1Kw single phase motor should be easy to start. 300microfard for that size of motor seems a bit odd (large) but so does using a 125VAC capacitor on a 240 volt system - even if it's in series with a winding.
To check out your problem of intermittent tripping (as against a constant fault) requires some real test equipment. As had been said earlier a megger is essential to check for earth leakage.
Do you have a circuit of the planer wiring.
Can you supply a photograph of the actual capacitor (with writing)
Is the planer motor an induction motor or a universal one (has brushes)
JW2 I'd inadvertently used 330 in my calculation rather than 300, hence 9.6 vs the correct 10.6
To check out your problem of intermittent tripping (as against a constant fault) requires some real test equipment. As had been said earlier a megger is essential to check for earth leakage.
Do you have a circuit of the planer wiring.
Can you supply a photograph of the actual capacitor (with writing)
Is the planer motor an induction motor or a universal one (has brushes)
JW2 I'd inadvertently used 330 in my calculation rather than 300, hence 9.6 vs the correct 10.6