請問他線點他有無落地?

你個人頭就落地,都唔知你問乜

2006-10-15 13:12:59 補充：
唔好唔記得邊個發問,發問個個識咩?你有咩資格話我唔識呀?

要進行絕緣測試用Mega錶去量度,用500V檔位去量度,量度出來的oms數要大過0.5歐姆,正常的電路應會是相對地,相對相,相對中性線量度出來的oms數都是無限大,因差正常會唔通,ok?

絕緣測試
1) 先拆除接線!
2) 用咪架錶他三相對地!

第一: 你最好沿住條線睇吓條地線有冇接去個Earthing Conductor.（掣房的銅板）

第二: 你要量度的是地線中間是否打開或者接點是否妥當, 你就用個Ohm Meter 量度，　如果不能一次過由Earthing Conductor度至你想度的地方, 你可以一段一段的度．

以上兩部可確定由某點至Earthing Conductor 是否安裝好，　至於由Earthing Conductor及Earthing Electrode,你就要用三針的Resistance Tester來度勒．

唔使理個............傻仔

可以用 咪 架 錶 用1000v他線
記得不要接用電器

2006-10-15 14:35:59 補充：
要高過1Mohm

1. use the megger tester (insulation tester). the probe connect against test core and common round ( earth wire or connected metal part). Inject 500 or 1000V by insulation tester, check the reading..
If reading is 0 M-ohm. Mean..the conductor is shock to ground.
If reading appear 1 M-ohm; mean the conductor have 1,000,000 ohm resistance between conductor to ground. The current leakage is less, general result is passed under government cable insulation test min. requirement.

2. if Switchboard..the method is similar..
3. HV cable, the tester voltage up to 10,000V and insulation at least 1G-ohm.

Note: do not forget core to core test due the full set cable testing.

2006-10-15 02:56:13 補充：
1. use the megger tester (insulation tester). the probe connect against test core and common gound ( earth wire or connected metal part). Inject 500 or 1000V by insulation tester, check the reading.. common ground