Information system (1-1, 1-2) for providing mounting information (2-1 - 2-n) for a number of connectable devices (3-1 - 3-n) and electrical devices (4-1 - 4-n) to a user, comprising: a camera configured to record a scene , a display , a processing device coupled to the camera and the display and configured to display the scene in the display , and to identify in the scene a number of connectable devices (3-1 - 3-n) and/or receptacles (5-1 - 5-n), and to overlay the scene in the display with mounting information (2-1 - 2-n) for the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n), and a position sensor configured to identify the position and/or orientation of the camera in three dimensional space, wherein the processing device is configured to determine the position of the electrical devices (4-1 - 4-n) and/or the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n), wherein the processing device is configured to display the mounting information (2-1 - 2-n) at the position of the respective identified connectable devices (3-1 - 3-n) and/or the respective identified receptacles (5-1 - 5-n) on the display , and characterised in that the processing device is configured to calculate for all identified electrical devices (4-1 - 4-n) and/or the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n) the distance between the respective receptacles (5-1 - 5-n) which have to be connected by a connectable device (3-1 - 3-n) and verify prior to mounting if the connectable device (3-1 - 3-n) which is provided to connect the respective receptacles (5-1 - 5-n) is at least as long as the calculated distance. a camera configured to record a scene , a display , a processing device coupled to the camera and the display and configured to display the scene in the display , and to identify in the scene a number of connectable devices (3-1 - 3-n) and/or receptacles (5-1 - 5-n), and to overlay the scene in the display with mounting information (2-1 - 2-n) for the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n), and a position sensor configured to identify the position and/or orientation of the camera in three dimensional space, wherein the processing device is configured to determine the position of the electrical devices (4-1 - 4-n) and/or the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n), wherein the processing device is configured to display the mounting information (2-1 - 2-n) at the position of the respective identified connectable devices (3-1 - 3-n) and/or the respective identified receptacles (5-1 - 5-n) on the display , and characterised in that the processing device is configured to calculate for all identified electrical devices (4-1 - 4-n) and/or the identified connectable devices (3-1 - 3-n) and/or the identified receptacles (5-1 - 5-n) the distance between the respective receptacles (5-1 - 5-n) which have to be connected by a connectable device (3-1 - 3-n) and verify prior to mounting if the connectable device (3-1 - 3-n) which is provided to connect the respective receptacles (5-1 - 5-n) is at least as long as the calculated distance. <EOS>