prEN IEC/IEEE 62395-2:2026

SLOVENSKI STANDARD
01-marec-2026
Industrijski in komercialni sistemi električnih uporovnih grelnih trakov - 2. del:
Vodilo za načrtovanje sistema, namestitev in vzdrževanje
Electrical resistance trace heating systems for industrial and commercial applications -
Part 2: Application guide for system design, installation and maintenance
Elektrische Widerstands-Begleitheizungen für industrielle und gewerbliche Zwecke - Teil
2: Anwendungsleitfaden für Systemauslegung, 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: prEN IEC/IEEE 62395-2:2026
ICS:
25.180.10 Električne peči Electric furnaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN IEC/IEEE 62395-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 25.180.10 Will supersede EN 62395-2:2013
English Version
Electrical resistance trace heating systems for industrial and
commercial applications - Part 2: Application guide for system
design, installation and maintenance
(IEC/IEEE 62395-2:2024)
Systèmes de traçage par résistance électrique pour Elektrische Widerstands-Begleitheizungen für industrielle
applications industrielles et commerciales - Partie 2: Guide und gewerbliche Zwecke - Teil 2: Anwendungsleitfaden für
d'application pour la conception, l'installation et la Systemauslegung, Installation und Wartung
maintenance du système (IEC/IEEE 62395-2:2024)
(IEC/IEEE 62395-2:2024)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-04-10.

The text of this draft consists of the text of IEC/IEEE 62395-2:2024.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 82535 Ref. No. prEN IEC/IEEE 62395-2:2026 E

European foreword
This document (prEN IEC/IEEE 62395-2:2026) consists of the text of IEC/IEEE 62395-2:2024 prepared
by IEC/TC 27 "Industrial electroheating and electromagnetic processing".
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this document has (doa) dav+ 6 months
to be announced at national level
• latest date by which this document has to be (dop) dav+ 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards conflicting (dow) dav+ 36 months
with this document have to be withdrawn (to be confirmed or
modified when voting)
This document will supersede EN 62395-2:2013 and all of its amendments and corrigenda (if any).
This document is read in conjunction with EN IEC/IEEE 62395-1.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where 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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC/IEEE 62395-1 2024 Electrical resistance trace heating systems EN IEC/IEEE —
for industrial and commercial applications - 62395-1
Part 2: Application guide for system
design, installation and maintenance

Under preparation. Stage at the time of Enquiry: prEN IEC/IEEE 62395-1:2026.
IEC/IEEE 62395-2 ®
Edition 1.0 2024-06
INTERNATIONAL
STANDARD
colour
inside
Electrical resistance trace heating systems for industrial and commercial

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

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.180.10 ISBN 978-2-8322-8826-9

– 2 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
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 . 13
4.2.4 Trace heating system design . 14
4.2.5 Design information documentation . 14
4.3 Thermal system design . 14
4.3.1 General . 14
4.3.2 Design conditions . 15
4.3.3 Thermal insulation . 15
4.3.4 Heat loss determination . 19
4.3.5 Design safety factor . 21
4.3.6 Heat-up considerations . 21
4.3.7 Selection of trace heater . 22
4.3.8 Design calculations . 25
4.3.9 Theoretical sheath temperature calculations – Metallic pipe applications . 25
4.3.10 Theoretical sheath temperature calculations – Non-metallic pipe
applications . 26
4.3.11 Design documentation . 27
4.3.12 Start-up at low ambient temperatures . 28
4.3.13 Long trace heater circuits . 28
4.3.14 Chimney effect . 28
4.4 Electrical design . 28
4.5 Control and monitoring system design . 29
4.5.1 General . 29
4.5.2 Mechanical temperature controllers . 29
4.5.3 Electronic temperature controllers . 29
4.5.4 Application suitability . 30
4.5.5 Location of controllers . 31
4.5.6 Location of sensors . 31
4.5.7 Alarm considerations . 32
4.5.8 Integrated control . 33
4.5.9 Flow pattern analysis . 33
4.5.10 Dead-leg control technique . 35
4.5.11 Monitoring requirements for fire sprinkler systems . 35
4.6 Special design considerations . 35
4.6.1 General . 35

IEC/IEEE 62395-2:2024 © IEC/IEEE 2024 – 3 –
4.6.2 Freeze protection systems . 35
4.6.3 Sprinkler systems, fire suppression. 36
4.6.4 Hot water services/tempered water . 37
4.6.5 Safety shower design requirements . 38
4.6.6 Specialty lines . 38
4.7 Installation . 40
4.7.1 General . 40
4.7.2 Personnel aspects . 40
4.7.3 Preparatory work . 41
4.7.4 Preliminary installation of trace heating circuits . 41
4.7.5 Pre-installation insulation resistance test . 41
4.7.6 Installation of trace heater systems . 42
4.7.7 Installation of control and monitoring equipment . 44
4.7.8 Necessary modifications . 45
4.7.9 Installation of the thermal insulation system . 45
4.7.10 Installation of electrical power . 47
4.7.11 Commissioning . 47
4.8 Maintenance . 48
4.8.1 General . 48
4.8.2 Training of maintenance personnel . 49
4.8.3 Frequency of inspection . 49
4.8.4 Maintenance program documentation . 49
4.8.5 Visual evaluation . 49
4.8.6 Electrical evaluation. 50
4.8.7 Review of the electrical protection system . 50
4.9 Repair . 50
4.9.1 General . 50
4.9.2 Fault location . 50
4.9.3 Practicability of repair to electric trace heaters . 51
4.9.4 Repair techniques for electrical trace heaters . 51
5 Roof and gutter deicing . 52
5.1 Application description . 52
5.2 Design information – General . 52
5.3 Thermal design . 53
5.4 Electrical design . 53
5.5 Control and monitoring system design . 53
5.6 Special design considerations . 54
5.7 Installation . 54
5.7.1 General . 54
5.7.2 Trace heaters and component mounting . 54
5.8 Maintenance . 57
5.9 Repair . 57
6 Rail heating . 57
6.1 Application description . 57
6.1.1 General . 57
6.1.2 Switch point heating9 . 58
6.1.3 Contact/live rail heating . 58
6.1.4 Track heating . 58
6.1.5 Catenary/pantograph shoe heating . 58

– 4 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
6.2 Design information . 59
6.2.1 General . 59
6.2.2 Weather data . 59
6.2.3 Rail system description . 59
6.2.4 System design . 59
6.3 Thermal design . 60
6.3.1 Heating load determination . 60
6.3.2 Typical heating load . 60
6.4 Electrical design . 60
6.5 Control and monitoring system design . 60
6.6 Special design considerations . 61
6.6.1 Electrical considerations . 61
6.6.2 Finite element analysis . 61
6.7 Installation . 61
6.7.1 General . 61
6.7.2 Point heating . 62
6.7.3 Swing nose crossing . 62
6.7.4 Clamp lock heating . 63
6.7.5 Contact/live rail heating and track heating . 63
6.7.6 Catenary/pantograph shoe heating . 64
6.8 Maintenance . 64
6.9 Repair . 64
7 Snow melting . 64
7.1 Application description . 64
7.2 Design information . 65
7.2.1 General . 65
7.2.2 Weather data . 65
7.2.3 Construction details of workpiece . 65
7.2.4 Electrical considerations . 65
7.2.5 System performance level . 65
7.2.6 Trace heater layout and component mounting . 66
7.3 Thermal design – Power output (heat load) determination . 69
7.4 Electrical design . 70
7.5 Control and monitoring system design . 70
7.6 Special design considerations . 70
7.7 Installation . 71
7.8 Maintenance . 71
7.9 Repair . 71
8 Floor warming . 72
8.1 Application description . 72
8.2 Design information . 72
8.2.1 General . 72
8.2.2 Environmental data . 72
8.2.3 Construction details of workpiece . 72
8.2.4 Electrical considerations . 72
8.2.5 Trace heater layout and component mounting . 72
8.3 Thermal design – Heat load determination . 74
8.4 Electrical design . 75
8.5 Control and monitoring system design . 75

IEC/IEEE 62395-2:2024 © IEC/IEEE 2024 – 5 –
8.6 Special design consideration . 75
8.7 Installation . 76
8.8 Maintenance . 76
8.9 Repair . 76
9 Frost heave prevention . 76
9.1 Application description . 76
9.2 Design information . 77
9.2.1 General . 77
9.2.2 Construction details of the floor . 77
9.2.3 Electrical considerations . 77
9.3 Heat load determination . 77
9.3.1 General . 77
9.3.2 Trace heater layout and component mounting . 79
9.4 Electrical design . 79
9.5 Control and monitoring system design . 79
9.5.1 Control options . 79
9.5.2 Monitoring . 79
9.6 Special design considerations . 79
9.7 Installation . 80
9.8 Maintenance . 80
9.9 Repair . 80
10 Underground thermal energy storage systems . 80
10.1 Application description . 80
10.2 Design information . 81
10.2.1 General . 81
10.2.2 Environmental data . 81
10.2.3 Construction details of building . 81
10.2.4 Electrical considerations . 81
10.2.5 Trace heater layout and component mounting . 81
10.3 Thermal design – Heat-loss determination . 82
10.4 Electrical design . 82
10.5 Control and monitoring system design . 82
10.6 Special design considerations when trace heaters are located in sand layer . 83
10.7 Installation . 83
10.7.1 General . 83
10.7.2 Installation in sand . 83
10.7.3 Installation in concrete . 83
10.8 Maintenance . 84
10.9 Repair . 84
Annex A (informative) Pre-installation checks . 85
Annex B (informative) Trace heater commissioning record . 86
Annex C (informative) Maintenance schedule and log record . 87
Bibliography . 88

Figure 1 – Thermal insulation – Weather-barrier installation . 17
Figure 2 – Typical temperature profile . 19
Figure 3 – Equilibrium conditions for workpiece maintenance . 24

– 6 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
Figure 4 – Equilibrium conditions for upper limit evaluation . 24
Figure 5 – Heated tank example . 34
Figure 6 – Bypass example . 34
Figure 7 – Fire sprinkler sprig: tapered thermal insulation . 37
Figure 8 – Double containment system . 39
Figure 9 – Gravity flow piping systems . 40
Figure 10 – Ice dam formation . 52
Figure 11 – Downspout to underground drain . 53
Figure 12 – Roof and gutter trace heater arrangement . 55
Figure 13 – Gutter detail . 55
Figure 14 – Typical roof mounting methods . 56
Figure 15 – Drain detail for flat roof. 57
Figure 16 – Typical positioning of point trace heater on stock rail and switch rail . 62
Figure 17 – Typical positioning of trace heater on swing nose crossing . 62
Figure 18 – Typical clamp lock trace heater . 63
Figure 19 – Typical positioning of trace heater on steel and aluminium clad contact rails . 63
Figure 20 – Typical positioning of trace heater in pantograph shoe . 64
Figure 21 – Snow melting trace heater embedded in concrete. 67
Figure 22 – Snow melting trace heater located in conduit . 68
Figure 23 – Expansion joint detail . 69
Figure 24 – Snow melting junction box location . 69
Figure 25 – Typical floor warming trace heater mounting . 74
Figure 26 – Typical floor heating power requirements . 75
Figure 27 – Typical frost heave prevention substructure . 77
Figure 28 – Frost heave prevention power requirements . 78
Figure 29 – Typical underground thermal energy storage system installation . 82

Table 1 – Trace heater and surface heater types and related attributes . 10
Table 2 – Application types . 13
Table 3 – Recommendations for monitoring and control – Type II and III control . 31
Table 4 – Recommendations for hot water services and tempered water temperatures . 37
Table 5 – Minimum values of Insulation resistance. 42
Table 6 – Typical snow melting heat loads . 66

IEC/IEEE 62395-2:2024 © IEC/IEEE 2024 – 7 –
ELECTRICAL RESISTANCE TRACE HEATING SYSTEMS
FOR INDUSTRIAL AND COMMERCIAL APPLICATIONS –

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

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
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IEC collaborates closely with IEEE in accordance with conditions determined by agreement between the two
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2) The formal decisions of IEC on technical matters express, as nearly as possible, an international consensus of
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9) Attention is drawn to the possibility that implementation of this IEC/IEEE Publication may require use of material
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Users of this standard are expressly advised that determination of the validity of any patent rights, and the risk
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IEC/IEEE 62395-2 was prepared by IEC technical committee 27: Industrial electroheating and
electromagnetic, in cooperation with the Petroleum & Chemical Industry Committee of the IEEE
Industrial Applications Society, under the IEC/IEEE Dual Logo Agreement between IEC and
IEEE. It is an International Standard.

– 8 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
This document is published as an IEC/IEEE Dual Logo standard.
This standard cancels and replaces IEC 62395-2:2013. This edition constitutes a technical
revision.
This standard includes the following significant technical changes with respect to
IEC 62395-2:2013:
a) 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;
b) Specific details of design considerations for trace heating for emergency eyewash units and
safety showers have been added.
The text of this International Standard is based on the following IEC documents:
Draft Report on voting
27/1183/FDIS 27/1185/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with the rules given in the ISO/IEC Directives, Part 2,
available at www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at www.iec.ch/publications/.
This standard is intended to be used in conjunction with IEC/IEEE 62395-1.
A list of all parts in the IEC 62395 series, under the general title Electrical resistance trace
heating systems for industrial and commercial applications, can be found on the IEC website.
The IEC Technical Committee and IEEE Technical Committee have decided that the contents
of this document will remain unchanged until the stability date indicated on the IEC website
under webstore.iec.ch in the data related to the specific document. At this date, the document
will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

IEC/IEEE 62395-2:2024 © IEC/IEEE 2024 – 9 –
INTRODUCTION
IEC/IEEE 62395-1 provides the essential requirements and testing appropriate to electrical
resistance trace heating equipment used in industrial and commercial applications. While some
of this work already exists in national or international standards, this document has collated
much of this existing work and added considerably to it.
IEC/IEEE 62395-2 provides detailed recommendations for the system design, installation,
maintenance and repair of electrical resistance trace heating systems in industrial and
commercial applications which can include piping, vessels, roofs and concrete slab heating
applications.
It is the objective of the IEC/IEEE 62395 series that, when in normal use, electrical trace heating
systems operate safely under their defined conditions of use, by
a) employing heaters of the appropriate construction so as to meet the test criteria and
requirements detailed in IEC/IEEE 62395-1. The construction includes a metallic sheath,
braid, screen or equivalent electrically conductive covering;
b) operating at safe temperatures when designed, installed, and maintained in accordance with
IEC/IEEE 62395-2;
c) having at least the minimum levels of overcurrent and earth-fault protection required in
IEC/IEEE 62395-1 and IEC/IEEE 62395-2.

– 10 – IEC/IEEE 62395-2:2024 © IEC/IEEE 2024
ELECTRICAL RESISTANCE TRACE HEATING SYSTEMS
FOR INDUSTRIAL AND COMMERCIAL APPLICATIONS –

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

1 Scope
This part of IEC/IEEE 62395 provides detailed recommendations for the system design,
installation, maintenance and repair of electrical resistance trace heating systems in industrial
and commercial applications. This document does not include or provide for any applications in
potentially explosive atmospheres.
This document pertains to trace heating systems that can comprise either factory fabricated or
field-assembled (work-site) units, and which can be series or parallel trace heaters, or surface
heaters (heater pads or heater panels) that have been assembled and/or terminated in
accordance with the manufacturer's instructions.
The products covered by this document are intended to be installed by persons who are suitably
trained in the techniques required and that only trained
...