The engine block must be connected to the airframe using a properly sized ground strapfor carrying the starter current and to avoid static electricity between the engine and theairframe.The minimum cable cross-section for the line from the battery to the starter relay and fromthere to the electric starter and for the ground line (start system) depends on the cablelength “I“(= Sum of the supply line and ground line of the electric starter) and has to be calculated according to the following table.