1、BRITISH STANDARDBS EN 50050:2006Electrical apparatus for potentially explosive atmospheres Electrostatic hand-held spraying equipmentThe European Standard EN 50050:2006 has the status of a British StandardICS 87.100g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g5
2、4g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 50050:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 50054 1National forewordT
3、his British Standard was published by BSI. It is the UK implementation of EN 50050:2006. It supersedes BS EN 50050:2001, which will be withdrawn on 1 May 2009.The UK participation in its preparation was entrusted by Technical Committee GEL/31, Equipment for explosive atmospheres, to Panel GEL/31/-/1
4、8, Electrostatic spray guns.A list of organizations represented on GEL/31/-/18 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 can
5、not confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 50050 NORME EUROPENNE EUROPISCHE NORM October 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Kom
6、itee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50050:2006 E ICS 87.100 Supersedes EN 50050:2001English version Electrical apparatus
7、 for potentially explosive atmospheres - Electrostatic hand-held spraying equipment Appareillage lectrique pour atmosphres explosibles - Equipement manuel de projection lectrostatique Elektrische Betriebsmittel fr explosionsgefhrdete Bereiche - Elektrostatische Handsprheinrichtungen This European St
8、andard was approved by CENELEC on 2006-05-01. 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 conce
9、rning 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
10、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, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
11、atvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 50050:2006 2 Foreword This European Standard was prepared by SC 31-8, Electrostatic painting and finishing equipment, of Technical Commit
12、tee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50050 on 2006-05-01. This European Standard supersedes EN 50050:2001. The following dates were fixed: latest date by which the EN has to be impl
13、emented at national level by publication of an identical national standard or by endorsement (dop) 2007-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-05-01 This European Standard has been prepared under a mandate given to CENELEC by the Eur
14、opean Commission and the European Free Trade Association and covers essential requirements of EC Directive 94/9/EC. See Annex ZZ. This European Standard specifies the constructional and test requirements for hand-held and hand-operated electrostatic spraying and associated equipment which are used t
15、o spray flammable coating materials which may form explosive atmospheres. These spraying equipment are considered to be equipment of group II, category 2 in accordance with Directive 94/9/EC. It is taken for granted that the equipment will be used in mechanically ventilated spraying areas or under e
16、quivalent ventilation conditions. _ 3 EN 50050:2006 Contents Introduction 4 1 Scope 5 2 Normative references . 6 3 Definitions 7 4 Constructional requirements. 8 4.1 General requirements for all types of spray guns . 8 4.2 Requirements only for spray guns for flammable liquid coating materials . 9 4
17、.3 Requirements only for spray guns for flammable coating powders 9 4.4 Requirements only for spray guns for flammable flock . 10 5 Type tests 10 5.1 Test requirements for all types of spray guns. 10 5.2 Ignition test for spray guns for liquid paints 11 5.3 Ignition test for non-triboelectrical spra
18、y guns for coating powders. 12 5.4 Ignition test for triboelectrical spray guns for coating powders 12 5.5 Ignition test for spray guns for flock . 12 6 Manufacturers responsibility 12 7 Marking 13 7.1 Spray gun . 13 7.2 High-voltage generator, associated equipment. 13 8 Information for users 14 8.1
19、 Instruction manual. 14 Bibliography 16 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives 17 EN 50050:2006 4 Introduction When materials are sprayed with hand-held electrostatic spraying equipment, the material is converted into a cloud of droplets or particles directed to a
20、 surface to produce there a uniform layer of the required thickness and quality. The particles are charged by high voltage of tens of kilovolts or triboelectrically so that they are attracted by the earthed workpiece and deposited on it. 5 EN 50050:2006 1 Scope 1.1 This European Standard specifies t
21、he constructional and test requirements for hand-held and hand-operated electrostatic spraying equipment and associated apparatus which can be used to spray flammable liquid coating materials, flammable coating powders or flammable flock creating explosive atmosphere in spraying areas which may or m
22、ay not contain flammable adhesives. This standard only deals with the hazards involved in the coating process when hand-held electrostatic spraying equipment is used as prescribed and in accordance with the conditions which are to be expected according to the manufacturer. As to other hazards involv
23、ed in the use of hand-held spraying equipment, the safety requirements of EN 1953:1998 shall be met. The spraying equipment shall be constructed suitable for group II category 2 as defined in EN 60079-0. 1.2 Requirements for automatic electrostatic spraying equipment for flammable coating materials
24、are laid down in EN 50176, EN 50177 and EN 50223. Hand-held electrostatic spraying equipment can be incorporated in automatic electrostatic spraying equipment provided the necessary requirements are considered. 1.3 The “General requirements“ of EN 60079-0:2006 to be applied to hand-held electrostati
25、c spray guns and to associated equipment are given in the Table 1 below: Table 1 General requirements of EN 60079-0:2006 Clause of EN 60079-0:2006 Spray guns Associated apparatus outside the hazardous area 3 Definitions Except 3.3 Except 3.3 5 Temperatures Except 5.2 No 6 General Only 6.1 Only 6.1 7
26、 Non-metallic enclosures and non-metallic parts of enclosures Only 7.4 No 8 Light-alloy enclosures Only 8.1 No 9 Fasteners Only 9.1 Only 9.1 14 Connection facilities for earthing and bonding conductors Yes Yes 15 Connection facilities and terminal compartments Yes No16 Cable and conduit entries Only
27、 16.3 No 24 Routine tests Yes Yes 25 Manufacturer responsibility Yes Yes 26 Tests of modified or repaired electrical equipment Yes Yes27 Marking Yes No Annex A Yes No 1.4 This European Standard does not deal with matters of noise created by the equipment. For this item, the requirements are laid dow
28、n in EN ISO 11688-1. EN 50050:2006 6 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 the referenced document (including any amendments
29、) applies. CLC/TR 50404 2003 Electrostatics Code of practice for the avoidance of hazards due to static electricity EN 1127-1 1997 Explosive atmospheres Explosion prevention and protection Part 1: Basic concepts and methodology EN 1953 1998 Atomising and spraying equipment for coating materials Safe
30、ty requirements EN 50176 200X 1)Automatic electrostatic spraying equipment for flammable liquid spraying materials EN 50177 2006 Automatic electrostatic spraying equipment for flammable coating powder EN 50223 2001 Automatic electrostatic application equipment for flammable flock material EN 60079 s
31、eries Electrical apparatus for explosive gas atmospheres (IEC 60079 series, mod.) EN 60079-0 2006 Electrical apparatus for explosive gas atmospheres Part 0: General requirements (IEC 60079-0:2004, mod.) EN 60079-1 200X 1)Electrical apparatus for explosive gas atmospheres Part 1: Flameproof enclosure
32、s “d“ (IEC 60079-1:200X) EN 60079-7 200X 2)Electrical apparatus for explosive gas atmospheres Part 7: Increased safety “e“ (IEC 60079-7:2006) EN 60079-11 200X 2)Electrical apparatus for explosive gas atmospheres Part 11: Intrinsic safety “i“ (IEC 60079-11:2006) EN 60529 1991 Degrees of protection pr
33、ovided by enclosures (IP Code) (IEC 60529:1989) EN 61241-1 2004 Electrical apparatus for use in the presence of combustible dust Part 1: Protection by enclosures “tD“ (IEC 61241-1:2004) EN ISO 11688-1 1998 Acoustics Recommended practice for the design of low-noise machinery and equipment Part 1: Pla
34、nning (ISO/TR 11688-1:1995) EN ISO 12100-1 2003 Safety of machinery Basic concepts, general principles for design Part 1: Basic terminology, methodology (ISO 12100-1:2003) EN ISO 12100-2 2003 Safety of machinery Basic concepts, general principles for design Part 2: Technical principles (ISO 12100-2:
35、2003) 1)At draft stage. 2)To be published. 7 EN 50050:2006 3 Definitions The following definitions, specific to electrostatic liquid coating materials, powder and flock spray guns and associated equipment, are applicable to this European Standard; they supplement the definitions which are given in E
36、N 60079. 3.1 hand-held electrostatic paint, powder or flock spraying equipment equipment for producing, charging and depositing suspended particles with the assistance of electric fields. It consists in general of the following parts: spray gun, high-voltage generator and connecting cable 3.1.1 asso
37、ciated equipment all the electrical equipment required to generate and control the electrostatic voltage of the spray gun 3.1.2 connecting cable all cables to the spray gun, including high-voltage cables 3.1.3 earth terminal terminal intended to provide means for reliable earthing of parts of an equ
38、ipment 3.1.4 high-voltage electrode conducting part of the spray gun which is at high potential and serves to directly or indirectly charge the spraying material 3.1.5 high-voltage generator part of the equipment for producing the high voltage and the corona current required NOTE The high-voltage ge
39、nerator can be incorporated in the spray gun. 3.1.6 spray gun part of the electrostatic spraying equipment from which the charged spraying material emerges and which is held and operated by the hand NOTE This part is named application device in flocking technology. 3.2 hazardous area area in which e
40、xplosive atmosphere are, or may be expected to be, present in quantities such as to require special precautions for the construction, installation and use of electrical equipment 3.3 spraying material material which is applied by means of an electrostatic hand-held spraying equipment 3.3.1 explosive
41、 atmosphere mixture with air, under atmospheric conditions, of flammable substances in the form of gas, vapour, mist, powders or flock, in which after ignition, combustion spreads throughout the unconsumed mixture EN 50050:2006 8 3.3.2 flammable spraying material material which may be ignited by con
42、tact with an effective source of ignition and which may continue to burn or explode after removal of the source of ignition 3.4 Umaxmaximum rated voltage of the high-voltage generator 3.5 workpiece article on which the spraying material is to be deposited 4 Constructional requirements 4.1 General re
43、quirements for all types of spray guns All equipment and components shall be designed and constructed according to good engineering practice and in conformity with the requirements for category 2 group II equipment as defined in EN 60079-0 to ensure avoidance of any ignition source. Requirements giv
44、en in Clause 1 of EN 60079-0:2006 result from an ignition hazard assessment which defines the category of electrical equipment. 4.1.1 In view of other hazards which are important without being treated in this standard, the equipment shall in addition be constructed in accordance with the principles
45、of EN ISO 12100 and the safety requirements of EN 1953. As category 2 equipment according to EN 60079-0, running under atmospheric conditions (0 C to + 40 C and 0,8 bar to 1,1 bar), hand-held spraying equipment meeting these requirements is suitable for use in spraying areas. 4.1.2 The handle of the
46、 spray gun shall have a contact surface area of conductive material of at least 20 cm. This surface of metal or other conductive material shall be connected to the earth terminal (see 4.1.5). The resistance of this surface to earth shall not exceed 1 M. 4.1.3 All cables shall be permanently attached
47、 to the spray gun (see 5.1.6). For flock spray guns it is sufficient that all cables are attached securely. 4.1.4 Any cable to the gun, other than those carrying only earthed intrinsically safe circuits, shall include an earthed metallic screen protected by an insulated sheath. This does not apply t
48、o guns with high voltage generator inside the gun if there are two independent cables for the earth line on two separated contacts and if the insulation of the cables is high enough to withstand spraying with the gun directly on the cable. No voltage peaks on the high voltage generator may occur dur
49、ing this process. 4.1.5 All conductive parts of the spray gun other than those designed to acquire a high potential shall be assembled so that they remain in electrical contact with each other. These metal parts shall be connected to the earth terminal in the power supply or control unit of the high-voltage generator by means of terminals of the type described in Subclause 3.1 or Subclause 3.2 of EN 60079-7:200X or other connections which are equally reliable. NOTE A method of connection between t
