I have just purchased an ML7 with an English Electric one third Horsepower single phase motor on it. The problem is this. When starting there is a spark from within the motor. This sometimes causes the house RCD to trip. I have inspected the inertia switch within the motor, which is of a good robust construction, but is obviously the location of the spark. Its contacts are in good condition.
Is this a common problem? If so has anyone cured it with RC networks across the switch? Do I have to resort to an external relay operated from the inertia switch?
Regards Bernie