Foreword
1 Scope
2 Normative references
3 Definitions
4 Environmental conditions
5 Test conditions
5.1 Type tests
5.2 Routine tests
6 Protection against electric shock
6.1 Insulation
6.1.1 Clearances
6.1.2 Creepage distances
6.1.3 Insulation resistance
6.1.4 Dielectric strength
6.2 Protection against electric shock in normal
service (direct contact)
6.2.1 Protection provided by the enclosure
6.2.2 Capacitors
6.2.3 Automatic discharge of input capacitors
6.3 Protection against electric shock in case of a
fault condition (indirect contact)
6.3.1 Isolation of the input circuit and the
welding circuit
6.3.2 Insulation between windings of the
input circuit and the welding circuit
6.3.3 Internal conductors and connections
6.3.4 Movable coils and cores
6.3.5 Additional requirements for plasma
cutting systems
7 Thermal requirements
7.1 Heating test
7.1.1 Tolerances of the test parameters
7.1.2 Duration of the heating test
7.2 Temperature measurement
7.2.1 Surface temperature sensor
7.2.2 Resistance
7.2.3 Embedded temperature sensor
7.2.4 Determination of the ambient air
temperature
7.2.5 Recording of temperatures
7.3 Limits of temperature rise
7.3.1 Windings, commutators and slip-rings
7.3.2 External surfaces
7.4 Loading test
7.5 Commutators and slip-rings
8 Abnormal operation
8.1 Stalled fan
8.2 Short-circuit
8.3 Overload
9 Thermal protection
9.1 Construction
9.2 Location
9.3 Operation
9.4 Resetting
9.5 Operating capacity
9.6 Indication
10 Connection to the input supply
10.1 Supply voltage
10.2 Power supply
10.3 Means of connection
10.4 Input supply terminals
10.4.1 Marking of terminals
10.4.2 Continuity of the protective circuit
10.5 Cable anchorage
10.6 Inlet openings
10.7 Input supply on/off switching device
10.8 Supply cables
10.9 Supply coupling device (attachment plug)
11 Output
11.1 Rated no-load voltage (U[0])
11.1.1 Rated no-load voltage for use in
environments with increased hazard of
electric shock
11.1.2 Rated no-load voltage for use in
environments without increased hazard
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 e.g. plasma cutting
11.2 Type test values for the conventional load
voltage
11.2.1 Manual metal arc welding with covered
electrodes
11.2.2 Tungsten inert gas and plasma arc
welding
11.2.3 Metal insert/active gas and
selfshielded flux cored arc welding
11.2.4 Submerged arc welding
11.2.5 Plasma cutting
11.2.6 Plasma gouging
11.3 Mechanical switching devices used to adjust
output
11.4 Output connections
11.4.1 Protection against unintentional contact
11.4.2 Location of socket outlets
11.4.3 Outlet openings
11.4.4 Three-phase a.c. multi-operator welding
transformer
11.4.5 Marking
11.4.6 Connections for plasma cutting torches
11.5 Power supply to external devices
11.6 Auxiliary power output
12 Control circuits
13 Hazard reducing device
13.1 Voltage reducing device
13.2 Switching device for a.c. to d.c.
13.3 Connection of a hazard reducing device
13.4 Interference with operation of a hazard reducing
device
13.5 Indication of satisfactory operation
13.6 Fail to a safe condition
14 Mechanical requirements
14.1 Enclosure
14.2 Impact resistance of handles, push buttons etc
14.3 Handling means
14.4 Drop withstand
14.5 Tilting stability
15 Rating plate
15.1 Description
15.2 Contents
15.3 Tolerances
15.4 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
17 Instructions and markings
17.1 Instructions
17.2 Markings
Annex A (informative) Nominal voltages of supply systems
Annex B (informative) Example of a combination dielectric
test
Annex C (normative) Unbalanced load in case of a.c. tungsten
inert-gas welding power sources
Annex D (informative) Extrapolation of temperature to time of
shutdown
Annex E (normative) Construction of input supply terminals
Annex F (informative) Cross-reference to non-SI units
Annex G (informative) Suitability of input supply for the
measurement of the true value of the
supply current
Annex H (informative) Plotting of static characteristics
Annex I (normative) Examples of a 10 Nm impact test
Annex J (normative) Thickness of sheet metal for
enclosures
Annex K (informative) Examples of rating plates
Annex L (informative) Graphical symbols for arc welding equipment
Figures
Tables