FprEN 474-10

Earth-moving machinery - Safety - Part 10: Requirements for trenchers

This document together with FprEN 474-1:2021 deals with all significant hazards, hazardous situations and events relevant to trenchers as defined in Clause 3 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 supplemet or modify the requirements for trenchers.
This document deals with:
-   trenchers (3.1);
-   trenching equipment (3.2);
NOTE   In this document "trenchers" entails both " trencher" and "trenching equipment".
-   truck vacuum trenchers (3.1.2);
-   trenchers equipped with trencher backhoe equipment (3.3).
This document provides specific health and safety requirements of the trenching equipment itself and of the interface (e.g. mechanical, electric, hydraulic, controls) between the carrier-vehicle and its equipment as well as the interaction and effects on each other when used together (e.g. visibility).
This document does not apply to carrier-vehicles which are subject to other relevant regulations.
This document does not deal with continuous surface miners as defined in ISO 19224:2017, truck-trenchers that do not incorporate a vacuum extraction system or self-propelled ride-on and pedestrian controlled floor cutting-off machinery (e.g. ground saw) which are under the scope of EN 13862:2001+A1:2009.
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:
-   Transmission of power between self-propelled machinery (or tractor) and recipient machinery;
-   Laser;
-   Lightning.
This document is not applicable to trenchers which are manufactured before the date of publication of this document by CEN.

Erdbaumaschinen - Sicherheit - Teil 10: Anforderungen für Grabenfräsen

Dieser Teil von prEN 474 behandelt:
- selbstfahrende Anbaugrabenfräsen;
- Kombinationen aus Trägerfahrzeug (LKW, Traktor, Spezialfahrzeug) und einer Arbeitsausrüstung zum Ziehen von Gräben;
- auswechselbare Ausrüstung zum Grabenziehen, die an einer artverwandten Maschine (z. B. Kompaktlader) oder einem Kompaktwerkzeugträger angebracht ist.
- Bezüglich selbstfahrender Anbaugrabenfräsen behandelt dieser Teil alle spezifischen Gesundheits- und Sicherheitsanforderungen.
- Bezüglich Maschinen, die eine Kombination aus einem Trägerfahrzeug und einer (z. B. an einen LKW) angebauten oder (z. B. an einen Traktor) angehängten Arbeitsausrüstung zum Ziehen von Gräben sind, behandelt dieser Teil von prEN 474 alle spezifischen Gesundheits- und Sicherheitsanforderungen der Arbeitsausrüstung zum Ziehen von Gräben selbst und der Schnittstelle (z. B. mechanisch, elektrisch, hydraulisch, Stellteile) zwischen dem Trägerfahrzeug und seiner Arbeitsausrüstung sowie die Interaktion und die Wechselwirkungen zwischen ihnen bei gemeinsamer Verwendung (z. B. Standsicherheit, Sicht).
ANMERKUNG Trägerfahrzeuge unterliegen anderen Verordnungen (z. B. Straßenverkehrsordnung).
- Bezüglich artverwandter Maschinen behandelt dieser Teil spezifische Gesundheits- und Sicherheitsanforderungen der auswechselbaren Ausrüstung und der Schnittstelle mit der artverwandten Maschine oder dem Werkzeugträger.
- Bei diesen Maschinen behandelt dieser Teil nicht die Erdbaumaschine selbst, die anderen Normen unterliegen kann (z. B. prEN 474-3 für Kompaktlader, prEN 474-4 für Baggerlader).

Engins de terrassement - Sécurité - Partie 10 : Prescriptions applicables aux trancheuses

Le présent document associé au FprEN 474-1:2021 traite de tous les phénomènes dangereux significatifs, situations dangereuses et événements se rapportant aux trancheuses telles que définies à l'Article 3, lorsqu'elles sont utilisées normalement et dans les conditions prévues, mais en tenant également compte des mauvais usages raisonnablement prévisibles par le fabricant (voir Annexe A), associés à toute la durée de vie de l'engin, comme 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 trancheuses.
Le présent document traite :
-   des trancheuses (3.1) ;
-   des équipements de creusement de tranchée (3.2) ;
NOTE   Dans le présent document, le terme « trancheuses » englobe à la fois la trancheuse elle-même et les équipements de creusement de tranchée.
-   des trancheuses aspiratrices excavatrices (3.1.2) ;
-   des trancheuses équipées d'une pelleteuse (3.3).
Le présent document fournit des prescriptions spécifiques de santé et de sécurité relatives à l'équipement de creusement de tranchée en lui-même et à l'interface (par exemple, mécanique, électrique, hydraulique, commandes) entre le véhicule porteur et son équipement, ainsi qu'à l'interaction et aux effets de l'un sur l'autre lorsqu'ils sont utilisés ensemble (par exemple, visibilité).
Le présent document ne s'applique pas aux véhicules porteurs qui sont soumis à d'autres réglementations applicables.
Le présent document ne traite pas des mineurs continus de surface tels qu'ils sont définis dans l'ISO 19224:2017, des trancheuses sur camion qui ne comportent pas de système d'extraction par aspiration ou des engins automoteurs de découpe du sol à opérateur porté et à opérateur accompagnant (par exemple, scie à sol) qui sont couverts par l'EN 13862:2001+A1:2009.
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 :
-   Transmission de puissance entre la machine automotrice (ou le tracteur) et la machine réceptrice ;
-   Laser ;
-   Foudre.
Le présent document n'est pas applicable aux trancheuses fabriquées avant la date de publication du présent document par le CEN.

Stroji za zemeljska dela - Varnost - 10. del: Zahteve za rovokopače

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 474-10:2017 - Earth-moving machinery - Safety - Part 10: Requirements for trenchers

RELATIONS

• Revised: EN 474-10:2006+A1:2009 - Earth-moving machinery - Safety - Part 10: Requirements for trenchers
• Effective Date: 11-Feb-2015

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 474-10:2017
01-junij-2017
6WURML]D]HPHOMVNDGHOD9DUQRVWGHO=DKWHYH]DURYRNRSDþH
Earth-moving machinery - Safety - Part 10: Requirements for trenchers
Engins de terrassement - Sécurité - Partie 10 : Prescriptions applicables aux
trancheuses
Ta slovenski standard je istoveten z: prEN 474-10
ICS:
53.100 Stroji za zemeljska dela Earth-moving machinery
oSIST prEN 474-10:2017 en,fr,de

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

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oSIST prEN 474-10:2017
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oSIST prEN 474-10:2017
DRAFT
EUROPEAN STANDARD
prEN 474-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2017
ICS Will supersede EN 474-10:2006+A1:2009
English Version
Earth-moving machinery - Safety - Part 10: Requirements
for trenchers
Engins de terrassement - Sécurité - Partie 10 :
Prescriptions applicables aux trancheuses

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 474-10:2017 E

worldwide for CEN national Members.
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oSIST prEN 474-10:2017
prEN 474-10:2017 (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 ....................................................................................................... 9

5 Safety requirements and/or measures ................................................................................................... 9

5.1 General ................................................................................................................................................................ 9

5.2 Operator’s station ........................................................................................................................................... 9

5.2.1 Non-riding trenchers ..................................................................................................................................... 9

5.2.2 Roll -over protective structure (ROPS) for ride-on machinery ...................................................... 9

5.3 Operator's seat ................................................................................................................................................. 9

5.3.1 General ................................................................................................................................................................ 9

5.3.2 Adjustment of seat with a transversal position ................................................................................... 9

5.3.3 Swivel seat ......................................................................................................................................................... 9

5.4 Operator’s controls ...................................................................................................................................... 10

5.4.1 General ............................................................................................................................................................. 10

5.4.2 Mode selector ................................................................................................................................................ 10

5.4.3 Working process controls ......................................................................................................................... 10

5.4.4 Additional requirements for truck-vacuum trenchers and truck-trenchers intended

to be used simultaneously by two operators ..................................................................................... 11

5.5 Stability ............................................................................................................................................................ 11

5.6 Moving parts .................................................................................................................................................. 11

5.6.1 General requirements ................................................................................................................................ 11

5.6.2 Specific requirements ................................................................................................................................. 14

5.7 Visibility........................................................................................................................................................... 15

5.8 Reel carrier-equipment ............................................................................................................................. 15

5.9 Continuous handling system .................................................................................................................... 15

5.10 Mounting of the trenching attachment ................................................................................................. 15

5.11 Maintenance/replacement of trenching attachment wear parts ............................................... 16

5.11.1 Machinery not requiring operating engine for maintenance operation .................................. 16

5.11.2 Machinery requiring operating engine for maintenance operation ......................................... 16

5.12 Warning devices and safety signs .......................................................................................................... 17

5.12.1 Warning devices ........................................................................................................................................... 17

5.12.2 Safety signs ..................................................................................................................................................... 17

5.13 Retrieval, transportation, lifting and towing ..................................................................................... 17

5.14 Additional requirements for truck-vacuum trenchers .................................................................. 17

5.14.1 Exemptions for truck-vacuum trenchers regarding prEN 474-1 ................................................ 17

5.14.2 Exemptions for truck-vacuum trenchers regarding prEN 474-10 ............................................. 18

5.14.3 Specific requirements for truck-vacuum trenchers ........................................................................ 18

5.15 Noise ................................................................................................................................................................. 21

5.15.1 Sound power level ........................................................................................................................................ 21

5.15.2 Sound pressure level at operator’s station ......................................................................................... 21

6 Verification of the safety requirements and/or protective measures ...................................... 21

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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)

7 Information for use ...................................................................................................................................... 24

Annex A (normative) List of additional significant hazards – Trenchers ................................................ 26

Annex B (informative) Illustrations ...................................................................................................................... 29

B.1 Trenchers with mechanized laying unit ............................................................................................... 29

B.2 Trenchers ........................................................................................................................................................ 31

B.3 Truck-vacuum trenchers ........................................................................................................................... 35

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 .................................................. 36

Bibliography ................................................................................................................................................................. 37

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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)
European foreword

This document (prEN 474-10:2017) 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 474-10:2006+A1:2009.

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 prEN 474 series and with

other specific part of the prEN 474 series if the carrier-vehicle is an earth-moving machinery (e.g.

prEN 474-3 for a compact loader, prEN 474-4 for a backhoe loader).
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oSIST prEN 474-10:2017
prEN 474-10:2017 (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 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 machines that have been designed and built according to the provisions of this type C

standard.
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)
1 Scope

This part of prEN 474 deals with all significant hazards, hazardous situations and events relevant to

trenchers as defined in EN ISO 6165:2012 and trenchers with mechanized laying unit, when they are used

as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see

Clause 4). It deals with:
— self-propelled integrated trencher;

— combinations of a carrier-vehicle (truck, tractor, special vehicle) and a trenching attachment;

— trenching interchangeable equipment fitted to a derivative machinery (e.g. compact loader) or a

compact tool carrier).

— For self-propelled integrated trencher, this part deals with all specific health and safety

requirements.

— For machinery which are a combination of a carrier-vehicle and a trenching attachment integrated

to it (e.g. to a truck) or mounted on it (e.g. on a tractor), this part of prEN 474 deals with all specific

health and safety requirements of the trenching attachment itself and of the interface (e.g.

mechanical, electric, hydraulic, controls) between the carrier-vehicle and its attachment as well as

the interaction and effects on each other when used together (e.g. stability, visibility).

NOTE Carrier-vehicles are subject to other regulations (e.g. road regulations).

— For derivative machinery, this part deals with specific health and safety requirements of the

interchangeable equipment and the interface with derivative machinery or tool carrier.

— For those machinery, this part doesn’t deal with the earth-moving machinery itself which can be

subject to other standards (e.g. prEN 474-3 for a compact loader, prEN 474-4 for a backhoe loader).

This European Standard does not deal with continuous surface miners as defined in ISO/CD 19224, truck-

trenchers that do not incorporate a vacuum extraction system and self-propelled ride-on and pedestrian

controlled floor cutting-off machinery (e.g. ground saw) which are under the scope of EN 13862.

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

trenchers 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).

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 trenchers.

This European Standard is not applicable to trenchers 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 795:2012, Personal fall protection equipment — Anchor devices
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)

EN ISO 3411:2007, Earth-moving machinery — Physical dimensions of operators and minimum operator

space envelope (ISO 3411:2007)

EN ISO 3471:2008, Earth-moving machinery — Roll-over protective structures — Laboratory tests and

performance requirements (ISO 3471:2008)

EN ISO 6682:2008, Earth-moving machinery — Zones of comfort and reach for controls (ISO 6682:1986,

including Amd 1:1989)

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

reduction (ISO 12100:2010)

EN ISO 1857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper

and lower limbs (ISO 13857:2008)

ISO 6393:2008, Earth-moving machinery — Determination of sound power level — Stationary test

conditions

ISO 6394:2008, Earth-moving machinery — Determination of emission sound pressure level at operator's

position — Stationary test conditions

ISO 13539:1998, Earth-moving machinery — Trenchers — Definitions and commercial specifications

3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 474-1:2017, ISO 13539:1998

and EN ISO 12100:2010 and the following apply.
3.1
trencher

self-propelled crawler or wheeled machine, having rear- and/or front-mounted equipment [attachment

(3.2)], primarily designed to produce a trench in a continuous operation, through motion of the machine

(see examples in B.1)

Note 1 to entry: The attachment can be a digging chain, disc, plough blade or similar tool (see EN ISO 6165:2012).

[SOURCE ISO 13539:1998, 3.1, modified to include 2nd sentence as NOTE 1 and reference to Figures

added]

Note 2 to entry: For trenching attachment combined with a carrier-vehicle, the carrier-vehicle can be a tractor, a

truck, an earth-moving machinery or other special vehicle.
3.2
trenching attachment

assembly of components for a making a trench (3.5) and which can be mounted onto either the base

machine, an earth-moving machinery or its equipment

[SOURCE: ISO 13539:1998, 3.7 modified to make it more specific to trencher and adding “an earth-

moving machinery”]
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)
3.3
trencher with mechanized laying unit

trencher designed and manufactured in order to produce in a single operation a trench and a mechanized

laying for simultaneous deployment of networks (e.g. pipes for gas, electricity, water or cables for

telecommunication) in urban or rural environment

Note 1 to entry: This machine can be fitted with a cable holder equipment, a cable guide equipment and a towing

device of slip formwork (see examples in B.2).
3.4
truck-vacuum trencher

combination of a trenching attachment and of a vacuum system integrated to a truck in order to produce

micro-trenches (see note in 3.5) and simultaneously remove and store debris (see example in B.3)

3.5
trench

narrow horizontal excavation for which, in general, the depth is greater than the width

[SOURCE: ISO 13539:1998, 3.2]
3.6
reel carrier-equipment

integral structure transporting and dispensing a spool of cables or other material during the trenching

operation (see examples in Figures B.1 to B.4)
[SOURCE: ISO 13539:1998, 5.1 modified to be more general]
3.7
continuous handling system

system integrated to the trencher and intended to evacuate materials coming from the trenching

application. This system is usually a belt conveyor or a combination of several belt conveyors (see

example in Figure B.13) but it can be also a pneumatic transportation equipment (see example in

Figure B.14)
3.8
working depth

trenching depth range of the trencher, from minimum depth to maximum depth, as defined by the

manufacturer in the instruction’s handbook
3.9
barrier

device reducing inadvertent contact with the trenching attachment and signalling the hazards due to the

rotating parts of the trenching attachment
3.10
extracted material area

zone where the material is discharged by the machine, as defined by the manufacturer in the instruction’s

handbook
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)
3.11
protective bar

structure generally above and parallel to the digging chain which provides a degree of protection from

contact with the digging element (see Figures B.8 to B.10 for example in Annex B)

Note 1 to entry: A protective bar can be a restraint bar or trench cleaner bar as shown in ISO 13539:1998,

Figure 5.
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

Trenchers shall comply with the relevant requirements of EN 474-1:2017, as far as not modified or

replaced by the requirements of this part.
5.2 Operator’s station
5.2.1 Non-riding trenchers
prEN 474-1:2017, 5.3.1.6 does not apply for non-riding machines.
5.2.2 Roll -over protective structure (ROPS) for ride-on machinery
prEN 474-1:2017, 5.3.3 only applies to ride-on seated trenchers.

Force and energy equation shall be according to EN ISO 3471:2008, Table 1, no. 1 or 3.

The operator’s station of trenchers with an elevating operator's station shall meet the relevant

requirements of prEN 474-1:2017, Annex B.
5.3 Operator's seat
5.3.1 General

prEN 474-1:2017, 5.4.1.2 shall apply with the following exemptions stated in 5.3.2 and 5.3.3 of this part.

5.3.2 Adjustment of seat with a transversal position
Fore and aft adjustment is not required.

In addition, the vertical adjustment shall meet the requirements in ISO 11112/Amd1.

5.3.3 Swivel seat

For seated ride-on equipment intended to be operated for long installations, typically base machine mass

greater than 3 000 kg, and where the operator shall look over his shoulder to see the attachment from

the driving position, a swivel seat shall be available.
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)
5.4 Operator’s controls
5.4.1 General

prEN 474-1:2016, 5.5.1 shall apply with the additions in the following 5.4.2 and 5.4.3.

5.4.2 Mode selector

In case of different operating modes (e.g. maintenance mode, working mode, road travelling mode), the

trencher shall be fitted with a mode selector.
This mode selector shall be lockable.

This may be in the form of a key-switch, lockable switch, access code, switch in a lockable cab or

compartment or other comparable means.

Any change of control mode shall reinitialize the machine controls and stop any hazardous movement.

The selected mode shall be indicated (e.g. position of the mode selector, lighting indicator, visual

indication on a screen).

NOTE 2 See also 5.4.4 “Additional requirements for trenchers intended to be used simultaneously by two

operators” and 5.12 “Maintenance mode”.
(See EN 60204-1:2006, 9.2.3).
5.4.3 Working process controls

For trenching operations, it may be ergonomically beneficial to have a control that is not hold-to-run.

Where the trenching ground drive is not a hold-to-run control, the design shall limit the maximum speed

to only the capabilities of the machine to perform its trenching function.

All controls shall return to their neutral position when the operator releases control of them unless the

functional control of the machine or its equipment dictates otherwise, such as needing a continuously

active function or a functionally related detent position.

When return to neutral controls are not provided, one of the following continuously monitoring means

shall be fitted to verify the presence of the operator at the controls:

— a means to detect the presence of the operator shall be installed (e.g. a seat switch), the delay time

before stopping shall be less than the time to reach the hazardous area from the operator’s station,

but enough time to prevent creating a nuisance for the operator. The delay shall be no longer than

10 s before movement is stopped

— a means to monitor the changes in control activation shall be installed. The delay time before

stopping the machine is 10 s and is automatically reset when the operator activates one control. If

the machinery is equipped with a remote control, this delay can be increased to no longer than 2 min

and 15 m. In that case, a visual or audible alarm shall inform the operator before the end of the delay.

Additionally, if inspection or operation from outside the cab is intended, the machinery shall be equipped

with a remote control.

In all case, if the presence of the operator is not detected, all hazardous movements of the machine shall

be stopped.
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)

5.4.4 Additional requirements for truck-vacuum trenchers and truck-trenchers intended to be

used simultaneously by two operators

For trenchers intended to be used simultaneously by two operators (e.g. truck-vacuum trenchers, see

example in B.3), the following additional requirements apply:

— a voice communication means shall be provided to allow continuous communication between the

two operators;

— a visibility system shall allow the driver to have a view to the trencher operator;

— the operational controls for trenching and driving/tramming shall not be duplicated at both operator

stations. Controls for engine start, stop and operation may be duplicated;

— where the trencher operation (trenching and/or transport/tramming) may be controlled via a

remote system (wired or wireless) and these controls are duplicated at one fixed operator station on

the machine, it shall not be possible for both control systems to operate the trencher simultaneously.

5.5 Stability

prEN 474-1:2017, 5.11 applies with the trenching attachment at the maximum attachment height and all

equipment, including the reel carrier-equipment weight in its most unfavourable operating conditions.

Where counterweights are required, the machine shall be designed to be installed in a stable and secured

position.
5.6 Moving parts

If prEN 474-1:2017, 5.2.2 is not fulfilled, the articulated frame parts of trenchers shall be protected either

by guard or protective device (e.g. pressure sensitive device).

Pressure-sensitive and electro-sensitive devices shall fulfil respectively the requirements of

EN ISO 13856- series and EN ISO 61496- series.

prEN 474-1:2017, 5.3.1.3 and 5.14.3 shall apply with the following additions/exemptions stated in 5.6.1

and 5.6.2 of this part.

NOTE The variation of depth, width, the position of the trenching attachment relative to obstacles (e.g. posts,

wall, gaps), and the use and type of continuous handling system, etc. are variables that reduce the possibility to fit

guards on the trenching attachment.
5.6.1 General requirements

To avoid material projections, to minimize the contact with upper and lower limbs and to reduce

entrapment, the trenching mechanism shall be provided with one or more of the following protective

means:
— a guard fitted at the upper part of trenching mechanism;
— barriers at the lateral parts;
— a protective bar along the top of the trenching mechanism;

— a sensitive protective device (e.g. electro-sensitive protective equipment or pressure sensitive

devices).

If any type of conveyor is able by design to deposit extracted earth where the mean height of the windrow

is at least 300 mm far away from the trenching attachment and not exceeding 1 000 mm, the formation

of this windrow may be considered as a barrier on that side.
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oSIST prEN 474-10:2017
prEN 474-10:2017 (E)

NOTE 1 A means to verify the above requirement would consist in measuring the distance from the end of

conveyor, auger, discharge chutes to the edge of the cutting tool.

NOTE 2 It is anticipated that protective devices, adopted from other technologies, will emerge during the lifetime

of the standard.
5.6.1.1 Guards

This guard shall be designed to cover at the maximum working depth, the upper part of the trenching

mechanism except at the extracted material opening.

In order to provide clearance on uneven terrain and to avoid damage of this guard, the clearance between

the guard and the ground level shall be 0 to 60 mm (see A dimension in Figure 1) if the debris are removed

outside the width of the machinery.

Mesh may be fitted instead of solid covers with an opening fulfilling the minimum safety distances in

accordance with EN ISO 13857:2008, Table 4.
5.6.1.2 Barriers

By exception to EN ISO 13857, these barriers shall fulfill at maximum working depth the following

requirements:

— be at least at 300 mm (see "C" dimension in two figures below) from the outermost point of the

moving parts of the chain or wheel;
— be at a horizontal position during the trenching operation.

Where required, barriers may be foldable or removable for specific application (e.g. near a bridge or

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