BS EN 60728-11:2010 BSI Standards Publication Cable networks for television signals, sound signals and interactive services Part 11: Safety BRITISH STANDARD BS EN 60728-11:2010 National foreword This British Standard is the UK implementation of EN 60728-11:2010 It is identical to IEC 60728-11:2010 It supersedes BS EN 60728-11:2005 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/4, Cable distribution equipment and systems A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © BSI 2010 ISBN 978 580 64910 ICS 33.060.40 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2010 Amendments issued since publication Amd No Date Text affected BS EN 60728-11:2010 EUROPEAN STANDARD EN 60728-11 NORME EUROPÉENNE October 2010 EUROPÄISCHE NORM ICS 33.060.40 Supersedes EN 60728-11:2005 English version Cable networks for television signals, sound signals and interactive services Part 11: Safety (IEC 60728-11:2010) Réseaux câblés pour les signaux de télévision, les signaux sonores et les services interactifs Partie 11: Sécurité (CEI 60728-11:2010) Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste Teil 11: Sicherheitsanforderungen (IEC 60728-11:2010) This European Standard was approved by CENELEC on 2010-10-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 60728-11:2010 E BS EN 60728-11:2010 EN 60728-11:2010 -2- Foreword The text of document 100/1679/FDIS, future edition of IEC 60728-11, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60728-11 on 2010-10-01 This European Standard supersedes EN 60728-11:2005 EN 60728-11:2010 includes EN 60728-11:2005 the following significant technical changes with respect to – The list of "differences in some countries" was transferred from the "Foreword" to informative Annex D – Some new terms and definitions were added – All Figures were reworked among other things concerning equipotential bonding and earthing details and were incorporated in the text at the appropriate places – Clause 11 "Protection against atmospheric overvoltages and elimination of potential differences" was completely reworked and re-structured taking into account among other things the provisions and requirements of the EN 62305 series on "Lightning protection" – New informative Annex A on "Earth loop impedance" was added – New informative Annex C on "Examples of calculation of risk due to lightning" was added – Former Annex B on "Special conditions using IT power line networks" was re-worded and incorporated in Annex ZA as "Special National Condition in Norway" Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-07-01 – latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-10-01 For this European Standard the informative Annex D of IEC 60728-11:2010 shall be disregarded and has been replaced by the informative Annexes ZA, Special National Conditions, and ZB, A deviations Annexes ZA, ZB, and ZC have been added by CENELEC Endorsement notice The text of the International Standard IEC 60728-11:2010 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 60728-1 NOTE Harmonized as EN 60728-1 -3- BS EN 60728-11:2010 EN 60728-11:2010 Add the following annexes: Annex ZA (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 6.2 ZA.1 Norway 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 and Figure 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 ductor of the galvanic isolator for a period of not less than 20 min, the leakage current shall not exceed mA RMS Applying a continues DC voltage of 120 V between the input and the output of the outer conductor of the galvanic isolator for a period of not less than 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 6.3 ZA.2 Norway ZA.2.1 Justification In most parts of Norway, the AC mains power are built as an IT- or TT-network with a lineto-line voltage of 230 V (see Figure ZA.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) BS EN 60728-11:2010 EN 60728-11:2010 -4- L1 L2 L3 3 4 AC power distribution, IT system, line-toline voltage 230 V Voltage limiter Equipotential bonding bar Earth electrode Figure ZA.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 ZA.2.2 Equipotential bonding mechanism for cable networks ZA.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 ZA.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 ZA.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" of ISO 3864-1:2002 shall be attached to the non-metallic enclosure ZA.2.2.2 according to sign 7.4 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 m apart If the distance is closer than m, a common earth electrode between the cabinets shall be used Examples of such installations are shown in Figure ZA.4, Figure ZA.5, Figure ZA.6 and Figure ZA.7 BS EN 60728-11:2010 EN 60728-11:2010 -5- 3 >20 m minimum distance 1 Earth electrode Non-metallic enclosure Equipotential bonding bar Mains supplied equipment Transforming station High-voltage power transmission system Figure ZA.2 – Example of installations located farther than 20 m away from a transforming station 3 1 Less than 20 m minimum distance Earth electrode Non-metallic enclosure Equipotential bonding bar Remotely supplied equipment Transforming station High-voltage power transmission system Figure ZA.3 – Example of installations located closer than 20m from a transforming station BS EN 60728-11:2010 EN 60728-11:2010 -6- L1 L2 = L3 Distance between points of contact L20 m minimum distance 1 Earth electrode Non-metallic enclosure Equipotential bonding bar Mains supplied equipment Transforming station High-voltage power transmission system IEC 1167/10 IEC 1168/10 Figure D.2 – Example of installations located farther than 20 m away from a transforming station 3 1 Less than 20 m minimum distance Earth electrode Non-metallic enclosure Equipotential bonding bar Remotely supplied equipment Transforming station High-voltage power transmission system Figure D.3 – Example of installations located closer than 20m from a transforming station BS EN 60728-11:2010 60728-11 © IEC:2010(E) – 66 – L1 L2 = L3 Distance between points of contact L 600 V AC or > 750 V DC ; ≥ 40 cm distance; Isolated wire: ≥ 80 cm distance Low voltage: D.7 D.7.1 Subclause 10.1 Sweden In Sweden there is a common agreement to use fully isolated system outlets according to 10.2.2 or a galvanic insulation in the transfer point in Cable Television Networks D.7.2 UK In the UK the use of fully isolated system outlets is obligatory under the terms of the cable operating licence D.8 Subclause 10.2 – Japan The resistance to the equipotential point is not applied, because the bonding method is not used in Japan Japanese regulations specify the application of the safety terminal The safety terminal withstands a continuous AC test voltage of 000 V for a period of not less than and maintains an insulation resistance of not less than 1,0 M Ω Installation of a safety terminal at the junction point between the indoor cabling and the feeder cable of the distribution system is shown in Figure D.10 D.9 Subclause 11.1 – Japan A lightning protection system is applied in Japan for protection against atmospheric overvoltages and for the elimination of potential differences In Japan, installation of a lightning protection system is necessary in the case where the topmost height of the construction exceeds 20 m, except in those cases where the construction is inside the safety zone of another lightning protection system (see Figure D.11) BS EN 60728-11:2010 60728-11 © IEC:2010(E) – 71 – D.10 Subclause 11.2 D.10.1 Germany In Germany no local regulations exist concerning the exemption for individual receiving systems, MATV or SMATV systems D.10.2 Japan A protective bonding conductor is not used, because the bonding method is not used in Japan IEC 1710/04 Safety terminal Feeder cable Protective device Earthing conductor Figure D.10 – Example of the installation of a safety terminal in Japan BS EN 60728-11:2010 60728-11 © IEC:2010(E) – 72 – 60° 60° IEC 1711/04 Safety zone IEC 1712/04 Lightning rod Mast Figure D.11a – Mast Figure D.11b – Building Figure D.11 – Examples of installation of a lightning protection system in Japan D.11 Subclause 11.3.2 – Japan In Japan the earthing conductors have the following requirements: a) conductors for a lightning rod: ≥ 30 mm Cu; b) for an earthing resistance of ≤ 10 Ω, the diameter has to be at least 2,6 mm Cu; c) for an earthing resistance of ≤ 100 Ω, indoors, the diameter has to be at least 1,6 mm Cu or the cross-sectional area has to be at least mm Cu; d) for an earthing resistance of ≤ 100 Ω, outdoors, the diameter has to be at least 2,6 mm Cu or the cross-sectional area has to be at least 5,5 mm Cu D.12 Subclause 11.3.3 – Japan An earth termination system is not used in Japan Only a lightning protection system is applied (see Figure D.11) BS EN 60728-11:2010 60728-11 © IEC:2010(E) – 73 – D.13 Subclause 12.2 – Japan The bending moment of a mast up to m is not applied in Japan In Japan, the mast shall not be destroyed by the following wind pressures: a) for an antenna height h < 16 m, the wind pressure is 60 h , in kg per m 2; b) for an antenna height h ≥ 16 m, the wind pressure is 120 h , in kg per m D.14 Subclause 12.3 – Finland The required wind pressure value is 700 N/m for buildings up to 30 m BS EN 60728-11:2010 60728-11 © IEC:2010(E) – 74 – Bibliography IEC 60050-195:1998, International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and protection against electric shock IEC 60050-826:2004, installations International Electrotechnical Vocabulary − Part 826: Electrical IEC 60050-851:2008, International Electrotechnical Vocabulary − Part 851: Electric welding IEC 60728-1, Cable networks for television signals, sound signals and interactive services – Part 1: System performance of forward paths IEC 60728-2, Cable networks for television signals, sound signals and interactive services – Part 2: Electromagnetic compatibility for equipment IEC Guide 112, Guide on the safety of multimedia equipment EN 50174-3, Information technology – Cabling installation – Part 3: Installation planning and practices outside buildings ITU-T K.8, Separation in the soil between telecommunication cables and earthing system of power facilities _ This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI 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