EN 62086-1:2005

EUROPEAN STANDARD EN 62086-1
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2005

ICS 29.260.20
English version
Electrical apparatus for explosive gas atmospheres –
Electrical resistance trace heating
Part 1: General and testing requirements
(IEC 62086-1:2001 + corrigendum 2003)

Matériel électrique pour atmosphères Elektrische Betriebsmittel für
explosives gazeuses – gasexplosionsgefährdete Bereiche –
Traçage par résistance électrique Elektrische Widerstands-Begleitheizungen
Partie 1: Règles générales et d'essais Teil 1: Allgemeine Anforderungen und
(CEI 62086-1:2001 + corrigendum 2003) Prüfanforderungen
(IEC 62086-1:2001 + Corrigendum 2003)

This European Standard was approved by CENELEC on 2005-02-01. 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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62086-1:2005 E
Foreword
The text of the International Standard IEC 62086-1:2001 and its corrigendum February 2003, prepared
by IEC TC 31, Electrical apparatus for explosive atmospheres, was submitted to the CENELEC
Unique Acceptance Procedure and was approved by CENELEC as EN 62086-1 on 2005-02-01
without any modification.
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) 2006-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62086-1:2001 and its corrigendum February 2003 was
approved by CENELEC as a European Standard without any modification.
__________
- 3 - EN 62086-1:2005
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

1)
IEC 60050-151 1978 International Electrotechnical Vocabulary - -
(IEV)
Part 151: Electrical and magnetic devices

2)
IEC 60050-426 - Chapter 426: Electrical apparatus for - -
explosive atmospheres
3)
IEC 60079-0 1998 Electrical apparatus for explosive gas - -
atmospheres
Part 0: General requirements
2) 4)
IEC 60364-3 - Electrical installations of buildings HD 384.3 S2 1995
(mod) Part 3: Assessment of general
characteristics
1)
IEC 60050-151:1978 is superseded by IEC 60050-151:2001.
2)
Undated reference.
3)
IEC 60079-0:1998 is superseded by IEC 60079-0:2004, which is harmonized as EN 60079-0:2005 (mod).
4)
Valid edition at date of issue.

NORME CEI
INTERNATIONALE IEC
62086-1
INTERNATIONAL
Première édition
STANDARD
First edition
2001-01
Matériel électrique pour atmosphères
explosives gazeuses –
Traçage par résistance électrique –
Partie 1:
Règles générales et d'essais
Electrical apparatus for explosive
gas atmospheres –
Electrical resistance trace heating –
Part 1:
General and testing requirements
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62086-1 © IEC:2001 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .7
Clause
1 Scope . 9
2 Normative references. 9
3 Definitions. 9
4 General requirements . 19
5 Testing. 23
6 Marking. 45
Bibliography . 49
Figure 1 – Flammability test . 25
Figure 2 – Impact test .29
Figure 3 – Cold bend test – Type test. 31
Figure 4 – Moisture resistance test. 33
Figure 5 – Verification of rated output – Type test . 37
Figure 6 – Verification of sheath temperature using system approach . 41
Figure 7 – Maximum sheath temperature using the product classification approach . 43
Table 1 – Test voltages for the dielectric test . 23

62086-1 © IEC:2001 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––––
ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES –
ELECTRICAL RESISTANCE TRACE HEATING –
Part 1: General and testing requirements
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62086-1 has been prepared by IEC technical committee 31:
Electrical apparatus for explosive atmospheres.
The text of this standard is based on the following documents:
FDIS Report on voting
31/343/FDIS 31/348/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that the contents of this publication will remain unchanged
until 2003. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
The contents of the corrigendum of February 2003 have been included in this copy.

62086-1 © IEC:2001 – 7 –
INTRODUCTION
This part of IEC 62086 is intended to provide a comprehensive overview of the essential
requirements and testing appropriate to electric surface heating equipment used in explosive
gas atmospheres. The requirements of this standard are considered to be the minimum
requirements for zone 1 or zone 2. While some of this work already exists in national
standards or international standards, this standard has collated much of this existing work and
added considerably to it. This standard should be read in conjunction with IEC 62086-2:
Electrical apparatus for explosive gas atmospheres – Electrical resistance trace heating –
*
Part 2: Application guide for design, installation and maintenance .
___________
*
To be published.
62086-1 © IEC:2001 – 9 –
ELECTRICAL APPARATUS FOR EXPLOSIVE GAS ATMOSPHERES –
ELECTRICAL RESISTANCE TRACE HEATING –
Part 1: General and testing requirements
1 Scope
This part of IEC 62086 specifies general and testing requirements for electrical resistance
trace heaters for application in explosive gas atmospheres. The standard covers trace heaters
that may comprise either factory- or field- (work-site) assembled units, and which may be
series heating cables, parallel heating cables or heating pads and heating panels that have
been assembled and/or terminated in accordance with the manufacturer’s instructions.
This standard also includes requirements for termination assemblies and control methods
used with trace heating. The hazardous areas referred to by this standard are those defined in
IEC 60079-10.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 62086. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 62086 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 60050(151):1978, International Electrotechnical Vocabulary (IEV) – Chapter 151:
Electrical and magnetic devices
IEC 60050(426), International Electrotechnical Vocabulary (IEV) – Chapter 426: Electrical
apparatus for explosive atmospheres
IEC 60079-0:1998, Electrical apparatus for explosive gas atmospheres – Part 0: General
requirements
IEC 60364-3, Electrical installations of buildings – Part 3: Assessment of general characteristics
3 Definitions
For the purpose of this part of IEC 62086, the following definitions as well as the definitions
given in IEC 60050(426) and IEC 60079-0 apply.
3.1
ambient temperature
temperature surrounding the object under consideration. Where electrical trace heaters are
enclosed in thermal insulation, the ambient temperature is the temperature exterior to such
thermal insulation
62086-1 © IEC:2001 – 11 –
3.2
branch circuit
that portion of the wiring installation between the overcurrent device protecting the circuit and
the trace heater unit(s)
3.3
connections
(terminations)
3.3.1
cold lead
electrically insulated conductor or conductors used to connect a trace heater to the branch
circuit and designed so that it does not produce significant heat
3.3.2
end termination
termination, which may be heat producing, applied to a trace heater at the end opposite that
where the power is supplied
3.3.3
power termination
termination applied to the end of a trace heater at which the power is supplie
...