IEC 60728-11:1997/AMD1:2000

Amendment 1 - Cabled distribution systems for television and sound signals - Part 11: Safety

General Information

• Status: Published
• Publication Date: 12-Oct-2000
• ICS: 33.060.40 - Cabled distribution systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 06-Jan-2005

Relations

• Amends: IEC 60728-11:1997 - Cabled distribution systems for television and sound signals - Part 11: Safety
• Effective Date: 05-Sep-2023
• Revised: IEC 60728-11:2005 - Cable networks for television signals, sound signals and interactive services - Part 11: Safety
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60728-11
AMENDMENT 1
2000-10
Amendment 1
Cabled distribution systems for television
and sound signals –
Part 11:
Safety
Amendement 1
Systèmes de distribution par câbles destinés aux signaux
de radiodiffusion sonore et de télévision –
Partie 11:
Sécurité
 IEC 2000  Copyright - all rights reserved
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
M
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60728-11 Amend. 1  IEC:2000(E)

FOREWORD
This amendment has been prepared by subcommittee 100D: Cabled distribution systems, of

IEC technical committee 100: Audio, video and multimedia systems and equipment.

The text of this amendment is based on the following documents:

FDIS Report on voting
100/159/FDIS 100/181/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until
2003. At this date, the publication will be
 reconfirmed;
 withdrawn;
 replaced by a revised edition, or
 amended.
A bilingual version of this amendment may be issued at a later date.
_________
Page 3
CONTENTS
Delete :
13 Laser radiation
Add:
Annex A (informative) Symbols
Annex B (informative) Abbreviations
Bibliography
Page 9
FOREWORD
Delete the second dashed item: “– 6.2: Due to electrical earthing conditions…”

60728-11 Amend. 1  IEC:2000(E) – 3 –

Page 13
1 Scope
Replace the existing text of this clause by the following new text:

Standards of the IEC 60728 series deal with cabled distribution systems for television, sound

and interactive multimedia signals including equipment

• for head-end reception, processing and distribution of sound and television signals and

their associated data signals, and
• for processing, interfacing and transmitting all kinds of interactive multimedia signals using
all applicable transmission media.
They cover all kinds of systems such as:
• CATV-systems,
• MATV- and SMATV-systems,
• individual receiving systems,
and all kinds of equipment installed in such systems.
The scope of these standards extends from antennas and special signal source inputs to the
head-end or other interface points, to systems as a whole, up to system outlets or terminal
inputs, where no system outlet exists.
The standardization of any user terminal (i.e. tuners, receivers, decoders, multimedia
terminals, etc.) is excluded.
This part of IEC 60728 deals with the safety requirements applicable to fixed sited systems and
equipment as described above. As far as applicable, it is also valid for mobile and temporarily
installed systems, for example caravans.
Additional requirements may apply, for example in relation to:
• protection electricity distribution systems (overhead or underground);
• 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 equipment used in the system.
2 Normative references
Add, to the existing list of normative references, the title of the following standard:
IEC 60825-2:1993, Safety of laser products – Part 2: Safety of optical fibre communication
systems
– 4 – 60728-11 Amend. 1  IEC:2000(E)

Page 15
3 Definitions
Replace definition 3.1 by the following new definition:

3.1
cabled distribution system (for television and sound signals)

the general overall term used to define CATV-systems, MATV-systems, SMATV-systems and

individual receiving systems
Page 21
Add the following new definition:
3.34
SMATV-system: Satellite Master Antenna Television distribution system
a system designed to provide sound and television signals, received by satellite receiving
antenna eventually combined with terrestrial TV and/or radio signals, to households in one or
more adjacent buildings
Page 23
4 General requirements
4.3 Laser radiation
Replace the existing text by the following new text:
If equipment embodying laser products is used, special attention shall be paid to radiation
safety. Refer to IEC 60825-1 and IEC 60825-2 for requirements and recommendations.
6 Equipotential bonding and earthing
6.1 General requirements
Replace the second paragraph by the following new text:
These bonding requirements are intended to protect only the cabled system and shall not be
considered to provide protection against electric shock (hazardous body currents) from
electrical installations.
6.2 Equipotential bonding mechanisms
Replace, on page 25, the paragraph directly after note 2 by the following new text:
When changing or removing distribution equipment or coaxial cable, care shall be taken to
avoid leakage currents from the subscriber equipment that can cause overvoltages between
the interrupted parts (inner and/or outer conductors) by opening the loop. Provision shall be
made to maintain continuity of the outer/inner conductor system while units are changed or
removed to avoid electric shock (hazardous body currents). An example is shown in figure 6.

60728-11 Amend. 1  IEC:2000(E) – 5 –

Page 27
7 Mains-supplied equipment
7.1 Equipment
Replace the first paragraph by the following new text:

The devices used in a cabled distribution system shall meet the requirements of IEC 60065,
class II equipment.
Only where the equipment supply is protected by a residual leakage detector and there is no
direct connection between the neutral supply and the protective earth, can class I equipment be
used.
NOTE   If different potentials build up between the protective conductor and the equipotential bonding terminal, for
example in older buildings, the balancing currents shall not produce excessive heat.
8 Network powering of the cabled distribution system
8.1 Line-powering
Add the following new subclause heading 8.1.1 immediately after subclause 8.1 heading:
8.1.1 Maximum allowed line-powering voltages
Replace the first sentence of new subclause 8.1.1 (formerly 8.1) by:
The line-powering voltage between the inner and outer conductors of the feeder cable shall not
exceed 65 V RMS and 120 V DC.
Add new subclause 8.1.2 as follows:
8.1.2 General provisions for equipment
The equipment shall be so designed and constructed that no dangerous current can flow under
normal operating or single-fault conditions.

Page 29
9 Protection against contact and proximity to electric power distribution
systems
Replace the last paragraph by the following new text:
For systems carrying voltages of more than 1 kV, the distance shall be at least 3 m. The cabled
distribution system shall not cross over in open air any power distribution system carrying
v
...