SIST EN 50018:2001/A1:2003

SLOVENSKI SIST EN 50018:2001/A1:2003

STANDARD
marec 2003
Električne naprave za potencialno eksplozivne atmosfere - Neprodirni okrov
“d“- Dopolnilo A1
Electrical apparatus for potentially explosive atomspheres - Flameproof enclosure 'd'
ICS 29.260.20 Referenčna številka
SIST EN 50018:2001/A1:2003(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 50018/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2002
ICS 29.260.20
English version
Electrical apparatus for potentially explosive atmospheres -
Flameproof enclosure 'd'
Matériel électrique pour atmosphères Elektrische Betriebsmittel für
explosibles - explosionsgefährdete Bereiche -
Enveloppe antidéflagrante 'd' Druckfeste Kapselung 'd'
This amendment A1 modifies the European Standard EN 50018:2000; it was approved by CENELEC on
2001-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this amendment 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 amendment 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50018:2000/A1:2002 E

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EN 50018:2000/A1:2002 – 2 –
Foreword
This amendment to the European Standard EN 50018:2000 was prepared by SC 31-2,
Flameproof enclosures 'd', of Technical Committee CENELEC TC 31, Electrical apparatus for
explosive atmospheres.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as amendment A1 to EN 50018 on 2001-06-01.
The following dates were fixed:
- latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-03-01
- latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2003-06-30

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– 3 – EN 50018:2000/A1:2002
Replace the last sentece of the foreword by:
Annexes A, B, C, D and E are normative.
Add to the contents:
Annex E (normative) Cells and batteries used in flameproof 'd' enclosures
Add the following references to clause 2:
EN 60086-1 2001 Primary batteries — Part 1: General
(IEC 60086-1:2000)
EN 60127 Series Miniature fuses
(IEC 60127)
EN 60285 1994 Alkaline secondary cells and batteries — Sealed nickel-cadmium
cylindrical rechargeable single cells
(IEC 60285:1993 + corr. August 1993)
EN 60623 1995 Vented nickel-cadmium prismatic rechargeable single cells
(IEC 60623:1990 + A1:1992 + A2:1992)
EN 60662 1993 High pressure sodium vapour lamps
(IEC 60662:1980 + A2:1987 + A3:1990)
EN 61150 1993 Alkaline secondary cells and batteries — Sealed nickel-cadmium
rechargeable monobloc batteries in button cell design
(IEC 61150:1992)

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EN 50018:2000/A1:2002 – 4 –
Add Annex E:
Annex E
(normative)
Cells and batteries used in flameproof 'd' enclosures
E.1 Introduction
E.1.1 This annex contains the requirements for electrical apparatus protected by type of
protection 'd' flameproof enclosures which contains one or more cells used as batteries to provide
electrical power to circuits.
E.1.2 Irrespective of the type of electrochemical cell used, the main objective shall be to prevent
a flammable mixture of electrolytic gases (usually hydrogen and oxygen) from occurring inside the
flameproof enclosure. With this in mind, cells and batteries which are likely to release electrolytic
gas in normal use (either by natural venting or by a pressure relief valve) shall not be used inside
the flameproof enclosure.
E.2 Acceptable electrochemical systems
E.2.1  Only those cells listed in Tables E.1 and E.2 below for which IEC or CENELEC cell
standards exist shall be used.
Table E.1 — Acceptable primary cells
EN 60086-1 Positive electrode Electrolyte Negative Nominal Max. open
type electrode voltage circuit
voltage
V V
Manganese dioxide Ammonium chloride, zinc Zinc 1,5 1,73
chloride
A Oxygen Ammonium chloride, zinc Zinc 1,4 1,55
chloride
C Manganese dioxide Organic electrolyte Lithium 3,0 3,7
E Thionyl chloride (SOCl ) Non-aqueous inorganic Lithium 3,6 3,9
2
L Manganese dioxide Alkali metal hydroxide Zinc 1,5 1,65
S Silver oxide (Ag O) Alkali metal hydroxide Zinc 1,55 1,63
2
T Silver oxide (AgO, Ag O) Alkali metal hydroxide Zinc 1,55 1,87
2
* Sulphur dioxide Non-aqueous organic Lithium 3,0 3,0
salt
* Mercury Alkali metal hydroxide Zinc Data Data
awaited awaited
NOTE 1 Zinc/Manganese dioxide cells are listed in EN 60086-1 but not classified by a type letter
NOTE 2 Those marked * may only be used once an IEC or CENELEC cell standard exists.

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– 5 – EN 50018:2000/A1:2002
Table E.2 — Secondary cells
Relevant Type Electrolyte Nominal Max. open
IEC/CENELEC voltage circuit
Standards/type
voltage
V V
Type K
EN 60285
Potassium hydroxide
EN 60623 Nickel-cadmium 1,2 1,55
(SGl.3)
EN 60662
EN 61150
Data awaited Data awaited
* Lithium Non-aqueous organic salt
* Nickel metal hydride Potassium hydroxide 1,2 1,5
NOTE  Those marked * may only be used once an IEC or CENELEC cell standard exists.
E.3 General requirements for cells (or batteries) inside flameproof enclosures
E.3.1 The following restrictions of use shall apply to certain types of cells:
a) vented or open secondary cells shall not be used to form a battery inside flameproof
enclosures;
b) sealed valve regulated cells may be used inside a flameproof enclosure; but for discharge
purposes only;
c) subject to the requirements of clause E.5 sealed gas tight secondary cells may be recharged
inside flameproof enclosures.
E 3.2 Flameproof enclosures containing a battery shall carry the warning label: "Do not open
when an explosive gas atmosphere is present".
This need not apply when the battery and its associated connected circuits conform to EN 50020
and the battery is not recharged in service (see EN 50020, 7.4.7).
E.3.3 Batteries and their associated safety devices shall be securely mounted (e.g. held in place
by a purpose designed clip or bracket).
E.3.4 There shall be no relative movement between the battery and the associated safety
device or devices such as would impair conformity with the requirements of the type of protection
concerned.
NOTE Conformity with E.3.3 and E.3.4 should be checked before and after the relevant mechanical impact/drop test
required by EN 50014, Electrical apparatus for potentially explosive atmospheres — General requirements.
E.4 Arrangement of safety devices
E.4.1 Prevention of excessive temperature and cell damage
E.4.1.1 Under short circuit discharge conditions, batteries shall either meet both a) and b)
below, or be fitted with a safety device, as described in E.4.1.2:

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EN 50018:2000/A1:2002 – 6
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