BRITISH STANDARD BS EN 50290 2 26 2002 Communication cables — Part 2 26 Common design rules and construction — Halogen free flame retardant insulation compounds The European Standard EN 50290 2 26 200[.]
Trang 1BRITISH STANDARD BS EN
50290-2-26: 2002
Communication
cables —
Part 2-26:Common design rules and
construction — Halogen free flame
retardant insulation compounds
The European Standard EN 50290-2-26:2002 has the status of a
British Standard
ICS 29.035.20; 33.120
Trang 2BS EN 50290-2-26:2002
This British Standard, having
been prepared under the
direction of the
Electrotechnical Sector Policy
and Strategy Committee, was
published under the authority
of the Standards Policy and
Strategy Committee on
15 April 2002
© BSI 15 April 2002
ISBN 0 580 39476 X
National foreword
This British Standard is the official English language version of
EN 50290-2-26:2002 It supersedes BS 7878-6:1997 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee EPL/46, Cables, wires and waveguides, RF connectors and accessories for communication and signalling, to Subcommittee EPL/46/1, Communication cables, which has the responsibility to:
A list of organizations represented on this subcommittee can be obtained on request to its secretary
Cross-references
The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic
Catalogue
A British Standard does not purport to include all the necessary provisions of
a contract Users of British Standards are responsible for their correct application
Compliance with a British Standard does not of itself confer immunity from legal obligations.
— aid enquirers to understand the text;
— present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
— monitor related international and European developments and promulgate them in the UK
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover
The BSI copyright date displayed in this document indicates when the document was last issued
Amendments issued since publication
Trang 3EUROPEAN STANDARD EN 50290-2-26
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2002
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 50290-2-26:2002 E
ICS 29.035.20; 33.120.10 Supersedes HD 624.6 S1:1995
English version
Communication cables Part 2-26: Common design rules and construction – Halogen free flame retardant insulation compounds
Câbles de communication
Partie 2-26: Règles de conception
communes et construction –
Mélanges pour enveloppes
isolantes sans halogène et avec
propagation retardée de flamme
Kommunikationskabel Teil 2-26: Gemeinsame Regeln für Entwicklung und Konstruktion -Halogenfreie flammwidrige
Isoliermischungen
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.
Trang 4EN 50290-2-26:2002 2
-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 50290-2-26 on 2001-11-01
This European Standard supersedes HD 624.6 S1:1995
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
– latest date by which the national standards conflicting
Annexes designated "normative" are part of the body of the standard
In this standard, annexe A is 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
Trang 5
- 3 - EN 50290-2-26:2002
1 Scope
This Part 2-26 of EN 50290 gives specific requirements for halogen free flame retardant insulation 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 60811-2-1:1998 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 60811-3-1:1995 Insulating and sheathing materials of electric and optical cables - Common
test methods Part 3-1: Methods specific to PVC compounds - Pressure test
at high temperature - Tests for resistance to cracking (IEC 60811-3-1:1985 + corr May 1986)
HD 405.3 S1:1993 Tests on electric cables under fire conditions Part 3: Tests on bunched wires
or cables ( IEC 60332-3:1992)
IEC 60250:1969 Recommended methods for the determination of the permittivity and dielectric
dissipation factor of electrical insulating materials at power, audio and radio frequencies including metre wavelengths
IEC 60754-2:1991
+ A1:1997
Test on gases evolved during combustion of materials from cables -Determination of degree of acidity of gases by measuring pH and conductivity
3 Requirements
In case of specific applications, additional performances could be needed Relevant test methods and requirements shall be included in the detail specification of the cables
Trang 6EN 50290-2-26:2002 4
-Table 1 - Halogen free flame retardant insulation compounds Characteristics Test method Unit Grades
Cross linked insulation
Thermoplastic insulation
1 Maximum rated temperature at cable for
which the compound can be used
2 Mechanical characteristics
2.1
2.11
2.12
In state of delivery
Tensile strength
- median, min
Elongation at break
- median, min
EN 60811-1-1 9.1
MPa
%
10 125
9
125 2.2
2.21
After ageing
Ageing conditions
- temperature
- duration
Tensile strength
- variation, max
EN 60811-1-2 8.1
° C h
%
135 ± 2
7 x 24
± 30
100 ± 2
7 x 24
± 30 2.22 Elongation at break
- median, min
- variation, max
%
1)
± 40
3 Heat shock
Test conditions
- temperature
- duration
Result to be obtained
EN 60811-3-1 9.1
° C h
Not applicable
-130 ± 2 1
No crack
4 Behaviour at low temperature
Bending at low temperature
Test conditions
- temperature
Result to be obtained
EN 60811-1-4 8.1
° C - 15 ± 2
No crack
- 15 ± 2
No crack
clause 10 Test conditions
- sample length
- temperature
- duration
Result to be obtained, max
mm
° C h
%
200 100 1 4
200 100 1 4
6 Pressure at high temperature
Test conditions
- temperature
- duration (for all values of cable diameter)
Result to be obtained
- depth of indentation
median, max
EN 60811-3-1 8.1
° C h
%
Not applicable
-80 ± 2 4 50
1) Provisional value
Trang 7- 5 - EN 50290-2-26:2002
Table 1 (continued) Characteristics Test method Unit Grades
Cross linked insulation
Thermoplastic insulation
9 Smoke opacity (see note 2)
consideration
11 Volume resistivity, min
- at maximum rated temperature at cable
- at 20 ° C
Test conditions
- sample length, min
- immersion duration
m h
108 (provisional value)
1010 (provisional value)
5 2
108 (provisional value)
1010 (provisional value)
5 2
(Under consideration)
(Under consideration) 14
14.1
14.2
Hot set test
Test conditions
- temperature
- duration
- load
Result to be obtained
- elongation, max
- permanent set, max
EN 60811-2-1 9
° C min N/cm2
%
%
200 ± 3 15 20
175 25
Not applicable
NOTE 1 Oxygen index measurement has been found to be a suitable indicator to guide selection and monitoring of materials used in
cables which have to meet the fire performance tests specified in the relevant cable specification.
NOTE 2 For selection of materials used in cables, IEC 60695-6 may be considered.
NOTE 3 When required the dielectric constant and dissipation factor, shall be measured at 1 MHz, and at other required values Typical values are under consideration.
Trang 8EN 50290-2-26:2002 6
-Annex A
(normative)
Volume resistivity
This test shall be made on insulated conductor sample
The sample shall be immersed in water previously heated to the specified temperature, a length of about 0,25 m at each end of the sample being kept above the water
A D.C voltage of between 80 V and 500 V shall be then applied between the conductor and the water
The insulation resistance shall be measured 1 min after application of the voltage
- The volume resistivity shall be calculated from the measured insulation resistance by the following formula:
r= 2 Rp
log D d
e
l
where
r = volume resistivity, in W meters
R = measured insulation resistance, in W
l = length of the sample, in meters
D = outer diameter of the insulation, in mm
d = inner diameter of the insulation, in mm
Trang 9blank
Trang 10BS EN
50290-2-26:
2002
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