Recently I had an air handler shut down due to a wire rubbed where it goes into the motor. The wire rubbed and arced to ground where it went into the motor and the overload opened the circuit (this destroyed the overload, at 600 Volt!!!) The surprise to me was the fact that the wires are three hots and a bond tie wrapped to the frame of the air handler from the starter/overloads to the motor. Not teck or BX but just three hots and a bond. There are six other air handlers that are wired the same way. The motors have an anti short put into the motor where a connector would thread in. The air handlers are electically certified for Canada but this does not seem proper. Shouldn't these wire be ran in armour or sheathing with proper connectors or???? This particular motor that arced had no anti short installed.