IEC 60519-7:2008

IEC 60519-7
Edition 2.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety in electroheat installations –
Part 7: Particular requirements for installations with electron guns

Sécurité dans les installations électrothermiques –
Partie 7: Exigences particulières pour les installations comportant des canons à
électrons
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IEC 60519-7
Edition 2.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety in electroheat installations –
Part 7: Particular requirements for installations with electron guns

Sécurité dans les installations électrothermiques –
Partie 7: Exigences particulières pour les installations comportant des canons à
électrons
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
M
CODE PRIX
ICS 25.180.10 ISBN 2-8318-9634-7

– 2 – 60519-7 © IEC:2008
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Components of electron beam installations.7
5 Types of electron guns .7
6 Main risks.7
7 Earthing of high-voltage parts in gun chamber during maintenance .8
7.1 Manual earthing device .8
7.2 Mechanical earthing system .8
7.3 Automatic earthing system .8
8 High-voltage feeding .8
8.1 High-voltage feeder cables .8
8.2 Return conductor.9
8.3 Minimum distance between bare high-voltage components.9
9 Protection against electric shock .9
10 Protection against overcurrent and overvoltage .10
10.1 General requirements.10
10.2 High-voltage power supply .10
11 Equipotential bonding .10
12 Control circuits and control functions .10
12.1 Control circuits .10
12.2 Control functions .10
13 Liquid cooling .10
14 Risks caused by certain processes or components .11
14.1 Risk of fire.11
14.2 Danger of explosion .11
14.3 Environmental pollution .11
14.4 Health hazards .11
14.5 Vacuum plant .11
15 X-rays .12
16 Marking, labelling, technical documentation and instructions .12
16.1 Marking, labelling and technical documentation.12
16.2 Information on inspection and commissioning, and instructions for utilization
and maintenance of installations with electron guns .12

60519-7 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY IN ELECTROHEAT INSTALLATIONS –

Part 7: Particular requirements for installations
with electron guns
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60519-7 has been prepared by IEC technical committee 27:
Industrial electroheating equipment.
This second edition cancels and replaces the first edition published in 1983 and constitutes a
technical revision.
The significant changes with respect to the previous edition are as follows:
• the latest edition of IEC 60519-1 has been taken into account (the structure of clauses
was adapted to it as far as practicable);
• some definitions have been modified or brought into line with IEC 60050-841:2004;
• Clauses 4 and 5 were added;
• requirements for the earthing system were updated according to technical progress;
• the arrangement of the return conductor was changed to avoid earthing connections from
the process current as far as possible;

– 4 – 60519-7 © IEC:2008
• possible risks caused by certain processes or components were described in Clause 14.
This part of IEC 60519 is to be used in conjunction with IEC 60519-1:2003. It is intended to
specify particular requirements for electroheating installations with electron guns.
The text of this standard is based on the following documents:
FDIS Report on voting
27/578/CDV 27/622/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The list of all parts of the IEC 60519 series, under the general title Safety in electroheat
installations, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60519-7 © IEC:2008 – 5 –
SAFETY IN ELECTROHEAT INSTALLATIONS –

Part 7: Particular requirements for installations
with electron guns
1 Scope
This part of IEC 60519 deals with safety of electroheat installations with electron guns. It
applies to all the electroheat applications with electron guns.
This standard, whilst prepared for electroheat installations with electron guns may, however,
also be used for non-thermal applications with electron guns and equipment employing glow
discharge systems, where applicable.
This standard applies also to high-voltage sources feeding electron guns.
All requirements of IEC 60519-1 apply. Additional requirements for installations covered by
this part of the standard are given in Clauses 6 to 16.
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.
IEC 60050-841:2004, International Electrotechnical Vocabulary – Part 841: Industrial
electroheat
IEC 60204-1:2005, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60364-4-43, Electrical installations of buildings – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60519-1:2003, Safety in electroheat installations – Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-841,
IEC 60519-1 and the following apply.
3.1
electron beam
electron flux emitted from one source (cathode or plasma) and moving along the exactly
determined tracks at very great velocities
[IEV 841-30-01, modified]
3.2
electron (beam) gun
system of generating, forming and accelerating one or more electron beams

– 6 – 60519-7 © IEC:2008
[IEV 841-30-08, modified]
3.3
anode (of an electron gun)
electrode capable of educing and accelerating electrons from the medium of lower
conductivity
[IEV 841-22-31, modified]
3.4
cathode (of an electron gun)
electrode capable of emitting electrons from the medium of low conductivity and also of
receiving positive carriers, if necessary
[IEV 841-22-32, modified]
3.5
beam accelerating voltage
potential difference between the cathode and the anode, to generate an electric field for
acceleration of electrons
[IEV 841-30-29]
3.6
high-voltage power supply
source of the acceleration voltage and of the emission current for electron guns
3.7
return conductor
electrical interconnection between the high-voltage power supply (positive pole) and anodic
part of the electron gun system including the vacuum chamber around the workpiece
3.8
interlock
device that prevents activation of a piece of equipment when any form of hazard or danger
exists
3.9
vacuum chamber
enclosed space of a vacuum plant constructed in such a way that it can withstand a rarefied
atmosphere inside, in which the workpiece to be treated is placed
3.10
electron gun chamber
vacuum chamber in which the electron gun is located
NOTE This chamber may be separated from the workpiece by an aperture, so that between the electron gun and
the workpiece, a pressure difference can be established.
3.11
electron beam deflection system
electromagnetic coil or deflecting electrodes system, applied to place the beam to different
working positions or move the beam over the charge heat surface
[IEV 841-30-25, modified]
3.12
electron beam bending system
electromagnetic coil or permanent magnet for changing the direction of the electron beam
outside the electron gun
60519-7 © IEC:2008 – 7 –
3.13
electron beam focussing system
electromagnetic coil, system of coils or capacitor plates for focusing the electron beam over
the charge heating surface
[IEV 841-30-27, modified]
4 Components of electron beam installations
An electron beam installation primarily consists of:
a) an electron gun;
b) a high-voltage power supply;
c) an electron beam deflection and focussing system including the necessary current supply
and control systems;
d) an electron beam bending system;
e) a process chamber and workpiece handling;
f) a vacuum plant;
g) a control system;
h) facilities (electrical supply, cooling liquid, pneumatics, hydraulics, etc.).
NOTE Some components are only in specific installations, for example there is no bending system in many
installations.
5 Types of electron guns
The principle of electron beam exploited in electron guns is mainly used in
• optical applications (for example CRT, video projection, image scanning, electron
microscopy),
• other non-thermal applications (for example polymer modification, curing, sterilization,
disinfection) and
• electroheat applications.
Typical electroheat applications are for example melting, heating, evaporation and surface
treatment.
Depending on the application, electron beam guns can be classified according to
• the level of the acceleration voltage,
• the rated power,
• the electron beam geometry and
• the system for beam deflection and bending.
6 Main risks
Electron guns used for electroheat applications, due to their properties, may basically
generate the following risks:
7, 8, 9 and 11);
• high-voltage electric shock (see Clauses
• X-rays (see Clause 15);
• thermal destruction of components inside a vacuum chamber caused by high energy
density (see Clause 14).
– 8 – 60519-7 © IEC:2008
In addition, there may exist hazards caused by components of the electron beam installation
like a vacuum plant (see Clause 12) and by the process realized by electron beam guns (see
Clause 14).
7 Earthing of high-voltage parts in gun chamber during maintenance
7.1 Manual earthing device
After switching off the high-voltage supply and gaining access by opening the door of the
electron gun chamber or the housing of the electron gun, a portable earthing device of an
approved design shall be used to remove any remaining charge before touching parts, which
are normally live during operation.
The highly flexible earth conductor of the portable earthing device shall be permanently fixed
to its earthing point. This earth connection point shall be visible for easy checking by the
operator and be clearly and durably marked.
7.2 Mechanical earthing system
Alternatively, a mechanically self-acting earthing mechanism that is activated by the
mechanical action of opening the gun chamber may be installed, provided that the proper
function of this self-acting mechanism can be easily checked by eyesight from a safe distance.
7.3 Automatic earthing system
Alternatively, an automatically operating earthing mechanism may be installed under the
following conditions:
a) the mechanism is automatically activated when the gun operation is stopped;
b) the proper functioning of the automatic mechanism is detected by a fail-proof automatic
detection system;
c) a signal visible to personnel opening the gun chamber indicates proper functioning of the
automatic earthing system;
d) an electro-mechanic lock of approved design disables opening of the gun chamber before
the proper functioning of the earthing device has been positively detected.
Also, in the immediate vicinity of the high-voltage supply(ies), portable earthing devices shall
be installed so as to be clearly visible.
8 High-voltage feeding
8.1 High-voltage feeder cables
The high-voltage feeder cables shall be adequately insulated and efficiently protected against
mechanical damage.
Shielded cables shall be used for the high-voltage feeders or the feeder cables shall be
installed inside conductive conduits or flexible hoses. Cable shields, conduits or flexible hoses
shall be connected to the equipotential bonding.
When high-voltage feeder cables are laid inside conduits or flexible hoses, other cables shall
not be included, except a return conductor. Each electron gun shall have its own conduit or
flexible hose.
If the high-voltage feeder cable runs inside a conduit or flexible hose, the conduit or flexible
hose shall extend into the high-voltage terminal connection compartment.

60519-7 © IEC:2008 – 9 –
High-voltage feeder cables and low-voltage cables may run together inside cable trenches or
cable troughs providing the high-voltage feeder cables are protected mechanically and
electrically. The cable trenches or troughs are not considered as protection.
8.2 Return conductor
Each electron gun shall have its own return conductor to carry the beam current back to the
high-voltage power supply in a specified way. The cross-sectional area of this conductor shall
be of a size corresponding to the current of the gun but not less than 6 mm copper. The
return conductor shall be installed with flexible and insulated cable.
The return conductor shall be connected to earth potential at the termination point near the
workpiece or the electron gun.
To enable a defined return current path, the return conductor shall not be earthed at the high-
voltage power supply, but the voltage between the termination point and earth shall be limited
by reliable means. If the return conductor is also directly connected to earth at the high-
voltage supply, EMC requirements and grounding shall be taken under special care.
If, for special guns, a conductor of less than 6 mm copper is employed, it shall be installed
with special care, be mechanically protected and be at least of the size of the feeder
conductors.
The voltage drop along the return conductor shall not exceed 1,5 V at rated current. Return
conductors between electron guns and the high-voltage power supply shall be installed
together with the feeders.
NOTE 1 Each installation should have at least two return conductors so that safety is maintained even if one fails.
The exact arrangement of return conductors depends on the quality of the electrical interconnections of the
electron gun chamber and the vacuum chamber as well as on the number of electron guns.
NOTE 2 In an installation with electron guns, the return current flows through the chamber and the framework of
the installation in the direct surroundings of the electron gun.
8.3 Minimum distance between bare high-voltage components
Safety spacing applicable for high-voltage equipment need not be observed for electron guns
and their supply as they are designed for use in dry and clean rooms. Such conditions of
usage shall be specified in the manufacturer's installation instructions.
9 Protection against electric shock
The voltage supplies of the electron guns shall be switched off by safety interlocks, if:
• the electron gun chamber is opened and live parts become accessible;
• high-voltage cables are disconnected or assembled in a wrong way, and
• high-voltage enclosures of the power supply are opened.
In these cases, the interlock system shall switch off the voltage supply, discharge high-
voltage capacitors and prevent resetting by reliable means.
In addition, frequently used openings shall be interlocked as long as voltage on covered parts
may occur.
NOTE In the case of more than one gun in the installation, there might be the risk, that different sets of cables be
connected to the high-voltage power supply and the related electron gun. Unconnected ends of these cables could
become live this way. The same risk exists, if spare cables are present in the installation.

– 10 – 60519-7 © IEC:2008
10 Protection against overcurrent and overvoltage
10.1 General requirements
According to IEC 60519-1, protective measures against overcurrent shall be provided in
compliance with relevant standards, for example IEC 60364-4-43 and IEC 60204-1.
10.2 High-voltage power supply
The high-voltage power supply shall be provided with overcurrent and overvoltage protection
adjustable by system settings.
The high-voltage power supply shall not be affected by excessive mains voltage.
11 Equipotential bonding
The provisions of Clause 11 of IEC 60519-1:2003 apply.
To protect operators against voltages between accessible metallic parts, equipotential
bonding shall connect all conductive bodies, frames and enclosures with each other. The
connection between vacuum chamber, electron gun and the high-voltage supply enclosure is
especially important, but working platforms, liquid, hydraulic and gas pipes as well as metallic
constructions of the building shall also be included into equipotential bonding. That way, all
these parts are fixed to earth potential.
The cross-sectional area of these conductors shall be of a size corresponding to the current
of the gun but not less than 6 mm copper.
The equipotential bonding shall be able to carry the current of the electron beam from the
surrounding of the heated work piece and of the electron gun to the termination point of the
return connector without voltage drops exceeding 1,5 V.
12 Control circuits and control functions
12.1 Control circuits
Control circuits shall comply with Clause 9 of IEC 60204-1:2005 and Clause 12 of IEC 60519-
1:2003.
12.2 Control functions
To avoid destruction by the electron beam, its energizing shall be possible only if the following
conditions are fulfilled:
• the operating pressure is reached inside the vacuum chamber;
• the electron beam deflection system is running without any fault;
• the electron beam bending system is energized (if necessary);
• the cooling liquid is running in the specified amount;
• the gun valve is opened (if it exists).
13 Liquid cooling
Where liquid cooling is applied (e.g. in crucibles), appropriate monitoring devices shall be
provided in accordance with 6.6 of IEC 60519-1:2003.

60519-7 © IEC:2008 – 11 –
The clearness of cooling liquid is required to avoid blocking the tube of cooling liquid inside
the electron gun and deflection system.
The requirements for cooling liquid quality shall be given by the manufacturer.
The flow direction of cooling liquid shall be shown.
14 Risks caused by certain processes or components
14.1 Risk of fire
Some process materials can build up at the chamber wall or protection shields in porous
structures. High process temperatures may inflame these layers while venting the process
chamber. Equipment that processes material such as titanium, should give the operator the
possibility for a quick re-evacuation as long as the chamber is being vented with air.
Installations with high power electron guns often use oil insulated transformers placed near
the process chamber. The installation of transformers shall comply with regulations of the
country in which the equipment is to be installed. The manufacturer of the electron gun shall
inform the user about the amount and properties of the transformer oil. The fire load of the oil
shall be considered in planning of fire prevention for the shop floor.
14.2 Danger of explosion
Different materials handled in the process chamber may cause explosion, especially in the
case of cooling water leak. As long as any possibility of explosion cannot be eliminated,
bursting of the chamber shall be avoided by the design of the chamber door locking
mechanism or comparable means.
14.3 Environmental pollution
Process materials and the high-voltage transformer oil may constitute essential risks of
environmental pollution.
If the high-voltage transformer is filled with oil, the transformer shall be installed inside a
container or pit, which is able to collect the entire oil in the case of leak.
Taking into account the kind of the processed materials, the user shall check and take care of
any hazardous substances if exhausted by the vacuum system and/or deposited inside the
process chamber.
14.4 Health hazards
15), other hazards may be caused by processed materials.
In addition to radiation (see Clause
In the case of processing ceramic materials, it is to be considered, that the material may build
up at the chamber wall and protection shields in threadlike structures. Inhalation protection
shall be used in process chamber cleaning to avoid the risk of lung related diseases.
Some applications, especially the operation of electron beams in thin gases, may cause UV-
emission. Protection measures shall be taken according to national regulations.
14.5 Vacuum plant
The exhaust system shall be of adequate size and all precautions shall be taken to protect the
personnel from harmful emissions.

– 12 – 60519-7 © IEC:2008
Moving parts of pumps such as belts, belt pulleys, etc., shall be safeguarded against
accidental touch.
If the vacuum chamber is large enough for a person to enter, means shall be provided to
prevent evacuation of the chamber whilst a person is inside.
15 X-rays
Equipment with electron guns shall be designed and installed to avoid during its operation any
dangerous exposure of the operators to X-ray emission. The levels of radiations shall not
exceed those laid down by national regulations.
The amount of X-ray exposure depends especially on the high-voltage level and also on the
beam current. Design of shielding and the measurement inspection procedure of exposure
shall consider the maximum values of acceleration voltage and beam current.
Parts relevant for X-ray shielding that can be removed during maintenance shall be designed
such that the operation of the gun is not possible without re-mounting these parts. Preferably,
all shielding relevant parts should also be parts of the vacuum chamber.
16 Marking, labelling, technical documentation and instructions
16.1 Marking, labelling and technical documentation
Marking, labelling and technical documentation shall comply with Clause 15 of
IEC 60519-1:2003.
Electrical equipment, generating or distributing high voltage, shall be specially marked in
compliance with local regulations.
The manufacturer of equipment with electron guns shall point out risks of the equipment and
designated processes by danger signs and in the technical documentation. It is the
responsibility of the user to advise against additional risks caused by the real working
conditions, to add corresponding signs and to provide operating instructions.
16.2 Information on inspection and commissioning, and instructions for utilization and
maintenance of installations with electron guns
Information on inspection and commissioning, and instructions for utilization and maintenance
of installations with electron guns shall comply with Clause 16 of IEC 60519-1:2003.
Maintenance at the high-voltage power supply, high-voltage cables and connectors as well as
safety equipment shall only be carried out by:
• manufacturer's staff,
• service personnel, trained and authorized by the manufacturer,
• other skilled and experienced persons, if authorized personnel are not available.
The maintenance instructions shall point out the measures necessary for all risk prevention, in
particular:
• all return conductors shall be checked frequently, for example for loose connections,
broken conductors or frayed ends;
• X-ray inspection shall be done according to national requirements and shall consider the
maximum values for acceleration voltage and beam current. After exchanging X-ray
shielding relevant parts, the emission of X-rays of the system shall be re-checked;

60519-7 © IEC:2008 – 13 –
• in order to avoid damage of devices of the electron beam gun as a result of arcing, each
part of the electron beam gun shall be clean. The cleanness is especially important for all
high-voltage parts;
• according to the process, the user of the equipment shall pay attention to the exhausting
gases of the vacuum system and to the cleaning procedure for the process chamber (see
14.3 and 14.4).
___________
– 14 – 60519-7 © CEI:2008
SOMMAIRE
AVANT-PROPOS.15

1 Domaine d’application .17
2 Références normatives.17
3 Termes et définitions .17
4 Composants des installations à canon à électrons.19
5 Types de canons à électrons .19
6 Dangers principaux.20
7 Mise à la terre des parties haute tension dans l'enceinte du canon au cours de la
maintenance.20
7.1 Dispositif manuel de mise à la terre.20
7.2 Dispositif mécanique de mise à la terre .20
7.3 Dispositif automatique de mise à la terre .20
8 Alimentation à haute tension .21
8.1 Câbles d'alimentation à haute tension .21
8.2 Conducteur de retour .21
8.3 Distance minimale entre les composants à haute tension nus .22
9 Protection contre les chocs électriques.22
10 Protection contre les surintensités et les surtensions.22
10.1 Exigences générales .22
10.2 Alimentation à haute tension .22
11 Liaison équipotentielle.22
12 Circuits de commande et fonctions de commande .23
12.1 Circuits de commande.23
12.2 Fonctions de commande.23
13 Refroidissement par un liquide .23
14 Dangers causés par certains traitements ou composants .23
14.1 Danger dû au feu.23
14.2 Danger d'explosion.24
14.3 Pollution environnementale .24
14.4 Dangers pour la santé .24
14.5 Installation à vide .24
15 Rayons X.24
16 Marques et indications, étiquetage, documentation technique et instructions.25
16.1 Marquage, étiquetage et documentation technique.25
16.2 Informations relatives à l’inspection et la mise en marche, et instructions
concernant l’exploitation et l’entretien des installations à canons à électrons .25

60519-7 © CEI:2008 – 15 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
_____________
SÉCURITÉ DANS LES INSTALLATIONS ÉLECTROTHERMIQUES –

Partie 7: Exigences particulières pour les installations
comportant des canons à électrons

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mondiale de normalisation
composée de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a
pour objet de favoriser la coopération internationale pour toutes les questions de normalisation dans les
domaines de l'électricité et de l'électronique. A cet effet, la CEI – entre autres activités – publie des Normes
internationales, des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au
public (PAS) et des Guides (ci-après dénommés "Publication(s) de la CEI"). Leur élaboration est confiée à des
comités d'études, aux travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les
organisations internationales, gouvernementales et non gouvernementales, en liaison avec la CEI, participent
également aux travaux. La CEI collabore étroitement avec l'Organisation Internationale de Normalisation (ISO),
selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de la CEI
intéressés sont représentés dans chaque comité d’études.
3) Les Publications de la CEI se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de la CEI. Tous les efforts raisonnables sont entrepris afin que la CEI
s'assure de l'exactitude du contenu technique de ses publications; la CEI ne peut pas être tenue responsable
de l'éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de la CEI s'engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de la CEI dans leurs publications
nationales et régionales. Toutes divergences entre toutes Publications de la CEI et toutes publications
nationales ou régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) La CEI n’a prévu aucune procédure de marquage valant indication d’approbation et n'engage pas sa
responsabilité pour les équipements déclarés conformes à une de ses Publications.
6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à la CEI, à ses administrateurs, employés, auxiliaires ou
mandataires, y compris ses experts particuliers et les membres de ses comités d'études et des Comités
nationaux de la CEI, pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre
dommage de quelque nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais
de justice) et les dépenses découlant de la publication ou de l'utilisation de cette Publication de la CEI ou de
toute autre Publication de la CEI, ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’attention est attirée sur le fait que certains des éléments de la présente Publication de la CEI peuvent faire
l’objet de droits de propriété intellectuelle ou de droits analogues. La CEI ne saurait être tenue pour
responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 60519-7 a été établie par le comité d’études 27 de la CEI:
Chauffage électrique industriel.
Cette seconde édition annule et remplace la première édition publiée en 1983 et constitue
une révision technique.
Les modifications significatives par rapport à l'édition antérieure sont les suivantes:
• la prise en compte de la dernière édition de la CEI 60519-1 (la structure des articles a été
adaptée à celle-ci autant que possible);
• la modification ou l’alignement avec la CEI 60050-841:2004 de quelques définitions;
• l’addition des Articles 4 et 5;
• la mise à jour des exigences du système de mise à la terre en fonction du progrès
technique;
– 16 – 60519-7 © CEI:2008
• la modification de la disposition du conducteur de retour afin d'éviter autant que possible
des connexions de mise à la terre dues au courant de traitement;
• la description dans l'Article 14 des éventuels dangers causés par certains traitements ou
composants.
La présente partie de la CEI 60519 doit être utilisée conjointement avec la
CEI 60519-1:2003. Elle a pour objet de spécifier les exigences particulières pour les
installations électrothermiques comportant des canons à électrons.
Le texte
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