SIST EN 50050:2002
(Main)Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
With inclusion of agreed editorial corrections * Superseded by EN 50050:2006
Elektrische Betriebsmittel für explosionsgefährdete Bereiche - Elektrostatische Handsprüheinrichtungen
Appareillage électrique pour atmosphères explosibles - Equipement manuel de projection électrostatique
Električne naprave za potencialno eksplozivne atmosfere - Ročna oprema za elektrostatično brizganje
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50050:2002
01-marec-2002
1DGRPHãþD
SIST EN 50050:1996
SIST EN 50050:2007
SIST EN 50053-1:1996
SIST EN 50053-2:1996
SIST EN 50053-3:1996
(OHNWULþQHQDSUDYH]DSRWHQFLDOQRHNVSOR]LYQHDWPRVIHUH5RþQDRSUHPD]D
HOHNWURVWDWLþQREUL]JDQMH
Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held
spraying equipment
Elektrische Betriebsmittel für explosionsgefährdete Bereiche - Elektrostatische
Handsprüheinrichtungen
Appareillage électrique pour atmosphères explosibles - Equipement manuel de
projection électrostatique
Ta slovenski standard je istoveten z: EN 50050:2001
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 50050:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50050:2002
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SIST EN 50050:2002
EUROPEAN STANDARD EN 50050
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2001
ICS 87.100 Supersedes EN 50050:1986
English version
Electrical apparatus for potentially explosive atmospheres -
Electrostatic hand-held spraying equipment
Appareillage électrique pour atmosphères Elektrische Betriebsmittel für
explosibles - explosionsgefährdete Bereiche -
Equipement manuel de projection Elektrostatische Handsprüheinrichtungen
électrostatique
This European Standard was approved by CENELEC on 2001-05-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50050:2001 E
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SIST EN 50050:2002
EN 50050:2001 - 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 explosive
atmospheres.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved
by CENELEC as EN 50050 on 2001-05-01.
This European Standard supersedes EN 50050:1986.
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) 2002-04-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-04-01
This European Standard specifies the constructional and test requirements for hand-held
and hand-operated electrostatic spray guns and associated apparatus which are used to
spray flammable coating materials which may form explosive atmospheres. These spraying
devices are considered to be devices of group II, category 2 in accordance with Directive
94/9/EC. It is taken for granted that the devices will be used in mechanically ventilated
spraying areas or under equivalent ventilation conditions.
Annexes designated "informative" are given for information only.
In this standard, annex A is informative.
__________
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Contents
Introduction. 4
1 Scope. 4
2 Normative references. 5
3 Definitions . 6
4 Constructional requirements. 7
4.1 General requirements for all types of spray guns . 7
4.2 Requirements only for spray guns for flammable liquid coating materials . 8
4.3 Requirements only for spray guns for flammable coating powders . 9
4.4 Requirements only for spray guns for flammable flock . 9
5 Type tests. 9
5.1 Test requirements for all types of spray guns. 9
5.2 Ignition test for spray guns for liquid paints. 11
5.3 Ignition test for non-triboelectrical spray guns for coating powders . 11
5.4 Ignition test for triboelectrical spray guns for coating powders . 12
5.5 Ignition test for spray guns for flock. 12
6 Manufacturer’s responsibility. 12
7 Marking. 12
7.1 Spray gun . 13
7.2 High-voltage generator, associated apparatus . 13
8 Information for users . 13
8.1 Instruction manual . 13
Annex A (informative) Bibliography . 16
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SIST EN 50050:2002
EN 50050:2001 - 4 -
Introduction
When materials are sprayed with hand-held electrostatic spraying equipment, the material is
converted into a cloud of droplets or particles directed to a surface to produce there a
uniform layer of the required thickness and quality. The particles are charged by high
voltage of tens of kilovolts or triboelectrically so that they are attracted by the earthed
workpiece and deposited on it.
1 Scope
1.1 This European Standard specifies the constructional and test requirements for hand-
held and hand-operated electrostatic spraying apparatus and associated apparatus which
can be used to spray flammable liquid coating materials, flammable coating powders or
flammable flock in spraying areas which may or may not contain flammable adhesives.
These spraying devices are considered to be apparatus of group II category 2 in
accordance with Directive 94/9/EC for use in potentially explosive atmospheres formed by
their spray cloud.
This standard only deals with the hazards involved in the coating process when hand-held
electrostatic spraying apparatus is used as prescribed and in accordance with the
conditions which are to be expected according to the manufacturer. As to other hazards
involved in the use of hand-held spraying apparatus, the safety requirements of
EN 1953:1998 "Atomising and spraying equipment for coating materials - Safety
requirements" shall be met.
1.2 This Standard is not applicable to automatic electrostatic spraying equipment for
flammable coating materials (see EN 50176, EN 50177 and EN 50223).
1.3 The "General requirements" of the European Standard EN 50014 to be applied to
hand-held electrostatic spray guns and to associated apparatus are given in the Table
below:
Clause of EN 50014 Spray guns Associated apparatus
outside the
hazardous area
3 Definitions except 3.3 except 3.3
5 Temperatures except 5.2 No
6 General only 6.1.2 only 6.12
7 Non-metallic enclosures and non- only 7.4 No
metallic parts of enclosures
8 Light-alloy enclosures only 8.1 No
9 Fasteners only 9.1 only 9.1
14 Connection facilities for earthing and yes Yes
bonding conductors
15 Connection facilities and terminal yes No
compartments
16 Cable and conduit entries only 16.3 No
24 Routine tests yes Yes
25 Manufacturer responsibility Yes Yes
26 Tests of modified or repaired electrical yes Yes
apparatus
Annex A yes No
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2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies.
EN 292-1 1991 Safety of machinery – Basic concepts, general principles for
design – Part 1: Basic terminology, methodology
EN 292-2 1991 Safety of machinery – Basic concepts, general principles for
+ A1 1995 design – Part 2: Technical principles and specifications
EN 1127-1 1997 Explosive atmospheres – Explosion prevention and protection –
Part 1: Basic concepts and methodology
EN 1953 1998 Atomising and spraying equipment for coating materials – Safety
requirements
EN 50014 1997 Electrical apparatus for potentially explosive atmospheres –
General requirements
EN 50018 2000 Electrical apparatus for potentially explosive atmospheres –
Flameproof enclosures "d"
EN 50019 2000 Electrical apparatus for potentially explosive atmospheres –
Increased safety "e"
EN 50020 1994 Electrical apparatus for potentially explosive atmospheres –
Intrinsic safety "i"
EN 50176 1996 Automatic electrostatic spraying installations for flammable liquid
coating materials
EN 50177 1996 Automatic electrostatic spraying installations for flammable
coating powder
EN 50223 2001 Automatic electrostatic application equipment for flammable flock
material
EN 50281-1-1 1998 Electrical apparatus for use in the presence of combustible dust –
Part 1-1: Electrical apparatus protected by enclosures –
Construction and testing
EN 60079-10 1996 Electrical apparatus for explosive gas atmospheres –
Part 10: Classification of hazardous areas
EN 60204-1 1997 Safety of machinery - Electrical equipment of machines –
Part 1: General requirements
EN 60529 1991 Degrees of protection provided by enclosures (IP Code)
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SIST EN 50050:2002
EN 50050:2001 - 6 -
3 Definitions
The following definitions, specific to electrostatic liquid coating materials, powder and flock
spray guns and associated apparatus, are applicable to this European Standard; they
supplement the definitions which are given in EN 50014.
3.1
hand-held electrostatic paint, powder or flock spraying equipment
equipment for producing, charging and depositing suspended particles with the assistance
of electric fields. It consists in general of the following parts: spray gun, high-voltage
generator and connecting cable
3.1.1
associated apparatus
all the electrical apparatus required to generate and control the electrostatic voltage of the
spray gun
3.1.2
connecting cable
all cables to the spray gun, including high-voltage cables
3.1.3
earth terminal
terminal intended to provide means for reliable earthing of parts of an equipment
3.1.4
high-voltage electrode
conducting part of the spray gun which is at high potential and serves to directly or indirectly
charge the spraying material
3.1.5
high-voltage generator
part of the equipment for producing the high voltage and the corona current required
NOTE The high-voltage generator can be incorporated in the spray gun.
3.1.6
spray gun
part of the electrostatic spraying equipment from which the charged spraying material
emerges and which is held and operated by the hand
NOTE This part is named application device in flocking technology.
3.2
hazardous area
area in which explosive atmosphere are, or may be expected to be, present in quantities
such as to require special precautions for the construction, installation and use of electrical
apparatus
3.3
spraying material
material which is applied by means of an electrostatic hand-held spraying equipment
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3.3.1
explosive atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas,
vapour, mist, powders or flock, in which after ignition, combustion spreads throughout the
unconsumed mixture
3.3.2
flammable spraying material
material which may be ignited by contact with an effective source of ignition and which may
continue to burn or explode after removal of the source of ignition
3.4
U
max
maximum rated voltage of the high-voltage generator
3.5
workpiece
article on which the spraying material is to be deposited
4 Constructional requirements
4.1 General requirements for all types of spray guns
4.1.1 In view of other hazards which are important without being treated in this standard,
the equipment shall in addition be constructed in accordance with the principles of EN 292
and the safety requirements of EN 1953.
As category 2 equipment according to Directive 94/9/EC, running under atmospheric
conditions (0 °C to + 40 °C and 0,8 bar to 1,1 bar), hand-held spraying apparatus meeting
these requirements is suitable for use in spraying areas.
4.1.2 The handle of the spray gun shall have a contact surface area of coductive material
2
of at least 20 cm . This surface of metal or other conductive material shall be connected to
the earth terminal (see 4.1.7). The resistance of this surface to earth shall not exceed 1 MΩ.
4.1.3 All cables shall be permanently attached to the spray gun (see 5.1.6). For flock
spray guns it is sufficient that all cables are attached securely.
4.1.4 Any cable to the gun, other than those carrying only earthed intrinsically safe
circuits, shall include an earthed metallic screen protected by an insulated sheath. This
does not apply to guns with high voltage generator inside the gun if there are two
independent cables for the earth line on two separated contacts and if the insulation of the
cables is high enough to withstand spraying with the gun directly on the cable. No voltage
peaks on the high voltage generator may occur during this process.
4.1.5 All conductive parts of the spray gun other than those designed to acquire a high
potential shall be assembled so that they remain in electrical contact with each other. These
metal parts shall be connected to the earth terminal in the power supply or control unit of
the high-voltage generator by means of terminals of the type described in 3.1 or 3.2 of the
European Standard EN 50019 or other connections which are equally reliable.
NOTE A method of connection between the metal parts of the spray gun and the earth terminal of the power
supply unit for the high-voltage generator is via the metallic screen referred to in 4.1.4.
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SIST EN 50050:2002
EN 50050:2001 - 8 -
4.1.6 If it is considered possible that a breakdown could occur within cavities where there
could be an explosive atmosphere, the gun shall pass a high-voltage test of 1,2 U
max
(see 5.1.2). This test is not necessary if the high-voltage electrical components, including
their enclosures, comply with the requirements of an appropriate type of protection in
EN 50014 for Group II A (e.g. flameproof enclosure "d" according to EN 50018).
4.1.7 The high-voltage cable shall be capable of withstanding a voltage test of 1,2 U
max
(see 5.1.2).
4.1.8 The operating trigger of the spray gun shall be biased towards the OFF position. The
trigger, when released, shall switch off the high-voltage supply and the spraying material
supply to the spray gun within 2 s.
Multi-outlet high-voltage supplies shall not be used unless isolation for each high-voltage
outlet can be achieved by release of the operating trigger of the spray gun connected to the
outlet concerned.
4.1.9 Any current limiting resistor used in the spray gun or the associated apparatus shall
be so mounted, insulated and protected that it is immune from short circuit and shall be so
rated that it is undamaged when a short circuit occurs between the high-voltage electrode of
the spray gun and earth for 5 min.
4.1.10 Components on which safety in respect of ignition depends and which are built into
the high-voltage supply shall be connected, assembled, etc., so that the safety of the device
cannot be prejudiced.
4.1.11 If zener diodes are used to limit the high voltage, they shall be duplicated. Zener
diodes shall not be operated at more than 2/3 of their manufacturer's rating under a one
fault condition (see 3.2, 5.1 and 6.6 of EN 50020:1994).
4.1.12 Adjusting devices, which could increase the maximum tested high voltage, shall be
durably and permanently locked. This requirement is also applicable to other safety-related
parameters, such as current threshold value and maximum current.
4.1.13 High-voltage supplies equipped with an electronic control unit for high voltage or
current reduction shall meet the requirements of the ignition test according to 5.2 even in
the event of frequently occurring disturbances or equipment faults of the control unit, which
normally have to be taken into account.
4.2 Requirements only for spray guns for flammable liquid coating materials
4.2.1 Any electrical apparatus or part of electrical apparatus of a paint spray gun including
the outer enclosure of the gun, with the exception of the components in the high voltage
circuit, shall comply with the requirements of one or more of the types o
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