FprEN 474-12

Earth-moving machinery - Safety - Part 12: Requirements for cable excavators

This document together with FprEN 474-1:2021 deals with all significant hazards, hazardous situations and events relevant to cable excavators when used as intended and under the conditions of misuse which are reasonably foreseeable by the manufacturer (see Annex A) associated with the whole lifetime of the machine as described in EN ISO 12100:2010, 5.4 .
The requirements of this document are complementary to the common requirements formulated in FprEN 474-1:2021. This document does not repeat the requirements from FprEN 474-1:2021 but supplement or modify the requirements for cable excavators.
This document does not provide requirements for main electrical circuits and drives of machinery when the primary source of energy is an external electrical supply.
This document does not provide performance requirements for safety related functions of control system(s).
The following significant and relevant hazards are not covered in this document:
-   Laser;
-   Lightning.
Drilling and foundation equipment (covered by EN 16228-1:2014 to EN 16228-7:2014) are not dealt with in this document.
This document does not provide requirements for main electrical circuits and drives of machinery when the primary source of energy is an external electrical supply.
This document does not deal with demolition machinery.
This document is not applicable to cable excavators which are manufactured before the date of publication of this document by CEN.

Erdbaumaschinen - Sicherheit - Teil 12: Anforderungen für Seilbagger

Dieses Dokument behandelt zusammen mit Teil 1 alle signifikanten Gefährdungen für Erdbaumaschinen — Seilbagger (wie in EN ISO 6165 definiert), wenn sie bestimmungsgemäß verwendet werden sowie unter den vernünftigerweise vom Hersteller vorhersehbaren Fehlanwendungen für die gesamte Lebensdauer der Maschine (siehe Abschnitt 4).
Diese Europäische Norm gilt auch für Seilbagger und ihre Unter- und Oberwagen, wenn diese in Verbindung mit anderen Arbeitseinrichtungen oder -ausrüstungen wie Hebezeug, Ziehausrüstungen und Fahrwerken (z. B. Schienenfahrwerk, Schreitwerk, Ponton, Schiff) oder mit stationärem Unterbau betrieben werden sollen. Diese Norm behandelt keine Geräte für Bohr- und Gründungsarbeiten (die von den Teilen 1 bis 7 der EN 16228:2014 abgedeckt werden).
Die Anforderungen dieses Teils gelten ergänzend zu den allgemeinen Anforderungen der prEN 474-1. Dieses Dokument wiederholt nicht die Anforderungen der prEN 474-1, sondern ergänzt oder ersetzt diese für den Einsatz von Erdbaumaschinen — Seilbaggern.

Engins de terrassement - Sécurité - Partie 12 : Prescriptions applicables aux pelles à câbles

Le présent document associé au FprEN 474-1:2021 traite de tous les phénomènes dangereux significatifs, situations dangereuses et événements se rapportant aux pelles à câbles, lorsqu'elles sont utilisées normalement et dans les conditions prévues, mais en tenant également compte des mauvais usages raisonnablement prévisibles (voir Annexe A), associés à toute la durée de vie de l'engin, tel que décrit dans l'EN ISO 12100:2010, 5.4.
Les prescriptions du présent document viennent en complément des prescriptions communes présentées dans le FprEN 474-1:2021. Le présent document ne répète pas les prescriptions du FprEN 474-1:2021 mais complète ou modifie les prescriptions pour les pelles à câbles.
Le présent document ne spécifie aucune prescription relative aux circuits électriques principaux et aux commandes des engins lorsque la principale source d'énergie est une alimentation électrique externe.
Le présent document ne spécifie aucune prescription de performance relative aux fonctions de sécurité du (des) système(s) de commande.
Les phénomènes dangereux significatifs et pertinents suivants ne sont pas couverts par le présent document :
-   laser ;
-   foudre.
Les équipements de forage et de fondation (couverts par les normes EN 16228-1:2014 à EN 16228-7:2014) ne sont pas traités dans le présent document.
Le présent document ne spécifie aucune prescription relative aux circuits électriques principaux et aux commandes des engins lorsque la principale source d'énergie est une alimentation électrique externe.
Le présent document ne traite pas des engins de démolition.
Le présent document n'est pas applicable aux pelles à câbles fabriquées avant la date de publication du présent document par le CEN.

Stroji za zemeljska dela - Varnost - 12. del: Zahteve za bagre s kablom

General Information

• Status: Not Published
• ICS: 53.100 - Earth-moving machinery
• Technical Committee: CEN/TC 151 - Construction equipment and building material machines - Safety
• Drafting Committee: CEN/TC 151/WG 1 - Earth-moving machinery - Safety
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Due Date: 13-Jan-2022
• Completion Date: 13-Jan-2022
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: kSIST FprEN 474-12:2017 - Earth-moving machinery - Safety - Part 12: Requirements for cable excavators

RELATIONS

• Revised: EN 474-12:2006+A1:2008 - Earth-moving machinery - Safety - Part 12: Requirements for cable excavators
• Effective Date: 11-Feb-2015

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 474-12:2017
01-junij-2017
Stroji za zemeljska dela - Varnost - 12. del: Zahteve za bagre s kablom
Earth-moving machinery - Safety - Part 12: Requirements for cable excavators

Engins de terrassement - Sécurité - Partie 12 : Prescriptions applicables aux pelles à

câbles
Ta slovenski standard je istoveten z: prEN 474-12
ICS:
53.100 Stroji za zemeljska dela Earth-moving machinery
oSIST prEN 474-12:2017 en,fr,de

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

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oSIST prEN 474-12:2017
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oSIST prEN 474-12:2017
DRAFT
EUROPEAN STANDARD
prEN 474-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2017
ICS 53.100 Will supersede EN 474-12:2006+A1:2008
English Version
Earth-moving machinery - Safety - Part 12: Requirements
for cable excavators
Engins de terrassement - Sécurité - Partie 12 :
Prescriptions applicables aux pelles à câbles

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 151.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 474-12:2017 E

worldwide for CEN national Members.
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oSIST prEN 474-12:2017
prEN 474-12:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 List of additional significant hazards ....................................................................................................... 8

5 Safety requirements and/or measures ................................................................................................... 8

5.1 General ................................................................................................................................................................ 8

5.2 Operator's station ........................................................................................................................................... 8

5.2.1 General ................................................................................................................................................................ 8

5.2.2 Roll-over protective structures (ROPS) .................................................................................................. 8

5.2.3 Operator's protective guard ........................................................................................................................ 8

5.2.4 Operator's seat, vibrations .......................................................................................................................... 9

5.2.5 Visibility on stabilizers ................................................................................................................................. 9

5.3 Operator's controls and indicators ........................................................................................................... 9

5.3.1 Controls for driving and steering .............................................................................................................. 9

5.3.2 Operating mode ............................................................................................................................................... 9

5.4 Swing brakes ..................................................................................................................................................... 9

5.5 Lift system .......................................................................................................................................................... 9

5.5.1 Lifting and lowering operation .................................................................................................................. 9

5.5.2 Free-fall ............................................................................................................................................................ 10

5.5.3 Boom ................................................................................................................................................................. 13

5.5.4 Ropes, rope drum, rope pulley ................................................................................................................ 13

5.6 Limiting devices ............................................................................................................................................ 14

5.6.1 Limiting and indicating device for the lifting operation mode .................................................... 14

5.6.2 Limit switch for the boom hoist system ............................................................................................... 14

5.7 Stability ............................................................................................................................................................ 14

5.7.1 General ............................................................................................................................................................. 14

5.7.2 Calculation of tipping load ........................................................................................................................ 15

5.7.3 Stability in different applications........................................................................................................... 15

5.8 Requirements of safety related parts of the control system ........................................................ 17

5.9 Cable excavator with electrical power source ................................................................................... 17

5.10 Maintenance ................................................................................................................................................... 17

5.10.1 General ............................................................................................................................................................. 17

5.10.2 Control of winches when changing ropes ............................................................................................ 17

5.11 Access to operating positions, intervention and servicing points ............................................. 17

6 Verification ..................................................................................................................................................... 17

7 Information for use ..................................................................................................................................... 19

7.1 Operator’s manual ....................................................................................................................................... 19

Annex A (normative) List of additional significant hazards – Cable excavators .................................. 21

Annex B (normative) Requirements for cable excavator swing brakes .................................................. 23

B.1 General ............................................................................................................................................................. 23

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B.2 Terms and definitions ................................................................................................................................. 23

B.3 Minimum performance ............................................................................................................................... 24

B.3.1 Swing drive system ...................................................................................................................................... 24

B.3.2 Swing service brake ..................................................................................................................................... 24

B.3.3 Swing parking brake .................................................................................................................................... 25

B.4 Conditions for testing the swing service brake ................................................................................. 25

B.5 Test report ...................................................................................................................................................... 25

Annex C (informative) Illustrations ...................................................................................................................... 26

C.1 Standard applications ................................................................................................................................. 26

C.1.1 Crawler type cable excavator with lifting equipment ..................................................................... 26

C.1.2 Crawler type cable excavator with dragline equipment ................................................................ 27

C.1.3 Crawler type cable excavator with grab equipment ........................................................................ 27

C.2 Special applications ..................................................................................................................................... 27

C.2.1 Crawler type cable excavator with hole drilling equipment (casing oscillator) ................... 28

C.2.2 Crawler type cable excavator with piling equipment (hydraulic or diesel hammer) ......... 29

C.2.3 Crawler type excavator with wall cutter equipment (diaphragm wall grab) ......................... 30

C.3 Wheel type cable excavator in transport position for road travelling ...................................... 30

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 .................................................. 31

Bibliography ................................................................................................................................................................. 32

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oSIST prEN 474-12:2017
prEN 474-12:2017 (E)
European foreword

This document (prEN 474-12:2017) has been prepared by Technical Committee CEN/TC 151

“Construction equipment and building material machines - Safety”, the secretariat of which is held by

DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 474-12:2006+A1:2008.

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.
For bibliographic references, see prEN 474-1:2017.
EN 474 "Earth-moving machinery — Safety" comprises the following parts:
— Part 1: General requirements
— Part 2: Requirements for tractor-dozers
— Part 3: Requirements for loaders
— Part 4: Requirements for backhoe-loaders
— Part 5: Requirements for hydraulic excavators
— Part 6: Requirements for dumpers
— Part 7: Requirements for scrapers
— Part 8: Requirements for graders
— Part 9: Requirements for pipelayers
— Part 10: Requirements for trenchers
— Part 11: Requirements for earth and landfill compactors
— Part 12: Requirements for cable excavators
— Part 13: Requirements for rollers

This European Standard is intended for use in combination with part 1 of the series.

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oSIST prEN 474-12:2017
prEN 474-12:2017 (E)
Introduction
This part of prEN 474 is a type C standard as stated in EN ISO 12100:2010.

The machinery concerned and the extent to which hazards, hazardous situations and events are covered

are indicated in the scope of this European Standard.

When provisions of this type C standard are different from those stated in type A or B standards, the

provisions of this type C standard take precedence over the provisions of the other standards, for

machines that have been designed and built according to the provisions of this type C standard.

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oSIST prEN 474-12:2017
prEN 474-12:2017 (E)
1 Scope

This document, together with part 1, deals with all significant hazards for earth-moving machinery –

cable-excavators (as defined in EN ISO 6165) when they are used as intended and under the conditions

of misuse which are reasonably foreseeable by the manufacturer associated with the whole life time of

the machine (see Clause 4).

This European Standard applies also to cable excavators, their undercarriage and upper-structure, if

intended for use in combination with other equipment or attachment, such as lifting operation, extracting

equipment and moving equipment (e.g. rail track, walking legs, pontoon, ship) or stationary

undercarriage. Drilling and foundation equipment (covered by EN 16228-1:2014 to EN 16228-7:2014)

are not dealt with in this standard.

The requirements of this part are complementary to the common requirements formulated in

prEN 474-1. This document does not repeat the requirements from prEN 474-1, but adds or replaces the

requirements for application for earth moving machinery – cable-excavators.

This European Standard is not applicable to cable excavators manufactured before the date of publication

of this European Standard by CEN.
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.

prEN 474-1:2017, Earth-moving machinery — Safety — Part 1: General requirements

EN 16228-1:2014, Drilling and foundation equipment — Safety — Part 1: Common requirements

EN 13000:2010+A1:2014, Cranes — Mobile cranes

EN 60204-32:2008, Safety of machinery — Electrical equipment of machines — Part 32: Requirements for

hoisting machines

EN ISO 6165:2012, Earth-moving machinery — Basic types — Identification and terms and definitions (ISO

6165:2012)

EN ISO 7096:2008, Earth moving machinery — Laboratory evaluation of operator seat vibration (ISO

7096:2000)

EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk

reduction (ISO 12100:2010)

EN ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General

principles for design (ISO 13849-1:2015)

ISO 7546:1983, Earth-moving machinery — Loader and front loading excavator buckets — Volumetric

ratings

ISO 10262:1998, Earth-moving machinery — Hydraulic excavators — Laboratory tests and performance

requirements for operator protective guards
ISO 10567:2007, Earth-moving machinery — Hydraulic excavators — Lift capacity
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3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 474-1:2017,

EN ISO 12100:2010 and the following apply.

Note 1 to entry: Terminology for hydraulic excavators are specified in ISO 7135:2009 and illustrated in Annex C

of this European Standard.

Note 2 to entry: Definitions used in EN and ISO standards referred to in this European Standard are also valid for

this document.
3.1
cable excavator

excavator (see EN ISO 6165:2012), having a mainly wire rope-operated upper structure primarily

designed for excavating (e.g. with a dragline bucket, a front shovel or grab), for compacting material (e.g.

with a compaction plate), for demolition work (e.g. by hook or ball) and for material handling with special

equipment and attachment

Note 1 to entry: Cable excavators are earth-moving machines designed and constructed for this purpose. The

determination of the intended use by the machine manufacturer is significant for classification. Terms such as e.g.

“heavy duty crawler-crane” do not change the intended use determined by the machine manufacturer.

3.2
boom hoist system

consists of the boom and its adjustment mechanism, (e.g. lower-, intermediate- and head-section, the A-

frame system and the boom hoist winch system, hydraulic-mechanical adjustment mechanism)

3.3
lift system

consists of the main winch system used for earth-moving-, demolition-, compaction- and lifting operation

(e. g. with hook assembly) application
3.4
lifting and lowering operation

lifting and lowering of a load without disengaging the lifting drum and the lift drive system

3.5
free-fall

state of complete or partially controlled disengagement of the lifting drum and the lift drive system

3.6
free-fall function
function to enable free-fall
3.7
free-fall operation
state of the machine in which the free fall function can be activated
3.8
free-fall brake
mechanism where the drive can be disconnected from the drum
3.9
line pull
pulling force applied to a rope/cable
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prEN 474-12:2017 (E)
3.10
slow-release device

release of the load is made by a device in the machine and not directly linked to the released part of the

load
Note 1 to entry: e.g. disengagement of the free fall system of the machine
3.11
quick-release device

release of the load is made by a device directly linked to the released part of the load

Note 1 to entry: e.g. mechanical unlock of the lifted load
3.12
hoisting ropes
ropes designed to lift the load, mainly in vertical direction
3.13
digging ropes

ropes designed to pull the load, located on the ground (e.g. dragline bucket), mainly in horizontal/not

vertical direction
4 List of additional significant hazards
See Annex A.

NOTE Annex A (normative) contains all the significant hazards, hazardous situations and events, as far as they

are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and

which require action to eliminate or reduce the risk.
5 Safety requirements and/or measures
5.1 General

Cable excavators shall comply with the requirements of prEN 474-1:2017, as far as not modified or

replaced by the requirements of this part.
5.2 Operator's station
5.2.1 General
prEN 474-1:2017, 5.3 shall apply with the following modifications:
5.2.2 Roll-over protective structures (ROPS)
prEN 474-1:2017, 5.3.3 does not apply for cable excavators.
5.2.3 Operator's protective guard
prEN 474-1:2017, 5.3.4 shall be replaced by the following:

Cable excavators shall be designed so that an operator’s protective structure (top and front guard) can

be fitted.

A protective structure (top and front guard) shall be offered by the manufacturer and selected by the user

according to the existing risk of the application. The protective structures shall be in accordance with

ISO 10262:1998 (see Clause 7).
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5.2.4 Operator's seat, vibrations
prEN 474-1:2017, 5.4.1.4 shall apply with the following additions:

The seat shall meet the requirements of EN ISO 7096:2008, the input spectral class shall meet the class

EM 6 for the test excitation vibrations.
5.2.5 Visibility on stabilizers

Control devices (except remote controls) for extending/retracting the stabilizers (e.g. outriggers,

retractable crawlers) beams shall be in a position or provided with means where the movements of the

stabilizers can clearly be seen by the operator and from where crushing of the operator is not possible.

If the horizontal movement of the stabilizers is controlled from a fixed control on the ground level, it shall

only be possible to affect that movement on the side where the controls are situated.

5.3 Operator's controls and indicators
5.3.1 Controls for driving and steering
prEN 474-1:2017, 5.5.1 d) and 5.6.1 shall apply with the following addition:

The movements of the controls for driving and steering do not need to correspond to the intended

direction of movement if the upper structure is not in the normal driving direction.

5.3.2 Operating mode

Cable excavators intended for use in different modes shall be fitted with a lockable operating mode

selector for at least:
a) excavator operation mode;

NOTE Excavator operation mode may include e.g. excavating, compaction, demolition.

b) lifting operation mode.

The activation of the selected operation mode shall be optically indicated at the operator's station(s).

5.4 Swing brakes

Cable excavators shall be equipped with swing service and swing parking brake systems, which shall

meet the performance requirements as defined in Annex B.
5.5 Lift system
5.5.1 Lifting and lowering operation

The lift system of cable excavators shall be fitted with a brake, which actuates immediately after releasing

operational controls (e.g. levers or pedals).

In case of loss of energy during the lifting and lowering operation, the brake system shall act

automatically.

The stability of the machine shall not be put at risk during this operation and the structure (e.g. boom,

rope) shall not permanently deform.

The holding brake for hoisting and for derricking systems operated by winches shall be able to

exert a restraining torque at least 33 % greater than the maximum torque transmitted from the rope

drum to the brake under working or erection conditions, whichever is greater.
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Where the drive can be disconnected from the drum (e.g. by free fall brake) free fall of the load and/or

parts of the cable excavator shall be avoided by adequate means (e.g. interlocking arrangement).

5.5.2 Free-fall
5.5.2.1 General

The free fall system shall be designed that an uncontrolled run-up or run-off of the rope is avoided, e.g.

by a rope guide.

There shall be a specific lockable selector (e.g. could be integrated in the mode selector according to 5.3.2)

to enable/disable the free-fall operation.
NOTE Either one selector for all winches or one selector per winch.

If the lifting operation mode is selected, the control system shall be designed in such a way that the free-

fall function is not possible to be activated.

The procedure of free-fall operation and the activation is shown in Figure 1 and described in 5.5.2.3 to

5.5.2.5.
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oSIST prEN 474-12:2017
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Table 1 — Free-fall operation and activation procedure
5.5.2.2 Free fall brake
The lift system of cable excavators shall be fitted with a free fall brake.

The control of the free fall brake shall only be possible when the free-fall function is activated.

The free fall brake shall be designed that a dynamic load and a proportional actuation is possible.

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oSIST prEN 474-12:2017
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5.5.2.3 Activation/deactivation of free fall operation
There shall be no lowering at activating/deactivating the free-fall function.

The selector for the function "free-fall operation" shall be lockable and clearly identified.

The free fall function can be with an automatic deactivation or manual deactivation.

NOTE This can be realized by a separate control or integrated in the selector of the free fall function.

5.5.2.4 Manual free-fall operation
5.5.2.4.1 General
Manual free-fall operation shall only be possible for following conditions:
— free-fall operation is selected (see 5.5.2.1);
— free-fall function is activated.
The free-fall brake shall be activated immediately after:
— corresponding activation of the pedal control,

— release of controls (not for 5.5.2.4.3 Manual deactivation of free-fall function).

Activation of free-fall function shall only be possible by actuation of two independent controls

simultaneously (e.g. pedals and additional control).

Triggering after activation of the free-fall function shall be done by a separate control (e.g. by releasing

the pedals).
5.5.2.4.2 Automatic deactivation of free-fall function
Free-fall function is deactivated automatically for following conditions:
— hoist winch stands still,
and
— moving the control for winch to lifting position.
5.5.2.4.3 Manual deactivation of free-fall function
Free-fall function has to be deactivated manually by operator.
Triggering of free-fall after lifting can be done by the following options:

— automatic (triggering of free-fall will start automatically when returning the control for lifting to

neutral position),

— manual (triggering of free-fall will start by actuation by the operator after returning the control for

lifting to neutral position).

NOTE Triggering of free-fall will start by actuation by the operator can be done e.g. by releasing the brake

pedal.

The manual deactivation of the free-fall function shall be clearly indicated at the operator’s station.

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5.5.2.5 Automatic free fall operation for compacting materials

When a cable excavator is fitted with an automatic cycle mode, including free-fall operation (e.g. ramming

operations with a compaction plate), the activation of the automatic cycle mode shall be possible only

after selecting free-fall operation mode.

The cable excavator shall be equipped with a system to control the automatic cycle mode.

The control system shall be designed to:

— operate repeated and continuous ramming cycles, according to a sequence set by the operator;

— control the cycles (lifting, free fall, braking);

— automatically stop the operations when the initiated sequence has been completed;

— stop the initiated sequence when a fault or an abnormal behaviour is detected.
The control system shall not stop the cycle during the free fall.

If the automatic cycle is deactivated by an emergency stop or a device according to 5.3.1, the cycle shall

not be stopped during the free-fall.

Resetting, after a fault occurred in part of the control system, shall not restart the automatic operation.

Restarting of the automatic operation shall only be possible by an intentional action by the operator.

5.5.3 Boom

The boom of cable excavators shall be secured against repulsing in case of a sudden release of the load.

The connection (bolts) of the boom-pieces shall be so designed that mounting and disassembling can be

made without the need for a person staying under the boom.
5.5.4 Ropes, rope drum, rope pulley
5.5.4.1 General

The rope drum and rope pulley shall be built and designed so that trip-out of the rope is avoided when

used as intended.
There shall always remain at least three revolutions of rope on the winch drum.
5.5.4.2 Ropes
The ropes of cable excavators shall have safety factors according to Table 1.
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oSIST prEN 474-12:2017
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Table 1 — Safety factors of ropes
all modes hoisting or digging Boom holding ropes
of closing ropes
Operation with load Lifting the boom
operation, ropes
connected without load
except
lifting running stationary running stationary
mode and ropes rop
...