BS EN 60974-1:2012
$215.11
Arc welding equipment – Welding power sources
| Published By | Publication Date | Number of Pages |
| BSI | 2012 | 116 |
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, or driven by mechanical means.
This part of IEC 60974 specifies safety and performance requirements of welding power sources and plasma cutting systems.
This part of IEC 60974 is not applicable to welding power sources for manual metal arc welding with limited duty operation which are designed mainly for use by laymen and designed in accordance with IEC 60974-6.
This part of IEC 60974 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 part of IEC 60974 does not include electromagnetic compatibility (EMC) requirements.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 8 | English CONTENTS |
| 13 | 1 Scope 2 Normative references |
| 14 | 3 Terms and definitions |
| 22 | 4 Environmental conditions |
| 23 | 5 Tests 5.1 Test conditions 5.2 Measuring instruments 5.3 Conformity of components |
| 24 | 5.4 Type tests 5.5 Routine tests |
| 25 | 6 Protection against electric shock 6.1 Insulation 6.1.1 General Figures Figure 1 – Example of insulation configuration for Class I equipment |
| 26 | 6.1.2 Clearances Tables Table 1 – Minimum clearances for overvoltage category III |
| 27 | 6.1.3 Creepage distances |
| 28 | Table 2 – Minimum creepage distances |
| 29 | 6.1.4 Insulation resistance 6.1.5 Dielectric strength Table 3 – Insulation resistance Table 4 – Dielectric test voltages |
| 30 | 6.2 Protection against electric shock in normal service (direct contact) 6.2.1 Protection provided by the enclosure |
| 31 | 6.2.2 Capacitors 6.2.3 Automatic discharge of supply circuit capacitors |
| 32 | 6.2.4 Isolation of the welding circuit 6.2.5 Welding circuit touch current Figure 2 – Measurement of welding circuit touch current |
| 33 | 6.2.6 Touch current in normal condition 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 |
| 34 | 6.3.4 Additional requirements for plasma cutting systems 6.3.5 Movable coils and cores |
| 35 | 6.3.6 Touch current in fault condition 7 Thermal requirements 7.1 Heating test 7.1.1 Test conditions |
| 36 | 7.1.2 Tolerances of the test parameters 7.1.3 Duration of test 7.2 Temperature measurement 7.2.1 Measurement conditions 7.2.2 Surface temperature sensor |
| 37 | 7.2.3 Resistance 7.2.4 Embedded temperature sensor 7.2.5 Determination of the ambient air temperature 7.2.6 Recording of temperatures |
| 38 | 7.3 Limits of temperature rise 7.3.1 Windings, commutators and slip-rings 7.3.2 External surfaces Table 6 – Temperature limits for windings, commutators and slip-rings |
| 39 | 7.3.3 Other components 7.4 Loading test Table 7 – Temperature limits for external surfaces |
| 40 | 7.5 Commutators and slip-rings 8 Thermal protection 8.1 General requirements 8.2 Construction 8.3 Location 8.4 Operating capacity |
| 41 | 8.5 Operation 8.6 Resetting 8.7 Indication 9 Abnormal operation 9.1 General requirements |
| 42 | 9.2 Stalled fan test 9.3 Short circuit test 9.4 Overload test Table 8 – Cross-section of the output short-circuit conductor |
| 43 | 10 Connection to the supply network 10.1 Supply voltage 10.2 Multi-supply voltage 10.3 Means of connection to the supply circuit |
| 44 | 10.4 Marking of terminals 10.5 Protective circuit 10.5.1 Continuity requirement |
| 45 | 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 |
| 46 | 10.6 Cable anchorage Table 11 – Verification of continuity of the protective circuit |
| 47 | 10.7 Inlet openings 10.8 Supply circuit on/off switching device Table 12 – Pull |
| 48 | 10.9 Supply cables 10.10 Supply coupling device (attachment plug) |
| 49 | 11 Output 11.1 Rated no-load voltage 11.1.1 Rated no-load voltage for use in environments with increased riskof electric shock 11.1.2 Rated no-load voltage for use in environments without increased riskof 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 |
| 50 | 11.1.5 Additional requirements Table 13 – Summary of allowable rated no-load voltages |
| 51 | 11.1.6 Measuring circuits Figure 3 – Measurement of r.m.s. values Figure 4 – Measurement of peak values |
| 52 | 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 11.3 Mechanical switching devices used to adjust output |
| 53 | 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 11.4.5 Marking |
| 54 | 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 |
| 55 | 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 13 Hazard reducing device 13.1 General requirements |
| 56 | 13.2 Types of hazard reducing devices 13.2.1 Voltage reducing device 13.2.2 Switching device for a.c. to d.c. 13.3 Requirements for hazard reducing devices 13.3.1 Disabling the hazard reducing device 13.3.2 Interference with operation of a hazard reducing device Table 14 – Hazard reducing device requirements |
| 57 | 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 14.2.2 Enclosure strength |
| 58 | 14.3 Handling means 14.3.1 Mechanised handling 14.3.2 Manual handling |
| 59 | 14.4 Drop withstand 14.5 Tilting stability 15 Rating plate 15.1 General requirements 15.2 Description |
| 60 | 15.3 Contents Figure 5 – Principle of the rating plate |
| 63 | 15.4 Tolerances |
| 64 | 15.5 Direction of rotation 16 Adjustment of the output 16.1 Type of adjustment 16.2 Marking of the adjusting device 16.3 Indication of current or voltage control |
| 65 | 17 Instructions and markings 17.1 Instructions |
| 66 | 17.2 Markings |
| 67 | Annex A (informative) Nominal voltages of supply networks |
| 68 | Annex B (informative) Example of a combined dielectric test Figure B.1 – Combined high-voltage transformers |
| 69 | Annex C (normative) Unbalanced load in case of a.c. tungsten inert-gas welding power sources Figure C.1 – Voltage and current during a.c. tungsten inert-gas welding |
| 70 | Figure C.2 – Unbalanced voltage during a.c. tungsten inert-gas welding Figure C.3 – AC welding power source with unbalanced load |
| 71 | Annex D (informative) Extrapolation of temperature to time of shutdown |
| 72 | Annex E (normative) Construction of supply circuit terminals Table E.1 – Range of conductor dimensions to be accepted by the supply circuit terminals |
| 74 | Annex F (informative) Cross-reference to non-SI units Table F.1 – Cross-reference for mm2 to American wire gauge (AWG) |
| 75 | Annex G (informative) Suitability of supply network for the measurement of the true r.m.s. value of the supply current |
| 76 | Annex H (informative) Plotting of static characteristics |
| 77 | Annex I (normative) Test methods for a 10 Nm impact Figure I.1 – Test set-up Table I.1 – Angle of rotation θ to obtain 10 Nm impact Table I.2 – Mass of the free fall weight and height of the free fall |
| 78 | Annex J (normative) Thickness of sheet metal for enclosures Table J.1 – Minimum thickness of sheet metal for steel enclosures |
| 79 | Table J.2 – Minimum thickness of sheet metal for enclosures of aluminium, brass or copper |
| 80 | Annex K (informative) Examples of rating plates Figure K.1 – Single-phase transformer |
| 83 | Figure K.4 – Engine-generator-rectifier |
| 85 | Annex L (informative) Graphical symbols for arc welding equipment |
| 86 | Table L.1 – Letters used as symbols |
| 105 | Figure L.1 – Input voltage power switch Figure L.2 – Arc force control potentiometer |
| 106 | Figure L.3 – Remote receptacle and selector switches 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 |
| 107 | Figure L.7 – Panel indicator lights (overheat, fault, arc striking, output voltage) Figure L.8 – Setting pulsing parameters using digital display |
| 108 | Annex M (informative) Efficiency |
| 109 | Annex N (normative) Touch current measurement in fault condition Figure N.1 – Measuring network for weighted touch current |
| 111 | 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 |
| 112 | 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 |
