Abstract: A wall-mounted cabinet that is especially adapted for use as a security cabinet in a security system includes the cabinet and the equipment secured by the cabinet in such a manner that the system does not rely on surveillance by security personnel. The cabinet includes a housing with a back support panel securely fastened to a wall of the building that is being monitored. The panel fits around cables used to power or otherwise electrically service the equipment. The housing also has top, bottom and side panels projecting outwardly from the back panel, and shelves are located within the housing defining an upper and lower compartments. Upper and lower doors are mounted on the housing for movement between open and closed positions over the compartments, and locks on the doors secure the doors in their closed positions. Fasteners join the panels of the housing together so that access from the exterior of the cabinet when locked is prevented short of destroying the cabinet.