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BS EN IEC 60974-1:2018

BS EN IEC 60974-1:2018

$256.21

Arc welding equipment – Welding power sources

Published By Publication Date Number of Pages
BSI 2018 154
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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. This fifth edition cancels and replaces the fourth edition published in 2012 and constitutes a technical revision. The significant changes with respect to the previous edition are the following: –   improvement of Figure 1 (6.1.1); –   modification of Table 3 (6.1.4); –   description of energy efficiency measurements in Annex M; –   inclusion of battery supplied welding power sources in the scope. Requirements therefore are described in Annex O.

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PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
14 FOREWORD
16 1 Scope
2 Normative references
17 3 Terms and definitions
3.1 General terms
26 3.2 Terms related to battery systems
29 4 Environmental conditions
30 5 Tests
5.1 Test conditions
5.2 Measuring instruments
5.3 Conformity of components
31 5.4 Type tests
5.5 Routine tests
32 6 Protection against electric shock
6.1 Insulation
6.1.1 General
33 6.1.2 Clearances
Figures
Figure 1 – Example of insulation configuration for Class I equipment
34 Tables
Table 1 – Minimum clearances for overvoltage category III
35 6.1.3 Creepage distances
36 Table 2 – Minimum creepage distances
37 6.1.4 Insulation resistance
6.1.5 Dielectric strength
Table 3 – Insulation resistance
38 Table 4 – Dielectric test voltages
39 6.2 Protection against electric shock in normal service (direct contact)
6.2.1 Protection provided by the enclosure
6.2.2 Capacitors
40 6.2.3 Automatic discharge of supply circuit capacitors
6.2.4 Isolation of the welding circuit
6.2.5 Welding circuit touch current
41 6.2.6 Touch current in normal condition
Figure 2 – Measurement of welding circuit touch current
Figure 3 – Measurement of touch current in normal condition
42 6.3 Protection against electric shock in case of a fault condition (indirect contact)
6.3.1 Protective provisions
6.3.2 Isolation between windings of the supply circuit and the welding circuit
6.3.3 Internal conductors and connections
Table 5 – Minimum distance through insulation
43 6.3.4 Additional requirements for plasma cutting systems
6.3.5 Movable coils and cores
6.3.6 Touch current in fault condition
44 7 Thermal requirements
7.1 Heating test
7.1.1 Test conditions
7.1.2 Tolerances of the test parameters
45 7.1.3 Duration of test
7.2 Temperature measurement
7.2.1 Measurement conditions
7.2.2 Surface temperature sensor
7.2.3 Resistance
46 7.2.4 Embedded temperature sensor
7.2.5 Determination of the ambient air temperature
7.2.6 Recording of temperatures
7.3 Limits of temperature rise
7.3.1 Windings, commutators and slip-rings
47 7.3.2 External surfaces
Table 6 – Temperature limits for windings, commutators and slip-rings
48 7.3.3 Other components
7.4 Loading test
Table 7 – Temperature limits for external surfaces
49 7.5 Commutators and slip-rings
8 Thermal protection
8.1 General requirements
8.2 Construction
8.3 Location
8.4 Operating capacity
50 8.5 Operation
8.6 Resetting
8.7 Indication
9 Abnormal operation
9.1 General requirements
51 9.2 Stalled fan test
9.3 Short circuit test
Table 8 – Cross-section of the output short-circuit conductor
52 9.4 Overload test
10 Connection to the supply network
10.1 Supply voltage
10.2 Multi-supply voltage
10.3 Means of connection to the supply circuit
53 10.4 Marking of terminals
10.5 Protective circuit
10.5.1 Continuity requirement
54 10.5.2 Type test
10.5.3 Routine test
Table 9 – Current and time requirements for protective circuits
Table 10 – Minimum cross-sectional area of the external protective copper conductor
55 10.6 Cable anchorage
Table 11 – Verification of continuity of the protective circuit
56 10.7 Inlet openings
10.8 Supply circuit on/off switching device
Table 12 – Pull
57 10.9 Supply cables
10.10 Supply coupling device (attachment plug)
58 11 Output
11.1 Rated no-load voltage
11.1.1 Rated no-load voltage for use in environments with increased risk of electric shock
11.1.2 Rated no-load voltage for use in environments without increased risk of electric shock
11.1.3 Rated no-load voltage for the use with mechanically held torches with increased protection for the operator
11.1.4 Rated no-load voltage for special processes for example plasma cutting
59 11.1.5 Additional requirements
Table 13 – Summary of allowable rated no-load voltages
60 11.1.6 Measuring circuits
Figure 4 – Measurement of r.m.s. values
Figure 5 – Measurement of peak values
61 11.2 Type test values of the conventional load voltage
11.2.1 Manual metal arc welding with covered electrodes
11.2.2 Tungsten inert gas
11.2.3 Metal inert/active gas and flux cored arc welding
11.2.4 Submerged arc welding
11.2.5 Plasma cutting
11.2.6 Plasma welding
11.2.7 Plasma gouging
11.2.8 Additional requirements
62 11.3 Mechanical switching devices used to adjust output
11.4 Welding circuit connections
11.4.1 Protection against unintentional contact
11.4.2 Location of coupling devices
11.4.3 Outlet openings
11.4.4 Three-phase multi-operator welding transformer
63 11.4.5 Marking
11.4.6 Connections for plasma cutting torches
11.5 Power supply to external devices connected to the welding circuit
11.6 Auxiliary power supply
64 11.7 Welding cables
12 Control circuits
12.1 General requirement
12.2 Isolation of control circuits
12.3 Working voltages of remote control circuits
65 13 Hazard reducing device
13.1 General requirements
13.2 Types of hazard reducing devices
13.2.1 Voltage reducing device
13.2.2 Switching device for AC to DC
13.3 Requirements for hazard reducing devices
13.3.1 Disabling the hazard reducing device
Table 14 – Hazard reducing device requirements
66 13.3.2 Interference with operation of a hazard reducing device
13.3.3 Indication of satisfactory operation
13.3.4 Fail to a safe condition
14 Mechanical provisions
14.1 General requirements
14.2 Enclosure
14.2.1 Enclosure materials
67 14.2.2 Enclosure strength
14.3 Handling means
14.3.1 Mechanised handling
14.3.2 Manual handling
68 14.4 Drop withstand
14.5 Tilting stability
15 Rating plate
15.1 General requirements
69 15.2 Description
Figure 6 – Principle of the rating plate
70 15.3 Contents
73 15.4 Tolerances
15.5 Direction of rotation
16 Adjustment of the output
16.1 Type of adjustment
74 16.2 Marking of the adjusting device
16.3 Indication of current or voltage control
75 17 Instructions and markings
17.1 Instructions
76 17.2 Markings
77 Annexes
Annex A (informative) Nominal voltages of supply networks
78 Annex B (informative) Example of a combined dielectric test
Figure B.1 – Combined high-voltage transformers
79 Annex C (normative) Unbalanced load in case of AC tungsten inert-gas welding power sources
C.1 General
C.2 Unbalanced load
Figure C.1 – Voltage and current during AC tungsten inert-gas welding
80 C.3 Example for an unbalanced load
Figure C.2 – Unbalanced voltage during AC tungsten inert-gas welding
Figure C.3 – AC welding power source with unbalanced load
81 Annex D (informative) Extrapolation of temperature to time of shutdown
82 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
83 E.3 Construction of the terminals
E.4 Fixing of the terminals
84 Annex F (informative) Cross-reference to non-SI units
Table F.1 – Cross-reference for mm2 to American wire gauge (AWG)
85 Annex G (informative) Suitability of supply network for the measurement of the true r.m.s. value of the supply current
86 Annex H (informative) Plotting of static characteristics
H.1 General
H.2 Method
H.3 Analysis of the results
87 Annex I (normative) Test methods for a 10 Nm impact
I.1 Pendulum impact hammer
Figure I.1 – Test set-up
Table I.1 – Angle of rotation θ to obtain 10 Nm impact
88 I.2 Free fall spherical steel weight
Table I.2 – Mass of the free fall weight and height of the free fall
89 Annex J (normative) Thickness of sheet metal for enclosures
90 Table J.1 – Minimum thickness of sheet metal for steel enclosures
91 Table J.2 – Minimum thickness of sheet metal for enclosures of aluminium, brass or copper
92 Annex K (informative) Examples of rating plates
Figure K.1 – Single-phase transformer
93 Figure K.2 – Three-phase rotating frequency converter
94 Figure K.3 – Subdivided rating plate: single-/three-phase transformer rectifier
95 Figure K.4 – Engine-generator-rectifier
96 Figure K.5 – Single-/three-phase inverter type
97 Figure K.6 – Battery powered welding power source with integral battery
98 Figure K.7 – Battery powered welding power source with detachable / separable battery
99 Annex L (informative) Graphical symbols for arc welding equipment
L.1 General
L.2 Use of symbols
L.2.1 General
L.2.2 Selection of symbols
L.2.3 Size of symbols
L.2.4 Use of colour
100 L.3 Symbols
L.3.1 General
L.3.2 Letter symbols
Table L.1 – Letters used as symbols
101 L.3.3 Graphical symbols
121 L.4 Examples of combinations of symbols
123 L.5 Examples of control panels
124 Figure L.2 – Arc force control potentiometer
Figure L.1 – Input voltage power switch
Figure L.3 – Remote receptacle and selector switches
Figure L.4 – Terminals with inductance selector for MIG/MAG welding
125 Figure L.6 – Selector switch on AC/DC equipment
Figure L.5 – Process switch (MMA, TIG, MIG)
Figure L.7 – Panel indicator lights (overheat, fault, arc striking, output voltage)
Figure L.8 – Setting pulsing parameters using digital display
126 Annex M (informative) Efficiency and idle state power measurement
M.1 Measuring efficiency
M.2 Measuring idle state power
128 Annex N (normative) Touch current measurement in fault condition
Figure N.1 – Measuring network for weighted touch current
130 Figure N.2 – Diagram for touch current measurement on fault condition at operating temperature for single-phase connection of appliances other than those of class II
132 Figure N.3 – Diagram for touch current measurement on fault condition for three-phase four-wire system connection of appliances other than those of class II
133 Annex O (normative) Battery-powered welding power sources
O.1 General
134 O.4 Environmental conditions
O.5 Tests
O.5.1 Test conditions
135 O.5.3 Conformity of components
136 O.6 Protection against electric shock
O.6.1 Insulation
O.6.1.1 General
O.6.1.4 Insulation resistance
137 O.6.1.5 Dielectric strength
O.6.2 Protection against electric shock in normal service
138 O.7 Thermal requirements
O.7.1 Heating test
O.7.1.1 Test conditions
139 O.7.1.3 Duration of test
O.7.2 Temperature measurement
O.7.2.1 Measurement conditions
O.7.4 Loading test
O.7.201 Normal charging of lithium-ion systems
140 O.8 Thermal protection
O.8.1 General requirements
O.8.4 Operating capacity
O.9 Abnormal operation
O.9.1 General requirements
141 O.9.2 Stalled fan test
O.9.3 Short circuit test
O.9.4 Overload test
O.9.201 Welding power source – abnormal conditions
142 O.9.202 Welding circuit components – abnormal conditions
O.9.203 Lithium-ion charging systems − abnormal conditions
143 O.9.204 Lithium-ion battery short circuit
144 O.9.205 Batteries other than lithium-ion – overcharging
O.9.206 Battery pack disconnection
O.9.207 General purpose batteries
O.10 Connection to the supply network
145 O.10.5 Protective circuit
O.10.8 Supply circuit on/off switching device
146 O.14 Mechanical provisions
O.14.1 General requirements
O.14.2 Enclosure
O.14.4 Drop withstand
147 O.15 Rating plate
O.15.3 Contents
149 O.17 Instructions and markings
O.17.1 Instructions
150 O.17.2 Markings
Figure O.1 – Marking of battery voltage class B electric components
151 Bibliography

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BS EN IEC 60974-1:2018
$256.21