A board apparatus including a printed circuit board, an electromagnetic compatibility, EMC, filter disposed on the printed circuit board and configured to filter EMC, and an inverter disposed on the printed circuit board and configured to supply a three-phase alternating current signal to a motor, the board apparatus comprising: a first ground wiring disposed on one surface of the printed circuit board and connecting between the EMC filter and a first ground supply; a second ground wiring disposed on the other surface of the printed circuit board and connecting to a second ground supply; a third ground wiring disposed on the one surface of the printed circuit board, connected to the inverter, and connected to the second ground wiring through a contact hole which penetrates through the printed circuit board; and a switch module configured to selectively interrupt a connection between the first ground wiring and the second ground wiring, wherein the switch module is disposed in an overlapped region between the first ground wiring and the second ground wiring, and includes a bolt which penetrates through the printed circuit board, and a nut which is in contact with the second ground wiring and is coupled to a screw of the bolt, wherein each of the bolt and the nut is formed of a conductive material, wherein the switch module further includes an insulating hole disposed between the screw of the bolt and the printed circuit board, wherein when the switch module includes an insulating member, the switch module is configured to interrupt the connection between the first and second ground wirings (111, 121), wherein when the switch module includes the insulating member, the insulating member is disposed between a head of the bolt and the first ground wiring and is configured to insulate between the bolt and the first ground wiring, and wherein when the switch module does not include the insulating member, the switch module is configured to connect between the first and second ground wirings (111, 121). a first ground wiring disposed on one surface of the printed circuit board and connecting between the EMC filter and a first ground supply; a second ground wiring disposed on the other surface of the printed circuit board and connecting to a second ground supply; a third ground wiring disposed on the one surface of the printed circuit board, connected to the inverter, and connected to the second ground wiring through a contact hole which penetrates through the printed circuit board; and a switch module configured to selectively interrupt a connection between the first ground wiring and the second ground wiring, wherein the switch module is disposed in an overlapped region between the first ground wiring and the second ground wiring, and includes a bolt which penetrates through the printed circuit board, and a nut which is in contact with the second ground wiring and is coupled to a screw of the bolt, wherein each of the bolt and the nut is formed of a conductive material, wherein the switch module further includes an insulating hole disposed between the screw of the bolt and the printed circuit board, wherein when the switch module includes an insulating member, the switch module is configured to interrupt the connection between the first and second ground wirings (111, 121), wherein when the switch module includes the insulating member, the insulating member is disposed between a head of the bolt and the first ground wiring and is configured to insulate between the bolt and the first ground wiring, and wherein when the switch module does not include the insulating member, the switch module is configured to connect between the first and second ground wirings (111, 121).