Hi all.
I'm getting abit confused. Help would be appreciated.
Was called to a customer who had lights dimming and kettle not working.
Arrived and found TT sytem with in line Voltage operated Earth Leakage device between cutout and fuse box.
The device was found to be faulty, large voltage drop reduced the supply voltage down to 120V so replaced this with a DB 100A isolation switch as a temporary measure, then to return with an 30mA RCD to offer earth faualt protection. Recommende a new 17th edit CU to comply but they weren't keen on the idea. So told em if RCD trips all circuits will become unoperational.
Tested RCD....just wouldnt trip. suspected a neutral to earth fault.
Removed all neutrals and found the lighting circuit to be culprit.
With a time limit of 1 hour to hunt down the cause......I figured not much hope.
Anyway Found that on removing the lighting circuit neutral the RCD tripped as the neutral was removed from the neutral bar.
On attempting to reset RCD it would not reset. But did reset once the neutral was replaced
Anyone know why please.
Thanks in anticipation
I'm getting abit confused. Help would be appreciated.
Was called to a customer who had lights dimming and kettle not working.
Arrived and found TT sytem with in line Voltage operated Earth Leakage device between cutout and fuse box.
The device was found to be faulty, large voltage drop reduced the supply voltage down to 120V so replaced this with a DB 100A isolation switch as a temporary measure, then to return with an 30mA RCD to offer earth faualt protection. Recommende a new 17th edit CU to comply but they weren't keen on the idea. So told em if RCD trips all circuits will become unoperational.
Tested RCD....just wouldnt trip. suspected a neutral to earth fault.
Removed all neutrals and found the lighting circuit to be culprit.
With a time limit of 1 hour to hunt down the cause......I figured not much hope.
Anyway Found that on removing the lighting circuit neutral the RCD tripped as the neutral was removed from the neutral bar.
On attempting to reset RCD it would not reset. But did reset once the neutral was replaced
Anyone know why please.
Thanks in anticipation