ok, iv a domestic house with a shed 50 mtrs away supplied via 3x10 SWA on a B32A MCB. fault has been occurring the last few days which is the MCB in house tripping.
I arrive and open both boards and remove both PE and N conductors from terminals followed by IR testing and was getting very poor results between all conductors, then just out of interest i powered back up with phase only and main switch in shed isolated plus PE and N still removed .
I was recording voltage of 230v from the disconnected PE to the MET at the house and 180v between the PE and N conductor supposedly dead legs therefore i was expecting a trip again when i connected back up all conductors but no , nothing happened.
I am pretty confidant that the SWA is damaged but why is it not tripping constantly, is it a high resistance fault thereby not enough fault current flowing.
I also carried out fault loop at the house and shed which were .15 ohms and .33ohms.
Looking forward to your opinion's.
I arrive and open both boards and remove both PE and N conductors from terminals followed by IR testing and was getting very poor results between all conductors, then just out of interest i powered back up with phase only and main switch in shed isolated plus PE and N still removed .
I was recording voltage of 230v from the disconnected PE to the MET at the house and 180v between the PE and N conductor supposedly dead legs therefore i was expecting a trip again when i connected back up all conductors but no , nothing happened.
I am pretty confidant that the SWA is damaged but why is it not tripping constantly, is it a high resistance fault thereby not enough fault current flowing.
I also carried out fault loop at the house and shed which were .15 ohms and .33ohms.
Looking forward to your opinion's.