Abstract: An electrical installation includes: a switchgear cabinet; a protective switch arranged in the switchgear cabinet; at least one optical triggering device which is operatively connected to the protective switch and for triggering or switching off the protective switch upon optical detection of an arc; a detection device for detecting an access or an access request to a secured area of the electrical installation by detecting a presence of the at least one optical triggering device in a danger area of the electrical installation; and an electronic circuit which is connected to the detection device and allows, and otherwise prevents, a triggering or switching off of the protective switch by the at least one optical triggering device upon detection of the access or the access request, when the at least one optical triggering device is present in the danger area.

Abstract: A frame for a switch cabinet has a plurality of frame profiled elements connected to each other. At least two retainers vertically spaced apart from each other, which have holes for distribution bus bars, are arranged within the outer contour formed by the profiled elements. In an operating position, the retainers are oriented along a vertical axis. An electrically insulating bottom plate is arranged at a first end of the distribution, bus bars, the bottom plate having a region of overlap with the distribution bus bars. The bottom plate is detachably supported in a retainer connected to the frame profiled elements.