 Safety cage vertical members
5 Lowest hoop
6 Intermediate hoop
7 Toe plate
8 Platform step
9 Gate
10 Upper hoop
[A] Exit section
[B] Safety cage
Figure 2 — Terminology
9
---------------------- Page: 11 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Key
1 Stile
2 Rung
3 Protective device against slipping-off
4 Anchor point
Figure 3 — Example of a ladder less than 3000 mm with one stile
4 Safety requirements
4.1 General requirements
The materials, dimensions of constituent elements and construction mode used shall meet the safety objectives of
this standard.
Ladders shall be designed to meet the same installation requirements as the machine, taking into consideration
where necessary, conditions such as harsh environment, vibrations, etc.
As far as possible, fixed ladders should be designed with two stiles. In exceptional circumstances (e. g. a
continuous ladder with a varying angle of pitch or insufficient space to provide two stiles), fixed ladders may be
provided with only one stile.
All parts likely to be in contact with users shall be designed so as not to catch, hurt or hinder i. e. sharp corners,
welds with burrs, or rough edges, etc. should be avoided. Opening or closing the mobile parts (gate) shall not
cause further hazards (e. g. shearing or accidental falling) for persons using the ladder and those in the vicinity.
Fittings, hinges, anchor points, supports and mounting points shall hold the assembly sufficiently rigid and stable to
ensure the safety of users under normal conditions of use.
4.2 Strength of fixed ladders
4.2.1 General requirements
A ladder, platform and safety cage (when installed) shall meet the following design requirements:
10
---------------------- Page: 12 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
4.2.1.1 Ladder element
The ladder elements are considered to fulfil the requirements mentioned in 4.2.1 when they meet the requirements
of EN 131-2. The maximum deflection as indicated in 5.1 shall not exceed 50 mm.
In case of fixed ladders with one stile instead of the lateral bending test (see 4.4 of EN 131-2:1993) a torsion test
shall be made by application of two test loads each 400 N. The deflection of the ladder shall not exceed 20 mm
(see 5.4.3 and Figure 16). For the rungs, the load is applied on a length of 100 mm close to the lateral devices
against slipping off. The residual deflection of the rungs shall be not more than 0,3 % related to the length of the
rung (see 5.4.2, and Figure 15).
4.2.1.2 Safety cage
The safety cage is considered to meet these requirements if the permanent deformation as the result of a vertical
load of 1000 N is not more than 10 mm and as the result of a horizontal load of 500 N is not more than 10 mm.
(see 5.3 and Figure 13).
4.2.1.3 Fixed ladders equipped with a fall arrester
In addition to the requirements of 4.2.1.1, the combination of fall arrester and ladder shall be capable of stopping
the user from falling (see Clause 5).
4.2.2 Fixing elements
4.2.2.1 General
Fixing elements such as fittings, anchorage points, hinges, supports and mountings shall hold the assembly
sufficiently rigid and stable to ensure the safety of user under normal conditions of use (see verification in 5.5).
In case of fixed ladders equipped with a fall arrester the connecting elements shall withstand the stresses caused
by the fall arrester catching the person who falls down.
4.2.2.2 Anchoring points of fixed ladders
The anchoring points and connections to them shall be capable of supporting 3000 N per stile. Up to four
anchorages may be considered to contribute to this support. See 5.5 for the test method.
11
---------------------- Page: 13 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
4.2.3 Platforms
All platforms shall comply with the requirements of EN ISO 14122-2.
Dimensions in millimetres
Figure 4a — Side elevation on ladder with a safety cage
12
---------------------- Page: 14 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Dimension in millimetres
Figure 4b — Front elevation on ladder with safety cage
13
---------------------- Page: 15 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Dimensions in millimetres
Figure 4.c – Plan view of a ladder with a safety cage
Dimensions in millimetres
Figure 4.d – Plan view of a ladder without safety cage
Key
1 Connection element
2 Gate
3 Discontinuous obstacle
4 To suit maximum open area ≤ 0,4 m²
5 Intermediate platform
Figure 4 — Principal dimensions of ladders and safety cages
14
---------------------- Page: 16 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Dimensions in millimetres
Key
1 See 4.4.1.1
2 See 4.4.1.2 and Figure 6.a
3 Discontinuous obstacle
Figure 5 — Principal dimensions of a fixed ladder with one stile
4.3 Conditions for installation of an fall protection device
4.3.1 Conditions requiring the installation of an fall protection device
The ladder shall be fitted with a fall protection device when:
a) height of the ladder flight is more than 3000 mm;
b) height of the ladder is 3000 mm or less, but at the departure area there is the risk of falling an additional
distance. In this case, the total distance of fall from the upper level of the ladder could be more than 3000 mm.
NOTE Risk of falling is considered to exist when the distance from the centre of the ladder to the unprotected side of a
platform (or similar structure) is less than 3000 mm.
15
---------------------- Page: 17 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
4.3.2 Choice of the type of fall protection device
Two main alternatives for protection of the users of fixed ladders against falls from a height are safety cages or fall
arresters:
The cage shall be the required choice, as it is a means which is always present and the actual safety function
is independent of the operator's actions,
Where it is not possible to use a cage, individual protective equipment shall be provided. The fall arrester is
only effective if the user chooses to use it. If a harness with an incompatible sliding system is used with a
guided type fall arrester, there will be a risk (requirements for information for use see Clause 6).
A fall arrester shall be designed only for low frequency and specialised access (e. g. maintenance).
NOTE An appropriate individual fall protection device is able to arrest a fall better than a cage.
4.4 Ladder
The principal dimensions of the ladder shall be determined in accordance with 4.4.1 to 4.4.4 (See also Figures 4
and 5).
4.4.1 Position of the rungs
4.4.1.1 Spacing between the rungs
The spacing between successive rungs shall be constant and shall be between 225 mm and 300 mm.
4.4.1.2 Spacing between rungs and the departure and arrival area
The distance between the walking surface of the departure area and the first rung shall not exceed the spacing
between two consecutive rungs.
NOTE In case of mobile machinery to be used on uneven ground, the distance between the walking surface of the
departure area and the first rung may be 400 mm max.
The top rung shall be positioned at the same level as the walking surface of the arrival area (see Figure 6a). If the
gap between the walking surface and the ladder is greater than 75 mm, a floor extension shall be provided at the
arrival area to reduce this gap.
4.4.1.3 Position of rungs of fixed ladders with one stile
The rungs at one side of the stile shall be on the same level as the respective rung at the opposite side of the stile
(see Figure 5).
16
---------------------- Page: 18 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
Dimension in millimetres
Figure 6.b — Design of polygonal rungs –
Figure 6.a — Position of top rung
Recommended mounting
Figure 6.c — Design of polygonal rungs — Mounting
Figure 6.d — Design of U-shaped profile rungs
for special use only
Key
1 Walking surface of the arrival area
2 Rung/tread surface
3 No sharp edges
Figure 6 — Position of rungs
4.4.2 Rungs
4.4.2.1 Position of polygonal and U-shaped rungs
Polygonal and U-shaped rungs shall be positioned so that the tread walking surface is horizontal (see Figure 6.b,
6.c and 6.d).
4.4.2.2 Length of the rungs
a) Length of rungs of fixed ladders with two stiles
The clear width between the two stiles shall be between 400 mm and 600 mm (see Figure 4). However, a shorter
length between 300 mm and 400 mm is permissible, in cases where the immediate environment makes it
17
---------------------- Page: 19 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
impossible to use 400 mm. Before a shorter length is considered a check should be carried out to see if it is
possible to find a more favourable position for the ladder allowing a clear width of 400 mm or more.
b) Length of rungs of fixed ladders with two stiles and a fall arrester.
The clear width between the stiles and the rigid anchorage line for a guided type fall arrester shall be at least
150 mm and the thickness of the anchorage line shall not be more than 80 mm (see Figure 7).
Dimension in millimetres
Key
1 Rigid anchorage line
2 Stile
3 Rung
Figure 7 — Length of the rungs of a fixed ladder with two stiles and a rigid anchorage line for a guided type
fall arrester
c) Rungs of fixed ladders with one stile
The clear width between the stile and the protective device against slipping-off shall be between 150 mm
and 250 mm and the thickness of the stile shall not be more than 80 mm (see Figure 5).
4.4.2.3 Cross-section of the rungs
The diameter of the rungs shall be at least 20 mm, or the walking surface of the tread of polygonal or U-shaped
rungs shall have a depth of at least 20 mm.
The cross-section of the rungs shall not be given dimensions difficult to grasp by hand. The diameter of the rung
shall not be more than 35 mm.
4.4.2.4 Surface of the rungs
The surface of the rungs shall not cause injuries, notably to hands, e. g. no sharp edges (see Figure 6.d).
18
---------------------- Page: 20 ----------------------
SIST EN ISO 14122-4:2005
EN ISO 14122-4:2004 (E)
The surface of the rung shall have a slip resistant walking surface. Special measures to prevent slipping may be
necessary when the risk of slipping is increased due to environmental conditions (oil, ice, etc.).
4.4.3 Devices against slipping-off
The ends of the rungs of fixed ladders with one stile shall be fitted with protective devices against sl
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.