Terminations for steel wire ropes - Safety - Part 3: Ferrules and ferrule-securing

This European Standard deals with the requirements for the ferrule-securing of eyes and endless loops.
It also deals with the requirements for ferrules for the ferrule-securing of eyes and endless loops.
This European Standard applies to the ferrule-securing of eye terminations formed either by a Flemish eye or turn-back eye and covers ferrules made of non alloy carbon steel, stainless steel, aluminium and copper.
This European Standard applies to slings and assemblies using steel wire ropes for general lifting applications up to and including 60mm diameter conforming to EN 12385-4, lift ropes conforming to EN 12385-5 and spiral strand ropes conforming to EN 12385-10.
Type testing of ferrule-secured systems and manufacturing quality control requirements are also specified.
This European standard deals with all significant hazards, hazardous situations and events relevant to this particular steel wire rope termination when used as intended and under conditions of use which are foreseeable by the manufacturer.
This standard applies to terminations of steel wire ropes with ferrules and ferrule-securing which are manufactured after the date of this publication.
NOTE   One design of ferrule-secured turn-back eye termination using an oval aluminium ferule which satisfies the requirements of this European Standard is given for information in annex A.

Endverbindungen für Drahtseile aus Stahldraht - Sicherheit - Teil 3: Pressklemmen und Verpressen

Diese Europäische Norm behandelt die Anforderungen für das Verpressen von Seilschlaufen und Endlosseilen.
Sie behandelt auch die Anforderungen an die Pressklemmen für das Verpressen von Seilschlaufen und Endlosseilen.
Diese Europäische Norm gilt für das Verpressen von Flämischen Augen und rückgebogenen Seilschlaufen und behandelt Pressklemmen aus unlegiertem Kohlenstoffstahl, nichtrostendem Stahl, Aluminium und Kupfer.
Diese Europäische Norm gilt für Anschlagseile und Stahldrahtseile mit verpresster Seil-Endverbindung für allgemeine Hebezwecke bis zu einem Durchmesser von 60 mm nach EN 12385 4, aus Aufzugsseilen nach EN 12385 5 und Spiralseilen nach EN 12385 10.
Die Baumusterprüfung des Pressklemmensystems und die Anforderungen an die Qualitätskontrolle bei der Herstellung sind ebenfalls festgelegt.
Diese Europäische Norm behandelt alle wesentlichen Gefährdungen, gefährlichen Situationen und Ereignisse, die für diese besondere Seil-Endverbindung von Bedeutung sind, wenn sie wie vorgesehen und unter Bedingungen, wie sie vom Hersteller als vorhersehbar gelten können, angewendet werden.
Diese Norm gilt für Seil-Endverbindungen mit Pressklemmen und für Verpressungen, die nach dem Erscheinungsdatum hergestellt wurden.
ANMERKUNG   Eine Ausführung von verpressten rückgebogenen Seilschlaufen, bei der eine ovale Aluminiumpressklemme verwendet wird und die die Anforderungen dieser Europäischen Norm erfüllt, ist in Anhang A zur Information
angegeben.

Terminaisons pour câbles en acier - Sécurité - Partie 3: Manchons et boucles manchonnées

La présente Norme européenne traite des prescriptions relatives au manchonnage des boucles manchonnées et des ?illets épissés.
Elle traite également des prescriptions relatives aux manchons utilisés pour le manchonnage des boucles et des ?illets épissés.
La présente Norme européenne s'applique au manchonnage des terminaisons a boucle formées d'un ?il flamand ou d'une boucle manchonnée a brins paralleles et traite des manchons constitués d'acier au carbone, d'acier inoxydable, d'aluminium et de cuivre non alliés.
La présente Norme européenne s'applique aux élingues et assemblages qui utilisent des câbles en acier pour des applications de levage générales jusqu'a et y compris un diametre de 60 mm conformément a l'EN 12385-4, des câbles pour ascenseurs conformément a l'EN 12385-5 et des câbles spiraloidaux conformément a l'EN 12385-10.
Des essais de type des systemes manchonnés et les prescriptions relatives au contrôle de qualité de fabrication sont également spécifiés.
La présente Norme européenne traite de tous les phénomenes dangereux et de toutes les situations et événements dangereux significatifs correspondant a cette terminaison de câble en acier particuliere lorsqu'elle est utilisée tel que prévu et dans les conditions d'utilisation prévisibles par le fabricant.
La présente norme s'applique aux terminaisons de câbles en acier a boucles manchonnées fabriquées apres sa date de publication.
NOTE   Un modele de terminaison a boucle manchonnée a brins paralleles utilisant un manchon ovale en aluminium satisfaisant aux prescriptions de la présente Norme européenne est donné pour information dans l'Annexe A.

Zaključki jeklenih žičnih vrvi – Varnost – 3. del: Stisne puše in stiskanje

General Information

Status
Withdrawn
Publication Date
31-Oct-2004
Withdrawal Date
10-Nov-2008
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
03-Nov-2008
Due Date
26-Nov-2008
Completion Date
11-Nov-2008

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SLOVENSKI STANDARD
SIST EN 13411-3:2004
01-november-2004
=DNOMXþNLMHNOHQLKåLþQLKYUYL±9DUQRVW±GHO6WLVQHSXãHLQVWLVNDQMH
Terminations for steel wire ropes - Safety - Part 3: Ferrules and ferrule-securing
Endverbindungen für Drahtseile aus Stahldraht - Sicherheit - Teil 3: Pressklemmen und
Verpressen
Terminaisons pour câbles en acier - Sécurité - Partie 3: Manchons et boucles
manchonnées
Ta slovenski standard je istoveten z: EN 13411-3:2004
ICS:
53.020.30 Pribor za dvigalno opremo Accessories for lifting
equipment
77.140.99 Drugi železni in jekleni izdelki Other iron and steel products
SIST EN 13411-3:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13411-3:2004

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SIST EN 13411-3:2004
EUROPEAN STANDARD
EN 13411-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2004
ICS 53.020.30; 77.140.99
English version
Terminations for steel wire ropes - Safety - Part 3: Ferrules and
ferrule-securing
Terminaisons pour câbles en acier - Sécurité - Partie 3: Endverbindungen für Drahtseile aus Stahldraht - Sicherheit
Manchons et boucles manchonnées - Teil 3: Pressklemmen und Verpressen
This European Standard was approved by CEN on 16 April 2004.
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
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13411-3:2004: E
worldwide for CEN national Members.

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
Contents
page
Foreword.4
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 List of hazards.8
5 Safety requirements and/or measures .8
5.1 Ferrule-secured system .8
5.1.1 General.8
5.1.2 Type testing.9
5.1.3 Instructions to be provided by the ferrule-secured system designer.10
5.2 Ferrules.10
5.2.1 Material .10
5.2.2 Dimensions.10
5.2.3 Manufacture and quality control of ferrule .10
5.2.4 Certificate .11
5.2.5 Marking .11
5.3 Ferrule-securing.11
5.3.1 General.11
5.3.2 Matching of ferrule to wire rope .11
5.3.3 Forming the eye .11
5.3.4 Pressing the ferrule .13
5.3.5 Quality control after pressing of the ferrule .13
6 Verification of the safety requirements and/or measures .14
6.1 Qualification of personnel .14
6.2 Tensile type test (FSET system designer) .14
6.3 Fatigue type test (FSET system designer) .14
6.4 Fatigue type test of Flemish eye ferrule-secured termination of crane hoist rope (FSET system
designer).14
6.5 Ferrule dimensions before pressing (Ferrule manufacturer).14
6.6 Manufacture and quality control of ferrule (Ferrule manufacturer).14
6.7 Ferrules (FSET or ferrule-secured endless loop manufacturer).14
6.8 Matching of ferrule to wire rope (FSET or ferrule-secured endless loop manufacturer) .14
6.9 Forming the eye (FSET or ferrule-secured endless loop manufacturer) .15
6.10 Pressing the ferrule (FSET or ferrule-secured endless loop manufacturer) .15
6.11 Quality control after pressing the ferrule(s) (FSET or ferrule-secured endless loop
manufacturer).15
7 Information for use .15
7.1 Marking .15
7.2 Certificate .15
Annex A (informative)  Specification for one design of turn-back eye ferrule-secured termination.16
A.1 General.16
A.2 Types of terminations .16
A.3 Ropes for this design of ferrule .18
A.3.1 General.18
A.3.2 Rope types.18
A.3.3 Metallic cross sectional area factor.18
A.3.4 Rope grade .18
A.3.5 Types of rope lay .18
2

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
A.4 Tubing.18
A.4.1 General.18
A.4.2 Material .18
A.4.3 Straightness .18
A.4.4 Wall thickness.19
A.5 Identification and dimensions of ferrules (unpressed) .19
A.6 Matching wire rope to ferrule .22
A.7 Making the eye termination .25
A.7.1 Positioning of ferrule (Types A and B).25
A.7.2 Pressing the ferrule.25
A.7.3 Ferrules after pressing.25
A.8 Information for use .27
A.8.1 Identification marks.27
A.8.2 Temperature limits.27
Annex ZA (informative)  Relationship of this European Standard with EU Directives.28
Bibliography.29



3

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
Foreword
This document (EN 13411-3:2004) has been prepared by Technical Committee CEN/TC 168 “Chains, ropes,
webbing, slings and accessories - Safety”, the secretariat of which is held by BSI.
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 2004, and conflicting national standards shall be withdrawn at the latest
by December 2004.
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.
Annex A is informative.
EN 13411 consists of the following parts:
Part 1: Thimbles for steel wire rope slings
Part 2: Splicing of eyes for wire rope slings
Part 3: Ferrules and ferrule-securing
Part 4: Metal and resin socketing
Part 5: U-bolt wire rope grips
Part 6: Asymmetric wedge socket
Part 7: Symmetric wedge socket

This is the first edition of this Part of this European Standard.
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, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

4

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
Introduction
This European Standard is a Type C Standard as stated in EN 1070
This European Standard has been prepared to provide a means of conforming with the essential requirements of
the Machinery Directive and associated EFTA regulations.
Purchasers ordering to this standard are advised to specify in their purchasing contract that the supplier operates
an independently verified quality assurance system to ensure themselves that products claimed to comply
consistently achieve the required level of quality.
It is understood that type testing of a ferrule-secured eye termination system is the responsibility of the ferrule-
secured eye termination system designer.
It is also understood that the ferrule supplier is responsible for ensuring that the material, design and quality of the
ferrule is in accordance with the ferrule-secured eye system designer’s specification.
Ferrule-secured eyes manufactured by the ferrule-secured eye termination producer in accordance with this
standard are permitted for use as rope terminations in the production of steel wire rope slings. They are also used
as terminations for steel wire rope assemblies for raising, lowering and supporting loads.
The steel wire rope terminations concerned and the extent to which hazards, hazardous situations and events are
covered are indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of the other standards, for steel wire rope
terminations that have been designed and produced according to the provisions of this type C standard.
5

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
1 Scope
This European Standard deals with the requirements for the ferrule-securing of eyes and endless loops.
It also deals with the requirements for ferrules for the ferrule-securing of eyes and endless loops.
This European Standard applies to the ferrule-securing of eye terminations formed either by a Flemish eye or turn-
back eye and covers ferrules made of non alloy carbon steel and aluminium.
This European Standard applies to slings and assemblies using steel wire ropes for general lifting applications up
to and including 60mm diameter conforming to EN 12385-4, lift ropes conforming to EN 12385-5 and spiral strand
ropes conforming to EN 12385-10.
Type testing of ferrule-secured systems and manufacturing quality control requirements are also specified.
This European standard deals with all significant hazards, hazardous situations and events relevant to this
particular steel wire rope termination when used as intended and under conditions of use which are foreseeable by
the manufacturer.
This standard applies to terminations of steel wire ropes with ferrules and ferrule-securing which are manufactured
after the date of this publication.
NOTE One design of ferrule-secured turn-back eye termination using an oval aluminium ferule which satisfies the
requirements of this European Standard is given for information in annex A.

2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 515, Aluminium and aluminium alloys - Wrought products - Temper designations
EN 1050:1996, Safety of machinery – Principles of risk assessment
EN 12385-1, Steel wire ropes - Safety - Part 1: General requirements
EN 12385-2:2002, Steel wire ropes – Safety – Part 2: Definitions, designation and classification
EN 12385-4, Steel wire ropes – Safety – Part 4: Stranded ropes for general lifting applications
EN 12385-5, Steel wire ropes – Safety – Part 5: Stranded ropes for lifts
EN 12385-10, Steel wire ropes – Safety – Part 10: Spiral ropes for general structural applications
EN ISO 12100-2, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical principles
(ISO 12100-2:2003)
6

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions in EN 12385-2:2002 apply together with the
following:
3.1
ferrule-secured eye termination (FSET)
eye formed at a rope end secured by means of a ferrule pressed on the rope
3.2
Flemish eye ferrule-secured termination
eye formed at a rope end secured by means of a ferrule pressed on the main body of the rope and the tail ends of
the strands from the Flemish eye
3.3
turn-back eye ferrule-secured termination
eye formed at a rope end secured by means of a ferrule pressed onto the main body of the rope and the tail end
3.4
ferrule-secured endless loop
loop secured by ferrules pressed on the overlapping rope ends resulting in an endless rope assembly
3.5
competent person
designated person, suitably qualified by knowledge and experience, and with the necessary instruction to ensure
that the required operations are correctly carried out
3.6
ferrule-secured system designer
person or organization that designs the ferrule-secured eye termination or ferrule-secured endless loop and
assumes responsibility for type testing
3.7
ferrule manufacturer
person or organization that manufactures ferrules for a ferrule-secured eye termination or ferrule-secured endless
loop system
3.8
ferrule-secured termination manufacturer
person or organization that manufactures the FSET and/or ferrule secured endless loop in accordance with the
ferrule-secured termination system designer’s instructions
7

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
4 List of hazards
This clause contains all the significant hazards, hazardous situations and events, as far as they are dealt with in
this standard, identified by risk assessment as significant for this type of steel wire rope termination and which
require action to eliminate or reduce the risk.
Accidental release of a load due to failure of a FSET puts at risk either directly or indirectly the safety or health of
those persons within the danger zone.
Table 1 contains those hazards that require action to minimise risk identified by risk assessment as being specific
and significant for ferrule-secured eyes and endless loops.
Table 1 — Hazards and associated requirements
Hazards identified in annex A of Relevant clause of annex A of Relevant clause/sub-clause of
EN 1050: 1996 EN ISO 12100-2:2003 this standard
1 Mechanical hazard 1.3 5
1e Inadequacy of 1.3 5
mechanical strength
27 Mechanical hazards and
hazardous events
27.4 Insufficient mechanical 4.1.2.3 5
strength of parts
27.6 Inadequacy of selection 4.1.2.5, 4.3.1 5, 7
of ropes and
accessories and their
inadequate integration
into the machine
27.8 Abnormal conditions of 4.2.4 6
assembly/testing/use/
maintenance
1.7 Puncture hazard 1.3 5.3.4,  5.3.5
5 Safety requirements and/or measures
5.1 Ferrule-secured system
5.1.1 General
The ferrule-secured system shall comply with the safety requirements and/or protection measures of this clause.
In addition the ferrule-secured systems shall be designed according to the principles of EN ISO 12100 for relevant
hazards but not significant, which are not dealt with in this document.
The ferrule-secured system designer shall carry out type testing in accordance with 5.1.2.
The ferrule-secured termination system designer shall provide instructions on how to produce the ferrule-secured
termination and/or the ferrule-secured endless loop.
The instructions shall at least cover those items given in 5.1.3 and be supported with a written declaration that the
system has passed the type testing requirements of 5.1.2.
In the particular case of oval ferrules with tapered ends used in the securing of the turn-back eye or endless loop
where the rope end is contained within the ferrule, the ferrule-secured system designer shall provide means
whereby the position of the rope end before and after pressing can be ascertained. This shall not include
verification by marking the rope. Only the parallel portion of a ferrule shall be considered load bearing.
8

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)
5.1.2 Type testing
5.1.2.1 Sampling
Where the ferrule design follows a mathematical progression throughout a given size range, rope diameter shall be
selected for testing to represent the lower and upper quartiles of that range.
Where the ferrule design does not follow a mathematical progression throughout a given size range, each rope
diameter within that range for which the system is designed shall be selected for testing.
For each rope diameter selected as above, the rope grade shall be the highest for which the system is designed
and at least three FSETs or three ferrule secured endless loops, whichever is the case, shall be tested.
NOTE 1 In the case of the FSET the number of tests is regarded as two when the test lengths have a FSET at both ends.
Additionally, sampling shall take into account whether the type of ferrule-secured termination is a turn-back eye or
Flemish eye or whether it is an endless loop, as follows:
a) Turn-back eye ferrule secured-termination
Testing shall be carried out on each of the basic rope types for which the system is designed. For each basic
rope type, testing shall be carried out on ropes having the lowest and highest metallic cross-sectional area
factors for which the system is designed.
NOTE 2 For the purposes of this standard there are four basic rope types, namely single layer rope, rotation-resistant rope,
parallel-closed rope and spiral strand rope, refer EN 12385-2 for definitions.
b) Flemish-eye ferrule-secured termination
Testing shall be carried out on single layer rope having the lowest and highest metallic cross-sectional area
factors for which the system is designed.

c) Ferule-secured endless loop
Testing shall be carried out on single layer rope having the lowest and highest metallic cross-sectional factor for
which the system is designed

5.1.2.2 Tensile test
When tested in accordance with 6.2 the FSET shall sustain a force of at least 90% of the minimum breaking force
of the rope.
NOTE A terminal efficiency of 90% is equivalent to a termination efficiency factor, K , of 0,9 which is used in the calculation
T
of WLL for slings
When tested in accordance with 6.2 the ferrule-secured endless loop shall sustain a force of at least 90% of twice
the minimum breaking force of the rope.
5.1.2.3 Fatigue test
When tested in accordance with 6.3 for 75 000 cycles followed by a tensile test in accordance with 6.2 the FSET
and endless loop shall sustain a force of at least 80% of the minimum breaking force of the rope.
Additionally for Flemish eye ferrule-secured terminations of crane hoist ropes a further fatigue test shall be
performed on an assembly comprising a solid thimble having a peripheral length equivalent to at least four rope lay
6
lengths. When tested in accordance with 6.4 the ferrule-secured termination shall withstand a minimum of 1x10
cycles and not exhibit a complete strand fracture.
9

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)

5.1.3 Instructions to be provided by the ferrule-secured system designer
The ferrule-secured system designer shall provide instructions on at least the following:
a) preparation of the rope end;
b) details of the rope(s) for which the system is designed;
c) matching of the ferrule material and size to the rope diameter and type;
d) positioning of the rope end;
e) procedure for ferrule-securing, i.e. pressing the ferrule;
f) alignment, condition and maintenance of the tooling;
g) procedure for removal of fins
h) dimensional requirements of the pressed ferrule;
i) marking limitations of the ferrule; and
j) temperature limits of the ferrule secured system.

5.2 Ferrules
5.2.1 Material
The material selected by the ferrule manufacturer shall be non-alloy carbon steel or aluminium and shall conform to
the same specification as that used by the ferrule-secured system designer when satisfying the type tests.
Non-alloy carbon steel shall be a fully-killed non-ageing normalized steel.
Aluminium shall be in condition F according to EN 515.
5.2.2 Dimensions
The dimensions of the ferrule shall be in accordance with those used by the ferrule-secured system designer when
satisfying the type tests.
5.2.3 Manufacture and quality control of ferrule
The tube from which ferrules are made shall be free from any cracks, folds and surface defects.
With the exception of steel ferrules for Flemish eyes, ferrules shall be produced to provide a seam-free hollow
product. Extrusion over mandrels with a bridge shall not be used. Electric resistance welding of steel tubes may
only take place for flemish eyes and shall be carried out prior to the tube drawing and normalizing processes.
For each batch of steel ferrules produced from the same cast of steel and heat treatment a sample ferrule shall be
selected and close flattened at ambient temperature, see figure 1. If the sample fails this test a further ten (10) or
3% of the batch of ferrules, whichever is the greater, shall be randomly selected, and all shall pass the flattening
test otherwise the whole batch shall be rejected.
10

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SIST EN 13411-3:2004
EN 13411-3:2004 (E)


Figure 1 — Close-flattened ferrules
5.2.4 Certificate
The ferrule manufacturer shall supply a certificate stating that the whole batch of ferrules conforms to the ferrule
secured system designer’s specification.
5.2.5 Marking
Each ferrule shall be marked with its size and the ferrule manufacturer’s name or mark except in the case of
ferrules for use with ropes smaller than 8mm diameter where the marking can be on the package.
5.3 Ferrule-securing
5.3.1 General
The procedure adopted by the manufacturer of the ferrule-secured eye termination or endless loop shall be in
accordance with 5.3.2 to 5.3.5 and the instructions provided by the ferrule-secured system designer.
Ferrule-securing shall be carried out by a competent person trained in ferrule-securing.
5.3.2 Matching of ferrule to wire rope
Determine the rope details from the documentation supplied with the rope, see EN 12385-1 and ensure that the
rope is within the scope of the ferrule-secured system as detailed by the ferrule-secured system designer. In some
cases it will also be necessary to determine the nominal metallic cross-sectional area factor of the rope, refer EN
12385 parts 4,5 & 10.
Follow the ferrule-secured system designer’s instructions to select the appropriate ferrule size, taking into account
the nominal or measured diameter of the rope, whichever is applicable.
5.3.3 Forming the eye
5.3.3.1 Flemish eye
The outer stra
...

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