external cameras: A point connected to the electric power system of the station. The connection thereof shall be integrated in a junction box (IP66) along with the requested protection (overcurrent protection, overvoltage and lightning). The transceiver connections F.O. They must also be located in this box. All connections made therein, be connected to the grid grounding resistance with exothermic welding, all points listed above, should be at a suitable height for maintenance