IEC 60840:2020/AMD1:2023
(Amendment)Amendment 1 - Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um= 36 kV) up to 150 kV (Um = 170 kV) - Test methods and requirements
Amendment 1 - Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um= 36 kV) up to 150 kV (Um = 170 kV) - Test methods and requirements
Amendement 1 - Câbles d'énergie à isolation extrudée et leurs accessoires pour des tensions assignées supérieures à 30 kV (Um = 36 kV) et jusqu'à 150 kV (Um = 170 kV) - Méthodes et exigences d'essai
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IEC 60840
®
Edition 5.0 2023-06
INTERNATIONAL
STANDARD
AMENDMENT 1
Power cables with extruded insulation and their accessories for rated voltages
above 30 kV (U = 36 kV) up to 150 kV (U = 170 kV) – Test methods and
m m
requirements
IEC 60840:2020-05/AMD1:2023-06(en)
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IEC 60840
®
Edition 5.0 2023-06
INTERNATIONAL
STANDARD
AMENDMENT 1
Power cables with extruded insulation and their accessories for rated voltages
above 30 kV (U = 36 kV) up to 150 kV (U = 170 kV) – Test methods and
m m
requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.20 ISBN 978-2-8322-6985-5
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60840:2020/AMD1:2023
© IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER CABLES WITH EXTRUDED INSULATION AND THEIR
ACCESSORIES FOR RATED VOLTAGES ABOVE 30 KV (U = 36 KV)
m
UP TO 150 KV (U = 170 KV) – TEST METHODS AND REQUIREMENTS
m
AMENDMENT 1
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
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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
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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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60840:2020 has been prepared by IEC technical committee 20: Electric
cables.
The text of this Amendment is based on the following documents:
Draft Report on voting
20/2100/FDIS 20/2107/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
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IEC 60840:2020/AMD1:2023 – 3 –
© IEC 2023
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
2 Normative references
Add the following new references:
IEC 60060-3, High-voltage test techniques – Part 3: Definitions and requirements for on-site
testing
IEC 60137, Insulated bushings for alternating voltages above 1 000 V
IEC 60332-1-3, Tests on electric and optical fibre cables under fire conditions – Part 1-3: Test
for vertical flame propagation for a single insulated wire or cable – Procedure for determination
of flaming droplets/particles
IEC 60754-3, Test on gases evolved during combustion of materials from cables – Part 3:
Measurement of low level of halogen content by ion chromatography
IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltages greater than 1 000 V
3 Terms and definitions
3.2.4
prequalification test
Add "PQ test" as a second preferred term.
3.2.5
extension of prequalification test
Add "EQ test" as a second preferred term.
3.3.2
nominal electrical stress
In the existing Note 2 to entry, delete "Nominal".
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© IEC 2023
3.3.8
joint with screen or metal sheath interruption
Replace the existing entry 3.3.8 with the following new entry 3.3.8:
3.3.8
maximum service pressure
MSP
highest difference between the maximum absolute internal pressure, when the equipment (of
which a composite hollow insulator is a part) is carrying its rated normal current at maximum
operational temperature and the normal outside pressure
Insert, between the existing entry 3.3.9 and entry 3.3.10 the following new entry 3.3.11:
3.3.11
joint with screen or metal sheath interruption
joint, where the metal screen/sheath and insulation screen of the cable are electrically
interrupted
3.3.10
termination with sectionalizing insulation
Replace the existing entry 3.3.10 with the following new entry 3.3.10:
3.3.10
termination with an insulated screen
termination where the metal screen/sheath and insulation screen of the cable are electrically
interrupted to the ground
5 Precautions against water penetration in cables
Replace the existing first paragraph with the following new paragraph:
When cable systems are installed in water or in the ground, in locations with a risk of water
ingress or corrosion, a radial water impermeable barrier is recommended.
6 Cable characteristics
Replace the existing text of list item c), excluding the NOTE, with the following new text:
c) Fire performance: if ST , ST or ST oversheath material is used (see 4.4 and Table 2),
1 2 12
then the subclauses of 12.5.14.3, if any, to which compliance is claimed, shall be declared.
Add, in list item n), after "d is the declared nominal inner diameter of the insulation, in mm;"
ii
the following new text:
U is the value in item b) above in kV;
0
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IEC 60840:2020/AMD1:2023 – 5 –
© IEC 2023
7 Accessories characteristics
7.2 Composite insulators for outdoor cable terminations
Replace Subclause 7.2, including its title, with the following new Subclause 7.2:
7.2 Insulators for outdoor cable terminations
Insulators for outdoor cable terminations shall comply with the requirements given in Table 10
for Level I or II maximum cantilever operating load in service (or MML in the case of composite
insulators). Level I refers to a normal load and shall be generally applied, unless a purchaser
specifies a heavy load of Level II. Alternatively, a different value of maximum cantilever
operating load or MML may be agreed between the purchaser and manufacturer. These tests
are not applicable for cable terminations which are not subjected to cantilever stresses during
operation, e.g. flexible terminations.
7.3 Accessory characteristics to be declared
Integrate the introductory sentence as part of list item a) as follows:
a) The following characteristics shall be declared by the manufacturer: cables used for testing
accessories shall be correctly identified as in Clause 6;
Add, before the first bullet point of list item e), the following two new bullet points:
• design pressure for the outside of the termination insulator (see IEC 62271-209);
• type of insulating gas to be used in the cable connection enclosure (SF6 or details of
alternative gas type).
Add, at the end of the second bullet point of list item f), after "(MSP)", the word "value" and add
the following new list item g):
g) additional requirements for ceramic outdoor termination insulators:
• the maximum cantilever operating load in service;
• for insulators which will be pressurized in service, the design pressure.
8 Test conditions
8.3 Waveform of lightning impulse test voltages
Replace the existing paragraph with the following new paragraph:
The waveforms of lightning impulse tests shall be as given in IEC 60230.
Add, at the end of the existing Subclause 8.5, the following new Subclause 8.6:
8.6 Tests on gas immersed terminations
Electrical tests on gas immersed terminations shall be carried out in a cable connection
enclosure with the diameter specified in IEC 62271-209 for the relevant value of rated voltage.
The gas pressure requirements for electrical type tests given in IEC 62271-209 shall also be
complied with.
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© IEC 2023
9 Routine tests on cables and accessories
9.4 Electrical test on oversheath of the cable
Replace the existing paragraph with the following new paragraph:
Subject to agreement between the purchaser and manufacturer, the cable oversheath shall be
subjected to the electrical test specified in Clause 3 of IEC 60229:2007.
10 Sample tests on cables
10.5 Measurement of electrical resistance of conductor and metal screen
Replace the existing second paragraph with the following new paragraph and bullet points:
The DC resistance of the conductor or metal screen/sheath shall be corrected to a temperature
of 20 °C and a 1 km length of cable in accordance with the formulae and factors given in
IEC 60228:
• for a conductor or metal screen/sheath of copper or aluminium, using the temperature
coefficients given in IEC 60228 or
• for a metal screen/sheath other than copper or aluminium, using the temperature
coefficients given in IEC 60287-1-1.
10.7.2.3 Ring method
Replace the first two sentences of the first paragraph with the following new sentence:
The measurements shall be made with a micrometer having ball noses of radii of approximately
3 mm.
10.12 lightning impulse voltage test
Replace the fifth paragraph beginning with "The lightning impulse voltage…" with the following
two new paragraphs:
The lightning impulse voltage shall be applied, according to the procedure given in IEC 60230,
after the completion of the 2 h heating and while the conductor temperature is within the limits
stated above.
The cable shall withstand, without failure, 10 positive and 10 negative voltage impulses of the
appropriate value given in Table 4, column 8.
10.14 Additional tests on components of cables with a longitudinally applied metal tape
or foil, bonded to the oversheath
Replace the existing title with the following new title:
10.14 Tests on components of cables with a longitudinally applied metal tape or foil
bonded to the oversheath
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IEC 60840:2020/AMD1:2023 – 7 –
© IEC 2023
12 Type tests on cable systems
12.1 General
Delete the existing NOTE 1 and replace the existing NOTE 2 with the following new NOTE:
NOTE Tests on terminations under environmental conditions such as precipitation and/or pollution are not specified
in this document.
12.2 Range of type approval
Replace, in the first paragraph, "conditions of a) to f)" with "conditions of a) to g)".
Add, at the end of list item g), the following new NOTE:
NOTE Clause H.6 gives requirements for approval of a gas immersed termination with an alternative type of gas.
12.3 Summary of type tests
Replace the existing second paragraph with the following new paragraph:
The non-electrical tests on cable components and complete cable are listed in Table 5 to
Table 11, indicating which tests are applicable to each insulation and oversheath compound.
The tests under fire conditions, as listed in Table 11, are only required if the manufacturer
wishes to claim compliance with these tests as a special feature of the design of the cable.
12.4.2 Tests and sequence of tests
Add, at the end of the paragraph in list item b) the following second sentence:
No bending test is required if a different sample is selected.
12.4.3 Bending test
Replace, after list item 4), the definition of the symbol D with the following new definition:
s
D is the nominal diameter of the metal screen layer, in mm.
s
12.4.6 Heating cycle voltage test
Add, at the end of the last paragraph, the following new sentence:
Guidance concerning interruption of the test and the determination of valid heating cycles is
given in Annex K.
12.4.7 Lightning impulse voltage test followed by a power frequency voltage test
Replace the existing second paragraph with the following new paragraph:
The conductor temperature shall be maintained within the stated temperature limits for at least
2 h before the first lightning impulse voltage is applied. The temperature shall be maintained
within the above limits until the test is completed.
Replace the third paragraph with the following two new paragraphs:
If, for practical reasons, the test temperature cannot be reached, additional thermal insulation
may be applied.
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© IEC 2023
The lightning impulse voltage shall be applied, according to the procedure given in IEC 60230,
after the completion of the 2 h heating and, while the conductor temperature is within the limits
stated above.
12.5.5.4 Mechanical tests
Replace "IEC 60811-401" with "IEC 60811-501:2012 and IEC 60811‑501:2012/AMD1:2018".
12.5.8 Test on PVC oversheaths (ST , ST ) and LSHF oversheaths (ST ) at low
1 2 12
temperature
Replace, in the existing title, "Test on…" with "Test for…" as follows:
12.5.8 Test for PVC oversheaths (ST , ST ) and LSHF oversheaths (ST ) at low
1 2 12
temperature
12.5.12 Measurement of density of HDPE insulation
Replace, in the existing title, "…density of…" with "…density for…" as follows:
12.5.12 Measurement of density for HDPE insulation
12.5.13 Measurement of carbon black content of black PE oversheaths (ST and ST )
3 7
Replace, in the existing title, "…content of…" with "…content for…" as follows:
and ST )
12.5.13 Measurement of carbon black content for black PE oversheaths (ST
3 7
12.5.14 Test under fire conditions
Replace the contents of Subclause 12.5.14 with the following new Subclause 12.5.14:
12.5.14 Test under fire conditions
12.5.14.1 General
The tests in 12.5.14.2 shall be carried out on ST (LSHF) oversheath material.
12
The tests in 12.5.14.3 shall be carried out in accordance with the fire performance claimed for
the cable, see Clause 6, item c).
12.5.14.2 Tests on gases evolved during combustion of ST (LSHF) oversheath
12
12.5.14.2.1 Determination of acidity (by pH measurement) and conductivity of gases
evolved during combustion
The test according to IEC 60754-2 shall be carried out on the oversheath of the cable.
The results shall comply with the requirements given in Table 11.
12.5.14.2.2 Measurement of halogen content of gases evolved during combustion
The value for the oversheath, H , of the individual halogen content for each of the four halogens
i
F, Cl, Br, and I, shall be determined by carrying out the test according to IEC 60754-3.
The values for each of the four individual halogens, H , and the sum of the values for the
i
oversheath for the four halogens, i.e. ∑H , shall comply with the requirements given in Table 11.
i
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IEC 60840:2020/AMD1:2023 – 9 –
© IEC 2023
12.5.14.3 Fire performance tests for the cable
12.5.14.3.1 Vertical flame propagation test for single cable
The test under fire conditions in accordance with IEC 60332-1-2 shall be carried out on a sample
of completed cable. During the test, the determination of flaming droplets and particles shall be
carried out in accordance with IEC 60332-1-3.
The results for IEC 60332-1-2 shall comply with the requirements given in Table 11 and the
filter paper (IEC 60332-1-3) shall not ignite during the test duration.
If a failure to meet the requirements of either standard is recorded, two more tests shall be
carried out. If both tests result in passes, the cable shall be deemed to have passed the test.
12.5.14.3.2 Test for vertical flame spread of vertically-mounted cables
The test for vertical flame spread of vertically-mounted cables shall be carried out in accordance
with IEC 60332-3-24, on samples of completed cable. The results shall comply with the
requirements given in Table 11.
NOTE Higher performance to meet the requirements of IEC 60332-3-22 or IEC 60332-3-23 can be agreed between
the purchaser and manufacturer. The fire performance level achieved depends on cable design as well as material
performance.
12.5.14.3.3 Measurement of smoke density of cables burning under defined conditions
The test for measurement of smoke density of cables burning under defined conditions shall be
carried out in accordance with IEC 61034-2 on a sample of completed cable.
The results shall comply with the requirements given in Table 11.
12.5.14.3.4 Determination of acidity (by pH measurement) and conductivity of gases
evolved during combustion of the non-metallic materials in the cable
The test according to IEC 60754-2 shall be carried out on the non-metallic components of the
cable. Non-metallic components with a mass less than or equal to 1 % of the total non-metallic
mass need not be tested.
The weighted values of pH and conductivity of the non-metallic components of the cable shall
be calculated according to IEC 60754-2 and shall comply with the requirements given in
Table 11.
12.5.14.3.5 Measurement of halogen content of gases evolved during combustion of the
non-metallic materials in the cable
'
The weighted value for the cable, H , for the four halogens F, Cl, Br, and I, shall be determined
i
by carrying out the test according to IEC 60754-3 either:
• individually on each non-metallic component of the cable, and calculating the weighted value
for the cable, for each halogen, as described in Annex L,
• or on a sample representative of the cable construction prepared as described in Annex L,
in which case the result for each halogen shall be taken as the weighted value for the cable.
Non-metallic components with a mass less than or equal to 1 % of the total non-metallic mass
need not be tested.
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© IEC 2023
'
The weighted value for the cable, H , for each of the four individual halogens and the sum of
i
the weighted values for the non-metallic components of the cable for the four halogens, i.e.
'
H , shall comply with the requirements given in Table 11.
∑
i
12.5.16 Tests of components of cables with a longitudinally applied metal tape or foil,
bonded to the oversheath
Replace the existing list item b) with the following new item b):
b) adhesion strength of the laminated metal tape or foil (see Clause G.2);
Add, after list item b), the following new item c):
c) peel strength of the laminated metal tape or foil (see Clause G.2).
12.5.17.1 Procedure
Replace the paragraph with the following new paragraph:
The shrinkage test shall be carried out on insulations of PE, HDPE and XLPE using the sampling
and test procedure described in IEC 60811-502:2012, except in the case of 3 core cables where
each of the 3 cores shall be tested to IEC 60811-502:2012 as if they were individual cables
using the conditions specified in Table 8.
12.5.17.2 Requirements
Add, at the end of the existing sentence, the following new sentence:
In the case of 3 core cables the results for each core shall comply.
13 Prequalification test of the cable system
13.1 General and range of prequalification test approval
Replace the contents of Subclause 13.1 with the following:
When a PQ test has been successfully performed on a cable system, it qualifies the
manufacturer as a supplier of cable systems of the same family with the same or lower voltage
ratings, as long as the calculated nominal electrical stresses at the cable insulation screen are
equal to or lower than for the tested cable system.
The PQ test shall be performed on cable systems where the calculated nominal electrical
stresses at the conductor screen are higher than 8,0 kV/mm and/or at the insulation screen
higher than 4,0 kV/mm. The PQ test shall be performed except:
– if cable systems with the same construction and accessories of the same family have been
prequalified for an equal or higher rated voltage;
– or if the manufacturer can demonstrate good service experience with cable systems with
equal or higher calculated electrical stresses on the conductor and insulation screens, in
the main insulation part(s) and in boundaries of the accessories and of accessories of the
same family;
– or if the manufacturer has fulfilled the requirements of an equivalent long-term test on a
cable system at an equal or higher voltage rating with the same construction and
accessories of the same family, following a national or customer specification.
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IEC 60840:2020/AMD1:2023 – 11 –
© IEC 2023
When a prequalified cable system is changed by exchanging a cable and/or accessory with
another one that is already prequalified in another cable system with the same or higher
calculated nominal electrical stresses at the insulation screen of the subjected system, the
current prequalification shall be extended with this cable and/or accessory when the
requirements of 13.3 are all met.
When a prequalified cable system is changed by using another cable and/or accessory that is
not part of a prequalified cable system, or is already prequalified in another cable system with
lower calculated nominal electrical stresses at the insulation screen of the subjected system,
the PQ test on this new complete cable system shall be performed by meeting all the
requirements of 13.2.
The PQ test need only be carried out once unless there is substantial change in the cable
system with respect to material, manufacturing process, design or design electrical stress
levels. A substantial change is defined as that which might adversely affect the performance of
the cable system. The manufacturer should provide a detailed case, including test evidence, if
modifications are introduced, which are claimed not to constitute a substantial change.
It is recommended to carry out a PQ test using a cable of a large conductor cross-section in
order to cover thermo-mechanical aspects.
A list of PQ tests as well as EQ tests is given in Annex C.
A PQ or EQ test certificate signed by the representative of a competent witnessing body, or a
report by the manufacturer giving the test results and signed by the appropriate qualified officer,
or a PQ or EQ test certificate issued by an independent test laboratory shall be acceptable as
evidence of prequalification testing. Such a certificate or report shall include details of the
indoor test arrangement or outdoor installation and shall specify details of laying conditions and
how the cable system was installed.
For a more detailed understanding of the need for a PQ or EQ test, reference should be made
to CIGRE TB 303.
13.2.5 Lightning impulse voltage test
Add, at the end of the first paragraph, the following new sentence:
The temperature shall be maintained within the above limits while the lightning impulse voltages
are applied.
Replace, in the second paragraph, "impulse voltage" with "lightning impulse voltage".
13.3.2.1 General
Replace the second paragraph with the following two new paragraphs:
The minimum total cable length shall be 20 m, not including that inside accessories. The
minimum length of cable between accessories shall be 5 m.
A bending test according to 12.4.3 shall be carried out on the cable, before the installation of
the accessories.
Delete the existing fifth paragraph beginning with "If the cable is part…".
13.3.2.3 Sequence of the electrical part of the extension of prequalification tests
Replace the existing list items a) and b) with the following new items a) and b):
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© IEC 2023
a) installation of the accessories that shall be carried out by the cable or accessory
manufacturer or their representative;
b) partial discharge test at ambient temperature (see 12.4.4) to check the installation and the
quality of the installed accessories;
13.3.2.4 Heating cycle test without voltage
Add, at the end of the last paragraph, the following two new paragraphs:
Heating cycles with a conductor temperature higher than 5 K above the maximum conductor
temperature in normal operation are considered valid.
Interruption of the test is allowed, provided that 60 complete heating cycles in total are
completed. Guidance concerning interruption of the test and the determination of valid heating
cycles is given in Annex K.
14 Type tests on cables
14.3 Summary of tests
Replace the second paragraph with the following new paragraph:
The non-electrical t
...
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