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Hi, just registered, I qualified in 1973 and and not done much electical work for the past 30 odd years but I obviously have grasp of the theory.

I have an intermittent mcb tripping on my electric gate, which I installed. (All electric no hydraulics)
The mcb will trip in any weather conditions and can go days or weeks without tripping.
Sometimes it is the ocassional trip out, sometimes it is regular over a period of days then it might go a few days or a week before it happens again.
It happens when the gate is at rest and it has not happened when it is opening or closing but I think this is just coincidence and it could happen.
The gate was installed about 5 years ago and has worked ok up til now.

I have changed the mcb. There is no RCD. ( bad idea I know I will install one when Ive fixed this problem) The gate is 230v the breaker is 15amp. The safety circuits are 24vac I have changed the 230/24v transformer. The gate draws 0.03 amps at rest.
I have connected a temporary supply cable via an outside socket and this makes no difference.
I have tried disconnecting the earth and this makes no difference. But I wonder if it could still be an earth fault via the motor housing which is metal and is welded to a 20ft RSJ girder which is sunk in the ground, but then again how could it be, I have tried disconnecting the earth at both the motor end and the consumer unit. I do not have anything to test with except a multimeter.

Any advice gratefully recieved - thanks - mick
 
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