SIST EN 50525-2-21:2011
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V (Uo/U) - Part 2-21: Cables for general applications - Flexible cables with crosslinked elastomeric insulation
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V (Uo/U) - Part 2-21: Cables for general applications - Flexible cables with crosslinked elastomeric insulation
EN 50525-2-21 applies to flexible cables, insulated with crosslinked elastomeric compound, and sheathed with either crosslinked elastomeric compound or thermoplastic polyurethane (TPU). The cables are of rated voltages U0/U up to and including 450/750 V. The cables are intended for a variety of applications where appliances or equipment, including heavy industrial equipment, require a flexible connection to the power supply. The maximum conductor operating temperatures for the cables in this standard are 60 °C (R types), 90 °C (B types) and 110 °C (G types). The following particular cable types are included: - General purpose cables (RR and RN types); - Water-resistant cables (RN8 types); - General purpose cables (BB and BN4 types); - TPU sheathed cables (BQ types); - Heat resistant cables (GG types)
Kabel und Leitungen - Starkstromleitungen mit Nennspannungen bis 450/750 V (Uo/U) - Teil 2-21: Starkstromleitungen für allgemeine Anwendungen - Flexible Leitungen mit vernetzter Elastomer- Isolierung
Câbles électriques - Câbles d’énergie basse tension de tension assignée au plus égale à 450/750 V (Uo/U) - Partie 2-21: Câbles pour applications générales - Câbles souples isolés en matériau élastomère réticulé
Električni kabli - Nizkonapetostni energetski kabli z naznačeno napetostjo do vključno 450/750 V (Uo/U) - 2-21. del: Kabli za splošno uporabo - Zvijavi kabli z zamreženo elastomerno izolacijo
EN 50525-2-21 velja za zvijave kable, izolirane z zamreženo elastomerno sestavino in s plaščem iz bodisi zamrežene elastomerne sestavine bodisi termoplastičnega poliuretana (TPU). Ti kabli imajo nazivno napetost do in vključno 450/750 V (UO/U). Kabli so namenjeni različnim uporabam, pri katerih aparati ali oprema vključno s težko industrijsko opremo zahtevajo fleksibilno povezavo z napajanjem. Maksimalne delovne temperature pretvornika za kable iz tega standarda so 60 °C (tipi R), 90 °C (tipi B) in 110 °C (tipi G). Vključeni so naslednji tipi kablov: – kabli za splošne namene (tipov RR in RN); – vodoodporni kabli (tipov RN8); – kabli za splošne namene (tipov BB in BN4); – kabli s plaščem iz TPU (tipov BQ); – toplotno odporni kabli (tipov GG).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50525-2-21:2011
01-julij-2011
(OHNWULþQLNDEOL1L]NRQDSHWRVWQLHQHUJHWVNLNDEOL]QD]QDþHQRQDSHWRVWMRGR
YNOMXþQR9 8R8 GHO .DEOL]DVSORãQRXSRUDER=YLMDYLNDEOL]
]DPUHåHQRHODVWRPHUQRL]RODFLMR
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750
V (Uo/U) - Part 2-21: Cables for general applications - Flexible cables with crosslinked
elastomeric insulation
Kabel und Leitungen - Starkstromleitungen mit Nennspannungen bis 450/750 V (Uo/U) -
Teil 2-21: Starkstromleitungen für allgemeine Anwendungen - Flexible Leitungen mit
vernetzter Elastomer- Isolierung
Câbles électriques - Câbles d’énergie basse tension de tension assignée au plus égale à
450/750 V (Uo/U) - Partie 2-21: Câbles pour applications générales - Câbles souples
isolés en matériau élastomère réticulé
Ta slovenski standard je istoveten z: EN 50525-2-21:2011
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
SIST EN 50525-2-21:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50525-2-21:2011
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SIST EN 50525-2-21:2011
EUROPEAN STANDARD
EN 50525-2-21
NORME EUROPÉENNE
May 2011
EUROPÄISCHE NORM
ICS 29.060.20 Supersedes HD 22.4 S4:2004, HD 22.10 S2:2007, HD 22.11 S2:2007, HD 22.12 S2:2007, HD
22.16 S2:2007
English version
Electric cables -
Low voltage energy cables of rated voltages up to and including 450/750 V
(U /U) -
0
Part 2-21: Cables for general applications -
Flexible cables with crosslinked elastomeric insulation
Câbles électriques - Kabel und Leitungen -
Câbles d’énergie basse tension de tension Starkstromleitungen mit Nennspannungen
assignée au plus égale à 450/750 V bis 450/750 V (U /U) -
0
(U /U) - Teil 2-21: Starkstromleitungen für
0
Partie 2-21: Câbles pour applications allgemeine Anwendungen -
générales - Flexible Leitungen mit vernetzter
Câbles souples isolés en matériau Elastomer-Isolierung
élastomère réticulé
This European Standard was approved by CENELEC on 2011-01-17. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50525-2-21:2011 E
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SIST EN 50525-2-21:2011
EN 50525-2-21:2011 - 2 -
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 20, Electric
cables.
The text of the draft was submitted to the formal vote and was accepted by CENELEC as
EN 50525-2-21 on 2011-01-17.
This document, which is one of a multipart series, supersedes HD 22.4 S4:2004,
HD 22 10 S2:2007, HD 22.11 S2:2007, HD 22.12 S2:2007, HD 22.16 S2:2007.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any
or all such patent rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-01-17
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-17
_______________
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Contents
Page
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 General purpose cables . 6
4.1 Ordinary duty cables – H05RR-F . 6
4.2 Ordinary duty cables – H05RN-F . 7
4.3 Heavy duty cables – H07RN-F . 8
4.4 Heavy duty multicore cables – H07RN-F . 9
5 Water resistant cables . 10
5.1 Heavy duty cables – H07RN8-F . 10
5.2 Heavy duty multicore cables – H07RN8-F . 12
6 Heat resistant cables (90 °C) . 13
6.1 Ordinary duty cables – H05BB-F . 13
6.2 Heavy duty cables – H07BB-F . 14
6.3 Ordinary duty cables – H05BN4-F . 16
6.4 Heavy duty cables – H07BN4-F. 16
6.5 Heavy duty multicore cables – H07BN4-F . 18
7 Heat resistant cables – TPU sheathed (90 °C) . 19
7.1 Ordinary duty cables – H05BQ-F . 19
7.2 Heavy duty cables – H07BQ-F . 20
8 Heat resistant EVA cables (110 °C) - Ordinary duty cables – H05GG-F and
H05GGH2-F . 21
8.1 Construction . 21
8.2 Requirements . 22
Annex A (normative) Tests for cables to EN 50525-2-21 . 23
Annex B (normative) General data . 27
Annex C (normative) Requirements for compatibility test . 33
C.1 Cables with a 60 °C temperature rating . 33
C.2 Cables with a 90 °C temperature rating . 33
C.3 Cables with a 110 °C temperature rating . 34
Annex D (normative) Water resistance test for H07RN8-F flexible cables – Electrical
test . 35
D.1 Voltage pre-test on completed cables . 35
D.2 Voltage test on completed cable at 50 °C . 35
D.3 Insulation resistance test after pre-voltage test . 35
Annex E (normative) Water resistance test for H07RN8-F flexible cables – Mechanical
properties of sheath after water immersion . 37
E.1 G e ner a l . 37
E.2 Procedure . 37
E.3 Requirements . 37
Annex F (normative) Special national conditions . 39
Bibliography . 40
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EN 50525-2-21:2011 - 4 -
Tables
Table A.1 − 60 °C cables . 23
Table A.1 − 60 °C cables (concluded) . 24
Table A.2 − 90 °C and 110 °C cables . 25
Table B.1 . 27
Table B.2 . 28
Table B.3 . 31
Table B.4 . 32
Table C.1 . 33
Table C.2 . 33
Table C.3 . 34
Table E.1 − Requirements for tensile strength and elongation at break . 38
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1 Scope
EN 50525-2-21 applies to flexible cables, insulated with crosslinked elastomeric compound,
and sheathed with either crosslinked elastomeric compound or thermoplastic polyurethane
(TPU).
The cables are of rated voltages U /U up to and including 450/750 V.
0
The cables are intended for a variety of applications where appliances or equipment,
including heavy industrial equipment, require a flexible connection to the power supply.
The maximum conductor operating temperatures for the cables in this standard are 60 °C (R
types), 90 °C (B types) and 110 °C (G types).
The following particular cable types are included:
- General purpose cables (RR and RN types);
- Water-resistant cables (RN8 types);
- General purpose cables (BB and BN4 types);
- TPU sheathed cables (BQ types);
- Heat resistant cables (GG types)
NOTE HD 516 contains extensive guidance on the safe use of cables in this standard.
This EN 50525-2-21 should be read in conjunction with EN 50525-1, which specifies general
requirements.
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.
NOTE One or more references to the standards below are in respect of a specific sub-division of that standard,
for instance a clause, a table, a class or a type. Cross-references to these standards are undated and, at all times,
the latest version applies.
EN 50363-1 Insulating, sheathing and covering materials for low voltage
energy cables - Part 1: Cross-linked elastomeric insulating
compounds
EN 50363-2-1 Insulating, sheathing and covering materials for low voltage
energy cables - Part 2-1: Cross-linked elastomeric sheathing
compounds
EN 50363-10-2 Insulating, sheathing and covering materials for low voltage
energy cables - Part 10-2: Miscellaneous sheathing compounds -
Thermoplastic polyurethane
EN 50395 Electrical test methods for low voltage energy cables
EN 50396 Non electrical test methods for low voltage energy cables
EN 50525-1 Electric cables - Low voltage energy cables of rated voltages up
to and including 450/750 V (U /U) - Part 1: General requirements
0
EN 60228 Conductors of insulated cables (IEC 60228)
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EN 50525-2-21:2011 - 6 -
Tests on electric and optical fibre cables under fire conditions -
EN 60332-1-2
Part 1-2: Test for vertical flame propagation for a single insulated
wire or cable - Procedure for 1 kW pre-mixed flame
(IEC 60332-1-2)
Insulating and sheathing materials of electric and optical cables -
EN 60811-1-1
Common test methods - Part 1-1: General application -
Measurement of thickness and overall dimensions - Tests for
determining the mechanical properties (IEC 60811-1-1)
Insulating and sheathing materials of electric and optical cables -
EN 60811-1-2
Common test methods - Part 1-2: General application - Thermal
ageing methods (IEC 60811-1-2)
Insulating and sheathing materials of electric and optical cables -
EN 60811-1-4
Common test methods - Part 1-4: General application - Tests at
low temperature (IEC 60811-1-4)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in Clause 3 of EN 50525-1
apply.
4 General purpose cables
4.1 Ordinary duty cables – H05RR-F
4.1.1 Construction
4.1.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
4.1.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- 2 and 5 core – 0,75 mm to 4 mm ;
2 2
- 3 and 4 core – 0,75 mm to 6 mm .
4.1.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1,
applied around each conductor.
4.1.1.4 Assembly
The cores shall be twisted together.
NOTE 1 A centre filler may be used.
NOTE 2 A tape may be applied around the core assembly before application of the sheath.
4.1.1.5 Sheath
The sheath shall be a cross-linked elastomeric compound of Type EM 3 to EN 50363-2-1.
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The sheath shall fill the spaces between the cores.
The colour of sheath is not specified.
NOTE If black is used, the requirement in EN 50363-2-1 for EM 3 to have a minimum level of carbon black will
apply.
4.1.1.6 Marking
The cable shall be marked with the CENELEC code H05RR-F. The marking shall comply with
Clause 6 of EN 50525-1.
4.1.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 6.
The dimensions of the cables shall conform to Table B.1 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
4.2 Ordinary duty cables – H05RN-F
4.2.1 Construction
4.2.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
4.2.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- 2, 3 and 4 core – 0,75 mm and 1 mm .
4.2.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1,
applied around each conductor.
4.2.1.4 Assembly
The cores shall be twisted together.
NOTE 1 A centre filler may be used.
NOTE 2 A tape may be applied around the core assembly before application of the sheath.
4.2.1.5 Sheath
The sheath shall be a cross-linked elastomeric compound of Type EM 2 to EN 50363-2-1.
The sheath shall fill the spaces between the cores.
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EN 50525-2-21:2011 - 8 -
4.2.1.6 Marking
The cable shall be marked with the CENELEC code H05RN-F. The marking shall comply with
Clause 6 of EN 50525-1.
4.2.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 7.
The dimensions of the cables shall conform to Table B.1 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
4.3 Heavy duty cables – H07RN-F
4.3.1 Construction
4.3.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
4.3.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- Single core – 1,5 mm to 630 mm ;
2 2
- 2 and 5 core – 1,0 mm to 95 mm ;
2 2
- 3 and 4 core – 1,0 mm to 300 mm .
4.3.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1,
applied around each conductor.
NOTE It is permitted to apply a tape on each core.
Where the insulation is covered with a tape, it shall be applied in such a manner that it can be
removed without damage to the insulation.
4.3.1.4 Assembly
The cores of cables having two to five cores shall be twisted together.
NOTE 1 A centre filler may be used.
NOTE 2 A tape may be applied around the core assembly before application of the sheath.
4.3.1.5 Sheath
The cores shall be covered with a sheath.
a) For cables with a specified sheath thickness up to and including 2,4 mm:
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1) sheath in a single layer, cross-linked elastomeric compound of type EM 2 to
EN 50363-2-1.
b) For cables with a specified sheath thickness greater than 2,4 mm:
1) sheath either in a single layer, cross-linked elastomeric compound of type EM 2 to
EN 50363-2-1;
2) or in two layers, with the inner layer made of one of the cross-linked elastomeric
compounds type EM 2 or EM 3 to EN 50363-2-1 and the outer layer of the cross-
linked elastomeric compound type EM 2 to EN 50363-2-1.
The sheath applied in a single layer or the inner layer of the sheath in two layers shall, for
cables with two to five cores, fill the spaces between the cores. Where a tape of suitable
material is applied around the core assembly (see NOTE 2 to 4.3.1.4) this requirement shall
not apply, provided that the finished cables shall not have any substantial cavity in the outer
interstices between the cores.
4.3.1.6 Marking
The cable shall be marked with the CENELEC code H07RN-F. The marking shall comply with
Clause 6 of EN 50525-1.
4.3.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 8.
NOTE For non-electrical tests on sheaths in two layers see EN 50525-1, 5.7.2.3, c).
The dimensions of the cables shall conform to Table B.2 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
4.4 Heavy duty multicore cables – H07RN-F
4.4.1 Construction
4.4.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
4.4.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- 6, 7, 12, 18, 24 and 36 core – 1,5 mm and 2,5 mm ;
2
- 6, 7, 12 and 18 core – 4 mm .
NOTE The number of cores given here is preferred. Other numbers of cores are permitted up to the maximum
number stated in the table for the given size of conductor, subject to agreement between the purchaser and
manufacturer. See also footnote c to Table B.3.
4.4.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1
applied around each conductor.
The identification of each core shall be in accordance with Annex D of EN 50525-1.
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EN 50525-2-21:2011 - 10 -
4.4.1.4 Assembly
The cores shall be twisted together. A single core in the centre is not permitted. A protective
conductor, if any, shall be applied in the outer layer. A centre filler shall be used for cables
having 6, 7, 18, and 36 cores, and also for 19 cores when this non-preferred size is used.
NOTE 1 A centre filler may be used for other sizes.
NOTE 2 A tape may be applied around the core assembly before application of the sheath.
4.4.1.5 Sheath
The core assembly shall be covered with a sheath. The sheath shall be applied either in a
single layer, cross-linked elastomeric compound EM 2 to EN 50363-2-1, or in two layers, with
the inner layer made of one of the cross-linked elastomeric compounds EM 2 or EM 3 to
EN 50363-2-1 and the outer layer of cross-linked elastomeric compound EM 2 to
EN 50363-2-1.
The sheath in a single layer or the inner layer of the sheath in two layers shall fill the spaces
between the cores. Where a tape of suitable material is applied around the core assembly
(see NOTE 2 to 4.4.1.4) this requirement shall not apply, provided that the finished cables
shall not have any substantial cavity in the outer interstices between the cores.
4.4.1.6 Marking
The cable shall be marked with the CENELEC code H07RN-F. The marking shall comply with
Clause 6 of EN 50525-1.
4.4.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 9.
NOTE For non-electrical tests on sheaths in two layers see EN 50525-1, 5.7.2.3, c).
The dimensions of the cables shall conform to Table B.3 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
5 Water resistant cables
5.1 Heavy duty cables – H07RN8-F
5.1.1 Construction
5.1.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
Where an optional separator is applied around each conductor it shall be non-hygroscopic.
5.1.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- Single core – 1,5 mm to 630 mm ;
2 2
- 2 and 5 core – 1,0 mm to 25 mm ;
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2 2
- 3 and 4 core – 1,0 mm to 300 mm .
5.1.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1
applied around each conductor.
NOTE It is permitted to apply a tape on each core.
Where the insulation is covered with a tape, it shall be non-hygroscopic and shall be applied
in such a manner that it can be removed without damage to the insulation.
5.1.1.4 Assembly
The cores of cables having two to five cores shall be twisted together.
NOTE 1 A centre filler may be used.
NOTE 2 A non-hygroscopic tape may be applied around the core assembly before
application of the sheath.
5.1.1.5 Sheath
The cores shall be covered with a sheath.
a) For cables with a specified sheath thickness up to and including 2,4 mm:
1) sheath in a single layer, cross-linked elastomeric compound of type EM 2 to
EN 50363-2-1.
b) For cables with a specified sheath thickness greater than 2,4 mm:
1) sheath either in a single layer, cross-linked elastomeric compound of type EM 2 to
EN 50363-2-1;
2) or in two layers, with the inner layer made of one of the cross-linked elastomeric
compounds type EM 2 or EM 3 to EN 50363-2-1 and the outer layer of the cross-
linked compound type EM 2 to EN 50363-2-1.
The sheath applied in a single layer or the inner layer of the sheath in two layers shall, for
cables with two to five cores, fill the spaces between the cores. Where a non-hygroscopic
tape of suitable material is applied around the core assembly (see NOTE 2 to 5.1.1.4) this
requirement shall not apply, provided that the finished cables shall not have any substantial
cavity in the outer interstices between the cores.
5.1.1.6 Marking
The cable shall be marked with the CENELEC code H07RN8-F. The marking shall comply
with Clause 6 of EN 50525-1.
5.1.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 10.
NOTE For non-electrical tests on sheaths in two layers see EN 50525-1, 5.6.2.3, c).
The dimensions of the cables shall conform to Table B.2 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
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The requirements to be met for the water resistance tests shall be as given in Annexes D
and E.
5.2 Heavy duty multicore cables – H07RN8-F
5.2.1 Construction
5.2.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
Where an optional separator is applied around each conductor it shall be non-hygroscopic.
5.2.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- 6, 7, 12, 18, 24 and 36 core – 1,5 mm and 2,5 mm ;
2
- 6, 7, 12 and 18 core – 4 mm .
NOTE The number of cores given here is preferred. Other numbers of cores are permitted up to the maximum
number stated in the table for the given size of conductor, subject to agreement between the purchaser and
manufacturer. See also footnote c to Table B.3.
5.2.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 4 to EN 50363-1,
applied around each conductor.
The identification of each core shall be in accordance with Annex D of EN 50525-1.
5.2.1.4 Assembly
The cores shall be twisted together. A single core in the centre is not permitted. A protective
conductor, if any, shall be applied in the outer layer. A centre filler shall be used for cables
having 6, 7, 18, and 36 cores, and also for 19 cores when this non-preferred size is used.
NOTE 1 A centre filler may be used for other sizes.
The centre filler shall consist of a non-hygroscopic material.
NOTE 2 A non-hygroscopic tape may be applied around the core assembly before application of the sheath.
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5.2.1.5 Sheath
The core assembly shall be covered with a sheath. The sheath shall be applied either in a
single layer, cross-linked elastomeric compound EM 2 to EN 50363-2-1, or in two layers, with
the inner layer made of one of the cross-linked elastomeric compounds EM 2 or EM 3 to
EN 50363-2-1 and the outer layer of cross-linked elastomeric compound EM 2 to
EN 50363-2-1.
The sheath in a single layer or the inner layer of the sheath in two layers shall fill the spaces
between the cores. Where a non-hygroscopic tape of suitable material is applied around the
core assembly (see NOTE 2 to 5.2.1.4) this requirement shall not apply, provided that the
finished cables shall not have any substantial cavity in the outer interstices between the
cores.
5.2.1.6 Marking
The cable shall be marked with the CENELEC code H07RN8-F. The marking shall comply
with Clause 6 of EN 50525-1.
5.2.2 Requirements
Each cable shall comply with the appropriate requirements given in EN 50525-1, and the
particular requirements of this Part.
Testing shall be in accordance with Table A.1, column 11.
NOTE For non-electrical tests on sheaths in two layers see EN 50525-1, 5.7.2.3, c).
The dimensions of the cables shall conform to Table B.3 for the relevant size.
The requirements to be met for the compatibility test shall be as given in Table C.1.
The requirements to be met for the water resistance tests shall be as given in Annexes D
and E.
6 Heat resistant cables (90 °C)
6.1 Ordinary duty cables – H05BB-F
6.1.1 Construction
6.1.1.1 Conductor
The conductor shall be class 5, according to EN 60228.
6.1.1.2 Sizes of cable
The sizes of cable shall be:
2 2
- 2 and 5 core – 0,75 mm to 2,5 mm ;
2 2
- 3 and 4 core – 0,75 mm to 6 mm .
6.1.1.3 Insulation
The insulation shall be a cross-linked elastomeric compound, Type EI 6 to EN 50363-1,
applied around each conductor.
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SIST EN 50525-2-21:2011
EN 50525-2-21:2011 - 14 -
6.1.1.4 Assembly
The cores shall be twisted together.
NOTE 1 A centre filler may be used.
NOTE 2 A tape may be applied around the core assembly before application of the sheath.
6.1.1.5 Sheath
The sheath shall be a cross-linked elastomeric compound of Type EM 6 to EN 50363-2-1.
The
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