Problem is.. That once u turn the fan on from the speed controller it runs for 2hours or so and the trips the main electricity of the shop? I have called many electricians and even took it back to the fan specialists.. but no one can understand what the problem is.. It works for a bit then trips the mains.. and doesn't come back on..! The speed controller is perfect! And the wireing is all clear aswell.. had it all checked..! Could anyone help me please?