FprEN 1755

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

This document applies to self-propelled and pedestrian propelled manual and semi-manual industrial trucks as defined in ISO 5053-1:2020 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 document 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 document is not applicable to:
-   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 document 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.
Technical requirements relating to lithium-ion batteries and fuel cells as energy sources are not given in this document due to their specific hazards.

Flurförderzeuge - Sicherheitsanforderungen und Verifizierung - Zusätzliche Anforderungen für den Einsatz in explosionsgefährdeten Bereichen

Dieses Dokument gilt für motorkraftbetriebene und mitgängerbetriebene, manuelle und halbmanuelle Flurförderzeuge, wie in ISO 5053-1:2020 festgelegt, einschließlich deren Lastaufnahmemittel und 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.
Dieses Dokument legt ergänzende technische Anforderungen zur Verhinderung der Zündung einer explosionsfähigen Atmosphäre aus brennbaren Gasen, Dämpfen, Nebeln oder Stäuben durch Flurförderzeuge der Gerätegruppe II und Gerätekategorie 2G, 3G, 2D oder 3D fest.
ANMERKUNG 2   Der Zusammenhang zwischen einer Gerätekategorie (im Folgenden als Kategorie bezeichnet) und der zugehörigen Zone (Einteilung von explosionsgefährdeten Bereichen) ist im informativen Anhang B dargestellt.
Dieses Dokument ist nicht anwendbar auf:
-   Flurförderzeuge der Gerätegruppe I;
-   Flurförderzeuge der Gerätegruppe II, Gerätekategorie 1;
-   Flurförderzeuge, die zur Anwendung in explosionsgefährdeten Bereichen mit hybriden Gemischen vorgesehen sind;
-   Schutzsysteme.
Dieses Dokument 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.
Die technischen Anforderungen im Zusammenhang mit Lithium-Ionen-Batterien und Brennstoffzellen als Energiequellen sind aufgrund ihrer spezifischen Gefährdungen nicht in diesem Dokument angegeben.

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

Le présent document s’applique aux chariots automoteurs et aux chariots à conducteur à propulsion manuelle et semi-manuelle, tels que définis dans l’ISO 5053-1:2020, 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.
Le présent document 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 (informative).
Le présent document n'est pas applicable :
-   aux chariots du groupe d’appareil I ;
-   aux chariots du groupe d’appareil II, catégorie d’appareil 1 ;
-   aux chariots destinés à être utilisés en atmosphères explosibles constituées de mélanges hybrides ;
-   aux systèmes de protection.
Le présent document ne s’applique pas 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.
Les prescription techniques relatives aux batteries lithium-ion et aux piles à combustibles en tant que sources d’énergie ne sont pas données dans le présent document en raison de leurs phénomènes dangereux spécifiques.

Vozila za talni transport - Varnostne zahteve in preverjanje - Dodatne zahteve za delovanje v potencialno eksplozivnih atmosferah

General Information

• Status: Not Published
• ICS: 53.060 - Industrial trucks
• Technical Committee: CEN/TC 150 - Industrial trucks - Safety
• Drafting Committee: CEN/TC 150/WG 13 - Potentially explosives atmospheres
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 15-Sep-2022
• Completion Date: 05-Sep-2022
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Mandate: M/BC/CEN/92/46 - Standardization mandate assigned to CEN/CENELEC concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: oSIST prEN 1755:2022 - Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres

Relations

• Revises: EN 1755:2015 - Industrial Trucks - Safety requirements and verification - Supplementary requirements for operation in potentially explosive atmospheres
• Effective Date: 09-Dec-2020

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 1755:2022
01-januar-2022

Vozila za talni transport - Varnostne zahteve in preverjanje - Dodatne zahteve za

delovanje v potencialno eksplozivnih atmosferah

Industrial Trucks - Safety requirements and verification - Supplementary requirements for

operation in potentially explosive atmospheres
Flurförderzeuge - Sicherheitsanforderungen und Verifizierung - Zusätzliche
Anforderungen für den Einsatz in explosionsgefährdeten Bereichen

Chariots de manutention - Prescriptions de sécurité et vérification - Prescriptions

supplémentaires pour le fonctionnement en atmosphères explosibles
Ta slovenski standard je istoveten z: prEN 1755
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
53.060 Industrijski tovornjaki Industrial trucks
oSIST prEN 1755:2022 en,fr,de

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

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oSIST prEN 1755:2022
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oSIST prEN 1755:2022
DRAFT
EUROPEAN STANDARD
prEN 1755
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2021
ICS 53.060 Will supersede EN 1755:2015
English Version
Industrial Trucks - Safety requirements and verification -
Supplementary requirements for operation in potentially
explosive atmospheres

Chariots de manutention - Prescriptions de sécurité et Flurförderzeuge - Sicherheitsanforderungen und

vérification - Prescriptions supplémentaires pour le Verifizierung - Zusätzliche Anforderungen für den

fonctionnement en atmosphères explosibles Einsatz in explosionsgefährdeten Bereichen

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

CEN/TC 150.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1755:2021 E

worldwide for CEN national Members.
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oSIST prEN 1755:2022
prEN 1755:2021 (E)
Contents Page

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

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

1 Scope .......................................................................................................................................................... 7

2 Normative references .......................................................................................................................... 7

3 Terms and definitions ....................................................................................................................... 10

4 Safety requirements and/or protective measures ................................................................. 13

4.1 General.................................................................................................................................................... 13

4.2 Hot surfaces .......................................................................................................................................... 14

4.2.1 General.................................................................................................................................................... 14

4.2.2 Temperature monitoring ................................................................................................................. 14

4.2.3 Temperature classification ............................................................................................................. 15

4.3 Safety shutdown .................................................................................................................................. 15

4.4 Mechanically generated sparks ..................................................................................................... 16

4.4.1 Load handling devices ....................................................................................................................... 16

4.4.2 Fans of electrical equipment........................................................................................................... 16

4.4.3 Radiator fans on IC-engines ............................................................................................................ 16

4.4.4 Other fans .............................................................................................................................................. 16

4.4.5 Other rotating parts ........................................................................................................................... 17

4.5 Electrical system ................................................................................................................................. 17

4.5.1 General.................................................................................................................................................... 17

4.5.2 Electrical equipment.......................................................................................................................... 18

4.5.3 Electrical system bipolarity ............................................................................................................ 19

4.5.4 Insulation monitoring ....................................................................................................................... 20

4.5.5 Battery and battery connectors ..................................................................................................... 20

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

detection systems ............................................................................................................................... 20

4.6.1 General.................................................................................................................................................... 20

4.6.2 Gas detection systems ....................................................................................................................... 21

4.6.3 Gas sensors ............................................................................................................................................ 22

4.6.4 Restricted breathing enclosures “nR” in combination with a gas detection system .. 23

4.7 Internal combustion engines .......................................................................................................... 23

4.8 Electrostatic risks ............................................................................................................................... 23

4.8.1 Bonding .................................................................................................................................................. 23

4.8.2 Circuit resistance ................................................................................................................................ 24

4.8.3 Non-conductive parts ........................................................................................................................ 24

4.8.4 Transmission belts ............................................................................................................................. 25

4.8.5 Hydraulic systems .............................................................................................................................. 26

4.8.6 Castors and wheels ............................................................................................................................. 26

4.9 Requirements for brakes, clutches and couplings .................................................................. 27

4.9.1 General.................................................................................................................................................... 27

4.9.2 Mechanical clutches and couplings .............................................................................................. 27

4.9.3 Hydrokinetic clutches ....................................................................................................................... 27

4.9.4 Service brakes and friction clutches for category 3G and 3D trucks ............................... 28

4.9.5 Service brakes and friction clutches for category 2G trucks ............................................... 28

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4.9.6 Service brakes and friction clutches for category 2D trucks .............................................. 29

4.9.7 Parking brakes .................................................................................................................................... 29

4.9.8 Emergency stop brake ...................................................................................................................... 29

4.10 Requirements for pneumatic systems ........................................................................................ 29

4.11 Flammability of non-metallic materials ..................................................................................... 29

5 Verification of safety requirements and/or protective measures .................................... 30

5.1 Determination of the maximum surface temperatures ........................................................ 30

5.1.1 General ................................................................................................................................................... 30

5.1.2 Test conditions .................................................................................................................................... 30

5.1.3 Test procedures .................................................................................................................................. 30

5.1.4 Measurements ..................................................................................................................................... 33

5.2 Measurement of circuit resistance and capacitance .............................................................. 34

5.2.1 Verification and tests of circuit resistance and bonding resistance ................................ 34

5.2.2 Measurement of capacitance of insulated metal parts ......................................................... 35

6 Information for use ............................................................................................................................ 35

6.1 General ................................................................................................................................................... 35

6.2 Instruction handbook ....................................................................................................................... 35

6.2.1 Operation of the truck....................................................................................................................... 35

6.2.2 Service and maintenance of the truck ......................................................................................... 35

6.2.3 Additional safety information ........................................................................................................ 37

6.2.4 Information for charging of the battery and battery handling .......................................... 37

6.3 Marking .................................................................................................................................................. 38

6.3.1 General ................................................................................................................................................... 38

6.3.2 Minimum marking .............................................................................................................................. 38

6.3.3 Additional marking according to this document (Ex - marking)....................................... 38

6.4 Warning labels ..................................................................................................................................... 39

Annex A (normative) List of significant hazards .................................................................................. 40

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

................................................................................................................................................................... 41

Annex C (informative) Typical example of cladding of load handling devices .......................... 42

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

4.8.3.1 ...................................................................................................................................................... 44

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

ISO 9563:2015 or ISO 1813:2014 ................................................................................................. 47

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

previous edition of this European Standard ............................................................................. 48

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

combination with gas detection system ..................................................................................... 50

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

Requirements of EU Directive 2014/34/EU aimed to be covered .................................... 51

Bibliography ....................................................................................................................................................... 54

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oSIST prEN 1755:2022
prEN 1755:2021 (E)
European foreword

This document (prEN 1755:2021) has been prepared by Technical Committee CEN/TC 150 “Industrial

Trucks - Safety”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1755:2015.

In comparison with the previous edition, the following technical modifications have been made:

• Inclusion of requirements for driverless trucks;

• Requirements of EN 1175:2020 have been assessed and clarified where appropriate;

• Removal of requirement b) for brake materials as does not represent state of the art in brake material

technology;
• Normative standard references updated.

This document has been prepared under a Standardization Request given to CEN by the European

Commission and the European Free Trade Association, and supports essential requirements of EU

Directive(s) / Regulation(s).

For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part

of this document.
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oSIST prEN 1755:2022
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Introduction
This document is a type-C standard as stated in EN ISO 12100:2010.

This document is of relevance, in particular, for the following stakeholder groups representing the market

players with regard to machinery safety:
• machine manufacturers (small, medium and large enterprises);

• health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).

Others can be affected by the level of machinery safety achieved with the means of the document by the

above-mentioned stakeholder groups:
• machine users/employers (small, medium and large enterprises);

• machine users/employees (e.g. trade unions, organizations for people with special needs);

• service providers, e.g. for maintenance (small, medium and large enterprises);
• consumers (in case of machinery intended for use by consumers).

The above-mentioned stakeholder groups have been given the possibility to participate at the drafting

process of this document.

The machines 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 type 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.

This document covers specific safety requirements where industrial trucks will operate in potentially

explosive atmospheres that are not covered exhaustively by:
• EN 1459-1:2017+A1:2020 and EN 1459-2:2015+A1:2018;
• ISO 24134:2006;
• EN ISO 3691-1:2015 ;
• EN ISO 3691-2:2016;
• EN ISO 3691-3:2016;
• EN ISO 3691-4:2020;
• EN ISO 3691-5:2015
• EN ISO 3691-6:2015.
As impacted by EN ISO 3691-5:2015/A1:2020.
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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

needs to identify the hazards that apply to their product and carry out a risk assessment. The

manufacturer then needs 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 can also arise

from foreseeable abnormal situations.

In selecting the most appropriate methods, the manufacturer needs 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 need to draw the user's attention to ways

shown by experience in which the machinery ought not to be used.

This document 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. Refer to ISO 12100:2010.
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1 Scope

This document applies to self-propelled and pedestrian propelled manual and semi-manual industrial

trucks as defined in ISO 5053-1:2020 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 document 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 document is not applicable to:
• 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 document 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 properties of

2 2 4
these gases.

Technical requirements relating to lithium-ion batteries and fuel cells as energy sources are not given in

this document due to their specific hazards.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1127-1:2019, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and

methodology

EN 1149-5:2018, Protective clothing - Electrostatic properties - Part 5: Material performance and design

requirements
EN 1175:2020, Safety of industrial trucks - Electrical/electronic requirements

EN 1459-1:2017+A1:2020, Rough-terrain trucks - Safety requirements and verification - Part 1: Variable-

reach trucks

EN 1459-2:2015+A1:2018, Rough-terrain trucks - Safety requirements and verification - Part 2: Slewing

variable-reach 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
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EN 1834-3:2000, 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 14986:2017, Design of fans working in potentially explosive atmospheres

EN 50271:2018, 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 60079-7:2015, Explosive atmospheres - Part 7: Equipment protection by increased safety “e”

(IEC 60079-7:2015)

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

(IEC 60079-14:2014)

EN 60079-17:2014, Explosive atmospheres - Part 17: Electrical installations inspection and maintenance

(IEC 60079-17:2013)

EN 60079-29-1:2016, Explosive atmospheres - Part 29-1: Gas detectors - Performance requirements of

detectors for flammable gases (IEC 60079-29-1:2016)

EN 60079-29-2:2015, Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and

maintenance of detectors for flammable gases and oxygen (IEC 60079-29-2:2015)

EN 60079-29-3:2014, Explosive atmospheres - Part 29-3: Gas detectors - Guidance on functional safety of

fixed gas detection systems (IEC 60079-29-3:2014)

EN 60079-31:2014, Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"

(IEC 60079-31:2013)

EN 60384-14:2013, Fixed capacitors for use in electronic equipment - Part 14: Sectional specification -

Fixed capacitors for electromagnetic interference suppression and connection to the supply mains

(IEC 60384-14:2013)

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

EN 60695-11-10:2013, Fire hazard testing - Part 11-10: Test flames - 50 W horizontal and vertical flame

test methods (IEC 60695-11-10:2013)

EN 61508-1:2010, Functional safety of electrical/electronic/programmable electronic safety-related

systems - Part 1: General requirements (IEC 61508-1:2010)

EN 61508-6:2010, 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 61508-6:2010)

As impacted by EN 60079-7:2015/A1:2018.
As impacted by EN 60384-14:2013/A1:2016.
As impacted by EN 60529:1991/A1:2000 and EN 60529:1991/A2:2013.
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EN IEC 60079-0:2018, Explosive atmospheres - Part 0: Equipment - General requirements

(IEC 60079-0:2017)

EN IEC 60079-15:2019, Explosive atmospheres - Part 15: Equipment protection by type of protection "n"

(IEC 60079-15:2017)

EN ISO 284:2012, Conveyor belts - Electrical conductivity - Specification and test method (ISO 284:2012)

EN ISO 3691-1:2015, 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 3691-4:2020, Industrial trucks - Safety requirements and verification - Part 4: Driverless industrial

trucks and their systems (ISO 3691-4:2020)

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

principles for design (ISO 13849-1:2015)

EN ISO 20344:2011, Personal protective equipment - Test methods for footwear (ISO 20344:2011)

EN ISO 80079-36:2016, Explosive atmospheres - Part 36: Non-electrical equipment for explosive

atmospheres - Basic method and requirements (ISO 80079-36:2016)

EN ISO 80079-37:2016, Explosive atmospheres - Part 37: Non-electrical equipment for explosive

atmospheres - Non-electrical type of protection constructional safety ''c'', control of ignition sources ''b'',

liquid immersion ''k'' (ISO 80079-37:2016)

CLC/TR 60079-32-1:2018, Explosive atmospheres - Part 32-1: Electrostatic hazards, guidance

IEC/TS 60079-46:2017, Explosive atmospheres - Part 46: Equipment assemblies

ISO 1813:2014, 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 9563:2015, Belt drives — Electrical conductivity of antistatic endless synchronous belts —

Characteristics and test method

ISO 15870:2000, Powered industrial trucks — Safety signs and hazard pictorials — General principles

As impacted by EN ISO 3691-1:2015/A1:2020
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
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]
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]
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