Li: contact for a period of a predetermined period of time, if the insulation is good enough, the above voltage is applied to only a small leakage current to produce a higher than normal operating voltage is applied to the shielding line, and. If the leakage current of the shielded wire is held within a predetermined range, the shielded wire by detecting the alarm bell no response, on the contrary, will not pass, the warning light flashes rings, without ringing the alarm by flashing lights at a predetermined time
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