Edw1n
Electrical
- Oct 5, 2006
- 15
We are doing replacement of 4 wire,415V rated overhead distribution pole. We are required to do the loop impedance test before energizing the line and was told by the utility that acceptable reading of 0.4 ohms (L-N)and report should it exceed this reading.
Can anyone tell me why is the maximum acceptable reading set at 0.4 ohms for the overhead line while for underground cable is 0.2 ohms
Can anyone tell me why is the maximum acceptable reading set at 0.4 ohms for the overhead line while for underground cable is 0.2 ohms