为防止早爆事故,当杂散电流强度超过( )时,采用电力起爆。A.20mA B.30mA C.40mA D.50mA

作者: tihaiku 人气: - 评论: 0
问题 为防止早爆事故,当杂散电流强度超过( )时,采用电力起爆。
选项 A.20mA B.30mA C.40mA D.50mA
答案 B
解析 为防止早爆事故,当杂散电流强度超过30mA时,应采用电力起爆,并采取如下安全措施:(1)降低牵引电网路电阻,防止漏电。(2)提高电爆网路的质量,爆破导线不准有裸露接头。(3)撤出爆区的金属物体,如风管、钢轨、水管。(4)在爆区局部或全部停电,减少杂散电流。(5)采用低电阻电雷管。当杂散电流超过50mA时,禁止采取电力起爆。

相关内容:早爆,事故,当杂,电流强度,电力,起爆,A.20mA,B.30mA,C.40mA,D.50mA

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