Electrical apparatus for use in the presence of combustible dust - Part 18: Protection by encapsulation "mD"

Applicable to electrical apparatus protected by encapsulation type of protection mD and surface temperature limitation for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion hazard. Specifies requirements for design, construction and testing of electrical apparatus, parts of electrical apparatus and Ex components where the rated voltage does not exceed 10 kV. The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires additional protective measures.

Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub - Teil 1: Schutz durch Vergusskapselung "mD"

Matériels électriques pour utilisation en présence de poussières combustibles - Partie 18: Protection par encapsulage "mD"

S'applique aux matériels électriques protégés par encapsulage de type mD et par limitation de la température de surface en vue d'une utilisation dans des zones de présence de poussière combustible en quantités pouvant entraîner des risques d'incendie ou d'explosion. Spécifie les exigences de conception, de construction et d'essais du matériel électrique, des pièces du matériel électrique et des composants Ex pour lesquels la tension assignée ne dépasse pas 10 kV. L'utilisation du matériel électrique dans des atmosphères qui peuvent contenir du gaz explosif et de la poussière combustible soit simultanément soit séparément requiert des mesures de protection supplémentaires.

Električne naprave za uporabo v prisotnosti gorljivega prahu - 18. del: Zaščita zalivanje z zalivno maso "mD" (IEC 61241-18:2004)

General Information

Status
Withdrawn
Publication Date
09-Nov-2004
Withdrawal Date
30-Sep-2007
Current Stage
9960 - Withdrawal effective - Withdrawal
Start Date
01-Oct-2012
Completion Date
01-Oct-2012

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SLOVENSKI SIST EN 61241-18:2005

STANDARD
april 2005
Električne naprave za uporabo v prisotnosti gorljivega prahu - 18. del: Zaščita
zalivanje z zalivno maso "mD" (IEC 61241-18:2004)
Electrical apparatus for use in the presence of combustible dust – Part 18:
Protection by encapsulation "mD"
ICS 29.260.20 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 61241-18
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2004

ICS 29.260.20
English version
Electrical apparatus for use in the presence of combustible dust
Part 18: Protection by encapsulation "mD"
(IEC 61241-18:2004)
Matériels électriques pour utilisation en Elektrische Betriebsmittel zur Verwendung
présence de poussières combustibles in Bereichen mit brennbarem Staub
Partie 18: Protection par encapsulage Teil 1: Schutz durch Vergusskapselung
"mD" "mD"
(CEI 61241-18:2004) (IEC 61241-18:2004)

This European Standard was approved by CENELEC on 2004-10-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61241-18:2004 E
Foreword
The text of document 31H/176/FDIS, future edition 1 of IEC 61241-18, prepared by SC 31H,
Apparatus for use in the presence of combustible dust, of IEC TC 31, Electrical apparatus for
explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61241-18 on 2004-10-01.
*)
This standard is to be used in conjunction with EN 61241-0 .
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-10-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive(s). See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61241-18:2004 was approved by CENELEC as a European
Standard without any modification.
__________
*)
In preparation.
- 3 - EN 61241-18:2004
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60079-7 2001 Electrical apparatus for explosive gas EN 60079-7 2003
atmospheres
Part 7: Increased safety "e"
IEC 60079-11 1999 Part 11: Intrinsic safety "i" - -

1) 2)
IEC 60086-1 - Primary batteries EN 60086-1 2001
Part 1: General
IEC 60127 Series Miniature fuses EN 60127 Series

1) 2)
IEC 60243-1 - Electrical strength of insulating materials - EN 60243-1 1998
Test methods
Part 1: Tests at power frequencies

3)
IEC 60285 1993 Alkaline secondary cells and batteries - EN 60285 1994
Sealed nickel-cadmium cylindrical
rechargeable single cells
1) 2)
IEC 60622 - Secondary cells and batteries containing EN 60622 2003
alkaline or other non-acid electrolytes -
Sealed nickel-cadmium prismatic
rechargeable single cells
IEC 60664-1 1992 Insulation coordination for equipment
within low-voltage systems
Part 1: Principles, requirements and tests
+ A1 2000
+ A2 2002 EN 60664-1 2003
1) 2)
IEC 60691 - Thermal-links - Requirements and EN 60691 2003
application guide
1) 2)
IEC 61150 - Alkaline secondary cells and batteries - EN 61150 1993
Sealed nickel-cadmium rechargeable
monobloc batteries in button cell design

1)
Undated reference.
2)
Valid edition at date of issue.
3)
EN 60285 is superseded by EN 61951-1:2003 which is based on IEC 61951-1:2003.

Publication Year Title EN/HD Year
1)
IEC 61241-0 - Electrical apparatus for use in the - -
presence of combustible dust
Part 0: General requirements
1) 2)
IEC 61241-1 - Electrical apparatus for use in the EN 61241-1 2004
presence of combustible dust
Part 1: Protection by enclosures "tD"

4)
IEC 61241-11 - Part 11: Intrinsically safe apparatus 'iD' - -

5)
IEC 61436 1998 Secondary cells and batteries containing EN 61436 1998
alkaline or other non-acid electrolytes -
Sealed nickel-metal hydride rechargeable
single cells
1) 2)
IEC 61558-2-6 - Safety of power transformers, power EN 61558-2-6 1997
supply units and similar
Part 2-6: Particular requirements for
safety isolating transformers for general
use
1) 2)
IEC 61960-1 - Secondary lithium cells and batteries for EN 61960-1 2001
portable applications
Part 1: Secondary lithium cells

1) 2)
IEC 62326-4-1 - Printed boards EN 62326-4-1 1997
Part 4: Rigid multilayer printed boards
with interlayer connections - Sectional
specification -- Section 1: Capability
Detail Specification - Performance levels
A, B and C
ISO 62 1999 Plastics - Determination of water EN ISO 62 1999
absorption
ANSI/UL 248-1 1995 Standard for low-voltage fuses - -
Part 1: General requirements
ANSI/UL 746B 2000 Polymeric Materials - Long-Term Property - -
Evaluations
4)
To be published.
5)
EN 61436 is superseded to EN 61951-2:2000, which is based on IEC 61951-2:2003.

- 5 - EN 61241-18:2004
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Annex II of the EC Directive 94/9/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive[s] concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling
within the scope of this standard.

NORME CEI
INTERNATIONALE IEC
61241-18
INTERNATIONAL
Première édition
STANDARD
First edition
2004-08
Matériels électriques pour utilisation
en présence de poussières combustibles –
Partie 18:
Protection par encapsulage «mD»
Electrical apparatus for use in the
presence of combustible dust –
Part 18:
Protection by encapsulation "mD"
Numéro de référence
Reference number
CEI/IEC 61241-18:2004
61241-18” IEC:2004 – 3 –
CONTENTS
FOREWORD .7
INTRODUCTION .13
1 Scope .17
2 Normative references .17
3 Terms and definitions .21
4 General.23
4.1 Temperature classification.23
4.2 Level of protection.23
4.3 Level of protection "maD" .23
4.4 Level of protection "mbD" .23
4.5 Supply specifications.25
5 Requirements for compounds .25
5.1 General .25
5.2 Specification .25
6 Temperatures.25
6.1 General .25
6.2 Temperature limitation.27
6.3 Determination of the limiting temperature values.27
7 Constructional requirements .27
7.1 General .27
7.2 Determination of possible faults.29
7.3 Switching contacts.41
7.4 External connections .41
7.5 Protection of bare live parts .41
7.6 Cells and batteries .41
7.7 Protective devices .47
8 Type tests .49
8.1 Tests on the compound – water absorption test .49
8.2 Tests on the apparatus .49
9 Routine verifications and tests.57
9.1 Visual inspections .57
9.2 Dielectric strength test.57
10 Marking.59
Annex A (informative) Basic requirements for compounds for encapsulation “mD”
apparatus .61
Annex B (normative) Allocation of test samples.63
Annex C (normative) Test procedure during thermal cycling test.65
Figure 1 – Distances between free surface of compound and components or
conductors .33
Figure 2 – Distances between the wall or the free surface of the compound and the
components or conductors.35

61241-18” IEC:2004 – 5 –
Figure 3 – Distances between the wall or the free surface of the compound and the
components or conductors.37
Figure 4 – Minimum distances for multi-layer printed wiring boards .41
Figure A.1  Basic requirements for compounds for encapsulation “mD” apparatus .61
Figure C.1 – Test procedure during thermal cycling test .65
Table 1 – Distances through the compound.31
Table 2  Thickness of compound between the free surface of the compound and
components or conductors.33
Table 3 – Thickness of the compound between the wall or the free surface of the
compound and the components or conductors.35
Table 4 – Thickness of the compound between the wall or the free surface of the
compound and the components or conductors.37
Table 5 – Minimum distances for multi-layer printed
...

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