SIST EN 50050-1:2014

SLOVENSKI STANDARD
SIST EN 50050-1:2014
01-junij-2014
1DGRPHãþD
SIST EN 50050:2007
2SUHPD]DURþQRHOHNWURVWDWLþQREUL]JDQMH9DUQRVWQH]DKWHYHGHO5RþQD
RSUHPD]DEUL]JDQMHYQHWOMLYLKWHNRþLKSUHNULYQLKVQRYL
Electrostatic hand-held spraying equipment - Safety requirements - Part 1: Hand-held
spraying equipment for ignitable liquid coating materials
Elektrostatische Handsprüheinrichtungen - Sicherheitsanforderungen - Teil 1:
Handsprüheinrichtungen für entzündbare flüssige Beschichtungsstoffe
Electrostatic hand-held spraying equipment - Safety requirements - Part 1: Hand-held
spraying equipment for ignitable liquid coating materials
Ta slovenski standard je istoveten z: EN 50050-1:2013
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 50050-1:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50050-1:2014

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SIST EN 50050-1:2014

EUROPEAN STANDARD
EN 50050-1

NORME EUROPÉENNE
November 2013
EUROPÄISCHE NORM

ICS 87.100 Supersedes EN 50050:2006 (partially)


English version


Electrostatic hand-held spraying equipment -
Safety requirements -
Part 1: Hand-held spraying equipment for ignitable liquid coating
materials



Equipement manuel de projection Elektrostatische Handsprüheinrichtungen -
électrostatique - Exigences de sécurité - Sicherheitsanforderungen -
Partie 1 : Equipement manuel de Teil 1: Handsprüheinrichtungen für
projection de liquides de revêtement entzündbare flüssige Beschichtungsstoffe
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 50050-1:2013 E

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Contents
Page
Foreword . 3
0 Introduction . 5
0.1 Process . 5
0.2 Explosion hazards . 5
0.3 Electric hazards . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements for hand-held spraying equipment for ignitable liquid coating materials . 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 . 13
5.4 Tests for electrical safety . 13
5.5 Ignition test . 14
5.6 Tests of the accessories . 14
6 Information for use . 15
6.1 General . 15
6.2 Instruction manual. 15
6.3 Marking of electrostatic hand-held spraying equipment and associated control devices . 17
Annex A (normative) Test for ignition protection using a shunt and an oscilloscope . 20
Annex B (normative) Ignition test within the gas mixture . 21
B.1 General . 21
B.2 Preparations . 21
B.3 Preliminary test . 21
B.4 Test. 22
B.5 Result . 22
Annex C (informative) Quality assurance systems for electrostatic spraying equipment . 23
C.1 General . 23
C.2 Electrical assembly . 23
C.3 Mechanical assembly . 24
C.4 Tests . 24
Annex D (normative) Requirements for explosion protection and prevention for ionisators . 25
Annex E (informative) Ignitability of water-based paints . 26
E.1 General . 26
E.2 Non-ignitable . 26
E.3 Hard to ignite . 26
E.4 Ignitable . 26
Annex ZY (informative) Significant changes between this European Standard and
EN 50050:2006 . 27
Annex ZZ (informative) Coverage of Essential Requirements of EU Directives . 29
Bibliography . 30
Figure
Figure B.1 — Example of a test arrangement . 21
Tables

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Table 1 — Test intervals. 17
Table D.1 — Requirements for ionisators . 25

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Foreword

This document (EN 50050-1:2013) 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
(dow) 2016-10-14
• latest date by which the national standards
conflicting with this document have to
be withdrawn

In combination with EN 50050-2:2013 and EN 50050-3:2013, 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
During the electrostatic coating process the liquid coating material is transported to an applicator where it is
atomised and 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 earthed workpiece.
Droplets, which are not applied to the workpiece (overspray) are removed by a suction device or by other
means.
After the coating process the coated workpieces are introduced into a dryer where the solvent is evaporated
and a dry film of coating material is generated.
0.2 Explosion hazards
0.2.1 An explosion could occur, if
 the concentration of sprayed ignitable liquid coating material in air is within the explosion limits,
 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 an explosive
atmosphere.
0.2.2 An explosive atmosphere can only explode within a given range of concentration, but not, if the
concentration is above or below this range.
NOTE If an explosive mixture of coating materials and air is trapped into a closed room, an explosion can lead to a
fatal increase of pressure.
0.2.3 Particular attention should be paid to the prevention of electrostatic charges on different surfaces
located in the vicinity of the spraying cloud. This could apply to e.g. workpieces during the coating process.
Grounding is critical to the prevention of electrostatic charge to any conductive objects in the spray area.
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 coating materials).
0.3.3 Hazards could occur, for instance, if hazardous malfunctions (e.g. shortcut of electronic safety
circuits) occur due to interferences of the electrostatic 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 liquid coating materials to be used in explosive atmospheres generated by
their own spray cloud within a temperature range from 5 °C to 40 °C.
This European Standard deals with all hazards significant for the electrostatic spraying of liquid coating
materials, 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-L according to Table 1 of EN 50176:2009.

1.2 With regard to explosion protection and prevention measures, this European Standard also applies to
ionisators with high voltage corona charging. Ionisators in conformity with EN 50050-1 provide equipment
category 2G. Parts of ionisators, which are intended to be used or installed in Zone 2, provide equipment
category 3G in conformity with EN 50050-1:2013, see Annex D.
1.3 Electrostatic applicators are considered to be equipment of group II, category 2G for use in potentially
explosive areas of zone 1 or 2, which have been generated by the equipment itself. All other parts of hand-
held electrostatic spraying equipment are considered to be equipment of category 3G if they are installed or
used in potentially explosive areas of zone 2.
1.4 All other significant hazards relevant for applicators (e.g. ejection of fluids, mechanical strength,
electrical hazards (apart from the electrostatic hazards), noise, explosion, contact with or inhalation of
dangerous substances, ergonomics) are covered by EN 1953.
1.5 This European Standard also gives details regarding quality assurance systems for electrostatic
spraying equipment, see Annex C.
1.6 Additional requirements may be applicable to equipment designed for use in food and pharmaceutical
industry.
1.7 This European Standard does not apply to
 zone classification of the areas in and around spray booths [see EN 12215],
 zone classification of other areas with potentially explosive atmosphere [see EN 60079-10-1],
 selection, erection and application of other electrical and non-electrical equipment in areas with explosion
hazard [see EN 60079-14 and EN 12215],
 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 12215],
 requirements for machinery for the supply and recirculation of coating material under pressure [see
EN 12621].
1.8 When processing coating materials having specific electrical properties (conductivity, resistivity) the
function of the hand-held spraying equipment to charge coating materials electrostatically may be affected as
a result of a voltage drop at the charging electrode.

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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 1149-5 Protective clothing – Electrostatic properties – Part 5: Material
performance and design requirements
EN 1953 Atomising and spraying equipment for coating materials –
Safety requirements
EN 12215 Coating plants – Spray booths for application of organic liquid coating
materials – Safety requirements
prEN 50059:2011 Electrostatic hand-held spraying equipment – Safety requirements –
Hand-held spraying equipment for non-ignitable coating materials
EN 50176:2009 Stationary electrostatic application equipment for ignitable liquid coating
material – Safety requirements
EN 60079-0 Explosive atmospheres – Part 0: Equipment - General requirements
(IEC 60079-0)
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 with ignitable liquid coating materials,
generally comprising the following parts:
 applicator;
 coating material supply system;
 control device;
 high voltage supply system, if applicable (can be an integral part of the applicator);
 connecting cable
3.2
connecting cable
electric cable to the applicator
3.3
earthing device
device for earthing the electrostatic hand-held spraying equipment permanently
3.4
spraying device
outlet opening for the coating materials
3.5
high voltage electrode
conductive part of the applicator which is at high voltage and serves to charge the coating materials directly
or indirectly
3.6
control device
device generally having the following functions:
 control of, for instance, the coating material supply system and the control 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 coating materials
Note 1 to entry: In general, the applicator comprises the following parts:
- high voltage electrode;
- high voltage supply, if applicable, can be an integral part of 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 coating material 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
coating material supply system
in general, coating material supply system comprising the following:
 reservoir for coating materials;
 dosing and mixing devices for coating materials;
 supply lines for coating materials;
 devices for drive, control and monitoring of coating materials
3.12
workpiece
article to which the coating material is applied
3.13
ignitable liquid coating materials (coating material)
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 1 to entry: A formula for the estimation of ignitability on the basis of the composition of the coating material is
given in Annex E.
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
Note 1 to entry: See 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

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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 an incendive 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.
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 an incendive 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 an incendive 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
ionisator
an ionisator is a device to discharge electrostatic charge e.g. from workpieces
3.25
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 liquid coating
materials
4.1 General requirements
4.1.1 Hand-held spraying equipment shall be designed and constructed to prevent exceeding the
maximum transferred charge of single sparks of 60 nC, or the maximum discharge energy of 0,24 mJ.
4.1.2 All conductive parts of the hand-held spraying equipment which are not at high voltage 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 A device shall be present connecting the liquid coating material at or inside the applicator with a
resistance of ≤ 10 kΩ to earth.

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4.1.4 Applicators shall meet the applicable requirements of EN 1953.
4.1.5 If for technical reasons earthing according to 4.1.3 is not possible it shall be ensured that the limit
values specified in 4.1.1 are observed in all modes of operation.
4.1.6 Electrical connecting cables shall be connected to the applicator or associated equipment in a
secured way. Requirements of 5.3.1 shall be fulfilled.
4.1.7 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.
4.1.8 Operating triggers of the applicators shall be biased to the off position. In this position, the coating
material 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.
4.1.9 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.
4.1.10 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, resistors and other electronic components.
Insulating materials of parts under high voltage shall be constructed according to the operation, transport
and storage conditions.
4.1.11 The electric equipment not connected to the high voltage system shall comply with EN 60204-1.
4.1.12 If energy limiting electric components (e.g. resistances) 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.
4.1.13 It shall be ensured that component parts inside the applicator with included potential ignition
sources, except for the spraying device, are separated from explosive atmosphere (e.g. by sealing, IP64, .).
As an alternative, the applicator, except for the spraying device, can be designed according to IP64
according to EN 60529.
4.1.14 Electrical cables connected to the applicator shall have an earthed shielding which is protected
against mechanical damage (e.g. by insulation).
4.1.15 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 1 (e.g. according to EN 62061) or PL c (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
...