A voltage verification unit and method for determining the absence of potentially dangerous potentials within a power supply enclosure without Mode 2 work is disclosed. The plurality of operating modes include: a first auto stop mode where a motor rotates only for a first time period after an impacting operation is detected; and a second auto stop mode where the motor rotates only for a second time period which is shorter than the first time period after the impacting operation is detected. The microcontroller controls the illumination of dedicated LEDs to indicate the status of each of the strobe lamps. The fluid circulates in layer in order to limit the pressure drops generated by the flow. The windshield glass anchor includes a windshield glass clamp and a pivot extension. The displacement of the lights on plates is directly monitored to determine a 3D displacement vector that represents a relative displacement between the first entity and the second entity.