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Radio interference of RCD's?

alanblaby
I've got an ongoing problem with a randomly tripping RCD.

It started 3 months ago, lost power in the middle of the night. 3 circuits (sockets/cooker/shower) fed by the one RCD.

Initial thoughts were to faulty appliances. But, the trip has been random, apart from it is usually late at night/early morning.

The trip is usually sometime between midnight and 2am. It cannot be pinned down any closer as the flatowner is in bed!

Once reset, it stays on for a week or more.

So far: All fixed wiring has been tested, and all OK. RCD (old Crabtree, plug in type, 15-20yo) has been changed and

ramp/time tested, 27mA ramp, 18/43 time. Earth leakage with my basic meter gave a 6mA reading.

It went again last night after a month of non-tripping.

I think I've covered all bases, and will now be changing the CU for a metal clad all rcbo board.


So, what do you reckon? I'm stumped now, and thoughts have turned to radio interference causing the RCD to trip. 

It's a long shot, but I cant think of anything else that may cause it.

Any thoughts?
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    Or even if it is not, switching of other loads on the same substation causing neutral earth bounce.

    Problem is I suspect when ever you go to measure it the E-N voltage will be respectable.

    Such things have occasionally been harbingers of doom substation faults in the past.


    Unless something has changed radio wise recently, and you do not mention that, I'd put early hours RFI behind a neutral fault, either in the building or outside in the pecking order.
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    Or even if it is not, switching of other loads on the same substation causing neutral earth bounce.

    Problem is I suspect when ever you go to measure it the E-N voltage will be respectable.

    Such things have occasionally been harbingers of doom substation faults in the past.


    Unless something has changed radio wise recently, and you do not mention that, I'd put early hours RFI behind a neutral fault, either in the building or outside in the pecking order.
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