IEC 60974-2:2007
(Main)Arc welding equipment - Part 2: Liquid cooling systems
Arc welding equipment - Part 2: Liquid cooling systems
Specifies safety and construction requirements for industrial and professional liquid cooling systems used in arc welding and allied processes to cool torches. Is applicable to stand-alone liquid cooling systems 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 set-up.
Matériel de soudage à l'arc - Partie 2: Systèmes de refroidissement par liquide
Spécifie les prescriptions de sécurité et de construction des systèmes de refroidissement par liquide industriels et professionnels utilisés en soudage à l'arc et techniques connexes pour refroidir des torches. S'applique aux systèmes de refroidissement par liquide indépendants qui sont soit raccordés à une source de courant de soudage séparée soit incorporés 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 du montage de simulation.
General Information
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Standards Content (Sample)
IEC 60974-2
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 2: Liquid cooling systems
Matériel de soudage à l'arc –
Partie 2: Systèmes de refroidissement par liquide
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IEC 60974-2
Edition 2.0 2007-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 2: Liquid cooling systems
Matériel de soudage à l'arc –
Partie 2: Systèmes de refroidissement par liquide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 25.160 ISBN 2-8318-9388-7
– 2 – 60974-2 © IEC:2007
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Environmental conditions.6
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) .8
6.3 Protection against electric shock in case of a fault condition (indirect contact) .8
6.4 Connection to the input supply network .8
6.5 Leakage current between welding circuit and protective earth .9
7 Mechanical provisions .9
7.1 General .9
7.2 Cooling liquid overflow .9
7.3 Hose coupling devices and hose connections.10
8 Cooling system.10
8.1 Rated maximum pressure.10
8.2 Thermal requirements .10
8.3 Pressure and temperature .10
9 Abnormal operation .10
9.1 General requirements.10
9.2 Stalled test .11
10 Cooling power .11
10.1 Test procedure .11
11 Rating plate.13
11.1 General .13
11.2 Description.13
11.3 Contents .13
11.4 Tolerances .14
12 Instructions.14
12.1 Supplied documents and information .14
13 Marking .15
13.1 General markings .15
13.2 Inlet and outlet .15
13.3 Pressure warning .15
Annex A (informative) Example diagram of built-in and stand-alone liquid cooling
systems .16
60974-2 © IEC:2007 – 3 –
Annex B (informative) Example for a rating plate of stand-alone cooling system .17
Figure 1 – Leakage current measurement configuration .9
Figure 2 – Measuring circuit for determination of the cooling power .12
Figure 3 – Principle of the rating plate of stand-alone cooling systems.13
Figure A.1 – Example diagram of built-in liquid cooling systems .16
Figure A.2 – Example diagram of stand-alone liquid cooling systems.16
Table 1 – Example of cooling liquid data at 60 °C .12
– 4 – 60974-2 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 2: Liquid cooling systems
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
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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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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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 60974-2 has been prepared by IEC technical committee 26:
Electric welding.
This second edition cancels and replaces the first edition published in 2002 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;
– introduction of a set-up for torch simulation during leakage test;
– complementary requirement for attachment plug in 125 V supply network;
– introduction of new items in instructions;
– correction of density value for water/alcohol (50/50);
– improvement of rating plate example.
60974-2 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/362/FDIS 26/366/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 standard shall be used in conjunction with IEC 60974-1.
The list of all 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 – 60974-2 © IEC:2007
ARC WELDING EQUIPMENT –
Part 2: Liquid cooling systems
1 Scope
This part of IEC 60974 specifies safety and construction requirements for industrial and
professional liquid cooling systems used in arc welding and allied processes to cool torches.
This part of IEC 60974 is applicable to stand-alone liquid cooling systems that are either
connected to a separate welding power source or built into the welding power source
enclosure.
This part of IEC 60974 is not applicable to refrigerated cooling systems.
NOTE 1 Typical allied processes are, for example, plasma arc cutting and arc spraying.
NOTE 2 This part of IEC 60974 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
IEC 60974-10, Arc welding equipment – Part 10: Electromagnetic compatibility (EMC)
requirements
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
cooling power
P
cooling energy related to the mass flow rate
3.2
liquid cooling system
system that circulates and cools liquid used for decreasing the temperature of equipment of
arc welding and allied processes
4 Environmental conditions
See Clause 4 of IEC 60974-1.
60974-2 © IEC:2007 – 7 –
5 Tests
5.1 Test conditions
See 5.1 of IEC 60974-1.
Stand-alone cooling systems may be tested without a welding power source.
Built-in cooling systems shall be tested with the welding power source.
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) Pressure measuring instruments: class 2,5.
d) Flow-rate measuring instruments: class 2,5.
5.3 Conformity of components
See 5.3 of IEC 60974-1.
5.4 Type tests
All type tests shall be carried out on the same cooling system unless specified otherwise.
As a condition of conformity the type tests given below shall be carried out in the following
sequence:
a) general visual inspection (see 3.7 of IEC 60974-1);
b) protection provided by the enclosure (see 6.2.1 of IEC 60974-1);
c) mechanical provisions (see Clause 7);
d) insulation resistance (see 6.1.4);
e) dielectric strength (see 6.1.5).
The other tests included in this standard and not listed here may be carried out in any
convenient sequence.
5.5 Routine tests
All routine tests given below shall be carried out on each cooling system in the following
sequence:
a) general visual inspection (see 3.7 of IEC 60974-1);
b) continuity of the protective circuit (see 10.4.2 of IEC 60974-1);
c) dielectric strength (see 6.1.5);
d) general visual inspection (see 3.7 of IEC 60974-1; for example leaks of cooling liquid and
flow or pressure sensor operation as specified by the manufacturer.
– 8 – 60974-2 © IEC:2007
6 Protection against electric shock
6.1 Insulation
6.1.1 General
See 6.1.1 of IEC 60974-1.
6.1.2 Clearances
See 6.1.2 of IEC 60974-1.
6.1.3 Creepage distances
See 6.1.3 of IEC 60974-1.
6.1.4 Insulation resistance
See 6.1.4 of IEC 60974-1.
The test may be carried out without cooling liquid.
6.1.5 Dielectric strength
See 6.1.5 of IEC 60974-1.
The test may be carried out without cooling liquid.
6.2 Protection against electric shock in normal service (direct contact)
See 6.2 of IEC 60974-1.
6.3 Protection against electric shock in case of a fault condition (indirect contact)
6.3.1 Protective provisions
See 6.3.1 of IEC 60974-1.
6.3.2 Isolation of the supply circuit and the welding circuit
See 6.3.2 of IEC 60974-1.
6.3.3 Insulation between windings of the supply circuit and the welding circuit
See 6.3.3 of IEC 60974-1.
6.3.4 Internal conductors and connections
See 6.3.4 of IEC 60974-1.
6.3.5 Primary leakage current
See 6.3.7 of IEC 60974-1.
6.4 Connection to the input supply network
See Clause 10 of IEC 60974-1.
60974-2 © IEC:2007 – 9 –
Additionally, for 125 V input supply networks, the current rating of the attachment plug shall
be not less than 70 % of the supply current, as measured with the fan motor or pump stalled,
whichever is greater.
6.5 Leakage current between welding circuit and protective earth
With the cooling system filled with the cooling liquid specified by the manufacturer
(see 12.1e)), the leakage current from the torch to the protective earth connection of the
cooling system shall not exceed 10 mA d.c.
The design of the torch can influence the leakage current value; therefore, a conventional
copper pipe shall be used to simulate the torch during the conformity test.
Conformity shall be checked by applying a d.c. voltage of 500 V at room temperature between
the protective earth connection and a copper pipe to simulate the torch connected to the
output of the cooling system by a hose with a maximum length of 0,5 m as shown in Figure 1.
The minimum inner diameter of the hose shall be 5 mm. The minimum length of the copper
pipe shall be 10 cm with a minimum internal diameter of 5 mm. The cooling system and the
simulated torch are filled with liquid for the test. The pump is operating.
0,5 m 0,1 m
A
500 V d.c.
IEC 2209/07
Key
1 Liquid cooling system
2 Hose
3 Copper pipe
Figure 1 – Leakage current measurement configuration
7 Mechanical provisions
7.1 General
See Clause 14 of IEC 60974-1.
The test shall be carried out with cooling liquid.
7.2 Cooling liquid overflow
When filling the cooling system in accordance with the manufacturer's instructions, overflow
or spillage shall not result in electric shock.
– 10 – 60974-2 © IEC:2007
Conformity shall be checked by the following treatment and test. The liquid container is
completely filled. A further quantity of liquid equal to 15 % of the capacity of the container or
0,25 l, whichever is the greater, is then poured in steadily over a period not to exceed 60 s.
Immediately after this treatment, the equipment shall pass the dielectric strength test of 6.1.5
between input circuits and exposed conductive parts.
7.3 Hose coupling devices and hose connections
If hose coupling devices or hose connections, which often have to be undone, are placed
above or near to live parts, these live parts shall be protected from cooling liquid by splash
proof enclosures, with drains or other appropriate measures. An exception is made for live
parts of the welding circuit.
8 Cooling system
8.1 Rated maximum pressure
The manufacturer shall determine the rated maximum pressure attainable by the cooling
system (see 11.3c), box 12).
Conformity shall be checked by measuring the pressure when the outlet is blocked.
8.2 Thermal requirements
8.2.1 Heating test
Liquid cooling systems shall be capable of operating at rated cooling power without causing
any component to exceed its rated temperature.
Conformity shall be checked in accordance with Clause 10.
8.2.2 Tolerances of test parameters
+10 %
a) p pressure: p
−2 %
+10 %
b) q volume flow: q
v v
−2 %
c) T temperature: T ± 2 K
8.2.3 Duration of test
See 7.1.3 of IEC 60974-1.
8.3 Pressure and temperature
Liquid cooling systems shall be capable of operating without leakage at the maximum
pressure with a cooling liquid temperature of 70 °C.
Conformity shall be checked by visual inspection during 120 s of operation or until shutdown
by a protection system, immediately following the heating test while the outlet of the cooling
system is blocked.
9 Abnormal operation
9.1 General requirements
A cooling system shall not suffer hazardous electrical breakdown or cause a risk of fire under
the conditions of operation of 9.2. These tests are conducted without regard to temperature
attained on any part, or the continued proper functioning of the cooling system. The only
60974-2 © IEC:2007 – 11 –
criterion is that the cooling system does not become unsafe. These tests may be conducted
on other cooling systems.
The cooling system, protected internally by, for example, a circuit-breaker or thermal
protection, meets this requirement if the protection device operates before an unsafe
condition occurs.
Conformity shall be checked by the following tests.
a) A layer of dry absorbent surgical type cotton is placed under the cooling system,
extending beyond each side for a distance of 150 mm.
b) Starting from the cold state, the cooling system is operated in accordance with 9.2.
c) During the test, the cooling system shall not emit flames, molten metal or other materials
that ignite the cotton indicator.
d) Following the test and within 5 min, the cooling system shall be capable of withstanding a
dielectric test in accordance with 6.1.5.
9.2 Stalled test
A cooling system, which relies on motor-driven fan(s) and pump(s) for conformity with the
tests of 8.2, is operated at rated supply voltage or rated load speed for a period of 4 h while
the fan motor(s) and pump(s) is(are) stalled or disabled at the output condition of 8.2.1, which
produces the maximum heating.
NOTE The intention of this test is to run the cooling system with the fan stationary. The fan may be blocked
mechanically or disconnected.
10 Cooling power
10.1 Test procedure
Cooling power data shall be given in kW for 100 % duty cycle (duty factor), with the cooling
liquid as recommended by the manufacturer and at an ambient air temperature at 25 °C (see
tolerances of test parameters in 8.2.2). For these values the volume flow shall be 1 l/min.
This test may be carried out on a separate cooling system.
A built-in cooling system may additionally be heated by the welding power source. Therefore,
the test shall be performed together with the welding power source, set for maximum heating.
Conformity shall be checked by the following test and calculation:
a) the liquid cooling system is filled with the amount and type of cooling liquid recommended
in the manufacturer's instructions;
b) the liquid cooling system is connected to a measuring circuit according to Figure 2;
c) the valve is adjusted to obtain a flow of 1 l/min ± 0,1 l/min;
d) the electric heater is adjusted to give a stable condition at a temperature 40 K ± 2 K over
ambient air temperature at the inlet of the liquid cooling system;
e) the inlet and outlet temperature is measured directly at the liquid cooling system. Heat
losses of the measuring device should be as low as possible;
f) the test is carried out for a period of not less than 60 min and continued until the rate of
temperature rise does not exceed 2 K/h.
The cooling power is calculated by the following formulae:
– 12 – 60974-2 © IEC:2007
P = (T − T ) q c q = q ρ
1 2 v
m m
where
P is the cooling power (kW);
T is the temperature of inlet flow (K);
T is the temperature of outlet flow (K);
T – T is the temperature difference (K);
1 2
q is the mass flow (kg/s);
m
q is the volume flow (l/s);
v
c is the specific heat capacity of the cooling liquid (see example in Table 1)(kJ/(kg×K));
ρ is the density of the cooling liquid (see example in Table 1) (kg/l).
IEC 2210/07
Key
1 Liquid cooling system 4 Thermometer (T) 7 Electrical heater
2 Inlet flow 5 Adjustable valve 8 Thermometer (T )
3 Outlet flow 6 Flow meter
Figure 2 – Measuring circuit for determination of the cooling power
Table 1 – Example of cooling liquid data at 60 °C
Specific heat Density (ρ)
Liquid capacity (c)
kg/l
kJ/(kg × K)
Water/ethanol (50/50) 3,85 0,88
Water/ethylene glycol (50/50) 3,44 1,07
Water/propylene glycol (50/50) 3,69 1,04
Water/ethylene glycol (10/90) 2,670 1,10
Water/propylene glycol (10/90) 2,846 1,02
NOTE Figures in parentheses in column 1 are volume ratios.
60974-2 © IEC:2007 – 13 –
11 Rating plate
11.1 General
See Clause 15 of IEC 60974-1.
11.2 Description
The rating plate shall be divided into three sections:
a) identification of stand-alone cooling systems;
b) energy input of stand-alone cooling systems;
c) liquid cooling system.
The arrangement and sequence of the data shall comply with the principle shown in Figure 3
(for an example, see Annex B).
The dimensions of the rating plate are not specified and may be chosen freely.
NOTE Additional information may be given, if necessary, on a special rating plate. Further useful information may
be given in technical literature supplied by the manufacturer (see Clause 12).
In the case of built-in cooling systems, section c) of Figure 2 shall be added to the rating plate
of the welding power source. See Clause 15 of IEC 60974-1.
a) Identification
1)
2) 3)
4)
b) Energy input
5) 6) 7)
8) 9)
If applicable
c) Liquid cooling system
10) 11) 12)
IEC 2211/07
Figure 3 – Principle of the rating plate of stand-alone cooling systems
11.3 Contents
a) Identification
Box 1 Name and address of the manufacturer and if required distributor, importer, a
trade mark and the country of origin
Box 2 Type (identification) as given by the manufacturer
Box 3 Traceability of design and manufacturing data (for example, serial number)
Box 4 Reference to IEC 60974-2 confirming that the cooling system complies with its
requirements
b) Energy input
Box 5 Symbol for mains supply
– 14 – 60974-2 © IEC:2007
Box 6 U . V / 1(3)~ . Hz Rated supply voltage, number of phases (for
example, 1 or 3), symbol for a.c. current ~, and rated
frequency, for example, 50 Hz or 60 Hz
Box 7 I . A Maximum rated supply current
1max
Box 8 IP Degree of protection, for example, IP 21S or IP 23S
Box 9 Symbol for protection class II, if applicable
c) Liquid cooling system
Box 10 Symbol for cooling
Box 11 P . kW Rated cooling power at 1 l/min of cooling liquid flow
1 l/min
at 25 °C
Box 12 p . Pa (bar) Rated maximum pressure
max
Conformity shall be checked by visual inspection and by checking of the complete data.
11.4 Tolerances
Manufacturers shall meet rating plate values within the following tolerances by controlling
component and manufacturing tolerances:
a) P cooling power in kW
The value shall be not less than that stated on the rating plate.
b) p rated maximum pressure in Pa (bar)
max
The value shall be not greater than that stated on the rating plate.
Conformity shall be checked by comparing the values with those stated on the rating plate.
12 Instructions
12.1 Supplied documents and information
Each cooling system shall be delivered with instructions including the following, as applicable:
a) general description;
b) weight and correct methods of handling stand-alone liquid cooling systems;
c) meaning of indications and graphical symbols;
d) interface requirements for an arc welding power source, for example control power,
control signals, static characteristics and means of connections;
e) correct operational use of the liquid cooling system, for example cooling liquid, cooling
conditions, location, pump characteristic, cooling power characteristic, antifreezes,
recommended additives, pressure range, etc.;
f) limitations and explanation of thermal protection, if relevant;
g) limitations related to the degree of protection provided, for example a cooling system with
a degree of protection of IP 21S is not suitable for storage or use in rain or snow;
h) conditions under which extra precautions are to be observed when welding or cutting, for
example environment with increased hazard of electric shock;
60974-2 © IEC:2007 – 15 –
i) maintenance and service of the liquid cooling system;
j) adequate circuit diagram together with a list of recommended spare parts;
k) warning against the use of non-suitable and conductive cooling liquids and antifreezes;
l) precautions against toppling over, if the liquid cooling system shall be placed on a tilted
plane;
m) correct handling and disposal of the cooling liquid;
n) EMC classification in accordance with IEC 60974-10 (stand-alone cooling systems only);
o) a statement drawing attention to the fact that the ratings were developed at an ambient
temperature of 20 °C to 25 °C and the operating range is specified as –10 °C to +40 °C.
Conformity shall be checked by reading the instructions.
13 Marking
13.1 General markings
See 17.2 of IEC 60974-1.
13.2 Inlet and outlet
The inlet and outlet connections for the cooling liquid shall be clearly and indelibly marked
with the following symbols.
a) Inlet
b) Outlet
In addition, a colour code may be used.
13.3 Pressure warning
If the rated maximum pressure of the liquid cooling system is higher than 0,5 MPa (5 bar), a
warning shall be attached, for instance:
p X MPa
max
– 16 – 60974-2 © IEC:2007
Annex A
(informative)
Example diagram of built-in and stand-alone liquid cooling systems
IEC 2212/07
Key
1 Tank 6 Welding circuit
2 Heat exchanger 7 Welding transformer
3 Pump 8 Transformer
4 Grounded cooling liquid pipes 9 Contact tip
5 Torch
Figure A.1 – Example diagram of built-in liquid cooling systems
IEC 2213/07
Key
1 Tank 5 Torch
2 Heat exchanger 6 Welding circuit
3 Pump 9 Contact tip
4 Grounded cooling liquid pipes
Figure A.2 – Example diagram of stand-alone liquid cooling systems
60974-2 © IEC:2007 – 17 –
Annex B
(informative)
Example for a rating plate of stand-alone cooling system
a) Identification
1)
Manufacturer
Trademark
Address
2) 3)
Type Serial No.
4)
IEC 60974-2
b) Energy input
6) 7)
5)
U = 230 V / 1~ 50 Hz I = 1,2 A
1 1max
8) 9)
IP 23S —
c) Liquid cooling system
11) 12)
P = 0,55 kW p = 0,38 MPa
1 l/min max
10)
___________
– 18 – 60974-2 © CEI:2007
SOMMAIRE
AVANT-PROPOS.20
1 Domaine d'application .22
2 Références normatives.22
3 Termes et définitions .22
4 Conditions ambiantes .23
5 Essais .23
5.1 Conditions d'essai .23
5.2 Instruments de mesure.23
5.3 Conformité des composants .23
5.4 Essais de type.23
5.5 Essais individuels de série .23
6 Protection contre les chocs électriques.24
6.1 Isolement .24
6.2 Protection contre les chocs électriques en service normal (contact direct).24
6.3 Protection contre les chocs électriques en cas de défaut (contact indirect).24
6.4 Raccordement au réseau d'alimentation .25
6.5 Courant de fuite entre le circuit de soudage et le conducteur de protection .25
7 Exigences mécaniques .25
7.1 Généralités.25
7.2 Trop-plein du liquide de refroidissement.26
7.3 Connecteurs et connexions de tuyaux .26
8 Système de refroidissement .26
8.1 Pression maximale assignée .26
8.2 Prescriptions thermiques .26
8.3 Pression et température .26
9 Fonctionnement anormal .27
9.1 Exigences générales .27
9.2 Essai de blocage.27
10 Puissance de refroidissement.27
10.1 Procédé d'essai.27
11 Plaque signalétique .29
11.1 Généralités.29
11.2 Description.29
11.3 Contenu .30
11.4 Tolérances .31
12 Instructions.31
12.1 Documents fournis et information .31
13 Marquage .32
13.1 Marquages généraux.32
13.2 Entrée et sortie.32
13.3 Avertissement contre la pression.32
Annexe A (informative) Schéma des systèmes de refroidissement par liquide
incorporés et indépendants.33
60974-2 © CEI:2007 – 19 –
Annexe B (informative) Exemple d'une plaque signalétique pour un système de
refroidissement indépendant.34
Figure 1 – Configuration de mesure du courant de fuite .25
Figure 2 – Circuit de mesurage pour déterminer la puissance de refroidissement .28
Figure 3 – Principe de la plaque signalétique pour les systèmes de refroidissement
indépendants .30
Figure A.1 – Schéma des systèmes de refroidissement par liquide incorporés .33
Figure A.2 – Schéma des systèmes de refroidissement par liquide indépendants .33
Tableau 1 – Exemples de dates pour le liquide de refroidissement à 60 °C.29
– 20 – 60974-2 © CEI:2007
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
MATÉRIEL DE SOUDAGE À L'ARC –
Partie 2: Systèmes de refroidissement par liquide
AVANT-PROPOS
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