SIST EN 50264-2-1:2008
Railway applications - Railway rolling stock power and control cables having special fire performance -- Part 2-1: Cables with crosslinked elastomeric insulation - Single core cables
- Abstract
EN 50264-2-1 specifies requirements for, and constructions and dimensions of, single core cables of the following types and voltage ratings: • 0,6/1 kV unscreened, unsheathed (1 mm² to 400 mm²); • 1,8/3 kV unscreened, unsheathed (1,5 mm² to 400 mm²); • 1,8/3 kV unscreened, sheathed (1,5 mm² to 400 mm²); • 3,6/6 kV unscreened, sheathed (2,5 mm² to 400 mm²). All cables have class 5 tinned copper conductors to EN 60228, halogen-free insulation and halogen-free sheath. They are for use in railway rolling stock as fixed wiring, or wiring where limited flexing in operation is encountered. The requirements provide for a continuous conductor temperature not exceeding 90 °C and a maximum temperature for short circuit conditions of 200 °C based on a duration of 5 s. Under fire conditions the cables exhibit special performance characteristics in respect of maximum permissible flame propagation (flame spread) and maximum permissible emission of smoke and toxic gases. EN 50264-2-1 should be read in conjunction with Part 1 “General requirements”.
- Status
- Published
- Publication Date
- 21-Jul-2008
- Technical Committee
- IEKA - Electric cables
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 02-Jul-2008
- Due Date
- 06-Sep-2008
- Completion Date
- 22-Jul-2008
SIST EN 50264-2-1:2008 is the Slovenian adoption of EN 50264-2-1:2008, a European standard for railway rolling stock power and control cables with special fire performance. It specifies single core cables with crosslinked elastomeric insulation for fixed wiring, or wiring with limited flexing in operation, and sets their construction, dimensions, marking, tests and fire-related performance.
What does SIST EN 50264-2-1:2008 specify?
SIST EN 50264-2-1:2008 specifies single core railway cables in four voltage categories, with or without sheath, and with crosslinked elastomeric insulation. It also sets the cable sizes, conductor type, insulation and sheath materials, and the performance checks needed to show conformity.
The document is organized into:
- Clause 1 - Scope
- Clause 2 - Normative references
- Clause 3 - Definitions
- Clause 4 - Rated voltage
- Clause 5 - Marking and identification
- Clause 6 - Construction of cables
- Clause 7 - Tests
- Annex A - Code designation
| Annex | What it covers |
|---|---|
| A | Code designation for insulation and sheath compounds, plus the additional code letter for a metallic screen |
The standard applies to cables for railway rolling stock, where the cable may be used as fixed wiring or in locations with limited flexing. In practice, that tells a designer or buyer what cable family is covered and what type of installation it is intended for.
What are the key requirements of SIST EN 50264-2-1:2008?
SIST EN 50264-2-1:2008 defines the cable build-up, the permitted voltage ratings, the required materials, and the tests that confirm electrical, mechanical and fire performance. The most important requirements are grouped below by what they mean for production and acceptance.
Cable types, voltages and sizes
Clause 1 limits the document to four cable types: 0,6/1 kV unscreened unsheathed, 1,8/3 kV unscreened unsheathed, 1,8/3 kV unscreened sheathed, and 3,6/6 kV unscreened sheathed. Clause 4 repeats the rated voltages for unsheathed and sheathed constructions. For users, this means the standard is not a general railway cable standard - it is focused on single core cables in these defined voltage families.
The scope also fixes the conductor range for each family. The tables then give the corresponding nominal cross-sectional areas, insulation thicknesses, overall diameters and electrical values. For procurement and design, those tables are the basis for selecting the right size and checking that the delivered cable matches the declared type.
Materials and construction
Clause 6 requires class 5 tin-coated annealed copper conductors to EN 60228. It also requires a minimum wire elongation when tested to EN 10002-1, which helps confirm that the conductor is sufficiently ductile for cable manufacture and railway use.
The insulation system must use extruded materials meeting EI 101 to EI 105, and the sheath, where present, must use EM 101 to EM 104. The document links each code to a resistance profile such as low temperature resistance, extra low temperature resistance, oil resistance, or extra oil and fuel resistance. In practice, this lets the purchaser specify cable performance by environment rather than by compound recipe.
For 3,6/6 kV cables, conductor screening is required. Separators are optional in the constructions covered by the part. Sheath and insulation thicknesses must match the values given in the relevant tables, so production control has a dimensional target, not just a material target.
Marking and identification
Clause 5 requires the cable marking to include the manufacturer’s name, the EN reference, the voltage rating, conductor size and the code designation from Annex A. Core insulation is normally black unless another colour is specified, and any other colour must follow HD 308. The sheath is also normally black unless otherwise specified.
For users, this matters because the marking and colour rules support traceability, installation checks and later maintenance. Clause 5 also requires the colour to be durable and visually identifiable, so the cable remains identifiable after handling and service.
Electrical, mechanical and fire tests
Clause 7 sets the verification program. It covers conductor resistance, voltage test, insulation resistance, dielectric strength, spark test, d.c. stability, surface resistance, ageing, hot set, compatibility, water absorption, ozone resistance, mineral oil resistance, fuel resistance, acid and alkali resistance, low-temperature bending or elongation, impact at low temperature, and reaction to fire.
The test schedule in Table 5 shows which tests are type, sample or routine tests. That is practical for manufacturers and approval bodies because it separates design validation from batch control and ongoing production checks.
The fire-related part is especially important for railway use. Clause 7.20 requires the complete cable to meet the reaction-to-fire requirements in EN 50264-1, and Clause 7.21 applies similar requirements to insulation, sheath and, where relevant, conductor screening and tapes. Table 5 also links the cable to flame spread and smoke emission test methods. For buyers and safety teams, that is the part that shows the cable family is intended for railway rolling stock with special fire performance.
What terms does SIST EN 50264-2-1:2008 define?
SIST EN 50264-2-1:2008 uses the definitions from EN 50264-1, and several terms are central to reading the part.
- Rated voltage - the nominal voltage level assigned to a cable type, used to select the correct construction and test voltage.
- Conductor screening - a screened layer used on the 3,6/6 kV construction to control electrical performance around the conductor.
- Separator - an optional layer placed over the conductor or between insulation and sheath to assist construction.
- Type (T) test - a verification test used to qualify the cable design or construction.
- Sample (S) test - a test applied to selected samples, often for approval or batch checking.
- Routine (R) test - a production test applied to manufactured cable items.
- EI 101 to EI 105 - insulation system codes that identify the required resistance profile of the insulation.
- EM 101 to EM 104 - sheath compound codes that identify the required resistance profile of the sheath.
Who uses SIST EN 50264-2-1:2008?
SIST EN 50264-2-1:2008 is used by cable manufacturers, railway rolling stock designers, test laboratories, quality teams and buyers who specify cabling for railway vehicles. Manufacturers use it to choose materials, build the cable and mark it correctly. Test labs use it to run the electrical, mechanical and fire tests in Clause 7 and Table 5. Buyers and quality managers use it to check that a cable offered for railway use matches the intended voltage, size, construction and special fire performance.
What changed in SIST EN 50264-2-1:2008 from the previous edition?
SIST EN 50264-2-1:2008 states that it supersedes EN 50264-2:2002 and replaces SIST EN 50264-2:2003.
Which standards are used with SIST EN 50264-2-1:2008?
| Standard | What it contributes |
|---|---|
| EN 50264-1:2008 | General requirements for the EN 50264 series, including definitions, marking rules, and fire performance requirements |
| EN 50305:2002 | Test methods used throughout the standard for electrical and fire-related checks |
| EN 60228 | Requirements for conductors of insulated cables |
| EN 10002-1 | Tensile testing method for conductor wire elongation checks |
| EN 50266-2-4 | Vertical flame spread test method for bunched cables, Category C |
| EN 50266-2-5 | Vertical flame spread test method for small bunched cables, Category D |
| EN 60332-1-2 | Flame propagation test for a single insulated wire or cable |
| EN 60811-1-1 | Thickness, overall dimensions and mechanical property tests |
| EN 60811-1-2 | Thermal ageing methods |
| EN 60811-1-3 | Water absorption and shrinkage-related test methods |
| EN 60811-1-4 | Low-temperature test methods |
| EN 60811-2-1 | Elastomeric compound tests such as ozone, hot set and mineral oil resistance |
| EN 61034-2 | Smoke density measurement under defined burning conditions |
| HD 308 | Core identification rules by colour |
| EN 50343 | Cable selection and installation rules for railway rolling stock |
| EN 50355 | Guide for use of railway cables, including current ratings |
What does the SIST EN 50264-2-1:2008 document contain?
SIST EN 50264-2-1:2008 contains four data tables for the cable families, a detailed construction clause, and a test clause that links each requirement to a method. Table 1 to Table 4 give the dimensional and electrical data for the four cable types. Table 5 gives the test schedule and shows which tests apply to type, sample and routine control.
It also contains the cable marking format, the code designation system in Annex A, and the references needed to read the part together with EN 50264-1. For engineering work, that means the document supports cable selection, product design, conformity testing and acceptance checks for railway rolling stock cabling.
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Frequently Asked Questions
SIST EN 50264-2-1:2008 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Railway applications - Railway rolling stock power and control cables having special fire performance -- Part 2-1: Cables with crosslinked elastomeric insulation - Single core cables". This standard covers: EN 50264-2-1 specifies requirements for, and constructions and dimensions of, single core cables of the following types and voltage ratings: • 0,6/1 kV unscreened, unsheathed (1 mm² to 400 mm²); • 1,8/3 kV unscreened, unsheathed (1,5 mm² to 400 mm²); • 1,8/3 kV unscreened, sheathed (1,5 mm² to 400 mm²); • 3,6/6 kV unscreened, sheathed (2,5 mm² to 400 mm²). All cables have class 5 tinned copper conductors to EN 60228, halogen-free insulation and halogen-free sheath. They are for use in railway rolling stock as fixed wiring, or wiring where limited flexing in operation is encountered. The requirements provide for a continuous conductor temperature not exceeding 90 °C and a maximum temperature for short circuit conditions of 200 °C based on a duration of 5 s. Under fire conditions the cables exhibit special performance characteristics in respect of maximum permissible flame propagation (flame spread) and maximum permissible emission of smoke and toxic gases. EN 50264-2-1 should be read in conjunction with Part 1 “General requirements”.
EN 50264-2-1 specifies requirements for, and constructions and dimensions of, single core cables of the following types and voltage ratings: • 0,6/1 kV unscreened, unsheathed (1 mm² to 400 mm²); • 1,8/3 kV unscreened, unsheathed (1,5 mm² to 400 mm²); • 1,8/3 kV unscreened, sheathed (1,5 mm² to 400 mm²); • 3,6/6 kV unscreened, sheathed (2,5 mm² to 400 mm²). All cables have class 5 tinned copper conductors to EN 60228, halogen-free insulation and halogen-free sheath. They are for use in railway rolling stock as fixed wiring, or wiring where limited flexing in operation is encountered. The requirements provide for a continuous conductor temperature not exceeding 90 °C and a maximum temperature for short circuit conditions of 200 °C based on a duration of 5 s. Under fire conditions the cables exhibit special performance characteristics in respect of maximum permissible flame propagation (flame spread) and maximum permissible emission of smoke and toxic gases. EN 50264-2-1 should be read in conjunction with Part 1 “General requirements”.
SIST EN 50264-2-1:2008 is classified under the following ICS (International Classification for Standards) categories: 13.220.20 - Fire protection; 29.060.20 - Cables; 45.060.01 - Railway rolling stock in general. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 50264-2-1:2008 has the following relationships with other standards: It is inter standard links to SIST EN 50264-2:2003, SIST EN 50305:2020, SIST EN IEC 60228:2024, SIST EN 50264-1:2008, SIST EN 60811-2-1:2000, SIST EN 60811-1-4:1999, SIST EN 60811-1-2:1999, SIST HD 308 S2:2002, SIST EN 60811-1-1:1999, SIST EN 61034-2:2005, SIST EN 60811-1-3:1999, SIST EN IEC 60332-3-25:2018, SIST EN IEC 60332-3-24:2018, SIST EN 60332-1-2:2005, SIST EN 45545-2:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 50264-2-1:2008 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2008
1DGRPHãþD
SIST EN 50264-2:2003
Železniške naprave - Energetski in krmilni kabli za železniška vozna sredstva, ki
imajo posebne ognjevarne lastnosti - 2-1. del: Kabli z zamreženo elastomerno
izolacijo - Enožilni kabli
Railway applications - Railway rolling stock power and control cables having special fire
performance -- Part 2-1: Cables with crosslinked elastomeric insulation - Single core
cables
Bahnanwendungen - Starkstrom- und Steuerleitungen für Schienenfahrzeuge mit
verbessertem Verhalten im Brandfall -- Teil 2-1: Leitungen mit vernetzter elastomerer
Isolierung - Einadrige Leitungen
Applications ferroviaires - Câbles de puissance et de contrôle à comportement au feu
spécifié pour matériel roulant ferroviaire -- Partie 2-1: Câbles à enveloppe isolante
réticulée - Câbles monoconducteurs
Ta slovenski standard je istoveten z: EN 50264-2-1:2008
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
29.060.20 Kabli Cables
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 50264-2-1
NORME EUROPÉENNE
June 2008
EUROPÄISCHE NORM
ICS 13.220.20; 29.060.20; 45.060.01 Supersedes EN 50264-2:2002
English version
Railway applications -
Railway rolling stock power and control cables
having special fire performance -
Part 2-1: Cables with crosslinked elastomeric insulation -
Single core cables
Applications ferroviaires - Bahnanwendungen -
Câbles de puissance et de contrôle Starkstrom- und Steuerleitungen
à comportement au feu spécifié für Schienenfahrzeuge
pour matériel roulant ferroviaire - mit verbessertem Verhalten im Brandfall -
Partie 2-1: Câbles à enveloppe Teil 2-1: Leitungen mit vernetzter
isolante réticulée - elastomerer Isolierung -
Câbles monoconducteurs Einadrige Leitungen
This European Standard was approved by CENELEC on 2008-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50264-2-1:2008 E
Foreword
This European Standard was prepared by Working Group 12, Railway cables, of the Technical Committee
CENELEC TC 20, Electric cables, as part of the overall programme of work in the Technical Committee
CENELEC TC 9X, Electrical and electronic applications for railways.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50264-2-1 on
2008-03-01.
This European Standard supersedes EN 50264-2:2002.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2009-03-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2011-03-01
with the EN have to be withdrawn
__________
– 3 – EN 50264-2-1:2008
Contents
Page
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Definitions . 7
4 Rated voltage . 7
5 Marking and identification . 7
5.1 Marking of cable . 7
5.2 Core identification. 8
5.3 Sheath . 8
6 Construction of cables . 8
6.1 General . 8
6.2 Conductor . 8
6.3 Conductor screening . 8
6.4 Separator . 8
6.5 Insulation system. 8
6.6 Sheath . 9
6.7 Constructional components . 9
7 Tests . 15
7.1 Definitions relating to tests . 15
7.2 Conductor resistance . 15
7.3 Voltage test . 15
7.4 Insulation resistance . 15
7.5 Dielectric strength. 15
7.6 Spark test . 16
7.7 DC stability . 16
7.8 Surface resistance. 16
7.9 Ageing test . 16
7.10 Hot set test . 17
7.11 Compatibility . 17
7.12 Water absorption on sheath . 17
7.13 Ozone resistance . 17
7.14 Mineral oil resistance . 18
7.15 Fuel resistance . 18
7.16 Acid and alkali resistance . 19
7.17 Bending test at low temperature (cables with OD ≤ 12,5 mm) . 19
7.18 Cold elongation test (cables with OD > 12,5 mm) . 19
7.19 Impact test at low temperature . 20
7.20 Reaction to fire – Cable . 20
7.21 Reaction to fire – Components . 20
Annex A (normative) Code designation . 24
Bibliography . 25
Tables
Table 1 – General data – Cable type (0,6/1 kV unsheathed) . 11
Table 2 – General data – Cable type (1,8/3 kV unsheathed) . 12
Table 3 – General data – Cable type (1,8/3 kV sheathed) . 13
Table 4 – General data – Cable type (3,6/6 kV sheathed) . 14
Table 5 – Schedule of tests for cables . 21
– 5 – EN 50264-2-1:2008
Introduction
The EN 50264 series covers a range of cables, based upon halogen free materials, for use in railway rolling
stock. It is divided into 5 parts under the generic title “Railway applications - Railway rolling stock power and
control cables having special fire performance”:
– Part 1 General requirements;
– Part 2-1 Cables with crosslinked elastomeric insulation – Single core cables;
– Part 2-2 Cables with crosslinked elastomeric insulation – Multicore cables;
– Part 3-1 Cables with crosslinked elastomeric insulation with reduced dimensions – Single core
cables;
– Part 3-2 Cables with crosslinked elastomeric insulation with reduced dimensions – Multicore cables.
Information regarding selection and installation of cables, including current ratings can be found in EN 50355
and EN 50343. The procedure for selection of cable cross-sectional area, including reduction factors for
ambient temperature and installation type, is described in EN 50343.
Special test methods referred to in EN 50264 are given in EN 50305.
The cables in EN 50264-2-1 may also be used in EN 50264-2-2 to build up multicore sheathed cables.
Part 1, “General requirements”, contains a more extensive introduction to EN 50264, and should be read in
conjunction with this Part 2-1.
1 Scope
EN 50264-2-1 specifies requirements for, and constructions and dimensions of, single core cables of the
following types and voltage ratings:
• 0,6/1 kV unscreened, unsheathed (1 mm² to 400 mm²);
• 1,8/3 kV unscreened, unsheathed (1,5 mm² to 400 mm²);
• 1,8/3 kV unscreened, sheathed (1,5 mm² to 400 mm²);
• 3,6/6 kV unscreened, sheathed (2,5 mm² to 400 mm²).
All cables have class 5 tinned copper conductors to EN 60228, halogen-free insulation and halogen-free
sheath. They are for use in railway rolling stock as fixed wiring, or wiring where limited flexing in operation is
encountered. The requirements provide for a continuous conductor temperature not exceeding 90 °C and a
maximum temperature for short circuit conditions of 200 °C based on a duration of 5 s.
Under fire conditions the cables exhibit special performance characteristics in respect of maximum
permissible flame propagation (flame spread) and maximum permissible emission of smoke and toxic gases.
EN 50264-2-1 should be read in conjunction with Part 1 “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.
EN 10002-1 Metallic materials – Tensile testing – Methods of test at ambient temperature
EN 50264-1:2008 Railway applications – Railway rolling stock power and control cables having
special fire performance – Part 1: General requirements
EN 50266-2-4 Common test methods for cables under fire conditions – Test for vertical flame
spread of vertically-mounted bunched wires or cables –
Part 2-4: Procedures – Category C
EN 50266-2-5 Common test methods for cables under fire conditions – Test for vertical flame
spread of vertically-mounted bunched wires or cables –
Part 2-5: Procedures – Small cables – Category D
EN 50305:2002 Railway applications – Railway rolling stock cables having special fire performance
– Test methods
EN 60228 Conductors of insulated cables (IEC 60228)
EN 60332-1-2 Tests on electric and optical fibre cables under fire conditions –
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)
EN 60811-1-1:1995 Insulating and sheathing materials of electric and optical cables – Common test
methods – Part 1-1: General application – Measurement of thickness and overall
dimensions – Tests for determining the mechanical properties
(IEC 60811-1-1:1993)
– 7 – EN 50264-2-1:2008
EN 60811-1-2:1995 Insulating and sheathing materials of electric cables – Common test methods –
Part 1-2: General application – Thermal ageing methods
(IEC 60811-1-2:1985 + A1:1989 + corr. May 1986)
EN 60811-1-3:1995 Insulating and sheathing materials of electric and optical cables – Common test
methods – Part 1-3: General application – Methods for determining the density –
Water absorption tests – Shrinkage test (IEC 60811-1-3:1993)
EN 60811-1-4:1995 Insulating and sheathing materials of electric and optical cables – Common test
methods – Part 1-4: General application – Tests at low temperature
(IEC 60811-1-4:1985 + A1:1993 + corr. May 1986)
EN 60811-2-1:1998 Insulating and sheathing materials of electric and optical cables – Common test
methods – Part 2-1: Methods specific to elastomeric compounds – Ozone
resistance, hot set and mineral oil immersion tests
(IEC 60811-2-1:1998)
EN 61034-2 Measurement of smoke density of cables burning under defined conditions –
Part 2: Procedure and requirements (IEC 61034-2)
HD 308 Identification of cores in cables and flexible cords
3 Definitions
For the purposes of this document, the terms and definitions given in EN 50264-1 apply.
4 Rated voltage
The rated voltage for single-core insulated cables shall be as follows:
a) unsheathed: 0,6/1 kV; 1,8/3 kV;
b) sheathed: 1,8/3 kV; 3,6/6 kV.
5 Marking and identification
5.1 Marking of cable
Cables shall be marked with the following:
• manufacturer’s name;
• EN reference;
• voltage rating (U );
o
• conductor size;
• a code designation according to Annex A.
An example of a complete mark is:
XYZ EN 50264-2-1 1800 V 400 FF
The marking shall conform to the requirements of EN 50264-1, Clause 5.
5.2 Core identification
The core insulation of all cables shall be black unless otherwise specified. If a colour other than black is
specified it shall be a colour in accordance with HD 308. The colour shall be on the surface or throughout the
insulation.
The colour shall be clearly identifiable and durable. Durability shall be checked by the test given in
EN 50305, 10.1.
Conformity with these requirements shall be verified by visual examination.
5.3 Sheath
The sheath shall be black unless otherwise specified.
6 Construction of cables
6.1 General
The cable shall conform to the applicable general requirements given in EN 50264-1 and to the specific
requirements of this part.
Conformity with the requirements shall be checked by inspection and by the tests given in Table 5.
The cable dimensions shall be as given in Tables 1 to 4 as appropriate to the cable type.
6.2 Conductor
Conductors shall be tin-coated annealed copper, class 5, according to EN 60228.
When tested in accordance with EN 10002-1 the minimum average elongation of the wires from the
conductor shall be 15 %, with a minimum value of 10 % for any individual wire.
NOTE It is not necessary to test every individual wire. 5 % of wires or 10 wires, whichever is the least number, should be selected at
random.
6.3 Conductor screening
For cables in Table 4 conductor screening shall be as given in EN 50264-1, 6.1.6.
6.4 Separator
6.4.1 A separator may be used over the conductor if the cable construction does not include a conductor
screen.
6.4.2 A separator may be included between the insulation and the sheath.
6.5 Insulation system
The insulation shall be one or more extruded materials as defined in EN 50264-1 applied so as to meet the
requirements of EI 101 to EI 105.
– 9 – EN 50264-2-1:2008
For single-core unsheathed and sheathed cable:
EI 101 low temperature resistant, oil resistant;
EI 102 extra low temperature resistant, oil resistant;
EI 103 low temperature resistant, extra oil and fuel resistant;
EI 104 extra low temperature resistant, extra oil and fuel resistant.
For sheathed cables:
EI 105 extra low temperature resistant, non oil resistant.
EI 105 may be used as the inner layer of a multilayer insulation system.
To claim extra low temperature performance both insulation and sheath shall be extra low temperature
resistant.
The insulation shall be applied to meet the requirements of EN 50264-1, 6.2.
The insulation thickness shall conform to the specified value g
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