Abstract: A safety lock-out grounding device renders each of the phase leads of single phased or multi-phased electrical equipment to a grounded, safe condition to facilitate safe servicing or repair. The device has sheathed flexible phase leads and a sheathed ground conductor each being provided with an adjustable toggle actuated clamping device to establish positive clamping with the phase leads of the electrical equipment and positive clamping with a ground buss. Each of the clamping devices has relatively moveable locking components that define lock openings which become aligned when the respective adjustable toggle actuated clamping device is clamped onto a phase lead or ground buss.