施工现场用电工程中,PE线上每处重复接地的接地电阻值不应大于()。
A.40Ω
B.10Ω
C.300Ω
D.100Ω
参考答案:B
A.1OmA
B.20mA
C.30mA
D.不大于30mA
A.15mA
B.不大于15mA
C.30mA
D.不大于30mA
A.48V
B.36V
C.4V
D.12V
一般场所必须使用额定漏电动作电流不大于(),额定漏电动作时间应不大于()的漏电保护器。
A.30mA
B.50mA
C.0.1S
D.0.2S
正常条件下,开关箱内漏电保护器额定漏电动作电流及漏电动作时间为:()。
A.30mA,0.01S
B.50mA,0.1S
C.30mA,0.1S
D.50mA,0.01S