Metal shells are mounted on a connector housing, and a screw engagement hole is formed through a grounding flange portion of the metal shell mated with a mounting flange of the connector housing, and a screw for fastening the mounting flange to a mounting wall of an equipment is passed through the screw engagement hole. A semiconductor substrate is provided, and a conductive node is formed to be supported by the semiconductor substrate. The hydrocarbon fraction may be optionally washed with water. The cargo well further comprises a metal plate extending between and fixably attached to the web portion of the first I-beam and the web portion of said second I-beam. A switch 18 is provided between the first battery 4 and the second battery 6 and control means 20 is arranged to open the switch 18 only when the vehicle is in the OFF state. Based on the weighted short-term indicator, a communication channel is selected as the communication channel for the communication request.