A power tool comprising a housing; an electric motor mounted within the housing; an insulated electric wire electrically connected to the motor and which is capable of providing an electric current to the motor; an electric switch connected in series with the wire, the electrical switch comprising a body and at least one electrical terminal plate extending from the body, wherein an exposed end of the insulated electric wire is electrically connected to the end of the terminal plate, and the exposed end of the wire and the end of the terminal plate are enclosed within an insulating sleeve; and a resilient insulating tube mounted on and surrounding the terminal plate, the resilient insulating tube being positioned on the terminal plate between the insulating sleeve and the body of the switch to enclose the part of the terminal plate located between the body and the insulating sleeve.