NET WIRE OF FENCE FOR SECURITY

PURPOSE: A fence for security is provided to save the installation cost and effort of the fence even without additionally adding up an invasion sensor to an existing steel net. CONSTITUTION: A security net is made up by using a tube type net wire and a fence is installed by using vertical and horizontal supports. Both ends of a communication cable(30) are electrically connected to a monitor installed in a central monitor chamber by using a conductive wire and a current is supplied to the communication cable. When the communication cable is made up of a fiber optic cable, an optical signal is supplied. When the net wire is cut to invade from the outside, the communication cable is simultaneously cut. Thus, the flow of an electric or optical signal is blocked. Herein, a sensor decides the invasion from the outside by sensing whether the flow of the electric or optical signal is blocked.