IEC 60794-4-10:2014
(Main)Optical fibre cables - Part 4-10: Family specification - Optical ground wires (OPGW) along electrical power lines
Optical fibre cables - Part 4-10: Family specification - Optical ground wires (OPGW) along electrical power lines
IEC 60794-4-10:2014 which is a family specification, covers cable construction, test methods and optical, mechanical, environmental and electrical performance requirements for OPGW (optical ground wire) which is used for the protection of electrical power lines against atmospheric discharges or short-circuits and, at the same time, as a high bandwidth transport media for communications-and-control optical signals. The corresponding environmental declaration may be built according to IEC TR 62839-1. This second edition cancels and replaces the first edition published in 2006 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- galloping test (9.7) has been added to the type tests list;
- update of definitions clause;
- maximum installation tension (MIT) defined and used in the sheave test description;
- definition of characterization of OPGW's mechanical behaviour in order to provide information useful for electrical power transmission lines designers;
- improved definition of lightning test parameters and conditions to improve reproducibility among different laboratories. Keywords: OPGW (optical ground wire), protection of electrical power lines, atmospheric discharges
Câbles à fibres optiques - Partie 4-10: Spécification de famille - Câbles de garde à fibres optiques le long des lignes électriques de puissance
IEC 60794-4-10: 2014 qui est une spécification de famille, couvre la construction des câbles, les méthodes d'essai et les exigences de performances optiques, mécaniques, d'environnement et électriques pour des câbles de garde à fibres optiques (OPGW), utilisés pour la protection des lignes électriques de puissance contre les décharges atmosphériques ou les courts-circuits, mais aussi comme support de transport à très large bande pour les signaux optiques de communication et de contrôle. La déclaration environnementale correspondante peut être établie conformément à l'IEC TR 62839-1. Un câble de garde à fibres optiques peut remplacer un câble de protection et de mise à la terre traditionnel contenant des fibres optiques destinées au contrôle et/ou aux communications. Habituellement, les fibres sont intégrées de manière lâche dans des tubes de protection. Pour satisfaire aux exigences mécaniques et électriques, une armure constituée d'une ou plusieurs couches avec de l'aluminium, un alliage d'aluminium, de l'acier plaqué aluminium, de l'acier galvanisé ou un mélange de ceux-ci est toronnée de manière hélicoïdale. Si la construction contient un tube d'aluminium ou un jonc rainuré en aluminium, cette section est considérée comme une partie conductrice. Cette deuxième édition annule et remplace la première édition parue en 2006 dont elle constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) l'essai de galop (9.7) a été ajouté à la liste des essais de type;
b) l'article sur les définitions a été mis à jour; la tension d'installation maximale (MIT) définie et utilisée dans la description de l'essai de passage sur poulies;
c) définition de la caractérisation du comportement mécanique des câbles de garde à fibres optiques pour fournir des informations utiles aux concepteurs de lignes de transmission de puissance électrique;
d) amélioration de la définition des paramètres et des conditions des essais de choc de foudre pour améliorer la reproductibilité entre différents laboratoires.
Mots clés : câbles de garde à fibres optiques (OPGW), protection des lignes électriques de puissance, décharges atmosphériques
Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines - Section 4: Immunity to HEMP - Specifications of protective devices against HEMP radiated disturbance - Basic EMC publication
General Information
Relations
Standards Content (Sample)
IEC 60794-4-10 ®
Edition 2.0 2014-10
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 4-10: Family specification – Optical ground wires (OPGW) along electrical
power lines
All rights reserved. Unless otherwise specified, 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
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International Standards for all electrical, electronic and related technologies.
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IEC 60794-4-10 ®
Edition 2.0 2014-10
INTERNATIONAL
STANDARD
colour
inside
Optical fibre cables –
Part 4-10: Family specification – Optical ground wires (OPGW) along electrical
power lines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
R
ICS 33.180.10 ISBN 978-2-8322-1909-6
– 2 – IEC 60794-4-10:2014 © IEC 2014
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Cables . 7
3.2 Other definitions . 7
4 Optical fibre . 8
4.1 General . 8
4.2 Attenuation . 9
4.2.1 Attenuation coefficient . 9
4.2.2 Attenuation uniformity and attenuation discontinuities . 9
4.3 Cut-off wavelength of cabled fibre . 9
4.4 Fibre colouring . 9
4.5 Polarization mode dispersion (PMD) . 9
5 Cable element . 9
6 Cable construction . 10
7 Cable design characteristics . 10
8 Cable tests . 11
8.1 General . 11
8.2 Classification of tests . 11
8.2.1 Type tests . 11
8.2.2 Factory acceptance tests . 12
8.2.3 Routine tests . 12
8.3 Type tests . 12
8.3.1 General . 12
8.3.2 Tensile performance . 12
8.3.3 Stress-strain test . 13
8.3.4 Breaking strength test . 13
8.3.5 Sheave test . 13
8.3.6 Aeolian vibration test . 14
8.3.7 Creep . 14
8.3.8 Low frequency vibration test (Galloping test) . 15
8.3.9 Temperature cycling . 15
8.3.10 Water penetration (applicable to optical unit(s) only). 16
8.3.11 Short-circuit . 16
8.3.12 Lightning test . 16
Factory acceptance tests . 17
8.4
8.4.1 General . 17
8.4.2 Typical tests . 17
8.5 Routine tests. 17
8.5.1 General . 17
8.5.2 Typical tests . 18
Quality assurance . 18
Annex A (informative) Packaging and marking . 19
Bibliography . 20
Table 1 – Cable design characteristics . 10
Table 2 – Lightning test conditions and parameters to be informed in the test report . 17
– 4 – IEC 60794-4-10:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 4-10: Family specification –
Optical ground wires (OPGW) along electrical power lines
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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 60794-4-10 has been prepared by subcommittee 86A: Fibres and
Cables, of IEC technical committee 86. Fibre optics
This second edition cancels and replaces the first edition published in 2006 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) galloping test (9.7) has been added to the type tests list;
b) update of definitions clause; maximum installation tension (MIT) defined and used in the
sheave test description;
c) definition of characterization of OPGW’s mechanical behaviour in order to provide
information useful for electrical power transmission lines designers;
d) improved definition of lightning test parameters and conditions to improve reproducibility
among different laboratories.
The text of this standard is based on the following documents:
CDV Report on voting
86A/1594/CDV 86A/1627/RVC
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.
A list of all parts in the IEC 60794 series, published under the general title Optical fibre
cables, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued
...
IEC 60794-4-10 ®
Edition 2.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 4-10: Family specification – Optical ground wires (OPGW) along electrical
power lines
Câbles à fibres optiques –
Partie 4-10: Spécification de famille – Câbles de garde à fibres optiques le long
des lignes électriques de puissance
All rights reserved. Unless otherwise specified, 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
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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IEC 60794-4-10 ®
Edition 2.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibre cables –
Part 4-10: Family specification – Optical ground wires (OPGW) along electrical
power lines
Câbles à fibres optiques –
Partie 4-10: Spécification de famille – Câbles de garde à fibres optiques le long
des lignes électriques de puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-6970-1
– 2 – IEC 60794-4-10:2014 © IEC 2014
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Cables . 7
3.2 Other definitions . 7
4 Optical fibre . 8
4.1 General . 8
4.2 Attenuation . 9
Attenuation coefficient . 9
Attenuation uniformity and attenuation discontinuities . 9
4.3 Cut-off wavelength of cabled fibre . 9
4.4 Fibre colouring . 9
4.5 Polarization mode dispersion (PMD) . 9
5 Cable element . 9
6 Cable construction . 10
7 Cable design characteristics . 10
8 Cable tests . 11
8.1 General . 11
8.2 Classification of tests . 11
Type tests . 11
Factory acceptance tests . 11
Routine tests . 12
8.3 Type tests . 12
General . 12
Tensile performance . 12
Stress-strain test . 13
Breaking strength test . 13
Sheave test . 13
Aeolian vibration test . 14
Creep . 14
Low frequency vibration test (Galloping test) . 14
Temperature cycling . 15
Water penetration (applicable to optical unit(s) only). 15
Short-circuit . 16
Lightning test . 16
8.4 Factory acceptance tests . 17
General . 17
Typical tests . 17
8.5 Routine tests. 17
General . 17
Typical tests . 18
9 Quality assurance . 18
Annex A (informative) Packaging and marking . 19
Bibliography . 20
Table 1 – Cable design characteristics . 10
Table 2 – Lightning test conditions and parameters to be informed in the test report . 17
– 4 – IEC 60794-4-10:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRE CABLES –
Part 4-10: Family specification –
Optical ground wires (OPGW) along electrical power lines
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 this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
members of its technical committees and IEC Natio
...
SLOVENSKI SIST-TP IEC/TR2 61000-5-
4:2004
STANDARD
april 2004
Electromagnetic compatibility (EMC) - Part 5: Installation and mitigation guidelines -
Section 4: Immunity to HEMP - Specifications of protective devices against HEMP
radiated disturbance - Basic EMC publication
ICS 33.100.01 Referenčna številka
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
RAPPORT
CEI
TECHNIQUE - TYPE 2
I EC
1000-5-4
TECHNICAL
Première édition
First edition
REPORT-TYPE 2
1996-08
Compatibilité électromagnétique (CEM) -
Partie 5:
Guide d'installation et d'atténuation -
Section 4: Immunité à I'IEM-HA -
Spécifications des dispositifs de protection
contre les perturbations rayonnées IEM-HA -
Publication fondamentale en CEM
Electromagnetic compatibility (EMC)
-
Part 5:
Installation and mitigation guidelines
-
Section
4: Immunity to HEMP -
Specifications for protective devices against
HEMP radiated disturbance -
Basic EMC publication
© CEI 1996 Droits de reproduction réservés
— Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized
utilisée sous quelque forme que ce soit et par aucun procédé, in any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission
microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher
Bureau central de la Commission Electrotechnique Inte rn
ationale 3, rue de Varembé Genève Suisse
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission PRICE CODE
IEC
MehtgyHapo was 3neKTpoTexHH4ecKa q HoMHccuç
• Pour prix,
• voir catalogue en vigueur
For price, see current catalogue
1000-5-4 © IEC: 1996 – 3 –
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 9
2 Normative reference 9
3 Definitions 9
4 Specifications for protective devices against radiated disturbances 11
4.1 General classification for shielding devices 13
4.2 General requirements 13
4.3 Specifications 15
4.3.1 General 15
4.3.2 Barrier materials 15
4.3.3 Shielded cables and conduits 29
4.3.4 Gasketing materials 37
4.3.5 Shielding components 39
Annexes
A General theory 41
B Bibliography 54
1000-5-4 © IEC: 1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTROMAGNETIC COMPATIBILITY (EMC) —
Part 5: Installation and mitigation guidelines
Section 4: Immunity to HEMP -- Specifications for protective devices
against HEMP radiated disturbance —
Basic EMC publication
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 cooperation 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, prepared by technical committees on which
all the National Committees having a special interest therein are represented, express, as nearly as possible, an
international consensus of opinion on the subjects dealt with.
3) They have the form of recommendations for international use published in the form of standards, 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) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
6)
The IEC has not laid down any procedure concerning marking as an indication of approval and has no
responsibility when an item of equipment is declared to comply with one of its standards.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
report of one of the following types:
• type 1, when the required support cannot be obtained for the publication of an
International Standard, despite repeated efforts;
• type 2, when the subject is still under technical development or where for any other
reason there is the future but not immediate possibility of an agreement on an International
Standard;
• type 3, when a technical committee has collected data of a different kind from that which
is normally published as an International Standard, for example "state of the art".
Technical reports of types 1 and 2 are subject to review within three years of publication to
decide whether they can be transformed into International Standards. Technical reports of
type 3 do not necessarily have to be reviewed until the data they provide are considered to be
no longer valid or useful.
IEC 1000-5-4, which is a technical report of type 2, has been prepared by subcommittee 77C:
Immunity to high altitude nuclear electromagnetic pulse (HEMP), of IEC technical committee 77:
Electromagnetic compatibility.
1000-5-4 © IEC: 1996 –7–
The text of this this technical report is based on the following documents:
FDIS Repo rt on voting
77C/26/CDV 77C/36/RVC
Full information on the voting for the approval of this technical report can be found in the report
on voting indicated in the above table.
This document is issued in the type 2 Technical Report
series of publications (according to G.4.2.2 of pa
rt 1 of the
IEC/ISO Directives as a "prospective standard for
provisional application" in the field of electromagnetic
compatibility because there is an urgent requirement for
guidance on how standards in this field should be used to
meet an identified need.
This document is not to be regarded as an "International
Standard*. It is proposed for provisional application so that
information and experience of its use in practice may be
gathered. Comments on the content of this document should
be sent to the IEC Central Office.
A review of this type 2 Technical Report will be carried out
not later than three years after its publication, with the
options of either extension for a further three years or
conversion to an International Standard or withdrawal.
Annexes A and
B are for information only.
1000-5-4 © IEC: 1996 – g –
ELECTROMAGNETIC COMPATIBILITY (EMC) -
Part 5: Installation and mitigation guidelines
Section 4: Immunity to HEMP - Specifications for protective devices
against HEMP radiated disturbance -
Basic EMC publication
1 Scope
This technical report defines how protective devices for High Altitude Nuclear Electromagnetic
Pulse (HEMP) protection of civilian systems are specified. Performance requirements will be
given in future IEC standards. This technical report is intended to be used for the
harmonization of existing or future specifications issued by protective devices manufacturers,
electronic equipment manufacturers, administrative bodies and other buyers.
This technical report covers protective devices currently used for protection against HEMP
radiated EM fields. In general, parameters relevant to HEMP, that is parameters related to very
fast changes of EM fields, as a function of time, are dealt with.
2 Normative reference
The following normative document contains provisions which, through reference in this text,
constitute provisions of this technical report. At the time of publication, the edition indicated
was valid. All normative documents are subject to revision, and parties to agreements based
on this technical report are encouraged to investigate the possibility of applying the most recent
edition of the normative document indicated below. Members of IEC and ISO maintain registers
of currently valid International Standards.
IEC 50(161): 1990,
International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-
magnetic compatibility
3 Definitions
For the purpose of this technical report, the following definitions apply.
HEMP/HA-NEMP:
The two acronyms are equivalent and accepted for High Altitude Nuclear
Electromagnetic Pulse. HEMP is preferable to HA-NEMP.
barrier:
Separation used to insulate electrical circuits from electromagnetic disturbances.
(A shield is a special type of barrier.)
contact resistance:
Resistance measured in ohms between two objects in contact with each
other.
compression set:
The per cent of permanent height reduction in a material caused by
compression under specific conditions of heat, pressure and time.
corrosion resistance: Resistance to a chemical action which causes gradual destruction of
the surface of a metal by oxidation, electrolysis or chemical contamination.
cut-off frequency:
The frequency at which the magnitude of a measured characteristic
quantity has decreased to a specified fraction of its low-frequency value.
NOTE — For a waveguide it is the frequency below which electromagnetic energy is not efficiently propagated in
the guide. This frequency depends on the cross-section geometry and dimensions of the guide.
1000-5-4 © IEC: 1996 – 11 –
elongation:
The increase in length of a material stressed under tension.
point of entry:
The physical place at the surface of a closed enclosure through which the
energy penetrates.
protective device:
An electrical component such as a filter, gas discharge tube, metal oxide
varistor, etc., for protection against conducted disturbances, or a shield, gasket, waveguide
trap, etc., for protection against radiated disturbances. Such an element, or a combination of
several of them, thus forms part of the conceptual electromagnetic barrier of the system.
shield:
Electrically conductive material placed around a system circuit, component, or cable to
suppress the effect of an electromagnetic field within or beyond definite regions.
shielding effectiveness:
The measure, generally in dB, of the reduction or attenuation of the
amplitude of an electromagnetic field at a point in space before and after the placement of a
shield, between a source and this point.
skin depth:
The depth of a conductive material beyond which the current density has
decreased by one Neper (1/e or 36,8 %) in comparison with its value at the surface of the
material.
surface resistivity: The resistance of a material between two opposite sides of a unit square
of its surface, commonly expressed in ohms per square.
surface transfer impedance
(of a coaxial line): The quotient of the voltage induced in the
centre conductor of a coaxial line per unit length by the current on the external surface of the
coaxial line. [I EV 161-04-15]
tensile strength:
The maximum tensile stress applied, during stretching, to a specimen to
rupture.
transfer admittance: A mathematical relationship between the induced current on a conductor
located on the protected side of a shielded region and the voltage on the unprotected side of
the enclosure. This is the dual quantity of the transfer impedance.
transfer impedance (of a screened circuit): The quotient of the voltage appearing between two
specified points in the screened circuit by the current in a defined cross-section of the screen.
[IEV 161-04-14]
volume resistivity:
The electrical resistance between opposite faces of 1 cm 3 of material,
commonly expressed in ohms.centimetres.
waveguide below cut-off: A protective element consisting of a length of waveguide which
limits the passage of electromagnetic energy below a fixed frequency.
waveguide trap:
A waveguide below cut-off serving as an electromagnetic protection device in
a barrier.
4 Specifications for protective devices against radiated disturbances
The shielding effectiveness of a shielded enclosure (Faraday cage, cabinet or shielded
building) is violated by penetrations, openings and seams. All of these shall be treated in such
a way that the resulting degradation of the shielding effectiveness is as small as possible. This
goal is achieved by means of specific protection devices.
In the following, these protection devices are dealt with one by one, by explaining their
principles of operation, showing their limitations in some cases, and finally listing the
specifications that shall be given by the manufacturers.
1000-5-4 © IEC: 1996 – 13 –
The figures help demonstrate the principle of operation and may also serve as examples of
how the frequency-dependent parameters might be presented.
4.1
General classification for shielding devices
Barrier materials:
–
shielding materials;
–
viewing windows;
– air vent panels;
– waveguide traps;
– conductive coatings;
–
conductive adhesives and sealants.
Shielded cables and conduits:
– solid shields;
– leaky shields;
– connectors.
Gasketing materials:
–
knitted wire mesh gaskets;
– metal fibers and screen gaskets;
– oriented wire gaskets;
– conductive elastomer gaskets.
Shielding components:
– toggle boots;
– shaft seals;
– connector gaskets;
– ring seals;
– foil tapes;
– etc.
4.2
General requirements
The shielding materials needed to reach the required shielding effectiveness shall meet several
electrical, mechanical and environmental criteria.
Electrical requirements
For barrier materials, attenuation values shall be supplied for E and H fields, and for plane
waves in the frequency range 10 kHz to 1000 MHz. For gasketing materials the same
information as above is required, and in addition, the d.c. resistance shall be provided. For
shielded cables the specification of transfer impedance and, if necessary, transfer admittance
in the frequency range 10 kHz to 100 MHz is required.
Mechanical requirements
All the mechanical characteristics necessary for the correct use of the materials should be
available to the user.
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