EN ISO 3691-6:2015

SLOVENSKI STANDARD
01-februar-2016
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SIST EN ISO 3691-6:2014
SIST EN ISO 3691-6:2014/AC:2014
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Industrial trucks - Safety requirements and verification - Part 6: Burden and personnel
carriers (ISO 3691-6:2013)
Flurförderzeuge - Sicherheitstechnische Anforderungen und Verifizierung - Teil 6: Lasten
- und Personentransportfahrzeuge (ISO 3691-6:2013)
Chariots de manutention - Exigences de sécurité et vérification - Partie 6: Transporteurs
de charges et de personnel (ISO 3691-6:2013)
Ta slovenski standard je istoveten z: EN ISO 3691-6:2015
ICS:
53.060 Industrijski tovornjaki Industrial trucks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 3691-6
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2015
EUROPÄISCHE NORM
ICS 53.060 Supersedes EN ISO 3691-6:2013
English Version
Industrial trucks - Safety requirements and verification -
Part 6: Burden and personnel carriers (ISO 3691-6:2013)
Chariots de manutention - Exigences de sécurité et Flurförderzeuge - Sicherheitstechnische
vérification - Partie 6: Transporteurs de charges et de Anforderungen und Verifizierung - Teil 6: Lasten- und
personnel (ISO 3691-6:2013) Personentransportfahrzeuge (ISO 3691-6:2013)
This European Standard was approved by CEN on 7 October 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3691-6:2015 E
worldwide for CEN national Members.

Contents Page
Eurpean foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 4

European foreword
The text of ISO 3691-6:2013 has been prepared by Technical Committee ISO/TC 110 “Industrial trucks”
of the International Organization for Standardization (ISO) and has been taken over as EN
ISO 3691-6:2015 by Technical Committee CEN/TC 150 “Industrial Trucks - 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 April 2016, and conflicting national standards shall be
withdrawn at the latest by April 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 3691-6:2013.
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.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this
document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 3691-6:2013 has been approved by CEN as EN ISO 3691-6:2015 without any
modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
Requirements of the New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the clauses of
this standard, except clause 6.2.5 and with the exclusion of all references to ISO/TS 3691-8 confers,
within the limits of the scope of this standard, a presumption of conformity with the Essential
Requirements of that Directive and associated EFTA regulations.
WARNING: Other requirements and other EU Directives may be applicable to the products falling
within the scope of this standard.
INTERNATIONAL ISO
STANDARD 3691-6
First edition
2013-09-01
Industrial trucks — Safety
requirements and verification —
Part 6:
Burden and personnel carriers
Chariots de manutention — Exigences de sécurité et vérification —
Partie 6: Transporteurs de charges et de personnel
Reference number
ISO 3691-6:2013(E)
©
ISO 2013
ISO 3691-6:2013(E)
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety requirements and/or protective measures . 3
4.1 General . 3
4.2 Starting/moving. 3
4.3 Brakes . 4
4.4 Manual control actuators . 4
4.5 Power systems and accessories. 7
4.6 Operator and passenger positions .10
4.7 Stability .12
4.8 Protective devices .12
4.9 Visibility/lighting .13
4.10 Environmental conditions .14
4.11 Transport .15
5 Verification of safety requirements and/or protective measures .15
5.1 General .15
5.2 Functional verification .15
6 Information for use .16
6.1 General .16
6.2 Instruction handbook(s) .16
6.3 Marking .19
Annex A (informative) List of significant hazards.21
Bibliography .26
ISO 3691-6:2013(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL:  http://www.iso.org/iso/home/standards_development/
resources-for-technical-work/foreword.htm
The committee responsible for this document is ISO/TC 110, Industrial trucks, Subcommittee SC 2, Safety
of industrial trucks.
This first edition of ISO 3691-6, together with ISO 3691-1, ISO 3691-2, ISO 3691-3, ISO 3691-4, ISO 3691-5,
ISO/TS 3691-7 and ISO/TS 3691-8, cancels and replaces ISO 3691:1980, of which it constitutes a
technical revision.
ISO 3691 consists of the following parts, under the general title Industrial trucks — Safety requirements
and verification:
— Part 1: Self-propelled industrial trucks, other than driverless trucks, variable-reach trucks and burden-
carrier trucks
— Part 2: Self-propelled variable-reach trucks
— Part 3: Additional requirements for trucks with elevating operator position and trucks specifically
designed to travel with elevated loads
— Part 4: Driverless industrial trucks and their systems
— Part 5: Pedestrian-propelled trucks
— Part 6: Burden and personnel carriers
— Part 7: Regional requirements for countries within the European Community [Technical Specification]
— Part 8: Regional requirements for countries outside the European Community [Technical Specification]
iv © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
Introduction
This document is a type-C standard as stated in ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events
are covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or B standards,
the requirements of this type-C standard take precedence over the requirements of the other standards for
machines that have been designed and built according to the requirements of this type-C standard.
The ISO 3691 series of standards covers safety requirements and their verification for industrial trucks
as defined in ISO 5053.
Structure
An important step forward in the work on the ISO 3691 series of standards was the agreement to issue
a new structure of International Standards for industrial trucks having on one side basic standards for
all kinds of trucks (see Foreword) and on the other side independent standards to cover the respective
specific functions of industrial trucks, e.g. visibility, noise, vibration, electrical requirements, etc.
Assessment of hazards
The product needs to be designed in such a way that it is fit for its purpose or function and can be
adjusted and maintained without putting persons at risk when used under the conditions foreseen by
the manufacturer.
In order to properly design a product and to cover all specific safety requirements, the manufacturer will
have to identify the hazards that apply to his product and carry out a risk assessment. The manufacturer
will then need to design and construct the product taking this assessment into account.
The aim of this procedure is to eliminate the risk of accidents throughout the foreseeable lifetime of the
machinery, including the phases of assembling and dismantling where risks of accidents could also arise
from foreseeable abnormal situations.
In selecting the most appropriate methods, the manufacturer will need to apply the following principles,
in the order given here:
a) eliminate or reduce risks as far as possible by design (inherently safe machinery design and
construction);
b) take the necessary protective measures in relation to risks that cannot be eliminated by design;
c) inform users of any shortcoming of the protective measures adopted;
d) indicate whether any particular training is required;
e) specify any need to provide personal protection equipment;
f) refer to the appropriate user’s document for proper operating instructions.
Industrial trucks need to be designed to prevent foreseeable misuse wherever possible, if such would
engender risk. In other cases, the manufacturer’s instructions will need to draw the user’s attention to
ways shown by experience in which the machinery ought not to be used.
This part of ISO 3691 does not repeat all the technical rules which are state-of-the-art and which are applicable
to the material used to construct the industrial truck. Reference will also need to be made to ISO 12100.
ISO 3691-6:2013(E)
Legislative situation/Vienna Agreement
From the very beginning, the task of the working group was to revise ISO 3691:1980 and establish
worldwide basic standards to comply with the major legislative regulations in, for example, the EU,
Japan, Australia and North America.
Every effort was made to develop a globally relevant International Standard. That goal was achieved with
most of the issues. For several potential problem areas compromises were needed and will be needed in
the future. Where divergent regional requirements remain, these are addressed by ISO/TS 3691-7 and
ISO/TS 3691-8.
In order to ensure that the revised International Standard will be actively used in the ISO member
countries, worldwide, procedures are necessary to replace the existing national standards and technical
regulations by the revised International Standard. In the European Community, ISO and the European
Committee for Standardization (CEN) agreed on technical co-operation under the Vienna Agreement,
with the aim of replacing European Standards (EN) by International Standards. Other countries are
asked to make similar agreements to ensure that their national standards and technical regulations are
replaced by this International Standard.
Only by these actions will there be the guarantee that products in accordance with International
Standards can be shipped worldwide freely without any technical barriers.
vi © ISO 2013 – All rights reserved

INTERNATIONAL STANDARD ISO 3691-6:2013(E)
Industrial trucks — Safety requirements and
verification —
Part 6:
Burden and personnel carriers
1 Scope
This part of ISO 3691 gives safety requirements and the means for their verification for self-propelled
carriers designed for carrying burdens without lifting, as defined in ISO 5053, and/or personnel
carriers, having three or more wheels, a maximum speed not exceeding 56 km/h and a load capacity not
exceeding 5 000 kg (hereafter referred to as carriers or trucks).
This part of ISO 3691 is applicable to trucks equipped with a platform (which can be tilting) for the
purpose of carrying materials or with a number of seats for the purpose of transporting passengers.
It is not applicable to
— vehicles intended primarily for earth-moving or over-the-road hauling,
— driverless trucks,
— golf cars,
— tractors with a drawbar pull up to and including 20 000 N equipped with a platform for the purpose
of carrying materials.
This part of ISO 3691 deals with all significant hazards, hazardous situations or hazardous events, as
listed in Annex A, relevant to the applicable machines when used as intended and under conditions of
misuse which are reasonably foreseeable by the manufacturer.
It does not establish requirements for hazards that can occur when using trucks on public roads or when
operating in potentially explosive atmospheres.
Regional requirements, additional to the requirements given in this part of ISO 3691, are addressed in
ISO/TS 3691-7 and ISO/TS 3691-8.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 2867:2011, Earth moving machinery — Access systems
ISO 3287:1999, Powered industrial trucks — Symbols for operator controls and other displays
ISO 3411:2007, Earth-moving machinery — Physical dimensions of operators and minimum operator
space envelope
ISO 3795:1989, Road vehicles, and tractors and machinery for agriculture and forestry — Determination of
burning behaviour of interior materials
ISO 5010:2007, Earth-moving machinery — Rubber-tyred machines — Steering requirements
ISO 3691-6:2013(E)
ISO 5053, Powered industrial trucks — Terminology
ISO 6292:2008, Powered industrial trucks and tractors — Brake performance and component strength
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13564-1:2012, Powered industrial trucks — Test methods for verification of visibility — Part 1: Sit-on
and stand-on operator trucks and variable-reach trucks up to and including 10 t capacity
ISO 13849-1:2006, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design
ISO 15870:2000, Powered industrial trucks — Safety signs and hazard pictorials — General principles
ISO 20898:2008, Industrial trucks — Electrical requirements
ISO 21281:2005, Construction and layout of pedals of self-propelled sit-down rider-controlled industrial
trucks — Rules for the construction and layout of pedals
ISO 24135-1:2006, Industrial trucks — Specifications and test methods for operator restraint systems —
Part 1: Lap-type seat belts
1)
ANSI/ITSDF B56.8:2006, Safety Standard for Personnel and Burden Carriers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053 and ISO 12100 and the
following apply.
3.1
burden [personnel] carrier
mobile power-driven machine that is not self-loading, used for transporting material and/or personnel
on indoor and outdoor improved surfaces, but not for use on public roads
3.2
operator
designated person, trained and authorized, who is responsible for the movement and operation of
the carrier and, depending on the carrier type, can be transported by the carrier, or can be on foot
accompanying the truck or can be remote from the truck (remote-controlled by cables, radio, etc.)
3.3
normal operating position
position in which the operator is able to control all functions for driving as defined by the manufacturer
3.4
load capacity
maximum load, including the operator and passengers
3.5
capacity
operator and number of passengers permitted by the manufacturer
1) American National Standards Institute/Industrial Truck Standards Development Foundation.
2 © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
4 Safety requirements and/or protective measures
4.1 General
4.1.1 Overall requirements
Trucks shall comply with the safety requirements and/or protective measures of this clause. In addition,
the truck shall be designed according to the principles of ISO 12100 for relevant but not significant
hazards which are not dealt with by this document.
4.1.2 Normal climatic conditions
For truck operation, the following climatic conditions apply:
— average ambient temperature for continuous duty: +25 °C
— maximum ambient temperature, short term (up to 1 h): +40 °C
— lowest ambient temperature for trucks intended for use in normal indoor conditions: +5 °C
— lowest ambient temperature for trucks intended for use in normal outdoor conditions: −20 °C
— altitude: up to 2 000 m
4.1.3 Electrical requirements
Electrical systems and equipment shall be in accordance with ISO 20898, except where regional
requirements apply. See ISO/TS 3691-7 and ISO/TS 3691-8.
4.1.4 Edges and angles
There shall be no sharp edges or angles posing a hazard in the area of the operator in the normal
operating position or in the area of access and egress of operators or passengers and during normal
operation and daily checks.
4.1.5 Stored energy components
Components which store energy and would cause a risk during removal or disassembly, e.g. hydraulic
accumulator or spring applied brakes, shall be provided with a means of releasing the energy before
removal or disassembly.
4.2 Starting/moving
4.2.1 Unauthorized starting
Carriers shall be provided with a device (e.g. a key, a code, a magnetic card) that prevents starting
without that device.
4.2.2 Unintended movement
4.2.2.1 Parking brake
A parking brake shall be provided complying with 4.3.1.
4.2.2.2 Internal combustion engine-powered carriers
Internal combustion engine-powered carriers shall be fitted with a device that prevents the engine
being started while the transmission is engaged.
ISO 3691-6:2013(E)
4.2.2.3 Travel controls
Travel controls on internal combustion engine powered carriers shall be so arranged that on level
ground the carrier will not move from rest until the transmission has been engaged.
4.2.2.4 Powered travel movement
Powered travel movement of the carrier with a ride-on operator shall be possible only if the operator is
in the normal operating position.
Powered travel shall not occur automatically when the operator returns to the normal operator position(s)
without an additional operation, e.g. by requiring resetting the direction control or reactivating speed
control, etc.
4.2.2.5 Manual gearbox and manually operated clutch pedal
A carrier with an automotive-type manual gearbox and manually operated clutch pedal satisfies the
requirements of 4.2.2.2 and 4.2.2.4.
4.2.3 Speedometer
A speedometer shall be provided on ride-on carriers that have a maximum travel speed greater than 25 km/h.
4.3 Brakes
4.3.1 General
All carriers shall be designed with service and parking brakes complying with ISO 6292. The parking
brake shall be equipped with a system preventing unintentional release.
Emergency braking is subject to regional requirements, additional to the requirements of this part of
ISO 3691. See ISO/TS 3691-7 and ISO/TS 3691-8.
4.3.2 Stand-on carriers
Stand-on carriers shall be equipped with a brake system that will automatically engage upon release of
the brake actuating control by the operator. This system may serve as the service and parking brake.
4.3.3 Failure of the energy supply
Failure of the energy supply for the brake release shall not result in loss of braking for automatically
acting brakes. The brake shall be automatically applied in the event of failure of energy supply to this
brake system.
4.4 Manual control actuators
4.4.1 General
4.4.1.1 Consistency with the carrier motions
Movement of these controls, where practicable, shall be consistent with the carrier motions being
operated. They shall be confined within the plan view outline of the carrier or tiller.
4 © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
4.4.1.2 Multiple operators
If additional operating positions are fitted, i.e. more than one operator, the operation of these controls
shall only be possible from one operating position at a time, excepting the emergency disconnect switch,
which shall be operable from all positions.
4.4.1.3 Multiple operating positions
If more than one operating position is fitted for a single operator, the use of the controls of one operating
position shall preclude the use of the controls of other operating positions, excepting the emergency
disconnect switch, which shall be operable from all positions.
4.4.2 Travel and braking controls
4.4.2.1 General
The motion of the speed operating control shall be designed such that an increase in the movement
of the control increases the travel speed. When the control is released, it shall return to the neutral
position of the control actuator.
4.4.2.2 Sit-on carriers
Pedal operated travel and braking controls shall comply with ISO 21281.
4.4.2.3 Differential locking
For carriers fitted with a pedal-operated differential lock, depression of the pedal shall lock the
differential and it shall be unlocked by releasing the pedal. It shall be possible to unlock the differential
when the truck is moving.
4.4.2.4 Hand-operated direction control lever
The movement of a direction control lever shall correspond to the selected direction of travel.
4.4.2.5 Hand-operated accelerator control lever
The control lever shall be a hold-to-run control. It shall return to the neutral position when released.
Movement towards the front of the carrier or away from the operator shall increase speed.
4.4.2.6 Additional operation from outside the carrier
4.4.2.6.1 General
If travel control from outside the carrier is provided for the operator, the travel speed shall be limited to
6 km/h. These controls can be attached to the carrier or remote control can be provided. This operating
system can be made operable by means of a separate switch or automatically when the operator leaves
the normal operating position.
4.4.2.6.2 Security
If the control actuator is released, the drive unit shall switch off automatically and the brake shall be
engaged. Simultaneous operation from the operating positions shall be excluded.
ISO 3691-6:2013(E)
4.4.2.6.3 Additional requirements for cable-connected remote control
Length and layout of the cables shall allow the operator to operate from outside of the area of hazard
of the truck and have visibility of the path of travel. It shall not be possible for the cable to become
entangled with the wheels.
On a portable control panel, the control elements, with the exception of the emergency stop, shall be
guarded against unintentional operation.
4.4.2.6.4 Additional requirements for cableless control
The transmission range shall be adequate for the operator to operate from outside the area of hazard of
the truck and have visibility in the path of travel.
On the portable control panel, the control elements for movement, with the exception of the emergency
stop, shall be guarded against unintentional operation.
−9
The reliability level shall be at least 10 and the hamming distance shall be 2. The remote control shall
meet the requirements of ISO 13849-1, performance level (PL) c.
In case of communication being lost, the brake system shall engage within 0,5 s.
No control interference shall be possible when more than one truck is operating under remote control
at the same time.
4.4.2.6.5 Additional requirements for carriers with trailer coupling
The controls (e.g. rear touch device) shall be arranged such that the operator does not have to step
between the carrier and the trailer to operate them.
The rear touch device shall be secured against unintentional operation.
When operating the rear touch device, the carrier shall travel at a speed of not more than 2,5 km/h.
4.4.3 Steering controls
4.4.3.1 Direction
Clockwise rotation of the steering wheel or any equivalent movement of the steering control shall steer
the carrier to the right when driving forward.
For pedestrian-operated carriers fitted with a tiller, when travelling in the forward direction, clockwise
movement of the tiller shall steer the carrier to the right.
4.4.3.2 Failure of power supply
In the event of an interruption of the power supplied to the steering system (including a dead motor or
engine), it shall be possible to maintain the path being steered until the carrier is brought to a stop.
For carriers with a maximum travel speed above 20 km/h, the steering performance in the case of
power supply shall comply with ISO 5010.
4.4.4 Marking
For marking, graphic symbols for controls shall comply with 6.3.2.
6 © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
4.5 Power systems and accessories
4.5.1 Exhaust and cooling systems
4.5.1.1 Exhaust system
The exhaust system shall be designed in accordance with 4.6.4. The exhaust system shall be designed to
direct engine exhaust away from the operator position. Materials used in the vicinity of exhaust systems
shall not be flammable and shall be chosen and protected so that they are not adversely affected by heat
from the exhaust system.
4.5.1.2 Cooling system
The air flow through the cooling system shall be arranged so as to avoid discomfort to the
operator/passengers.
4.5.2 Fuel tank
4.5.2.1 Tank isolation
If a fuel tank is within or adjacent to the engine compartment and excessively high temperatures may
occur, the tank and/or filling arrangement shall be isolated from the electrical and exhaust systems by
suitable protection, e.g. a separate enclosure or baffles. The tank location and facilities for filling shall be
such that spillage or leakage will not drain into the engine or operator’s compartment or onto electrical
or exhaust system parts.
4.5.2.2 Fuel spillage
Fuel spillage shall not be possible under normal operating conditions.
4.5.3 Access to engine and other compartments
4.5.3.1 Engine cover
An enclosed engine compartment shall satisfy fan guarding requirements when the manufacturer’s
recommended routine maintenance is performed with the engine off. If a fan can start (e.g. temperature
switch) when the engine is off, the fan shall be guarded. A safety warning sign shall be provided, and
included in the operator’s handbook. Warnings shall comply with 6.3.3.4.
Access from underneath is considered guarded if the access ground clearance is less than 600 mm
between the underside of the truck and level ground.
4.5.3.2 Unintentional closure
Where unintentional closure could cause injury, access covers (i.e. traction battery or engine covers)
shall be provided with means of preventing unintentional closure.
4.5.4 Liquefied petroleum gas (LPG) carriers
LPG-powered trucks are subject to regional requirements, additional to the requirements of this part
of ISO 3691. See ISO/TS 3691-8.
4.5.4.1 Containers
The following applies to the containers of trucks powered by LPG.
a) LPG containers shall be either permanently fixed to the truck or removable.
ISO 3691-6:2013(E)
b) When LPG containers are removable, their fastenings shall permit easy handling and checking of
the installation after the exchange of containers.
c) Removable LPG containers that incorporate a pressure relief valve shall be so positioned on the
truck that the pressure relief valve opening is always in communication with the vapour space at
the top of the container. This may be accomplished, for example, by an indexing pin which positions
the container when the container is properly installed.
d) LPG containers shall be securely mounted to the truck to prevent movement. Fastening shall
withstand static loading of four times the filled container weight in any direction without permanent
visible deformation.
e) LPG containers shall be fitted on the truck such that exposure to abrasion, shock and the corrosive
action of the products handled by the truck is reduced.
f) LPG containers and their connections shall be installed such that there are no projections outside
the plan view outline of the truck.
g) If LPG containers are installed in a compartment, this compartment shall have permanent openings
at the bottom. The total surface area of these ventilation openings shall be at least 200 cm allowing
adequate ventilation to outside the truck.
h) If an additional LPG container is carried on the truck, it shall be secured in the same manner as the
main container.
i) LPG containers, whether fixed or removable, shall be equipped with a device to prevent unintentional
emission of gas or liquid, e.g. in the case of a pipe system failure. This does not apply to pressure-
relief valves.
j) Pipe fittings and accessories on LPG containers shall be protected against mechanical damage when
used as specified by the manufacturer.
k) The fuel take-off on the LPG container shall be equipped with an easily and quickly accessible
manually operated valve. The position and method of operation of this valve shall be clearly marked
on the valve handle or on the outside of the truck near the valve.
l) The fuel take-off shall be in a liquid form unless the LPG container and engine are specially equipped
for a direct vapour withdrawal.
m) Permanently mounted LPG containers to be filled by the user shall be fitted with the following:
— a pressure relief valve connected to the vapour space of the container that, when fitted inside
the compartments of trucks, shall have the discharge side of the relief valve piped to the
atmosphere away from the operator and that shall comply with 4.5.4.3 d);
— an 80 % fill stop valve;
— maximum level indicating devices that rely on bleeding to the atmosphere designed such that
the venting hole is no larger than 1,5 mm in diameter and that the parts of the device cannot be
completely withdrawn in normal gauging operations;
— maximum liquid level devices suitable for the LPG in use, indicating the maximum product level
and which shall not vent to the atmosphere.
n) LPG containers shall be positioned such that they are not exposed to the damaging effects of heat,
particularly heat from the engine or the exhaust system. If it is necessary to fit a heat shield, this
shall not inhibit ventilation.
8 © ISO 2013 – All rights reserved

ISO 3691-6:2013(E)
4.5.4.2 Piping
The following applies to the piping used on trucks powered by LPG.
a) Connecting piping and all associated parts shall be easily accessible, protected against excessive heat
radiation, damage and wear, and shall be flexible enough to withstand vibration and deformation in
service, as follows:
— piping shall be so arranged that damage or leaks are easily detectable and that checks and
maintenance can be carried out;
— piping shall be installed such that it cannot be damaged by any excessive heat radiation from
hot parts of the truck;
— fully rigid pipes shall not be used for connecting the container to equipment on the engine;
— piping shall be so arranged that there are no projections outside the plan view outline of the truck.
2)
b) Pressure hoses operating above 1 bar shall be supported at least every 500 mm. Rigid pipes shall
be supported at least every 600 mm.
c) Hoses, pipes and all connections operating at pressures above 1 bar shall be suitable for a working
pressure of 25 bar and shall withstand without bursting a test pressure of 75 bar. Hoses, pipes and
all connections operating below 1 bar shall withstand without bursting a test pressure of five times
the maximum working pressure.
d) Pressure shall not exceed the working pressure rating of components in any section of pipe work
containing LPG in liquid form between two shut-off valves that are closed; a pressure relief valve,
for example, or other suitable means may be used if necessary.
e) Aluminium piping shall not be used.
f) Hoses shall be as short as practical.
g) Pressure unions and joints operating above 1 bar shall be made of metal except for any constrained
sealing washers.
4.5.4.3 Equipment
The following applies to the equipment used on trucks powered by LPG.
a) The supply of gas shall be automatically cut off when the engine stops, irrespective of whether or
not the ignition system has been switched off.
b) For multi-fuel applications, the system shall be designed to avoid the possibility of LPG entering any
other fuel container and to shut off each fuel source before the alternative one is opened.
c) If the truck is equipped with two or more containers to supply fuel, they shall be connected via a
multi-way valve or other suitable means, so that LPG can only be drawn from one container at a
time. The use of two or more containers at the same time shall not be possible.
d) Pressure-relief valves or liquid-level indicators shall be installed such that they cannot discharge in
the direction of the operator or onto truck components that could be a source of ignition.
e) If corrosion of a part would interfere with its proper functioning, that part shall be provided with a
corrosion-resistant protective coating.
f) All fuel system components shall be firmly secured to the truck.
g) Pressure-reducing valves shall be readily accessible for inspection and maintenance.
2 5 2
2) 1 bar = 0,1 MPa = 0,1 N/mm = 10 N/m .
ISO 3691-6:2013(E)
h) The engine compartment shall be designed in accordance with 4.5.4.1 g), in order to avoid any LPG
accumulation.
4.6 Operator and passenger positions
4.6.1 Dimensions
The operator’s seat or standing position shall be so located that the operator, while operating the carrier,
has enough room to stay within the plan view outline of the carrier. The dimensions shall be of suitable
ergonomic shape to accommodate at least a 5th percentile to a 95th percentile of the population as
defined in ISO 3411:2007, Figures 1 to 4, within the plan view outline of the carrier. The seat shall not
extend beyond the plan view outline of the carrier.
The minimum distance from the top edge of the seat back to the plan view outline of the carrier shall be
50 mm (see Figures 1 and 2).
For stand-on pedestrian and centre controlled ride-on carrier, the tiller steering control in the normal
operating position may extend beyond the plan view
Dimensions in millimetres
a
Direction of travel.
Figure 1 — Minimum distance — Front-seated oper
...