IEC 60974-3:2007
(Main)Arc welding equipment - Part 3: Arc striking and stabilizing devices
Arc welding equipment - Part 3: Arc striking and stabilizing devices
Specifies safety requirements for industrial and professional arc striking and arc stabilizing devices used in arc welding and allied processes. Is applicable to stand-alone arc striking and arc stabilizing devices that are either connected to a separate welding power source or built into the welding power source enclosure. This new edition takes into account changes induced by the publication of the third edition of IEC 60974-1 as well as technical changes in the routine test for the built-in unit.
Matériel de soudage à l'arc - Partie 3: Dispositifs d'amorçage et de stabilisation de l'arc
Spécifie les prescriptions de sécurité pour les dispositifs d'amorçage et de stabilisation industriels et professionnels utilisés en soudage à l'arc et techniques connexes. S'applique aux dispositifs d'amorçage et de stabilisation indépendants qui sont soit raccordés à la source de courant de soudage, soit intégrés dans l'enveloppe de la source de courant de soudage. Cette nouvelle édition tient compte des modifications induites par la publication de la troisième édition de la CEI 60974-1, ainsi que de modifications techniques des essais individuels de série pour unité intégrée.
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Standards Content (Sample)
IEC 60974-3
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 3: Arc striking and stabilizing devices
Matériel de soudage à l’arc –
Partie 3: Dispositifs d’amorçage et de stabilisation de l’arc
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IEC 60974-3
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 3: Arc striking and stabilizing devices
Matériel de soudage à l’arc –
Partie 3: Dispositifs d’amorçage et de stabilisation de l’arc
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 25.160 ISBN 2-8318-9389-5
– 2 – 60974-3 © IEC:2007
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Environmental conditions.7
5 Tests .7
5.1 Test conditions.7
5.2 Measuring instruments .7
5.3 Conformity of components.7
5.4 Type tests .7
5.5 Routine tests .7
6 Protection against electric shock .8
6.1 Insulation .8
6.2 Protection against electric shock in normal service (direct contact) .9
6.3 Protection against electric shock in case of a fault condition (indirect contact) .9
7 Thermal requirements.9
8 Abnormal operation .9
9 Thermal protection .10
10 Connection to the input supply network .10
11 Output .10
11.1 Rated peak voltage .10
11.2 Impulse current .11
11.3 Mean energy .14
11.4 Output circuit capacitance discharging .14
12 Control circuits .15
13 Hazard reducing device .15
14 Mechanical provisions .15
15 Rating plate.15
16 Adjustment of the output.16
17 Instructions and markings.16
17.1 Instructions .16
17.2 Markings .17
Annex A (informative) Examples of coupling systems for arc striking and stabilizing
devices .18
Annex B (informative) Example of a rating plate.19
Figure 1 – Rated peak voltage .10
Figure 2 – Measurement of electric charge of impulse current .11
Figure 3 – Arc striking and stabilizing voltage .12
Figure 4 – Measuring circuit for direct contact.12
Figure 5 – Measuring circuit for serial contact.14
Figure 6 – Measuring circuit for capacitance discharging .15
60974-3 © IEC:2007 – 3 –
Figure A.1 – Examples of coupling systems for arc striking and stabilizing devices.18
Figure B.1 – Stand-alone unit .19
Table 1 – Minimum clearances and creepage distances for arc striking and stabilizing
circuits.8
Table 2 – Maximum rated peak voltages .11
– 4 – 60974-3 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 3: Arc striking and stabilizing devices
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
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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
members of its technical committees and IEC National Committees for any personal injury, property damage or
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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 60974-3 has been prepared by IEC technical committee 26:
Electric welding.
This second edition cancels and replaces the first edition published in 2003 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– changes induced by the publication of IEC 60974-1, edition 3;
– routine test for built-in unit (see 5.5.2);
– clarification of calculation of the rated peak voltage (see 11.1 and Figure 1).
60974-3 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/363/FDIS 26/367/RVD
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.
This part of IEC 60974 shall be read in conjunction with IEC 60974-1.
The list of all the parts of IEC 60974, under the general title Arc welding equipment, can be
found on the IEC web site.
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.
– 6 – 60974-3 © IEC:2007
ARC WELDING EQUIPMENT –
Part 3: Arc striking and stabilizing devices
1 Scope
This part of IEC 60974 specifies safety requirements for industrial and professional arc
striking and arc stabilizing devices used in arc welding and allied processes.
This part of IEC 60974 is applicable to stand-alone arc striking and arc stabilizing devices that
are either connected to a separate welding power source or built into the welding power
source enclosure.
NOTE 1 Typical allied processes are for example plasma arc cutting and arc spraying.
NOTE 2 This standard does not include electromagnetic compatibility (EMC) requirements.
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 60974-1:2005, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7:2005, Arc welding equipment – Part 7: Torches
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60974-1 and
IEC 60974-7, as well as the following, apply.
3.1
arc striking device
device which superimposes a voltage on the welding circuit to ignite an arc
3.2
arc stabilizing device
device which superimposes a voltage on the welding circuit to maintain an arc
3.3
arc striking voltage
voltage superimposed on the no-load voltage to ignite an arc
3.4
arc stabilizing voltage
voltage superimposed on the arc voltage to maintain the arc
3.5
arc striking period
period during which the arc striking voltage is superimposed on the no-load voltage
60974-3 © IEC:2007 – 7 –
4 Environmental conditions
As specified in IEC 60974-1, Clause 4.
5 Tests
5.1 Test conditions
As specified in 5.1 of IEC 60974-1.
5.2 Measuring instruments
The accuracy of measuring instruments shall be as follows.
a) Electrical measuring instruments: class 0,5 (±0,5 % of full-scale reading), except for the
measurement of insulation resistance and dielectric strength where the accuracy of the
instruments is not specified, but shall be taken into account for the measurement.
b) Thermometer: ±2 K.
c) High-voltage probe: ±5 %.
5.3 Conformity of components
As specified in 5.3 of IEC 60974-1.
5.4 Type tests
As specified in 5.4 of IEC 60974-1, with the addition of the following requirement.
Rated arc striking and stabilizing peak voltage shall be measured in accordance with 11.1 in
any convenient sequence of type tests but before verifying mechanical provisions.
The other type tests included in this standard may be carried out in any convenient sequence.
5.5 Routine tests
5.5.1 Stand-alone unit
All routine tests shall be carried out on each stand-alone unit in the following sequence:
a) general visual inspection (see 3.7 of IEC 60974-1);
b) continuity of the protective circuit (see Clause 10 and, if applicable, 10.4.2 of IEC 60974-
1);
c) dielectric strength (see 6.1.5 of IEC 60974-1);
d) high-voltage circuit test: working voltage shall be applied to high-voltage circuits to
establish insulation integrity as specified by the manufacturer;
NOTE No-load voltage and connection of the return cable, either to the ground circuit or isolated, affects
working voltage.
e) general visual inspection (see 3.7 of IEC 60974-1).
5.5.2 Built-in unit
The following routine test shall be carried out on each built-in unit in any convenient sequence
for the power source.
a) High-voltage circuit test: working voltage shall be applied to high-voltage circuits to
establish insulation integrity as specified by the manufacturer.
– 8 – 60974-3 © IEC:2007
NOTE No-load voltage and connection of the return cable, either to the ground circuit or isolated, affects
working voltage.
6 Protection against electric shock
6.1 Insulation
6.1.1 General
As specified in 6.1.1 of IEC 60974-1.
6.1.2 Clearances
As specified in 6.1.2 of IEC 60974-1, with the addition of the following requirement.
The minimum clearances of high-voltage components shall be in accordance with Table 1.
Conformity shall be checked by measurement and visual inspection.
6.1.3 Creepage distances
As specified in 6.1.3 of IEC 60974-1, with the addition of the following requirement.
The minimum creepage distances of arc striking and stabilizing circuits shall be in accordance
with Table 1.
Conformity shall be checked by measurement and visual inspection.
Table 1 – Minimum clearances and creepage distances
for arc striking and stabilizing circuits
a b b
Rated peak voltage Clearance Creepage distance
kV mm mm
3 3 6,3
6 5,5 10
8 8 12,5
10 11 16
12 14 20
15 18 25
18 25 30
20 30 35
NOTE These values apply to circuits which are designed in
accordance with 11.3.
a
Rated peak voltage shall be measured in accordance with 11.1.
b
Interpolation is allowed.
6.1.4 Insulation resistance
As specified in 6.1.4 of IEC 60974-1.
6.1.5 Dielectric strength
The output circuit of arc striking and stabilizing devices and the insulation of coupling
components (for example, coupling transformers or coupling capacitors) shall withstand an
60974-3 © IEC:2007 – 9 –
arc striking test voltage 20 % higher than the rated peak arc striking voltage at the maximum
pulse repetition rate of the device. Alternatively, an a.c. test voltage with the same peak value
of approximately sine waveform at 50 Hz or 60 Hz may be used for coupling components only.
Conformity shall be checked by the following test.
Coupling components intended for use with arc striking and stabilizing voltages shall be
subjected to the arc striking test voltage or the a.c. test voltage for 60 s.
NOTE Interference suppression capacitors are not coupling devices.
The output circuit shall be subjected to the arc striking test voltage for 60 s applied between
the point of connection to the welding electrode and
a) exposed conductive parts;
b) other isolated circuits.
Flashover or breakdown shall not occur. Any discharges unaccompanied by a voltage drop
(corona) are disregarded.
NOTE Interference suppression capacitors are subjected to the test of the output circuit.
6.2 Protection against electric shock in normal service (direct contact)
As specified in 6.2 of IEC 60974-1.
6.3 Protection against electric shock in case of a fault condition (indirect contact)
As specified in 6.3 of IEC 60974-1, with the addition of the following requirement.
The output circuit shall be electrically isolated from the public supply system by double or
reinforced insulation in accordance with the maximum rated input voltage. Figure A.1 shows
examples of coupling systems for arc striking and stabilizing devices.
Conformity shall be checked by visual inspection.
7 Thermal requirements
Current-carrying components, incorporated in the arc striking and stabilizing device, shall be
capable of carrying the rated welding current as specified by the manufacturer without
a) exceeding the temperature rating of the current-carrying components;
b) causing the surface temperatures, specified in Table 7 of IEC 60974-1, to be exceeded.
For liquid-cooled apparatus, the test shall be carried out with the minimum flow and the
maximum temperature of the coolant, as recommended by the manufacturer.
Conformity shall be checked by measurement in accordance with 7.2 of IEC 60974-1.
8 Abnormal operation
As specified in Clause 8 of IEC 60974-1, with the addition of the following requirement.
In the case of a stand-alone arc striking and stabilizing device the abnormal operation tests
shall be carried out as applicable.
– 10 – 60974-3 © IEC:2007
If the arc striking and stabilizing device is designed for use with a specific welding power
source, the abnormal operation tests shall be conducted with the arc striking and stabilizing
device connected to that welding power source.
The arc stabilizing device shall be short circuited at the output, with neither a torch nor a
return cable connected, until equilibrium is achieved.
Arc striking and stabilizing devices protected internally, for example by automatic shut-off,
meet this requirement if the protection device operates before an unsafe condition occurs.
9 Thermal protection
As specified in Clause 9 of IEC 60974-1, where applicable.
10 Connection to the input supply network
As specified in Clause 10 of IEC 60974-1, with the addition of the following requirement.
Earthing of exposed conductive parts is not required if the arc striking and stabilizing device is
rated for input voltages not greater than safety extra low voltage (SELV) or if the input voltage
is supplied by the welding circuit.
11 Output
11.1 Rated peak voltage
The rated peak voltage for arc striking and stabilizing devices shall not exceed the maximum
values given in Table 2.
The arc striking and stabilizing voltage is obtained by subtraction of the no-load voltage given
in Table 13 of IEC 60974-1 (see Figure 1).
U
U
P
t
IEC 2214/07
Figure 1 – Rated peak voltage
60974-3 © IEC:2007 – 11 –
Table 2 – Maximum rated peak voltages
Type of torch Rated peak voltage
Manually guided 15 kV
Mechanically guided or plasma cutting 20 kV
Conformity shall be checked by measurement with an oscilloscope and a high-voltage probe
with sufficient bandwidth.
The rated peak voltage shall be measured across a 220 pF capacitor with neither a torch nor
a return cable connected.
11.2 Impulse current
11.2.1 Electric charge
The maximum electric charge in one half-cycle of impulse current, regardless of polarity, shall
not exceed (see Figure 2):
– 8 μC for equipment intended to be used with manually guided torches;
and
– 15 μC for equipment intended to be used with mechanically guided torches and plasma
cutting torches.
The maximum electric charge
I A I A
The maximum electric charge
of impulse current
of impulse current
Q μC
Q μC
t μs t μs
IEC 1800/03 IEC 1801/03
a) AC pulse b) DC pulse
Figure 2 – Measurement of electric charge of impulse current
– 12 – 60974-3 © IEC:2007
U
U
t
IEC 2215/07
Figure 3 – Arc striking and stabilizing voltage
11.2.2 Risk of electric shock
Depending on the design of an arc striking and stabilizing device, a risk of electric shock due
to an impulse current may occur under the following situations:
– the human body is in direct contact with the output of the arc striking and stabilizing
device (see 11.2.3);
– the human body is in series with the arc gap as part of the welding circuit (see 11.2.4).
The appropriate test which gives an impulse current achieving the maximum electric charge
shall be selected and carried out.
11.2.3 Direct contact
Conformity shall be checked by voltage measurement with an oscilloscope and a high-voltage
probe with sufficient bandwidth, in a circuit as given in Figure 4, with neither a torch nor a
return cable connected.
R ≥ 10 MΩ
C ≤ 10 pF
–
R
B C
T
+
a
IEC 1802/03
Key
1 Welding or cutting power source 4 High-voltage probe
2 Arc striking and stabilizing device 5 Load as compact as possible
3 Oscilloscope a Connection lead as short as possible
Figure 4 – Measuring circuit for direct contact
To simulate the torch capacitance, the value for C shall be
T
60974-3 © IEC:2007 – 13 –
– 220 pF for equipment intended to be used with torches or return cables up to 10 m length;
or
– 1 000 pF for equipment intended to be used with torches or return cables above 10 m
length.
To simulate the body resistance, the value of a non-inductive resistor R shall be
B
– 1 kΩ for equipment intended to be used in environments without increased hazard of
electric shock or with a mechanically guided torch;
or
– 500 Ω for equipment intended to be used in environments with increased hazard of electric
shock.
The value of the impulse current is obtained by dividing the value of the measured voltage by
the value of the resistor R .
B
11.2.4 Serial contact
Conformity shall be checked by voltage measurement with an oscilloscope and a high-voltage
probe with sufficient bandwidth, in a circuit as given in Figure 5, with neither a torch nor a
return cable connected.
The arc gap (6) (see Figure 5) shall be adjusted to the maximum distance at which flashover
consistently occurs.
To simulate the torch capacitance, the value for C shall be
T
– 220 pF for equipment intended to be used with torches or return cables up to 10 m in
length;
or
– 1 000 pF for equipment intended to be used with torches or return cables above 10 m in
length.
To simulate the body resistance, the value of a non-inductive resistor R shall be
B
– 1 kΩ for equipment intended to be used in environments without increased hazard of
electric shock or with a mechanically guided torch;
or
– 500 Ω for equipment intended to be used in environments with increased hazard of electric
shock.
The value of the impulse current is obtained by dividing the value of the measured voltage by
the value of the resistor R .
B
– 14 – 60974-3 © IEC:2007
R ≥ 10 MΩ
C ≤ 10 pF
–
C R
T
B
+
a
IEC 1803/03
Key
1 Welding or cutting power source 5 Load as compact as possible
2 Arc striking and stabilizing device 6 Arc gap
3 Oscilloscope a Connection lead as short as possible
4 High-voltage probe
Figure 5 – Measuring circuit for serial contact
11.3 Mean energy
The mean energy generated by arc striking and stabilizing devices in a non-inductive resistor,
simulating the body resistance shall not exceed during each period of 1 s
– 4 J for equipment intended to be used with manually guided torches;
and
– 20 J for equipment intended to be used with mechanically guided and plasma cutting
torches.
Conformity shall be checked by testing in accordance with 11.2.
Arc striking and stabilizing devices with a mean energy below 4 J are considered as energy
limited for all parts of IEC 60974.
The arc striking and stabilizing voltage is obtained by subtraction of the no-load voltage given
in Table 13 of IEC 60974-1 (see Figure 3).
11.4 Output circuit capacitance discharging
One second after the arc striking and stabilizing device output is cut off or disabled, the
output voltage shall not exceed 113 V d.c.
Conformity shall be checked by measurement of the voltage in a circuit as indicated in Figure
6 by an oscilloscope and a high-voltage probe.
60974-3 © IEC:2007 – 15 –
R ≥ 10 MΩ
C ≤ 10 pF
–
C
T
+
a
IEC 1804/03
Key
1 Welding or cutting power source 4 High-voltage probe
2 Arc striking and stabilizing device 5 Load as compact as possible
3 Oscilloscope a Connection lead as short as possible
Figure 6 – Measuring circuit for capacitance discharging
To simulate the torch capacitance, the value for C shall be
T
– 220 pF for equipment intended to be used with torches or return cables up to 10 m in
length;
or
– 1 000 pF for equipment intended to be used with torches or return cables above 10 m in
length.
12 Control circuits
As specified in Clause 12 of IEC 60974-1.
13 Hazard reducing device
Not applicable.
14 Mechanical provisions
Only applicable for stand-alone unit as specified in Clause 14 of IEC 60974-1.
15 Rating plate
A clearly and indelibly marked rating plate shall be fixed securely to, or printed on, each
stand-alone arc striking and stabilizing device with the following minimum information:
– 16 – 60974-3 © IEC:2007
a) Identification
1) 2)
3) 4)
b) Output
5)
6) 6a) 6b) 6c)
X
7) 7a) 7b) 7c)
I
c) Energy input
8) 9)
10) 11)
Optional If applicable
1) name and address of the manufacturer and, if required, distributor, importer, trade
mark and country of origin;
2) type (identification) as given by the manufacturer;
3) traceability of design and manufacturing data, for example, serial number;
4) reference to IEC 60974-3, confirming that the arc striking and stabilizing device
conforms with its requirements;
5) U rated peak voltage;
p
6) X.% duty cycle, if applicable;
7) I rated welding current, if applicable;
8) U rated input voltage(s) and frequency;
9) I rated input current(s) at maximum load;
10) IP. degree of protection, for example, IP21 or IP23;
symbol for protection class II, if applicable.
11)
Conformity shall be checked by visual inspection.
In the case of an internal arc striking and stabilizing device, box 5 shall be added to the rating
plate of the power source (see Clause 15 of IEC 60974-1).
16 Adjustment of the output
As specified in Clause 16 of IEC 60974-1.
17 Instructions and markings
17.1 Instructions
As specified in 17.1 of IEC 60974-1, with the addition of the following requirement.
The manufacturer shall state in the instructions
– the rated peak voltage;
– if the arc striking and stabilizing device is designed for manual or mechanically guided
operation.
60974-3 © IEC:2007 – 17 –
If the use of longer torch or return cables increases the risk of electric shock (see limits
of Clause 11) due to an impulse current, the manufacturer shall specify the maximum length
(in m) and a torch type. The following warning shall be given:
Warning: Increasing the length of torch or return cables more than manufacturer maximum
specified length will increase the risk of electric shock.
17.2 Markings
Only applicable for stand-alone units, as specified in 17.2 of IEC 60974-1.
– 18 – 60974-3 © IEC:2007
Annex A
(informative)
Examples of coupling systems for arc striking and stabilizing devices
2 6
1 1
5 5 3
4 4
IEC 1805/03
IEC 1806/03
a) b)
8 2
1 1
3 3
5 5
4 4
IEC 1807/03 IEC 1808/03
c)
d)
Key
1 Welding or cutting power source 5 Voltage generator
2 Arc striking and stabilizing device 6 Choke
3 Output 7 Input coupling winding
4 Voltage supply 8 Blocking diode
Figure A.1 – Examples of coupling systems for
arc striking and stabilizing devices
60974-3 © IEC:2007 – 19 –
Annex B
(informative)
Example of a rating plate
a) Identification
1) 2)
Manufacturer Type
3) 4)
Serial number IEC 60974-3
b) Output
5)
U = 8,5 kV
p
6) 6a) 6b) 6c)
X 35 % 60 % 100 %
7) 7a) 7b) 7c)
I 300 A 220 A 180 A
c) Energy input
8) 9)
U = 230 V I = 0,5 A
1 1
10) 11)
IP23
IEC 2216/07
Figure B.1 – Stand-alone unit
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– 20 – 60974-3 © CEI:2007
SOMMAIRE
AVANT-PROPOS.22
1 Domaine d’application .24
2 Références normatives.24
3 Termes et définitions .24
4 Conditions d’environnement .25
5 Essais .25
5.1 Conditions d’essais .25
5.2 Instruments de mesure.25
5.3 Conformité des composants .25
5.4 Essais de type.25
5.5 Essais individuels de série .25
6 Protection contre les chocs électriques.26
6.1 Isolement .26
6.2 Protection contre les chocs électriques en service normal (contact direct).27
6.3 Protection contre les chocs électriques en cas de défaut (contact indirect).27
7 Exigences thermiques .27
8 Fonctionnement anormal .28
9 Protection thermique .28
10 Raccordement au réseau d’alimentation .28
11 Sortie .28
11.1 Valeur assignée de la tension de crête .28
11.2 Courant d’impulsion.29
11.3 Energie moyenne .32
11.4 Déchargement des capacités du circuit de sortie .32
12 Circuits de commande .33
13 Dispositif réducteur de risques .33
14 Dispositions mécaniques .33
15 Plaque signalétique .33
16 Réglage de la sortie .34
17 Instructions et marquage .34
17.1 Instructions .34
17.2 Marquages .35
Annexe A (informative) Exemples de systèmes de connexion pour les dispositifs
d’amorçage et de stabilisation de l’arc .36
Annexe B (informative) Exemple de plaque signalétique .37
Figure 1 – Courant de crête assigné .28
Figure 2 – Mesure de la charge électrique du courant d’impulsion .29
Figure 3 – Tension d'amorçage et de stabilisation de l'arc .30
Figure 4 – Circuit de mesure pour courant d’impulsion.30
Figure 5 – Circuit de mesure pour contact en série .32
Figure 6 – Circuit de mesure pour déchargement de capacitance .33
60974-3 © CEI:2007 – 21 –
Figure A.1 – Exemples de systèmes de connexion pour dispositifs d’amorçage et de
stabilisation de l’arc .36
Figure B.1 – Unité indépendante.37
Tableau 1 — Distances dans l’air et lignes de fuite minimales pour les circuits
d’amorçage et de stabilisation de l’arc .26
Tableau 2 – Tensions de crête assignées maximales.29
– 22 – 60974-3 © CEI:2007
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
MATÉRIEL DE SOUDAGE À L’ARC –
Partie 3: Dispositifs d’amorçage et de stabilisation de l’arc
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
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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
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mesure possible, à appliquer de façon transparente les Publications de la CEI dans leurs publications
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responsabilité pour les équipements déclarés conformes à une de ses Publications.
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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
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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.
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l’objet de droits de propriété intellectuelle ou de droits analogues. La CEI ne saurait être tenue pour
respons
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