BRITISH STANDARD
Non-electrical
equipment for
potentially explosive
atmospheres —
Part 8: Protection by liquid
immersion 'k'
The European Standard EN 13463-8:2003 has the status of a
British Standard
ICS 13.230
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
BS EN
13463-8:2003
BS EN 13463-8:2003
National foreword
This British Standard is the official English language version of
EN 13463-8:2003.
The UK participation in its preparation was entrusted to Technical Committee
FSH/23, Fire precautions in industrial and chemical plant, which has the
responsibility to:
—
aid enquirers to understand the text;
—
present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the
UK interests informed;
—
monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of
British Standards Online.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
This British Standard, was
published under the authority
of the Standards Policy and
Strategy Committee on
15 January 2004
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 15 and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.
Amendments issued since publication
Amd. No.
© BSI 15 January 2004
ISBN 0 580 43251 3
Date
Comments
EUROPEAN STANDARD
EN 13463-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2003
ICS 13.230
English version
Non-electrical equipment for potentially explosive atmospheres Part 8: Protection by liquid immersion 'k'
Appareils non électriques destinés à être utilisés en
atmosphères explosibles - Partie 8: Protection par
immersion dans un liquide 'k'
Nicht-elektrische Geräte für den Einsatz in
explosionsgefährdeten Bereichen - Teil 8: Schutz durch
Flüssigkeitskapselung 'k'
This European Standard was approved by CEN on 1 August 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
© 2003 CEN
All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
B-1050 Brussels
Ref. No. EN 13463-8:2003 E
EN 13463-8:2003 (E)
Contents
page
Foreword......................................................................................................................................................................3
Introduction .................................................................................................................................................................4
1
Scope ..............................................................................................................................................................5
2
Normative references ....................................................................................................................................5
3
Terms and definitions ...................................................................................................................................5
4
Determination of suitability ..........................................................................................................................6
5
Determination of the maximum/minimum criteria......................................................................................6
6
Protective liquid .............................................................................................................................................6
7
Equipment construction ...............................................................................................................................7
8
8.1
8.2
8.3
Type tests and requirements for enclosures..............................................................................................8
General............................................................................................................................................................8
Increased pressure test on enclosed equipment having a sealed enclosure that contains
static, or flowing protective liquid ...............................................................................................................8
Overpressure test on enclosed equipment having a vented enclosure ..................................................8
9
9.1
9.2
Documentation and instructions..................................................................................................................8
General............................................................................................................................................................8
Technical documentation conforming to the requirements of directive 94/9/EC ...................................9
10
Marking ...........................................................................................................................................................9
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other
provisions of EU Directives ........................................................................................................................10
Bibliography ..............................................................................................................................................................15
2
EN 13463-8:2003 (E)
Foreword
This document (EN 13463-8:2003) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive
atmospheres - Explosion prevention and protection”, the secretariat of which is held by DIN.
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 March 2004, and conflicting national standards shall be withdrawn at the latest by
March 2004.
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.
This standard is to specify the requirements for the type of protection "Liquid immersion" for equipment intended for
use in potentially explosive atmospheres and should be used in conjunction with EN 13463-1 " Non-electrical
equipment for potentially explosive atmospheres - Part 1: Basic method and requirements”.
The detailed drafting work was entrusted to Working Group 2 "Equipment for use in potentially explosive
atmospheres".
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
3
EN 13463-8:2003 (E)
Introduction
Certain types of non-electrical equipment, intended for use in potentially explosive atmospheres of gas, vapour
and/or dust, have their potential ignition sources rendered ineffective by either submersing them in a protective
liquid, or by continuously coating them with a flowing film of protective liquid. In some equipment, the protective
liquid is provided solely for the purpose of preventing the potential ignition sources from becoming effective. In
other equipment, the protective liquid serves additional purposes, such as lubricating and/or cooling moving parts,
or as in the case of hydraulic systems, for transmitting energy. In some equipment, the protective liquid may be the
actual process liquid itself.
Examples of the kinds of equipment utilising this type of ignition protection are:
a)
oil immersed disc brakes, for example, on the wheels of vehicles used in potentially explosive atmospheres,
b)
diaphragm and other submersible pumps used for delivering flammable liquids, having their moving
mechanisms immersed below the lowest allowable level of the flammable liquid being processed (e.g.
petroleum product dispensers),
c)
hydraulic pumps and motors having their internal rotating parts continuously immersed in the flowing hydraulic
fluid used to transmit the hydrostatic or hydrokinetic energy,
d)
oil filled gearboxes, having their gear wheels partially immersed, but continuously coated by a viscous film of
lubricating oil. In this example the protective oil coating may be supplied by natural splashing of the wheels as
they rotate in the oil, or by directing a continuously flowing stream of oil directly onto them from an oil pump in
the gearbox sump,
e)
fluid couplings, torque converters, connected for example, between the output shaft of a driving motor and the
input shaft of fully loaded machine, to allow it to be started gradually (‘soft starting’).
In all of the above, ignition protection is achieved by the fact that protective liquid prevents the surrounding
explosive atmosphere from coming into contact with the ignition source(s) by continuously coating, and/or
lubricating and cooling the moving parts.
A similar type of ignition protection, known as oil immersion ”o”, has been used for many years for electrical
equipment, where, in addition to the above, the liquid also acts as an electrical insulating medium. It is for this latter
reason that this standard cannot be applied to electrical equipment, because it allows the use of liquids that
conduct electricity.
4
EN 13463-8:2003 (E)
1
Scope
1.1 This European Standard specifies the requirements for the design, construction, testing and marking of
ignition protected equipment using liquid immersion ‘k’ as a means of preventing potential ignition sources from
becoming effective according to the category, or categories, of the equipment to which it is constructed.
1.2 It may be used to provide ignition protection, either as an independent means, in addition to, or in
combination with, other types of ignition protection listed in EN 13463-1 for Group I, categories M1 and M2 and
Group II, categories 1G, 1D, 2G, 2D, 3G and 3D equipment, according to the ignition hazard assessment.
1.3 This European Standard supplements the requirements of EN 13463-1 insofar as it applies to the protection
of non-electrical equipment by liquid immersion ‘k’.
1.4 This European Standard does not apply to the ignition protection of electrical equipment. For these
requirements reference should be made to EN 50014 and EN 50015, which inter-alia, requires electrically nonconducting protective liquids to be used.
2
Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres Part 1: Basic method and
requirements.
EN 60529, Degree of protection provided by enclosures (IP code) (IEC 60529:1989.)
3
Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 13463-1 and the following apply.
3.1
liquid immersion 'k'
a type of protection in which potential ignition sources are made ineffective or separated from the explosive
atmosphere by either totally immersing them in a protective liquid, or by partially immersing and continuously
coating their active surfaces with a protective liquid in such a way that an explosive atmosphere which may be
above the liquid, or outside the equipment enclosure cannot be ignited.
3.2
protective liquid
a liquid which prevents the explosive atmosphere from making direct contact with potential ignition sources and
thereby ensures it cannot be ignited.
3.3
equipment with a sealed enclosure
totally enclosed equipment that prevents the ingress of an external atmosphere during the expansion and
contraction of the internally contained protective liquid during use in service. Such equipment includes any
pipework associated with it and may contain an over pressure relief device.
3.4
equipment with a vented enclosure
totally enclosed equipment that allows the ingress and egress of an external atmosphere through a breathing
device or constricted opening during the expansion and contraction of the internally contained protective fluid
during normal operation. Such equipment includes any pipework associated with it.
5
EN 13463-8:2003 (E)
3.5
open equipment
equipment that has its components or is itself immersed in a protective liquid that is open to the external
atmosphere. For example, an open top vessel with immersed moving components. Such equipment includes any
pipework associated with it.
4
Determination of suitability
4.1 Before a decision is made to protect equipment or parts of equipment for use as an assembly, including
interconnecting parts, by the measures described in this standard, it shall have been subjected to the ignition
hazard assessment in accordance with 5.2 of EN 13463-1:2001.
4.2 The requirements specified in EN 13463-1 shall be complied with except where specifically excluded by this
standard.
5
Determination of the maximum/minimum criteria
5.1 The manufacturer of the equipment shall determine by calculation and/or by type testing the following
maximum/minimum criteria:

the maximum and minimum level, or if more appropriate, the maximum and minimum pressure or flow of the
protective liquid;

the maximum working angle to the horizontal of the equipment;

the maximum and minimum viscosity of the protective liquid, unless the nature of the protective liquid is
specified by the manufacturer;
required to ensure that the designated potential ignition sources, are either totally immersed, or continuously
coated with sufficient protective liquid, to ensure they cannot become effective. Account shall be taken of the
effects of contraction during starting surges, splashing, turbulence, churning of the liquid, the worst case filling
condition and standstill of the equipment throughout the normal range of operating temperatures.
5.2 Where the ignition protection is achieved by partial immersion and a pumped, or directed flow of liquid
provides the necessary continuous coating on the potential ignition sources, the manufacturer shall determine the
most effective location of any nozzle, spray or coating device to give maximum protection.
5.3 The results of the calculation, or type tests, described above, shall be included in the manufacturer’s
technical documentation; the minimum/maximum criteria shall be given in the operating instructions given to the
user required by EN 13463-1.
6
Protective liquid
The protective liquid used shall be of such viscosity and chemical composition that it:

prevents the potentially explosive atmosphere from coming into direct contact with the potential ignition
source(s) identified in the ignition hazard assessment by providing a continuous coating, or film on the
potential ignition source(s), and
 does not itself produce an explosive atmosphere on any of the potential ignition source(s). This includes voids,
bubbles or mists caused by the churning action of moving parts in service, and/or a chemical reaction between
the protective liquid and the materials used in the equipment’s construction.
NOTE
This does not preclude the use of flammable liquids as to protective liquid.
 does not itself produce an ignition source (e. g. production of deposits prone to self heating).
6
EN 13463-8:2003 (E)
7
Equipment construction
7.1 The equipment shall be constructed to ensure, that the necessary amount of protective liquid is present. If
required by the level of protection, this can be achieved for example by monitoring device(s), indicator(s) or
gauge(s), which are provided on the equipment to indicate the maximum and minimum levels or, if more
appropriate, pressure and flow rate of the protective liquid determined in accordance with 5. Where fitted, these
devices, indicators or gauges shall be so arranged, that they can easily be read by the user.
NOTE
Such devices are not safety devices to prevent ignition. Where such devices are additionally used to protect against
ignition, reference should be made to EN 13463-6.
7.2 Where the ignition protection would be reduced to an unacceptable level if the equipment is used at an angle
to the horizontal, the maximum allowable working angle, or gradient necessary to maintain the required
maximum/minimum criteria, determined according to 5, shall be visible or detectable on the equipment.
7.3 Where contamination, deterioration, or degradation, of the protective liquid by external means can reduce the
level of the ignition protection below that commensurate with the equipment category, constructional measures
shall be incorporated and/or maintenance instructions provided by the manufacturer, to ensure that the liquid
continues to maintain the requisite level of ignition protection throughout its intended life.
NOTE
This may be achieved, for example by:
a)
in the case of equipment with continuously flowing protective liquids, providing filtration to prevent solid contaminants being
carried into moving parts;
b)
in the case of open equipment, selecting a protective liquid that is not adversely affected by atmospheric contamination,
such as atmospheric moisture and dust;
c)
in the case of equipment needing protection against high levels of atmospheric dust and water vapour, providing a degree
of ingress protection for the enclosure of at least IP 66 as described in EN 60529;
d)
in the case of equipment with a sealed enclosure, providing an over pressure relief device having an IP rating of at least IP
23 according to EN 60529 and set by the manufacturer of the liquid filled equipment to operate at least at 1,1 times the
absolute pressure above the liquid level and a minimum of 0,1 bar above the normal operating pressure;
e)
In the case of equipment having a vented enclosure, constructing it so that any gas or vapour which may evolve from the
protective liquid in normal service can readily escape through a breathing device having an IP rating of at least IP 23
according to EN 60529 and incorporating a suitable drying agent if necessary;
f)
In the case where manufacturers instructions are used, requiring the liquid to be subjected to routine condition monitoring
and specifying the maximum allowable periods between checks for contaminants such as deposits in the liquid and
degradation, for example, by chemical changes to the liquid’s composition such as abnormal change in acidity, or water
content.
7.4 Means shall be provided to guard against accidental loosening of external and internal fasteners associated
with covers giving access to the protective liquid. This also applies to any devices needed to indicate the level of
the protective liquid and plugs and other parts for filling or draining the protective liquid which could result in
unacceptable reduction in the ignition protection if it they were not maintained in leak proof condition.
Examples of the means to guard against accidental loosening are:
a)
cementing of threads;
b)
locking washers;
c)
wiring of bolt heads.
7.5 Monitoring device(s), indicator(s), or gauge(s) shall be so designed and constructed that they indicate the
actual level.
7.6 Indicating devices shall be constructed, situated and protected in such a manner that they shall not leak and
cannot be damaged in normaloperation.
7
EN 13463-8:2003 (E)
7.7 A dipstick may be used to check the level of the protective liquid in normal service the dipstick shall be
secured in its measurement position so that any requirements for ingress protection or sealing are maintained. An
adjacent label shall be provided, requiring the dipstick to be replaced after use.
7.8 Where necessary, the possibility of the protective liquid being lost by capillary or siphon action shall be
prevented.
7.9 For open equipment, or equipment with a vented enclosure, the maximum temperature of any surface of the
protective liquid exposed to the potentially explosive atmosphere shall not exceed the maximum surface
temperature of the equipment according to its classification in EN 13463-1.
8
8.1
Type tests and requirements for enclosures
General
When tested in accordance with 8.2 and 8.3 no damage, deformation or loss of liquid shall occur to the equipment,
which would cause the liquid level to fall below the minimum criteria determined in 5.
The following tests shall be performed without the equipment working.
8.2 Increased pressure test on enclosed equipment having a sealed enclosure that contains
static, or flowing protective liquid
The enclosure shall be submitted to an internal pressure, equal to 1,5 times the maximum normal working gauge
pressure and at least 0,5 bar overpressure for a minimum period of 60 s, with the enclosure filled to the specified
maximum liquid level.
8.3
Overpressure test on enclosed equipment having a vented enclosure
The enclosure shall be submitted to an internal pressure equal to 1,2 times the maximum normal working gauge
pressure and at least 0,2 bar overpressure for a minimum period of 60 s with the enclosure filled with the protective
liquid to the specified maximum liquid level.
9
9.1
Documentation and instructions
General
Equipment conforming to the requirements of this standard shall be accompanied by the user instructions, the
particulars required by EN 13463-1 and additionally:
a)
details of the maximum and minimum level of the protective liquid, or if more appropriate, the maximum and
minimum pressure and flow rate of protective liquid;
b)
details of the maximum normal working pressure;
c)
details of the maximum allowable working angle to the horizontal of the equipment;
d)
details of the type of liquid to be used, or its minimum viscosity;
e)
if necessary, any specific mounting instruction for the equipment;
f)
instructions relating to maintenance, recommended duty life, replacement, replenishment and disposal of the
protective liquid;
g)
where applicable instructions regarding the periodic internal cleaning to remove deposits that could self heat;
h)
instructions about the commissioning, initial filling, and putting into service of the equipment.
8
EN 13463-8:2003 (E)
9.2
Technical documentation conforming to the requirements of directive 94/9/EC
Technical documentation to demonstrate conformity to directive 94/9/EC shall contain the user instructions, the
particulars required by EN 13463-1 and additionally the following information:
a)
object and use purpose;
b)
desired type of protection, temperature class and relevant standards;
c)
type label with explanation;
d)
function;
e)
variants;
f)
main drawing - total view - sections drawing -additional documentation;
g)
results of any calculations;
h)
requirements of routine testing;
i)
copy of the test reports indicating compliance with type test(s) described in 8;
j)
max. temperature - where appropriate a copy of the temperature test report;
k)
a copy of the document testifying compliance with the declared IP rating;
10 Marking
10.1 In addition to the marking requirements of EN 13463-1, the specific marking necessary for compliance with
this standard shall include the symbol 'k' (designating the type of explosion protection).
10.2 Example of the marking in relation to the explosion protection for Group II, Category 2 equipment, intended
for use in a potentially explosive atmosphere of gas:
10.3 Example of the marking in relation to the explosion protection for Group I, Category M 2 equipment:
II 2 G k T4
I M2 k
9
EN 13463-8:2003 (E)
Annex ZA
(informative)
Clauses of this European Standard addressing essential requirements or
other provisions of EU Directives
This European standard 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 94/9/EC of 23 March 1993
concerning equipment and protective systems intended for use in potentially explosive atmospheres.
WARNING: other requirements and other directives may be applicable to the equipment falling within the
scope of this standard.
The clauses of this standard are likely to support requirements of the directive 94/9/EC.
Compliance with the clauses of this standard provides one means of conforming with the specific essential
requirements (ESR) of the directive 94/9/EC and associated EFTA regulations
The following check list gives the correspondence between the ESR and the relevant clauses of this standard.
Table ZA.1
Essential Safety Requirement
Reference in this standard
1
Common Requirements
1.0.1
Principles of integrated explosion
safety
Clause 4 (ignition hazard
assessment)
1.0.2
Design considerations, take account
of faults/misuse
Clause 4 (ignition hazard
assessment)
Clause 7 (Construction);
Clause 8 (type tests)
1.0.3
Special checking and maintenance
conditions
7.3
1.0.4
Foreseeable area conditions
Clause 4 (ignition hazard
assessment)
1.0.5
Marking
Clause 10 (Marking)
1.0.6
Manufacturer’s instructions
Clause 9
1.1
Selection of materials
1.1.1
Must not trigger an explosion
Clause 4 (ignition hazard
assessment)
1.1.2
Limits of operation
Clause 5 (Determination of
max/min criteria)
1.1.3
Effects on predictable changes in
materials characteristics
Clause 8 (type tests)
10
Reference in other
standards
EN 13463-8:2003 (E)
Table ZA.1 (continued)
Essential Safety Requirement
Reference in this standard
Reference in other
standards
1.2
Design and construction
1.2.1
State of the art design of explosion
protection
Clauses 4,5,6,7
1.2.2
Safe functioning of replacement
components
7.3
1.2.3
Enclosed structures and prevention
of leaks
7.4
1.2.4
safety with dust deposits
Clause 7 (Construction & IP
rating).
1.2.5
Additional means of protection for
external stresses
Clause 8 (type tests)
1.2.6
Safe opening
1.2.7
Other hazards
a)
Electrical dangers,
b)
Surface temperatures
EN 13463-1:2001, 7.11
c)
Non-electrical dangers
EN 13463-1
1.2.8
Overloading of equipment, control
devices, power limitation.
Overloading is not
specifically dealt with.
1.2.9
Flameproof enclosure systems
Not applicable to the type of
protection covered by this
standard
1.3
Prevention of potential ignition sources
1.3.1
Hazards arising from hot surfaces
and mechanical sparks.
1.3.2
Hazards arising from static electricity
1.3.3
Hazards arising from stray electric
and leakage currents
1.3.4
Hazards arising from overheating
1.3.5
Hazards arising from pressure
compensation operations or shock
waves.
EN 13463-1
drop tests),
(impact
and
EN 13463-1
The danger of skin burns and electric shock are not dealt
with in the explosion protection standards.
Clauses 4,5,6,7
EN 13463-1(ignition hazard
assessment)
EN 13463-1
Not dealt with in the non-electrical standards except for
requirement to provide an earth bonding connection.
EN 13463-1
Not relevant to this type of ignition protection
1.4
Hazards rising from external effects
1.4.1
Safe functioning
Pollutants are dealt with in
clause 7 (IP rating)
1.4.2
Mechanical and thermal stresses and
withstanding attack by existing or on
foreseeable aggressive substances
Clause 7 (Construction)
Clause 8 (type tests).
11
EN 13463-8:2003 (E)
Table ZA.1 (continued)
Essential Safety Requirement
Reference in this standard
Reference in other
standards
1.5
Requirements in respect of safety-related devices
1.5.1 to
1.5.8
In this standard some monitoring devices are required but they are not the primary means of
ignition protection and are not required to meet any specific reliability or functional failure rate
criteria.
1.6
Integration of safety requirements relating to the system
1.6.1 to
1.6.5
Integrated systems are not intended to be within the scope of this standard
2.0
Supplementary requirements in respect of equipment
2.0.1
Requirements for Group I category M1 Equipment
2.0.1.1
Source of ignition not to become
active
2.0.1.3
This standard is relevant if
Liquid immersion forms one
of the two means required
for M1 equipment.
Group I (Mining) Category
M1 equipment is dealt with
in EN 50303
Surface temperature to be below
ignition temperature to prevent the
ignition of suspend dust
As above
As above
2.0.1.4
Avoidance of opening of equipment
with sources of ignition
As above
As above
2.0.2
Requirements for Group I category M 2 equipment
2.0.2.1
Sources of ignition not to become
active in normal operation
Clause 4 (ignition hazard
assessment)
2.0.2.2
Opening of equipment only under
non-active conditions
Not covered
2.0.2.3
Requirement for explosion hazards
from dust category M1
Clause 7 (Construction & IP
rating)
2.1
Requirements for Group II category 1 equipment
2.1.1
Explosive atmospheres caused by
gases, vapours or hazes
This standard is relevant if
Liquid immersion forms one
of the two means required
for category 1 equipment.
Group II Category 1
equipment is dealt with in
EN 13463-1
2.1.1.1
Sources of ignition not to become
active in normal operation
Clause 4 (ignition hazard
assessment).
See 2.1.1 above.
2.1.1.2
Surface temperatures not exceeded
Clause 4 (ignition hazard
assessment).
See 2.1.1 above
2.1.1.3
Opening of equipment only under
non-active conditions
Clause 4 (ignition hazard
assessment).
See 2.1.1 above
2.1.2
Surface temperatures to be kept
below ignition temperatures of
suspended dust
Clause 4 (ignition hazard
assessment).
See 2.1.1 above
2.1.2.4
Opening of equipment only under
non-active conditions
Clause 4 (ignition hazard
assessment).
See 2.1.1 above
12
EN 13463-8:2003 (E)
Table ZA.1 (continued)
Essential Safety Requirement
Reference in this standard
2.2
Requirements for Group II category 2 equipment
2.2.1
Explosive atmospheres caused by
gases, vapours or mists
Clause 4 (ignition hazard
assessment).
2.2.1.1.
Design and construction of
equipment to prevent ignition sources
arising
Clause 4 (ignition hazard
assessment
2.2.1.2
Design and construction of
equipment so that surface
temperatures is not exceeded
Clause 4 (ignition hazard
assessment).
2.2.1.3
Design of equipment for operating
under non-active conditions and/ or
interlocking systems
Not covered
2.2.2.1
Design and protection of equipment
to prevent sources of dust ignition
becoming active
Clause 4 (ignition hazard
assessment)
2.2.2.2
Stated max. surface temperatures
not to be exceeded, no dust
penetration
Clause 7 (Construction & IP
rating).
2.3
Requirements for Group II category 3 equipment
2.3.1.1
Design and construction of
equipment to prevent foreseeable
ignition of gas or mist during normal
operation
Equipment constructed in
accordance with this
standard will prevent
ignition by virtue of the fact
that an explosive
atmosphere of gas or mist
will not make direct contact
with the potential ignition
sources
2.3.1.2
Surface temperatures not to exceed
stated figures
7.11
2.3.1.3
Explosive atmospheres caused by air/dust mixtures
2.3.2.3
Reference in other
standards
Clause 7 (Construction).
Clause 7 (Construction)
Design and construction of
equipment to prevent ignition of
air/dust mixtures during normal
operation
Equipment constructed in
accordance with this
standard will prevent
ignition by virtue of the fact
that an explosive
atmosphere of dust will not
occur inside the liquid filled
enclosure during normal
working.
Prevention of dust particles mixing
with air in equipment to cause
ignition inside the equipment .
Clause 7 (Construction & IP
rating).
EN 13463-1 (temperature
limitation)
13
EN 13463-8:2003 (E)
Table ZA.1 (continued)
Essential Safety Requirement
3
Reference in this standard
Reference in other
standards
Requirements for 'Protective Systems'
Protective systems are not within the scope of this ignition protection standard.
14
EN 13463-8:2003 (E)
Bibliography
EN 50014, Electrical apparatus for potentially explosive atmospheres – General requirements.
EN 50015, Electrical apparatus for potentially explosive atmospheres – Oil immersion "o''.
15
BS EN
13463-8:2003
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