This part of IEC 60974 specifies test procedures for periodic inspection and, after repair, to ensure electrical safety. These test procedures are also applicable for maintenance. This standard is applicable to power sources for arc welding and allied processes designed in accordance with IEC 60974-1 or IEC 60974-6. Stand-alone ancillary equipment designed in accordance with other part of IEC 60974 may be tested in accordance with relevant requirement of this part of IEC 60974. NOTE 1 The welding power source may be tested with any ancillary equipment fitted that could affect the test results. This standard is not applicable to testing of new power sources or engine-driven power sources. NOTE 2 For a power source not built in accordance with IEC 60974-1, see Annex C.