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Note that references are to IEC 60950 Third Edition 1999-04. Where the references in the Second Edition differ, they appear in parentheses.

Equipment shall provide adequate electrical insulation between a TNV-1 circuit or a TNV-3 circuit and parts of the equipment which are accessible or connected to other equipment.

1) An electric strength test at either 1.5 kV AC or 1.0 kV AC, the former voltage being for earthed conductive parts or nonconductive parts, the latter voltage being for circuitry.

2) An impulse test at either 2.5 kV or 1.5 kV, the former voltage being for earthed conductive parts or nonconductive parts, the latter voltage being for circuitry. The impulse definition is given in Annex N of the standard. The waveform is 10/700 µs (10 µs virtual front time, 700 µs virtual time to half value). The separation is subject to 10 impulses of alternating polarity with 60 seconds between pulses.

As a result of either of these tests, there shall be no breakdown of insulation.

For Australia, both these tests must be carried out. The test voltages used for both the electric strength test and the impulse test are higher than for those given in IEC 60950.