A lockout unit coupled to a gate to provide selective access to an electrical machine is provided. The lockout unit includes a stationary bracket, an arm, and a removable bracket. The stationary bracket includes a first aperture defined therein, and the arm includes a second aperture defined therein. The arm is selectively movable between an open position in which the arm is spaced from the stationary bracket, and a closed position in which the second aperture is substantially concentrically-aligned with the first aperture to receive a locking device therethrough. The removable bracket is selectively coupleable to the arm when the arm is in the closed position. The removable bracket includes a third aperture defined therein that is selectively aligned with one of the first aperture and the second aperture to receive the locking device therethrough when the removable bracket is coupled to the arm.