Electronics > Beginners
Earth leakage fault - consider using an whole lab insolation traffo - discuss
MadScientist:
Thanks so far guys , some stuff here to chew on , the idea of adding individual Rcbos to the rings is a good one , but some to ensure diversity in the Rcbos is an issue
rhb:
I had a similar problem which I ultimately traced to a buried wire feeding a yard light. It was *very* time consuming to sort out. The wire was proper wire for direct burial. If you suspect a particular circuit, patch in a ground fault interrupter on that circuit alone. Stick it in a handy box with enough wire so you can easily connect it up to the appropriate circuit and mount it on the wall next to the panel. Do a neat job so the wires from the handy box go into the wall and through a panel knockout in proper fashion.
I'm assuming you are experienced and comfortable working with mains wiring and understand about cable clamps, insulating bushes and such. If not, please disregard.
MadScientist:
--- Quote from: rhb on November 23, 2018, 02:48:53 pm ---I had a similar problem which I ultimately traced to a buried wire feeding a yard light. It was *very* time consuming to sort out. The wire was proper wire for direct burial. If you suspect a particular circuit, patch in a ground fault interrupter on that circuit alone. Stick it in a handy box with enough wire so you can easily connect it up to the appropriate circuit and mount it on the wall next to the panel. Do a neat job so the wires from the handy box go into the wall and through a panel knockout in proper fashion.
I'm assuming you are experienced and comfortable working with mains wiring and understand about cable clamps, insulating bushes and such. If not, please disregard.
--- End quote ---
Yes very comfortable woth mains wiring
The problem with series RCBO is that you can’t be sure if the “test “ RCBO will trip instead of the House one
jpb:
I had this fault on my present house. When we moved in we kept having the mains trip.
I found that this was because they had not changed the consumer box when they put a new kitchen in and so everything was going through 1 rcd. All electrical tests seemed fine but every few days the mains would trip.
I had the box changed for one with a separate rcd on each circuit and not had a problem since.
The issue is modern appliances often contain filters with capacitance to ground and the cumulative ground current is enough to exceed the 25mA limit or be very close to it. Very hard to trace because it is a different thing each time that causes the trip and it happens at random times.
HB9EVI:
When I reconstructed our mains from the 70' here in the house, I first planned separate RCDs for each kitchen, washmachine and lighting, but in the end I installed a single three phase 30mA model for all circuits and I had no issues, though there are likely many devices with potential ground leakage over Y-caps.
So before setting up an isolation, I'd rather change the tripping RCD first
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