SIST EN 50050:2007
(Main)Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
Electrical apparatus for potentially explosive atmospheres - Electrostatic hand-held spraying equipment
This European Standard specifies the constructional and test requirements for hand-held and handoperated electrostatic spraying equipment and associated apparatus which can be used to spray flammable liquid coating materials, flammable coating powders or flammable flock creating explosive atmosphere in spraying areas which may or may not contain flammable adhesives. This standard only deals with the hazards involved in the coating process when hand-held electrostatic spraying equipment 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 equipment, the safety requirements of EN 1953:1998 shall be met. The spraying equipment shall be constructed suitable for group II category 2 as defined in EN 60079-0.
Elektrische Betriebsmittel für explosionsgefährdete Bereiche - Elektrostatische Handsprüheinrichtungen
Diese Europäische Norm legt die Bau- und Prüfbestimmungen für mit der Hand gehaltene und von der Hand geführte elektrostatische Sprühgeräte und Zubehör fest, die zum Versprühen von brennbaren flüssigen Beschichtungsstoffen, brennbaren Beschichtungspulvern oder brennbarem Flock in Sprüh bereichen verwendet werden können, die auch brennbare Kleber enthalten können oder auch nicht. Diese Norm behandelt nur die Gefahren, die für den Beschichtungsprozess kennzeichnend sind, wenn mit elektrostatischen Handsprühgeräten in der beschriebenen Art und unter Bedingungen, die der Hersteller vorgibt, gearbeitet wird. Bezüglich anderer Gefahren, die beim Gebrauch von Handsprühgeräten entstehen, müssen die Sicherheitsbestimmungen von EN 1953:1998 eingehalten werden. Die Sprühgeräte müssen so gebaut sein, dass sie Gruppe II Kategorie 2 wie in EN 60079-0 definiert entsprechen.
Appareillage électrique pour atmosphères explosibles - Equipement manuel de projection électrostatique
La présente Norme Européenne spécifie les exigences de construction et d'essais pour les matériels manuels de projection électrostatique et leur matériel associé pouvant être utilisés pour projeter de la peinture inflammable, des poudres de revêtement inflammables ou des flocks inflammables dans des emplacements de projection pouvant éventuellement contenir des adhésifs inflammables. Cette norme traite uniquement des risques encourus lors du processus de revêtement lorsque l'on utilise le matériel manuel de projection électrostatique comme prescrit et conformément aux conditions attendues selon le fabricant. Comme pour les autres risques encourus lors de l'utilisation des matériels manuels de projection, les exigences de sécurité de la EN 1953:1998 doivent être satisfaites. Les dispositifs de projection doivent être construits en étant considérés comme des matériels du groupe II catégorie 2 conformément à la EN 60079-0.
Električne naprave za potencialno eksplozivne atmosfere - Ročna oprema za elektrostatično brizganje
General Information
Relations
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EUROPEAN STANDARD
EN 50050
NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM
ICS 87.100 Supersedes EN 50050:2001
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 2006-05-01. 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, 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: rue de Stassart 35, B - 1050 Brussels
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50050:2006 E
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EN 50050:2006 – 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 formal vote and was approved by CENELEC as EN 50050 on
2006-05-01.
This European Standard supersedes EN 50050:2001.
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) 2007-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-05-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of EC Directive
94/9/EC. See Annex ZZ.
This European Standard specifies the constructional and test requirements for hand-held and hand-operated
electrostatic spraying and associated equipment which are used to spray flammable coating materials which
may form explosive atmospheres. These spraying equipment are considered to be equipment of group II,
category 2 in accordance with Directive 94/9/EC. It is taken for granted that the equipment will be used in
mechanically ventilated spraying areas or under equivalent ventilation conditions.
__________
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– 3 – EN 50050:2006
Contents
Introduction . 4
1 Scope . 5
2 Normative references . 6
3 Definitions. 7
4 Constructional requirements . 8
4.1 General requirements for all types of spray guns . 8
4.2 Requirements only for spray guns for flammable liquid coating materials . 9
4.3 Requirements only for spray guns for flammable coating powders. 9
4.4 Requirements only for spray guns for flammable flock . 10
5 Type tests .10
5.1 Test requirements for all types of spray guns. 10
5.2 Ignition test for spray guns for liquid paints . 11
5.3 Ignition test for non-triboelectrical spray guns for coating powders . 12
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. 13
7.1 Spray gun . 13
7.2 High-voltage generator, associated equipment. 13
8 Information for users . 14
8.1 Instruction manual. 14
Bibliography. 16
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives. 17
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EN 50050:2006 – 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.
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– 5 – EN 50050:2006
1 Scope
1.1 This European Standard specifies the constructional and test requirements for hand-held and hand-
operated electrostatic spraying equipment and associated apparatus which can be used to spray flammable
liquid coating materials, flammable coating powders or flammable flock creating explosive atmosphere in
spraying areas which may or may not contain flammable adhesives.
This standard only deals with the hazards involved in the coating process when hand-held electrostatic
spraying equipment 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 equipment, the
safety requirements of EN 1953:1998 shall be met.
The spraying equipment shall be constructed suitable for group II category 2 as defined in EN 60079-0.
1.2 Requirements for automatic electrostatic spraying equipment for flammable coating materials are laid
down in EN 50176, EN 50177 and EN 50223.
Hand-held electrostatic spraying equipment can be incorporated in automatic electrostatic spraying
equipment provided the necessary requirements are considered.
1.3 The "General requirements" of EN 60079-0:2006 to be applied to hand-held electrostatic spray guns
and to associated equipment are given in the Table 1 below:
Table 1 – General requirements of EN 60079-0:2006
Clause of EN 60079-0:2006 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 Only 6.1
7 Non-metallic enclosures and non-metallic Only 7.4 No
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
equipment
27 Marking Yes No
Annex A Yes No
1.4 This European Standard does not deal with matters of noise created by the equipment. For this item,
the requirements are laid down in EN ISO 11688-1.
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EN 50050:2006 – 6 –
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.
CLC/TR 50404 2003 Electrostatics – Code of practice for the avoidance of hazards due to static
electricity
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
1)
EN 50176 200X Automatic electrostatic spraying equipment for flammable liquid spraying
materials
EN 50177 2006 Automatic electrostatic spraying equipment for flammable coating powder
EN 50223 2001 Automatic electrostatic application equipment for flammable flock material
EN 60079 series Electrical apparatus for explosive gas atmospheres (IEC 60079 series, mod.)
EN 60079-0 2006 Electrical apparatus for explosive gas atmospheres –
Part 0: General requirements (IEC 60079-0:2004, mod.)
1)
EN 60079-1 200X Electrical apparatus for explosive gas atmospheres –
Part 1: Flameproof enclosures "d" (IEC 60079-1:200X)
2)
EN 60079-7 200X Electrical apparatus for explosive gas atmospheres –
Part 7: Increased safety "e" (IEC 60079-7:2006)
2)
EN 60079-11 200X Electrical apparatus for explosive gas atmospheres –
Part 11: Intrinsic safety "i" (IEC 60079-11:2006)
EN 60529 1991 Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 61241-1 2004 Electrical apparatus for use in the presence of combustible dust –
Part 1: Protection by enclosures "tD" (IEC 61241-1:2004)
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)
1)
At draft stage.
2)
To be published.
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– 7 – EN 50050:2006
3 Definitions
The following definitions, specific to electrostatic liquid coating materials, powder and flock spray guns and
associated equipment, are applicable to this European Standard; they supplement the definitions which are
given in EN 60079.
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 equipment
all the electrical equipment 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 equipment
3.3
spraying material
material which is applied by means of an electrostatic hand-held spraying equipment
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
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EN 50050:2006 – 8 –
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
All equipment and components shall be designed and constructed according to good engineering practice
and in conformity with the requirements for category 2 group II equipment as defined in EN 60079-0 to
ensure avoidance of any ignition source. Requirements given in Clause 1 of EN 60079-0:2006 result from an
ignition hazard assessment which defines the category of electrical equipment.
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 ISO 12100 and the safety
requirements of EN 1953.
As category 2 equipment according to EN 60079-0, running under atmospheric conditions (0 °C to + 40 °C
and 0,8 bar to 1,1 bar), hand-held spraying equipment 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 conductive material of at least
20 cm². This surface of metal or other conductive material shall be connected to the earth terminal (see
4.1.5). 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 Subclause 3.1 or Subclause 3.2 of EN 60079-7:200X 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.
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 (see 5.1.2). This test is not
max
necessary if the high-voltage electrical components, including their enclosures, comply with the requirements
of an appropriate type of protection in EN 60079 for Group II A (e.g. flameproof enclosure "d" according to
EN 60079-1).
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– 9 – EN 50050:2006
4.1.7 The high-voltage cable shall be capable of withstanding a voltage test of 1,2 U (see 5.1.2).
max
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 equipment 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 Subclauses 3.2, 5.1
and 6.6 of EN 60079-11:200X).
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 equipment or part of electrical equipment 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 of protection listed in EN 60079.
For spray guns in the case of whic
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