Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres

This European Standard applies to self-propelled and pedestrian propelled manual and semi-manual industrial trucks as defined in ISO 5053 1 including their load handling devices and attachments (hereafter referred to as trucks) intended for use in potentially explosive atmospheres.
NOTE 1   Attachments mounted on the load carrier or on fork arms which are removable by the user are not considered to be a part of the truck.
This European Standard specifies supplementary technical requirements for the prevention of the ignition of an explosive atmosphere of flammable gases, vapours, mists or dusts by industrial trucks of equipment group II and equipment category 2G, 3G, 2D or 3D.
NOTE 2   The relationship between an equipment category (hereafter referred to as category) and the corresponding zone (area classification) is shown in informative Annex B.
This European Standard does not include:
-   trucks of equipment group I;
-   trucks of equipment group II, equipment category 1;
-   trucks intended for use in potentially explosive atmospheres with hybrid mixtures;
-   protective systems.
This European Standard is not applicable to trucks intended for use in potentially explosive atmospheres of carbon disulphide (CS2), carbon monoxide (CO) and/or ethylene oxide (C2H4O) due to the special properties of these gases.
This standard is applicable to trucks intended for use in atmospheres with an ambient temperature range of   20 °C to +40 °C, i.e. trucks built in accordance with this European Standard will be satisfactory to any service conditions within this range unless otherwise specified.
NOTE 3   The ambient temperature range -20 °C to +40 °C is in line with EN ISO 3691 1.

Sicherheit von Flurförderzeugen - Einsatz in explosionsgefährdeten Bereichen - Verwendung in Bereichen mit brennbaren Gasen, Dämpfen, Nebeln oder Stäuben

Diese Europäische Norm gilt für motorkraftbetriebene und mitgängerbetriebene manuelle und halbmanuelle Flurförderzeuge, wie in ISO 5053 festgelegt, einschließlich deren Lastaufnahmemittel und abnehmbare Anbaugeräte (im Folgenden als Flurförderzeuge bezeichnet) für die bestimmungsgemäße Anwendung in explosionsgefährdeten Bereichen.
ANMERKUNG 1   Auf dem Lastenträger oder an den Gabelzinken angebrachte Anbaugeräte, die durch den Benutzer abnehmbar sind, gelten nicht als Teil des Flurförderzeugs.
Diese Europäische Norm befasst sich nur mit den technischen Anforderungen an die Verhinderung der Zündung einer explosionsfähigen Atmosphäre durch Flurförderzeuge der Gerätegruppe II und Geräte-kategorie 2G, 3G, 2D oder 3D.
ANMERKUNG 2   Der Zusammenhang zwischen einer Gerätekategorie (im Folgenden als Kategorie bezeichnet) und der jeweiligen Zone ist im informativen Anhang B dargestellt.
Die vorliegende Norm umfasst keine:
-   Flurförderzeuge der Gerätegruppe I;
-   Flurförderzeuge der Gerätegruppe II, Kategorie 1;
-   Flurförderzeuge, die zur Anwendung in explosionsgefährdeten Bereichen mit hybriden Gemischen vorgesehen sind;
-   Schutzsysteme.
Diese Norm gilt wegen der besonderen Eigenschaften dieser Gase nicht für Flurförderzeuge, die für den Einsatz in explosionsgefährdeten Bereichen mit Schwefelkohlenstoff (CS2), Kohlenmonoxid (CO) und/oder Ethylenoxid (C2H4O) vorgesehen sind.
Diese Norm gilt für Flurförderzeuge, die für den Einsatz in Atmosphären in einem Umgebungstemperatur-bereich von –20 °C bis +40 °C vorgesehen sind, d. h. entsprechend dieser Norm gebaute Flurförderzeuge sind in diesem Bereich unter allen Betriebsbedingungen zufriedenstellend einsetzbar, sofern es nicht anders festgelegt ist.
ANMERKUNG 3   Der Umgebungstemperaturbereich –20 °C bis +40 °C entspricht den Festlegungen von EN ISO 3691 1.

Chariots de manutention - Prescriptions de sécurité et vérification - Prescriptions supplémentaires pour le fonctionnement en atmosphères explosibles

La présente Norme européenne s'applique aux chariots automoteurs et aux chariots à conducteur à propulsion manuelle et semi-manuelle, tels que définis dans l'ISO 5053-1, y compris leurs dispositifs de manutention des charges et accessoires (désignés ci-après par « chariots ») destinés à être utilisés en atmosphères explosibles.
NOTE 1   Les accessoires démontables par l'utilisateur qui sont installés sur le porteur de charge ou sur les bras de fourche ne sont pas considérés comme faisant partie intégrante du chariot.
La présente Norme européenne spécifie les prescriptions techniques supplémentaires relatives à la prévention de l'inflammation d’une atmosphère explosive de gaz, vapeurs, brouillards ou poussières inflammables, dus aux chariots de manutention du groupe d’appareil II et de la catégorie d’appareil 2G, 3G, 2D ou 3D.
NOTE 2   La relation entre une catégorie d’appareil (désignée ci-après par « catégorie ») et la zone correspondante (classification de zone) est illustrée à l’Annexe B
La présente Norme européenne ne couvre pas :
   les chariots du groupe d’appareil I ;
   les chariots du groupe d’appareil II, catégorie d’appareil 1 ;
   les chariots destinés à être utilisés en atmosphères explosibles constituées de mélanges hybrides ;
   les systèmes de protection.
La présente Norme européenne n’est pas s'applicable aux chariots destinés à être utilisés en atmosphères explosibles contenant du sulfure de carbone (CS2), du monoxyde de carbone (CO) et/ou de l'oxyde d'éthylène (C2H4O), en raison des propriétés spécifiques de ces gaz.
La présente norme est applicable aux chariots destinés à être utilisés dans les atmosphères ayant une plage de température ambiante de - 20 °C à + 40 °C, c'est-à-dire que, sauf indication contraire, les chariots fabriqués conformément à la présente Norme européenne satisferont à toutes les conditions de service dans cette plage de température.
NOTE 3   La plage de température ambiante de - 20 °C à + 40 °C correspond à la norme EN ISO 3691-1.

Varnost vozil za talni transport - Obratovanje v potencialno eksplozivnih atmosferah - Uporaba v območju vnetljivega plina, pare, megle in prahu

Ta evropski standard velja za industrijska vozila z lastnim pogonom ter ročno in napol ročno gnana vozila (v nadaljevanju pogosto imenovana »vozila«) za uporabo v potencialno eksplozivnih atmosferah, vključno z njihovimi napravami za delo z bremenom in odstranljivimi priključki.
Vilice, nakladalne platforme ali integrirani priključki se obravnavajo kot deli vozila. Priključki, nameščeni na nosilec bremena ali na vilice, ki jih lahko odstrani uporabnik, se ne obravnavajo kot del vozila
Ta evropski standard obravnava le preprečevanje vžiga eksplozivne atmosfere s strani industrijskih vozil in opisuje dodatne zahteve za vozila skupine opreme II in kategorije opreme 2G, 3G, 2D in 3D.
Razmerje med kategorijami opreme in ustreznimi območji je prikazano v dodatku B.
Ta standard ne pokriva vozil za kategorijo 1 in vozil, namenjenih za uporabo v eksplozivnih atmosferah s hibridnimi mešanicami.
Vsa vozila, namenjena za uporabo v potencialno eksplozivnih atmosferah v obsegu tega evropskega standarda, morajo ustrezati zahtevam, podanim v tem evropskem standardu. Kjer lahko pride do dodatnih nevarnosti, bo izvedena ocena nevarnosti vžiga po standardu EN 13463-1:2009, pri čemer bodo upoštevane te posebne okoliščine in dodatne zahteve v standardu EN 13463-1:2009 ter po potrebi spremenjene v določenih delih standarda EN 13463 za druge vrste zaščite.
Ta evropski standard pokriva tehnične zahteve, potrebne za izogibanje ali zmanjšanje večjih nevarnosti, opredeljenih v dodatku A, do katerih lahko pride med običajnim delovanjem, vzdrževanjem ali predvidljivo nepravilno uporabo (skladno s podatki, ki jih zagotovi proizvajalec) industrijskih vozil.
Ta evropski standard ne velja za vozila, namenjena za uporabo v nevarnih atmosferah z ogljikovim disulfidom (CS2), ogljikovim monoksidom (CO) in/ali etilenoksidom (C2H4O) zaradi posebnih lastnosti teh plinov.
Vozila z oznako IIB + H2 in/ali C2H2 (vodik in/ali acetilen) so primerna tudi za atmosfero IIA ali IIB.
Ta evropski standard velja za atmosfere z razponom temperature v prostoru med -20 in +40 °C, tj. vozila, izdelana v skladu s tem evropskim standardom, bodo ustrezala poljubnim servisnim pogojem znotraj tega razpona, razen če ni določeno drugače.
OPOMBA Razpon temperature prostora (od -20 do +40 °C) je skladen s standardom EN 3691-1.

General Information

Status
Published
Publication Date
17-Nov-2015
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
18-Nov-2015
Completion Date
18-Nov-2015

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SLOVENSKI STANDARD
SIST EN 1755:2016
01-februar-2016
1DGRPHãþD
SIST EN 1755:2001+A2:2013
9DUQRVWYR]LO]DWDOQLWUDQVSRUW2EUDWRYDQMHYSRWHQFLDOQRHNVSOR]LYQLK
DWPRVIHUDK8SRUDEDYREPRþMXYQHWOMLYHJDSOLQDSDUHPHJOHLQSUDKX

Safety of industrial trucks - Operation in potentially explosive atmospheres - Use in

flammable gas, vapour, mist and dust
Sicherheit von Flurförderzeugen - Einsatz in explosionsgefährdeten Bereichen -
Verwendung in Bereichen mit brennbaren Gasen, Dämpfen, Nebeln oder Stäuben

Sécurité des chariots de manutention - Fonctionnement en atmosphères explosibles -

Utilisation dans des atmosphères inflammables dues à la présence de gaz, de vapeurs,

brouillards ou poussières inflammables
Ta slovenski standard je istoveten z: EN 1755:2015
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
53.060 Industrijski tovornjaki Industrial trucks
SIST EN 1755:2016 en,fr,de

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

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SIST EN 1755:2016
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SIST EN 1755:2016
EN 1755
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2015
EUROPÄISCHE NORM
ICS 53.060 Supersedes EN 1755:2000+A2:2013
English Version
Industrial Trucks - Safety requirements and verification -
Supplementary requirements for operation in potentially
explosive atmospheres

Chariots de manutention - Prescriptions de sécurité et Sicherheit von Flurförderzeugen - Einsatz in

vérification - Prescriptions supplémentaires pour le explosionsgefährdeten Bereichen - Verwendung in

fonctionnement en atmosphères explosibles Bereichen mit brennbaren Gasen, Dämpfen, Nebeln

oder Stäuben
This European Standard was approved by CEN on 24 July 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 1755:2015 E

worldwide for CEN national Members.
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SIST EN 1755:2016
EN 1755:2015 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

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

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

3 Terms and definitions ................................................................................................................................... 8

4 Safety requirements and/or protective measures .......................................................................... 11

4.1 General ............................................................................................................................................................. 11

4.2 Hot surfaces .................................................................................................................................................... 12

4.3 Safety shutdown ........................................................................................................................................... 13

4.4 Mechanically generated sparks .............................................................................................................. 13

4.5 Electrical system ........................................................................................................................................... 14

4.6 Internal combustion engines ................................................................................................................... 17

4.7 Electrostatic risks ........................................................................................................................................ 17

4.8 Requirements for brakes, clutches and couplings ........................................................................... 21

4.9 Requirements for pneumatic systems .................................................................................................. 23

4.10 Category 3G trucks equipped with restricted breathing enclosures “nR” and gas

detection systems ......................................................................................................................................... 23

4.11 Flammability of non-metallic materials .............................................................................................. 25

5 Verification of safety requirements and/or protective measures ............................................. 26

5.1 Determination of the maximum surface temperatures ................................................................. 26

5.2 Measurement of circuit resistance and capacitance ....................................................................... 30

6 Information for use ..................................................................................................................................... 32

6.1 General ............................................................................................................................................................. 32

6.2 Instruction handbook ................................................................................................................................. 32

6.3 Marking ............................................................................................................................................................ 34

6.4 Warning labels .............................................................................................................................................. 35

Annex A (normative) List of significant hazards ............................................................................................ 36

Annex B (informative) Relationship between zones (area classification) and truck categories . 37

Annex C (informative) Typical example of cladding of load handling devices ................................... 38

Annex D (informative) Typical examples of non-conductive surface areas according to 4.7.3.1 39

Annex E (normative) Requirements for transmission belts in accordance with ISO 9563 or

ISO 1813........................................................................................................................................................... 42

Annex F (informative) Significant technical changes between this document and the previous

edition of this European Standard ......................................................................................................... 43

Annex G (informative) Warning labels for trucks with restricted breathing enclosure(s) ........... 47

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 94/9/EC ............................................................................................... 48

Bibliography ................................................................................................................................................................. 51

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SIST EN 1755:2016
EN 1755:2015 (E)
European foreword

This document (EN 1755:2015) has been prepared 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 May 2016, and conflicting national standards shall be

withdrawn at the latest by November 2017.

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 1755:2000+A2:2013.

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(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.

Informative Annex F provides details of significant technical changes between this document and the

previous edition: EN 1755:2000+A2:2013.

This document is one of a series of European Standards for the safety of industrial trucks which are listed

in 4.1 and in the Bibliography.

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.
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SIST EN 1755:2016
EN 1755:2015 (E)
Introduction
This standard is a type-C standard as stated in EN ISO 12100.

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

covered, are indicated in the scope of this 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 in accordance with the provisions of this type C standard.

This standard (EN 1755:2015) covers safety requirements and their verification for industrial trucks as

defined in ISO 5053-1 that are not covered exhaustively by:
— EN 1459;
— EN 1526;
— EN 1757-3;
— EN ISO 3691-1;
— EN ISO 3691-5;
— EN ISO 3691-6;

NOTE The above-mentioned standards are listed in the Bibliography or in Clause 2.

Assessment of hazards

The industrial truck 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 (e.g.

explosive atmospheres) by the manufacturer.

In order to properly design an industrial truck and to cover all specific safety requirements, the

manufacturer will have to identify the hazards that apply to the industrial truck and carry out a risk

assessment. The manufacturer will then need to design and construct the industrial truck 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:

— eliminate or reduce risks as far as possible by design (inherently safe machinery design and

construction);

— take the necessary protective measures in relation to risks that cannot be eliminated by design;

— inform users of any shortcoming of the protective measures adopted;
— indicate whether any particular training is required;
— specify any need to provide personal protection equipment;
— refer to the appropriate user's document for proper operating instructions.
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SIST EN 1755:2016
EN 1755:2015 (E)

Industrial trucks need to be designed to prevent foreseeable misuse wherever possible, if such would

engender risk. In other cases, the instructions will need to draw the user's attention to ways shown by

experience in which the machinery ought not to be used.

This standard (EN 1755:2015) 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

EN ISO 12100.
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SIST EN 1755:2016
EN 1755:2015 (E)
1 Scope

This European Standard applies to self-propelled and pedestrian propelled manual and semi-manual

industrial trucks as defined in ISO 5053-1 including their load handling devices and attachments (hereafter

referred to as trucks) intended for use in potentially explosive atmospheres.

NOTE 1 Attachments mounted on the load carrier or on fork arms which are removable by the user are not

considered to be a part of the truck.

This European Standard specifies supplementary technical requirements for the prevention of the ignition

of an explosive atmosphere of flammable gases, vapours, mists or dusts by industrial trucks of equipment

group II and equipment category 2G, 3G, 2D or 3D.

NOTE 2 The relationship between an equipment category (hereafter referred to as category) and the

corresponding zone (area classification) is shown in informative Annex B.
This European Standard does not include:
— trucks of equipment group I;
— trucks of equipment group II, equipment category 1;

— trucks intended for use in potentially explosive atmospheres with hybrid mixtures;

— protective systems.

This European Standard is not applicable to trucks intended for use in potentially explosive atmospheres

of carbon disulphide (CS ), carbon monoxide (CO) and/or ethylene oxide (C H O) due to the special

2 2 4
properties of these gases.

This standard is applicable to trucks intended for use in atmospheres with an ambient temperature range

of - 20 °C to +40 °C, i.e. trucks built in accordance with this European Standard will be satisfactory to any

service conditions within this range unless otherwise specified.

NOTE 3 The ambient temperature range -20 °C to +40 °C is in line with EN ISO 3691-1.

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.

EN 1127-1:2011, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and

methodology

EN 1149-5, Protective clothing - Electrostatic properties - Part 5: Material performance and design

requirements

EN 1175-1:1998+A1:2010, Safety of industrial trucks - Electrical requirements - Part 1: General

requirements for battery powered trucks

EN 1175-2, Safety of industrial trucks ― Part 2: Electrical requirements for internal combustion engine

powered trucks

EN 1175-3, Safety of industrial trucks ― Part 3: Electrical requirements for the electric power transmission

systems of internal combustion engine powered trucks
EN 1459, Safety of industrial trucks ― Self-propelled variable reach trucks
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SIST EN 1755:2016
EN 1755:2015 (E)
EN 1525, Safety of industrial trucks - Driverless trucks and their systems

EN 1757-3, Safety of industrial trucks - Pedestrian controlled manual and semi-manual trucks - Part 3:

Platform trucks

EN 1834-1:2000, Reciprocating internal combustion engines - Safety requirements for design and

construction of engines for use in potentially explosive atmospheres - Part 1: Group II engines for use in

flammable gas and vapour atmospheres

EN 1834-3, Reciprocating internal combustion engines - Safety requirements for design and construction of

engines for use in potentially explosive atmospheres - Part 3: Group II engines for use in flammable dust

atmospheres

EN 13463-1:2009, Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic

method and requirements

EN 13463-3, Non-electrical equipment for use in potentially explosive atmospheres - Part 3: Protection by

flameproof enclosure 'd'

EN 13463-5:2011, Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5:

Protection by constructional safety 'c'

EN 13463-8, Non-electrical equipment for potentially explosive atmospheres - Part 8: Protection by liquid

immersion 'k'
EN 14986, Design of fans working in potentially explosive atmospheres

EN 50271, Electrical apparatus for the detection and measurement of combustible gases, toxic gases or

oxygen - Requirements and tests for apparatus using software and/or digital technologies

EN 60079-0:2012, Explosive atmospheres - Part 0: Equipment - General requirements ( IEC 60079-0:2011,

modified)

EN 60079-7, Explosive atmospheres - Part 7: Equipment protection by increased safety "e" (IEC 60079-7)

EN 60079-14:2014, Explosive atmospheres - Part 14: Electrical installations design, selection and erection

(IEC 60079-14:2012)

EN 60079-15:2010, Explosive atmospheres - Part 15: Equipment protection by type of protection "n" (IEC

60079 15:2010)

EN 60079-17, Explosive atmospheres ― Part 17: Electrical installations inspection and maintenance

(IEC 60079-17)

EN 60079-29-1:2007, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of

detectors for flammable gases (IEC 60079-29-1:2007)

EN 60079-29-2, Explosive atmospheres ― Part 29-2: Gas detectors ― Selection, installation, use and

maintenance of detectors for flammable gases and oxygen (IEC 60079-29-2)

EN 60079-31, Explosive atmospheres ― Equipment dust ignition protection by enclosure "t" (IEC 60079-31)

CLC/TR 60079-32-1, Explosive atmospheres - Part 32-1: Electrostatic hazards, guidance

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SIST EN 1755:2016
EN 1755:2015 (E)

EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)

EN 61508-1, Functional safety of electrical/electronic/programmable electronic safety-related systems - Part

1: General requirements (IEC 61508-1)

EN 61508-6, Functional safety of electrical/electronic/programmable electronic safety-related systems - Part

6: Guidelines on the application of IEC 61508-2 and IEC 61508-3 (IEC 61508-6)

EN ISO 3691-1, Industrial trucks - Safety requirements and verification - Part 1: Self-propelled industrial

trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks (ISO 3691-1:2011)

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

design (ISO 13849-1)

EN ISO 20344, Personal protective equipment - Test methods for footwear (ISO 20344)

ISO 284, Conveyor belts — Electrical conductivity — Specification and test method

ISO 1813, Belt drives — V-ribbed belts, joined V-belts and V-belts including wide section belts and hexagonal

belts — Electrical conductivity of antistatic belts: Characteristics and methods of test

ISO 9563, Belt drives — Electrical conductivity of antistatic endless synchronous belts — Characteristics and

test method

ISO 15870, Powered industrial trucks — Safety signs and hazard pictorials — General principles

3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
explosive atmosphere

mixture with air, under atmospheric conditions, of flammable substances in the form of gases, vapours,

mists or dusts in which, after ignition has occurred, combustion spreads to the entire unburned mixture

[SOURCE: EN 13237:2012, 3.28]
3.2
potentially explosive atmosphere
atmosphere which could become explosive due to local and operational conditions
[SOURCE: EN 13237:2012, 3.28.2]
3.3
hybrid mixture
mixture of flammable substances with air in different physical states
[SOURCE: EN 13237:2012, 3.40]
3.4
auto ignition temperature

lowest temperature (of a hot surface) at which under specified test conditions an ignition of a flammable

gas or flammable vapour in mixture with air or air/inert gas occurs
[SOURCE: EN 13237:2012, 3.45]
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EN 1755:2015 (E)
3.5
minimum ignition temperature of a dust cloud

lowest temperature of a hot surface on which the most ignitable mixture of the dust with air is ignited

under specified test conditions
[SOURCE: EN 13237:2012, 3.45.1]
3.6
minimum ignition temperature of a dust layer

lowest temperature of a hot surface at which ignition occurs in a dust layer under specified test conditions

[SOURCE: EN 13237:2012, 3.45.2]
3.7
service temperature

maximum or minimum temperature reached at specific points of the equipment when the equipment is

operating at rated conditions, including ambient temperature and any external sources of heating or

cooling
[SOURCE: EN 60079-0:2012, 3.50]

Note 1 to entry: Each equipment may reach different service temperatures in different parts.

Note 2 to entry: This definition applies to both electrical and non-electrical equipment and components.

3.8
maximum surface temperature

temperature used for marking of the equipment which is the highest temperature that can be attained in

service under the most adverse operating conditions (but within the recognized tolerance) by any part or

surface of equipment or protective system or component which can produce an ignition of the surrounding

explosive atmosphere with an appropriate safety margin
[SOURCE: EN 13463-1:2009, 3.9]

Note 1 to entry: The manufacturer will prescribe the product standard and also in his particular design he should

take into account the following other conditions:

a) fault conditions specified in the standard for the type of protection concerned;

b) all operating conditions specified in any other standard specified by him including recognized overloads; any

other operating condition specified by him.

Note 2 to entry: The relevant surface temperature may be internal or external depending upon the type of

protection concerned.

Note 3 to entry: For equipment intended for use in explosive dust atmospheres, the surface temperature is

determined without any deposited dust on the equipment. See EN 13463-1:2009, 6.2.3.

3.9
wheel

circular structure able to rotate on an axle, either directly or with the use of bearing(s), with the external

part in contact with the ground
[SOURCE: ISO 22877:2004, 1.1.1]
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3.10
castor

assembly comprising a housing, one or more wheels, an axle and, if required, accessories

[SOURCE: ISO 22877:2004, 3.1]
3.11
tyre
outer part of a wheel, produced from different material from the wheel centre
[SOURCE: ISO 22877:2004, 1.1.6]
3.12
service brake

brake system allowing the operator to control, directly or indirectly, the speed of the truck or to bring the

truck to a halt

EXAMPLE The brake can be electrical, hydraulic or mechanical or a combination of the three.

[SOURCE: ISO 6292:2008, 3.12, modified: "braking system" replaced with "brake", addition of an example]

3.13
restricted breathing enclosure “nR”
enclosure that is designed to restrict the entry of gases, vapours and mists
[SOURCE: EN 60079-15:2010, 3.7.3]
3.14
safety function

function to be implemented by a safety device, which is intended to achieve or maintain a safe state for the

equipment under control (EUC), in respect of ignition hazards

Note 1 to entry: See EN 50495 for the definitions of “safety device”, “safe state” and “equipment under control”.

[SOURCE: EN 50495:2010, 3.7, modified, addition of Note 1 to entry]
3.15
safety shutdown

shutdown of a truck or a piece of equipment activated by a safety function to prevent potential ignition

sources from becoming effective
3.16
normal operation

situation when the equipment, protective systems, and components are operating for their intended use

within their design parameters
[SOURCE: EN 13463-1:2009, 3.7]
3.17
malfunction

equipment, protective systems and components do not perform the intended function

[SOURCE: EN 13463-1:2009, 3.8]
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3.18
expected malfunction
disturbances or equipment faults which are known to occur in practice
[SOURCE: EN 13463-1:2009, 3.8.1]
3.19
rare malfunction
type of malfunction which may happen only in rare instances
[SOURCE: EN 13463-1:2009, 3.8.2]
3.20
earthing strap

strap made of conductive or dissipative material strong enough to withstand mechanical and chemical

influences and installed to achieve potential equalization between truck chassis and the floor/ground

3.21
controlled stop
condition in which the truck is in a safe stationary state
3.22
highly efficient electrostatic charge generating mechanism

process that generates a higher rate of electrostatic charge than simple operations

Note 1 to entry: For more information, see EN 13463-1:2009, 6.7.3.

EXAMPLE 1 Rubbing, cleaning with a dry cloth, raising from a seat, walking, wiping of clothes are examples of

simple operations.

EXAMPLE 2 The flow of insulating liquids or powders, high voltage spray charging, running of transmission belts

are examples of highly efficient electrostatic charge generating mechanisms.
4 Safety requirements and/or protective measures
4.1 General

Trucks for use in potentially explosive atmospheres shall comply with the additional requirements given in

4.1 up to and including 4.11.

Where the additional hazards specified in normative Annex A could occur, an ignition hazard assessment

in accordance with EN 1127-1 and EN 13463-1 shall be carried out, taking into consideration these

hazards and the additional requirements contained in EN 13463-1 and if relevant supplemented by the

specific parts of EN 13463 for other types of protection.

Trucks of Group II shall be subdivided according to the explosive gas atmosphere for which they are

intended. See EN 60079-0:2012, 4.2.
Group II subdivisions:
a) IIA;
b) IIB;
c) IIB + H
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d) IIB + C H ;
2 2
e) IIB + H + C H .
2 2 2
NOTE 1 Trucks marked IIB are also suitable for IIA applications.

NOTE 2 Trucks marked IIB+H , IIB+C H or IIB+H +C H are also suitable for IIA or IIB applications.

2 2 2 2 2 2

NOTE 3 Trucks equipped with a gas detection system are specifically marked in accordance with 6.3.3 e).

NOTE 4 H is the chemical formula for hydrogen and C H for acetylene.
2 2 2

Trucks of Group III shall be subdivided according to the explosive dust atmosphere for which they are

intended. See EN 60079-0:2012, 4.3.
Group III subdivisions:
f) IIIA: combustible flyings;
g) IIIB: non-conductive dusts;
h) IIIC: conductive dusts.

Equipment shall be selected taking into consideration any service temperatures measured during the

temperature tests described in 5.1.
4.2 Hot surfaces
4.2.1 General

For category 3G and 2G trucks the maximum surface temperature of any part of the truck shall not exceed

the temperature class or maximum surface temperature defined on the truck marking plate.

For category 3D and 2D trucks the maximum surface temperature of any part of the truck which can come

into contact with dust clouds or dust layers shall not exceed the maximum surface temperature defined on

the truck marking plate.
Maximum surface temperatures shall be determined in accordance with 5.1.

Reduction of surface temperatures by means of thermal insulation is not permitted.

NOTE 1 The relationship between the maximum surface temperature of the equipment and the minimum ignition

temperature of dust layers and dust clouds is given in EN 1127-1:2011, 6.4.2 and EN 60079-14, 5.6.3.3.

NOTE 2 The possible insulation effects of a dust layer on the surface temperatures are taken into account by the

safety margin to the minimum ignition temperature of a dust layer specified in EN 1127-1:2011, 6.4. and EN 60079-

14, 5.6.3.3.
4.2.2 Temperature monitoring

Surface temperatures may be limited by the use of a temperature monitoring and control system which

provides a safety shutdown in accordance with 4.3 if limiting values are exceeded.

For both category 3 and category 2 trucks, the electrical temperature monitoring and control system shall

fulfil the performance level PL =c in accordance with E
...

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