矿井应有两回路电源线路,两回路电源线路上都不得分接任何负荷。正常...
Wednesday, September 14, 2022
本质安全型电气设备的标准编号为GB3836·4-2000,标志为“I”。...
Monday, November 21, 2022
Wednesday, September 6, 2023
Wednesday, September 14, 2022
Sunday, September 11, 2022
产生的机械伤痕,宽度与深度不大于0.5毫米;其长度应保证剩余无伤痕隔爆面有效长度小于规定长度的()。A、1/3B、1/2C、2/3...
Wednesday, July 19, 2023
用非金属材料外壳或非金属外壳部件制造的防爆电气,其非金属材料必须...
Wednesday, September 14, 2022
Sunday, September 11, 2022
Sunday, November 5, 2023
电缆主芯线截面可以依照()原则进行选择或验算。A、长时允许负荷电流B、允许电压损失C、机械强度要求D、阻燃E、电缆末端最小两相短路电流应大于馈电开关整定电流值...
Sunday, December 3, 2023
抽放瓦斯地面泵房和泵房周围25m范围内,禁止堆积易燃物和有明火。...
Sunday, September 11, 2022
Tuesday, April 9, 2024
Thursday, October 5, 2023
Thursday, March 2, 2023
对于管状局部接地极,必须垂直打入地中,埋入地中的长度及外露的部分长度应分别为()。A、1.5m;100mmB、1m;300mmC、1.2m;250mm...
Wednesday, April 10, 2024
Sunday, September 11, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
Wednesday, September 14, 2022
安装电缆时,其护套要伸入盒壁()mm,并用防止电缆拨脱装置压紧电...
Sunday, September 11, 2022