EN 62395-2:2013

SLOVENSKI STANDARD
01-februar-2014
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SIST-TS CLC/TS 62395-2:2011
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Electrical resistance trace heating systems for industrial and commercial applications -
Part 2: Application guide for system design, installation and maintenance
Elektrische Begleitheizungen (Trace- Widerstandsheizungen) für industrielle und
gewerbliche Zwecke - Teil 2: Anwendungsleitfaden für Systementwurf, Installation und
Wartung
Systèmes de traçage par résistance électrique pour applications industrielles et
commerciales - Partie 2: Guide d'application pour la conception, l'installation et la
maintenance du système
Ta slovenski standard je istoveten z: EN 62395-2:2013
ICS:
25.180.10 (OHNWULþQHSHþL Electric furnaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62395-2
NORME EUROPÉENNE
December 2013
EUROPÄISCHE NORM
ICS 25.180.10 Supersedes CLC/TS 62395-2:2010

English version
Electrical resistance trace heating systems for industrial
and commercial applications -
Part 2: Application guide for system design, installation and maintenance
(IEC 62395-2:2013)
Systèmes de traçage par résistance Elektrische Widerstands-Begleitheizungen
électrique pour applications industrielles für industrielle und gewerbliche Zwecke -
et commerciales - Teil 2: Anwendungsleitfaden für
Partie 2: Guide d'application pour la Systementwurf, Installation und Wartung
conception, l'installation et la maintenance (IEC 62395-2:2013)
du système
(CEI 62395-2:2013)
This European Standard was approved by CENELEC on 2013-10-14. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
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

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62395-2:2013 E
Foreword
The text of document 27/927/FDIS, future edition 1 of IEC 62395-2, prepared by IEC/TC 27 "Industrial
electroheating and electromagnetic processing" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62395-2:2013.

The following dates are fixed:
(dop) 2014-07-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-10-14
standards conflicting with the
document have to be withdrawn
This document supersedes CLC/TS 62395-2:2010.

- this document has been changed from a Technical Specification to a European Standard;
- design considerations for trace heating on sprinkler systems have been expanded and a figure has been
added to illustrate how to avoid undue shadowing of spray patterns from insulated sprigs close to
sprinkler heads;
- specific details of design considerations for trace heating for emergency eyewash units and safety
showers have been added.
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 62395-2:2013 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60079-30-1:2007 NOTE Harmonized as EN 60079-30-1:2007 (not modified).
IEC 60079-30-2:2007 NOTE Harmonized as EN 60079-30-2:2007 (not modified).
IEC 60335-2-83:2001 NOTE Harmonized as EN 60335-2-83:2002 (not modified).
IEC 60335-2-83:2001/A1:2008 NOTE Harmonized as EN 60335-2-83:2002/A1:2008 (not modified).
IEC 60335-2-96:2002 NOTE Harmonized as EN 60335-2-96:2002 (not modified).
IEC 60335-2-96:2002/A1:2003 NOTE Harmonized as EN 60335-2-96:2002/A1:2004 (not modified).
IEC 60335-2-96:2002/A2:2008 NOTE Harmonized as EN 60335-2-96:2002/A2:2009 (not modified).

- 3 - EN 62395-2:2013
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

Publication Year Title EN/HD Year

IEC 60519-1 - Safety in electroheating installations - EN 60519-1 -
Part 1: General requirements
IEC 62395-1 2013 Electrical resistance trace heating systems for EN 62395-1 2013
industrial and commercial applications -
Part 1: General and testing requirements

IEC 62395-2 ®
Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical resistance trace heating systems for industrial and commercial

applications –
Part 2: Application guide for system design, installation and maintenance

Systèmes de traçage par résistance électrique pour applications industrielles et

commerciales –
Partie 2: Guide d’application pour la conception, l’installation et la maintenance

du système
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 25.180.10 ISBN 978-2-8322-1082-6

– 2 – 62395-2 © IEC:2013
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 11
4 Surface heating of vessels and piping systems . 11
4.1 Application description . 11
4.1.1 General . 11
4.1.2 Environmental conditions . 11
4.1.3 Trace heating systems considerations . 12
4.2 Design information – General . 12
4.2.1 General . 12
4.2.2 Electrical system design . 12
4.2.3 Control and monitoring . 12
4.2.4 Trace heating system design . 13
4.2.5 Design information documentation . 13
4.3 Thermal system design . 14
4.3.1 General . 14
4.3.2 Design conditions . 14
4.3.3 Thermal insulation . 15
4.3.4 Heat loss determination . 19
4.3.5 Design safety factor . 20
4.3.6 Heat-up considerations . 20
4.3.7 Selection of trace heater . 21
4.3.8 Design calculations. 23
4.3.9 Theoretical sheath temperature calculations – Metallic pipe
applications . 24
4.3.10 Theoretical sheath temperature calculations – Non-metallic pipe
applications . 25
4.3.11 Design documentation . 26
4.3.12 Start-up at low ambient temperatures . 26
4.3.13 Long trace heater circuits . 27
4.3.14 Chimney effect . 27
4.4 Electrical design . 27
4.5 Control and monitoring system design . 27
4.5.1 General . 27
4.5.2 Mechanical controllers . 28
4.5.3 Electronic controllers . 28
4.5.4 Application suitability . 28
4.5.5 Location of controllers . 29
4.5.6 Location of sensors . 29
4.5.7 Alarm considerations . 30
4.5.8 Integrated control . 31
4.5.9 Flow pattern analysis . 31
4.5.10 Dead-leg control technique . 33
4.6 Special design considerations . 33
4.6.1 General . 33

62395-2 © IEC:2013 – 3 –
4.6.2 Freeze protection systems . 33
4.6.3 Sprinkler systems, fire suppression . 33
4.6.4 Hot water services/tempered water . 35
4.6.5 Safety shower design requirements . 36
4.6.6 Specialty lines . 36
4.7 Installation. 38
4.7.1 General . 38
4.7.2 Personnel aspects . 38
4.7.3 Preparatory work . 38
4.7.4 Preliminary installation of trace heating circuits . 39
4.7.5 Insulation resistance test . 39
4.7.6 Installation of trace heater systems .
...