EN 50290-2-1:2005

SLOVENSKI SIST EN 50290-2-1:2005

STANDARD
november 2005
Komunikacijski kabli – 2-1. del: Splošna pravila za načrtovanje in konstrukcijo
Communication cables - Part 2-1: Common design rules and construction
ICS 33.120.10 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 50290-2-1
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2005

ICS 33.120.10
English version
Communication cables
Part 2-1: Common design rules and construction

Câbles de communication Kommunikationskabel
Partie 2-1: Règles de conception Teil 2-1: Allgemeine Entwurf-
communes et construction und Konstruktionsregeln

This European Standard was approved by CENELEC on 2004-10-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50290-2-1:2005 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 46X, Communication
cables.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50290-2-1 on
2004-10-01.
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) 2005-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-10-01
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 50290-2-1:2005
Contents
Introduction .5
1 Scope.6
2 Normative references.6
3 Definitions.6
4 Common design rules.6
4.1 Materials.6
4.1.1 Conductor materials.6
4.1.2 Optical fibres.8
4.1.3 Taping / fillers.8
4.1.4 Insulating and sheathing materials.8
4.1.5 Messenger wires.8
4.1.6 Armour.9
4.2 Cable make-up.10
4.2.1 General design.10
4.2.2 Sheathing .10
4.2.3 Marking.10
5 Register of symbols used.11
6 Material constants.13
6.1 Table of material constants relating to dielectric and sheath and their values
for different materials .13
6.2 Tables of material constants relating to conductors.14
6.3 Construction constants.15
6.3.1 Table of construction constants relating to inner conductor.15
6.3.2 Table of construction constants relating to braided outer conductors and screens.15
6.4 Braid wire dimensions .15
6.5 Attenuation factors .16
6.6 Maximum permissible input power/ current carrying capacity.16
6.6.1 Coaxial cables.16
6.6.2 Balanced cables.18
7 Standard values of characteristic impedance and outer diameter of dielectric for
coaxial cables .18
7.1 Impedance of coaxial cables.18
7.2 Nominal diameters over dielectric of coaxial cables .18
8 Coaxial cable construction details .20
8.1 General.20
8.2 Inner conductor.20
8.3 Stranded inner conductor.20
8.4 Braided outer conductor.21
8.5 Medium between outer conductor and screen .21
8.6 Braided screen .21
8.7 Sheath.22
8.8 Attenuation.22
8.9 Nominal characteristic impedance z and capacitance c per unit length.23
o 2
9 Standard values of characteristic impedance and outer diameter of dielectric
for symmetrical cables.23
9.1 Impedance of symmetrical cables.23
10 Symmetrical cable construction details .24
10.1 Attenuation.25

11 Common characteristics.25
11.1 Weight calculation .25
12 Calculation of electrical properties.26
12.1 DC resistance of conductors and screen, per unit length.26
12.2 Permissible voltages.26
12.2.1 Test voltage, dielectric, u .26
t
12.2.2 Discharge test voltage, dielectric, u .27
d
12.2.3 Test voltage, sheath.27

- 5 - EN 50290-2-1:2005
Introduction
EN 50290-2-1 series gives directly or by reference all common requirements for communication
cables.
It is completed by generic, sectional, family and detail specifications, as appropriate, to describe in a
detailed manner each type of cables with its specific characteristics.
EN 50290, which is the basic reference standard for communication cables, consists of the following
parts:
– Part 1-1 General
– Part 1-2 Definitions
– Part 2-1 Common design rules and construction
– Part 2-1X Materials
– Part 3 Quality assessment
– Part 4-1 Environmental conditions and safety aspects
– Part 4-2 Guide for use
The test methods are described in the basic reference standard EN 50289, Communication cables -
Specifications for test methods, which consists of the following parts:
– Part 1-X Electrical test methods
– Part 2-X Transmission and optical test methods
– Part 3-X Mechanical test methods
– Part 4-X Environmental test methods

1 Scope
This European Standard harmonises the standardisation of symmetrical, coaxial and optical cables
used for the infrastructure of communication, multimedia and control networks. Most of the cables
covered by this European Standard are primarily intended to be used in IT networks. However, they
can also be used for other applications with the exception of those which presume a direct
connection to the mains electricity supply.
EN 50290-2-1 gives the common rules for the design and construction of symmetrical, coaxial and
optical cables used for the infrastructure of communication and control networks.
It is to be used in conjunction with EN 50290-1-1 and is completed by generic, sectional, family and
detail specifications, as appropriate, to describe in a detailed manner each type of cable with its
specific characteristics.
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 50290-1-2 Communication cables - Part 1-2: Definitions
EN 50290-2-23 Part 2-23: Materials - PE insulation
EN 50290-2-24 Part 2-24: Materials - PE sheathing
EN 50290-2-25 Part 2-25: Materials - Polypropylene insulation compounds
EN 50290-2-26 Part 2-26: Materials - Halogen free flame retardant insulation compounds
EN 50290-2-27 Part 2-27: Materials - Halogen free flame retardant thermoplastic sheathing
compounds
IEC 60304 Standard colours for insulation for low-frequency cables and wires
IEC 60028 International standard of resistance for copper
IEC 60793-1 Optical fibres - Part 1: Generic specification.
3 Definitions
For the purpose of this standard, the definitions given in EN 50290-1-2 apply.
4 Common design rules
4.1 Materials
4.1.1 Conductor materials
4.1.1.1 Wires and inner conductors
The construction and material of wires or inner conductor shall be specified in the relevant
specification.
- 7 - EN 50290-2-1:2005
The conductor shall be either solid or stranded annealed copper. The conductivity of the copper shall
be in accordance with IEC 60028.
Alternatively, the conductor shall consist of copper-clad steel. The layer of copper cladding shall be
continuous, and shall adhere to the steel; the cross-section shall be circular, such that the maximum
resistance of the clad conductor shall not exceed that given for copper conductor, in accordance with
IEC 60028, by more than a factor of 4,8, 3,5 and 2,8, respect
...