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Discuss RCD tripping when switching oven isolator off in the Electrical Forum area at ElectriciansForums.net

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Hi all.
I was called to a house recently where the occupier reported that when they turned the oven isolator off the RCD would trip.
So I tried it and that's exactly what happened. There was nothing switched on on the oven at the time. When the oven is on it works fine.
It is an integrated oven on a dedicated 16 amp circuit. Circuit tested fine in all respects and a ramp test on RCD showed it tripping at 24 mA.
They have to turn the isolator off when not using the oven as they have a son with learning difficulties who sometimes turns the controls on the front of th oven.
Any ideas what the cause might be?
Thanks.
 
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