The "Static GroundingMonitoring System" functions as a part of an Overfill Protection &Earthing System. These provide a visual green light indicating a confirmedgrounding condition of road tanker vehicles during the transfer of flammableand combustible materials. A red light indicates the absence of dependablegrounding. An interlock circuit inside the control panel will prevent pumps andequipment from starting until a satisfactory ground is established. Theinterlock circuit will also shut off pumps and equipment if the ground is lostduring the pumping operation.