请教保护阻抗电量的测试方法

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8.1.4 An accessible part is not considered to be live if
– the part is supplied at safety extra-low voltage, provided that
? for a.c., the peak value of the voltage does not exceed 42,4 V,
? for d.c., the voltage does not exceed 42,4 V,
or
– the part is separated from live parts by protective impedance.
– for voltages having a peak value over 15 kV, the energy in the discharge shall not
exceed 350 mJ
请教各位大侠，这里的保护阻抗的放电量是怎么测的？