BS EN 60974-4:2007

This part of BS EN 60974 specifies test procedures for in-service inspection and, after repair, to ensure electrical safety. These test procedures are also applicable for maintenance.

This standard is applicable to power sources together with ancillary equipment for arc welding, cutting and allied processes built in conformity with IEC 60974-1.

This standard is not applicable to testing of new power sources or engine-driven power sources.

• Normative references
• Terms and definitions
• General requirements
• Qualification of test personnel
• Test conditions
• Measuring instruments
• Periodic inspection and test
• Maintenance
• Repair
• Test sequence
• Protection against electrical shock
• Visual inspection
• Continuity of the protective circuit
• Insulation resistance
• Welding circuit leakage current
• Primary leakage current
• No-load voltage (U0)
• Functional test
• Function
• Supply-circuit on/off switching device
• Voltage-reducing device
• Magnetic gas valve
• Signal and control lamps
• Documentation
• Test report
• Labelling
• Check-list for the visual inspection
• Example of a test report after repair
• Equipment not built in accordance with IEC 60974-1
• Normative references to international publications with their corresponding European publications

• Measurement of leakage current of welding circuit
• Measuring network for primary leakage current
• Principles of primary leakage current measurement for single phase equipment
• Measurement of peak values
• Test sequence on used arc welding equipment
• Insulation resistance