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 (AC) 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 (GND1); a second ground wiring disposed on the other surface of the printed circuit board and connecting to a second ground supply (GND2); 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 (CT) 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 , 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 . a first ground wiring disposed on one surface of the printed circuit board and connecting between the EMC filter and a first ground supply (GND1); a second ground wiring disposed on the other surface of the printed circuit board and connecting to a second ground supply (GND2); 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 (CT) 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 , 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 . <EOS>