1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 50176:2009Stationary electrostatic application equipment for ignitable liquid coating material Safety requirementsBS EN 50176:2009 BRITISH STANDARDNational forewordThis Bri
2、tish Standard is the UK implementation of EN 50176:2009. It supersedes BS EN 50176:1997, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e G E L / 3 1 / - / 1 8 , E l e c t r o s t a t i c s p r a y g u n s .A list of organizations repres
3、ented 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 2011 ISBN 978 0 580 56188 7 ICS 13.230; 87.100 Compliance with a British Standard cannot
4、 confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 50176:2009EUROPEAN STANDARD EN 50176 NORME EUROPENNE EUROPISCHE NORM Octo
5、ber 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means re
6、served worldwide for CENELEC members. Ref. No. EN 50176:2009 E English version Stationary electrostatic application equipment for ignitable liquid coating material - Safety requirements Matriels stationnaires de projection lectrostatique de produit liquide de revtement inflammable - Exigences de scu
7、rit Stationre Ausrstung zum elektrostatischen Beschichten mit entzndbaren flssigen Beschichtungsstoffen - Sicherheitsanforderungen This European Standard was approved by CENELEC on 2009-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
8、s 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
9、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
10、committees of Austria, Belgium, Bulgaria, 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
11、 United Kingdom. ICS 87.100 Supersedes EN 50176:1996BS EN 50176:2009EN 50176:2009 2 Foreword This European Standard was prepared by SC 31-8, Electrostatic painting and finishing equipment, of Technical Committee CENELEC TC 31, Electrical apparatus for potentially explosive atmospheres. The text of t
12、he draft was submitted to the formal vote and was approved by CENELEC as EN 50176 on 2009-09-01. This European Standard supersedes EN 50176:1996. 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
13、 endorsement (dop) 2010-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2012-09-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential re
14、quirements of EC Directive 94/9/EC. See Annex ZZ. CENELEC/TC 31 as the responsible committee has concluded that this new edition of EN 50176 does not contain substantial changes regarding the ESRs. The State of the Art is included in Annex ZY “Significant changes between this European Standard and E
15、N 50176:1996”. _ BS EN 50176:2009 3 EN 50176:2009 Contents 0 Introduction 4 0.1 Process .4 0.2 Explosion hazards .4 0.3 Electric hazards .4 1 Scope 5 2 Normative references 5 3 Definitions 6 4 General requirements 9 5 Requirements for the equipment .10 5.1 Electrostatic spraying systems 10 5.2 Requi
16、rements for spraying systems of category 3G .11 5.3 Special requirements for spraying systems of category 2G 12 5.4 Spraying area 13 5.5 High voltage supply .13 5.6 Electric requirements 14 5.7 Grounding measures .14 5.8 Supply for coating material 14 6 Testing .15 6.1 Tests of the high voltage cabl
17、es 15 6.2 Test of the insulating spraying material supply hose.15 6.3 Tests of the stationary equipment .15 6.4 Specific test requirements for spraying systems of type B-L, type C-L or type D-L category 2G .17 7 Information for use 18 7.1 General18 7.2 Instruction manual .18 7.3 Marking .19 7.4 Warn
18、ing sign .21 Annex A (informative) Ignitability of water-based paints .22 Bibliography 24 Annex ZY (informative) Significant changes between this European Standard and EN 50176:1996 25 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives .26 Figure Figure 1 Test assembly accord
19、ing to 6.4.2 17 Tables Table 1 Electrostatic spraying systems for ignitable and hard to ignite liquid coating materials Fields of application .10 Table 2 Requirements for electrostatic spraying systems of category 3G for ignitable and hard to ignite liquid coating materials 11 Table 3 Survey of test
20、s 15 Table 4 Test intervals 19 BS EN 50176:2009EN 50176:2009 4 0 Introduction 0.1 Process During the electrostatic coating process the liquid coating material is transported to an electrostatic spraying device where it is converted to droplets by mechanical forces and by the influence of an electric
21、 field. During this atomising process the droplets are charged by high voltage of some 10 kV and a spray cloud is generated. The charged droplets are attracted by and applied to the earthed workpiece. Droplets, which are not applied to the workpiece (overspray) are removed by a suction device or by
22、other means. After the coating process the coated workpieces are introduced into a dryer where the solvent is evaporated and a dry film of coating material is generated. 0.2 Explosion hazards An explosion could occur, if the concentration of sprayed liquid ignitable coating materials in air is withi
23、n the explosion limits, an ignition source of appropriate energy for this explosive atmosphere is present. Ignition sources could be, for instance, a hot surface, an open flame, an electric arc or a spark. An explosion could be prevented, if one or better both conditions are avoided. Because it is v
24、ery difficult to exclude the possibility of ignitable discharges completely, the main focus should be the prevention of ignitable concentrations of explosive atmosphere. 0.2.1 Mixtures of ignitable coating materials and air could only explode within a given range of concentration, but not, if the co
25、ncentration is above or below this range. NOTE If an explosive mixture of coating materials and air is trapped in a closed room, an explosion could lead to a fatal increase of pressure. 0.2.2 Particular attention should be paid to the prevention of electrostatic charges on different surfaces, which
26、are in the vicinity of the spray cloud. This could apply to workpieces during the coating process or the reciprocating devices and the mounting parts of the spraying system etc. 0.3 Electric hazards 0.3.1 Electric shock (by direct or indirect contact) could be generated, for instance, by contact wit
27、h live parts, which are not insulated for operational reasons, conductive parts, which are not under dangerous voltage during normal operation, but in case of failure, insulated live parts whose insulation is insufficient or has been damaged due to mechanical influences. 0.3.2 Inadequate grounding c
28、ould occur, for instance, due to faulty connections to the protective grounding system, a too high resistance to ground. 0.3.3 Hazards could occur, for instance, if hazardous malfunctions (e.g. shortcut of electronic safety circuits, of access guards to dangerous areas or of warning devices) occur d
29、ue to interferences of the high voltage equipment and the components of control and safety systems. 0.3.4 Hazardous electrostatic discharges could be generated, for instance, by non-earthed conductive components or by large insulating surfaces, especially if they are backed with conductive material.
30、 BS EN 50176:2009 5 EN 50176:2009 1 Scope 1.1 This European Standard specifies the requirements for stationary electrostatic application equipment for ignitable liquid coating materials and for hard to ignite liquid coating materials to be used in explosive atmospheres generated by their own spray c
31、loud. A distinction is made between spraying systems corresponding to EN 50050 and spraying systems designed for higher discharge energies and/or currents. This European Standard also specifies the design-related requirements for a safe operation of the stationary equipment including its electrical
32、installation. 1.2 This European Standard considers four types of electrostatic spraying systems; see 5.1 for more details. 1.3 This European Standard deals with all hazards significant for the electrostatic spraying of coating materials, which could also contain small quantities of added metal parti
33、cles, if the work is carried out under conditions recommended by the manufacturer. In particular, this includes ignition hazards resulting from the generated explosive atmosphere, and the protection of persons from electric shocks. 1.4 This stationary equipment is classified as equipment of group II
34、, category 2G or category 3G for use in potentially explosive areas of zone 1 or 2, respectively. NOTE For other safety aspects like zone classification of the areas in and around spray booths, see EN 12215:2004, 5.7.2.3; zone classification of other areas with explosive atmosphere, see EN 60079-10-
35、1; selection, installation and application of other electrical and non electrical equipment in areas with explosion hazard, see EN 60079-14 and EN 12215:2004, 5.7.2.5; health protection (for instance, noise), see also EN 12215:2004, 5.5 and EN 14462; cleaning of spraying areas, see instruction manua
36、l of the spraying equipment; fire prevention and protection (for instance fire hazards due to other sources) see also EN 12215:2004, 5.7.1. Design-related measures for reducing the generation of noise of the stationary equipment for electrostatic coating are given in EN ISO 11688-1. See also EN 1446
37、2. 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) applies. EN 1081, Resilient floo
38、r coverings Determination of the electrical resistance EN 1127-1, Explosive atmospheres Explosion prevention and protection Part 1: Basic concepts and methodology EN 1149-5, Protective clothing Electrostatic properties Part 5: Material performance and design requirements EN 12215:2004, Coating plant
39、s Spray booths for application of organic liquid coating materials Safety requirements EN 13463-1, Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements EN 13478, Safety of machinery Fire prevention and protection BS EN 50176:2009EN 50176:2009
40、6 EN 50050, Electrical apparatus for potentially explosive atmospheres Electrostatic hand-held spraying equipment EN 60079-0, Electrical apparatus for explosive gas atmospheres Part 0: General requirements (IEC 60079-0) EN 60204-1, Safety of machinery Electrical equipment of machines Part 1: General
41、 requirements (IEC 60204-1) EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 61340-4-1, Electrostatics Part 4-1: Standard test methods for specific applications Electrical resistance of floor coverings and installed floors (IEC 61340-4-1) EN 62061, Safety of
42、machinery Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061) EN ISO 12100-1, Safety of machinery Basic concepts, general principles for design Part 1: Basic terminology, methodology (ISO 12100-1) EN ISO 12100-2, Safety of machinery Basi
43、c concepts, general principles for design Part 2: Technical principles (ISO 12100-2) EN ISO 13849-1, Safety of machinery Safety-related parts of control systems General principles for design (ISO 13849-1) EN ISO 20344, Personal protective equipment Test method for footwear (ISO 20344) 3 Definitions
44、For the purposes of this document, the following terms and definitions apply. 3.1 stationary electrostatic application equipment for ignitable liquid coating material equipment in which the electrostatic spraying equipment is either fixed stationary (e.g. on supports) and is operated automatically o
45、r is guided by reciprocators (e.g. robots). In general, the equipment comprises the following: spray booth; spraying area; spraying system; fixtures for workpieces; conveyors; grounding system; forced ventilation; fire prevention and protection equipment 3.2 spraying system devices for application o
46、f liquid coating material by means of electrostatic charge. In general, the spraying system consists of the following compounds: device for the supply of coating material; high voltage electrode; high voltage supply system; spraying device BS EN 50176:2009 7 EN 50176:2009 3.3 high voltage supply sys
47、tem system consisting in general of the following components: low voltage section with devices for switching on and off the unit and for adjustment, control, regulation, limitation and monitoring of current and voltage, as well as the required connecting cables; high voltage generator; high voltage
48、switching device; high voltage cable; high voltage plug-and-socket connector 3.4 spraying area area, closed or not, in which the coating material is applied to the workpiece by the electrostatic spraying system 3.5 dangerous discharge discharge which generates the hazard of ignition of explosive mix
49、tures or of electric shock 3.6 workpiece article to which the coating material is applied 3.7 ignitable liquid coating materials sprayed materials, especially varnishes, which could be ignited by an effective ignition source and which continue to burn after the ignition source has been removed or may react in the form of an explosion NOTE A formula for the estimation of ignitability on the basis of the composition of the
