A bracket encircles a conduit or lamp post and includes an opening for access to a cover attached to the conduit or lamp post and serves as a security device to prevent access to the electrical conductors behind the cover. A removable plate having a bottom edge engaged within a channel extends across the opening of the bracket. A tang extends from the bracket for penetrable engagement with a slot in the plate. An aperture in the tang extending through the plate is engageable with the shackle of a lock to preclude removal of the plate.