③ test conditions:<br>A. withstand voltage test after aging: put the sheath into the constant temperature bath for aging at 100 + / - 2 ℃ for 70 hours, and then measure the withstand voltage: AC 1850v,<br>Leakage current 10mA, power on time 1min<br>B. under normal temperature without any treatment, test withstand voltage: AC 2500V, leakage current 10mA, power on time 1min<br>
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