打耐压前是要断开保护阻抗的。
Protective impedance and radio interference filters are disconnected before carrying out the tests.
在进行试验前，保护阻抗要从带电部件上断开。
Protective impedance is disconnected from live parts before carrying out the tests.
应采用双重绝缘或加强绝缘将由保护阻抗连接的各个部件隔开。
Parts connected by protective impedance shall be separated by double insulation or reinforced insulation.
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