EN 50290-2-24:2002
(Main)Communication cables - Part 2-24: Common design rules and construction - PE sheathing
Communication cables - Part 2-24: Common design rules and construction - PE sheathing
This Part 2-24 of EN 50290 gives specific requirements for PE sheathing compounds used in communication cables. It is to be read in conjunction with Part 2-20 of EN 50290.
Kommunikationskabel - Teil 2-24: Gemeinsame Regeln für Entwicklung und Konstruktion - PE-Mantelmischungen
Câbles de communication - Partie 2-24: Règles de conception communes et construction - Polyéthylène pour gainage
Communication cables - Part 2-24: Common design rules and construction: PE sheating (Note: Applies only in conjunction with EN 50290-2-20)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2002
1DGRPHãþD
SIST HD 624.4 S1:1997
Communication cables - Part 2-24: Common design rules and construction: PE
sheating (Note: Applies only in conjunction with EN 50290-2-20)
Communication cables -- Part 2-24: Common design rules and construction - PE
sheathing
Kommunikationskabel -- Teil 2-24: Gemeinsame Regeln für Entwicklung und
Konstruktion - PE-Mantelmischungen
Câbles de communication -- Partie 2-24: Règles de conception communes et
construction - Polyéthylène pour gainage
Ta slovenski standard je istoveten z: EN 50290-2-24:2002
ICS:
29.035.20 3ODVWLþQLLQJXPHQLL]RODFLMVNL Plastics and rubber insulating
PDWHULDOL materials
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50290-2-24
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2002
ICS 29.035.20; 33.120.10 Supersedes HD 624.4 S1:1996
English version
Communication cables
Part 2-24: Common design rules and construction –
PE sheathing
Câbles de communication Kommunikationskabel
Partie 2-24: Règles de conception Teil 2-24: Gemeinsame Regeln
communes et construction – für Entwicklung und Konstruktion –
Polyéthylène pour gainage PE-Mantelmischungen
This European Standard was approved by CENELEC on 2001-11-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50290-2-24:2002 E
Foreword
This European Standard was prepared by a joint working group of the Technical Committees CENELEC
TC 46X, Communication cables, and CENELEC TC 86A, Optical fibres and optical fibre cables.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC
as EN 50290-2-24 on 2001-11-01.
This European Standard supersedes HD 624.4 S1:1996.
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) 2002-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-08-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annexes A, B and C are normative.
This European Standard has been prepared under the European Mandate M/212 given to CENELEC by the
European Commission and the European Free Trade Association.
_________
- 3 - EN 50290-2-24:2002
1 Scope
This Part 2-24 of EN 50290 gives specific requirements for PE sheathing compounds used in
communication cables.
It is to be read in conjunction with Part 2-20 of EN 50290.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
to this European Standard only when incorporated in it by amendment or revision. For undated references
the latest edition of the publication referred to applies (including amendments).
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)
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 + corr. May 1986 + A1:1989)
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 + corr. May 1986 + A1:1993)
EN 60811-4-1:1995 Insulating and sheathing materials of electric cables - Common test methods
- - Part 4: Methods specific to polyethylene and polypropylene compounds - -
Section 1: Resistance to environmental stress cracking - Wrapping test after
thermal ageing in air - Measurement of the melt flow index - Carbon black
and/or mineral content measurement in PE (IEC 60811-4-1:1985)
EN 60811-4-2:1999 Insulating and sheathing materials of electric and optical fibre cables -
Common test methods - - Part 4: Methods specific to polyethylene and
polypropylene compounds Section 2: Tensile strength and elongation at break
after pre-conditioning - Wrapping test after thermal ageing in air -
Measurement of mass increase – Long - term stability test - Test method for
copper - catalysed oxidative degradation
(IEC 60811-4-2:1990, mod.)
3 Requirements
In case of specific applications, additional performances could be needed. Relevant test methods and
requirements shall be included in the detail specifications of the cables.
Table 1 - Black PE sheathing compounds
1)
Test method Unit Grades
Characteristics
LD/MD HD LLD
2)
1 Maximum rated temperature at ° C 70 80 80
cable for which the compound can
be used
1)
2 Density EN 60811-1-3 g/cm � 0,940 � 0,940 � 0,940
(without carbon black) clause 8
1)
3 Melt flow index EN 60811-4-1 g/10 min
� 0,4 � 1,0 � 2,0
3)
clause 10
� 2,5
(see note 1)
4 Mechanical characteristics EN 60811-1-1
9.2
4.1 In state of delivery
4.11 Tensile strength MPa 10 18 16
- median, min
4.12 Elongation at break
- median, min % 300 300 500
4.2 After ageing EN 60811-1-2
8.1
Ageing conditions
- temperature ° C 100 ± 2 100 ± 2 100 ± 2
- duration h 24 x 10 24 x 10 24 x 10
Elongation at break
- median, min % 300 300 500
3)
5 Shrinkage EN 60811-1-3
clause 11
Test conditions
- sample length mm 200 200 200
(if not otherwise specifed)
4) 4) 4)
- temperature ° C
4) 4) 4)
- duration h
Result to be obtained
4) 4) 4)
- shrinkage, max %
1) to be given by the supplier
2) 80 °C for MD
3) for special application
4) in the relevant cable specification
- 5 - EN 50290-2-24:2002
Table 1 - Black PE sheathing compounds (Cont'd)
1)
Characteristics Test method Unit Grades
LD/MD HD LLD
6 Performances after Annex A
pre-conditioning
(for sheath in direct contact with
filling compound)
Test conditions
- temperature ° C 60/70 ± 2 60/70 ± 2 60/70 ± 2
- duration h 7 x 24 7 x 24 7 x 24
6.11 Result to be obtained
Tensile strength MPa 10 18 16
- median, min
6.12 Elongation at break % 300 300 500
- median, min
5)
7 Carbon black content EN 60811-4-1 % 2,5 ± 0,5 2,5 ± 0,5 2,5 ± 0,5
clause 11
5)
8 Carbon black dispersion Annex B To meet To meet To meet
EN 60811-4-1
5)
9 Stress cracking To meet To meet To meet
clause 8
Procedure B
(see note 2)
5)
For inner sheath applications, non black PE compounds can be used, then items 7, 8, 9 may not apply.
NOTE 1 If required, MFI may be measured on sheath with other values to be specified.
NOTE 2 Stress cracking test on raw material may not be sufficient to guarantee a stress cracking performance on finished product.
Therefore an additional test has to be performed either on complete cable or on a piece of sheath taken from complete cable, in accordance
with the test methods described in annex C.
Table 2 - Coloured PE sheathing compounds
1)
Characteristics Test method Unit Grades
LD/MD HD LLD
2)
1 Maximum rated temperature at ° C 70 80 80
cable for which the compound can
be used
1)
2 Density EN 60811-1-3 g/cm
� 0,940 � 0,940 � 0,940
clause 8
1)
3 Melt flow index EN 60811-4-1 g/10 min
� 0,4 � 1,0 � 2,0
3)
clause 10
� 2,5
(see note 1)
4 Mechanical characteristics EN 60811-1-1
9.2
4.1 In state of delivery
4.11 Tensile strength MPa 10 18 16
- median, min
4.12 Elongation at break
- median, min % 300 300 500
4.2 After ageing EN 60811-1-2
8.1
Ageing conditions
- temperature ° C 100 ± 2 100 ± 2 100 ± 2
- duration h 24 x 10 24 x 10 24 x 10
Elongation at break
- median, min % 300 300 500
3)
5 Shrinkage EN 60811-1-3
clause 11
Test conditions
- sample length
(if not otherwise specifed) mm 200 200 200
- temperature
4) 4) 4)
- duration ° C
4) 4) 4)
h
Result to be obtained
- shrinkage, max 4) 4) 4)
%
1)
to be given by the supplier on the basic resin
2)
80 °C for MD
3)
for special application
4)
in the relevant cable specification
- 7 - EN 50290-2-24:2002
Table 2 - Coloured PE sheathing compounds (Cont'd)
1)
Characteristics Test method Unit Grades
LD/MD HD LLD
6 Performances after Annex A
pre-conditioning
(for sheath in direct contact with
filling compound)
Test conditions
- temperature ° C 60/70 ± 2 60/70 ± 2 60/70 ± 2
- duration h 7 x 24 7 x 24 7 x 24
Result to be obtained
Tensile strength MPa 10 18 16
- median, min
Elongation at break % 300 300 500
- median, min
EN 60811-4-1
5)
7 Stress cracking To meet To meet To meet
clause 8
Procedure B
(see note 2)
5)
For inner sheath applications, item 7 may not apply – Natural grades can be used
NOTE 1 If required, MFI may be measured on sheath with other values to be specified.
NOTE 2 Stress cracking test on raw material may not be sufficient to guarantee a stress cracking performance on finished product.
Therefore an additional test has to be performed either on complete cable or on a piece of sheath taken from complete cable, in accordance
with the test methods described in annex C.
Guidance to use:
Natural or coloured polyolefin cable sheaths, containing conventional antioxidant stabilisers degrade rapidly
when subjected to natural daylight weathering through photocatalysed oxidation (actinic degradation).
Degradation is manifested by discolouration of the sheath followed immediately by loss of mechanical
properties and spontaneous cracking.
This ageing process is accelerated in situations where the sheath is physically stressed, for example at
sharp bends. Under temperate European climates failure can occur within two years of exposure. Ageing
will not only occur on installed cables but also on cables stored externally on drums or reels where the
cables have been inadequately protected from solar radiation.
Ultraviolet stabilisation systems may be incorporated in the sheath compound to extend the induction period
before the onset of failure. Such systems will permit prolonged external storage of cables but their
performance does not approach that of conventional sheaths containing a minimum of 2 % of carbon black.
Consequently they are unsuitable for external use where long service lives are required, especially where
the cable will be installed in exacting climatic conditions such as aerial cables
Annex A
(normative)
Performances after pre-conditioning
To perform the test, use EN 60811-4-2 with the following modifications :
1 Scope - Second paragraph
Replace ".elongation at break." by ".tensile strength and elongation at break.".
6 Pre-conditioning
Replace the existing title by the following new title:
6 Conditioning
8 Elongation at break after pre-conditioning
Replace the existing title and text of this clause by the following new title and text:
8 Tensile strength and elongation at break after pre-conditioning
8.1 General
This text is intended for filled cables for polyolefin insulations with a wall thickness of more than 0,8 mm and
for polyolefin sheaths in direct contact with filling compound.
8.2 Pre-conditioning procedure
A sample of complete cable of sufficient length shall be pre-conditioned in air (i.e. suspended in an oven).
The duration of the test and the temperature of the air maintained continuously shall be as follows:
- 7 x 24 h at 60 °C for filling compound having a nominal drop-point above 50 °C and up to an including
70 °C.
- 7 x 24 h at 70 °C for filling compound having a nominal drop-point above 70 °C.
After pre-conditioning, the cable sample shall be left at ambient temperature for at least 16 h without being
exposed to direct sunlight. Then the sheath and cores to be tested shall be taken from the cable and shall
be cleaned by suitable means.
8.3 Tensile strength and elongation tests after pre-conditioning
Tensile strength and/or elongation tests, with respect to requirements in the cable standard, on test pieces
according to 8.2 shall be performed in accordance with clause 9 of EN 60811-1-1 without any further ageing
treatment.
1)
The modifications listed are intended for revision of EN 60811-4-2 (IEC 60811-4-2).
- 9 - EN 50290-2-24:2002
9 Wrapping test after pre-conditioning
9.2 Test procedure
Replace the existing title and text of the subclause by the following new title and text:
9.2 Pre-conditoning procedure
The pre-conditiong shall be carried out in accordance with 8.2 of this standard. Then the cores to be t
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