1、NORME INTERNATIONALECEIIECINTERNATIONALSTANDARD 62395-1Premire ditionFirst edition2006-08Systmes de traage par rsistance lectrique pour applications industrielles et commerciales Partie 1: Exigences gnrales et dessai Electrical resistance trace heating systems for industrial and commercial applicati
2、ons Part 1: General and testing requirements Pour prix, voir catalogue en vigueur For price, see current catalogue IEC 2006 Droits de reproduction rservs Copyright - all rights reservedAucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun pr
3、ocd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de lditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publish
4、er. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch CODE PRIX PRICE CODE VCommission Electrotechnique InternationaleInternational Electrotechnical Commiss
5、ionF_ m gZ j hgZy We_dl j hl_ogbq_kdZy Dhfbkkby 1 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL RESISTANCE TRACE HEATING SYSTEMS FOR INDUSTRIAL AND COMMERCIAL APPLICATIONS Part 1: General and testing requirements FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide
6、 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 activi
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8、ealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determin
9、ed by agreement between the two organizations. 2) The formal decisions or agreements 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 Committee
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11、y are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication a
12、nd the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that the
13、y have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature w
14、hatsoever, whether direct or indirect, or for costs (including legal fees) andexpenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publ
15、ications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International St
16、andard IEC 62395-1 has been prepared by IEC technical committee 27: Industrial electroheating equipment. The text of this standard is based on the following documents: FDIS Report on voting 27/533/FDIS 27/547/RVD Full information on the voting for the approval of this standard can be found in the re
17、port on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 2 A list of all parts of IEC 62395, under the general title Electrical resistance trace heating systems for industrial and commercial applications, can be found on the IE
18、C website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn
19、; replaced by a revised edition, or amended. CONTENTSINTRODUCTION.41 Scope and object52 Normative references .63 Terms and definitions .64 General requirements .114.1 General .114.2 Metallic braids or sheaths 114.3 Electrical circuit protection requirements for branch circuits114.4 Control and tempe
20、rature requirements .125 Testing.125.1 Type tests General .125.2 Type tests .125.3 Type tests Additional tests for outdoor exposed area installations without thermal insulation 255.4 Type tests Additional tests for installations with embedded trace heater.275.5 Type tests Additional tests for instal
21、lations with trace heater inside conduit or piping275.6 Routine tests .286 Marking286.1 General .286.2 Product markings.286.3 Markings for field-assembled components 297 Installation instructions .29Annex ZA (normative) Normative references to international publications with their corresponding Euro
22、pean publications31 Bibliography .30Figure 1 Flammability test 15Figure 2 Impact test .16Figure 3 Cold bend test18Figure 4 Moisture resistance test19Figure 5 Verification of rated output21Figure 6 Verification of sheath temperature using system approach 23Figure 7 Maximum sheath temperature using th
23、e product classification approach24Figure 8 Abrasion test27Table 1 Test voltages for the dielectric test.13 3 INTRODUCTIONIEC 62395-1 provides the essential requirements and testing appropriate to electrical resistance trace heating equipment used in industrial and commercial applications. While som
24、e of this work already exists in national or international standards, this standard has collated much of this existing work and added considerably to it. IEC/TS 62395-2 provides detailed recommendations for the system design, installation and maintenance of electric trace heating systems in industri
25、al and commercial applications. It is the objective of IEC 62395 that, when in normal use, electrical trace heating systems should operate safely under their defined conditions of use, bya) employing heaters of the appropriate construction and meeting the test criteria detailed in Part 1. The constr
26、uction should include a metallic sheath, braid, screen or equivalent electrically conductive covering; b) operating at safe temperatures when designed, installed, and maintained in accordance with Part 2; c) having at least the minimum levels of overcurrent and ground fault protection recommended in
27、 Part 2. Some tests of Part 1 differ from similar tests developed by TC 20 and are to be reviewed in the future. These and other tests are almost identical to the tests given in IEC 62086-1:20011and are duplicated in Part 1 for completeness (see notes in the text). 1Permission to reproduce the text
28、of several tests from IEC 62086-1:2001 that are not specific to explosive gas atmospheres has been granted by TC 31. 4 ELECTRICAL RESISTANCE TRACE HEATING SYSTEMSFOR INDUSTRIAL AND COMMERCIAL APPLICATIONS Part 1: General and testing requirements 1 Scope and object This part of IEC 62395 specifies re
29、quirements for electrical resistance trace heating systems and includes general test requirements. This standard pertains to trace heating systems that may comprise either factory-fabricated or field-assembled (work-site) units, and which may be series heater cables, parallel heater cables, heater p
30、ads or heater panels that have been assembled and/or terminated in accordance with the manufacturers instructions for connection to voltage supplies up to and including 450-750 V. This standard also includes requirements for termination assemblies and control methods used with trace heating systems.
31、 This standard does not include or provide for any applications in potentially explosive atmospheres. This standard does not cover induction, impedance or skin effect heating. Trace heating systems can be grouped into different types of applications and the different conditions found during and afte
32、r installation necessitate different requirements for testing. Trace heating systems are usually certified for a specific type of installation or application. Typical applications for the different types of installation include, but are not limited to: a) installations of trace heating for surface h
33、eating on pipes, vessels and associated equipment applications include: freeze protection and temperature maintenance; hot water lines; oil and chemical lines; sprinkler system mains and supply piping; b) outdoor exposed area installations of trace heating applications include: roof de-icing; gutter
34、 and down-spout de-icing; catch basins and drains; rail heating2;c) installation with embedded trace heating applications include: snow melting; frost heave protection; floor warming; 2Further evaluation may be required to address application specific conditions such as fluctuations in impressed vol
35、tage and voltage spikes. 5 energy storage systems; door frames; d) installations with trace heating inside conduit or piping applications include: snow melting in conduit; frost heave protection in conduit; floor warming in conduit; energy storage systems in conduit; internal trace heating for freez
36、e protection of potable water lines; enclosed drains and culverts. 2 Normative references 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 docu
37、ment (including any amendments) applies. IEC 60050-841:2004, International Electrotechnical Vocabulary (IEV) Part 841: Industrial electroheatIEC 60068-2-9, Environmental testing Part 2: Tests Guidance for solar radiation testingIEC 60519-1:2003, Safety in electroheat installations Part 1: General re
38、quirements IEC 60519-10:2005, Safety in electroheat installations Part 10: Particular requirements for electrical resistance trace heating systems for industrial and commercial applications 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-841 an
39、d in IEC 60519-10, some of which are repeated here, as well as the following, apply. 3.1 ambient temperature average temperature of air or another medium in the vicinity of the equipment NOTE Where electrical trace heaters are enclosed in thermal insulation, the ambient temperature is the temperatur
40、e exterior to such thermal insulation. IEV 826-10-03, modified 3.2 branch circuit that portion of the wiring installation between the overcurrent device protecting the circuit and the trace heater(s)3.3 connections (terminations)3.3.1 cold lead (for trace heater)electrically insulated conductor or c
41、onductors used to connect a trace heater to the branch circuit and designed so that it does not produce significant heat 6 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 integral components factory-
42、fabricated or field-assembled electrical terminations and connections, such as heat shrink terminations, moulded end seals or splices, which conform to the general shape of the trace heater and are exposed to the same environments as the trace heater 3.3.4 power termination termination applied to th
43、e end of a trace heater at which the power is supplied 3.3.5 tee electrical connection of trace heaters, in series or in parallel, to accommodate a branch in the circuit and resembling the shape of a capital T3.4 dead leg segment of process piping segregated from the normal flow pattern for the purp
44、ose of providing a heat-loss reference3.5 design loading minimum power that will meet the design requirements, in the worst conditions, after voltage and resistance tolerances and appropriate safety factors have been considered 3.6 factory-fabricated unit or set trace heater unit or set, including t
45、he necessary terminations and connections, assembled by the manufacturer 3.7 field-assembled unit or set trace heaters supplied in bulk with terminating components to be assembled at the work site3.8 heat loss energy flow from a pipe, vessel or equipment to its surroundings 3.9 heat sink part that c
46、onducts and dissipates heat away from a workpiece NOTE Typical heat sinks are pipe shoes, pipe supports and items of large mass such as valve actuators or pump bodies. 3.10 heat transfer aids thermally conductive materials, such as metallic foils or heat transfer compounds used to increase the heat-
47、transfer efficiency from trace heaters to the workpiece 7 3.11 heater pad trace heater comprising series or parallel connected elements having sufficient flexibility to conform to the shape of the surface to be heated 3.12 heater panel non-flexible trace heater comprising series or parallel connecte
48、d elements fabricated to conform to the general shape of the surface to be heated 3.13 high limit temperature maximum allowable temperature of the system, including piping, fluid and trace heating system 3.14 maximum ambient temperature highest ambient temperature at which the trace heater is operab
49、le and should perform according to specified requirements3.15 maximum withstand temperature maximum operating or exposure temperature that does not adversely affect the thermal stability of the trace heater and its component parts 3.16 metallic covering metallic sheath, braid, screen or equivalent electrically conductive covering used to provide an electrical path to
