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Hi everyone,
My two cents:
1. Once I had a 24 V earth fault. Reason found: due to vibration, a "+" cable from battery was slightly damaged and was in touch with ship's hull.
2. Another time it was a battery charger.
3. Then it was in a fire detection system.
I trace such faults beginning with turning off all circuits, one by one.
If no results, start disconnecting lines in 24V system and measure resistances.
The "Earth fault detection system" itself may cause problem as well or give a false indication.
If Your system includes a traffo 220/24 - rectifier, charger then problems may be there.
Just take Your time, trace it logically, excluding circuits step by step.
P.S. Could be great, if You post some scanned drwgs if possible.
rgds,
Andrei
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