SIST EN 50050-3:2014

Electrostatic hand-held spraying equipment - Safety requirements - Part 3: Hand-held spraying equipment for ignitable flock

This European Standard specifies the requirements for hand-held or hand-operated electrostatic spraying equipment for ignitable flock within a temperature range from 5 °C to 40 °C to be used in explosive atmospheres generated by their own spray cloud. This European Standard deals with all electrical hazards significant for the electrostatic spraying of flock, which could also contain small quantities of added metal particles, if the work is carried out under conditions recommended by the manufacturer. In particular, this includes ignition hazards resulting from the generated explosive atmosphere. This European Standard specifies the design-related and test requirements for electrostatic spraying equipment of type A-F and type B-F according to Table 1 of EN 50223:2010. Electrostatic applicators are considered to be equipment of group II, category 3D for use in potentially explosive areas of zone 22. All other parts of hand-held electrostatic spraying equipment are considered to be equipment of category 3D if they are installed or used in potentially explosive areas of zone 22.

Elektrostatische Handsprüheinrichtungen - Sicherheitsanforderungen - Teil 3: Handsprüheinrichtungen für entzündbaren Flock

Equipement manuel de projection électrostatique - Exigences de sécurité - Partie 3: Equipement manuel de projection de floque inflammable

1.1   La présente Norme Européenne spécifie les exigences relatives aux matériels portatifs de projection électrostatique ou aux matériels actionnés manuellement pour flock inflammable dans une plage de températures de 5 °C à 40 °C utilisées en atmosphères explosives, celles-ci étant générées par leur propre nuage de projection.  La présente Norme Européenne traite de tous les dangers électriques importants concernant la projection électrostatique de flock, susceptible de contenir également de faibles quantités de particules métalliques additionnelles, si les travaux sont menés à bien dans des conditions recommandées par le fabricant. En particulier, ceci inclut les risques d'inflammation résultant de l'atmosphère explosive ainsi produite. La présente Norme Européenne spécifie les exigences relatives à la conception et aux essais des matériels de projection électrostatique de type A-F et de type B-F, conformément au Tableau 1 de la EN 50223:2010.   1.2    Les applicateurs électrostatiques sont considérés comme des matériels de groupe II, catégorie 3D pour une utilisation dans des emplacements potentiellement explosifs de la zone 22. Toutes les autres parties des matériels manuels de projection électrostatique sont considérées comme des matériels de catégorie 3D, si elles sont installées ou utilisées dans des emplacements potentiellement explosifs de la zone 22. NOTE 1   Les vapeurs de solvants susceptibles d'être évaporées par la pièce à traiter revêtue d'adhésifs ne conduisent pas à une zone 2 dans la zone de floculation. 1.3    En plus des exigences ci-dessus, les exigences de la EN 1953 s'appliquent pour ce qui concerne tous les autres phénomènes dangereux importants appropriés aux applicateurs (par exemple, risques pour la santé, inadéquation ergonomique). 1.4    La présente Norme Européenne n’est pas applicable    à la classification en zones des emplacements à l’intérieur et autour des cabines de pulvérisation [voir la EN 50223],    à la classification en zones d'autres emplacements comportant une atmosphère potentiellement explosive [voir la EN 60079-10-2],    au choix, au montage et à l'utilisation d'autres matériels électriques et non électriques dans les emplacements comportant un danger d'explosion [voir la EN 60079-14 et la EN 50223],    au nettoyage des emplacements de projection, voir le manuel d'instructions du matériel de projection,    à la prévention de l'incendie et à la protection contre l'incendie. Par exemple: les dangers d'incendie dus à d'autres sources [voir EN 50223],    aux systèmes de protection contre l'explosion [voir la EN 50223],    aux phénomènes dangereux relatifs aux poussières [voir la EN 12981]. NOTE 2   Le bruit n'est pas considéré comme un phénomène dangereux significatif pour les matériels manuels de projection pour le flock inflammable.

Oprema za ročno elektrostatično brizganje - Varnostne zahteve - 3. del: Ročna oprema za brizganje vnetljivih kosmičev

Ta evropski standard določa zahteve za ročno opremo za elektrostatično brizganje vnetljivih kosmičev v temperaturnem območju od 5 °C do 40 °C, ki se uporablja v eksplozivnih atmosferah, ki jih ustvari njihov lastni oblak prahu. Ta evropski standard zajema vse električne nevarnosti, ki se pojavijo pri elektrostatičnem brizganju kosmičev, ki lahko vsebujejo tudi manjše količine dodanih kovinskih delcev, če je delo opravljeno pod pogoji, ki jih priporoča proizvajalec. To zajema zlasti nevarnost vžiga zaradi ustvarjene eksplozivne atmosfere. Ta evropski standard določa zahteve, povezane z zasnovo in preskušanjem, za elektrostatično opremo za brizganje vrste A–F in B–F v skladu s tabelo 1 standarda EN 50223:2010. Elektrostatične naprave za nanašanje sodijo v skupino II, kategorijo 3D za uporabo v potencialno eksplozivnih okoljih cone 22. Vsi ostali deli ročne opreme za elektrostatično brizganje sodijo v kategorijo 3D, če so nameščeni in se uporabljajo v potencialno eksplozivnih območjih cone 22.

General Information

• Status: Published
• Public Enquiry End Date: 27-Oct-2011
• Publication Date: 18-Mar-2014
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• ICS: 87.100 - Paint coating equipment
• Technical Committee: EXP - Electrical apparatus for explosive atmospheres
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Dec-2013
• Due Date: 21-Feb-2014
• Completion Date: 19-Mar-2014
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Directive: 94/9/EC - Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: EN 50050-3:2013 - Electrostatic hand-held spraying equipment - Safety requirements - Part 3: Hand-held spraying equipment for ignitable flock

Relations

• Revised: SIST EN 50050:2007 - Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
• Effective Date: 23-Jul-2014
• Replaces: SIST EN 50050:2007 - Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
• Effective Date: 28-Jan-2023
• Revised: SIST EN 50050:2007 - Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50050-3:2014
01-maj-2014
2SUHPD]DURþQRHOHNWURVWDWLþQREUL]JDQMH9DUQRVWQH]DKWHYHGHO5RþQD
RSUHPD]DEUL]JDQMHYQHWOMLYLKNRVPLþHY
Electrostatic hand-held spraying equipment - Safety requirements - Part 3: Hand-held
spraying equipment for ignitable flock
Elektrostatische Handsprüheinrichtungen - Sicherheitsanforderungen - Teil 3:
Handsprüheinrichtungen für entzündbaren Flock
Equipement manuel de projection électrostatique - Exigences de sécurité - Partie 3:
Equipement manuel de projection de floque inflammable
Ta slovenski standard je istoveten z: EN 50050-3:2013
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
87.100 Oprema za nanašanje Paint coating equipment
premazov
SIST EN 50050-3:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50050-3:2014

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SIST EN 50050-3:2014

EUROPEAN STANDARD
EN 50050-3

NORME EUROPÉENNE
November 2013
EUROPÄISCHE NORM

ICS 87.100 Supersedes EN 50050:2006 (partially)


English version


Electrostatic hand-held spraying equipment -
Safety requirements -
Part 3: Hand-held spraying equipment for ignitable flock



Equipement manuel de projection Elektrostatische Handsprüheinrichtungen -
électrostatique - Sicherheitsanforderungen -
Exigences de sécurité - Teil 3: Handsprüheinrichtungen für
Partie 3: Equipement manuel de entzündbaren Flock
projection de floque inflammable






This European Standard was approved by CENELEC on 2013-10-14. 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre 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, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50050-3:2013 E

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EN 50050-3:2013 - 2 -

Contents
Page
Foreword . 3
0 Introduction . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements for hand-held spraying equipment for ignitable flock . 10
4.1 General requirements . 10
4.2 Requirements for the accessories . 11
5 Tests . 12
5.1 General . 12
5.2 General tests . 12
5.3 Conditioning test . 12
5.4 Tests for electrical safety . 13
5.5 Test of the maximum discharge energy and the maximum transferred charge . 14
5.6 Tests of the accessories . 14
6 Information for use . 14
6.1 General . 14
6.2 Instruction manual. 14
6.3 Marking of electrostatic hand-held spraying equipment and associated control
devices . 16
Annex A (normative) Test for ignition protection using a shunt and an oscilloscope . 19
Annex B (informative) Quality assurance systems for electrostatic spraying equipment . 20
B.1 General . 20
B.2 Electrical assembly . 20
B.3 Mechanical assembly . 21
B.4 Tests . 21
Annex ZY (informative) Significant changes between this European Standard and
EN 50050:2006 . 22
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives . 23

Bibliography . 24
Tables
Table 1 — Test intervals. 16

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Foreword
This document (EN 50050-3:2013) has been prepared by SC 31-8, "Electrostatic painting and finishing
equipment", of CLC/TC 31, "Electrical apparatus for potentially explosive atmospheres".

The following dates are fixed:

(dop) 2014-10-14
• latest date by which this document has to be
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2016-10-14
conflicting with this document have to
be withdrawn

In combination with EN 50050-1:2013 and EN 50050-2:2013, this document supersedes
EN 50050:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.

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0 Introduction
0.1 Process
In the process of electrostatic flock application, flock particles are transported from a reservoir to an
applicator either by gravitational forces or within an air stream. As the flock particles are passing the
applicator, they are electrostatically charged and developed by means of a high voltage of some tens
of kilovolts and ejected in the form of a cloud which is directed towards the workpiece. The flock
particles of the cloud are attracted by the earthed workpiece and enclosed from a before served
adhesive layer. They stick in this adhesive layer until the adhesive is set at room temperature or by
heating.
Flock particles not deposited on the workpiece (overspray) are removed by the exhaust ventilation
system, by brushes or other devices into the flock recovery system.
0.2 Explosion hazards
0.2.1 An explosion can occur, if
 the concentration of flock particles in air is within the explosion limits,
 contamination by adhesives (in a cured condition most of the adhesives are insulating), and
 an ignition source of appropriate energy for this explosive atmosphere
is present.
Ignition sources could be, for instance, a hot surface, a naked flame, an electric arc or a spark.
An explosion could be prevented, if at least one condition is avoided. Because it is very difficult to
exclude the possibility of ignitable discharges completely, the main focus should be the prevention of
ignitable concentrations of flock in air.
0.2.2 Deflagration of explosive atmospheres is only possible within a given range of concentration,
but not, if the concentration is above or below this range.
NOTE If an explosive cloud of flock and air is trapped into a closed room, an explosion can lead to a fatal
increase of pressure.
0.2.3 It is important that deposits of flock are not allowed to accumulate within the spraying areas
for they may be whirled up and give rise to an explosive atmosphere. This does not apply to deposits
on filter devices and accumulations of flock in reservoirs where filters and reservoirs are integrated in
the spraying area and are designed to collect the flock.
0.2.4 Particular attention should be paid to the prevention of electrostatic charges on different
surfaces located in the vicinity of the flock cloud. This could apply to e.g. workpieces during the
coating process.
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 connected to dangerous voltage during normal operation, but only
in case of failure,
– insulated live parts with insufficient or damaged insulation due to external impact.
0.3.2 Inadequate earthing may occur, for instance, due to
– faulty connections to the protective earthing system,
– a too high resistance to earth (e. g. contamination by flock).

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0.3.3 Hazards could occur, for instance, if hazardous malfunctions (e.g. shortcut of electronic
safety circuits) 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-earthed
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 hand-held or hand-operated electrostatic
spraying equipment for ignitable flock within a temperature range from 5 °C to 40 °C to be used in
explosive atmospheres generated by their own spray cloud.
This European Standard deals with all electrical hazards significant for the electrostatic spraying of
flock, which could also contain small quantities of added metal particles, if the work is carried out
under conditions recommended by the manufacturer. In particular, this includes ignition hazards
resulting from the generated explosive atmosphere. This European Standard specifies the design-
related and test requirements for electrostatic spraying equipment of type A-F and type B-F according
to Table 1 of EN 50223:2010.

1.2 Electrostatic applicators are considered to be equipment of group II, category 3D for use in
potentially explosive areas of zone 22. All other parts of hand-held electrostatic spraying equipment
are considered to be equipment of category 3D if they are installed or used in potentially explosive
areas of zone 22.
NOTE 1 Solvent vapours which could be evaporated by workpieces coated with adhesives do not lead to a
zone 2 in the flocking area.
1.3 In addition to the requirements above, the requirements of EN 1953 applies with regard to all
other significant hazards relevant for applicators (e.g. health hazards, inadequate ergonomics).
1.4 This European Standard does not apply to
 zone classification of the areas in and around spray booths [see EN 50223],
 zone classification of other areas with potentially explosive atmosphere [see EN 60079-10-2],
 selection, erection and application of other electrical and non-electrical equipment in areas with
explosion hazard [see EN 60079-14 and EN 50223],
 cleaning of spraying areas, see instruction manual of the spray booth,
 fire prevention and protection, for instance fire hazards due to other sources [see EN 50223],
 explosion protection systems [see EN 50223],
 dust hazards [see EN 12981].
NOTE 2 Noise is not considered to be a significant hazard for hand-held spraying equipment for ignitable flock.

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2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

EN 1953 Atomising and spraying equipment for coating materials –
Safety requirements
EN 1149-5 Protective clothing – Electrostatic properties – Part 5: Performance
requirements
EN 12981 Coating plants – Spray booths for application of organic powder
coating material – Safety requirements
EN 50223:2010 Stationary electrostatic application equipment for ignitable flock
material – Safety requirements
EN 60079-7:2007 Explosive atmospheres – Part 7: Equipment protection by
increased safety "e" (IEC 60079-7:2006)
EN 60204-1 Safety of machinery – Electrical equipment of machines –
Part 1: General requirements (IEC 60204-1)
EN 60529 Degrees of protection provided by enclosures (IP code) (IEC 60529)
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 machinery – Functional safety of safety-related electrical,
electronic and programmable electronic control systems
(IEC 62061)
EN ISO 12100 Safety of machinery - General principles for design - Risk
assessment and risk reduction (ISO 12100)
EN ISO 13849-1 Safety of machinery - Safety-related parts of control systems -
Part 1: General principles for design (ISO 13849-1)
EN ISO 20344 Personal protective equipment – Test methods for footwear
(ISO 20344)

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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
hand-held spraying equipment
hand-held or hand-operated equipment for electrostatic coating using ignitable flock, generally
comprising the following parts:
 applicator;
 flock supply system;
 control device;
 high voltage supply system;
 connecting cable
3.2
connecting cable
electric cable to the applicator
3.3
earthing device
device for earthing the hand-held spraying equipment permanently
3.4
spraying device
outlet opening for the flock
3.5
high voltage electrode
conductive part of the applicator which is at high voltage and serves to charge the coating material
directly or indirectly
3.6
control device
device generally having the following functions:
 control of, for instance, the flock supply system, the control air, the purge air
Note 1 to entry A combination of the control device and the high voltage supply according to 3.8 is possible.
3.7
applicator
equipment for application of flock
Note 1 to entry In general, the applicator comprises the following parts:
- high voltage electrode;
- high voltage supply (as far as integrated into the applicator);
- housing;
- spraying device;
- exchangeable attachment parts (e.g. nozzles, extensions, angular pieces, etc.);
- if applicable, battery unit (integrated fixedly, or attached).

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3.8
high voltage supply for applicators
in general, high voltage supply comprising the following parts:
 low voltage section with devices for switching on and off the hand-held spraying equipment and for
adjustment, control, regulation, limitation and monitoring of current and voltage, as well as the
required connecting cables;
 high voltage generator
3.9
spraying area
area, closed or not, in which the flock is applied to the workpiece by the hand-held spraying equipment
3.10
dangerous discharge
discharge which generates the hazard of ignition of explosive mixtures or of electric shock
3.11
flock supply system
in general, flock supply system comprising the following:
 flock reservoir;
 dosing devices for flock;
 supply lines for flock;
 devices for drive, control and monitoring flock supply system
3.12
workpiece
article to which the flock is applied
3.13
ignitable flock
flock which, in a whirled-up state, could be ignited by an effective ignition source and which continues
to burn after the ignition source has been removed or may react in the form of an explosion
3.14
explosive atmosphere
mixture of air, under atmospheric conditions, and of ignitable substances in the form of gas, vapour,
mist, powder or flock, in such proportions that it can be ignited by effective ignition sources, such as
excessive temperature, arcs or sparks [EN 1127-1]
3.15
Lower Explosion Limit
LEL
concentration of ignitable gas, vapour, mist, powder or flock in air below which an explosive
atmosphere will not be formed
3.16
discharge energy
energy discharged from a conductive part of the installation in form of a spark which could cause both
electric shock to a person and an ignition of an explosive atmosphere
3.17
antistatic footwear
footwear that has a resistance to earth via its sole, which is low enough to prevent the build-up of
electrostatic charges capable to produce a dangerous discharge
Note 1 to entry See EN ISO 20344.
Note 2 to entry A required electric insulating resistance to prevent electric shocks is not contradictory to this
definition.

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3.18
antistatic clothes
clothes that have a resistance to earth, which is low enough to prevent the build-up of electrostatic
charges capable of a dangerous discharge
Note 1 to entry See EN 1149-5.
Note 2 to entry A required electric insulating resistance to prevent electric shocks is not contradictory to this
definition.
3.19
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 dangerous discharge
3.20
accessories
devices, components and other equipment, except for 3.7 of this standard
3.21
U
max
maximum output voltage of the high-voltage generator
3.22
I
max
maximum output current of the high-voltage generator
3.23
repeated test
test of the hand-held spraying equipment, including all accessories, to be carried out at regular
intervals
3.24
contact surface area
part of the handle connected to earth to discharge the charge of a person
4 Requirements for hand-held spraying equipment for ignitable flock
4.1 General requirements
4.1.1 Hand-held spraying equipment shall be designed and constructed to prevent exceeding of a
maximum discharge energy of 350 mJ for electrical systems (live conductive components, e.g. cables,
high voltage electrode) and exceeding of a maximum transferred charge of individual sparks of 50 µC
for electrostatic systems (charged plastic surfaces, e.g. insulating hoses, insulating enclosures).
4.1.2 All conductive parts of the hand-held spraying equipment which are not at high voltage
potential shall be earthed. Earthing of conductive parts inside the hand-held spraying equipment can
be neglected if hazardous discharges have been prevented by design. Conductive parts connected to
measuring and control circuits shall be earthed with a resistance of ≤ 100 MΩ. Parts which are at high
voltage for operational reasons shall be bonded to each other in a conductive way.
4.1.3 Applicators shall meet the applicable requirements of EN 1953.
4.1.4 Electrical connecting cables shall be connected to the applicator or associated equipment in a
secured way. Requirements of 5.3.1 shall be fulfilled.
4.1.5 The handle of the applicator shall have a contact surface area of conductive material of at
least 20 cm². This contact surface area shall be earthed, and the resistance to earth shall not exceed
1 MΩ.
4.1.6 Operating triggers of applicators shall be dissipative and shall automatically take the
OFF-position. In this position, the flock supply system shall be cut-off immediately, and the high
voltage supply shall be cut-off within 2 s. For high voltage supplies having several outputs, the cut-off
function shall be ensured for each output/applicator individually.

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4.1.7 Applicators shall have an earth connection. The resistance to earth shall not exceed 1 MΩ.
The connection shall be designed in accordance with 4.2.1 of EN 60079-7:2007.
4.1.8 Components on which ignition safety depends shall be designed, arranged and built in to not
impair the safety of the electrostatic hand-held spraying equipment. Examples of components on
which ignition safety depends are spray nozzles, cables of the earthing system, resistances and other
electronic components.
Insulating materials of parts under high-voltage shall be constructed according to the operation,
transport and storage conditions.
4.1.9 The electric equipment not connected to the high voltage system shall comply with
EN 60204-1.
4.1.10 If energy limiting electric components (e.g. resistors) are used, they shall be designed in such
a way that they are protected against damage. All components shall withstand a short circuit between
the high voltage electrode and earth for 5 min. The degree of protection shall remain unchanged.
4.1.11 All electrical components of the applicator, other than the spraying device shall be constructed
at least comparable with IP54 of EN 60529. As an alternative, the applicator, except for the spraying
device, can be designed according to IP54 according to EN 60529.
4.1.12 Electrical cables connected to the applicator shall have an earthed shielding which is
protected against mechanical damage (e.g. by insulation).
4.1.13 It shall be ensured that the limit values for maximum discharge energy and maximum
transferred charge defined in 4.1.1 are observed under any operating conditions. Faults of the high
voltage supply for applicators shall be considered. This safety function (monitoring function) shall meet
the requirements of SIL 2 (e.g. according to EN 62061) or PL d (e.g. according to EN ISO 13849-1).
Alternatively, this safety level will be reached if the values for outlet current and outlet voltage
according to 5.4.1 will be limited by two Zener diodes or equivalent parts (e.g. power semiconductors)
loaded up to two-thirds in the case of failure.
In general, the fail-safe principle shall be applied.
In case of failure of the safety functions the hand-held spraying equipment shall be led in a safe state.
If the safety related functions of the hand-held spraying equipment depend on software, hazards due
to program errors shall be considered in particular.
4.2 Requirements for the accessories
4.2.1 Accessories that are used in hazardous areas, as applicable, shall be submitted to a cable
pull test according 5.3.1. Non-metallic accessory that is used in hazardous areas shall be submitted to
an impact resistance test according to 5.3.2. Accessories that are used in hazardous areas shall
comply with the minimum degree of protection IP54 according to EN 60529 and may not exceed the
maximum allowed surface temperature. Accessories that are used in hazardous areas shall be
designed and constructed to prevent exceeding the maximum transferred charge of single sparks of
50 µC, or the maximum discharge energy of 350 mJ.
4.2.2 Control devices and the flock supply system shall have an earth connection. The resistance to
earth shall not exceed 1 MΩ. The connection shall be designed in accordance with 4.2.1 of
EN 60079-7:2007.
4.2.3 The operating parameters relevant for safety, operational voltage, operational current and
short circuit current, shall not be set to values deviating from the checked limit values defined in
5.3.1.1 to 5.3.1.3.
4.2.4 Detachable earth connections shall be marked clearly.

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EN 50050-3:2013 - 12 -
4.2.5 All parts of the flock material supply system in particular hoses made of non-conducting
material shall be designed and constructed in such a way that they cannot be the source of discharges
having a transferred charge of more than 50 µC.
5 Tests
5.1 General
All tests described in 5.2, 5.3, 5.4 and 5.5 shall be carried out with two applicators according to the
following order: cable pull test, impact test, drop test, test of electrical safety and ignition tests.
All tests described in 5.2, 5.3, 5.4 and 5.5 shall be carried out with cleaned applicators.
The value of the output high voltage and output current shall be set to the maximum value during the
tests according to 5.4.1.1 to 5.4.1.3 and 5.5. The manufacturer shall indicate the required relevant
operational parameters (e.g. supply voltage).
Tests described in 5.4 and 5.5 shall be carried out by a temperature of (22 ± 5) °C, except for those in
which the upper or lower limit value of the operating temperature is assumed to be the more
unfavourable for passing the test.
5.2 General tests
5.2.1 Test of earth connections
It shall be tested that the hand-held spraying equipment has an earth connection complying with 4.1.5,
4.1.7 and 4.2.2.
5.2.2 Resistance to earth test
The resistance shall be measured using a measuring device at a measurement voltage from 500 V to
1 000 V, see 4.1.2, 4.1.5, 4.1.7 and 4.2.2.
5.2.3 Test of contact surface area
The size of the contact surface area shall be proven by measurement (e. g. tape measure), see 4.1.5.
5.2.4 Test of OFF-position
The function of the OFF-position shall be proven by measurement, see 4.1.5.
5.3 Conditioning test
5.3.1 Cable pull test
Each cable of the applicator, except for cables connecting intrinsically safe circuits among each other,
shall be submitted to a cable pull test with 150 N for 60 s.
During the test, the test sample shall not show visible movements of the cable in its fixture.
5.3.2 Impact test
The test shall be carried out on two applicators which are ready for operation, one test without and
one with attachment parts (e.g. extensions, angular pieces, battery unit, etc.), as well as on the
accessories which has to be located within the potentially hazardous area. The test shall be carried
out once at four different positions. The impact points shall be those points which are considered to be
the weakest ones, and they shall be located on the outer side of those parts which may be exposed to
impacts.
The test samples shall be exposed to a test mass of 1 kg falling perpendicularly from a height of
0,7 m. The test mass shall be equipped with a hemispherical impact load of at least 25 mm in

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SIST EN 50050-3:201
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