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BS EN IEC 60974-1:2021:2022 Edition

BS EN IEC 60974-1:2021:2022 Edition

$256.21

Arc welding equipment – Welding power sources

Published By Publication Date Number of Pages
BSI 2022 162
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This part of IEC 60974 is applicable to power sources for arc welding and allied processes designed for INDUSTRIAL AND PROFESSIONAL USE, and supplied by a voltage not exceeding 1 000 V, BATTERY supplied or driven by mechanical means. This document specifies safety and performance requirements of WELDING POWER SOURCES and PLASMA CUTTING SYSTEMS. This document is not applicable to limited duty arc welding and cutting power sources which are designed mainly for use by laymen and designed in accordance with IEC 60974-6. This document includes requirements for battery-powered WELDING POWER SOURCES and BATTERY packs, which are given in Annex O. This document is not applicable to testing of power sources during periodic maintenance or after repair. NOTE 1 Typical allied processes are electric arc cutting and arc spraying. NOTE 2 AC systems having a nominal voltage between 100 V and 1 000 V are given in Table 1 of IEC 60038:2009. NOTE 3 This document does not include electromagnetic compatibility (EMC) requirements.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Blank Page
7 English
CONTENTS
12 FOREWORD 
14 1 Scope 
2 Normative references 
15 3 Terms and definitions 
16 Tables
Table 1 – Alphabetical list of terms
17 3.1 General terms  and definitions
26 3.2 Terms and definitions related to battery systems 
28 3.3 Terms and definitions related to efficiency and idle state power measurement 
30 4 Environmental conditions 
5 Tests 
5.1 Test conditions 
5.2 Measuring instruments 
31 5.3 Conformity of components 
Figure 1 – Flow chart for conformity methods of 5.3 
32 5.4 Type tests 
5.5 Routine tests 
Figures
33 6 Protection against electric shock 
6.1 Insulation 
34 Figure 2 – Example of insulation configuration for Class I equipment 
35 Table 2 – Minimum clearances for overvoltage category III
37 Table 3 – Minimum creepage distances
38 Table 4 – Insulation resistance
39 Table 5 – Dielectric test voltages
40 6.2 Protection against electric shock in normal service (direct contact) 
42 Figure 3 – Measurement of welding circuit touch current 
Figure 4 – Measurement of touch current in normal condition  
43 6.3 Protection against electric shock in case of a fault condition (indirect contact) 
Table 6 – Minimum distance through insulation
45 7 Thermal requirements 
7.1 Heating test 
46 7.2 Temperature measurement 
48 7.3 Limits of temperature rise 
Table 7 – Temperature limits for windings, commutators and slip-rings
49 7.4 Loading test 
Table 8 – Temperature limits for external surfaces
50 7.5 Commutators and slip-rings 
8 THERMAL PROTECTION
8.1 General requirements 
8.2 Construction 
8.3 Location 
51 8.4 Operating capacity 
8.5 Operation 
8.6 Resetting 
8.7 Indication 
9 Abnormal operation 
9.1 General requirements 
52 9.2 Stalled fan test 
9.3 Short circuit test 
Table 9 – Cross-section of the output short-circuit conductor
53 9.4 Overload test 
9.5 Capacitors short circuit 
10 Connection to the supply network 
10.1 Supply voltage 
54 10.2 Multi-supply voltage 
10.3 Means of connection to the supply circuit 
10.4 Marking of terminals 
55 Table 10 – Current and time requirements for protective circuits
56 10.6 Cable anchorage 
Table 11 – Minimum cross-sectional area of the external protective copper conductor
Table 12 – Verification of continuity of the protective circuit
57 10.7 Inlet openings 
10.8 Supply circuit on/off switching device 
Table 13 – Pull
58 10.9 Supply cables 
59 10.10 Supply coupling device (attachment plug) 
11 Output 
11.1 Rated no-load voltage  
61 Figure 5 – Measurement of RMS values 
Table 14 – Summary of allowable rated no-load voltages
62 11.2 Type test values of the conventional load voltage 
Figure 6 – Measurement of peak values 
63 11.3 Mechanical switching devices used to adjust output 
64 11.4 Welding circuit connections 
65 11.5 Power supply to external devices connected to the welding circuit 
11.6 Auxiliary power supply 
11.7 Welding cables 
66 12 Control circuits 
12.1 General requirement 
12.2 Isolation of control circuits 
12.3 Working voltages of remote control circuits 
13.1 General requirements 
67 13 HAZARD REDUCING DEVICE
13.2 Types of hazard reducing devices 
13.3 Requirements for hazard reducing devices 
Table 15 – Hazard reducing device requirements
68 14 Mechanical provisions 
14.1 General requirements 
14.2 Enclosure 
69 14.3 Handling means 
14.4 Drop withstand 
70 14.5 Tilting stability 
15.1 General requirements 
15.2 Description 
71 15 RATING PLATE
15.3 Contents 
Figure 7 – Principle of the rating plate  
74 15.4 Tolerances 
75 15.5 Direction of rotation 
16 Adjustment of the output 
16.1 Type of adjustment 
16.2 Marking of the adjusting device 
76 16.3 Indication of current or voltage control 
17 Instructions and markings 
17.1 Instructions 
77 17.2 Markings 
78 Annexes
Annex A (normative) Nominal voltages of supply networks 
Table A.1 – Nominal voltages for supply networks with protective overvoltage control
79 Table A.2 – Single-phase three-wire or two-wire AC or DC systems
80 Table A.3 – Three-phase four-wire or three-wire AC systems
81 Annex B (informative) Example of a combined dielectric test 
Figure B.1 – Combined high-voltage transformers 
82 Annex C (normative) Unbalanced load in case of AC tungsten inert-gas welding power sources 
C.1 General 
Figure C.1 – Voltage and current during AC tungsten inert-gas welding 
83 C.2 Unbalanced load 
C.3 Example for an unbalanced load 
Figure C.2 – Unbalanced voltage during AC tungsten inert-gas welding 
84 Figure C.3 – AC welding power source with unbalanced load 
85 Annex D (informative) Extrapolation of temperature to time of shutdown 
86 Annex E (normative) Construction of supply circuit terminals 
E.1 Size of terminals 
E.2 Connections at the terminals 
Table E.1 – Range of conductor dimensions to be accepted by the supply circuit terminals
87 E.3 Construction of the terminals 
E.4 Fixing of the terminals 
88 Annex F (informative) Cross-reference to non-SI units 
Table F.1 – Cross-reference for mm2 to American wire gauge (AWG)
89 Annex G (informative) Suitability of supply network for the measurement of the true RMS value of the supply current 
90 Annex H (informative) Plotting of static characteristics 
H.1 General 
H.2 Method 
H.3 Analysis of the results 
91 Annex I (normative) Test methods for a 10 Nm impact 
I.1 Pendulum impact hammer 
I.2 Free fall spherical steel weight 
Figure I.1 – Test set-up 
Table I.1 – Angle of rotation ( to obtain 10 Nm impact
92 Table I.2 – Mass of the free fall weight and height of the free fall
93 Annex J (normative) Thickness of sheet metal for enclosures 
Table J.1 – Minimum thickness of sheet metal for steel enclosures
94 Table J.2 – Minimum thickness of sheet metal for enclosures of aluminium, brass or copper
95 Annex K (informative) Examples of rating plates 
Figure K.1 – Single-phase transformer 
96 Figure K.2 – Three-phase rotating frequency converter 
97 Figure K.3 – Subdivided rating plate: single-/three-phase transformer rectifier 
98 Figure K.4 – Engine-generator-rectifier 
99 Figure K.5 – Single-/three-phase inverter type 
100 Figure K.6 – Batterypowered welding power source with integral battery 
101 Figure K.7 – Batterypowered welding power source with detachable / separable battery 
102 Annex L (informative) Graphical symbols for arc welding equipment 
L.1 General 
L.2 Use of symbols 
103 L.3 Symbols 
Table L.1 – Letters used as symbols
121 L.4 Examples of combinations of symbols 
123 L.5 Examples of control panels 
Figure L.1 – Input voltage power switch
Figure L.2 – Arc force control potentiometer
Figure L.3 – Remote receptacle and selector switches
124 Figure L.4 – Terminals with inductance selector for MIG/MAG welding
Figure L.5 – Process switch (MMA, TIG, MIG)
Figure L.6 – Selector switch on AC/DC equipment
Figure L.7 – Panel indicator lights (overheat, fault, arc striking, output voltage)
125 Figure L.8 – Setting pulsing parameters using digital display
126 Annex M (informative) Efficiency and idle state power measurement 
M.1 General conditions for measurement 
127 M.2 Measurements 
Table M.1 – Typical nominal electricity supply details for some regions
128 Table M.2 – Load conditions for the arc welding power source
130 M.3 Test report 
Figure M.1 – Measurement procedure  
131 Table M.3 – Required reported data (measured and calculated)
132 M.4 Test report template
134 Annex N (normative) Touch current measurement  
Figure N.1 – Measuring network, touch current weighted for perception or startlereaction 
135 Figure N.2 – Measuring network, touch current weighted for letgo-immobilization  
137 Figure N.3 – Diagram for touch current measurement on fault condition at operating temperature for single-phase connection of appliances other than those of class II 
139 Figure N.4 – Diagram for touch current measurement on fault condition for three-phase four-wire system connection of appliances other than those of class II 
140 Annex O (normative) Battery-powered welding power sources 
O.1 General 
141 O.4 Environmental conditions 
O.5 Tests 
143 O.6 Protection against electric shock 
145 O.7 Thermal requirements 
147 O.8 Thermal protection 
O.9 Abnormal operation 
151 O.10 Connection to the supply network 
153 O.14 Mechanical provisions 
154 O.15 Rating plate 
156 O.17 Instructions and markings 
157 Figure O.1 – Marking of battery voltage class B electric components 
158 Bibliography 

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BS EN IEC 60974-1:2021
$256.21