SIST EN 60216-4-1:2006

Electrical insulating materials - Thermal endurance properties -- Part 4-1: Ageing ovens - Single-chamber ovens

This part of IEC 60216 covers minimum requirements for  ventilated and electrically heated single-chamber ovens, with  or without forced gas circulation, for thermal endurance  evaluation of electrical insulation. It covers ovens designed to  operate over all or part of the temperature range from 20 °C  above ambient to 500 °C. It gives acceptance tests and  inservice monitoring tests for these ageing ovens.

Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens -- Teil 4-1: Wärmeschränke für die Warmlagerung - Einzelkammerwärmeschränke

Matériaux isolants électriques - Propriétés d'endurance thermique -- Partie 4-1: Etuves de vieillissement - Etuves à une chambre

Električni izolacijski materiali - Lastnosti v zvezi s toplotno vzdržljivostjo - 4-1. del: Peči za staranje - Enoprekatne peči (IEC 60216-4-1:2006)

General Information

• Status: Published
• Publication Date: 30-Sep-2006
• ICS: 25.180.10 - Electric furnaces
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: IZO - Insulating materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2006
• Due Date: 01-Oct-2006
• Completion Date: 01-Oct-2006
• Ref Project: EN 60216-4-1:2006 - Electrical insulating materials - Thermal endurance properties - Part 4-1: Ageing ovens - Single-chamber ovens

Relations

• Replaces: SIST HD 611.4.1 S1:1998 - Guide for the determination of thermal endurance properties of electrical insulating materials -- Part 4: Ageing ovens -- Section 1: Single-chamber ovens
• Effective Date: 01-Oct-2006
• Revised: SIST HD 611.4.1 S1:1998 - Guide for the determination of thermal endurance properties of electrical insulating materials -- Part 4: Ageing ovens -- Section 1: Single-chamber ovens
• Effective Date: 13-May-2010
• Replaces: SIST HD 611.4.1 S1:1998 - Guide for the determination of thermal endurance properties of electrical insulating materials -- Part 4: Ageing ovens -- Section 1: Single-chamber ovens
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60216-4-1:2006
01-oktober-2006
1DGRPHãþD
SIST HD 611.4.1 S1:1998
(OHNWULþQLL]RODFLMVNLPDWHULDOL/DVWQRVWLY]YH]LVWRSORWQRY]GUåOMLYRVWMRGHO
3HþL]DVWDUDQMH(QRSUHNDWQHSHþL,(&
Electrical insulating materials - Thermal endurance properties - Part 4-1: Ageing ovens -
Single-chamber ovens (IEC 60216-4-1:2006)
Elektroisolierstoffe - Eigenschaften hinsichtlich des thermischen Langzeitverhaltens - Teil
4-1: Wärmeschränke für die Warmlagerung - Einzelkammerwärmeschränke (IEC 60216-
4-1:2006)
Matériaux isolants électriques - Propriétés d'endurance thermique - Partie 4-1: Etuves de
vieillissement - Etuves à une chambre (CEI 60216-4-1:2006)
Ta slovenski standard je istoveten z: EN 60216-4-1:2006
ICS:
25.180.10
29.035.01
SIST EN 60216-4-1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN 60216-4-1

NORME EUROPÉENNE
May 2006
EUROPÄISCHE NORM

ICS 17.220.99; 29.035.01 Supersedes HD 611.4.1 S1:1992


English version


Electrical insulating materials -
Thermal endurance properties
Part 4-1: Ageing ovens -
Single-chamber ovens
(IEC 60216-4-1:2006)


Matériaux isolants électriques -  Elektroisolierstoffe -
Propriétés d'endurance thermique Eigenschaften hinsichtlich
Partie 4-1: Etuves de vieillissement - des thermischen Langzeitverhaltens
Etuves à une chambre Teil 4-1: Wärmeschränke
(CEI 60216-4-1:2006)
für die Warmlagerung -
Einzelkammerwärmeschränke
(IEC 60216-4-1:2006)




This European Standard was approved by CENELEC on 2006-03-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60216-4-1:2006 E

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EN 60216-4-1:2006 - 2 -
Foreword
The text of document 112/16/FDIS, future edition 4 of IEC 60216-4-1, prepared by subcommittee 15E:
Methods of test, of IEC technical committee 15: Insulating materials, which has now been merged with
IEC technical committee 98: Electrical insulation systems into IEC technical committee 112: Evaluation
and qualification of electrical insulating materials and systems (provisional title), was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 60216-4-1 on 2006-03-01.
This European Standard supersedes HD 611.4.1 S1:1992 .
The main changes with regard to HD 611.4.1 S1:1992 is the adaptation to the technical content and the
editorial form of EN 60216-4-2 and EN 60216-4-3. In addition, errors and omissions in
IEC 60216-4-1:1990 have been corrected.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60216-4-1:2006 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 60216-1 NOTE Harmonized as EN 60216-1:2001 (not modified).
IEC 60216-3 NOTE Harmonized as EN 60216-3:2002 (not modified).
IEC 60216-4-2 NOTE Harmonized as EN 60216-4-2:2000 (not modified).
IEC 60216-4-3 NOTE Harmonized as EN 60216-4-3:2000 (not modified).
IEC 60216-5 NOTE Harmonized as EN 60216-5:2003 (not modified).
IEC 60216-6 NOTE Harmonized as EN 60216-6:2004 (not modified).
IEC 60811-1-2 NOTE Harmonized as EN 60811-1-2:1995 (not modified).
__________

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- 3 - EN 60216-4-1:2006
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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
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 60335 (mod) Series Household and similar electrical appliances - EN 60335 Series
Safety


ISO/IEC 17025 2005 General requirements for the competence of EN ISO/IEC 17025 2005
testing and calibration laboratories

---------------------- Page: 4 ----------------------

INTERNATIONAL IEC


STANDARD 60216-4-1





Fourth edition
2006-01


Electrical insulating materials –
Thermal endurance properties –
Part 4-1:
Ageing ovens –
Single-chamber ovens
 IEC 2006  Copyright - all rights reserved
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 publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale Q
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

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– 2 – 60216-4-1  IEC:2006(E)
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Constructional requirements .7
4.1 General .7
4.2 Mechanical requirements.7
4.3 Ventilation .7
4.4 Specimen mounting arrangements .8
4.5 Temperature control and indicator systems .8
5 Performance requirements .8
5.1 Temperature.8
5.2 Temperature difference and temperature fluctuation.9
5.3 Temperature variation .9
5.4 Maximum temperature deviation.9
5.5 Rate of ventilation .9
5.6 Exposure volume.9
5.7 Time constant.10
6 Test methods and procedure .10
6.1 General .10
6.2 Exposure volume.10
6.3 Temperature and related parameters.10
6.4 Rate of ventilation .11
6.5 Time constant.12
7 Report .12
8 Conditions of use and instructions for in-service monitoring by the user .13
8.1 Conditions of use .13
8.2 Procedure .13
8.3 In-service monitoring .13

Annex A (informative) Test method to determine the rate of ventilation .14
Annex B (informative) Examples for calculation of temperature deviation.16

Bibliography.17

Table 1 – Maximum allowable temperature differences and temperature fluctuations.9
Table 2 – Maximum allowable temperature variation .9

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60216-4-1  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 4-1: Ageing ovens –
Single-chamber ovens


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 addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(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. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined 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 Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they 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 and 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 they 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 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 Publication or any other IEC
Publications.
8) 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.
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 Standard IEC 60216-4-1 was prepared by subcommittee 15E: Methods of test, of
IEC technical committee 15: Insulating materials, which has now been merged with IEC
technical committee 98: Electrical insulation systems into IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems (provisional title).
This fourth edition of IEC 60216-4-1 cancels and replaces the third edition, published in 1990,
and constitutes a technical revision.
The main changes with regard to the previous edition is that this edition adapts IEC 60216-4-1
to the technical content and the editorial form of IEC 60216-4-2 and IEC 60216-4-3. In
addition, errors and omissions in the third edition have been corrected.

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– 4 – 60216-4-1  IEC:2006(E)
The text of this standard is based on the following documents:
FDIS Report on voting
112/16/FDIS 112/23/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60216, under the general title Electrical insulating materials – Thermal endurance
properties, is composed of several parts:
Part 1: Ageing procedures and evaluation of test results
Part 2: Determination of thermal endurance properties of electrical insulating materials –
1
Choice of test criteria
Part 3: Instructions for calculating thermal endurance characteristics
Part 4-1: Ageing ovens – Single-chamber ovens
Part 4-2: Ageing ovens – Precision ovens for use up to 300 °C
Part 4-3: Ageing ovens – Multi-chamber ovens
Part 5: Determination of relative thermal endurance index (RTE) of an insulating material
Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material
using the fixed time frame method
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;
• replaced by a revised edition, or
• amended.

A bilingual version of this publication may be issued at a later date.

___________
1
 For revisions and new parts, see the current catalogue of IEC publications for an up-to-date list.

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60216-4-1  IEC:2006(E) – 5 –
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 4-1: Ageing ovens –
Single-chamber ovens



1 Scope
This part of IEC 60216 covers minimum requirements for ventilated and electrically heated
single-chamber ovens, with or without forced gas circulation, for thermal endurance
evaluation of electrical insulation. It covers ovens designed to operate over all or part of the
temperature range from 20 °C above ambient to 500 °C. It gives acceptance tests and in-
service monitoring tests for these ageing ovens.
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 document (including any amendments) applies.
ISO/IEC 17025:2005 General requirements for the competence of testing and calibration
laboratories
IEC 60335 (all parts), Household and similar electrical appliances – Safety
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
rate of ventilation
N
number of air changes per hour in the exposure chamber at room temperature
3.2
exposure volume
that central part of the exposure chamber that meets the requirements for temperature
fluctuation, temperature difference and temperature variation
3.3
exposure temperature
T
temperature selected for ageing test specimens to obtain data for the determination of effects
of temperature
NOTE See also “global exposure temperature”.
3.4
temperature fluctuation
δT
1
maximum change in temperature at one point in the exposure volume over a period of time

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– 6 – 60216-4-1  IEC:2006(E)
3.5
temperature difference
δT
2
maximum difference of temperature between any two points in the exposure volume at any
one time
3.6
temperature variation
δT
v
difference between the highest temperature and the lowest temperature measured in the
exposure volume over a period of time
3.7
global average temperature
average temperature, calculated from the results of determinations made over a period of at
least 3 h using nine sensors spaced throughout the exposure volume of the chamber
3.8
global exposure temperature
considered to be equal to the global average temperature if the sensors are mounted in the
same space as that containing the specimens
NOTE The term ‘global exposure temperature’ is frequently abbreviated to ‘exposure temperature’.
3.9
time constant (of a standard specimen)
measure of time taken for the temperature of a standard specimen to approach the exposure
volume temperature
3.10
temperature deviation
δT
d
calculated difference in the exposure temperature from the intended value due to the
combination of the temperature difference, temperature fluctuation and the error in the
measurement of temperature
NOTE Examples for calculation of temperature deviation are given in Annex B.
3.11
ventilation
continuous passage of pre-heated gas through the exposure chamber
3.12
standard oven
oven which meets the requirements of this standard
3.13
precision oven
oven with an electrically heated and ventilated chamber and with the ability to maintain the
exposure temperature in its exposure volume within the limits given in IEC 60216-4-2
NOTE The limits for temperature difference and temperature fluctuation in the exposure volume given in this
standard are looser than those given in IEC 60216-4-2.
3.14
oven chamber
interior volume of a single chamber oven providing the space for exposing test specimens or
accommodating an iso-box (see 3.15)

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60216-4-1  IEC:2006(E) – 7 –
3.15
iso box
metal box with a close fitting door, mounted in the oven chamber and used as an exposure
chamber to reduce the temperature deviation present in the un-modified oven chamber (see
IEC 60216-4-2)
4 Constructional requirements
4.1 General
The oven shall be soundly constructed of suitable materials designed for continuous operation
over the whole of the allowable temperature range.
All electrical and other ancillary fittings shall be readily accessible for maintenance purposes.
NOTE This standard does not cover all safety aspects. Additional information may be found in the IEC 60335
series.
4.2 Mechanical requirements
The materials of construction of the oven chamber and the interior fittings shall be chosen as
to not influence the properties of the specimens.
NOTE Aluminium alloys and stainless steel have been found suitable in many cases. Copper based alloys and
any materials that may give off interfering volatiles over the temperature range of the oven, for example some
silicone resins, must not be used.
The interior of the oven shall be constructed of suitable corrosion-resistant, non-absorbent
material, so fabricated that any joints are leak-proof and not subject to corrosion. The interior
surfaces shall be easy to clean.
Attention shall be given to ensure that the door to the oven chamber is provided with an
efficient seal and that any gasket materials used do not influence the properties of the
specimens.
4.3 Ventilation
The oven chamber shall be provided with a supply of pre-heated ventilating gas, passing the
chamber at one side and being exhausted through another. Wherever possible, the ventilating
gas shall be directed in such a manner as to produce mixing of the ventilated gas throughout
the chamber.
The rate of ventilation available shall be in accordance with 5.5
Consideration shall be given to ensure adequate purity of the incoming ventilating gas to
minimize influence on the results.
If specified, inlet vents shall enable air and/or other gases to be supplied from controlled
sources.
The construction shall be fitted with equipment to switch off the oven and preferably activate
an alarm when the supply of ventilating gas fails.
NOTE It is recommended that the exhaust from the oven chamber be vented to outside atmosphere, but
precautions should be taken to ensure that volatiles produced by ageing specimens do not damage health or the
environment.

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– 8 – 60216-4-1  IEC:2006(E)
4.4 Specimen mounting arrangements
Provision shall be made for supporting/suspending and positioning specimens within the
exposure volume. The specimens shall neither touch each other nor touch the chamber walls.
The specimens and supports shall not occupy more than 25 % of the cross-sectional area of
the chamber in any one plane, nor occupy more than 10 % of the effective working volume of
the chamber.
NOTE If there is an expectation in practice that any of these maxima could be exceeded, the supplier and
purchaser should agree with the user on whether dummy loads should be used during the assessment of
performance.
4.5 Temperature control and indicator systems
The temperature in the exposure volume shall be controllable to the limits given in Clause 5.
The oven chamber shall be fitted with a minimum of two temperature sensors (numbered 1
and 2). Before installation, the sensors 1 and 2 shall be calibrated by reference to a suitable
standard (sensor 3) to give a maximum measurement uncertainty within ±1,0 K. The
difference in reading between the two sensors as a function of temperature shall be recorded.
Sensor 3 shall have a maximum uncertainty of ±0,5 K.
Temperature sensor 1 shall be mounted in a convenient manner, and used to indicate the
chamber temperature.
NOTE 1 It is recommended that the temperature should be recorded during the whole test procedure. The readout
also allows early identification of any malfunction in the system.
Temperature sensor 2 shall be mounted as closely as possible to where the test specimens
will be located. Its placement shall be well defined and reproducible. It may be removed after
the measurements.
An independent sensor may be used to control the temperature. The placing of that sensor
shall be at the manufacturer's discretion. The control system shall have a drift rate of less
than 2 K/year.
NOTE 2 The sensors may be of any type that meets the requirements (for example liquid-filled thermometer,
resistance thermometer).
NOTE 3 Since the performance of thermocouples is less precise than filled thermometers and resistance systems,
their use is not recommended for the measurement of temperature, although they may be found suitable for the
measurement of temperature difference.
Where liquid-filled thermometers are used, care shall be taken to ensure that the immersion
depth in use is the same as that used during calibration.
The oven shall be equipped with an excess temperature control device which shall be
independent of the main temperature control system. It shall switch off the electrical heaters
in the case where the actual temperature exceeds the intended temperature by a certain pre-
set amount. The system shall also ensure that a warning light or other warning device is
switched on if the excess temperature device operates, and that the heaters are not started
automatically again when the oven temperature has dropped below the set temperature value,
but require a manual start after the warning light has been manually switched off.
5 Performance requirements
5.1 Temperature
It shall be possible to control the temperature of the exposure volume to within the limits of
temperature variation over the full range claimed by the manufacturer.

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60216-4-1  IEC:2006(E) – 9 –
5.2 Temperature difference and temperature fluctuation
The maximum allowable temperature differences and temperature fluctuations over a period
of 3 h shall be as shown in Table 1.
Table 1 – Maximum allowable temperature differences
and temperature fluctuations
Temperature range Maximum allowable temperature
difference and fluctuation
°C
K
2
≤80
>80 to ≤180 2,5
3
>180 to ≤300
>300 to ≤400 4
5
>400 to ≤500

5.3 Temperature variation
The maximum allowable temperature variation is given in Table 2.
Table 2 – Maximum allowable temperature variation
Temperature range Temperature variation
°C K
4
≤80
>80 to ≤180 5
6
>180 to ≤300
>300 to ≤400 8
10
>400 to ≤500

5.4 Maximum temperature deviation
Within the exposure volume, the relevant temperature deviation shall not exceed 1,25 times
the maximum allowable temperature variation within the relevant temperature range.
5.5 Rate of ventilation
Rates in the range 5 to 20 changes per hour shall be made available through the exposure
chamber.
5.6 Exposure volume
The exposure volume shall be sufficient to accommodate the test specimens according to 4.3.
It shall not be less than 50 % of the volume of the oven chamber.
NOTE Experience has shown that an exposure volume of 35 l to 70 l (litres) is generally convenient.

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– 10 – 60216-4-1  IEC:2006(E)
5.7 Time constant
When specified in the purchase contract the time constant shall not exceed a specified value
which shall be agreed between supplier, purchaser and user.
NOTE This parameter is only of importance when the oven is used for short term thermal conditioning (thermal
shock testing).
6 Test methods and procedure
6.1 General
During all measurements of performance, the ambient temperature and the supply voltages to
the oven shall be controlled to within the range stipulated by the manufacturer for the correct
performance of the oven.
6.2 Exposure volume
The size and shape of the exposure volume are determined from the results of a series of
experimental determinations of temperature difference and temperature variation, made using
different placements of a series of temperature sensors at rates of ventilation to be agreed
between supplier and purchase.
NOTE These temperatures might be the minimum and maximum temperatures at which the oven is designed to
operate, and one approximately mid-way between these two, for example 50 °C, 250 °C and 500 °C.
6.3 Temperature and related parameters
6.3.1 Practical aspects
The temperature of the oven chamber and, finally, of the exposure volume shall be
determined using temperature sensor number 2 (see 4.5).
For the determination of temperature difference and temperature fluctuation, place a series of
temperature sensors (maximum time constant 30 s) in the oven chamber under investigation,
ensuring that:
– one sensor is located within 25 mm of the centre of the chamber;
– one additional sensor is located (50 ± 10) mm distance from the walls in each of the eight
corners of the chamber.
The length of wire connecting the temperature sensors to the indicating system shall be
chosen such that the indicated temperature is not inf
...

112/16/FDIS
FINAL DRAFT INTERNATIONAL STANDARD
PROJET FINAL DE NORME INTERNATIONALE
Project number IEC 60216-4-1 Ed.4.0
Numéro de projet
IEC/TC or SC CEI/CE ou SC Secretariat / Secrétariat
112 Germany

Submitted for parallel voting in CENELEC Distributed on / Diffusé le Voting terminates on / Vote clos le
Soumis au vote parallèle au CENELEC
2005-10-14 2005-12-16
Also of interest to the following committees Supersedes document
Intéresse également les comités suivants Remplace le document
   15E/254/CDV - 112/8/RVC
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité CEM Environnement Assurance de la qualité
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
THIS DOCUMENT IS A DRAFT DISTRIBUTED FOR APPROVAL. IT MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED
AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, FINAL
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS
TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.

CE DOCUMENT EST UN PROJET DIFFUSÉ POUR APPROBATION. IL NE PEUT ÊTRE CITÉ COMME NORME INTERNATIONALE AVANT SA PUBLICATION
EN TANT QUE TELLE.
OUTRE LE FAIT D'ÊTRE EXAMINÉS POUR ÉTABLIR S'ILS SONT ACCEPTABLES À DES FINS INDUSTRIELLES, TECHNOLOGIQUES ET COMMERCIALES,
AINSI QUE DU POINT DE VUE DES UTILISATEURS, LES PROJETS FINAUX DE NORMES INTERNATIONALES DOIVENT PARFOIS ÊTRE EXAMINÉS EN
VUE DE LEUR POSSIBILITÉ DE DEVENIR DES NORMES POUVANT SERVIR DE RÉFÉRENCE DANS LES RÈGLEMENTATIONS NATIONALES.

Title
IEC 60216-4-1 Ed.4.0: Electrical insulating materials – thermal endurance properties
– Part 4-1: ageing ovens – Single-chamber ovens

Titre




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Copyright © 2005 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
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writing from IEC.
FORM FDIS (IEC)/FORMULAIRE FDIS (CEI) 2002-08-08

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CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Constructional requirements .7
4.1 General .7
4.2 Mechanical requirements.7
4.3 Ventilation .7
4.4 Specimen mounting arrangements .8
4.5 Temperature control and indicator systems .8
5 Performance requirements .8
5.1 Temperature.8
5.2 Temperature difference and temperature fluctuation.9
5.3 Temperature variation .9
5.4 Maximum temperature deviation.9
5.5 Rate of ventilation .9
5.6 Exposure volume.9
5.7 Time constant.10
6 Test methods and procedure .10
6.1 General .10
6.2 Exposure volume.10
6.3 Temperature and related parameters.10
6.4 Rate of ventilation .11
6.5 Time constant.12
7 Report .12
8 Conditions of use and instructions for in-service monitoring by the user .13
8.1 Conditions of use .13
8.2 Procedure .13
8.3 In-service monitoring .13

Annex A (informative) Test method to determine the rate of ventilation .14
Annex B (informative) Examples for calculation of temperature deviation.16

Bibliography.17

Table 1 – Maximum allowable temperature differences and temperature fluctuations.9
Table 2 – Maximum allowable temperature variation .9

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60216-4-1/FDIS © IEC(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 4-1: Ageing ovens –
Single-chamber ovens


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 addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(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. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined 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 Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they 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 and 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 they 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 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 Publication or any other IEC
Publications.
8) 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.
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 Standard IEC 60216-4-1 was prepared by subcommittee 15E: Methods of test, of
IEC technical committee 15: Insulating materials, which has now been merged with IEC
technical committee 98: Electrical insulation systems into IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems (provisional title).
This fourth edition of IEC 60216-4-1 cancels and replaces the third edition, published in 1990,
and constitutes a technical revision.
The main changes with regard to the previous edition is that this edition adapts IEC 60216-1
to the technical content and the editorial form of IEC 60216-4-2 and IEC 60216-4-3. In
addition, errors and omissions in the third edition have been corrected.

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The text of this standard is based on the following documents:
FDIS Report on voting
112/XX/FDIS 112/XX/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60216, under the general title Electrical insulating materials – Thermal endurance
properties, is composed of several parts:
Part 1: Ageing procedures and evaluation of test results
Part 2: Determination of thermal endurance properties of electrical insulating materials –
1
Choice of test criteria
Part 3: Instructions for calculating thermal endurance characteristics
Part 4-1: Ageing ovens – Single-chamber ovens
Part 4-2: Ageing ovens – Precision ovens for use up to 300 °C
Part 4-3: Ageing ovens – Multi-chamber ovens
Part 5: Determination of relative thermal endurance index (RTE) of an insulating material
Part 6: Determination of thermal endurance indices (TI and RTE) of an insulating material
using the fixed time frame method
The committee has decided that the contents of this publication will remain unchanged until
2
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;
• replaced by a revised edition, or
• amended.

A bilingual version of this publication may be issued at a later date.

———————
1
 For revisions and new parts, see the current catalogue of IEC publications for an up-to-date list.
2
The National Committees are requested to note that for this publication the maintenance result date is 2010.

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60216-4-1/FDIS © IEC(E) – 5 –
ELECTRICAL INSULATING MATERIALS –
THERMAL ENDURANCE PROPERTIES –

Part 4-1: Ageing ovens –
Single-chamber ovens



1 Scope
This part of IEC 60216 covers minimum requirements for ventilated and electrically heated
single-chamber ovens, with or without forced gas circulation, for thermal endurance
evaluation of electrical insulation. It covers ovens designed to operate over all or part of the
temperature range from 20 °C above ambient to 500 °C. It gives acceptance tests and in-
service monitoring tests for these ageing ovens.
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 document (including any amendments) applies.
ISO/IEC 17025:2005 General requirements for the competence of testing and calibration
laboratories
IEC 60335 (all parts), Household and similar electrical appliances – Safety
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
rate of ventilation
N
number of air changes per hour in the exposure chamber at room temperature
3.2
exposure volume
that central part of the exposure chamber that meets the requirements for temperature
fluctuation, temperature difference and temperature variation
3.3
exposure temperature (see also global exposure temperature)
T
temperature selected for ageing test specimens to obtain data for the determination of effects
of temperature
3.4
temperature fluctuation
δT
1
maximum change in temperature at one point in the exposure volume over a period of time

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3.5
temperature difference
δT
2
maximum difference of temperature between any two points in the exposure volume at any
one time
3.6
temperature variation
δT
v
difference between the highest temperature and the lowest temperature measured in the
exposure volume over a period of time
3.7
global average temperature
average temperature, calculated from the results of determinations made over a period of at
least 3 h using nine sensors spaced throughout the exposure volume of the chamber
3.8
global exposure temperature
considered to be equal to the global average temperature if the sensors are mounted in the
same space as that containing the specimens
NOTE The term ‘global exposure temperature’ is frequently abbreviated to ‘exposure temperature’.
3.9
time constant of a standard specimen
measure of time taken for the temperature of a standard specimen to approach the exposure
volume temperature
3.10
temperature deviation
δT
d
calculated difference in the exposure temperature from the intended value due to the
combination of the temperature difference, temperature fluctuation and the error in the
measurement of temperature
3.11
ventilation
continuous passage of pre-heated gas through the exposure chamber
3.12
standard oven
oven which meets the requirements of this standard
3.13
precision oven
oven with an electrically heated and ventilated chamber and with the ability to maintain the
exposure temperature in its exposure volume within the limits given in IEC 60216-4-2
NOTE The limits for temperature difference and temperature fluctuation in the exposure volume given in this
standard are looser than those given in IEC 60216-4-2.
3.14
oven chamber
interior volume of a single chamber oven providing the space for exposing test specimens or
accommodating an iso-box (see 3.15)

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60216-4-1/FDIS © IEC(E) – 7 –
3.15
iso box
metal box with a close fitting door, mounted in the oven chamber and used as an exposure
chamber to reduce the temperature deviation present in the un-modified oven chamber (see
IEC 60216-4-2)
4 Constructional requirements
4.1 General
The oven shall be soundly constructed of suitable materials designed for continuous operation
over the whole of the allowable temperature range.
All electrical and other ancillary fittings shall be readily accessible for maintenance purposes.
NOTE This standard does not cover all safety aspects. Additional information may be found in the IEC 60335
series.
4.2 Mechanical requirements
The materials of construction of the oven chamber and the interior fittings shall be chosen as
to not influence the properties of the specimens.
NOTE Aluminium alloys and stainless steel have been found suitable in many cases. Copper based alloys and
any materials that may give off interfering volatiles over the temperature range of the oven, for example some
silicone resins, must not be used.
The interior of the oven shall be constructed of suitable corrosion-resistant, non-absorbent
material, so fabricated that any joints are leak-proof and not subject to corrosion. The interior
surfaces shall be easy to clean.
Attention shall be given to ensure that the door to the oven chamber is provided with an
efficient seal and that any gasket materials used do not influence the properties of the
specimens.
4.3 Ventilation
The oven chamber shall be provided with a supply of pre-heated ventilating gas, passing the
chamber at one side and being exhausted through another. Wherever possible, the ventilating
gas shall be directed in such a manner as to produce mixing of the ventilated gas throughout
the chamber.
The rate of ventilation available shall be in accordance with 5.5
Consideration shall be given to ensure adequate purity of the incoming ventilating gas to
minimize influence on the results.
If specified, inlet vents shall enable air and/or other gases to be supplied from controlled
sources.
The construction shall be fitted with equipment to switch off the oven and preferably activate
an alarm when the supply of ventilating gas fails.
NOTE It is recommended that the exhaust from the oven chamber be vented to outside atmosphere, but
precautions should be taken to ensure that volatiles produced by ageing specimens do not damage health or the
environment.

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4.4 Specimen mounting arrangements
Provision shall be made for supporting/suspending and positioning specimens within the
exposure volume. The specimens shall neither touch each other nor touch the chamber walls.
The specimens and supports shall not occupy more than 25 % of the cross-sectional area of
the chamber in any one plane, nor occupy more than 10 % of the effective working volume of
the chamber.
NOTE If there is an expectation in practice that any of these maxima could be exceeded, the supplier and
purchaser should agree with the user on whether dummy loads should be used during the assessment of
performance.
4.5 Temperature control and indicator systems
The temperature in the exposure volume shall be controllable to the limits given in Clause 5.
The oven chamber shall be fitted with a minimum of two temperature sensors (numbered 1
and 2). Before installation, the sensors 1 and 2 shall be calibrated by reference to a suitable
standard (sensor 3) to give a maximum measurement uncertainty within ±1,0 K. The
difference in reading between the two sensors as a function of temperature shall be recorded.
Sensor 3 shall have a maximum uncertainty of ±0,5 K.
Temperature sensor 1 shall be mounted in a convenient manner, and used to indicate the
chamber temperature.
NOTE 1 It is recommended that the temperature should be recorded during the whole test procedure. The readout
also allows early identification of any malfunction in the system.
Temperature sensor 2 shall be mounted as closely as possible to where the test specimens
will be located. Its placement shall be well defined and reproducible. It may be removed after
the measurements.
An independent sensor may be used to control the temperature. The placing of that sensor
shall be at the manufacturer's discretion. The control system shall have a drift rate of less
than 2 K/year.
NOTE 2 The sensors may be of any type that meets the requirements (for example liquid-filled thermometer,
resistance thermo
...