EN 60079-30-2:2017

SLOVENSKI STANDARD
01-januar-2018
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SIST EN 60079-30-2:2007
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Explosive atmospheres - Part 30-2: Electrical resistance trace heating - Application guide
for design, installation and maintenance IEC/IEEE 60079-30-2:2015 (MOD)
Explosionsgefährdeter Bereiche - Teil 30-2: Elektrische Widerstands-Begleitheizungen -
Anwendungsleitfaden für Entwurf, Installation und Instandhaltung IEC/IEEE 60079-30-
2:2015 (MOD)
Atmosphères explosives - Partie 30-2: Traçage par résistance électrique - Guide
d'application pour la conception, l'installation et la maintenance IEC/IEEE 60079-30-
2:2015 (MOD)
Ta slovenski standard je istoveten z: EN 60079-30-2:2017
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60079-30-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2017
ICS 29.260.20 Supersedes EN 60079-30-2:2007
English Version
Explosive atmospheres -
Part 30-2: Electrical resistance trace heating - Application guide
for design, installation and maintenance
(IEC/IEEE 60079-30-2:2015 , modified)
Atmosphères explosives - Partie 30-2: Traçage par Explosionsgefährdeter Bereiche - Teil 30-2: Elektrische
résistance électrique - Guide d'application pour la Widerstands-Begleitheizungen - Anwendungsleitfaden für
conception, l'installation et la maintenance Entwurf, Installation und Instandhaltung
(IEC/IEEE 60079-30-2:2015 , modifiée) (IEC/IEEE 60079-30-2:2015 , modifiziert)
This European Standard was approved by CENELEC on 2017-04-03. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60079-30-2:2017 E
European foreword
This document (EN 60079-30-2:2017) consists of the text of IEC/IEEE 60079-30-2:2015 prepared by
IEC/TC 31 "Equipment for explosive atmospheres" in collaboration with IEEE Standards Association
(IEEE-SA), together with the common modifications prepared by CLC/TC 31 "Electrical apparatus for
potentially explosive atmospheres".
The following dates are fixed:
• latest date by which the document has to be implemented at (dop) 2018-04-03
national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2020-04-03
the document have to be withdrawn

This document supersedes EN 60079-30-2:2007
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC/IEEE 60079-30-2:2015 was approved by CENELEC as a
European Standard with agreed common modifications.
COMMON MODIFICATIONS
NOTE The Division method of area classification of IEC/IEEE 60079-30-2:2015 is not applicable for a European
Standard, because a correlation with the Equipment Categories according to the European Directive 2014/34/EU
is not possible. Consequently requirements for Divisions 1 and 2 and references to NFPA 70 and CSA C22.1 are
excluded from this standard.
1 Scope
Delete the following sentence in the first paragraph:
"This standard also provides guidance for explosive atmospheres incorporating the Division method of
area classification that may be applied by some users of this standard."
Delete the note:
"NOTE Information on the Division method is given in NFPA 70 and CSA C22.1."
4.1 General
Delete the following part of the second sentence in the second paragraph:
"…, and/or the Division 1 and Division 2 explosive atmospheres, …".
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-426 -  International Electrotechnical - -
Vocabulary -
Part 426: Equipment for explosive
atmospheres
IEC 60079-0 -  Explosive atmospheres - EN 60079-0 -
Part 0: Equipment - General
requirements
IEC 60079-15 -  Explosive atmospheres - EN 60079-15 -
Part 15: Equipment protection by type of
protection "n"
IEC/IEEE 60079-30-1 -  Explosive atmospheres - EN 60079-30-1 -
Part 30-1: Electrical resistance trace
heating - General and testing
requirements
Bibliography
Add the following notes for the standards indicated:
IEC 60079-14 NOTE Harmonized as EN 60079-14.
IEC 60079-17 NOTE Harmonized as EN 60079-17.
IEC 60079-7 NOTE Harmonized as EN 60079-7.
IEC 60364-1 NOTE Harmonized as HD 60364-1.

IEC/IEEE 60079-30-2 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 30-2: Electrical resistance trace heating – Application guide for design,

installation and maintenance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-2736-7

– 2 – IEC/IEEE 60079-30-2:2015
© IEC/IEEE 2015
CONTENTS
FOREWORD . 6
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 10
4 Application considerations . 10
4.1 General . 10
4.2 Corrosive areas . 11
4.3 Process temperature accuracy . 11
4.3.1 Type I . 11
4.3.2 Type II . 11
4.3.3 Type III . 11
4.4 Installation considerations . 11
5 Thermal insulation . 12
5.1 General . 12
5.2 Selection of insulating material . 12
5.3 Selection of weather barrier (cladding) . 13
5.4 Selection of economical thickness to provide optimum trace heating design. 13
5.5 Double insulation . 14
6 System design . 17
6.1 General . 17
6.2 Purpose of, and major requirement for, trace heating . 17
6.3 Training . 18
6.4 Selection of trace heater . 18
6.4.1 General . 18
6.4.2 Site-fabricated trace heaters . 18
6.4.3 Specific types of trace heating . 19
6.5 Maximum temperature determination . 19
6.5.1 General . 19
6.5.2 PTC characteristic . 19
6.5.3 Stabilized design . 20
6.5.4 Controlled design. 20
6.6 Heat up and cool down considerations . 20
6.7 Design information . 20
6.7.1 Design information documentation . 20
6.7.2 Isometric or trace heater configuration line lists and load charts . 21
6.8 Power system . 22
6.9 Earthing requirements . 22
6.10 Earth-fault protection of equipment . 23
6.11 Start-up at minimum ambient temperatures . 23
6.12 Long trace heater runs . 23
6.13 Flow pattern analysis . 23
6.14 Dead-leg control technique . 25
6.15 Chimney effect . 25
6.16 Safety shower and eyewash station design requirements . 26

IEC/IEEE 60079-30-2:2015 – 3 –
© IEC/IEEE 2015
7 Control and monitoring . 26
7.1 General . 26
7.2 Mechanical controllers . 27
7.3 Electronic controllers . 27
7.4 Application suitability . 27
7.5 Location of controllers . 27
7.6 Location of sensors . 28
7.7 Alarm considerations . 28
7.7.1 General . 28
7.7.2 Trace heating circuit alarm .
...