A safety system comprising - a safety unit, in particular a safety control; - at least one safety related participant which comprises a protective device and a first interruptible signal transmission path and a second interruptible signal transmission path which can be interrupted together on the occurrence of a non-secure state of the protective device; - at least one test signal path which starting from an output of the safety unit runs through the at least one safety related participant to a safety input of the safety unit and which comprises at least one of the first and the second interruptible signal transmission paths, wherein the safety related participant comprises an evaluation unit which is connected to the first signal transmission path and/or to a first switching signal output of the protective device controlling the interruption of the first signal transmission path, which evaluation unit is connected to the second signal transmission path and/or to a second switching signal output of the protective device controlling the interruption of the first signal transmission path and which evaluation unit is configured to check whether the first and the second signal transmission paths together are interrupted or are controlled for interruption, characterized in that the two interruptible signal transmission paths of the safety related participant are electrically connected in series to one another in the test signal path, in that the safety related participant comprises an interruption switch arranged in the test signal path and electrically connected in series to the first and the second signal transmission paths, and in that the evaluation unit is configured to open the interruption switch when the first and the second interruptible signal transmission paths together are not interrupted or controlled for interruption. - a safety unit, in particular a safety control; - at least one safety related participant which comprises a protective device and a first interruptible signal transmission path and a second interruptible signal transmission path which can be interrupted together on the occurrence of a non-secure state of the protective device; - at least one test signal path which starting from an output of the safety unit runs through the at least one safety related participant to a safety input of the safety unit and which comprises at least one of the first and the second interruptible signal transmission paths, wherein the safety related participant comprises an evaluation unit which is connected to the first signal transmission path and/or to a first switching signal output of the protective device controlling the interruption of the first signal transmission path, which evaluation unit is connected to the second signal transmission path and/or to a second switching signal output of the protective device controlling the interruption of the first signal transmission path and which evaluation unit is configured to check whether the first and the second signal transmission paths together are interrupted or are controlled for interruption, characterized in that the two interruptible signal transmission paths of the safety related participant are electrically connected in series to one another in the test signal path, in that the safety related participant comprises an interruption switch arranged in the test signal path and electrically connected in series to the first and the second signal transmission paths, and in that the evaluation unit is configured to open the interruption switch when the first and the second interruptible signal transmission paths together are not interrupted or controlled for interruption.