The first class cable – suitable for one single –phase earthing – block time does not exceed one minute each time. Max. time not exceed 8 hours , and not exceed 125 hours in all in one year.
第一类——用于单相接地故障时间每一次一般不大于1min，亦可用于最长不超过8小时，每年累计不超过125小时的系统。
The first class cable – suitable for one single –phase earthing – block time does not exceed one minute each time. Max. time not exceed 8 hours , and not exceed 125 hours in all in one year.
第一类——用于单相接地故障时间每一次一般不大于1min，亦可用于最长不超过8小时，每年累计不超过125小时的系统。
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