IEC 62012-1:2002

Multicore and symmetrical pair/quad cables for digital communications to be used in harsh environments - Part 1: Generic specification

specifies the definitions and test methods, when used in harsh environment, of symmetrical pair and quad cables used in digital communication systems such as ISDN, local area networks and data communication systems. gives guidance concerning the design and testing of these cables.

Câbles multiconducteurs à paires symétriques et quartes pour transmissions numériques utilisés en environnements sévéres - Partie 1: Spécification générique

spécifie, dans le cas d'utilisation en environnements sévères, les définitions et les méthodes d'essai pour les câbles multiconducteurs à paires symétriques et quartes utilisés dans les systèmes en transmissions numériques tels que RNIS (ISDN), les réseaux locaux et les systèmes de transmission de données. donne des lignes directrices pour la conception et la vérification de ces câbles

General Information

• Status: Published
• Publication Date: 23-Jun-2002
• ICS: 33.120.20 - Wires and symmetrical cables
• Technical Committee: SC 46C - Wires and symmetric cables
• Drafting Committee: WG 7 - TC 46/SC 46C/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 24-Jun-2002
• Completion Date: 31-Jul-2002

Overview - IEC 62012-1:2002 (Multicore and symmetrical pair/quad cables)

IEC 62012-1:2002 is the IEC generic specification for multicore and symmetrical pair/quad cables intended for digital communications in harsh environments. The standard defines terminology and test methods for cables used in ISDN, local area networks (LANs) and other data communication systems, and gives guidance on design and testing to ensure reliable performance under fire, temperature extremes, vibration, chemical exposure and radiation.

Key topics and technical requirements

• Scope and definitions: Applies to symmetrical pair and quad cable constructions for digital systems; references IEC vocabularies and related cable standards.
• Materials and construction: Guidance on conductor, insulation and sheath materials and identification and finished-cable requirements.
• Test methods: Comprehensive test regimes grouped by:
  • Electrical tests (signal transmission characteristics)
  • Mechanical and dimensional tests (tensile, bending, crushing, vibration)
  • Environmental tests (fire resistance, smoke density, halogen acid gas)
  • Temperature tests (performance across temperature ranges)
  • Chemical tests and radiation tests (gamma, beta, alpha exposure)
• Fire and smoke testing: Includes a detailed horizontal integrated fire-test method (Annex A) plus procedures for smoke density and gas emission measurement (IEC 61034, IEC 60754 series).
• Radiation and circuit integrity: Tests and classifications to evaluate cable survivability and signal integrity after exposure to specified dose/dose-rate combinations.

Practical applications

• Specification and acceptance testing of cables for:
  • Industrial sites with corrosive/abrasive conditions
  • Transportation, energy and military installations with high fire-risk zones
  • Nuclear or high-radiation facilities requiring radiation-hardened communications
  • Critical infrastructure and data centers where circuit integrity during adverse events is required
• Useful for product development, qualification testing, procurement and safety compliance.

Who should use this standard

• Cable designers and manufacturers developing harsh-environment data cables
• Test laboratories and certification bodies performing environmental and fire testing
• System integrators, procurement/specification engineers and safety officers writing technical requirements for communications wiring
• Regulatory bodies or asset owners specifying cable performance for critical systems

Related standards

Normative references cited include key IEC documents used alongside IEC 62012-1, for example:

• IEC 60068-2 (environmental testing), IEC 60332 and IEC 60332-3 (fire tests), IEC 61034 (smoke density), IEC 60754-1 (halogen acid gas), and IEC 60811 series (material tests).

By following IEC 62012-1:2002, stakeholders can ensure multicore and symmetrical pair/quad cables meet robust test criteria for reliable digital communication in harsh and safety-critical environments.

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
62012-1
First edition
2002-06
Multicore and symmetrical pair/quad cables
for digital communications to be used
in harsh environments –
Part 1:
Generic specification
Câbles multiconducteurs à paires symétriques
et quartes pour transmission numérique utilisés
en environnement difficile –
Partie 1: Spécification générique
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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thus ensuring that the content reflects current technology. Information relating to
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by the technical committee which has prepared this publication, as well as the list
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INTERNATIONAL IEC
STANDARD
62012-1
First edition
2002-06
Multicore and symmetrical pair/quad cables
for digital communications to be used
in harsh environments –
Part 1:
Generic specification
Câbles multiconducteurs à paires symétriques
et quartes pour transmission numérique utilisés
en environnement difficile –
Partie 1: Spécification générique
 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XA
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 62012-1  IEC:2002(E)
CONTENTS
FOREWORD.4
INTRODUCTION.5
1 General .6
1.1 Scope.6
1.2 Normative references .6
1.3 Definitions .7
1.4 Environmental considerations.7
2 Materials and cable construction .7
2.1 General remarks.7
2.2 Cable construction.8
2.3 Identification.10
2.4 Finished cable.10
3 Test methods.10
3.1 General remarks.10
3.2 Electrical tests.10
3.3 Mechanical and dimensional measurement tests .10
3.4 Environmental tests.15
3.5 Temperature tests .19
3.6 Chemical tests.22
3.7 Radiation tests .23
Annex A (normative) Horizontal integrated fire-test method.27
A.1 Definitions, symbols and abbreviations .27
A.2 Test environment .27
A.3 Test apparatus.27
A.4 Test specimens.35
A.5 Calibration and maintenance of test equipment.36
A.6 Test specimen preparation.40
A.7 Test procedures.41
A.8 Post-test clean-up and inspection .43
A.9 Calculations.43
A.10 Report .46
Annex B (normative) Method for determining suitability of oxygen analysers for making
heat release measurements .47
B.1 General .47
B.2 Procedure.47
B.3 Additional precautions .47
Annex C (informative) Material information list .48
C.1 Analyser .48
C.2 Fire-test chamber .48

62012-1  IEC:2002(E) – 3 –
C.3 Firebrick .48
C.4 Inside glass panes.48
C.5 Lamp .49
C.6 Recording device .49
C.7 Bi-directional probe.49
C.8 Neutral density filters.49
C.9 Gas calorimeter .49
C.10 Standard insulated conductor (calibration cable).49
Annex D (informative) Brick sizes .50
Bibliography.51
Figure 1 – Fixture for cable crushing test .11
Figure 2 – Bending under tension .12
Figure 3 – Tensile performance measuring apparatus.14
Figure 4 – Example of temperature versus time .22
Figure 5 – Test set up for radiation .25
Figure A.1 – Schematic of the air-inlet chamber.28
Figure A.2 – Schematic of the fire test chamber.30
Figure A.3 – Cross-section of the fire test chamber (Section B-B, Figure A.2) .30
Figure A.4 – Schematic of the exhaust transition .32
Figure A.5 – Smoke measurement system .33
Figure A.6 – Location of exhaust transition, exhaust duct, smoke measurement system
and damper .34
Figure A.7 – Details of ladder cable tray and supports .34
Figure A.8 – Schematic of gas sampling system .36
Figure A.9 – Temperature history of inorganic reinforced cement board at
thermocouple in air (7 m) .39
Table 1 – Requirement for vibration .16
Table 2 – Sock severities.17
Table 3 – Characteristics to be checked versus the frequency range of the application.18
Table 4 – Circuit integrity classes E .19
Table 5 – Total dose/dose rate combinations .26
Table D.1 – Sizes of bricks .50

– 4 – 62012-1  IEC:2002(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL
COMMUNICATIONS TO BE USED IN HARSH ENVIRONMENTS –
Part 1: Generic specification
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62012-1 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors
and accessories for communication and signalling.
The text of this standard is based on the following documents:
FDIS RVD
46C/503/FDIS 46C/535/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62012-1  IEC:2002(E) – 5 –
INTRODUCTION
The cables used for customer premises cabling or other IT cabling may have to work in harsh
environments. This can be in case of fire but also due to conditions of installation in industrial
plant. This standard shall be supplemented by sectional specifications addressing a particular
function as defined in 1.4. Detail specifications will refer to one or several sectional
specifications depending upon the actual design of the cable.

– 6 – 62012-1  IEC:2002(E)
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL
COMMUNICATIONS TO BE USED IN HARSH ENVIRONMENTS –
Part 1: Generic specification
1 General
1.1 Scope
This part of IEC 62012 specifies the definitions and test methods, when used in harsh
environment, of symmetrical pair and quad cables used in digital communication systems
such as ISDN, local area networks and data communication systems. This standard gives
guidance concerning the design and testing of these cables.
1.2 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.
IEC 60028:1925, International standard of resistance for copper
IEC 60050(701), International Electrotechnical Vocabulary (IEV) – Chapter 701: Telecommu-
nications, channels and networks
IEC 60050(704), International Electrotechnical Vocabulary (IEV) – Chapter 704: Transmission
IEC 60050(722), International Electrotechnical Vocabulary (IEV) – Chapter 722: Telephony
IEC 60068-2 (all parts), Environmental testing – Part 2: Tests
IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath –
Part 1: General test and measuring methods
IEC 60304:1982, Standard colours for insulation for low-frequency cables and wires
IEC 60332-1:1993, Tests on electric cables under fire conditions – Part 1: Test on a single
vertical insulated wire or cable
IEC 60332-2:1989, Tests on electric cables under fire conditions – Part 2: Test on a single
small vertical insulated copper wire or cable
IEC 60332-3 (all parts), Tests on electric cables under fire conditions – Part 3: Tests on
bunched wires or cables
IEC 60754-1, Test on gases evolved during combustion of materials from cables – Part 1:
Determination of the amount of halogen acid gas
IEC 60811-1-1:1993, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section 1: Measurement of thickness and
overall dimensions – Tests for determining the mechanical properties

62012-1  IEC:2002(E) – 7 –
IEC 60811-1-3:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Three: Methods for determining the
density – Water absorption tests – Shrinkage test
IEC 60811-1-4:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Four: Tests at low temperature
IEC 61034-1, Measurement of smoke density of cables burning under defined conditions –
Part 1: Test apparatus
IEC 61034-2, Measurement of smoke density of cables burning under defined conditions –
Part 2: Test procedure and requirements
1.3 Definitions
For the purposes of this generic specification, the definitions given in IEC 60050-701, IEC
60050-704, IEC 60050-722 and IEC 61156-1 apply.
1.4 Environmental considerations
The cables shall be designed to perform in one or more of the following environmental
condition.
It is the intention of this standard that any cables defined as compliant with one or more of the
categories referred to in definitions of 1.3 shall also be compliant with the electrical,
mechanical and environmental requirement given below when tested in accordance with
Clauses 3 and 4.
1.4.1 Fire resistance
When subjected to fire according to the test described in 3.4.6, the cables shall be capable of
transmitting the expected signal with or without degradation as described in the detail
specification.
1.4.2 Temperature
When subjected to temperature according to the test described in 3.5, the cables shall be
capable of transmitting the expected signal with or without degradation as described in the
detail specification.
1.4.3 Nuclear radiations (αααα, ββββ, γγγγ)
When subjected to radiations according to the test described in 3.7, the cables shall be
capable of transmitting the expected signal with or without degradation as described in the
detail specification.
1.4.4 Chemical
When subjected to chemical agents accordingly to the test described in 3.6, the cables shall
be capable of transmitting the expected signal with or without degradation as described in the
detail specification.
2 Materials and cable construction
2.1 General remarks
The choice of materials and cable construction shall be suitable for the intended application
and installation of the cable.

– 8 – 62012-1  IEC:2002(E)
2.2 Cable construction
The cable construction shall be in accordance with the details and dimensions given in the
relevant detail cable specification.
2.2.1 Conductor
The conductor may be either solid or stranded. The solid conductor shall be circular in section
and may be plain or metal-coated. Normally, the solid conductor shall be drawn in one piece.
Joints in the solid conductor are permitted, provided that the tensile strength of a joint is not
less than 85 % of the unjointed solid conductor.
When the conductor consists of annealed copper, it shall be uniform in quality and free from
defects. The properties of the copper shall be in accordance with IEC 60028.
The stranded conductor shall consist of strands circular in section and assembled without
insulation between them by concentric stranding or bunched.
The individual strands of the conductor may be plain or metal-coated.
Normally, the individual strands shall be drawn in one piece. Joints in individual strands are
permitted provided that the tensile strength of a joint is not less than 85 % of the tensile
strength of the unjointed individual strand. Joints in the complete stranded conductor are not
permitted unless allowed and specified in the relevant detail cable specification.
2.2.2 Insulation
Conductor insulation shall be composed of one or more suitable dielectric materials. The
insulation may be solid, cellular or composite (e.g. foam skin)
The insulation shall be continuous, having a thickness as uniform as possible.
The insulation shall be applied to fit closely to the conductor. The stripping properties of the
insulation shall be checked in accordance with the method specified in 3.4 of IEC 60189-1. It
shall be possible to strip the insulation from the conductor easily and without damage to the
conductor.
When required the insulated conductors shall be coloured for identification. Colours shall
correspond reasonably with the standard colours shown in IEC 60304.
2.2.3 Colour code
The colour code for insulation is given in the relevant detail cable specification
2.2.4 Cable element
The cable element is
• a single insulated conductor, or
• a pair consisting of two insulated conductors twisted together and designated wire "a" and
wire "b", or
• a quad consisting of four insulated conductors twisted together and designated wire "a",
wire "c", wire "b" and wire "d" in order of rotation.
The choice of the maximum average length of lay in the finished cable shall be made with
respect to the specified crosstalk requirements, handling performance and the pair or quad
integrity.
62012-1  IEC:2002(E) – 9 –
NOTE Forming the element with a variable lay can lead to the infrequent but acceptable occurrence of the
maximum lay being longer than the one that may be specified.
2.2.5 Screening of the cable element
If a screen is required over the pair or quad, it may consist of the following:
a) a metallic tape laminated to a plastic tape;
b) a metallic tape laminated to a plastic tape and a metal-coated or solid drain wire whereby
the metal tape is in contact with the drain wire;
c) plain or metal-coated copper braid;
d) a metallic tape laminated to a plastic tape and a metal-coated or plain braid.
Care should be taken when putting dissimilar metals in contact with each other. Coatings or
other methods of protection may be necessary to prevent galvanic interaction.
A protective buffer (wrapped or extruded) may be applied under and/or over the screen.
2.2.6 Cable make-up
The cable elements may be laid up in concentric layers or in unit construction. The cable core
may be protected by a layer (wrappings of a non-hygroscopic tape or extruded).
NOTE Fillers may be used to maintain a circular formation.
2.2.7 Screening of the cable core
The cable core may be screened by
a) a metallic tape laminated to a plastic tape which is bonded to the sheath;
b) a metallic tape laminated to a plastic tape and a metal-coated, stranded or plain metallic
drain wire whereby the metal tape is in contact with the drain wire;
c) plain or metal-coated copper braid;
d) a metallic tape laminated to a plastic tape and a metal-coated or plain metallic braid;
e) plain metallic tape;
f) a metallic tube.
Care should be taken when putting dissimilar metals in contact with each other. Coatings or
other methods of protection may be necessary to prevent galvanic interaction.
A protective buffer (wrapped or extruded) may be applied under and/or over the screen.
2.2.8 Sheath
Where a sheath is required, it shall have adequate mechanical strength and elasticity.
The sheath shall be continuous, having a thickness as uniform as possible. The minimum
thickness of the sheath shall be determined in accordance with the method specified in
2.2.1.2 of IEC 60189-1.
The sheath shall be applied to fit closely to the core of the cable. In the case of screened
cables, the sheath shall not adhere to the screen except when it is intentionally bonded to it.
2.2.9 Colour of sheath
The colour of the sheath may be specified in the relevant detail cable specification.

– 10 – 62012-1  IEC:2002(E)
2.3 Identification
2.3.1 Cable marking
Unless otherwise specified, each length of cable shall bear the name of the manufacturer and,
when required, the year of manufacture, using one of the following methods:
a) coloured threads or tapes;
b) printed tape;
c) printing on the core wrappings;
d) marking on the sheath.
Additional markings may be required on the sheath as indicated in the relevant detail cable
specification.
2.3.2 Labelling
Information shall be given either on a label attached to each length of finished cable or on the
outside of the product packaging, as follows:
a) type of cable;
b) manufacturer's name or logo;
c) year of manufacture;
d) length of cable in metres.
2.4 Finished cable
The finished cable shall be adequately protected for storage and shipment.
3 Test methods
3.1 General remarks
Unless otherwise specified, all tests shall be carried out under the conditions specified in
IEC 60068.
3.2 Electrical tests
Electrical tests are performed according to IEC 61156-1. The relevant sectional specification
gives the applicable tests.
3.3 Mechanical and dimensional measurement tests
3.3.1 Measurement of dimensions
The measurement of thickness and diameter shall be carried out in accordance with Clause 8
of IEC 60811-1-1.
3.3.2 Elongation at break of the conductor
The method of measuring the elongation at break of the conductor is specified in 3.3 of
IEC 60189-1.
3.3.3 Tensile strength of the insulation
When applicable, the measurement of the tensile strength of the insulation is performed in
accordance with 9.1.7 of IEC 60811-1-1.

62012-1  IEC:2002(E) – 11 –
3.3.4 Elongation at break of the sheath
The method of measuring the elongation at break of the plastic sheath is specified in 9.2.7 of
IEC 60811-1-1.
3.3.5 Tensile strength of the sheath
The method of measuring the tensile strength of the plastic sheath is specified in 9.2.7 of
IEC 60811-1-1.
3.3.6 Crush test of the cable
3.3.6.1 Object
To determine the ability of a cable to withstand a transverse load (or a force) applied to any
part of the cable.
3.3.6.2 Procedure
The test is performed at 1 m from the near end of a 100 m length of cable.
The load (F) as indicated in the relevant cable specification shall be applied gradually without
any abrupt change for a duration of 2 min. If incremental loading is used the steps shall not
exceed a ratio of 1,5.
2 F
100 mm
Cable under test
Radius of 5 mm
100 mm
IEC  1354/02
Figure 1 – Fixture for cable crushing test
3.3.6.3 Requirements
During the test, the transmission characteristics shall be within the limiting values specified in
the detail specification.
The detail specification may, in addition, indicate other tests to be performed.

– 12 – 62012-1  IEC:2002(E)
3.3.6.4 Information to be given in the detail specification
a) Value of the force F.
b) Distance from the test region to the test port.
c) Electrical tests and their requirements.
3.3.7 Bending under tension
3.3.7.1 Object
To determine the ability of a cable to withstand a number of reverse bends.
3.3.7.2 Procedure
The test is performed on the first 10 m from the near end of a 100 m length of cable.
The cable is subjected to a certain number of reverse bends using a pulling "go and return"
arrangement over its entire length. The radius of the two pulleys shall be in accordance with
the minimum dynamic bending radius of the cable as stated in the relevant detail
specification. The pulleys shall be positioned so that the bending angle of the cable on each
pulley is more than 90° as shown in Figure 2.
The cable is pulled forwards and backwards against a restraining force F which is set to
r
ensure continuous contact between the cable and the pulleys.
The speed should not be less than 1 m/min.
O
F
r
120°
P1
P2
F
120°
IEC  1355/02
Figure 2 – Bending under tension
3.3.7.3 Requirements
After the test, the cable shall show no visual damage and the electrical requirements shall be
satisfied.
62012-1  IEC:2002(E) – 13 –
3.3.7.4 Information to be given in the detail specification
a) Number of cycles.
b) Electrical tests and their required limits to be applied.
3.3.8 Tensile performance of the cable
This subclause specifies the method of test to determine the ability of a finished to withstand
a tensile load.
3.3.8.1 Equipment
The equipment shall consist of a tensile strength measuring apparatus that is able to
accommodate the minimum length to be tested. Transfer devices may be used and a load cell
with a maximum error of ±3 % of its maximum range. Care should be taken that the specific
method of clamping the cable should not affect the results (see Figure 3).

– 14 – 62012-1  IEC:2002(E)
Clamping Clamping
device device
Cable length under test
Pulling
Load cell
equipment
Measuring
equipment
Chuck drums
Transfer device
Transfer
device
Chuck drums
Pulling
Transfer
and
equipment
device
transfer device
Cable length under test
Load cell
Cable
on reel
Measuring
equipment
IEC  1356/02
Figure 3 – Tensile performance measuring apparatus
3.3.8.2 Test temperature
Unless otherwise specified, the test shall be carried out at ambient temperature.
3.3.8.3 Sampling
The sample shall be of a length sufficient to carry out the test specified.
3.3.8.4 Procedure
a) Load the cable onto the tensile rig and secure it. At both ends of the tensile rig, a method
of securing the cable shall be used which uniformly locks the cable so that all components

62012-1  IEC:2002(E) – 15 –
of the cable are restricted in their movement. For most cable constructions, clamping on
cable is practical.
b) Connect the cable under tensile test to the measurement apparatus.
c) The tension shall be continuously increased to the required value given in the detail
specification.
3.3.8.5 Requirements
After test, the attenuation characteristics shall be within the limiting values specified in the
detail specification.
3.3.8.6 Details to be specified
– Length of the cable and length under tension.
– Tensile load.
– End preparation.
– Rate of tension increase.
– Minimum accuracy for the measurement of the cable length, if applicable.
– Temperature.
3.4 Environmental tests
3.4.1 Shrinkage of the insulation
The method of measuring the shrinkage of the insulation is specified in Clause 10 of
IEC 60811-1-3.
3.4.2 Vibration
3.4.2.1 Procedure
This test shall be carried out in accordance with test Fc of IEC 60068-2-6 as specified in 9.3.3
of IEC 61169-1 which includes details on continuity monitoring and on the information which
should be given in the relevant sectional and detail specifications.
3.4.2.2 Severities
The vibration severity shall be defined by a combination of three parameters: range of
frequency, vibration amplitude and duration in terms of the number of cycles. The relevant
specification shall select the appropriate requirement for each parameter from the following
recommended values:
– 16 – 62012-1  IEC:2002(E)
Swept frequency range: 10 Hz-150 Hz
10 Hz-500 Hz
10 Hz-2 000 Hz
Vibration amplitude:
Vibration amplitude shall be specified below 57 Hz to 62 Hz and at higher frequencies
acceleration amplitude shall be specified. (See table 1.)
Table 1 – Requirement for vibration
Displacement amplitude Acceleration Amplitude
mm m/s g
0,75 98 10
1,0 147 15
1,5 196 20
Duration:
Number of swept cycles in each axis: 2, 5, 10 or 20.
3.4.2.3 Requirements
At the conclusion of the recovery period the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
The insulation resistance measurement and the voltage proof shall be carried out within
30 min of expiry of the recovery period.
3.4.2.4 Information to be given in the detail specification
a) Severity of the test.
b) Electrical checks made immediately after conditioning and after the recovery period and
their requirements.
3.4.3 Bump
3.4.3.1 Procedure
This test shall be carried out in accordance with test Eb of IEC 60068-2-29.
3.4.3.2 Severities
Unless otherwise required in the sectional or relevant detail specification the following
recommended severity shall be selected:
Number of bumps: 1 000 ± 10.
62012-1  IEC:2002(E) – 17 –
3.4.3.3 Requirements
At the conclusion of the recovery period the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
The insulation resistance measurement and the voltage proof shall be carried out within
30 min of expiry of the recovery period.
3.4.3.4 Information to be given in the detail specification
a) Severity of the test.
b) Electrical checks made immediately after conditioning and after the recovery period and
their requirements.
3.4.4 Shock
3.4.4.1 Procedure
This test shall be carried out in accordance with test Ea of IEC 60068-2-27.
3.4.4.2 Severities
Unless otherwise required in the sectional or relevant detail specification one of the
recommended pulse shapes given in Table 2 shall be selected. The shock severity is given by
a combination of the peak acceleration and the duration of the nominal pulse.
Table 2 – Shock severities
Corresponding duration of pulse
Corresponding Peak
Final peak
velocity change acceleration
Half sine Trapezoidal
sawtooth
m/s m/s g m/s m/s m/s
147 15 11 0,81 1,03 1,46
294 30 18 2,65 3,37 4,77
490 50 11 2,69 3,43 4,86
981 100 6 2,94 3,74 5,30
4 900 500 1 2,45 3,12 4,42
14 700 1 500 0,5 3,68 4,68 6,62
3.4.4.3 Requirements
At the conclusion of the recovery period the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
– 18 – 62012-1  IEC:2002(E)
The insulation resistance measurement and the voltage proof shall be carried out within
30 min of expiry of the recovery period.
3.4.4.4 Information to be given in the detail specification
a) Severity of the test.
b) Electrical checks made immediately after conditioning and after the recovery period and
their requirements.
3.4.5 Reaction to fire
3.4.5.1 Flame propagation characteristics of a single cable
The method of measuring the burning performance of a single cable is specified in IEC 60332-1.
When this method is not suitable because a small conductor may melt under the application of
the flame, the cable shall be tested in accordance with IEC 60332-2.
3.4.5.2 Flame propagation characteristics of bunched cables
The method of measuring the burning performance of bunched cables is specified in
IEC 60332-3 series.
3.4.5.3 Horizontal integrated fire test method
The horizontal integrated fire test method is specified in Annex A.
3.4.6 Fire resistance characteristic of a single cable
3.4.6.1 Object
This clause specifies requirements relating to the maintenance of circuit integrity under fire
conditions and describes the methods taken to achieve this aim. The maintenance of circuit
integrity as assessed on the basis of this standard takes into account the performance
requirements of the related application or cabling.
3.4.6.2 Maintenance of transmission performance
The circuit integrity is deemed to be maintained if the changes of the transmission
characteristics given in Table 3 remain within the allowed margin for the intended use
according to the length subjected to the fire test procedure specified in 3.4.6.4.
Table 3 – Characteristics to be checked versus the frequency range
of the application
Operating frequency range of the
Characteristic to be checked
intended application
Up to 100 kHz Mutual capacitance/Insulation resistance
Up to 2 MHz Attenuation
Up to 16 MHz Attenuation/Xtalk
Up to 100 MHz Attenuation/Xtalk/RL
3.4.6.3 Maintenance of transmission performance classes
According to the length of time during which circuit integrity is maintained, the cable system is
to be assigned to one of the classes listed in Table 4.

62012-1  IEC:2002(E) – 19 –
Table 4 – Circuit integrity classes E
Minimum time of maintained circuit
Circuit integrity classes integrity
min
E 30 30 or more
E 60 60 or more
E 90 90 or more
3.4.6.4 Procedure
At 10 m from its free end, 10 m of the cable are laid down on a metallic tray jig to
accommodate the minimum bending radius of the cable under test with the size of the
furnace. The details of the tray have to be given in the detail specification.
The jig is placed into the IEC 60332-3 series furnace when it is possible. For large cables, the
test equipment defined by IEC 61034-1 shall be used.
Fire conditions are defined in IEC 60332-3 series.
The ends of the cable shall be equipped with suitable connectors to perform the required tests
in good conditions.
3.4.6.5 Requirements
During the test, the electrical requirements shall be satisfied.
3.4.6.6 Information to be given in the relevant specification
a) Total length of the cable subjected to the fire.
b) Electrical tests and their required limits to be applied.
3.4.7 Halogen gas evolution
The method of measuring the evolution of halogen gas is specified in IEC 60754-1.
3.4.8 Smoke generation
The method of measuring the amount of smoke generated is specified in IEC 61034-2.
3.4.9 Toxic gas emission
Under consideration.
3.5 Temperature tests
3.5.1 Climatic sequence
3.5.1.1 Procedure
The test shall be performed in accordance with 9.4.2 of IEC 61169-1. The cable shall be
wound on a mandrel of minimum static bending radius. The number of full turns shall be
three, unless otherwise specified in the detail specification.

– 20 – 62012-1  IEC:2002(E)
3.5.1.2 Severities
Unless otherwise required in the sectional or relevant detail specification one of the following
recommended severities shall be selected:
Low temperature: –40 °C; – 55 °C
High temperature: +70 °C; +85 °C; +125 °C; +155 °C; +200 °C
Duration: 4, 10, 21 or 56 days
3.5.1.3 Requirements
At the conclusion of the recovery period, the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
The insulation resistance measurement and the voltage proof shall be carried out within
30 min of expiry of the recovery period.
3.5.1.4 Information to be given in the detail specification
a) Severity of each step of the climatic sequence.
b) Number of turns on the mandrel if other than three.
c) Electrical tests made during and after the sequence and their requirements.
3.5.2 Damp heat, steady state
3.5.2.1 Procedure
This test shall be carried out in accordance with test Ca of IEC 60068-2-3. The cable is wound
on a mandrel of minimum static bending radius. The number of full turns shall be three, unless
otherwise specified in the detail specification.
3.5.2.2 Severities
Unless otherwise required in the sectional or relevant detail specification, one of the following
recommended severities shall be selected:
Duration: 4, 10, 21 or 56 days.
3.5.2.3 Requirements
At the conclusion of the recovery period the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
The insulation resistance measurement and the voltage proof shall be carried out within
30 min of expiry of the recovery period.

62012-1  IEC:2002(E) – 21 –
3.5.2.4 Information to be given in the detail specification
a) Severity of the test.
b) Number of turns on the mandrel if other than three.
c) Electrical checks made immediately after conditioning and after recovery period and their
requirements.
d) Mandrel diameter
3.5.3 Rapid change of temperature
3.5.3.1 Procedure
This test shall be carried out in accordance with test Nc of IEC 60068-2-14. The range of
temperature shall be selected in accordance with the test of climatic sequence The cable shall
be wound on a mandrel of minimum static bending radius. The number of full turns shall be
three, unless otherwise specified in the detail specification.
3.5.3.2 Severities
Velocity of change: 1 °C ± 0,2 °C/min.
Number of cycles: 2, unless otherwise specified.
3.5.3.3 Requirements
At the conclusion of the recovery period, the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Voltage proof.
c) Insertion loss.
d) Visual inspection.
3.5.3.4 Information to be given in the detail specification
a) Minimum and maximum temperature.
b) Number of turns on the mandrel if other than three.
c) Final tests and measurements and their requirements.
d) Mandrel diameter.
3.5.4 Temperature resistance characteristic of a single cable
3.5.4.1 Object
To determine the temperature resistance of a cable.
3.5.4.2 Procedure
The cable is subjected to a temperature of 380° in accordance with Figure 4, unless otherwise
specified in the relevant specification.

– 22 – 62012-1  IEC:2002(E)
352,5
Temperature
0 5 10 15
min
IEC  1357/02
Figure 4 – Example of temperature versus time
3.5.4.3 Requirements
During the test, the electrical requirements shall be satisfied.
3.5.4.4 Information to be given in the relevant specification
a) Length of the cable subjected to the heat.
b) Electrical tests and their required limits to be applied.
c) Temperature increase if different from the above curve.
3.6 Chemical tests
3.6.1 Solvents and contaminating fluids
3.6.1.1 Procedure
The test shall be performed in accordance with 9.7 of IEC 61169-1.
3.6.1.2 Requirements
At the conclusion of the recovery period, the cable shall comply with the requirements of the
following tests, unless otherwise specified in the detail specification.
a) Insulation resistance.
b) Visual inspection.
c) Insertion loss.
d) Tensile strength and elongation of the sheath.
3.6.1.3 Information to be given in the detail specification
a) Conditioning fluids.
b) Drying temperature, if different from 70 °C.
c) Requirements for insulation resistance and insertion loss.
3.6.2 Salt mist and sulphur dioxide tests
3.6.2.1 Procedure
The tests shall be selected from IEC 60068-2 series. Severities are to be given in the detail
specification.
62012-1  IEC:2002(E) – 23 –
3.6.2.2 Severities
The salt mist test shall be carried out in accordance with test Ka of IEC 60068-2-11.
...

IEC 62012-1
Edition 1.0 2002-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multicore and symmetrical pair/quad cables for digital communications to be
used in harsh environments –
Part 1: Generic specification
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques utilisés en environnements sévères –
Partie 1: Spécification générique
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IEC 62012-1
Edition 1.0 2002-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multicore and symmetrical pair/quad cables for digital communications to be
used in harsh environments –
Part 1: Generic specification
Câbles multiconducteurs à paires symétriques et quartes pour transmissions
numériques utilisés en environnements sévères –
Partie 1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 33.120.20 ISBN 2-8318-7422-X
– 2 – 62012-1 © CEI:2002
SOMMAIRE
AVANT-PROPOS .6
INTRODUCTION.10
1 Généralités.12
1.1 Domaine d’application.12
1.2 Références normatives.12
1.3 Définitions .14
1.4 Considérations d’environnement .14
2 Matériaux et construction du câble .16
2.1 Remarques générales.16
2.2 Construction du câble .16
2.3 Identification.20
2.4 Câble terminé .20
3 Méthodes d’essai.20
3.1 Remarques générales.20
3.2 Essais électriques.20
3.3 Essais mécaniques et dimensionnels .22
3.4 Essais d’environnement.30
3.5 Essais en température.38
3.6 Essais chimiques.44
3.7 Tenue aux radiations .46

Annexe A (normative )  Méthode intégrée d'essai horizontal au feu.54
A.1 Définitions, symboles et abréviations.54
A.2 Environnement d'essai .54
A.3 Appareillage d'essai .54
A.4 Eprouvettes d’essai.72
A.5 Etalonnage et entretien de l'équipement d'essai .74
A.6 Préparation de l’échantillon en essai .84
A.7 Procédures d’essai .86
A.8 Nettoyage et examen après essai.88
A.9 Calculs .90
A.10 Rapport.96

Annexe B (normative) Méthode pour déterminer la pertinence des analyseurs
d'oxygène pour réaliser des mesures de dégagement de chaleur.98
B.1 Généralités .98
B.2 Procédure .98
B.3 Précautions supplémentaires .98

Annexe C (informative) Liste d’information sur les matériaux . 100
C.1 Analyseur. 100
C.2 Chambre d'essai au feu . 100
C.3 Briques réfractaires. 100

62012-1 © IEC:2002 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11
1 General.13
1.1 Scope.13
1.2 Normative references.13
1.3 Definitions.15
1.4 Environmental considerations.15
2 Materials and cable construction .17
2.1 General remarks.17
2.2 Cable construction.17
2.3 Identification.21
2.4 Finished cable.21
3 Test methods.21
3.1 General remarks.21
3.2 Electrical tests.21
3.3 Mechanical and dimensional measurement tests .23
3.4 Environmental tests.31
3.5 Temperature tests.39
3.6 Chemical tests.45
3.7 Radiation tests.47

Annex A (normative) Horizontal integrated fire-test method .55
A.1 Definitions, symbols and abbreviations .55
A.2 Test environment .55
A.3 Test apparatus.55
A.4 Test specimens .73
A.5 Calibration and maintenance of test equipment.75
A.6 Test specimen preparation.85
A.7 Test procedures.87
A.8 Post-test clean-up and inspection .89
A.9 Calculations.91
A.10 Report.97

Annex B (normative) Method for determining suitability of oxygen analysers for making
heat release measurements .99
B.1 General.99
B.2 Procedure.99
B.3 Additional precautions.99

Annex C (informative) Material information list .101
C.1 Analyser.101
C.2 Fire-test chamber.101
C.3 Firebrick.101

– 4 – 62012-1 © CEI:2002
C.4 Panneaux de verre intérieurs. 100
C.5 Lampe. 102
C.6 Dispositif d’enregistrement . 102
C.7 Sonde bidirectionnelle. 102
C.8 Filtres à densité neutre. 102
C.9 Calorimètre à gaz. 102
C.10 Conducteur isolé standard (câble d’étalonnage) . 102

Annexe D (informative) Taille des briques . 104

Bibliographie . 106

Figure 1 – Appareillage pour essai d’écrasement sur câble.24
Figure 2 – Courbure sous tension.26
Figure 3 – Appareillage de mesure du comportement du câble à la traction .28
Figure 4 – Exemple de courbe de température en fonction de la durée .44
Figure 5 – Equipement d’essai pour rayonnement.50
Figure A.1 – Schéma de la chambre d'admission d'air (les tolérances figurent dans les
paragraphes concernés).56
Figure A.2 – Schéma de la chambre d'essai au feu (Les tolérances figurent dans les
paragraphes concernés).60
Figure A.3 – Section transversale de la chambre d'essai au feu (coupe B-B, Figure A.2).60
Figure A.4 – Schéma du circuit d'extraction (les tolérances figurent dans les
paragraphes concernés).64
Figure A.5 – Système de mesure des fumées .66
Figure A.6 – Implantation du passage de l'extraction, de la gaine d'extraction, du
système de mesure de fumée et du registre (les tolérances figurent dans les
paragraphes concernés).68
Figure A.7 – Détails du chemin de câble en échelle et des supports (Les tolérances sont
données dans les paragraphes applicables) .70
Figure A.8 – Schéma du système d'échantillonnage de gaz .72
Figure A.9- Historique de la température du panneau inorganique en ciment armé
mesurée au thermocouple dans l'air ambiant (7 m).80

Tableau 1 – Prescription pour essai de vibration.32
Tableau 2 – Sévérité pour l’essai de chocs.34
Tableau 3 – Caractéristiques à vérifier en fonction de la plage de fréquence de
l’application.36
Tableau 4 – Classes E d’intégrité du circuit .38
Tableau 5 – Combinaisons dose totale / débit de dose.52
Tableau D.1 – Tailles des briques . 104

62012-1 © IEC:2002 – 5 –
C.4 Inside glass panes.101
C.5 Lamp.103
C.6 Recording device .103
C.7 Bi-directional probe.103
C.8 Neutral density filters.103
C.9 Gas calorimeter.103
C.10 Standard insulated conductor (calibration cable).103

Annex D (informative) Brick sizes .105

Bibliography.107

Figure 1 – Fixture for cable crushing test .25
Figure 2 – Bending under tension .27
Figure 3 – Tensile performance measuring apparatus .29
Figure 4 – Example of temperature versus time .45
Figure 5 – Test set up for radiation .51
Figure A.1 – Schematic of the air-inlet chamber.57
Figure A.2 – Schematic of the fire test chamber.61
Figure A.3 – Cross-section of the fire test chamber (Section B-B, Figure A.2) .61
Figure A.4 – Schematic of the exhaust transition .65
Figure A.5 – Smoke measurement system .67
Figure A.6 – Location of exhaust transition, exhaust duct, smoke measurement system
and damper .69
Figure A.7 – Details of ladder cable tray and supports .71
Figure A.8 – Schematic of gas sampling system .73
Figure A.9 – Temperature history of inorganic reinforced cement board at
thermocouple in air (7 m) .81

Table 1 – Requirement for vibration .33
Table 2 – Sock severities.35
Table 3 – Characteristics to be checked versus the frequency range of the application.37
Table 4 – Circuit integrity classes E .39
Table 5 – Total dose/dose rate combinations .53
Table D.1 – Sizes of bricks .105

– 6 – 62012-1 © CEI:2002
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
___________
CÂBLES MULTICONDUCTEURS À PAIRES SYMÉTRIQUES
ET QUARTES POUR TRANSMISSIONS NUMÉRIQUES
UTILISÉS EN ENVIRONNEMENTS SÉVÈRES –

Partie 1: Spécification générique

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
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2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
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référencées est obligatoire pour une application correcte de la présente publication.
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responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 62012-1 a été préparée par le sous-comité 46C: Câbles
symétriques et fils, du comité d'étude 46 de la CEI: Câbles, fils, guides d’ondes, connecteurs,
composants passifs pour micro-onde et accessoires.
Cette version bilingue, publiée en 2004-02, correspond à la version anglaise.
Le texte anglais de cette norme est issu des documents 46C/503/FDIS et 46C/535/RVD.
Le rapport de vote 46C/535/RVD donne toute information sur le vote ayant abouti à
l'approbation de cette norme.
La version française de cette norme n'a pas été soumise au vote.

62012-1 © IEC:2002 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL
COMMUNICATIONS TO BE USED IN HARSH ENVIRONMENTS –

Part 1: Generic specification
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62012-1 has been prepared by subcommittee 46C: Wires and
symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors,
RF and microwave passive components and accessories.
This bilingual version, published in 2004-02, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS RVD
46C/503/FDIS 46C/535/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.

– 8 – 62012-1 © CEI:2002
La présente norme constitue la Partie 1 de la série CEI 62012, publiée sous le titre générale
Câbles multiconducteurs à paires symétriques et quartes pour transmissions numériques
utilisés en environnements sévères.
La Partie 2 est actuellement en préparation.
Cette publication a été rédigée en conformité avec les Directives ISO/CEI, Partie 2.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2007. A cette
date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
62012-1 © IEC:2002 – 9 –
This standard constitutes Part 1 of the IEC 62012 series, published under the general title
Multicore and symmetrical pair/quad cables for digital communications to be used in harsh
environments.
Part 2 is currently in preparation.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2007. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 10 – 62012-1 © CEI:2002
INTRODUCTION
Les câbles utilisés pour le câblage usuel d’abonnés ou autres câblages pour la technologie de
l’information peuvent avoir à fonctionner en environnements sévères. Cela peut se produire en
cas de feu, mais aussi dû aux conditions d’installation sur le site industriel. Cette norme sera
complétée par des normes intermédiaires répondant à une fonction particulière comme défini
en 1.4. Des spécifications particulières renverront à une ou plusieurs spécifications
intermédiaires suivant la conception donnée du câble.

62012-1 © IEC:2002 – 11 –
INTRODUCTION
The cables used for customer premises cabling or other IT cabling may have to work in harsh
environments. This can be in case of fire but also due to conditions of installation in industrial
plant. This standard will be supplemented by sectional specifications addressing a particular
function as defined in 1.4. Detail specifications will refer to one or several sectional
specifications depending upon the actual design of the cable.

– 12 – 62012-1 © CEI:2002
CÂBLES MULTICONDUCTEURS À PAIRES SYMÉTRIQUES
ET QUARTES POUR TRANSMISSIONS NUMÉRIQUES
UTILISÉS EN ENVIRONNEMENTS SÉVÈRES –

Partie 1: Spécification générique

1 Généralités
1.1 Domaine d’application
Cette partie de la CEI 62012 spécifie, dans le cas d’utilisation en environnements sévères, les
définitions et les méthodes d’essai pour les câbles multiconducteurs à paires symétriques et
quartes utilisés dans les systèmes en transmissions numériques tels que RNIS (ISDN), les
réseaux locaux et les systèmes de transmission de données. Cette norme donne des lignes
directrices pour la conception et la vérification de ces câbles.
1.2 Références normatives
Les documents en référence qui suivent sont indispensables pour la mise en application de ce
document. Pour les références datées, seule l’édition citée s’applique. Pour les références non
datées, la dernière édition du document en référence (y compris les éventuels amendements)
s’applique.
CEI 60028:1925, Spécification internationale d'un cuivre-type recuit
CEI 60050(701), Vocabulaire électrotechnique international (VEI) – Chapitre 701: Télécom-
munications, voies et réseaux
CEI 60050(704), Vocabulaire électrotechnique international (VEI )– Chapitre 704: Transmission
CEI 60050(722), Vocabulaire électrotechnique international (VEI) – Chapitre 722: Téléphonie
CEI 60068-2 (toutes les parties), Essais d’environnement – Essais
CEI 60189-1:1986, Câbles et fils pour basses fréquences isolés au PVC et sous gaine de
PVC – Partie 1: Méthodes générales d'essai et de vérification
CEI 60304:1982, Couleurs de référence de l'enveloppe isolante pour câbles et fils pour
basses fréquences
CEI 60332-1:1993, Essais des câbles électriques soumis au feu – Partie 1: Essai sur un
conducteur ou câble isolé vertical
CEI 60332-2:1989, Essais des câbles électriques soumis au feu – Partie 2: Essai sur un petit
conducteur ou câble isolé à âme en cuivre, en position verticale
CEI 60332-3 (toutes parties), Essais des câbles électriques soumis au feu – Partie 3: Essais
sur des fils ou câbles en nappes
CEI 60754-1, Essai des gaz émis lors de la combustion des câbles – Partie 1: Détermination
de la quantité de gaz acide halogéné

62012-1 © IEC:2002 – 13 –
MULTICORE AND SYMMETRICAL PAIR/QUAD CABLES FOR DIGITAL
COMMUNICATIONS TO BE USED IN HARSH ENVIRONMENTS –

Part 1: Generic specification
1 General
1.1 Scope
This part of IEC 62012 specifies the definitions and test methods, when used in harsh
environment, of symmetrical pair and quad cables used in digital communication systems
such as ISDN, local area networks and data communication systems. This standard gives
guidance concerning the design and testing of these cables.
1.2 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.
IEC 60028:1925, International standard of resistance for copper
IEC 60050(701), International Electrotechnical Vocabulary (IEV) – Chapter 701: Telecommu-
nications, channels and networks
IEC 60050(704), International Electrotechnical Vocabulary (IEV) – Chapter 704: Transmission
IEC 60050(722), International Electrotechnical Vocabulary (IEV) – Chapter 722: Telephony
IEC 60068-2 (all parts), Environmental testing – Part 2: Tests
IEC 60189-1:1986, Low-frequency cables and wires with PVC insulation and PVC sheath –
Part 1: General test and measuring methods
IEC 60304:1982, Standard colours for insulation for low-frequency cables and wires
IEC 60332-1:1993, Tests on electric cables under fire conditions – Part 1: Test on a single
vertical insulated wire or cable
IEC 60332-2:1989, Tests on electric cables under fire conditions – Part 2: Test on a single
small vertical insulated copper wire or cable
IEC 60332-3 (all parts), Tests on electric cables under fire conditions – Part 3: Tests on
bunched wires or cables
IEC 60754-1, Test on gases evolved during combustion of materials from cables – Part 1:
Determination of the amount of halogen acid gas

– 14 – 62012-1 © CEI:2002
CEI 60811-1-1:1993, Méthodes d'essais communes pour les matériaux d'isolation et de
gainage des câbles électriques – Partie 1: Méthodes d'application générale – Section 1:
Mesure des épaisseurs et des dimensions extérieures – Détermination des propriétés
mécaniques
CEI 60811-1-3:1985, Méthodes d'essais communes pour les matériaux d'isolation et de
gainage des câbles électriques – Partie 1: Méthodes d'application générale – Section 3:
Méthodes de détermination de la masse volumique – Essais d'absorption d'eau – Essai de
rétraction
CEI 60811-1-4:1985, Méthodes d'essais communes pour les matériaux d'isolation et de
gainage des câbles électriques – Partie 1: Méthodes d'application générale – Section 4:
Essais à basse température
CEI 61034-1, Mesure de la densité de fumées dégagées par des câbles électriques brûlant
dans des conditions définies – Partie 1: Appareillage d’essai
CEI 61034-2, Mesure de la densité de fumées dégagées par des câbles électriques brûlant
dans des conditions définies – Partie 2: Procédure d’essai et prescriptions
1.3 Définitions
Pour les besoins de ce document, les définitions données dans la CEI 60050-701, la CEI
60050-704, la CEI 60050-722 et la CEI 61156-1 sont applicables.
1.4 Considérations d’environnement
Les câbles doivent être conçus pour fonctionner dans une ou plusieurs des conditions
d’environnement suivantes.
Le but de cette norme est que tout câble défini comme conforme à l’une ou à plusieurs des
définitions indiquées en 1.3 soit aussi conforme aux exigences électriques, mécaniques et
d’environnement données ci-dessous, lorsqu’il est essayé suivant les Articles 3 et 4.
1.4.1 Résistance au feu
Lorsqu’ils sont soumis au feu conformément à l’essai décrit en 3.4.6, les câbles doivent être
capables de transmettre le signal attendu avec ou sans dégradation comme décrit dans la
spécification particulière.
1.4.2 Température
Lorsqu’ils sont soumis aux températures de l’essai décrit en 3.5, les câbles doivent être
capables de transmettre le signal attendu avec ou sans dégradation comme décrit dans la
spécification particulière.
1.4.3 Radiations (α, β, γ)
Lorsqu’ils sont soumis aux radiations conformément à l’essai décrit en 3.7, les câbles doivent
être capables de transmettre le signal attendu avec ou sans dégradation comme décrit dans la
spécification particulière.
1.4.4 Agents chimiques
Lorsqu’ils sont soumis aux agents chimiques conformément à l’essai décrit en 3.6, les câbles
doivent être capables de transmettre le signal attendu avec ou sans dégradation comme décrit
dans la spécification particulière.

62012-1 © IEC:2002 – 15 –
IEC 60811-1-1:1993, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section 1: Measurement of thickness and
overall dimensions – Tests for determining the mechanical properties
IEC 60811-1-3:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Three: Methods for determining the
density – Water absorption tests – Shrinkage test
IEC 60811-1-4:1985, Common test methods for insulating and sheathing materials of electric
cables – Part 1: Methods for general application – Section Four: Tests at low temperature
IEC 61034-1, Measurement of smoke density of cables burning under defined conditions –
Part 1: Test apparatus
IEC 61034-2, Measurement of smoke density of cables burning under defined conditions –
Part 2: Test procedure and requirements
1.3 Definitions
For the purposes of this document, the definitions given in IEC 60050-701, IEC 60050-704,
IEC 60050-722 and IEC 61156-1 apply.
1.4 Environmental considerations
The cables shall be designed to perform in one or more of the following environmental
condition.
It is the intention of this standard that any cables defined as compliant with one or more of the
categories referred to in definitions of 1.3 shall also be compliant with the electrical,
mechanical and environmental requirement given below when tested in accordance with
Clauses 3 and 4.
1.4.1 Fire resistance
When subjected to fire according to the test described in 3.4.6, the cables shall be capable of
transmitting the expected signal with or without degradation as described in the detail
specification.
1.4.2 Temperature
When subjected to temperature according to the test described in 3.5, the cables shall be
capable of transmitting the expected signal with or without degradation as described in the
detail specification.
1.4.3 Nuclear radiations (α, β, γ)
When subjected to radiations according to the test described in 3.7, the cables shall be
capable of transmitting the expected signal with or without degradation as described in the
detail specification.
1.4.4 Chemical
When subjected to chemical agents accordingly to the test described in 3.6, the cables shall
be capable of transmitting the expected signal with or without degradation as described in the
detail specification.
– 16 – 62012-1 © CEI:2002
2 Matériaux et construction du câble
2.1 Remarques générales
Le choix des matériaux et la construction des câbles doivent être appropriés à l'utilisation et à
l'installation du câble envisagées.
2.2 Construction du câble
La construction des câbles doit être conforme aux détails et dimensions donnés dans la
spécification particulière appropriée.
2.2.1 Conducteur
Le conducteur peut être massif ou câblé. Le conducteur massif doit être de section circulaire et
peut être nu ou revêtu. Normalement le conducte
...