A monitoring system for a production operation of metal and/or sheet metal processing for monitoring an electrical consumer (92a, 92b), comprising - the consumer (92a, 92b) in the form of a production machine for processing sheet metal and/or metal, - a power grid with three phase conductors (84a-c), - an intermediate module via which the consumer (92a, 92b) can be connected to the power grid, with an input power connection for connecting the intermediate module to the power grid, wherein the input power connection has three phase conductor input contacts (16a-c) for contacting one phase conductor (84a-c) each of the power grid, and with an output power connection for connecting the consumer (92a, 92b) to the intermediate module, wherein the intermediate module is set up to determine the operating data of the consumer (92a, 92b) and to transmit information about the determined operating data to the power grid via the input power connection, wherein the intermediate module is set up to measure at least one parameter of an electric current that flows during operation from the power grid through the intermediate module to the consumer (92a, 92b), - a receiver module for receiving information about operating data of the consumer (92a, 92b) from the power grid, wherein the receiver module has a receiver power connection for connecting the receiver module to the power grid, and a processing device which is set up to receive the information about the operating data from the power grid via the receiver power connection, wherein the intermediate module has a connection for a camera and is set up to transmit an image received from the camera to the power grid. - the consumer (92a, 92b) in the form of a production machine for processing sheet metal and/or metal, - a power grid with three phase conductors (84a-c), - an intermediate module via which the consumer (92a, 92b) can be connected to the power grid, with an input power connection for connecting the intermediate module to the power grid, wherein the input power connection has three phase conductor input contacts (16a-c) for contacting one phase conductor (84a-c) each of the power grid, and with an output power connection for connecting the consumer (92a, 92b) to the intermediate module, wherein the intermediate module is set up to determine the operating data of the consumer (92a, 92b) and to transmit information about the determined operating data to the power grid via the input power connection, wherein the intermediate module is set up to measure at least one parameter of an electric current that flows during operation from the power grid through the intermediate module to the consumer (92a, 92b), - a receiver module for receiving information about operating data of the consumer (92a, 92b) from the power grid, wherein the receiver module has a receiver power connection for connecting the receiver module to the power grid, and a processing device which is set up to receive the information about the operating data from the power grid via the receiver power connection, wherein the intermediate module has a connection for a camera and is set up to transmit an image received from the camera to the power grid.