earth loop impedance above permissible value 接地环路阻抗超出容许数值。
earth loop impedance test 接地阻抗测试
earth lineloop impedance tester ( elt-s ) is used for loop impedance measurement of power socket outlet elt-s环路阻抗仪表专为测试插座的保护地线。
electrical safety in low voltage distribution systems up to 1000 v a . c . and 1500 v d . c . equipment for testing, measuring or monitoring of protective measures-loop impedance 不超过交流1000v和直流1500v的低压配电系统电气安全性.防护测试测量或监测设备.回路阻抗
electrical safety in low voltage distribution systems up to 1000 v a . c . and 1500 v d . c .-equipment for testing, measuring or monitoring of protective measures-part 3 : loop impedance 1000v交流和1500v直流的低压分配系统的电气安全.防护测量的试验测量和监测设备.第3部分:回线阻抗