Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) – Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV)

IEC 60502-2:2014 is available as IEC 60502-2:2014 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60502-2:2014 specifies the construction, dimensions and test requirements of power cables with extruded solid insulation from 6 kV up to 30 kV for fixed installations such as distribution networks or industrial installations. When determining applications, it is recommended that the possible risk of radial water ingress is considered. Cable designs with barriers claimed to prevent longitudinal water penetration and an associated test are included in this part of IEC 60502. Cables for special installation and service conditions are not included, for example cables for overhead networks, the mining industry, nuclear power plants (in and around the containment area) nor for submarine use or shipboard application. This third edition cancels and replaces the second edition, published in 2005, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) a simplified calculation procedure for the thickness of the lead sheath and the oversheath;
b) a new subclause for the determination of the cable conductor temperature;
c) a modified procedure for the routine voltage test;
d) a new subclause for a routine electrical test on oversheath;
e) modified requirements for the non-metal sheaths including semi-conductive layer;
f) modified tolerances for the bending test cylinder;
g) the inclusion of a 0,1 Hz test after installation.
In addition, the modified structure of the IEC 60811 series has been adopted for this third edition.

Câbles d'énergie à isolant extrudé et leurs accessoires pour des tensions assignées de 1 kV (Um = 1,2 kV) à 30 kV (Um = 36 kV) – Partie 2: Câbles de tensions assignées de 6 kV(Um = 7,2 kV) à 30 kV (Um = 36 kV)

IEC 60502-2:2014 est disponible sous forme de IEC 60502-2:2014 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
IEC 60502-2:2014 spécifie la constitution, les dimensions et les exigences d'essais des câbles d'énergie à isolation extrudée par diélectriques massifs, de tensions assignées de 6 kV à 30 kV, pour installations fixes telles que les réseaux de distribution ou les installations industrielles. Pour la conception des câbles, il est recommandé de tenir compte du risque possible d'une entrée d'eau radiale. Les câbles dont la conception est déclarée comporter une barrière d'étanchéité longitudinale à l'eau et les essais qui y correspondent sont inclus dans cette partie de la CEI 60502. Les câbles destinés à des conditions particulières d'installations et de service ne sont pas inclus, par exemple, les câbles pour réseaux aériens, pour l'industrie minière, pour les centrales nucléaires (à l'intérieur et à l'extérieur de l'enceinte de confinement), les câbles sous-marins ou les câbles de bord des navires. Cette troisième édition annule et remplace la deuxième édition publiée en 2005 et constitue une révision technique. Des changements techniques significatifs ont été apportés par rapport à la deuxième édition:
a) une procédure de calcul simplifié pour l'épaisseur de la gaine de plomb et de la gaine extérieure;
b) un nouveau paragraphe concernant la détermination de la température de l'âme du câble;
c) une procédure modifiée des essais individuels de tension;
d) un nouveau paragraphe concernant l'essai individuel électrique de la gaine extérieure;
e) les exigences modifiées pour les gaines non métalliques y compris une couche semi-conductrice;
f) les tolérances modifiées concernant l'essai d'enroulement d'un cylindre d'essai;
g) l'ajout d'un essai sous 0,1 Hz après l'installation.
De plus, la structure modifiée de la série CEI 60811 est adoptée dans cette troisième édition.

Elektroenergetski kabli z ekstrudirano izolacijo in njihov pribor za naznačene napetosti od 1 kV (Um = 1,2 kV) do 30 kV (Um = 36 kV) - 2. del: Kabli za naznačene napetosti od 6 kV (Um = 7,2 kV) do 30 kV (Um = 36 kV)

General Information

Status
Published
Publication Date
18-Sep-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Sep-2022
Due Date
21-Nov-2022
Completion Date
19-Sep-2022

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IEC 60502-2:2014 - Power cables with extruded insulation and their accessories for rated voltages from 1 kV (<i>U</i><sub>m</sub> = 1,2 kV) up to 30 kV (<i>U</i><sub>m</sub> = 36 kV) - Part 2: Cables for rated voltages from 6 kV (<i>U</i><sub>m</sub> = 7,2 kV) up to 30 kV (<i>U</i><sub>m</sub> = 36 kV)
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SLOVENSKI STANDARD
SIST IEC 60502-2:2022
01-oktober-2022
Elektroenergetski kabli z ekstrudirano izolacijo in njihov pribor za naznačene

napetosti od 1 kV (Um = 1,2 kV) do 30 kV (Um = 36 kV) - 2. del: Kabli za naznačene

napetosti od 6 kV (Um = 7,2 kV) do 30 kV (Um = 36 kV)

Power cables with extruded insulation and their accessories for rated voltages from 1 kV

(Um = 1,2 kV) up to 30 kV (Um = 36 kV) – Part 2: Cables for rated voltages from 6 kV

(Um = 7,2 kV) up to 30 kV (Um = 36 kV)

Câbles d'énergie à isolant extrudé et leurs accessoires pour des tensions assignées de 1

kV (Um = 1,2 kV) à 30 kV (Um = 36 kV) – Partie 2: Câbles de tensions assignées de 6

kV(Um = 7,2 kV) à 30 kV (Um = 36 kV)
Ta slovenski standard je istoveten z: IEC 60502-2:2014
ICS:
29.060.20 Kabli Cables
SIST IEC 60502-2:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST IEC 60502-2:2022
---------------------- Page: 2 ----------------------
SIST IEC 60502-2:2022
IEC 60502-2
Edition 3.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) –
Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to
30 kV (Um = 36 kV)
Câbles d'énergie à isolant extrudé et leurs accessoires pour des tensions
assignées de 1 kV (Um = 1,2 kV) à 30 kV (Um = 36 kV) –
Partie 2: Câbles de tensions assignées de 6 kV(Um = 7,2 kV) à
30 kV (Um = 36 kV)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 29.060.20 ISBN 978-2-8322-1409-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
SIST IEC 60502-2:2022
– 2 – 60502-2 © IEC:2014
CONTENTS

FOREWORD ......................................................................................................................... 10

1 Scope ............................................................................................................................ 12

2 Normative references ..................................................................................................... 12

3 Terms and definitions .................................................................................................... 14

3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) ................ 14

3.2 Definitions concerning the tests ........................................................................ 14

4 Voltage designations and materials ................................................................................ 15

4.1 Rated voltages ................................................................................................. 15

4.2 Insulating compounds....................................................................................... 16

4.3 Sheathing compounds ...................................................................................... 17

5 Conductors .................................................................................................................... 17

6 Insulation ....................................................................................................................... 17

6.1 Material ............................................................................................................ 17

6.2 Insulation thickness .......................................................................................... 17

7 Screening ...................................................................................................................... 19

7.1 General ............................................................................................................ 19

7.2 Conductor screen ............................................................................................. 19

7.3 Insulation screen .............................................................................................. 19

8 Assembly of three-core cables, inner coverings and fillers .............................................. 19

8.1 General ............................................................................................................ 19

8.2 Inner coverings and fillers ................................................................................ 19

8.2.1 Construction ................................................................................... 19

8.2.2 Material .......................................................................................... 20

8.2.3 Thickness of extruded inner covering .............................................. 20

8.2.4 Thickness of lapped inner covering ................................................. 20

8.3 Cables having a collective metal layer (see Clause 9) ....................................... 20

8.4 Cables having a metal layer over each individual core (see Clause 10) ............ 20

9 Metal layers for single-core and three-core cables .......................................................... 21

10 Metal screen .................................................................................................................. 21

10.1 Construction ..................................................................................................... 21

10.2 Requirements ................................................................................................... 21

10.3 Metal screens not associated with semi-conducting layers ................................ 21

11 Concentric conductor ..................................................................................................... 21

11.1 Construction ..................................................................................................... 21

11.2 Requirements ................................................................................................... 21

11.3 Application ....................................................................................................... 22

12 Metal sheath .................................................................................................................. 22

12.1 Lead sheath ..................................................................................................... 22

12.2 Other metal sheaths ......................................................................................... 22

13 Metal armour ................................................................................................................. 22

13.1 Types of metal armour ..................................................................................... 22

13.2 Materials .......................................................................................................... 22

13.3 Application of armour ....................................................................................... 23

13.3.1 Single-core cables .......................................................................... 23

13.3.2 Three-core cables ........................................................................... 23

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SIST IEC 60502-2:2022
60502-2 © IEC:2014 – 3 –

13.3.3 Separation sheath ........................................................................... 23

13.3.4 Lapped bedding under armour for lead sheathed cables .................. 23

13.4 Dimensions of the armour wires and armour tapes............................................ 24

13.5 Correlation between cable diameters and armour dimensions ........................... 24

13.6 Round or flat wire armour ................................................................................. 24

13.7 Double tape armour .......................................................................................... 25

14 Oversheath .................................................................................................................... 25

14.1 General ............................................................................................................ 25

14.2 Material ............................................................................................................ 25

14.3 Thickness ........................................................................................................ 25

15 Test conditions .............................................................................................................. 26

15.1 Ambient temperature ........................................................................................ 26

15.2 Frequency and waveform of power frequency test voltages ............................... 26

15.3 Waveform of impulse test voltages ................................................................... 26

15.4 Determination of the cable conductor temperature ............................................ 26

16 Routine tests ................................................................................................................. 26

16.1 General ............................................................................................................ 26

16.2 Electrical resistance of conductors ................................................................... 26

16.3 Partial discharge test ........................................................................................ 27

16.4 Voltage test ...................................................................................................... 27

16.4.1 General .......................................................................................... 27

16.4.2 Test procedure for single-core cables .............................................. 27

16.4.3 Test procedure for three-core cables ............................................... 27

16.4.4 Test voltage .................................................................................... 27

16.4.5 Requirement ................................................................................... 28

16.5 Electrical test on oversheath of the cable .......................................................... 28

17 Sample tests .................................................................................................................. 28

17.1 General ............................................................................................................ 28

17.2 Frequency of sample tests ................................................................................ 28

17.2.1 Conductor examination and check of dimensions ............................ 28

17.2.2 Electrical and physical tests ............................................................ 28

17.3 Repetition of tests ............................................................................................ 29

17.4 Conductor examination ..................................................................................... 29

17.5 Measurement of thickness of insulation and of non-metal sheaths
(including extruded separation sheaths, but excluding inner extruded

coverings) ........................................................................................................ 29

17.5.1 General .......................................................................................... 29

17.5.2 Requirements for the insulation ....................................................... 29

17.5.3 Requirements for the non-metal sheaths ......................................... 30

17.6 Measurement of thickness of lead sheath ......................................................... 30

17.6.1 General .......................................................................................... 30

17.6.2 Strip method ................................................................................... 30

17.6.3 Ring method ................................................................................... 30

17.7 Measurement of armour wires and tapes .......................................................... 30

17.7.1 Measurement on wires .................................................................... 30

17.7.2 Measurement on tapes .................................................................... 31

17.7.3 Requirements ................................................................................. 31

17.8 Measurement of external diameter ................................................................... 31

17.9 Voltage test for 4 h ........................................................................................... 31

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SIST IEC 60502-2:2022
– 4 – 60502-2 © IEC:2014

17.9.1 Sampling ........................................................................................ 31

17.9.2 Procedure ....................................................................................... 31

17.9.3 Test voltages .................................................................................. 31

17.9.4 Requirements ................................................................................. 31

17.10 Hot set test for EPR, HEPR and XLPE insulations and elastomeric

sheaths ............................................................................................................ 31

17.10.1 Procedure ....................................................................................... 31

17.10.2 Requirements ................................................................................. 32

18 Type tests, electrical ...................................................................................................... 32

18.1 General ............................................................................................................ 32

18.2 Cables having conductor screens and insulation screens .................................. 32

18.2.1 General .......................................................................................... 32

18.2.2 Sequence of tests ........................................................................... 32

18.2.3 Special provisions ........................................................................... 32

18.2.4 Bending test .................................................................................... 33

18.2.5 Partial discharge test ...................................................................... 33

18.2.6 Tan δ measurement for cables of rated voltage 6/10 (12) kV

and above ....................................................................................... 33

18.2.7 Heating cycle test ........................................................................... 34

18.2.8 Impulse test followed by a voltage test ............................................ 34

18.2.9 Voltage test for 4 h .......................................................................... 34

18.2.10 Resistivity of semi-conducting screens ............................................ 35

18.3 Cables of rated voltage 3,6/6 (7,2) kV having unscreened insulation ................. 35

18.3.1 General .......................................................................................... 35

18.3.2 Insulation resistance measurement at ambient temperature ............. 35
18.3.3 Insulation resistance measurement at maximum conductor

temperature .................................................................................... 36

18.3.4 Voltage test for 4 h .......................................................................... 36

18.3.5 Impulse test .................................................................................... 37

19 Type tests, non-electrical ............................................................................................... 37

19.1 General ............................................................................................................ 37

19.2 Measurement of thickness of insulation ............................................................ 37

19.2.1 Sampling ........................................................................................ 37

19.2.2 Procedure ....................................................................................... 37

19.2.3 Requirements ................................................................................. 37

19.3 Measurement of thickness of non-metal sheaths (including extruded

separation sheaths, but excluding inner coverings) ........................................... 37

19.3.1 Sampling ........................................................................................ 37

19.3.2 Procedure ....................................................................................... 37

19.3.3 Requirements ................................................................................. 38

19.4 Measurement of thickness of lead sheath ......................................................... 38

19.4.1 Sampling ........................................................................................ 38

19.4.2 Procedure ....................................................................................... 38

19.4.3 Requirements ................................................................................. 38

19.5 Tests for determining the mechanical properties of insulation before and

after ageing ...................................................................................................... 38

19.5.1 Sampling ........................................................................................ 38

19.5.2 Ageing treatments ........................................................................... 38

19.5.3 Conditioning and mechanical tests .................................................. 38

19.5.4 Requirements ................................................................................. 38

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SIST IEC 60502-2:2022
60502-2 © IEC:2014 – 5 –
19.6 Tests for determining the mechanical properties of non-metal sheaths

before and after ageing .................................................................................... 38

19.6.1 Sampling ........................................................................................ 38

19.6.2 Ageing treatments ........................................................................... 38

19.6.3 Conditioning and mechanical tests .................................................. 38

19.6.4 Requirements ................................................................................. 39

19.7 Additional ageing test on pieces of completed cables ........................................ 39

19.7.1 General .......................................................................................... 39

19.7.2 Sampling ........................................................................................ 39

19.7.3 Ageing treatment ............................................................................ 39

19.7.4 Mechanical tests ............................................................................. 39

19.7.5 Requirements ................................................................................. 39

19.8 Loss of mass test on PVC sheaths of type ST ................................................. 39

19.8.1 Procedure ....................................................................................... 39

19.8.2 Requirements ................................................................................. 39

19.9 Pressure test at high temperature on insulations and non-metal sheaths ........... 39

19.9.1 Procedure ....................................................................................... 39

19.9.2 Requirements ................................................................................. 39

19.10 Test on PVC insulation and sheaths at low temperatures .................................. 40

19.10.1 Procedure ....................................................................................... 40

19.10.2 Requirements ................................................................................. 40

19.11 Test for resistance of PVC insulation and sheaths to cracking (heat shock

test) ................................................................................................................. 40

19.11.1 Procedure ....................................................................................... 40

19.11.2 Requirements ................................................................................. 40

19.12 Ozone resistance test for EPR and HEPR insulations ....................................... 40

19.12.1 Procedure ....................................................................................... 40

19.12.2 Requirements ................................................................................. 40

19.13 Hot set test for EPR, HEPR and XLPE insulations and elastomeric

sheaths ............................................................................................................ 40

19.14 Oil immersion test for elastomeric sheaths ....................................................... 40

19.14.1 Procedure ....................................................................................... 40

19.14.2 Requirements ................................................................................. 40

19.15 Water absorption test on insulation ................................................................... 40

19.15.1 Procedure ....................................................................................... 40

19.15.2 Requirements ................................................................................. 40

19.16 Flame spread test on single cables ................................................................... 41

19.17 Measurement of carbon black content of black PE oversheaths ........................ 41

19.17.1 Procedure ....................................................................................... 41

19.17.2 Requirements ................................................................................. 41

19.18 Shrinkage test for XLPE insulation .................................................................... 41

19.18.1 Procedure ....................................................................................... 41

19.18.2 Requirements ................................................................................. 41

19.19 Thermal stability test for PVC insulation ............................................................ 41

19.19.1 Procedure ....................................................................................... 41

19.19.2 Requirements ................................................................................. 41

19.20 Determination of hardness of HEPR insulation .................................................. 41

19.20.1 Procedure ....................................................................................... 41

19.20.2 Requirements ................................................................................. 41

19.21 Determination of the elastic modulus of HEPR insulation .................................. 41

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SIST IEC 60502-2:2022
– 6 – 60502-2 © IEC:2014

19.21.1 Procedure ....................................................................................... 41

19.21.2 Requirements ................................................................................. 42

19.22 Shrinkage test for PE oversheaths .................................................................... 42

19.22.1 Procedure ....................................................................................... 42

19.22.2 Requirements ................................................................................. 42

19.23 Strippability test for insulation screen ............................................................... 42

19.23.1 General .......................................................................................... 42

19.23.2 Procedure ....................................................................................... 42

19.23.3 Requirements ................................................................................. 42

19.24 Water penetration test ...................................................................................... 43

20 Electrical tests after installation ...................................................................................... 43

20.1 General ............................................................................................................ 43

20.2 DC voltage test of the oversheath ..................................................................... 43

20.3 Insulation test................................................................................................... 43

20.3.1 AC testing ....................................................................................... 43

20.3.2 DC testing ....................................................................................... 44

Annex A (normative) Fictitious calculation method for determination of dimensions of

protective coverings ....................................................................................................... 50

A.1 General ............................................................................................................ 50

A.2 Method ............................................................................................................. 50

A.2.1 Conductors ..................................................................................... 50

A.2.2 Cores.............................................................................................. 51

A.2.3 Diameter over laid-up cores ............................................................ 51

A.2.4 Inner coverings ............................................................................... 51

A.2.5 Concentric conductors and metal screens ....................................... 52

A.2.6 Lead sheath .................................................................................... 53

A.2.7 Separation sheath ........................................................................... 53

A.2.8 Lapped bedding .............................................................................. 53

A.2.9 Additional bedding for tape-armoured cables (provided over

the inner covering) .......................................................................... 53

A.2.10 Armour ........................................................................................... 54

Annex B (informative) Tabulated continuous current ratings for cables having extruded

insulation and a rated voltage from 3,6/6 kV up to 18/30 kV ............................................ 55

B.1 General ............................................................................................................ 55

B.2 Cable constructions .......................................................................................... 55

B.3 Temperatures................................................................................................... 55

B.4 Soil thermal resistivity ...................................................................................... 56

B.5 Methods of installation ...................................................................................... 56

B.5.1 General .......................................................................................... 56

B.5.2 Single-core cables in air .................................................................. 56

B.5.3 Single-core cables buried direct ...................................................... 56

B.5.4 Single-core cables in earthenware ducts ......................................... 57

B.5.5 Three-core cables ........................................................................... 57

B.6 Screen bonding ................................................................................................ 58

B.7 Cable loading ................................................................................................... 58

B.8 Rating factors for grouped circuits .................................................................... 58

B.9 Correction factors ............................................................................................. 58

Annex C (normative) Rounding of numbers........................................................................... 74

C.1 Rounding of numbers for the purpose of the fictitious calculation method .......... 74

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SIST IEC 60502-2:2022
60502-2 © IEC:2014 – 7 –

C.2 Rounding of numbers for other purposes .......................................................... 74

Annex D (normative) Method of measuring resistivity of semi-conducting screens ................. 75

Annex E (normative) Determination of hardness of HEPR insulations .................................... 78

E.1 Test piece ........................................................................................................ 78

E.2 Test procedure ...................................................
...

IEC 60502-2
Edition 3.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) –
Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to
30 kV (Um = 36 kV)
Câbles d'énergie à isolant extrudé et leurs accessoires pour des tensions
assignées de 1 kV (Um = 1,2 kV) à 30 kV (Um = 36 kV) –
Partie 2: Câbles de tensions assignées de 6 kV(Um = 7,2 kV) à
30 kV (Um = 36 kV)
IEC 60502-2:2014-02(en-fr)
---------------------- Page: 1 ----------------------
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IEC 60502-2
Edition 3.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power cables with extruded insulation and their accessories for rated voltages
from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) –
Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to
30 kV (Um = 36 kV)
Câbles d'énergie à isolant extrudé et leurs accessoires pour des tensions
assignées de 1 kV (Um = 1,2 kV) à 30 kV (Um = 36 kV) –
Partie 2: Câbles de tensions assignées de 6 kV(Um = 7,2 kV) à
30 kV (Um = 36 kV)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 29.060.20 ISBN 978-2-8322-1409-1

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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CONTENTS

FOREWORD ......................................................................................................................... 10

1 Scope ............................................................................................................................ 12

2 Normative references ..................................................................................................... 12

3 Terms and definitions .................................................................................................... 14

3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) ................ 14

3.2 Definitions concerning the tests ........................................................................ 14

4 Voltage designations and materials ................................................................................ 15

4.1 Rated voltages ................................................................................................. 15

4.2 Insulating compounds....................................................................................... 16

4.3 Sheathing compounds ...................................................................................... 17

5 Conductors .................................................................................................................... 17

6 Insulation ....................................................................................................................... 17

6.1 Material ............................................................................................................ 17

6.2 Insulation thickness .......................................................................................... 17

7 Screening ...................................................................................................................... 19

7.1 General ............................................................................................................ 19

7.2 Conductor screen ............................................................................................. 19

7.3 Insulation screen .............................................................................................. 19

8 Assembly of three-core cables, inner coverings and fillers .............................................. 19

8.1 General ............................................................................................................ 19

8.2 Inner coverings and fillers ................................................................................ 19

8.2.1 Construction ................................................................................... 19

8.2.2 Material .......................................................................................... 20

8.2.3 Thickness of extruded inner covering .............................................. 20

8.2.4 Thickness of lapped inner covering ................................................. 20

8.3 Cables having a collective metal layer (see Clause 9) ....................................... 20

8.4 Cables having a metal layer over each individual core (see Clause 10) ............ 20

9 Metal layers for single-core and three-core cables .......................................................... 21

10 Metal screen .................................................................................................................. 21

10.1 Construction ..................................................................................................... 21

10.2 Requirements ................................................................................................... 21

10.3 Metal screens not associated with semi-conducting layers ................................ 21

11 Concentric conductor ..................................................................................................... 21

11.1 Construction ..................................................................................................... 21

11.2 Requirements ................................................................................................... 21

11.3 Application ....................................................................................................... 22

12 Metal sheath .................................................................................................................. 22

12.1 Lead sheath ..................................................................................................... 22

12.2 Other metal sheaths ......................................................................................... 22

13 Metal armour ................................................................................................................. 22

13.1 Types of metal armour ..................................................................................... 22

13.2 Materials .......................................................................................................... 22

13.3 Application of armour ....................................................................................... 23

13.3.1 Single-core cables .......................................................................... 23

13.3.2 Three-core cables ........................................................................... 23

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13.3.3 Separation sheath ........................................................................... 23

13.3.4 Lapped bedding under armour for lead sheathed cables .................. 23

13.4 Dimensions of the armour wires and armour tapes............................................ 24

13.5 Correlation between cable diameters and armour dimensions ........................... 24

13.6 Round or flat wire armour ................................................................................. 24

13.7 Double tape armour .......................................................................................... 25

14 Oversheath .................................................................................................................... 25

14.1 General ............................................................................................................ 25

14.2 Material ............................................................................................................ 25

14.3 Thickness ........................................................................................................ 25

15 Test conditions .............................................................................................................. 26

15.1 Ambient temperature ........................................................................................ 26

15.2 Frequency and waveform of power frequency test voltages ............................... 26

15.3 Waveform of impulse test voltages ................................................................... 26

15.4 Determination of the cable conductor temperature ............................................ 26

16 Routine tests ................................................................................................................. 26

16.1 General ............................................................................................................ 26

16.2 Electrical resistance of conductors ................................................................... 26

16.3 Partial discharge test ........................................................................................ 27

16.4 Voltage test ...................................................................................................... 27

16.4.1 General .......................................................................................... 27

16.4.2 Test procedure for single-core cables .............................................. 27

16.4.3 Test procedure for three-core cables ............................................... 27

16.4.4 Test voltage .................................................................................... 27

16.4.5 Requirement ................................................................................... 28

16.5 Electrical test on oversheath of the cable .......................................................... 28

17 Sample tests .................................................................................................................. 28

17.1 General ............................................................................................................ 28

17.2 Frequency of sample tests ................................................................................ 28

17.2.1 Conductor examination and check of dimensions ............................ 28

17.2.2 Electrical and physical tests ............................................................ 28

17.3 Repetition of tests ............................................................................................ 29

17.4 Conductor examination ..................................................................................... 29

17.5 Measurement of thickness of insulation and of non-metal sheaths
(including extruded separation sheaths, but excluding inner extruded

coverings) ........................................................................................................ 29

17.5.1 General .......................................................................................... 29

17.5.2 Requirements for the insulation ....................................................... 29

17.5.3 Requirements for the non-metal sheaths ......................................... 30

17.6 Measurement of thickness of lead sheath ......................................................... 30

17.6.1 General .......................................................................................... 30

17.6.2 Strip method ................................................................................... 30

17.6.3 Ring method ................................................................................... 30

17.7 Measurement of armour wires and tapes .......................................................... 30

17.7.1 Measurement on wires .................................................................... 30

17.7.2 Measurement on tapes .................................................................... 31

17.7.3 Requirements ................................................................................. 31

17.8 Measurement of external diameter ................................................................... 31

17.9 Voltage test for 4 h ........................................................................................... 31

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17.9.1 Sampling ........................................................................................ 31

17.9.2 Procedure ....................................................................................... 31

17.9.3 Test voltages .................................................................................. 31

17.9.4 Requirements ................................................................................. 31

17.10 Hot set test for EPR, HEPR and XLPE insulations and elastomeric

sheaths ............................................................................................................ 31

17.10.1 Procedure ....................................................................................... 31

17.10.2 Requirements ................................................................................. 32

18 Type tests, electrical ...................................................................................................... 32

18.1 General ............................................................................................................ 32

18.2 Cables having conductor screens and insulation screens .................................. 32

18.2.1 General .......................................................................................... 32

18.2.2 Sequence of tests ........................................................................... 32

18.2.3 Special provisions ........................................................................... 32

18.2.4 Bending test .................................................................................... 33

18.2.5 Partial discharge test ...................................................................... 33

18.2.6 Tan δ measurement for cables of rated voltage 6/10 (12) kV

and above ....................................................................................... 33

18.2.7 Heating cycle test ........................................................................... 34

18.2.8 Impulse test followed by a voltage test ............................................ 34

18.2.9 Voltage test for 4 h .......................................................................... 34

18.2.10 Resistivity of semi-conducting screens ............................................ 35

18.3 Cables of rated voltage 3,6/6 (7,2) kV having unscreened insulation ................. 35

18.3.1 General .......................................................................................... 35

18.3.2 Insulation resistance measurement at ambient temperature ............. 35
18.3.3 Insulation resistance measurement at maximum conductor

temperature .................................................................................... 36

18.3.4 Voltage test for 4 h .......................................................................... 36

18.3.5 Impulse test .................................................................................... 37

19 Type tests, non-electrical ............................................................................................... 37

19.1 General ............................................................................................................ 37

19.2 Measurement of thickness of insulation ............................................................ 37

19.2.1 Sampling ........................................................................................ 37

19.2.2 Procedure ....................................................................................... 37

19.2.3 Requirements ................................................................................. 37

19.3 Measurement of thickness of non-metal sheaths (including extruded

separation sheaths, but excluding inner coverings) ........................................... 37

19.3.1 Sampling ........................................................................................ 37

19.3.2 Procedure ....................................................................................... 37

19.3.3 Requirements ................................................................................. 38

19.4 Measurement of thickness of lead sheath ......................................................... 38

19.4.1 Sampling ........................................................................................ 38

19.4.2 Procedure ....................................................................................... 38

19.4.3 Requirements ................................................................................. 38

19.5 Tests for determining the mechanical properties of insulation before and

after ageing ...................................................................................................... 38

19.5.1 Sampling ........................................................................................ 38

19.5.2 Ageing treatments ........................................................................... 38

19.5.3 Conditioning and mechanical tests .................................................. 38

19.5.4 Requirements ................................................................................. 38

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19.6 Tests for determining the mechanical properties of non-metal sheaths

before and after ageing .................................................................................... 38

19.6.1 Sampling ........................................................................................ 38

19.6.2 Ageing treatments ........................................................................... 38

19.6.3 Conditioning and mechanical tests .................................................. 38

19.6.4 Requirements ................................................................................. 39

19.7 Additional ageing test on pieces of completed cables ........................................ 39

19.7.1 General .......................................................................................... 39

19.7.2 Sampling ........................................................................................ 39

19.7.3 Ageing treatment ............................................................................ 39

19.7.4 Mechanical tests ............................................................................. 39

19.7.5 Requirements ................................................................................. 39

19.8 Loss of mass test on PVC sheaths of type ST ................................................. 39

19.8.1 Procedure ....................................................................................... 39

19.8.2 Requirements ................................................................................. 39

19.9 Pressure test at high temperature on insulations and non-metal sheaths ........... 39

19.9.1 Procedure ....................................................................................... 39

19.9.2 Requirements ................................................................................. 39

19.10 Test on PVC insulation and sheaths at low temperatures .................................. 40

19.10.1 Procedure ....................................................................................... 40

19.10.2 Requirements ................................................................................. 40

19.11 Test for resistance of PVC insulation and sheaths to cracking (heat shock

test) ................................................................................................................. 40

19.11.1 Procedure ....................................................................................... 40

19.11.2 Requirements ................................................................................. 40

19.12 Ozone resistance test for EPR and HEPR insulations ....................................... 40

19.12.1 Procedure ....................................................................................... 40

19.12.2 Requirements ................................................................................. 40

19.13 Hot set test for EPR, HEPR and XLPE insulations and elastomeric

sheaths ............................................................................................................ 40

19.14 Oil immersion test for elastomeric sheaths ....................................................... 40

19.14.1 Procedure ....................................................................................... 40

19.14.2 Requirements ................................................................................. 40

19.15 Water absorption test on insulation ................................................................... 40

19.15.1 Procedure ....................................................................................... 40

19.15.2 Requirements ................................................................................. 40

19.16 Flame spread test on single cables ................................................................... 41

19.17 Measurement of carbon black content of black PE oversheaths ........................ 41

19.17.1 Procedure ....................................................................................... 41

19.17.2 Requirements ................................................................................. 41

19.18 Shrinkage test for XLPE insulation .................................................................... 41

19.18.1 Procedure ....................................................................................... 41

19.18.2 Requirements ................................................................................. 41

19.19 Thermal stability test for PVC insulation ............................................................ 41

19.19.1 Procedure ....................................................................................... 41

19.19.2 Requirements ................................................................................. 41

19.20 Determination of hardness of HEPR insulation .................................................. 41

19.20.1 Procedure ....................................................................................... 41

19.20.2 Requirements ................................................................................. 41

19.21 Determination of the elastic modulus of HEPR insulation .................................. 41

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19.21.1 Procedure ....................................................................................... 41

19.21.2 Requirements ................................................................................. 42

19.22 Shrinkage test for PE oversheaths .................................................................... 42

19.22.1 Procedure ....................................................................................... 42

19.22.2 Requirements ................................................................................. 42

19.23 Strippability test for insulation screen ............................................................... 42

19.23.1 General .......................................................................................... 42

19.23.2 Procedure ....................................................................................... 42

19.23.3 Requirements ................................................................................. 42

19.24 Water penetration test ...................................................................................... 43

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