IEC 60252-1:2010

IEC 60252-1 ®
Edition 2.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AC motor capacitors –
Part 1: General – Performance, testing and rating – Safety requirements –
Guidance for installation and operation

Condensateurs des moteurs à courant alternatif –
Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs
assignées – Règles de sécurité – Lignes directrices pour l'installation et
l'utilisation
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IEC 60252-1 ®
Edition 2.0 2010-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AC motor capacitors –
Part 1: General – Performance, testing and rating – Safety requirements –
Guidance for installation and operation

Condensateurs des moteurs à courant alternatif –
Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs
assignées – Règles de sécurité – Lignes directrices pour l'installation et
l'utilisation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 31.060.30; 31.060.70 ISBN 978-2-88912-189-2
– 2 – 60252-1 © IEC:2010
CONTENTS
FOREWORD.4
1 Scope and object.6
2 Normative references .6
3 Terms and definitions .7
4 Service conditions .10
4.1 Normal service conditions .10
4.2 Preferred tolerances on capacitance .10
5 Quality requirements and tests .10
5.1 Test requirements .10
5.1.1 General .10
5.1.2 Test conditions .10
5.2 Nature of tests.11
5.2.1 Type tests .11
5.2.2 Routine tests .11
5.3 Type tests .11
5.3.1 Test procedure .11
5.3.2 Extent of qualification .11
5.4 Routine tests .14
5.4.1 Test procedure .14
5.5 Tangent of loss angle .14
5.6 Visual examination .14
5.7 Voltage test between terminals.14
5.8 Voltage test between terminals and case.15
5.9 Capacitance measurement .15
5.10 Check of dimensions .15
5.11 Mechanical tests .15
5.11.1 Robustness of terminations .16
5.11.2 Soldering.16
5.11.3 Vibration.17
5.11.4 Fixing bolt or stud (if fitted).17
5.12 Sealing test .17
5.13 Endurance test .18
5.13.1 Testing in air with forced circulation.18
5.13.2 Endurance test procedure.18
5.13.3 Conditions of compliance.19
5.14 Damp-heat test.19
5.15 Self-healing test .19
5.16 Destruction test .20
5.16.1 Test specimens .20
5.16.2 Test apparatus .20
5.16.3 Test procedure .22
5.16.4 Evaluation of the failure.23
5.17 Resistance to heat, fire and tracking .23
5.17.1 Ball-pressure test .23
5.17.2 Glow-wire test .23
5.17.3 Tracking test.24

60252-1 © IEC:2010 – 3 –
6 Permissible overloads .24
6.1 Maximum permissible voltage.24
6.2 Maximum permissible current .24
6.3 Maximum permissible reactive output .24
7 Safety requirements .24
7.1 Creepage distances and clearances .24
7.2 Terminals and connecting cables .25
7.3 Earth connections .25
7.4 Discharge devices .26
8 Marking .26
9 Guidance for installation and operation.26
9.1 General .26
9.2 Choice of rated voltage .27
9.2.1 Measurements of working voltage.27
9.2.2 Influence of capacitance.27
9.3 Checking capacitor temperature .27
9.3.1 Choice of maximum permissible capacitor operating temperature .27
9.3.2 Choice of minimum permissible capacitor operating temperature.27
9.4 Checking transients.27
9.5 Leakage current .28
Annex A (normative) Test voltage .29
Bibliography.30

Figure 1 – Test apparatus for d.c. conditioning .21
Figure 2 – Test apparatus for a.c. destruction test .21
Figure 3 – Arrangement to produce the variable inductor L in Figure 2.22

Table 1 – Type test schedule .13
Table 2a – Test voltages.14
Table 2b – Test voltages.14
Table 3 – Torque .16
Table 4 – Endurance test conditions .19
Table 5 – Minimum creepage distances and clearances.25

– 4 – 60252-1 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AC MOTOR CAPACITORS –
Part 1: General – Performance, testing and rating –
Safety requirements –
Guidance for installation and operation

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60252-1 has been prepared by IEC technical committee 33: Power
capacitors and their applications.
This second edition cancels and replaces the first edition of IEC 60252-1 published in 2001
and constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– the definition of “segmented capacitors” has been added, in 3.6;
– the definition of “classes of operation “ has been clarified, with the addition of the
concept of “probable life” with reference to statistics, in 3.9;
– the following wording “Operation above the rated voltage will reduce the life
expectancy of the capacitor” has been introduced in 6.1;

60252-1 © IEC:2010 – 5 –
– some clarifications have been added to Clause 8, Marking, mainly for small capacitors.
The text of this standard is based on the following documents:
FDIS Report on voting
33/470/FDIS 33/473/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.
A list of all parts of IEC 60252 series, under the general title AC motor capacitors can be
found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.
– 6 – 60252-1 © IEC:2010
AC MOTOR CAPACITORS –
Part 1: General – Performance, testing and rating –
Safety requirements –
Guidance for installation and operation

1 Scope and object
This part of IEC 60252 applies to motor capacitors intended for connection to windings of
asynchronous motors supplied from a single-phase system having a frequency up to and
including 100 Hz, and to capacitors to be connected to three-phase asynchronous motors so
that these motors may be supplied from a single-phase system.
This standard covers impregnated or unimpregnated capacitors having a dielectric of paper,
plastic film, or a combination of both, either metallized or with metal-foil electrodes, with rated
voltages up to and including 660 V.
Motor start capacitors are covered by IEC 60252-2.
NOTE The following are excluded from this standard:
– shunt capacitors of the self-healing type for a.c. power systems of up to and including 1 000 V nominal voltage
(see IEC 60831-1);
– shunt capacitors of non-self-healing type for a.c. power systems of up to and including 1 000 V nominal voltage
(see IEC 60931-1);
– shunt capacitors for a.c. power systems having a nominal voltage above 1 000 V (see IEC 60871-1);
– capacitors for induction heat-generating plants, operating at frequencies between 40 Hz and 24 000 Hz (see
IEC 60110-1);
– series capacitors (see IEC 60143);
– coupling capacitors and capacitor dividers (see IEC 60358);
– capacitors to be used in power electronic circuits (see IEC 61071);
– small a.c. capacitors to be used for fluorescent and discharge lamps (see IEC 61048);
– capacitors for suppression of radio interference (IEC publication under consideration);
– capacitors intended to be used in various types of electrical equipment and thus considered as components;
– capacitors intended for use with d.c. voltage superimposed on a.c. voltage.
The object of this standard is
a) to formulate uniform rules regarding performance, testing and rating;
b) to formulate specific safety rules;
c) to provide a guidance for installation and operation.
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.
IEC 60062, Marking codes for resistors and capacitors
IEC 60068 (all parts), Environmental testing
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

60252-1 © IEC:2010 – 7 –
IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for
solderability and resistance to soldering heat of devices with leads
IEC 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of
terminations and integral mounting devices
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady
state
IEC 60112, Method for the determination of the proof and the comparative tracking indices of
solid insulating materials
IEC 60309-1, Plugs, socket-outlets and couplers for industrial purposes – Part 1: General
requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
IEC 60695-2-11,Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods - Glow-
wire flammability test method for end products
ISO 4046, Paper, board, pulps and related terms – Vocabulary
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
motor running capacitor
a power capacitor which, when used in conjunction with an auxiliary winding of a motor,
assists the motor to start and improves the torque under running conditions
NOTE The running capacitor is usually connected permanently to the motor winding and remains in circuit
throughout the running period of the motor. During the starting period, if it is in parallel with the starting capacitor,
it helps to start the motor.
3.2
motor starting capacitor
a power capacitor which provides a leading current to an auxiliary winding of a motor and
which is switched out of circuit once the motor is running
3.3
metal foil capacitor
a capacitor, the electrodes of which consist of metal foils or strips separated by a dielectric
3.4
metallized capacitor
a capacitor, in which the electrodes consist of a metallic deposit on the dielectric
3.5
self-healing capacitor
a capacitor, the electrical properties of which, after local breakdown of the dielectric, are
rapidly and essentially self-restored

– 8 – 60252-1 © IEC:2010
3.6
segmented film capacitor
a metallised capacitor with a repeating pattern on the metallic deposit on at least one layer,
designed to isolate sections of the capacitor in the event of localised faults occurring in the
dielectric
3.7
discharge device of a capacitor
a device which may be incorporated in a capacitor, capable of reducing the voltage between
the terminals effectively to zero, within a given time, after the capacitor has been
disconnected from a network
3.8
continuous operation
operation with no time limit within the normal life of the capacitor
3.9
class of operation
the minimum probable total life for which the capacitor has been designed at rated duty,
voltage, temperature and frequency
NOTE 1 Four classes have been foreseen
Class A – 30 000 h
Class B – 10 000 h
Class C – 3 000 h
Class D – 1 000 h
These classes of operation are intended to represent a probable failure rate not exceeding 3 % during the life of
the product.
Failures considered are: short-circuits, interruptions, leakage of liquid, capacitance drifts exceeding 10 % out of the
rated tolerance limits
A capacitor may have more than one class with corresponding voltages.
NOTE 2 Classes of operation have a statistical value (the “law of big numbers”): it is not possible to transfer
automatically data coming from a limited quantity to a whole population or even to a batch of capacitors. The
purchaser and the manufacturer should agree upon to confront the case of a true failure rate larger than 3 %.
3.10
minimum permissible capacitor operating temperature
minimum permissible temperature on the outside of the case at the moment of switching on
the capacitor
3.11
maximum permissible capacitor operating temperature
t
c
maximum permissible temperature of the hottest area of the outside of the capacitor case
during operation
3.12
rated voltage of a capacitor
U
N
r.m.s. value of the alternating voltage for which the capacitor has been designed
3.13
rated frequency of a capacitor
f
N
highest frequency for which the capacitor has been designed

60252-1 © IEC:2010 – 9 –
3.14
rated capacitance of a capacitor
C
N
capacitance value for which the capacitor has been designed
3.15
rated current of a capacitor
I
N
r.m.s. value of the alternating current at the rated voltage and frequency for which the
capacitor has been designed
3.16
rated output of a capacitor
Q
N
reactive power derived from the rated values of capacitance, frequency and voltage
(or current)
3.17
capacitor losses
active power dissipated by a capacitor
NOTE Unless otherwise stated, the capacitor losses will be understood to include losses in fuses and discharge
resistors forming an integral part of the capacitor.
3.18
tangent of loss angle (tan delta) of a capacitor
ratio between the equivalent series resistance and the capacitive reactance of a capacitor at
specified sinusoidal alternating voltage and frequency
3.19
capacitive leakage current (only for capacitors with a metal case)
current flowing through a conductor connecting the metallic case to earth, when the capacitor
is energized from an a.c. supply system with an earthed neutral
3.20
type of capacitor
capacitors are considered to be of the same type when of similar constructional form, the
same constructional technology, same rated voltage, same climatic category and same kind of
operation. Capacitors of the same type can differ only in rated capacitance and size. Minor
differences between terminations and mounting devices are permitted
NOTE The same construction includes, for example, the same dielectric material, dielectric thickness and type of
case (metal or plastic).
3.21
model of capacitor
capacitors are considered to be of the same model when they are of the same construction
and have the same functional and dimensional characteristics within the tolerance limits and
are consequently interchangeable
3.22
class of safety protection
degree of safety protection identified by one of three codes to be marked on the capacitor
(P2) indicates that the capacitor type has been designed to fail in the open-circuit mode
only and is protected against fire or shock hazard. Compliance is verified by the test
described in 5.16.
– 10 – 60252-1 © IEC:2010
(P1) indicates that the capacitor type may fail in the open-circuit or short-circuit mode and
is protected against fire or shock hazard. Compliance is verified by the test described
in 5.16.
(P0) indicates that the capacitor type has no specific failure protection
4 Service conditions
4.1 Normal service conditions
This standard gives requirements for capacitors intended for use under the following
conditions:
a) altitude: not exceeding 2 000 m;
b) residual voltage at energization: shall not exceed 10 % rated voltage (see 7.4, note);
c) pollution: capacitors included in the scope of this standard are designed for operation in
lightly polluted atmospheres;
NOTE The IEC has not yet established a definition for "lightly polluted". When this definition is established by
the IEC, it will be incorporated in this standard.
d) operating temperature: between –40 °C and +100 °C (see 3.10 and 3.11).
The preferred minimum and maximum permissible capacitor operating temperatures are
as follows:
– minimum temperatures: –40 °C, –25 °C, –10 °C and 0 °C;
– maximum temperatures: 55 °C, 70 °C, 85 °C and 100 °C.
Capacitors shall be suitable for transport and storage at temperatures down to –25 °C, or
the minimum operating temperature, whichever is the lower, without adverse effect on
their quality;
e) damp heat severity: between 4 days and 56 days. The preferred severity is 21 days.
(The damp heat severity shall be selected from the values indicated by IEC 60068-2-78,
i.e.: 4 days, 10 days, 21 days and 56 days.)
Capacitors are classified in climatic categories defined by the minimum and maximum
permissible capacitor operating temperatures and damp heat severity; i.e. 10/70/21
indicates that the minimum and the maximum permissible capacitor operating
temperatures are –10 °C and 70 °C and the damp heat severity is 21 days.
4.2 Preferred tolerances on capacitance
Preferred tolerances are as follows: ±5 %, ±10 % and ±15 %.
Asymmetric tolerances are permitted but no tolerance shall exceed 15 %.
5 Quality requirements and tests
5.1 Test requirements
5.1.1 General
This clause gives the test requirements for capacitors.
5.1.2 Test conditions
Unless otherwise specified for a particular test or measurement, the temperature of the
capacitor dielectric shall be in the range +15 °C to +35 °C and shall be recorded.
If corrections are necessary, the reference temperature shall be +20 °C.

60252-1 © IEC:2010 – 11 –
NOTE It may be assumed that the dielectric temperature is the same as the ambient temperature, provided that
the capacitor has been left in an unenergized state at this ambient temperature for an adequate period, depending
on the size of the capacitor.
5.2 Nature of tests
The tests specified are of two sorts:
a) type tests;
b) routine tests.
5.2.1 Type tests
Type tests are intended to prove the soundness of the design of the capacitor and its
suitability for operation under the conditions detailed in this standard.
Type tests are carried out by the manufacturer and/or the test authority if there is need for an
approval.
These tests may be carried out under the supervision of a proper authority which will issue a
certified record and/or type approval.
5.2.2 Routine tests
Routine tests shall be carried out by the manufacturer on every capacitor before delivery. If
the purchaser so requests, he shall be supplied with a certificate stating that routine tests
have been carried out.
5.3 Type tests
5.3.1 Test procedure
The samples of each model selected for the type tests shall be divided into groups, as
indicated in Table 1.
Capacitors forming the sample shall have successfully passed the routine tests indicated in 5.4.1.
Each test group shall contain equal numbers of capacitors of the highest capacitance and the
lowest capacitance in the range.
The manufacturer shall provide data on the ratio of capacitance per outer total surface area of
the case of each capacitance value in the range.
The capacitor with the maximum capacitance per unit surface area shall also be tested if this
ratio exceeds that of the maximum capacitance value in the range by 10 % or more.
Similarly, the capacitor with the minimum capacitance per unit area shall also be tested if the
ratio is less than that of the minimum capacitance value in the range by 10 % or more.
"Area" denotes total outer surface area of the capacitor case with the exception of small
protrusions, terminals and fixing studs.
5.3.2 Extent of qualification
5.3.2.1 A type test on a single model qualifies only the model tested. When the type test is
performed on two models of the same type, and of different rated capacitance value, selected
under the rules of 5.3.1, the qualification is valid for all models of the same type having rated
capacitance between the two tested values.

– 12 – 60252-1 © IEC:2010
5.3.2.2 The qualification tests carried out successfully on a capacitor model having a certain
capacitance tolerance are valid also for capacitors of the same model but having a different
capacitance tolerance of up to twice the limits of the declared tolerance. For example, ±5 %
would cover up to ±10 %, and ±10 % would cover up to ±20 %. A smaller tolerance than the
declared tolerance is not permitted. For example, a type approval for ±10 % would not cover
±5 %.
5.3.2.3 Occasionally, in current practice, capacitors are required with a capacitance
tolerance that is not symmetrical with respect to the rated capacitance value.
When a type test is carried out successfully on a capacitor model having a symmetrical
capacitance tolerance, the relevant qualification is valid also for capacitors of the same model
having a non-symmetrical capacitance provided that the total range of non-symmetrical
tolerance is
a) within the total range of capacitance allowed in 5.3.2.2,
and
b) greater than, or equal to, that of the tested capacitor model. For example, qualification for
+5 +10
+10 +8 +15
±5 would allow values such as %, %, %, %, but not %.
−5
−5 −10 −2 0
60252-1 © IEC:2010 – 13 –
Table 1 – Type test schedule
Number
Number
Number
of failures
of failures
of samples allowed in
allowed
Group Tests Subclause
to be inspected first test
in retest
(note 1)
(note 2)
Visual examination 5.6
Check markings 8
Check of dimensions 5.10
1 Mechanical tests 5.11 8 [4] 1 0
(excluding soldering) (note 3)
Sealing tests 5.12
(if applicable)
2 Endurance test 5.13 42 [21] 2 0
(note 4)
Soldering (if applicable) 5.11.2
Damp heat test 5.14
3 Voltage test between terminals 5.7 12 [6] 1 0
(note 3)
Voltage test between terminals 5.8
and case
4 Self-healing test 5.15 20 [10] 1 0
(if applicable) (note 3)
5 Destruction test 5.16 20 [10] 1 0
(if marked on the capacitor) 10 [5] (note 5)
6 Resistance to heat, fire and 5.17 3 0 0
tracking (not applicable to (Terminal
capacitors with lead terminations) housing only)
(see note 6)
NOTE 1 The number of samples specified allows for retest if required. The number in square brackets indicates
the actual number required for the test. All numbers indicate the sample quantity for each capacitance value
tested. If a range is tested, then the quantity indicated in this table will apply to both the highest capacitance and
the lowest capacitance and to any other intermediate value required to be tested in the range according to 5.3.1.
NOTE 2 A capacitor which fails on more than one test is counted as one defective capacitor.
NOTE 3 For groups 1, 3 and 4, a retest is allowed with 1 failure. No failures are allowed in these retests.
NOTE 4 For group 2, no retest is required with 0 or 1 failure. With two failures, a retest is required with no failure
allowed in this retest.
NOTE 5 For group 5, see 5.16 which allows a retest under special conditions in the event of one failure.
NOTE 6 Three samples of terminal housing (parts of insulating material retaining terminals in position) are
needed for the tests described on 5.17
One sample is required for the ball-pressure test (5.17.1) one for the glow-wire test (5.17.2) and one for the
tracking test (5.17.3).
When the number of defects for each group and the total number of defective capacitors do
not exceed the figures indicated in Table 1, the capacitor model shall be deemed to comply
with this standard.
When a capacitor is designed to operate under two or more different conditions (rated
voltages, classes, rated duty cycles, etc.), the following tests shall be performed, once only,
at the highest test voltage:
a) voltage test between terminals (see 5.7);
b) voltage test between terminals and case (see 5.8);
c) self-healing test (see 5.15).

– 14 – 60252-1 © IEC:2010
The endurance test shall be performed for every voltage rating and under every operating
condition marked on the capacitor. The number of samples to be inspected shall be calculated
accordingly.
5.4 Routine tests
5.4.1 Test procedure
Capacitors shall be subjected to the following tests in the stated order:
a) sealing test, if applicable (see 5.12);
b) voltage test between terminals (see 5.7);
c) voltage test between terminals and case (see 5.8);
d) visual examination (see 5.6);
e) capacitance measurement (see 5.9);
f) tangent of loss angle (see 5.5).
5.5 Tangent of loss angle
The tangent of loss angle limit and measuring frequency shall be defined by the manufacturer.
5.6 Visual examination
The condition, workmanship, marking and finish shall be satisfactory. The marking shall be
legible during the life of the capacitor.
5.7 Voltage test between terminals
In type tests, capacitors shall be subjected to an a.c. voltage test as specified in Table 2a or
Table 2b. The test shall be carried out with a substantially sinusoidal voltage at the rated
frequency. The test may be carried out at 50 Hz or 60 Hz.
A higher frequency may be used at the manufacturer's discretion.
IMPORTANT NOTE
All European countries and countries not specifically named below require tests to be carried out in accordance
with Table 2a.
Canada, Japan and USA require that tests are carried out in accordance with Table 2b.
Table 2a – Test voltages
Type test time
Ratio of test voltage
Type of operation Type of capacitor
to rated voltage a.c.
s
Continuous Non-self-healing capacitor 2,15 60
Self-healing capacitor 2,0 60
For routine tests, the test time in Table 2a may be reduced from 60 s to 2 s.
Table 2b – Test voltages
Type test time
Ratio of test voltage
Type of operation Type of capacitor
to rated voltage a.c.
s
Continuous Non-self-healing capacitor 2,15 10
Self-healing capacitor 1,75 10

60252-1 © IEC:2010 – 15 –
For routine tests, the test time in Table 2b may be reduced from 10 s to 1 s.
No flashover or permanent breakdown shall occur. For metallized capacitors, self-healing may
occur.
When the capacitor comprises more than one section, each section shall be tested
independently in accordance with the above table.
5.8 Voltage test between terminals and case
Capacitors shall be capable of withstanding without breakdown, for 60 s, a test between
terminals (joined together) and the case, with a substantially sinusoidal a.c. voltage of a
frequency as near as possible to the rated frequency and of the following r.m.s. value:
twice the rated voltage +1 000 V but not less than 2 000 V.
If the capacitor case is of insulating material, in type tests the test voltage shall be applied
between the terminals and the metal mountings, if any, or between the terminals and a metal
foil wrapped tightly round the surface of the case. In routine tests the test voltage shall be
applied between the terminals and a metal part, if any.
No routine test is required if the case is made entirely of insulating material.
During the test, no dielectric breakdown or flashover shall occur.
For routine tests, the duration may be reduced from 60 s to 2 s for countries using Table 2a or
1 s for countries using Table 2b.
5.9 Capacitance measurement
The capacitance shall be measured using a method which excludes errors due to harmonics.
The precision of measurement shall be better than 5 % of the total tolerance band. For type
tests the absolute precision shall be 0,2 % maximum.
Type and routine testing shall be carried out at between 0,9 and 1,1 times the rated voltage
and at the rated frequency.
Other measuring voltages and frequencies are permitted if it can be demonstrated that the
capacitance measured does not deviate from the true value by more than 0,2 %.
5.10 Check of dimensions
Dimensions of the case, of the terminals and of the fixing arrangements shall comply with
those indicated in the drawing, taking tolerances into account.
In addition, minimum creepage distances and clearances indicated in Table 5 shall be
checked.
5.11 Mechanical tests
These tests shall be carried out in conformity with the relevant test in IEC 60068 series.
These tests are as follows:
– robustness of terminations: Test U, IEC 60068-2-21;
– soldering: Test T, IEC 60068-2-20;

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– vibration (sinusoidal): Test Fc, IEC 60068-2-6.
5.11.1 Robustness of terminations
The capacitor shall be subjected to tests Ua, Ub, Uc and Ud of IEC 60068-2-21, as
applicable.
5.11.1.1 Test Ua – Tensile
The load to be applied shall be 20 N for all types of terminations.
For external wire terminations, the cross-sectional area shall be at least 0,5 mm .
5.11.1.2 Test Ub – Bending (half of the terminations)
This test shall be carried out only on wire terminations. Two consecutive bends shall be
applied.
5.11.1.3 Test Uc – Torsion (other half of the terminations)
This test shall be carried out only on wire terminations. Two successive rotations of 180° shall
be applied.
5.11.1.4 Test Ud – Torque (screw terminals)
This test shall be carried out on threaded terminations.
The nuts or screws shall be tightened to the torque specified in Table 3 and loosened again.
The torque shall be applied gradually. The screw material shall have adequate resistance
against stress cracking.
Table 3 – Torque
Thread diameter Torque
N · m
mm
2,6 0,4
3,0 0,5
3,5 0,8
4,0 1,2
5,0 1,8
5,5 2,2
6,0 2,5
8 5
10 7
12 12
5.11.1.5 Visual examination
After each of these tests the capacitors shall be visually examined. There shall be no visible
damage.
5.11.2 Soldering
This test shall be carried out only when terminals are designed for connection by soldering.
The capacitor shall then be subjected to test T of IEC 60068-2-20 either using the solder bath
method or the solder globule method.

60252-1 © IEC:2010 – 17 –
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