This part of IEC 60060 is applicable to: - dielectric tests with direct voltage; - dielectric tests with alternating voltage; - dielectric tests with impulse voltage; - dielectric tests with combinations of the above. This part is applicable to tests on equipment having its highest voltage for equipment Um above 1 kV. NOTE 1 Aternative test procedures may be required to obtain reproducible and significant results. The choice of a suitable test procedure should be made by the relevant Technical Committee. NOTE 2 For voltages Um above 800 kV meeting some specified procedures, tolerances and uncertainties may not be achievable.