The utility model relates to a terminal station and an electrical device system connected with the terminal station. In order to prevent heat and other bad conditions in the terminal station along with bad connection of a cable terminal in wiring operation, an operator can only cognize the insufficiency of the connection torque of a connection screw which connects the cable terminal to the terminal station. According to the utility model, a limit component is configured between the cable terminal and the connection screw; a part, which fixes the cable terminal, of the limit component becomes a concave curve face; under the condition that the connection torque of the connection screw reaches a given value, an open end of a driven piece of the limit component falls down near a rocking fulcrum of an outer cover to close the outer cover; and under the condition that the connection torque of the connection screw does not reach the given value, the open end of the driven piece of the limit component presses the back of the outer cover, and carries out stressing in the direction of preventing the outer cover from being closed, thus the insufficiency of the connection torque of the connection screw can be cognized.