Wall-mounted electric equipment with altering preventor. The apparatus comprises a box-shaped container (20) and an anti-tamper device (23, 15); the box-shaped container is formed by a base member (21) having a side intended to be fixed to a wall (10, 11) and by a cover member (22) which can be fixed to the base member by means of removable fixing elements (19) which are accessible for removal only from the side of the base member that is intended to be fixed to the wall. The anti-tamper device is simple and easy to install since it comprises means (31, 15) for fixing the base member to the wall which are accessible by means of a tool only through an opening in the cover member, and closing means (32) which cannot be removed when the anti-tamper device is activated and which are suitable for preventing the introduction of the tool. In order to indicate tampering, the apparatus comprises a controllable electrical switch (33) and means (30e) for activating the switch which are associated with the means for fixing the anti-tamper device. |