This is a new drive model Q9440IER3 toshiba. The customer reports it trips out on ground fault though i have never seen it do it. All the line side and load side wiring has been meggered and is good. The job is two hours away and it is getting frustrating. The drive tech has been of little help but says the problem is not in the drive and that it is a wiring problem. I have double checked wiring and the only thing weird I can find is the ground wire going from the out door disconect at the cooling tower to the motor when isolated from the disconect reads 3000 ohms to the conduit and tower its self. The conduit is isolated at the peker head by a rubber gasket thus causing the resistance. the motor also has some resistance to the tower frame due to the paint on the base. However the ground wire coming from the drive to the out door disconect reads zero ohms to the conduit as you would expect. So when you junction the two together in the disconect the motor now has zero resistance to ground. I think I am barking up the wrong tree but am running out of ideas. Any ideas would be appreciated.