SIST EN 50348:2010
(Main)Stationary electrostatic application equipment for non-ignitable liquid coating material - Safety requirements
Stationary electrostatic application equipment for non-ignitable liquid coating material - Safety requirements
This European Standard specifies the requirements for stationary electrostatic application equipment for non-ignitable liquid coating materials which do not generate an explosive atmosphere inside the spraying area. 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 installations. This European Standard considers two types of electrostatic spraying systems, see 5.1 for more details. Noise has not been dealt with in this standard as it is not considered to be a significant hazard of stationary electrostatic application equipment for non-ignitable liquid coating material. For any other health protection, see EN 12215:2004, 5.5. For fire prevention and protection (e. g. fire hazards due to other sources), see also EN 12215:2004, 5.7.1. This European Standard deals with all significant hazards, hazardous situations and events, which are relevant for stationary electrostatic application equipment for non-ignitable liquid coating and cleaning materials which do not generate an explosive atmosphere inside the spraying area, provided they are used as intended by the manufacturer.
Stationäre Ausrüstung zum elektrostatischen Beschichten mit nichtentzündbaren flüssigen Beschichtungsstoffen - Sicherheitsanforderungen
Matériel fixe de projection électrostatique de produit à projeter liquide inflammable - Exigences de sécurité
1.1 La présente norme européenne spécifie les exigences relatives aux matériels fixes pour application électrostatique de matériaux liquides de revêtement ininflammables qui ne génèrent pas d'atmosphère explosive à l'intérieur de l'emplacement de projection. Il est fait une distinction entre les systèmes de projection couverts par la EN 50050 et les systèmes conçus pour des énergies et/ou des courants de décharge élevés.
La présente norme européenne spécifie aussi les exigences relatives à la conception pour une exploitation sûre des matériels fixes y compris les installations électriques.
1.2 La présente norme européenne traite de deux types de systèmes de projection électrostatique: voir 5.1 pour plus de détails.
1.3 Le bruit n’est pas couvert par la présente norme parce qu’il n’est pas considéré comme un risque significatif du matériel fixe pour projection électrostatique avec des produits de revêtement. Pour toute autre protection sanitaire, voir la EN 12215:2004, 5.5.
Pour la prévention et la protection contre le feu (par exemple risques de feu dus à d’autres sources), voir aussi la EN 12215:2004, 5.7.1.
La présente Norme Européenne traite de tous les risques significatifs et des situations et évènements dangereux qui concernent les matériels fixes pour application électrostatique de matériaux liquides de revêtement ininflammables ne générant pas d'atmosphère explosive à l'intérieur de l'emplacement de projection, sous réserve qu'ils soient utilisés comme prévu par le constructeur.
Vgrajena oprema za elektrostatični nanos nevnetljivih tekočin za prevleke - Varnostne zahteve
Ta evropski standard določa zahteve za vgrajeno opremo za elektrostatični nanos nevnetljivih tekočin za prevleke, ki v območju razprševanja ne ustvarjajo eksplozivne atmosfere. Razlikuje se med sistemi za pršenje, ki ustrezajo EN 50050, in sistemi za pršenje, ki so zasnovani za večje energije in/ali tokove sproščanja. Ta evropski standard določa tudi zahteve, povezane z zasnovo, za varno obratovanje vgrajene opreme, vključno z njenimi električnimi instalacijami. Ta evropski standard obravnava dve vrsti sistemov za elektrostatično pršenje, za več podrobnosti glej 5.1. Ta standard ne obravnava hrupa, saj ne velja za veliko nevarnost pri vgrajeni opremi za elektrostatični nanos nevnetljivih tekočin za prevleke. Za druge vrste varovanja zdravja glej EN 12215:2004, 5.5. Za preprečevanje in zaščito pred požarom (npr. nevarnost požara zaradi drugih izvorov) glej tudi EN 12215:2004, 5.7.1. Ta evropski standard obravnava vse velike nevarnosti, nevarne situacije in primere, ki se tičejo vgrajene opreme za elektrostatični nanos nevnetljivih tekočin za prevleke in čistil, ki v območju razprševanja ne ustvarjajo eksplozivne atmosfere, pod pogojem, da se uporabljajo po navodilih proizvajalca.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50348:2010
01-september-2010
1DGRPHãþD
SIST EN 50348:2002
9JUDMHQDRSUHPD]DHOHNWURVWDWLþQLQDQRVQHYQHWOMLYLKWHNRþLQ]DSUHYOHNH
9DUQRVWQH]DKWHYH
Stationary electrostatic application equipment for non-ignitable liquid coating material -
Safety requirements
Stationäre Ausrüstung zum elektrostatischen Beschichten mit nichtentzündbaren
flüssigen Beschichtungsstoffen - Sicherheitsanforderungen
Matériel fixe de projection électrostatique de produit à projeter liquide inflammable -
Exigences de sécurité
Ta slovenski standard je istoveten z: EN 50348:2010
ICS:
87.100 Oprema za nanašanje Paint coating equipment
premazov
SIST EN 50348:2010 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50348:2010
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SIST EN 50348:2010
EUROPEAN STANDARD
EN 50348
NORME EUROPÉENNE
February 2010
EUROPÄISCHE NORM
ICS 87.100 Supersedes EN 50348:2001
English version
Stationary electrostatic application equipment
for non-ignitable liquid coating material -
Safety requirements
Matériel fixe de projection électrostatique Stationäre Ausrüstung
de produit à projeter liquide inflammable - zum elektrostatischen Beschichten
Exigences de sécurité mit nichtentzündbaren flüssigen
Beschichtungsstoffen -
Sicherheitsanforderungen
This European Standard was approved by CENELEC on 2009-12-01. 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.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: 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 50348:2010 E
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Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 204, Safety of
electrostatic painting and finishing equipment.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50348 on
2009-12-01.
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.
This European Standard supersedes EN 50348:2001.
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) 2010-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-12-01
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 Directive 2006/42/EC. See Annex ZZ.
The State of the Art is included in Annex ZY “Significant changes between this European Standard and
EN 50348:2001”.
__________
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Contents
0 Introduction.4
0.1 Process .4
0.2 Fire 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 Requirements for spraying systems for non-ignitable liquid coating material .10
5.3 Spraying area.11
5.4 High voltage supply.11
5.5 Electric requirements .12
5.6 Grounding measures .12
5.7 Supply for coating material .12
6 Testing.13
6.1 Type tests of the high voltage cables .13
6.2 Type tests of the insulating spraying material supply hose .13
6.3 Routine tests of the stationary equipment .13
7 Information for use .15
7.1 General .15
7.2 Instruction manual.15
7.3 Marking .16
7.4 Warning sign .17
Annex A (informative) Ignitability of water-based paints .18
Annex ZY (informative) Significant changes between this European Standard and
EN 50348:2001 .20
Annex ZZ (informative) Coverage of Essential Requirements of EC Directive 2006/42/EC .21
Bibliography.22
Tables
Table 1 – Electrostatic spraying systems for non-ignitable coating material – Fields of
application .10
Table 2 – Requirements for electrostatic spraying systems for non-ignitable liquid coating
material.10
Table 3 – Survey of the tests.14
Table 4 – Test intervals .16
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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
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 grounded workpiece.
Droplets which are not applied to the workpiece (overspray) are removed by an extraction device or by
another device.
The coated workpieces are transported to dryer, where the solvent is evaporated and a dry film of coating
material is generated.
0.2 Fire hazards
0.2.1 Fire hazards can be caused by paint and varnish deposits inside the spray booth, exhaust air
ducts and filters. During operation, malfunctions or electrical faults may cause ignition of these residues.
This is especially true for spray booths where electrostatic coating takes place. The fast propagation of
the fire leads to hazards also in adjacent areas.
0.2.2 Particular attention shall be paid to the prevention of electrostatic charges on different surfaces,
which 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.
0.2.3 When spraying non-ignitable coating material, the formation of an explosive atmosphere is not
likely to occur. Electrostatic application equipment for ignitable liquid coating materials and hard to ignite
coating materials are covered by EN 50176.
0.3 Electric hazards
0.3.1 Electric shock (by direct or indirect contact) can be generated, for instance, by contact with
– live parts, which are not insulated for operational reasons,
– conductive parts, which are not under dangerous voltage during normal operation, but only in case of
failure,
– insulated live parts whose insulation is insufficient or has been damaged due to mechanical
influences.
0.3.2 Inadequate grounding may occur, for instance, due to
– faulty connections to the protective grounding system,
– a too high resistance to ground (requirement as in 5.6).
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 due to interferences of the
high voltage equipment and the components of the control and safety systems.
0.3.4 Hazardous electrostatic discharges could be generated, for instance, by non-grounded
conductive components or by large insulating surfaces, especially if they are backed with conductive
material.
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1 Scope
1.1 This European Standard specifies the requirements for stationary electrostatic application
equipment for non-ignitable liquid coating materials which do not generate an explosive atmosphere
inside the spraying area. 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 installations.
1.2 This European Standard considers two types of electrostatic spraying systems, see 5.1 for
more details.
1.3 Noise has not been dealt with in this standard as it is not considered to be a significant hazard
of stationary electrostatic application equipment for non-ignitable liquid coating material. For any other
health protection, see EN 12215:2004, 5.5. For fire prevention and protection (e. g. fire hazards due to
other sources), see also EN 12215:2004, 5.7.1.
This European Standard deals with all significant hazards, hazardous situations and events, which are
relevant for stationary electrostatic application equipment for non-ignitable liquid coating and cleaning
materials which do not generate an explosive atmosphere inside the spraying area, provided they are
used as intended by the manufacturer.
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 1081:1998, Resilient floor coverings - Determination of the electrical resistance
EN 1149-5, Protective clothing - Electrostatic properties - Part 5: Material performance and design
requirements
EN 12215:2004, Coating plants - Spray booths for application of organic liquid coating materials - Safety
requirements
EN 14462, Surface treatment equipment - Noise test code for surface treatment equipment including its
ancillary handling equipment - Accuracy grades 2 and 3
EN 50059:1990, Specification for electrostatic hand-held spraying equipment for non-flammable material
for painting and finishing
EN 50176, Automatic electrostatic spraying installations for flammable liquid spraying material
EN 60204-1:2006, Safety of machinery - Electrical equipment of machines - Part 1: General requirements
(IEC 60204-1:2005, mod.)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
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 61508-3; Functional safety of electrical/electronic/programmable electronic safety-related systems -
Part 3: Software requirements (IEC 61508-3)
EN 62061:2005, Safety of machinery - Functional safety of safety-related electrical, electronic and
programmable electronic control systems (IEC 62061:2005)
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EN ISO 11688-1:1998, Acoustics - Recommended practice for the design of low-noise machinery and
equipment - Part 1: Planning (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 12100-2:2003)
EN ISO 13849-1:2008, Safety of machinery - Safety-related parts of control systems - Part 1: General
principles for design (ISO 13849-1:2006)
EN ISO 20344:2004, Personal protective equipment - Test methods for footwear (ISO 20344:2004)
3 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
stationary electrostatic application equipment for non-ignitable liquid coating material
equipment in which the electrostatic spraying system 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:
– spray booth;
– spraying area;
– spraying system;
– fixtures for workpieces;
– conveyors;
– grounding system;
– forced ventilation
3.2
spraying system
devices for application of liquid coating material by means of electrostatic charge.
In general, the spraying system consists of the following components:
– device for the supply of coating material;
– high voltage electrode;
– high voltage supply system;
– spraying device
3.3
high voltage supply system
system consisting generally 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 switching device;
– high voltage cable;
– high voltage plug-and-socket connector
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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 a fire hazard and/or a hazard 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 the ignitability on the basis of the composition of the coating material is given in Annex A.
3.8
hard to ignite liquid coating materials
sprayed materials, especially varnishes, which could be ignited by an effective ignition source with an
energy of 2 J or above 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 the ignitability on the basis of the composition of the coating material is given in Annex A.
3.9
non-ignitable liquid coating materials
sprayed materials, especially varnishes, which could not be ignited by an effective ignition source with an
energy of 2 J or above
NOTE A formula for the estimation of the ignitability on the basis of the composition of the coating material is given in Annex A.
Liquids whose composition is outside the range of the formula, e.g. chlorinated liquids, have to be tested experimentally.
3.10
discharge energy
energy discharged from a conductive part of the installation in the form of a spark which could cause an
electric shock to a person
3.11
antistatic footwear
footwear that has a resistance to earth via the sole which is low enough to prevent the build-up of
electrostatic charges capable to produce a hazardous discharge
See EN ISO 20344:2004.
NOTE A necessary electric insulating resistance to prevent electric shocks is not contradictory to this definition.
3.12
antistatic clothes
clothes that have a resistance which is low enough to prevent the build-up of electrostatic charges
capable to produce a hazardous discharge
See EN 1149-5.
NOTE A necessary electric insulating resistance to prevent electric shocks is not contradictory to this definition.
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3.13
antistatic floor
floor that has a resistance to earth which is low enough to prevent the build-up of electrostatic charges
capable to produce a hazardous discharge
3.14
accessories
assemblies and other equipment, except of the spraying system and the high voltage supply system
3.15
constant-voltage operation
closed control circuit system with direct feedback of the actual value of the output high voltage. During the
constant-voltage operation, the adjusted output high voltage is maintained constant up to the capacity of
the high voltage part via a control device, independent of the variable operational current
NOTE In this standard, the symbol for this mode of operation is U .
k
3.16
voltage-controlled operation
open control circuit system without feedback of the output high voltage. During the voltage-controlled
operation the output high voltage is adjusted generally at a defined operational current. The output high
voltage, however, is not maintained constant by a control device, it varies depending on the operational
current and the on-load behavior of the high voltage device
NOTE In this standard, the symbol for this mode of operation is U .
v
3.17
constant-current operation
closed control circuit system with direct feedback of the actual value of the high voltage current to a
control device. In doing so, the operational current is maintained constant and the output high voltage
varies load-dependently between a minimum and a maximum value defined by the process
NOTE In this standard, the symbol for this mode of operation is I .
k
3.18
operational current
current that flows within the high voltage circuit during failure-free operation
NOTE In this standard, the symbol for the operational current is I .
b
3.19
overcurrent
current occurring during a malfunction, exceeding the operational current of the high voltage circuit and
giving rise to expect that in voltage-controlled and constant-voltage operation hazardous discharges or
arcs between high voltage parts and grounded parts of the plant can occur in case the safety distance
drops below the permissible limit
NOTE In this standard, the symbol for overcurrent in the high voltage circuit is I .
u
3.20
minimum voltage
value of the voltage of the high voltage circuit giving rise to expect that in constant-current operation
hazardous discharges or flashover by arcs can occur between high voltage parts and grounded parts of
the plant in case the safety distance drops below the permissible limit
NOTE In this standard, the symbol for minimum voltage in the high voltage circuit is U
min.
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3.21
disconnection threshold
disconnection threshold is either the overcurrent value I or the minimum voltage value U . When the
u min
value of I is exceeded or the value of U falls below, a cutting off of the high voltage supply is released
u min
3.22
skilled person
person who due to technical training, experience and recent occupational activities has sufficient
knowledge in the field of electrostatic coating with stationary equipment, is familiar with the relevant and
generally accepted technical rules, and thus is able to test and evaluate the safe state of coating plants
3.23
repeated inspection
inspection of the entire electrical equipment, systems and plants to be carried out at regular intervals
4 General requirements
4.1 If spray booths are used, they shall comply with the requirements of EN 12215:2004, except for
requirements related to explosion protection.
4.2 Special requirements for the spraying area are specified in 5.3.
4.3 An appropriate grounding of the different surfaces shall be provided. Special care shall be taken
that sufficient grounding is maintained by the hangers. The hangers shall be designed in such a way that
deposits of coating material are minimised.
4.4 Stationary equipment shall be designed and constructed to satisfy the intended function as
given by the limitations of the manufacturer safely even in case of varying environmental conditions,
influence of external voltages, exposure to humidity, vibrations, contaminations as well as other
environmental influences. Stationary equipment shall be suitable for the intended mechanical and thermal
demands and shall withstand the effects of present or predictable aggressive materials.
4.5 The spraying system, with exception of the spraying device, shall have at least IP-protection
IP54 protection according to IEC 60529.
4.6 Safety devices shall function independently of the measuring, control and regulation devices
required for operation. The failure of a safety device shall be detected, if possible, by appropriate
technical measures within an adequate period, so that hazardous conditions are not likely to occur.
Fundamentally, the fail-safe principle shall be applied.
In case of failure of safety devices, the stationary equipment shall be led to a safe condition as far as
possible.
4.7 The entire control system consisting of e.g. electrical control, monitoring and measurement
systems, which are used in safety related functions, shall comply with the safety integrity level 2
according to EN 62061:2005 or fulfil the requirements of performance level (PL) d of EN ISO 13849-
1:2008.
If safety functions of the control system according to Clause 5 and Table 2 depend on software, particular
attention shall be paid to risks due to programme errors, see EN 61508-3 and EN 62061:2005, 6.10, 6.11
and Annex C.
4.8 The equipment shall comply with the safety requirements and/or protective measures of this clause.
In addition, the equipment shall be designed according to the principles of EN ISO 12100 for relevant, but
not significant hazards, which are not dealt with by this standard.
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5 Requirements for the equipment
5.1 Electrostatic spraying systems
Depending on the discharge energy that can be transmitted, electrostatic spraying systems are
categorised into two types according to Table 1.
Table 1 – Electrostatic spraying systems for non-ignitable coating material –
Fields of application
Types Discharge energy Hazard by electric
shock
("NL" for liquid non-
ignitable coating material)
Type A-NL < 350 mJ No
Type B-NL > 350 mJ Yes
2
NOTE The discharge energy W can be calculated by the formula W = ½ C U . If resistors, semi-conductors or liquid conductors
are present, the calculation of W results in too high values. Alternatively the discharge energy can be determined by measurement.
5.2 Requirements for spraying systems for non-ignitable liquid coating material
The requirements related to the different types are listed in Table 2.
Table 2 – Requirements for electrostatic spraying systems for non-ignitable liquid coating
material
Subclause Requirements Type A-NL Type B-NL
5.2.1 Design to EN 50059:1990 Yes No
5.2.2 Disconnection of high voltage No Yes
5.2.3 Personal protection No Yes
5.4.2 Protection against contact No Yes
5.2.1 Design to EN 50059:1990
Spraying systems shall comply with the requirements of EN 50059:1990.
5.2.2 Safe disconnection of high voltage
A device shall be installed which prevents the occurrence of hazardous discharges between parts under
high voltage and grounded parts in such a way that it disconnects the high voltage, discharges the
spraying system and shuts down the supply of coating material. In this context, a difference shall be
made between voltage controlled, constant-voltage and constant-current operating modes.
5.2.2.1 Voltage-controlled and constant-voltage operating mode
A device shall be installed, which is to disconnect the high voltage in case the safety distance between
the parts under high voltage and grounded parts drops below the permissible limit.
For voltage-controlled and constant-voltage operating mode this is achieved by a disconnection in case
of overcurrent I .
u
The disconnection threshold shall be defined with consideration of the operational and local conditions.
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NOTE Typically an overcurrent I , for operational currents of less than 200 µA up to 200 % or for operational currents of more
u
than 200 µA up to 50 % is permissible.
5.2.2.2 Constant-current operating mode
A device shall be installed which is to disconnect the high voltage in case the safety distance between
parts under high voltage and grounded parts drops below the permissible limit.
For constant-current operating mode, this is achieved by disconnection, if a defined minimum output
value of high voltage U is undercut.
min
The disconnection threshold shall be defined with consideration of the operational and local conditions.
NOTE Typically a value of the minimum voltage U of 20 % to 50 % below the value of the output high voltage for the failure-
min
free normal operation is permitted.
5.2.3 Protection against too high discharge energy
After disconnection of the high voltage all live parts shall be discharged to a discharge energy of less
than 350 mJ before these parts can be reached. The discharge time shall be defined considering the
operational and local conditions.
5.3 Spraying area
5.3.1 The forced ventilation of the spraying area shall satisfy the requirements of EN 12215:2004.
5.3.2 When using walls, enclosures, signs and labels made of non-conductive material, the
occurrence of propagating brush discharges shall be prevented. Thin sheets of plastic material less than
9 mm thick in contact with large areas of grounded metal (or other conductors) can give rise to
propagating brush discharges. Where such thin sheets are used, the breakdown voltage through the
sheet shall not exceed 4 kV to avoid the occurrence of pro
...
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