Bsi bs en 60335 2 76 2005 + a2 2015

BRITISH STANDARD Household and similar electrical appliances — Safety — Part 2-76: Particular requirements for electric fence energizers     BS BS EN EN 60335-2-76:2005 60335-2-76:2005 +A2:2015 +A12:2010 Incorporating corrigenda June 2008, August 2013, April 2014 and September 2014 BS EN 60335-2-76:2005+A2:2015 National foreword This British Standard is the UK implementation of EN 60335-2-76:2005+A2:2015 It is derived from IEC 60335-2-76:2002, incorporating amendment 1:2006, amendment 2:2013 and corrigendum August 2013 It supersedes BS EN 60335-2-76:2005+A12:2010, which will be withdrawn on 29 September 2017 The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to IEC text carry the number of the IEC amendment For example, text altered by IEC amendment is indicated by !" Where a common modification to an IEC amendment has been introduced, the tags carry the number of the amendment For example, the common modifications introduced by CENELEC to IEC amendment are indicated by RS The start and finish of text introduced or altered by CENELEC amendment is indicated in the text by tags For example, the common modifications introduced by CENELEC amendment A11 are indicated by hi The UK participation in its preparation was entrusted by Technical Committee CPL/61, Safety of household and similar electrical applicances, to Subcommittee CPL/61/1, Motorised appliance group A list of organizations represented on this subcommittee 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 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 29 September 2005 © The British Standards Institution 2015 Published by BSI Standards Limited 2015 ISBN 978 580 78137 Amendments/corrigenda issued since publication Amd No Date Comments 16529 29 September 2006 See national foreword A11 30 April 2008 Implementation of CENELEC amendment A11 January 2008 30 June 2008 Correction to supersession details 31 December 2010 Implementation of CENELEC amendment A12:2010 31 August 2013 Implementation of IEC corrigendum August 2013: clause 31 corrected 30 April 2014 Correction to CENELEC common modification clause 7.12.1 30 September 2014 Corrections to clauses 7.12, 22, inclusion of clause 7.14 in Annex ZAA and re-insertion of clause 22.108 28 February 2015 Implementation of IEC amendment 2:2013 with CENELEC modifications EUROPEAN STANDARD EN 60335-2-76:2005+A2 NORME EUROPÉENNE EUROPÄISCHE NORM January 2015 ICS 65.040.99 English version Household and similar electrical appliances – Safety Part 2-76: Particular requirements for electric fence energizers (IEC 60335-2-76:2002) Appareils électrodomestiques et analogues – Sécurité Partie 2-76: Règles particulières pour les électrificateurs de clôtures (CEI 60335-2-76:2002) Sicherheit elektrischer Geräte für den Hausgebrauch und ähnliche Zwecke Teil 2-76: Besondere Anforderungen für Elektrozaungeräte (IEC 60335-2-76:2002) 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) –2– Foreword The text of document 61H/173/FDIS, future second edition of IEC 60335-2-76, prepared by SC 61H of the IEC Technical Committee 61, was submitted to the IEC-CENELEC parallel vote As a result of the Kista meeting of CENELEC TC 61 in May 2002, a draft amendment prAA containing the relevant existing common modifications was submitted to the formal vote The texts of the FDIS and the prAA were approved by CENELEC as a new edition of EN 60335-2-76 on 2004-11-01 This European Standard replaces EN 60335-2-76:1999 + A1:2001 The following dates are applicable: - - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-11-01 date on which national standards conflicting with the EN have to be withdrawn (dow) 2007-11-01 This part has to be used in conjunction with EN 60335-1, Household and similar electrical appliances – Safety – Part 1: General requirements It was established on the basis of the 2002 edition of that standard Amendments and revisions of Part have also to be taken into account and the dates when such changes become applicable will be stated in the relevant amendment or revision of Part This part supplements or modifies the corresponding clauses of EN 60335-1, so as to convert it into the European Standard: Safety requirements for electric fence energizers When a particular subclause of Part is not mentioned in this part 2, that subclause applies as far as is reasonable When this standard states "addition", "modification" or "replacement", the relevant text of Part is to be adapted accordingly NOTE The following numbering system is used: – subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1; – unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including those in a replaced clause or subclause; – additional annexes are lettered AA, BB, etc.; – subclauses, notes and annexes that are additional to those in the IEC standard are prefixed with the letter Z NOTE The following print types are used: – requirements: in roman type; – test specifications: in italic type; – notes: in small roman type Words in bold in the text are defined in Clause When a definition concerns an adjective, the adjective and the associated noun are also in bold There are no special national conditions causing a deviation from this European Standard, other than those listed in Annex ZA to EN 60335-1 There are no national deviations from this European Standard, other than those listed in Annex ZB to EN 60335-1 Endorsement notice The text of the International Standard IEC 60335-2-76:2002 was approved by CENELEC as a European Standard with agreed common modifications _ –3– BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) Foreword to amendment A1 The text of document 61H/229/FDIS, future amendment to IEC 60335-2-76:2002, prepared by SC 61H, Safety of electrically-operated farm appliances, of IEC Technical Committee 61, Safety of household and similar electrical appliances, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 60335-2-76:2005 on 2006-04-01 The following dates are applicable: - - latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-01-01 date on which national standards conflicting with the amendment have to be withdrawn (dow) 2009-04-01 This amendment supplements or modifies the corresponding clauses of EN 60335-2-76:2005 There are no special national conditions causing a deviation from this amendment There are no national deviations from this amendment Endorsement notice The text of amendment 1:2006 to the International Standard IEC 60335-2-76:2002 was approved by CENELEC as an amendment to the European Standard without any modification Foreword to amendment A11 A proposal to amend EN 60335-2-76:2005 was discussed during the Brughes meeting of CENELEC TC 61 in June 2005, when it was decided to submit a draft for an amendment to the Unique Acceptance Procedure This draft was circulated in December 2005 and was approved by CENELEC as amendment A11 to EN 60335-2-76:2005 on 2006-09-12 The following dates are applicable: – – latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement date on which the national standards conflicting with the amendment have to be withdrawn (dop) 2008-09-01 (dow) 2010-09-01 Foreword to amendment A12 A proposal to amend EN 60335-2-76:2005 was discussed during the London meeting of CENELEC TC 61 in December 2008, when it was decided to submit a draft for an amendment to the CENELEC Enquiry The results were discussed at the Sofia meeting in November 2009, when it was decided to submit a revised draft to the formal vote The text was circulated in March 2010 and was approved by CENELEC as amendment A12 to EN 60335-2-76:2005 on 2010-09-01 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 amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-09-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2013-09-01 BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) –4– Foreword to amendment A2 The text of document 61H/287/FDIS, future IEC 60335-2-76:2002/A2, prepared by IEC/SC 61H "Safety of electrically-operated farm appliances" of IEC/TC 61 "Safety of household and similar electrical appliances" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60335-2-76:2005/A2:2015 A draft amendment, which covers common modifications to IEC 60335-2-76:2002/A2, was prepared by CLC/TC 61 "Safety of household and similar electrical appliances" and approved by CENELEC Additionally CLC/TC 61 prepared EN 60335-2-76:2005/FprAE:2014 that was approved by CENELEC The following dates are fixed: – latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-09-29 – latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2017-09-29 This European Standard modifies EN 60335-2-76:2005 + A1:2006 + A11:2008 + A12:2010 This Part is to be used in conjunction with EN 60335-1:2012 including its amendments NOTE When “Part 1” is mentioned in this standard, it refers to EN 60335-1 When a particular subclause of Part is not mentioned in this part 2, that subclause applies as far as is reasonable When this standard states "addition", "modification" or "replacement", the relevant text of Part is to be adapted accordingly NOTE The following numbering system is used: – subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1; – unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including those in a replaced clause or subclause; – additional annexes are lettered AA, BB, etc.; – Clauses, subclauses, notes, tables, figures and annexes that are additional to those in the IEC standard are prefixed with the letter Z NOTE The following print types are used: - requirements: in roman type; - test specifications: in italic type; - notes: in small roman type Words in bold in the text are defined in Clause When a definition concerns an adjective, the adjective and the associated noun are also in bold There are no special national conditions causing a deviation from this European Standard, other than those listed in Annex ZA to EN 60335-1:2012 There are no national deviations from this European Standard, other than those listed in Annex ZB to EN 60335-1:2012 Annex AA is for information only Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights _ Endorsement notice The text of the International Standard IEC 60335-2-76:2002/A2:2013 was approved by CENELEC as a European Standard with agreed common modifications –5– BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) j Annex ZAA (normative) Time delayed electric fence energizers The following modifications to this standard are applicable for time delayed electric fence energizers Definitions 3.ZAA.1 time delayed electric fence energizer electric fence energizer that when a very low load impedance is detected at the output terminals, has its maximum output impulses limited for the duration of the delay time, but permits the output impulses to rise even above the normal maximum allowed value of J after the delay time 3.ZAA.2 delay time time the energizer waits before its maximum output energy is allowed to increase in response to a changed load 3.ZAA.3 adaptation time time by which an energizer output has reached steady state in response to a changed load after the delay time has elapsed Marking and instructions 7.1 Addition: The energizer shall be marked with the substance of the words "time delayed electric fence energizer" or with the symbol (see 7.6) Compliance is checked by inspection 7.6 Addition: Time delayed electric fence energizer k BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) j 7.12 –6– Addition: If the “time delayed electric fence energizer” symbol or the substance of the words “time delayed electric fence energizer” is marked on the appliance, its meaning shall be explained The instructions for energizers marked “time delayed electric fence energizer” or with the symbol shall state the delay time of the energizer using the substance of the following: This time delayed electric fence energizer has a delay time of x seconds Compliance is checked by inspection 7.14 Addition: The diameter of the circle in the symbol for time delayed electric fence energizer shall be at least 15 mm Compliance is checked by measurement 22 Construction 22.108 Replacement: 22.108 The output characteristics of time delayed electric fence energizers shall be such that • the delay time shall be between 15 s and 60 s, • the adaption time shall be less than min, • the impulse repetition rate shall not exceed Hz, • the impulse duration of the impulse in the non inductive resistor R1 of the standard load shall not exceed 10 ms, • RWhen the load at the output terminals exceeds 500 Ω, or was less than 500 Ω and then exceeds 500 Ω at least once within the delay time, the energy/impulse in the non-inductive resistor R1 of the standard load shall not exceed J and the peak current in the non-inductive resistor R1 of the standard load shall not exceed 20 A for more than 200 μs cumulated per impulse.S NOTE • The energy/impulse is the energy measured in the impulse over the impulse duration when the impedance of a load X at the output terminals has stayed below 500 Ω for more than the delay time, the output impulse energy into X shall not exceed the steady state limits given in Table ZAA.1, Table ZAA.1 – Maximum total steady state output impulse energy Impedance of load X Maximum total steady state output impulse energy Ω J ≤ 100 15 200 12,5 300 8,3 400 6,3 500 The output from the energizer shall not exceed the curve created by linearly joining the above points • RWhen a load H with an impedance variable from 175 Ω to 1500 Ω is placed in parallel with a load X, having an impedance below 500 Ω, after X has stayed at the output terminals for more than the delay time, the energy/impulse into H shall not exceed J and the peak current into H shall not exceed 20 A for more than 200 μs cumulated per impulse, for the entire delay time after load H was applied.S –7– BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) j Compliance is checked by measurement and by the following test, the energizer being operated under normal operation and supplied in accordance with 11.5: - the standard load, limited to the possible range of values above 500 Ω, is connected to the output terminals and the energy/impulse measured in the non inductive resistor R1 of the standard load shall not exceed J Rand the peak current in the non-inductive resistor R1 of the standard load shall not exceed 20 A for more than 200 μs cumulated per impulseS; - the standard load is then disconnected and successive loads X of 50 Ω, 100 Ω, 200 Ω, 300 Ω and 400 Ω and one randomly selected value between 50 Ω and 500 Ω representing a fence are connected between the output terminals and maintained until the sum of the delay time and adaptation time have elapsed Then the load X is replaced between two consecutive impulses by a 500 Ω ± Ω load for at least one impulse, and then replaced again between two consecutive impulses by the load X During the full period starting with the first impulse in the 500 Ω ± Ω load and finishing after the delay time following the return of the load X, the energy/impulse measured into the 500 Ω load and subsequently the load X, shall not exceed J Rand the peak current into the 500 Ω and subsequently the load X shall not exceed 20 A for more than 200 μs cumulated per impulseS; - the loads X are again successively connected between the output terminals for a time exceeding the sum of delay time and adaptation time The energy/impulse is continuously monitored and shall not exceed the values listed in Table ZAA.1 Then successive values of load H of 175 Ω, 300 Ω, 400 Ω, 500 Ω and 000 Ω, representing a body, are connected between two consecutive impulses in parallel to the load X for one additional delay time Until the end of each additional delay time, the energy/impulse into H shall not exceed J Rand the peak current into H shall not exceed 20 A for more than 200 μs cumulated per impulse.S 22.ZAA.1 Time delayed electric fence energizers with a maximum output energy exceeding J under Rtest conditions according to Subclause 22.108S shall incorporate the following alarm and output control function: • • If the alarm is enabled and if the impedance of the load at the output terminals of the energizer drops from above 000 Ω to below 400 Ω from one impulse to the next one and then remains below 400 Ω for more than six consecutive impulses, the alarm shall trigger and the impulse repetition rate shall decrease to less than 0,34 Hz The alarm may stop and the normal impulse repetition rate shall recover as soon as the impedance connected to the output terminals increases above 600 Ω or when it has given alarm for at least 10 and no more than 60 If the alarm has provision for the user to disable it and if the alarm is disabled, the energizer maximum energy/impulse shall not exceed R5 J and the peak current shall not exceed 20 A for more than 200 μs cumulated per impulseS and this shall be indicated by a visible means • If the energizer has an external visual or audible alarm and no internal alarm indication and if the external alarm is disconnected, the energizer maximum energy/impulse shall not exceed R5 J and the peak current shall not exceed 20 A for more than 200 μs cumulated per impulseS and this shall be indicated by a visible means The alarm shall comprise both a visual and an audible indication when activated The visual indicator shall be easily observed at a distance of 10 m from the device when placed in a typical internal laboratory setting, facing towards the observer The audible indicator shall be tested with a measuring device having A-weighted sound pressure level (see EN 61672 series) at a distance of m from the energizer and shall have a sound output of at least 55 dB During these tests the energizer shall be in its working position complete with any outer case/cover Compliance is checked by connecting a 000 Ω ± 2,5 Ω resistor to the output terminals of the energizer for at least min, and then substituting it between two consecutive impulses by a 400 Ω ± 2,5 Ω resistor.k – 35 – BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) Annexes The Annexes of Part are applicable except as follows Annex A (informative) Routine tests This Annex of Part is applicable except as follows A.2 Electric strength test Addition: #For mains-operated energizers, type A energizers, type B energizers and type C energizers an electric strength test is carried out between the supply circuit and the fence circuit, the test voltage being 10 000 V a.c., 50 Hz or 60 Hz, or 15 000 V d.c applied for s For type D energizers, an electric strength test is carried out between the battery supply circuit and the fence circuit, the test voltage being 10 000 V a.c., 50 Hz or 60 Hz, or 15 000 V d.c applied for s.$ A.3 Functional test Addition: The energizer output characteristic shall be checked by operating the energizer at rated voltage with a 500 Ω load connected across the fence terminals The energizer output characteristic shall be such that − the impulse repetition rate shall not exceed Hz; − the impulse duration of the impulse shall not exceed 10 ms; − the energy/impulse shall not exceed J ; Text deleted BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 36 – Annex B (normative) Appliances powered by rechargeable batteries This Annex of Part is applicable except as follows Addition: The modifications to 3.19, 11.7, 19 and 30.2 are not applicable – 37 – BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) Annex AA (informative) Circuit for the independent control of the switching speed of the major pulse-switching device A suitable circuit for external independent control of the switching speed of semiconductor devices used as the major pulse-switching device in the energizer, in accordance with the eighth dashed item of 19.101, is shown in Figure AA.1 The circuit is used to reference the gate signal of the major pulse-switching device to the voltage across this device so that it can be triggered at the same point in the charging cycle The reference voltage should be of such a value that the comparator is adjustable over the whole range of the energizer charging voltage, thereby allowing the switching speed to be set at any desired frequency The input impedance of the comparator circuit should be such that it does not influence the results of the test Vc Vr Op Pot Sg Key V c = Charging voltage V r = Reference voltage Sg = Gate signal Pot = Switching speed adjustor Op = Comparator Figure AA.1 – Circuit for the independent control of the switching speed of the major pulse-switching device BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 38 – Annex BB (normative) Instructions for installation and connection of electric fences BB.1 Requirements for electric animal fences Electric animal fences and their ancillary equipment shall be installed, operated and maintained in a manner that minimizes danger to persons, animals or their surroundings Electric animal fence constructions that are likely to lead to the entanglement of animals or persons shall be avoided ! WARNING: Avoid contacting electric fence wires especially with the head, neck or torso Do not climb over, through or under a multi-wire electric fence Use a gate or a specially designed crossing point." An electric animal fence shall not be supplied from two separate energizers or from independent fence circuits of the same energizer For any two separate electric animal fences, each supplied from a separate energizer independently timed, the distance between the wires of the two electric animal fences shall be at least !2,5 m." If this gap is to be closed, this shall be effected by means of electrically non-conductive material or an isolated metal barrier Barbed wire or razor wire shall not be electrified by an energizer A non-electrified fence incorporating barbed wire or razor wire may be used to support one or more off-set electrified wires of an electric animal fence The supporting devices for the electrified wires shall be constructed so as to ensure that these wires are positioned at a minimum distance of 150 mm from the vertical plane of the non-electrified wires The barbed wire and razor wire shall be earthed at regular intervals Follow the energizer manufacturer’s recommendations regarding earthing A distance of at least 10 m shall be maintained between the energizer earth electrode and any other earthing system connected parts such as the power supply system protective earth or the telecommunication system earth Connecting leads that are run inside buildings shall be effectively insulated from the earthed structural parts of the building This may be achieved by using insulated high voltage cable Connecting leads that are run underground shall be run in conduit of insulating material or else insulated high voltage cable shall be used Care must be taken to avoid damage to the connecting leads due to the effects of animal hooves or tractor wheels sinking into the ground Connecting leads shall not be installed in the same conduit as the mains supply wiring, communication cables or data cables Connecting leads and electric animal fence wires shall not cross above overhead power or communication lines Crossings with overhead power lines shall be avoided wherever possible If such a crossing cannot be avoided it shall be made underneath the power line and as nearly as possible at right angles to it – 39 – BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) If connecting leads and electric animal fence wires are installed near an overhead power line, the clearances shall not be less than those shown in Table BB1 Table BB1 – Minimum clearances from power lines for electric animal fences Power line voltage Clearance V m ≤ 000 > 000 and ≤ 33 000 > 33 000 If connecting leads and electric animal fence wires are installed near an overhead power line, their height above the ground shall not exceed m This height applies to either side of the orthogonal projection of the outermost conductors of the power line on the ground surface, for a distance of – m for power lines operating at a nominal voltage not exceeding 000 V; – 15 m for power lines operating at a nominal voltage exceeding 000 V Electric animal fences intended for deterring birds, household pet containment or training animals such as cows need only be supplied from low output energizers to obtain satisfactory and safe performance In electric animal fences intended for deterring birds from roosting on buildings, no electric fence wire shall be connected to the energizer earth electrode A warning sign shall be fitted to every point where persons may gain ready access to the conductors Where an electric animal fence crosses a public pathway, a non-electrified gate shall be incorporated in the electric animal fence at that point or a crossing by means of stiles shall be provided At any such crossing, the adjacent electrified wires shall carry warning signs Any part of an electric animal fence that is installed along a public road or pathway shall be identified at frequent intervals by warning signs securely fastened to the fence posts or firmly clamped to the fence wires The size of the warning sign shall be at least 100 mm × 200 mm The background colour of both sides of the warning sign shall be yellow The inscription on the sign shall be black and shall be either – the symbol of Figure BB1, or !− the substance of “CAUTION: Electric fence”." The inscription shall be indelible, inscribed on both sides of the warning sign and have a height of at least 25 mm Ensure that all mains-operated, ancillary equipment connected to the electric animal fence circuit provides a degree of isolation between the fence circuit and the supply mains equivalent to that provided by the energizer NOTE Ancillary equipment that complies with the requirements relating to isolation between the fence circuit and the supply mains in Clauses 14, 16 and 29 of the standard for the electric fence energizer is considered to provide an adequate level of isolation BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 40 – Protection from the weather shall be provided for the ancillary equipment unless this equipment is certified by the manufacturer as being suitable for use outdoors, and is of a type with a minimum degree of protection IPX4 BB.2 Requirements for electric security fences Electric security fences and their ancillary equipment shall be installed, operated and maintained in a manner that minimizes danger to persons, and reduces the risk of persons receiving an electric shock unless they attempt to penetrate the physical barrier, or are in the secure area without authority Electric security fence constructions that are likely to lead to the entanglement of persons shall be avoided Gates in electric security fences shall be capable of being opened without the person receiving an electric shock An electric security fence shall not be supplied from two separate energizers or from independent fence circuits of the same energizer For any two separate electric security fences, each supplied from a separate energizer independently timed, the distance between the wires of the two electric security fences shall be at least 2,5 m If this gap is to be closed, this shall be effected by means of electrically non-conductive material or an isolated metal barrier Barbed wire or razor wire shall not be electrified by an energizer Follow the energizer manufacturer’s recommendations regarding earthing The distance between any electric security fence earth electrode and other earth systems shall be not less than m, except when associated with a graded earth mat NOTE Where possible the distance between any electric security fence earth electrode and other earth systems should preferably be at least 10 m Exposed conductive parts of the physical barrier shall be effectively earthed Where an electric security fence passes below bare power line conductors, the highest metallic element shall be effectively earthed for a distance of not less than m on either side of the crossing point Connecting leads that are run inside buildings shall be effectively insulated from the earthed structural parts of the building This may be achieved by using insulated high voltage cable Connecting leads that are run underground shall be run in conduit of insulating material or else insulated high voltage cable shall be used Care must be taken to avoid damage to the connecting leads due to the effects of vehicle wheels sinking into the ground Connecting leads shall not be installed in the same conduit as the mains supply wiring, communication cables or data cables Connecting leads and electric security fence wires shall not cross above overhead power or communication lines Crossings with overhead power lines shall be avoided wherever possible If such a crossing cannot be avoided it shall be made underneath the power line and as nearly as possible at right angles to it – 41 – BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) If connecting leads and electric security fence wires are installed near an overhead power line, the clearances shall not be less than those shown in Table BB2 Table BB2 – Minimum clearances from power lines for electric security fences Power line voltage Clearance V m ≤1 000 >1 000 and ≤33 000 >33 000 If connecting leads and electric security fence wires are installed near an overhead power line, their height above the ground shall not exceed m This height applies to either side of the orthogonal projection of the outermost conductors of the power line on the ground surface, for a distance of – m for power lines operating at a nominal voltage not exceeding 000 V; – 15 m for power lines operating at a nominal voltage exceeding 000 V A spacing of 2,5 m shall be maintained between uninsulated electric security fence conductors or uninsulated connecting leads supplied from separate energizers This spacing may be less where conductors or connecting leads are covered by insulating sleeving, or consist of insulated cables rated to at least 10 kV This requirement need not apply where the separately energized conductors are separated by a physical barrier that does not have any openings greater than 50 mm A vertical separation of not less than m shall be maintained between pulsed conductors fed from separate energizers Electric security fences shall be identified by prominently placed warning signs The warning signs shall be legible from the secure area and the public access area Each side of the electric security fence shall have at least one warning sign Warning signs shall be placed – at each gate; – at each access point; – at intervals not exceeding 10 m; – adjacent to each sign relating to chemical hazards for the information of the emergency services Any part of an electric security fence that is installed along a public road or pathway shall be identified at frequent intervals by warning signs securely fastened to the fence posts or firmly clamped to the fence wires The size of the warning sign shall be at least 100 mm × 200 mm BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 42 – The background colour of both sides of the warning sign shall be yellow The inscription on the sign shall be black and shall be either – the symbol of Figure BB1, or !− the substance of “CAUTION: Electric fence”." The inscription shall be indelible, inscribed on both sides of the warning sign and have a height of at least 25 mm Ensure that all mains operated, ancillary equipment connected to the electric security fence circuit provides a degree of isolation between the fence circuit and the supply mains equivalent to that provided by the energizer NOTE Ancillary equipment that complies with the requirements relating to isolation between the fence circuit and the supply mains in Clauses 14, 16 and 29 of the standard for the electric fence energizer is considered to provide an adequate level of isolation Mains supply wiring shall not be installed in the same conduit as signalling leads associated with the electric security fence installation Protection from the weather shall be provided for the ancillary equipment unless this equipment is certified by the manufacturer as being suitable for use outdoors, and is of a type with a minimum degree of protection IPX4 – 43 – BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) Figure BB1 – Symbol for warning sign BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 44 – Annex CC (informative) Installation of electric security fences CC.1 General An electric security fence should be installed so that, under normal conditions of operation, persons are protected against inadvertent contact with pulsed conductors NOTE This requirement is primarily intended to establish that a desirable level of safety is present or is being maintained in the physical barrier NOTE When selecting the type of physical barrier, the likely presence of young children should be a factor in considering the size of openings CC.2 Location of electric security fence The electric fence should be separated from the public access area by means of a physical barrier ! Where an electric fence is installed in an elevated position, such as on the inner side of a window or skylight, the physical barrier may be less than 1,5 m high where it covers the whole of the electric fence If the bottom of the window or skylight is within a distance of 1,5 m from the floor or access level then the physical barrier need only extend up to a height of 1,5 m above the floor or access level." CC.3 Prohibited zone for pulsed conductors Pulsed conductors shall not be installed within the shaded zone shown in Figure CC1 NOTE Where an electric security fence is planned to run close to a site boundary, the relevant government authority should be consulted before installation begins NOTE CC.4 Typical electric security fence installations are shown in Figure CC2 and Figure CC3 Separation between electric fence and physical barrier Where a physical barrier is installed in compliance with CC.3 at least one dimension in any opening should be not greater than 130 mm and the separation between the electric fence and the physical barrier should be – within the range of 100 mm to 200 mm or greater than 000 mm where at least one dimension in each opening in the physical barrier is not greater than 130 mm; – greater than 000 mm where any opening in the physical barrier has all dimensions greater than 50 mm; – less than 200 mm or greater than 000 mm where the physical barrier does not have any openings NOTE These restrictions are intended to reduce the possibility of persons making inadvertent contact with the pulsed conductors and to prevent them from becoming wedged between the electric fence and the physical barrier, thereby being exposed to multiple shocks from the energizer NOTE CC.5 The separation is the perpendicular distance between the electric fence and the physical barrier Prohibited mounting Electric fence conductors should not be mounted on a support used for any overhead power line BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 45 – CC.6 Operation of electric security fence The conductors of an electric fence should not be energized unless all authorized persons, within or entering the secure area, have been informed of its location Where there is a risk of persons being injured by a secondary cause, appropriate additional safety precautions should be taken NOTE An example of a secondary cause is where a person may be expected to fall from a surface if contact is made with pulsed conductors 45° A 500 mm B Key A = B = Secure area Public access area Physical barrier Prohibited Prohibited area Electric security fence Figure CC1 – Prohibited area for pulse conductors BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 46 – B 2 A A C B B A A 500 mm 500 mm Key A = Secure area B = Public access area C = Barrier where required = Electric security fence = Physical barrier Figure CC2 – Typical constructions where an electric security fence is exposed to the public 500 mm 1 500 mm A B B 500 mm – 47 – B BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) C A 2 D E A C Key A = Secure area B = Public access area C = Barrier where required D = Glass window pane E = Skylight in roof = Electric security fence = Physical barrier Figure CC3 – Typical fence constructions where the electric security fence is installed in windows and skylights B BS EN 60335-2-76:2005+A2:2015 EN 60335-2-76:2005+A2:2015 (E) – 48 – Bibliography The bibliography of Part is applicable except as follows Addition: IEC 60335-2-86, Household and similar electrical appliances – Safety – Part 2-86: Particular requirements for electric fishing machines IEC 60335-2-87, Household and similar electrical appliances – Safety – Part 2-87: Particular requirements for electric animal stunning equipment _ This page deliberately set blank