1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 50528:2010Insulating ladders for use onor near low voltage electricalinstallationsBS EN 50528:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implemen
2、tation of EN 50528:2010.The UK participation in its preparation was entrusted to TechnicalCommittee PEL/78, Tools for live working.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions
3、 of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 65380 3ICS 13.260; 97.145Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 3
4、1 December 2010.Amendments issued since publicationDate Text affectedBS EN 50528:2010EUROPEAN STANDARD EN 50528 NORME EUROPENNE EUROPISCHE NORM May 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechn
5、ische 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 50528:2010 E ICS 97.145;13.260 English version Insulating ladders for use on or near low voltage electrical
6、installations Echelles isolantes pour utilisation sur ou proximit des installations lectriques basse tension Isolierende Leitern fr Arbeiten an oder in der Nhe von Niederspannungsanlagen This European Standard was approved by CENELEC on 2010-05-01. CENELEC members are bound to comply with the CEN/CE
7、NELEC 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
8、 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 vers
9、ions. 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
10、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 50528:2010EN 50528:2010 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 78, Equipment and tools for live working. It was submitted to the formal vote and was approved by CENEL
11、EC as EN 50528 on 2010-05-01. 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 EN
12、 has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-05-01 _ BS EN 50528:2010 3 EN 50528:2010 Contents Introduction . 4 1 Scope
13、. 5 2 Normative references . 5 3 Terms and definitions 5 4 Requirements 7 4.1 Safety requirements . 7 4.2 Functional requirements . 7 4.3 Electrical requirements . 9 4.4 Mechanical requirements . 9 4.5 Markings . 9 4.6 Instruction for use . 9 5 Verification and testing 10 5.1 General .10 5.2 Design,
14、 dimensions, construction .11 5.3 Mechanical tests .11 5.4 Marking .12 5.5 Instruction for use .12 5.6 Electrical tests 12 6 Conformity evaluation 13 7 Modifications .13 Annex A (normative) Classification of defects and associated requirements and tests 18 Annex B (informative) In-service recommenda
15、tions .19 B.1 General .19 B.2 Use and storage .19 B.3 Inspection before use .19 B.4 Maintenance .19 Annex C (normative) General test procedure 21 Bibliography 22 Figures Figure 1 Cradle sketch plan (given as an example) 14 Figure 2 Test on stiles Configuration and type of electrodes used 15 Figure 3
16、 Examples of foot leveller device, adjustable feet and adjustable ladder stabilizer . 16 Figure 4 Example of individual standing platform . 17 Tables Table A.1 Classification of defects and associated requirements and tests . 18 Table C.1 Sequential order for performing tests . 21 BS EN 50528:2010EN
17、 50528:2010 4 Introduction Ladders covered by this European Standard are used to work on low voltage live parts, such as to perform connector fittings, repair on pole, switching actions. They are also used to carry out operations prior to dead working, as in the case of voltage detection, earthing a
18、nd short-circuiting, etc. In all these cases the ladders has two main functions, to reach the part of the installation that needs to be operated on and to protect the worker from risk of electrical injury, by providing the insulation level and maintaining the safety distance between the worker and t
19、he live or potentially live installation. Taking the local risk assessment into account, additional protection (either personal or collective) can be furthermore considered. This European Standard contributes to the safety of the users provided they are trained to the operations envisaged. Additiona
20、l requirements when using the ladders should be considered to fulfil the European Directives and national regulations. The ladder is used in accordance with EN 50110 series. This European Standard has been prepared in accordance with the requirements of EN 61477. BS EN 50528:2010 5 EN 50528:2010 1 S
21、cope This European Standard is applicable to portable ladders made of non conductive stiles, including accessories (cradle, adjustable foot, adjustable ladder stabilizer, foot leveller device, etc.) used to work on or near electrical systems and installations in the low voltage range (below 1 000 V
22、a.c./1 500 V d.c.). These ladders are used, to provide temporary access, generally on overhead line structures and to undertake electrical operations. They shall be used by one person only These ladders are not intended to be put in direct contact with energized parts nevertheless they provide suffi
23、cient insulation level to protect against inadvertent contact with low voltage live parts. The requirements and tests described in this European Standard shall be considered in addition to the EN 131 series. NOTE This European Standard does not cover ladders for applications upper than 1 000 V a.c/1
24、 500 V d.c. These products are separately covered by a specific standard (EN 61478). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of t
25、he referenced document (including any amendments) applies. EN 131-1:2007, Ladders Part 1: Terms, types, functional sizes EN 131-2:1993, Ladders Part 2: Requirements, testing, marking EN 131-3:2007, Ladders Part 3: User instructions EN 131-4:2007, Ladders Part 4: Single or multiple hinge-joint ladder
26、s EN 60068-1:1994, Environmental testing Part 1: General and guidance (IEC 60068-1:1988 + corrigendum Oct. 1988 + A1:1992) EN 61318:2008, Live working Conformity assessment applicable to tools, devices and equipment (IEC 61318:2007) EN 61477:2009, Live working Minimum requirements for the utilizatio
27、n of tools, devices and equipment (IEC 61477:2009 + corrigendum Apr. 2009) EN 61478:2001 + A1:2003, Live working Ladders of insulating material (IEC 61478:2001 + A1:2003, mod.) IEC 60417, Graphical symbols for use on equipment 3 Terms and definitions For the purposes of this document, the following
28、terms and definitions apply. NOTE 1 Further information on terminology is given in EN 131-1. NOTE 2 The term “ladder” is used in this document for “ladders for use on or near low voltage installations”. BS EN 50528:2010EN 50528:2010 6 3.1 adjustable foot adjustable device with anti-skit shoes insert
29、ed or secured on the base of the stiles in order to provide a firmly grip to the ground NOTE Function can be obtained by mean of rotatable, traversable type or other appropriate constructions. 3.2 adjustable ladder stabilizer system of support legs fitted to the ladder to reinforce stability when wo
30、rking 3.3 cradle device designed to rest on the pole on which it is positioned 3.4 fixing straps device designed to secure the ladder to the structure (pole) 3.5 foot leveller device device inserted or secured at the base of the stiles that provides stability to the ladder and/or balances automatica
31、lly the ground level differences 3.6 individual standing platform standing surface allowing to stay (and operate) at the working place 3.7 insulated material conductive material partly or totally coated with insulating material 3.8 non conductive material material either insulating or insulated 3.9
32、rung wear devices devices that reduce the friction and ease the operation of extending ladders by limiting the rung/stile contact 3.10 stile closures bottom and upper-ends caps to close the stiles 3.11 sliding guides sleeves that help to slide sections of extending ladders and avoid rim damage to th
33、e ladder stiles 3.12 sliding wheels roller devices that help to erect extending ladders and to protect walls from dents and scratches BS EN 50528:2010 7 EN 50528:2010 4 Requirements 4.1 Safety requirements The ladders shall be designed and manufactured to contribute to the safety of the users provid
34、ed they are used in accordance with the manufacturers instruction for use. Constructive arrangements shall be such as to prevent any misuse (i.e. ladders set at reverse side). Construction design shall be such as to minimise the penetration of water and dirt. The stiles shall be of electrically non
35、conductive material. The rungs (whatever their length) may be either in conductive or non conductive material. All items that could reach inadvertently live conductors and having overall dimension exceeding 300 mm shall not impair the electrical properties of the ladder. Among them are: cradle, indi
36、vidual standing platform. Any bare conductive parts (see 4.3) of these items shall not exceed 300 mm in length. This requirement excludes the following items: foot leveller device; adjustable ladder stabilizer; locking device; rope(s). The rungs shall have a non-slip surface. The shape of the rungs
37、shall be designed to ensure a firm grip for gloved hands and also a support that ensures comfort for the worker wearing shoes or boots. 4.2 Functional requirements 4.2.1 General All metallic elements shall be protected against corrosion. The complete ladder shall be as light as practicable. 4.2.2 Ro
38、pes (if any) Ropes for extending ladders shall be made of synthetic fibre. The design being polystrands (approximate diameter 10 mm) Ropes shall have a minimum breaking strength of 1 250 daN. Their length shall be such that it could be always possible to secure their free extremity at the lower rung
39、 of the base section whatever the allowed extension of the ladder. 4.2.3 Stile closures The stile closures shall be made of soft material and shall be antiskid. The stile closures at the base shall be such designed to provide a satisfactory adherence to the ground. BS EN 50528:2010EN 50528:2010 8 Th
40、ey shall be easily dismountable for replacement. 4.2.4 Pulleys (if any) Their sheaves shall have a groove wider than 10 mm. 4.2.5 Rung wear devices The rung wear devices shall be such designed they avoid any premature wearing effect of the rungs and stiles. 4.2.6 Cradle The ladder shall be equipped
41、with a cradle (an example is shown in Figure 1) avoiding that the upper rung rests on the structure. Wearable parts shall be easily dismountable for replacement and made of soft slip resistant material. Cradle shall withstand stresses without breaking. 4.2.7 Foot leveller device They shall be adjust
42、able in height on both sides of the ladder. They shall be such designed to be safely attached at the base of the ladder without causing damages to the stiles. Their shoes shall offer either soft antiskid or ice pick plates. They shall be manually or automatically locked in place and withstand the we
43、ight of the whole equipment. Example of design is given in Figure 3 a) while Figure 3 b) shows an example of leveller device equipped with adjustable feet. 4.2.8 Adjustable ladder stabilizer (if any) They shall provide extra stability by extending the base of the ladder. 4.2.9 Individual standing pl
44、atform (if any) The total overall length of the standing platform shall be in the range of 0,4 m and 1,5 m; its width shall be within 0,4 m and 1 m. The platform shall be fixed at residence to the ladder (an example is shown in Figure 4). The access side shall be equipped with mobile and interdepend
45、ent rigid top guard rails and intermediate rails. The platform shall be equipped with toe board on the three other sides. The difference in width between the external edge of the toe boards and the internal edge of the top guard rails should be less than or equal to 50 mm on each side. The height of
46、 the plinth shall be a minimum of 0,1 m. The height of the stringer shall be between 1 m and 1,1 m and the height of the under stringer shall be between 0,45 m and 0,55 m. The platform shall withstand a static load of 150 DaN. The guard rails and the floor shall withstand stresses without permanent
47、deformation dislocation or breaking. BS EN 50528:2010 9 EN 50528:2010 4.3 Electrical requirements Any electrically non conductive part of the ladder (and supplementary equipments if existing) shall withstand an electrical stress. 4.4 Mechanical requirements 4.4.1 General Ladder shall successfully pa
48、ss the mechanical tests as specified in EN 131-2. 4.4.2 Design This European Standard applies to the type of ladders as described in EN 131-1 and EN 131-4. 4.4.3 Dimensions, construction The dimensions and tolerances shall fulfil the EN 131-1 requirements. A cradle can replace the upper rung of the
49、upper part of the ladder. 4.5 Markings Additionally to the marking required by EN 131-3 each ladder shall carry the following information in a durable form: mention of 1 000 V a.c./1 500 V d.c adjacent to the double triangle symbol (symbol IEC 60417-5216 suitable for live working) (see Note); reference to this European Standard; manufacturers name or trademark; serial or batch number or month and year of fabrication. NOTE This symbol identifies any product covered by an IEC/TC 78 internatio
