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Swimming pool 3 phase motor trips occasionally on earth leakage RCD

CliveS
We have a new 4 kW 3 phase pump motor at the local pool which has a new variable speed drive unit attached and occasionally it trips out on the RCD which I assume is 30mAmp .  The connections are star inside the motor but not earthed which should have stopped it tripping.

We are not sure what to do, we could run the motor flat out and delta connect the windings possibly or some suggest disconnecting the RCD as the circuit is completely separate from normal wiring.  Would this option contravene any of our regs?
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    This directive is another instance of 0.5kW kettles to save energy. It will save nothing and may well cause increased consumption! Stupid. Is it worth a tiny saving of 2% in the motor efficiency rating, at the cost of at least a couple of hundred pounds for a VSD? It will probably never save that much!
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    This directive is another instance of 0.5kW kettles to save energy. It will save nothing and may well cause increased consumption! Stupid. Is it worth a tiny saving of 2% in the motor efficiency rating, at the cost of at least a couple of hundred pounds for a VSD? It will probably never save that much!
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