SIST EN 50223:2010
(Main)Stationary electrostatic application equipment for ignitable flock material - Safety requirements
Stationary electrostatic application equipment for ignitable flock material - Safety requirements
This European Standard specifies requirements for automatic electrostatic flock application equipment which is used for applying ignitable flock which may form explosive atmospheres in the flock application area. In this connection a distinction is made between flock application devices which due to their type of construction comply with requirements as laid down in EN 50050:2001 as applicable, and those for which higher discharge energies are stipulated. This European Standard also specifies the constructional requirements for a safe operation of the stationary equipment of flock application booth, including the electrical installations. This European Standard deals with all significant hazards, hazardous situations and events relevant to flock application booths, when they are used as intended and under conditions foreseen by the manufacturer (see Clause 4).
Stationäre elektrostatische Beschichtungsanlagen für entzündbaren Flock - Sicherheitsanforderungen
Matériel fixe de projection électrostatique de flock ignitable - Exigences de sécurité
1.1 La présente Norme Européenne spécifie des exigences relatives au matériel automatique de projection électrostatique de flock conçu pour projeter du flock inflammable susceptible de former des atmosphères explosives dans l’emplacement de projection de flock. Dans ce contexte, une distinction est faite entre les dispositifs de projection de flock qui, du fait de leur type de construction, satisfont aux exigences établies dans la EN 50050 lorsqu'elles sont applicables, et ceux pour lesquels des énergies de décharge plus élevées sont stipulées. La présente Norme Européenne spécifie également les exigences de construction relatives au fonctionnement sécurisé du matériel fixe des cabines de projection de flock, y compris les installations électriques et les accessoires. La présente Norme Européenne traite de tous les dangers significatifs, les situations et les événements dangereux inhérents aux cabines de projection de flock utilisées selon l’usage et dans des conditions considérées comme des conditions de dysfonctionnement par le constructeur (voir l’Article 4). 1.2 La présente Norme Européenne considère quatre types de systèmes de projection électrostatique de flock. Pour plus de détails, voir le Tableau 1. 1.3 La présente Norme Européenne traite des dangers survenant lors de la projection électrostatique automatique de flock en installation fixe. Ces dangers comprennent surtout les dangers d’inflammation de l’atmosphère explosive générée et le danger encouru par les personnes. 1.4 Le matériel fixe traité dans la présente Norme Européenne est considéré comme appartenant au groupe II, catégorie 3D, prévu pour être utilisé dans des emplacements présentant des dangers d'explosion potentiels de la Zone 22. 1.5 Dans le cas de mélanges hybrides, le matériel fixe traité dans la présente Norme Européenne est également considéré comme appartenant au groupe II, catégorie 3G, prévu pour être utilisé dans des emplacements présentant un danger d'explosion potentiel de la Zone 2. 1.6 La présente Norme Européenne ne s’applique pas - aux systèmes de flock fonctionnant sous une tension alternative, - au système de projection destiné aux substances liquides ou pâteuses (par exemple, de la colle, du primaire), - au nettoyage des cabines de projection de flock, - au stockage et à la manutention des substances inflammables en dehors du site de revêtement.
Vgrajena oprema za elektrostatični nanos gorljivih kosmičastih materialov - Varnostne zahteve
Ta evropski standard določa zahteve za avtomatsko opremo za elektrostatični nanos kosmičev, ki se uporablja za nanašanje gorljivih kosmičev, kateri lahko tvorijo eksplozivne atmosfere na področju, kjer se nanašajo kosmiči. V zvezi s tem se razlikuje med napravami za nanašanje kosmičev, ki zaradi svojega tipa konstrukcije izpolnjujejo zahteve, določene kot veljavne v EN 50050:2001, in med tistimi, za katere so določene večje energije razelektritve. Ta evropski standard določa tudi konstrukcijske zahteve za varno obratovanje vgrajene opreme kabine za nanos kosmičev, vključno z njenimi električnimi inštalacijami. Ta evropski standard obravnava vse velike nevarnosti, nevarne situacije in primere, ki se nanašajo na kabine za nanos kosmičev, kadar se uporabljajo v skladu z namembnostjo in pod pogoji, kot jih je predvidel proizvajalec (glej Klavzulo 4).
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stationäre elektrostatische Beschichtungsanlagen für entzündbaren Flock - SicherheitsanforderungenMatériel fixe de projection électrostatique de flock ignitable - Exigences de sécuritéStationary electrostatic application equipment for ignitable flock material - Safety requirements87.100Oprema za nanašanje premazovPaint coating equipment29.260.20Electrical apparatus for explosive atmospheresICS:Ta slovenski standard je istoveten z:EN 50223:2010SIST EN 50223:2010en,fr,de01-november-2010SIST EN 50223:2010SLOVENSKI
STANDARD
SIST EN 50223:2010
EUROPEAN STANDARD EN 50223 NORME EUROPÉENNE
EUROPÄISCHE NORM May 2010
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 50223:2010 E
ICS 29.260.20; 87.100 Supersedes EN 50223:2001
English version
Stationary electrostatic application equipment
for ignitable flock material -
Safety requirements
Matériel fixe de projection électrostatique de flock ignitable -
Exigences de sécurité
Stationäre elektrostatische Flockanlagen für entzündbaren Flock -
Sicherheitsanforderungen
This European Standard was approved by CENELEC on 2010-05-01. 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 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.
SIST EN 50223:2010
EN 50223:2010 - 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. It was submitted to the formal vote and was approved by CENELEC as EN 50223 on 2010-05-01. This document supersedes EN 50223:2001. The State of the Art is included in Annex ZY “Significant changes between this European Standard and EN 50223:2001” 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)
2011-05-01 – latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2013-05-01 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 requirements of EC Directives 2006/42/EC (see Annex ZZA) and 94/9/EC (see Annex ZZB). __________ SIST EN 50223:2010
- 3 - EN 50223:2010 Contents Page Introduction . 5 1 Scope . 5 2 Normative references . 5 3 Definitions . 7 4 List of significant hazards . 13 4.1 General . 13 4.2 Mechanical hazards . 13 4.3 Electrical hazards . 14 4.4 Hazards generated by noise . 14 4.5 Hazards resulting from dangerous substances . 15 4.6 Fire hazards . 15 4.7 Explosion hazards . 15 4.8 Hazards by malfunctions of the control system . 16 4.9 Hazards by failure of energy supply . 16 5 Safety requirements and/or measures . 16 5.1 General requirements for electrostatic flock application systems . 16 5.2 Categorisation of electrostatic flock application systems . 16 5.3 Equipment requirements for flock application systems of category 3. 17 5.4 Requirements for the high voltage supply . 18 5.5 Requirements for the flock application booth . 19 6 Testing . 27 6.1 Type test of the high voltage cables . 27 6.2 Routine tests of the stationary equipment . 27 6.3 Testing of the requirements for the flock application booth . 29 7 Information for use . 31 7.1 General . 31 7.2 Instruction manual . 31 7.3 Marking of the flock application system . 34 7.4 Marking of the flock application booth . 36 Annex A (normative)
Determination of the concentration of ignitable
flock material in terms of LEL . 37 A.1 Calculation . 37 A.2 Examples of calculation – Determination of concentration of ignitable flock material based on a given average design air velocity . 38 Annex B (normative)
Determination of concentration of ignitable solvents in terms of LEL . 39 B.1 Calculation . 39 B.2
Example for calculation - Determination of fresh air flow based on
a design concentration value . 40 Annex C (normative)
Classification of hazardous zones for explosive atmosphere . 41 C.1 Classification of hazardous areas for explosive atmosphere, in which only flock-air mixtures
can occur . 42 C.2 Classification of hazardous areas for explosive atmosphere, in which hybrid mixtures can occur (in addition to figure C.1) . 43 Annex D (informative)
Example of marking . 43 Annex ZZA (informative)
Coverage of Essential Requirements of EU Directive 2006/42/EC . 44 Annex ZZB (informative)
Coverage of Essential Requirements of EU ATEX Directive 94/9/EC . 46 Annex ZY
(informative)
Significant changes between this European Standard and EN 50223:2001 . 47 SIST EN 50223:2010
EN 50223:2010 - 4 - Bibliography . 48 Figures Figure C.1 — Flock application booth with closed flock recovery system . 41 Figure C.2 — Flock application booth with open or closed flock recovery system, solvent concentration below 20 % of LEL . 42 Tables Table 1 – Electrostatic flock application systems for ignitable flock – Overview . 16 Table 2 – Requirements for electrostatic flock application systems of category 3
for ignitable flock. 17 Table 3 – Survey of tests . 27 Table 4 – Test intervals . 34
SIST EN 50223:2010
- 5 - EN 50223:2010 Introduction
In the process of electrostatic flock application, the flock is transported from a reservoir through an electrical field either by gravitational forces or an air stream or electrostatic forces. As the flock particles disperse due to the flock application device and/or the electric field, they are electrostatically charged by means of high voltage of some tens of kilovolts aligned and, in the form of a cloud, encased by and deposited on the grounded workpiece. They stick to those workpieces, which are covered with an adhesive layer. The adhesive is set at room temperature or by heating. Flock particles not deposited on the workpiece (overspray) are upcast or removed by the exhaust ventilation system, by brushes or other devices into the flock recovery system. 1 Scope 1.1 This European Standard specifies requirements for automatic electrostatic flock application equipment which is designed for applying ignitable flock which may form explosive atmospheres in the flock application area. In this context a distinction is made between flock application devices which due to their type of construction comply with the requirements as laid down in EN 50050 as applicable, and those for which higher discharge energies are stipulated. This European Standard also specifies the constructional requirements for a safe operation of the stationary equipment of flock application booths, including the electrical installations and the accessories. This European Standard deals with all significant hazards, hazardous situations and events relevant to flock application booths, when they are used as intended and under conditions which are foreseeable as malfunction by the manufacturer (see Clause 4). 1.2 This European Standard considers four types of electrostatic flock systems. For more details, see Table 1. 1.3 This European Standard deals with those hazards occurring during stationary automatic electrostatic flocking. Among these hazards are, above all, ignition hazards of the generated explosive atmosphere and hazard to persons. 1.4 The stationary equipment dealt with in this European Standard is considered to be equipment of group II, category 3D for the use in areas with potential explosion hazards of zone 22. 1.5 In cases of hybrid mixtures, the stationary equipment dealt with in this European Standard is also considered as equipment of group II, category 3G for the use in areas with potential explosion hazard of zone 2. 1.6 This European Standard is not applicable for - flock systems operated with AC voltage, - the application system for liquid or pasty substances (e.g. adhesives, primer), - the cleaning of flock application booths, - the storage and handling of ignitable substances outside the coating plant. 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 50050:2006, Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment EN 60079-0:2006 1), Electrical apparatus for explosive gas atmospheres - Part 0: General requirements (IEC 60079-0:2004, mod.) EN 60204-1:2006 + A1:2009, Safety of machinery - Electrical equipment of machines - Part 1: General requirements (IEC 60204-1:2005 + A1:2008)
1) Superseded by EN 60079-0:2009 “Explosive atmospheres - Part 0: Equipment - General requirements” (IEC 60079-0:2007) SIST EN 50223:2010
EN 50223:2010 - 6 - EN 60529:1991 + A1:2000, Degrees of protection provided by enclosures (IP code)
(IEC 60529:1989 + A1:1999) EN 61241-0:2006, Electrical apparatus for use in the presence of combustible dust - Part 0: General requirements (IEC 61241-0:2004, mod. + corr. Nov. 2005) EN 61241-10:2004, Electrical apparatus for use in the presence of combustible dust - Part 10: Classification of areas where combustible dust are or may be present (IEC 61241-10:2004) EN 61340-4-1:2004, Electrostatics - Part 4-1: Standard test methods for specific applications - Electrical resistance of floor coverings and installed floors (IEC 61340-4-1:2003) EN 62061:2005, Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems (IEC 62061:2005) EN 619, Continuous handling equipment and systems - Safety and EMC requirements for equipment for mechanical handling of unit loads EN 746-1:1997 + A1:2009, Industrial thermoprocessing equipment - Part 1: Common safety requirements for industrial thermoprocessing equipment EN 953, Safety of machinery - Guards - General requirements for the design and construction of fixed and movable guards EN 981, Safety of machinery - System of auditory and visual danger and information signals EN 1037, Safety of machinery - Prevention of unexpected start-up EN 1081:1998, Resilient floor coverings - Determination of the electrical resistance EN 1127-1:2007, 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 12445, Industrial, commercial and garage doors and gates - Safety in use of power operated doors - Test methods EN 12453, Industrial, commercial and garage doors and gates - Safety in use of power operated doors – Requirements EN 12635, Industrial, commercial and garage doors and gates - Installation and use EN 12978, Industrial, commercial and garage doors and gates - Safety devices for power operated doors and gates - Requirements and test methods EN 13463-1:2009, Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements EN 13478:2001 + A1:2008, Safety of machinery - Fire prevention and protection EN 13501-1 + A1, Fire classification of construction products and building elements - Part 1: Classification using data from reaction to fire tests EN 14373, Explosion suppression systems EN 14460, Explosion resistant equipment EN 14462, Surface treatment equipment - Noise test code for surface treatment equipment including its ancillary handling equipment - Accuracy grades 2 and 3 EN 14491, Dust explosion venting protective systems EN 14797, Explosion venting devices EN 14986, Design of fans working in potentially explosive atmospheres EN 15089, Explosion isolation systems EN ISO 12100-1:2003 + A1:2009, Safety of machinery - Basic concepts, general principles for design – Part 1: Basic terminology, methodology (ISO 12100-1:2003 + A1:2009) SIST EN 50223:2010
- 7 - EN 50223:2010 EN ISO 12100-2:2003 + A1:2009, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical principles (ISO 12100-2:2003 + A1:2009) EN ISO 13849-1, Safety of machinery - Safety-related parts of control systems - Part 1: General principles for design (ISO 13849-1) EN ISO 13850, Safety of machinery - Emergency stop - Principles for design (ISO 13850) EN ISO 14122-2; Safety of machinery - Permanent means of access to
machinery – Part 2: Working platforms and walkways (ISO 14122-2) EN ISO 14122-3; Safety of machinery - Permanent means of access to
machinery - Part 3: Stairs, stepladders and guard-rails (ISO 14122-3) EN ISO 14122-4; Safety of machinery - Permanent means of access to
machinery - Part 4: Fixed ladders (ISO 14122-4) EN ISO 20344:2004 + A1:2007, Personal protective equipment - Test methods for footwear; Amendment 1 (ISO 20344:2004 + A1:2007) ISO 8421-3:1989; Fire protection - Vocabulary – Part 3: fire detection and alarm 3 Definitions For the purposes of this document, the following terms and definitions apply.
3.1 stationary electrostatic application device for ignitable flock flock application booths or flock application areas, in which the electrostatic application equipment is either fixed stationary (e.g. on supports) and is operated automatically or is guided by reciprocators (e.g. robots). In general, the equipment comprises the following units: flock application booth; flock application area; flock application system; flock recovery system fixtures for workpieces; conveyors; grounding devices; forced ventilation; fire prevention and protection equipment; explosion protection equipment 3.2 flock application system devices for application of flock by means of electrostatic charge. In general, the flock application system comprises the following units: device for the transport of flock; high voltage electrode; high voltage supply system; dosing device 3.3 high voltage supply system in general, the high voltage supply system comprises the following: 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 switching device; high voltage cable; high voltage plug-and-socket connector SIST EN 50223:2010
EN 50223:2010 - 8 - 3.4 flock application area area, closed or not, in which the flock is applied to the workpieces by the electrostatic flock application system 3.5 flock application booth assembly of linked parts and devices like e.g.: forced ventilation by one or several fan(s); ducts of the forced ventilation; transport device for the flock; air filter and flock recovery system; measuring and control devices (e.g. interlocking of forced ventilation and flock application system); fire detection system and interlocking devices; explosion protection system; automatic cleaning system; air conditioning system; warning devices; and electrical apparatus joined together for application of flock within or at a partially or totally enclosed structure (limited by walls) for the controlled flock application 3.6 multi-zone flock application booth flock application booth including a number of sections for manual and/or automatic application of flock and forced ventilation flash off space 3.7 dangerous discharge a dangerous discharge is a discharge which generates the hazard of ignition of explosive mixtures or by electric shock 3.8 dosing device In general, the dosing device comprises the following parts: devices for dosing the flock; supply lines for the flock; devices for drive, control and monitoring the flock transport 3.9 flock recovery system the flock recovery system collects the overspray from the flock application process which has not been deposited on the workpiece, and, if necessary, recycles it. In general, the flock recovery system is either connected directly to the flock application booth or via the ducts of the forced ventilation 3.10 workpiece part, which is coated with an adhesive film and applied with flock 3.11 ignitable flock dispersed flock which could be ignited by an effective ignition source, and which continues to burn after removal of the ignition source or may react in the form of an explosion SIST EN 50223:2010
- 9 - EN 50223:2010 3.12 solvent liquid consisting of one or several components, volatile under specified drying/setting conditions, and in which the binder of the adhesive is soluble NOTE Solvents are also contained in liquids used as cleaning or washing agents. 3.13 hybrid mixture mixture of ignitable substances and air, occurring in different states of aggregation NOTE An example of a hybrid mixture is a mixture of solvent vapours of adhesives and flock in air. 3.14 explosive atmosphere mixture with air, under atmospheric conditions, of ignitable substances in the form of gases, vapours, mists, powder or flock in which combustion spreads to the entire unburned mixture after ignition has occurred 3.15 lower explosion limit (LEL) the concentration of ignitable gas, vapour, mist, powder or flock in air, below which an explosive atmosphere will not be generated 3.16 average concentration of ignitable flock in air mass of ignitable flock introduced into the flock application area, divided by the volume of air extracted by the forced ventilation system from the flock application area within the same period of time 3.17 hazardous areas areas where hazards due to explosive atmosphere may exist. The probability of occurrence of explosive atmosphere is classified in zones. Hazardous areas are given in Annex C 3.17.1 zone 0 area in which an explosive atmosphere consisting of a mixture with air of ignitable substances in the form of gas, vapour or mist is present continuously or for long periods or frequently NOTE In general, these conditions, when they occur, arise inside containers, ducts and apparatus, etc. 3.17.2 zone 1 area in which an explosive atmosphere consisting of a mixture with air of ignitable substances in the form of gas, vapour or mist is likely to occur occasionally during normal operation 3.17.3 zone 2 area in which an explosive atmosphere consisting of a mixture with air of ignitable substances in the form of gas, vapour or mist is not likely to occur during normal operation. If it does occur, it will persist for a short period
3.17.4 zone 20 area, in which an explosive atmosphere in the form of a cloud of combustible flock in air is present continuously, or for long periods or frequently NOTE In general, these conditions, when they occur, arise inside containers, ducts and apparatus, etc. 3.17.5 zone 21 area, in which an explosive atmosphere in the form of a cloud of combustible flock in air is likely to occur occasionally during normal operation NOTE This zone can include, among others, areas in the immediate vicinity of e.g. flock filling and delivery positions and places where flock layers occur and, during normal operation, may give rise to an explosive concentration of combustible flock in mixture with air. SIST EN 50223:2010
EN 50223:2010 - 10 - 3.17.6 zone 22 area in which an explosive atmosphere in the form of a cloud of combustible flock in air is not likely to occur during normal operation. If it does occur, it will persist for a short period NOTE This zone can include, among others, areas in the vicinity of equipment containing combustible flock, from which flock can escape from leaks and form flock deposits. 3.18 equipment category equipment for potentially explosive atmospheres is divided into groups and categories.
Group II: Equipment for areas with a potentially explosive atmosphere, other than mines susceptible to firedamp; this group comprises three categories depending to the level of safety provided 3.18.1 equipment group II category 1G equipment of this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists are present continuously or for long periods or frequently NOTE Equipment of category 1G is suitable for use in zones 0, 1 and 2. 3.18.2 equipment group II category 2G equipment of this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists are likely to occur NOTE Equipment of category 2G is suitable for use in zones 1 and 2. 3.18.3 equipment group II category 3G equipment of this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists are unlikely to occur, or, if they do occur, are likely to do so only infrequently and for a short period only NOTE Equipment of category 3G is suitable for use in zone 2. 3.18.4 equipment group II category 1D equipment of this category is intended for use in areas in which explosive atmospheres caused by flock/air mixtures are present continuously or for long periods or frequently NOTE Equipment of category 1D is suitable for use in zone 20, zone 21 and zone 22. 3.18.5 equipment group II category 2D equipment of this category is intended for use in areas in which explosive atmospheres caused by flock/air mixtures are likely to occur NOTE Equipment of category 2D is suitable for use in zone 21 and 22. 3.18.6 equipment group II category 3D equipment of this category is intended for use in areas in which explosive atmospheres caused by flock/air mixtures are unlikely to occur, or, if they do occur, are likely to do so only infrequently and only for a short period NOTE Equipment of category 3D is suitable for use in zone 22. 3.19 explosion relief protective measure by which an area of the wall panel of the enclosure (for example of the flock recovery system) is designed and constructed to release the excess pressure in the event of an explosion to prevent injury to persons and further damage to equipment 3.20 explosion suppression system which can detect and suppress an incipient explosion SIST EN 50223:2010
- 11 - EN 50223:2010 3.21 explosion decoupling system preventing the propagation of flames and explosions from one unit to other parts of the installation by special devices, e.g. mechanical high-speed shut-off, rotary valves or flame suppression barriers 3.22 discharge energy energy discharged from a conductive part of the installation in the form of a spark which could cause both electric shock to a person and an ignition of an explosive atmosphere 3.23 antistatic footwear footwear that has a resistance to ground, via the sole, which is low enough to prevent the build-up of electrostatic charges capable of an incentive discharge. See EN ISO 20344 NOTE A required electric insulating resistance to prevent electric shocks is not contradictory to this definition. 3.24 antistatic clothes clothes that have a resistance to ground, which is low enough to prevent the build-up of electrostatic charges capable of an incentive discharge. See EN 1149-5 NOTE A required electric insulating resistance to prevent electric shocks is not contradictory to this definition. 3.25 antistatic floor floor that has a resistance to ground, which is low enough to prevent the build-up of electrostatic charges capable of an incentive discharge 3.26 forced ventilation system ensures the air exchange by one or several fans or by other powered equipment NOTE Forced ventilation systems are using exhaust air units with devices for material separation and – optional – automatic cleaning, and in addition a supply air unit with devices for filtering, air conditioning and an automatic flock recovery system if applicable. 3.27 minimum air volume flow air volume flow of the forced ventilation which shall ensure to undercut the LEL under most unfavourable operating conditions and to prevent the emission of flock out of the flock application booth 3.28 recirculation air air, which is extracted from a volume and will be reintroduced into it 3.29 exposure limit values concentration limits of dangerous substances in the breathing air required by worker health legislation NOTE Limits may di
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