National foreword

This British Standard is the UK implementation of EN IEC/IEEE 62395‑2:2026, incorporating corrigendum October 2026. It is identical to IEC/IEEE 62395‑2:2024. It supersedes BS EN 62395‑2:2013, which will be withdrawn on 31 July 2029.

The UK participation in its preparation was entrusted to Technical Committee RHE/24, Heating systems, water based cooling systems in buildings and industrial electroheating equipment.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2026.

This European Standard was approved by CENELEC on 2026-05-18. 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, 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.

European foreword

This document (EN 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".

The following dates are fixed:

This document supersedes 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.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A complete listing of these bodies can be found on the CENELEC website.

Endorsement notice

The text of the International Standard IEC/IEEE 62395-2:2024 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 standard indicated:

FOREWORD

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 addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC document(s)"). 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.
IEEE Standards documents are developed within IEEE Societies and Standards Coordinating Committees of the IEEE Standards Association (IEEE SA) Standards Board. IEEE develops its standards through a consensus development process, approved by the American National Standards Institute, which brings together volunteers representing varied viewpoints and interests to achieve the final product. Volunteers are not necessarily members of IEEE and serve without compensation. While IEEE administers the process and establishes rules to promote fairness in the consensus development process, IEEE does not independently evaluate, test, or verify the accuracy of any of the information contained in its standards. Use of IEEE Standards documents is wholly voluntary. IEEE documents are made available for use subject to important notices and legal disclaimers (seehttps://standards.ieee.org/ipr/disclaimers.htmlfor more information).
IEC collaborates closely with IEEE in accordance with conditions determined by agreement between the two organizations. This Dual Logo International Standard was jointly developed by the IEC and IEEE under the terms of that agreement.
The formal decisions of 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 IEC National Committees. The formal decisions of IEEE on technical matters, once consensus within IEEE Societies and Standards Coordinating Committees has been reached, is determined by a balanced ballot of materially interested parties who indicate interest in reviewing the proposed standard. Final approval of the IEEE standards document is given by the IEEE Standards Association (IEEE SA) Standards Board.
IEC/IEEE Publications have the form of recommendations for international use and are accepted by IEC National Committees/IEEE Societies in that sense. While all reasonable efforts are made to ensure that the technical content of IEC/IEEE Publications is accurate, IEC or IEEE cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.
In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications (including IEC/IEEE Publications) transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC/IEEE Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
IEC and IEEE do not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC and IEEE are not responsible for any services carried out by independent certification bodies.
All users should ensure that they have the latest edition of this publication.
No liability shall attach to IEC or IEEE or their directors, employees, servants or agents including individual experts and members of technical committees and IEC National Committees, or volunteers of IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Association (IEEE SA) Standards Board, for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC/IEEE Publication or any other IEC or IEEE Publications.
Attention is drawn to the normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication.
Attention is drawn to the possibility that implementation of this IEC/IEEE Publication may require use of material covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. IEC or IEEE shall not be held responsible for identifying Essential Patent Claims for which a license may be required, for conducting inquiries into the legal validity or scope of Patent Claims or determining whether any licensing terms or conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of this standard are expressly advised that determination of the validity of any patent rights, and the risk of infringement of such rights, is entirely their own responsibility.

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.

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:

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.

The text of this International Standard is based on the following IEC documents:

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.

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

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;
operating at safe temperatures when designed, installed, and maintained in accordance with IEC/IEEE 62395‑2;
having at least the minimum levels of overcurrent and earth-fault protection required in IEC/IEEE 62395‑1 and IEC/IEEE 62395‑2.

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 personnel carry out especially critical work, such as the installation of connections and terminations. Installations are intended to be carried out under the supervision of a qualified person who has undergone supplementary training in electric trace heating systems.

This document does not cover induction, impedance or skin effect heating.

Trace heating systems and surface heating systems can be grouped into different types of installations. These are characterized by different requirements for testing and are usually certified for a specific type of installation or application. Typical applications for the different types of installation are shown in Table 1.

2 Normative references

3 Terms and definitions

4 Surface heating of vessels and piping systems

4.1 Application description

4.2 Design information - General

4.3 Thermal system design

4.4 Electrical design

4.5 Control and monitoring system design

4.6 Special design considerations

4.7 Installation

4.8 Maintenance

4.9 Repair

5 Roof and gutter deicing

5.1 Application description

5.2 Design information - General

5.3 Thermal design

5.4 Electrical design

5.5 Control and monitoring system design

5.6 Special design considerations

5.7 Installation

5.8 Maintenance

5.9 Repair

6 Rail heating

6.1 Application description

6.2 Design information

6.3 Thermal design

6.4 Electrical design

6.5 Control and monitoring system design

6.6 Special design considerations

6.7 Installation

6.8 Maintenance

6.9 Repair

7 Snow melting

7.1 Application description

7.2 Design information

7.3 Thermal design - Power output (heat load) determination

7.4 Electrical design

7.5 Control and monitoring system design

7.6 Special design considerations

7.7 Installation

7.8 Maintenance

7.9 Repair

8 Floor warming

8.1 Application description

8.2 Design information

8.3 Thermal design - Heat load determination

8.4 Electrical design

8.5 Control and monitoring system design

8.6 Special design consideration

8.7 Installation

8.8 Maintenance

8.9 Repair

9 Frost heave prevention

9.1 Application description

9.2 Design information

9.3 Heat load determination

9.4 Electrical design

9.5 Control and monitoring system design

9.6 Special design considerations

9.7 Installation

9.8 Maintenance

9.9 Repair

10 Underground thermal energy storage systems

10.1 Application description

10.2 Design information

10.3 Thermal design - Heat-loss determination

10.4 Electrical design

10.5 Control and monitoring system design

10.6 Special design considerations when trace heaters are located in sand layer

10.7 Installation

10.8 Maintenance

10.9 Repair

Bibliography