SIST EN 60728-11:2018
(Main)Cable networks for television signals, sound signals and interactive services - Part 11: Safety
Cable networks for television signals, sound signals and interactive services - Part 11: Safety
This part of IEC 60728 deals with the safety requirements applicable to fixed sited systems
and equipment. As far as applicable, it is also valid for mobile and temporarily installed
systems, for example, caravans.
Additional requirements may be applied, for example, referring to
• electrical installations of buildings and overhead lines,
• other telecommunication services distribution systems,
• water distribution systems,
• gas distribution systems,
• lightning systems.
This standard is intended to provide specifically for the safety of the system, personnel
working on it, subscribers and subscriber equipment. It deals only with safety aspects and is
not intended to define a standard for the protection of the equipment used in the system.
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 11: Sicherheitsanforderungen
Réseaux cablés pour les signaux de télévision, les signaux sonores et les services interactifs - Partie 11: Sécurité
L'IEC 60728-11:2016 traite des exigences de sécurité applicables aux systèmes et aux équipements fixes. Elle couvre également les systèmes mobiles et provisoires, caravanes par exemple, pour les exigences qui leur sont applicables. Cette quatrième édition annule et remplace la troisième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Correction de la section minimale du conducteur de liaison dans la Figure 6, la Figure 14 et la Figure 17.
- Création de nouveaux symboles pour "dispositif de protection contre les surtensions - (OPD)" et "dispositif de protection contre les surtensions coaxial - (COPD)".
- Introduction du nouveau symbole OPD dans 3.2, la Figure 3 et la Figure 6.
- Introduction du nouveau symbole COPD dans 3.2 et la Figure 19.
- Dans 3.1, remplacement des termes CATV, MATV et SMATV par de nouveaux termes et définitions en raison des modifications de technologie et de l'utilisation de réseaux de distribution par câbles.
- Extension pour tension de téléalimentation sur la ligne de raccordement.
- Adaptation du document complet selon l'édition 2.0 de la série IEC 62305.
- Suppression de l'Annexe informative C et de la référence normative au logiciel simplifié pour le calcul du risque lié à la foudre (Annexe J de l'IEC 62305-2:2006).
- Nouveau paragraphe 10.2.6 Prise d'abonné entièrement isolée fournie au moyen d'un système FTTH.
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 11. del: Varnost
Ta del standarda IEC 60728 obravnava varnostne zahteve, ki veljajo za fiksne sisteme in opremo na mestu uporabe. Kolikor je to ustrezno, se uporablja tudi za premične in začasno nameščene sisteme, na primer v prikolici.
Dodatne zahteve lahko veljajo, kadar se na primer nanašajo na:
• električne napeljave v zgradbah in nadzemne vode,
• druge sisteme za distribucijo telekomunikacijskih storitev,
• sisteme za distribucijo vode,
• sisteme za distribucijo plina,
• sisteme razsvetljave.
Namen tega standarda je zagotoviti varnost sistema, osebja, ki ga uporablja, naročnikov in naročniške opreme. Obravnava zgolj varnostne vidike in ni namenjen opredelitvi standarda za zaščito opreme, ki se uporablja v sistemu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60728-11:2018
01-februar-2018
1DGRPHãþD
SIST EN 60728-11:2011
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 11.
del: Varnost
Cable networks for television signals, sound signals and interactive services - Part 11:
Safety
Réseaux cablés pour les signaux de télévision, les signaux sonores et les services
interactifs - Partie 11: Sécurité
Ta slovenski standard je istoveten z: EN 60728-11:2017
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
SIST EN 60728-11:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60728-11:2018
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SIST EN 60728-11:2018
EUROPEAN STANDARD EN 60728-11
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2017
ICS 33.060.40 Supersedes EN 60728-11:2010
English Version
Cable networks for television signals, sound signals
and interactive services -
Part 11: Safety
(IEC 60728-11:2016 + COR1:2016)
Réseaux de distribution par câbles pour signaux de Kabelnetze für Fernsehsignale, Tonsignale und interaktive
télévision, signaux de radiodiffusion sonore et services Dienste -
interactifs - Teil 11: Sicherheitsanforderungen
Partie 11: Sécurité (IEC 60728-11:2016 + COR1:2016)
(IEC 60728-11:2016 + COR1:2016)
This European Standard was approved by CENELEC on 2016-04-28. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60728-11:2017 E
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SIST EN 60728-11:2018
EN 60728-11:2017
European foreword
The text of document 100/2592/FDIS, future edition 4 of IEC 60728-11 prepared by Technical
Area 5 “Cable networks for television signals, sound signals and interactive services” of IEC/TC 100
“Audio, video and multimedia systems and equipment” was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 60728-11:2017.
The following dates are fixed:
• latest date by which the document has to be (dop) 2017-11-26
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-05-26
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60728-11:2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
For this European Standard the informative Annex C of IEC 60728-11:2016 shall be disregarded and
has been replaced by the Annexes ZB, A deviations and ZC, Special National Conditions.
Endorsement notice
The text of the International Standard IEC 60728-11:2016 + COR1:2016 was approved by CENELEC
as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60364 Series NOTE Harmonized as HD 60364 Series.
IEC 60728-1 NOTE Harmonized as EN 60728-1.
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SIST EN 60728-11:2018
EN 60728-11:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu
Publication Year Title EN/HD Year
- - Coaxial cables EN 50117 Series
- - Lightning Protection Components (LPC) - EN 50164-1 -
Part 1: Requirements for connection
components
- - Lightning Protection Components (LPC) - EN 50164-2 -
Part 2: Requirements for conductors and
earth electrodes
- - Information technology - Cabling EN 50174-2 -
installation -
Part 2: Installation planning and practices
inside buildings
- - Telecommunications bonding networks EN 50310 -
for buildings and other structures
IEC 60065 (mod) 2014 Audio, video and similar electronic EN 60065 2014
apparatus - Safety requirements
IEC 60364-1 - Low-voltage electrical installations - HD 60364-1 -
Part 1: Fundamental principles,
assessment of general characteristics,
definitions
IEC 60364-4-44 - Low-voltage electrical installations - HD 60364-4-442 -
Part 4-44: Protection for safety - Protection
against voltage disturbances and
electromagnetic disturbances
IEC 60364-5-52 - Low-voltage electrical installations - HD 60364-5-52 -
Part 5-52: Selection and erection of
electrical equipment - Wiring systems
IEC 60364-5-54 - Low-voltage electrical installations - HD 60364-5-54 -
Part 5-54: Selection and erection of
electrical equipment - Earthing
arrangements and protective conductors
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SIST EN 60728-11:2018
EN 60728-11:2017
Publication Year Title EN/HD Year
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60728-2 - Cable networks for television signals, EN 50083-2 -
sound signals and interactive services -
Part 2: Electromagnetic compatibility for
equipment
IEC 60825-1 - Safety of laser products - EN 60825-1 -
Part 1: Equipment classification and
requirements
IEC 60825-2 - Safety of laser products - EN 60825-2 -
Part 2: Safety of optical fibre
communication systems (OFCS)
IEC 60950-1 (mod) 2005 Information technology equipment - Safety EN 60950-1 2006
- Part 1: General requirements
+A11 2009
+A12 2011
+AC 2011
IEC 60990 - Methods of measurement of touch current EN 60990 -
and protective conductor current
1)
IEC 61140 2001 Protection against electric shock - EN 61140 2002
Common aspects for installation and
1)
+A1 (mod) 2004 +A1 2006
equipment
IEC 62305 Series Protection against lightning EN 62305 Series
IEC 62305-2 (mod) 2010 Protection against lightning - EN 62305-2 2012
Part 2: Risk management
IEC 62305-3 (mod) 2010 Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and
life hazard
IEC 62305-4 (mod) 2010 Protection against lightning - EN 62305-4 2011
Part 4: Electrical and electronic systems
within structures
ISO 3864-1 2011 Graphical symbols - Safety colours and - -
safety signs -
Part 1: Design principles for safety signs
and safety markings
1)
Superseded by EN 61140:2016 (IEC 61140:2016): DOW = 2019-05-27.
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EN 60728-11:2017
Annex ZB
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside
the competence of the CENELEC national member.
This European Standard does not fall under any Directive of the EU.
In the relevant CEN-CENELEC countries, these A-deviations are valid instead of the provisions of the
European Standard until they have been removed.
Clause Deviation
9 ZB.1 France
(Arrêté interministériel, 2 April 1991)
This regulation specifies, among many other parameters, the minimum distance between
electric supply wires (isolated and not isolated, low-voltage and high-voltage) and any
other installation (e.g. buildings, antennas, telecommunication lines, etc.).
The main clauses of this regulation which concern the cable networks are Clauses 12, 25,
26, 33, 33bis, 38, 49, 51, 52 and 63.
Clause 9 of this standard specifies distances of 10 mm (indoors) and 20 mm (outdoors)
and this is not sufficient to cover overhead cables. As an example, the minimum distance
between an overhead telecommunication line and an overhead low-voltage (up to 1 kV)
electricity supply line shall be 1 m (Clause 33). This distance may be reduced under
specified conditions (Clauses 51, 52 and 63).
This regulation specifies also the minimum distance from high-voltage lines. This distance
varies from 1 m to 4 m depending on the voltage, on the isolation of the cable and on the
location (built-up area or not) (Clauses 33 and 63)
10.1 ZB.2 United Kingdom
In the UK the use of fully isolated system outlets is obligatory.
11
ZB.3 France
(NF C 15100 - Décret n° 84-74 du 26 janvier 1984 modifié)
The use of TT distribution systems with 300 mA differential switching is not compatible
with the interconnection of the earthing of two different buildings.
5
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EN 60728-11:2017
Annex ZC
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a
long period, e.g. climatic conditions, electrical earthing conditions.
NOTE If it affects harmonization, it forms part of the European Standard.
For the countries in which the relevant special national conditions apply these provisions are
normative, for other countries they are informative.
Clause Special National Condition
ZC.1 Norway
6.2
The following parts of the standard are not applicable due to Special National Conditions:
• For new and rebuilt coaxial electronic communication networks the outer
conductor of the coaxial cable leading into a building shall be galvanic and
isolated from the outer conductor of the coaxial cable inside the building;
• Examples of installations inside buildings described in 6.2g, 6.2i, 6.2l and shown in
Figure 2, Figure 4, Figure 5 and Figure 7 shall be equipped with a galvanic isolator
separating local earth from the cable network distribution lines;
• Galvanic isolators shall withstand the following requirements:
• Applying a 50 Hz AC voltage of 300 V RMS between the input and the output of
the outer conductor of the galvanic isolator for a period of not less than 20 min, the
leakage current shall not exceed 8 mA . Applying a continues DC voltage of 2 120 V
RMS
between the input and the output of the outer conductor of the galvanic isolator for a
period of not less than 1 min, the leakage current shall not exceed 0,7 mA.
It shall not be possible to touch metallic parts of the galvanic isolator when connected.
ZC.2 Norway
6.3
ZC.2.1 Justification
In most parts of Norway, the AC mains power are built as an IT- or TT-network with a line-
to-line voltage of 230 V (see Figure ZC.1).
These types of networks have no N-conductor, and the AC mains power is supplied to the
equipment from two of the three line conductors (IEC 60950-1:2005, Annex V).
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11
L1L1
L2L2
L3L3
22
33
33
44
44
1 AC power distribution, IT system, line-to- 2 Voltage limiter
line voltage 230 V
3 Equipotential bonding bar 4 Earth electrode
Figure ZC.1 – IT power distribution system in Norway
For a cable network covering an area with this type of power supply networks, special
initiative should be taken to ensure that safety in the cable network is maintained. The
following equipotential bonding arrangements described will provide necessary safety in
such a network.
ZC.2.2 Equipotential bonding mechanism for cable networks
ZC.2.2.1 Installations in the vicinity of transformer stations
Any earth electrode in a cable network shall preferably be located at a minimum distance of
20 m from the nearest earth electrode in a high-power transformer station (high to mains
voltage) (see Figure ZC.2 and ITU-T K.8 or EN 50174-3).
If the above-mentioned distance is less than 20 m, all equipment in the cable network shall
be electrically isolated from local earth by mounting the equipment within a non-metallic
enclosure, as shown in Figure ZC.3. Mains powered equipment with local power feeding
should not be used in this case.
Before any work on the installation is started, measurements shall be carried out to reveal if
there are any hazardous voltages between local earth and the earth for the cable network.
The safety sign "Warning about hazardous electrical voltage" according to sign 7.4
of ISO 3864-1:2002 shall be attached to the non-metallic enclosure.
ZC.2.2.2 Cabinets for cable networks located near cabinets/
installations for mains
Cabinets for cable networks placed together with cabinets for mains power distributions
should preferably be placed at a minimum of 2 m apart. If the distance is closer than 2 m, a
common earth electrode between the cabinets shall be used. Examples of such installations
are shown in Figure ZC.4, Figure ZC.5, Figure ZC.6 and Figure ZC.7.
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66
55 22
44
33
33
11
11
>>2200 mm m miininimmumum di dissttaancncee
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Transforming station 6 High-voltage power transmission
system
Figure ZC.2 – Example of installations located farther than 20 m
away from a transforming station
66
55
22 44
33
33
11
11
LLesess ts thhanan 2 20 m0 m
mmiininimmumum di dissttaancncee
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Transforming station 6 High-voltage power transmission
system
Figure ZC.3 – Example of installations located closer than 20 m
from a transforming station
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EN 60728-11:2017
L1L1L1
L2L2L2
555
222
L3L3L3
===
444
DDiiststanance ce bbetetwweeneen
poipoinnttss oof f coconnttactact
LL < < 2 2 mm
333 333
111
1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZC.4 – Example of cabinets for cable network with locally fed equipment
and mains placed less than 2 m apart
L1L1
L2L2
55
22
L3L3
44
DDiiststanancce e bbetetwweeenen
ppooiinnttss ofof coconnttacactt
LL < < 2 2 m m
33
33
11
1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZC.5 – Example of cabinets for cable network with remotely fed
equipment and mains placed less than 2 m apart
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EN 60728-11:2017
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZC.6 – Example of cabinets for cable network with locally fed equipment
and mains placed more than 2 m apart
L1L1
L2L2
55
22
L3L3
DDiiststanance ce
44 bbetetwweeneen popoiintntss
oof f coconnttactact
LL > > 2 2 mm
33 33
11 11
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZC.7 – Example of cabinets for cable network with remotely fed
equipment and mains placed more than 2 m apart
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ZC.2.3 Use of galvanic isolation in a cable network with remote power-
feeding
When using galvanic isolation in cable networks with remote power feeding, the amplifier
shall be placed in front of the galvanic isolator as shown in Figure ZC.8.
22
11
55 66
33
44
1 Galvanic isolator 2 Non-metallic enclosure
3 Voltage dependent protection device 4 Common earth electrode
5 CATV system 6 House internal cable-TV network
Figure ZC.8 – Example of an installation placing the amplifier in front
of the galvanic isolator
A voltage dependent protective device is recommended in order to protect the galvanic
isolator from transient voltages.
The amplifier shall be electrically isolated from the local electrical earth. In case the amplifier
is mounted close to either local electrical earth or installations connected to local electrical
earth, the amplifier shall be placed in such a way that it is not possible to physically touch
both the amplifier and the installation without having to remove a cover or other safety
arrangements. The covers and amplifiers shall be labelled with the safety sign given under
ZC.2.2.1. The covers used shall be designed in such a way that they can only be removed
using a key or a special tool.
ZC.2.4 Use of voltage dependent protective device in a cable network
Network, property and health shall be protected against failure in isolation between
infrastructures with different levels of voltage and other unwanted high voltages caused by
any kind of high voltage distribution networks or atmospheric discharges.
Depending on the voltages time span, all voltages with local earth as a reference shall be
limited according to following values:
0 to 200 ms 1 030 V
201 to 350 ms 780 V
351 to 500 ms 650 V
501 to 1 000 ms 430 V
1 001 to 2 000 ms 300 V
2 001 to 3 000 ms 250 V
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3 001 to 5 000 ms 200 V
5 001 to 10 000 ms 150 V
More than 10 000 ms 60 V
In Norway, network installations with no mains supplied equipment are usually installed
isolated from local earth due to difficult ground conditions. When calculations show that the
voltage level will rise above 650 V, measures must be taken to reduce the voltage level.
This can be done by connecting a voltage dependent device between the network
installation and local earth. The voltage dependent device must not connect the installations
to local earth in case of a short circuit in mains power.
This implies a safe threshold voltage of 420 V.
Examples of protections using a voltage depending device are shown in Figure 3 and
Figure ZC.9.
55
1 1
22
33
44
1 Amplifier / passive equipment 2 Equipotential bonding conductor
3 Voltage dependent protection device 4 Common earth electrode
5 Pylon
Figure ZC.9 – Example of protection using a voltage depending device on
network installations on poles
ZC.3 Finland
12.3
2
The required wind pressure value is 700 N/m for buildings up to 30 m.
12
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SIST EN 60728-11:2018
IEC 60728-11
®
Edition 4.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
Réseaux de distribution par câbles pour signaux de télévision, signaux de
radiodiffusion sonore et services interactifs –
Partie 11: Sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.060.40 ISBN 978-2-8322-3161-6
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60728-11:2018
– 2 – IEC 60728-11:2016 © IEC 2016
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 9
3 Terms, definitions, symbols and abbreviations . 10
3.1 Terms and definitions . 10
3.2 Symbols . 17
3.3 Abbreviations . 17
4 Fundamental requirements. 18
4.1 General . 18
4.2 Mechanical requirements . 19
4.3 Accessible parts . 19
4.4 Laser radiation . 19
5 Protection against environmental influences . 19
6 Equipotential bonding and earthing . 19
6.1 General requirements . 19
6.2 Equipotential bonding mechanisms . 19
6.3 Equipotential bonding in meshed systems . 30
6.3.1 References to other standards . 30
6.3.2 General on AC mains . 30
6.3.3 AC power distribution and connection of the protective conductor . 30
6.3.4 Dangers and malfunction . 30
6.3.5 Measures . 31
7 Mains-supplied equipment . 31
8 Remote power feeding in cable networks. 32
8.1 Remote power feeding . 32
8.1.1 Maximum allowed voltages . 32
8.1.2 General requirements for equipment . 32
8.1.3 Current-carrying capacity and dielectric strength of the components . 32
8.2 Remote powering from subscriber premises . 33
9 Protection against contact and proximity to electric power distribution systems . 33
9.1 General . 33
9.2 Overhead lines . 33
9.2.1 Overhead lines up to 1 000 V . 33
9.2.2 Overhead lines above 1 000 V . 34
9.3 House installations up to 1 000 V. 34
10 System outlets and transfer points . 34
10.1 General . 34
10.2 System outlet . 35
10.2.1 Types of system outlets . 35
10.2.2 Fully isolated system outlet . 35
10.2.3 Semi-isolated system outlet . 35
10.2.4 Non-isolated system outlet with protective element . 35
10.2.5 Non-isolated system outlet without protective element . 36
10.2.6 Fully-isolated system outlet provided by means of a FTTH system . 36
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SIST EN 60728-11:2018
IEC 60728-11:2016 © IEC 2016 – 3 –
10.3 Transfer point . 36
11 Protection against atmospheric overvoltages and elimination of potential
differences . 37
11.1 General . 37
11.2 Protection of the antenna system . 38
11.2.1 Selection of appropriate methods for protection of antenna systems . 38
11.2.2 Building equipped with a lightning protection system (LPS) . 39
11.2.3 Building not equipped with an LPS . 47
11.3 Earthing and bonding of the antenna system . 51
11.3.1 Internal protection system . 51
11.3.2 Earthing conductors . 51
11.3.3 Earth termination system . 54
11.4 Overvoltage protection . 56
12 Mechanical stability . 57
12.1 General requirements . 57
12.2 Bending moment . 58
12.3 Wind-pressure values . 59
12.4 Mast construction . 59
12.5 Data to be published . 59
Annex A (informative) Earth loop impedance . 61
A.1 General . 61
A.2 Earthing for fault conditions . 61
A.3 Earthing to protect against hazardous touch voltage . 62
A.4 Temporary safety measures . 63
Annex B (informative) Use of shield wires to protect installations with coaxial cables . 64
B.1 General . 64
B.2 Soil quality determines shield-wiring necessity . 64
B.3 Protective measures against direct lightning strikes on under ground cables . 64
Annex C (informative) Differences in some countries . 67
C.1 Subclause 6.1 .
...
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