Discuss Weird RCD Issue... in the Electrical Forum area at ElectriciansForums.net

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We have a race trailer in which runs off both single phase and 3 phase.
A contactor for each, which activates when plugged in, with the single phase all phases linked.

The DB has a 100ma upfront RCD incomer, then 30ma Europa RCBO's.
In 99% of scenarios there will also be a 30ma RCD on the supply to the trailer, as this is what most track side supplies have, or off generator. So there is no selectivity, but this is normal for this industry.

All works perfectly fine on 3 phase.

However on single phase it will trip the rcd in the workshop on startup.
However if i leave 2 B20 RCBO's turned off, all works fine.

Have tested all final circuits, all good.

I have also tried swapping circuits around, by putting different circuits onto these 2 rcbo's, and it is still these 2 RCBO's that trip! If there is no loading on these 2 all starts up fine.

So the problem seems to be linked to these 2 RCBO's when loaded on startup.



Is it possible for there to be a fault with these 2 RCBO's that is leaking current to earth (they have earth leads), or some imbalance?

But then why are they fine on 3 phase.... (the 3 phase in workshop has 30ma RCD).


Can anyone think of anything?, as its driving me nuts trying to diagnose!
 
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marconi

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