Abstract: A cover for an electrical outlet box which includes a plurality of bendable mounting clips constructed unitarily with the cover. In use, the mounting clips are oriented perpendicular to the outlet box cover and extend outwardly through an opening in a wall structure with the outer ends of the mounting clips then being bent outwardly into overlying engagement with the exterior of the wall surface in opposed relation to the outlet box cover thereby mounting the outlet box, and cover on the wall structure in alignment with the opening in the wall structure. The outlet box cover is mounted on the outlet box in a conventional manner and the mounting clips on the outlet box cover extend from the periphery of an opening in the cover for mounting electrical sockets, switches or the like in the outlet box in a conventional manner.

Abstract: A installation system for mounting electrical receptacle boxes within a building structure. The electrical receptacle box has at least one of a front contact positioning device for contacting the front wall surface of a wall and a rear contact positioning device for contacting the rear surface of the wall to thereby position the electrical receptacle box with respect to the wall. A bracket for mounting the electrical receptacle box to a structural member includes a clamping bracket which exerts a clamping force on opposing faces of the structural component and is slidable along the length of the structural component before being fixedly secured thereto. Preferably, the clamping bracket includes an adjustable biasing portion which is deflectable to define a variable clamping gap.

Abstract: A floor stand having two parallel uprights mounts an electrical box having a plaster ring, via fasteners passing between the parallel uprights, whereby the parallel uprights are clamped between the plaster ring and the electrical box.

Abstract: An apparatus support used for example inside a box may have on each of its opposite sides groove elements for being mounted on the side units of a wireway base when the base has such side units. Associated with the support by way of mechanical fastening element, is a plate having at least two projecting columns, with on the top part of the columns, snap-on elements, and the support correspondingly includes snap-on elements matching the snap-on elements of the plate columns.

Abstract: Apparatus in the form of a box unit or box assembly is disclosed for mounting in an opening in a wall wherein the apparatus is mounted from the front of the wall. A box body is positioned in the opening in the wall and anchored there to the wall by a flange located at least partly behind the wall and another flange in front of the wall. Embodiments of the present invention disclosed include electrical junction boxes.

Abstract: An electrical junction box having a double-wall structure includes a container body and an upper cover to be mounted on the container body. A peripheral wall of the container body is composed of an outer wall and an inner wall. There is provided a horizontal rib between the outer wall and the inner wall for partitioning a space between the outer wall and the inner wall into an upper space and a lower space. A plurality of upper ribs and a plurality of lower ribs extending in a vertical direction are respectively provided at a determined interval above and below the horizontal rib. The horizontal rib is provided with communicating holes, between respective pairs of the upper ribs, which communicate the upper space with the lower space.

Abstract: A device to permit upgrading of a building's utilities, as well as the addition thereto, such as but not limited to phone, tv, and electrical supply, to be inserted into new or preexisting sheet rock, or above or below the sheet rock to blend into the crown molding or baseboard as may be present. The device has a base frame to be attached to the studs in a cutout in the sheet rock, and which is sized in elevation to receive standard electrical boxes, and sized in width to preferably fit between adjacent studs, such as but not limited to 16 and 24 inches on center. A cover member element, has one edge located spline or a pair of spaced splines, each of which present matingly engages a respective slot formed in and extending forwardly on the base frame. In those areas along the length of the base frame occupied by utility boxes with components disposed therein, such components are covered over by standard electrical box cover plates which are attached in conventional fashion.

Abstract: An improved electromagnetic interference connection between a pair of electromagnetic interference enclosures that provides electromagnetic compatibility for electrical devices housed in the pair of electromagnetic interference enclosures. The connection includes of a detachable lap joint integrally formed along a first pair of edges in a first electromagnetic interference enclosure and a second pair of edges in a second electromagnetic interference enclosure. The lap joint forms a detachable overlapping metallic joint between the pair of electromagnetic interference enclosures that prevents electromagnetic emissions from the joint without the use of seals or fasteners.

Abstract: An elevator control box is constructed to avoid propagating a cable fire in the control box into the elevator shaft. The control box is incorporated in a wall of the elevator shaft and has an opening through which a cable is guided. A fireproof element is positioned in the control box surrounding the cable in the region of the opening.

Abstract: A distribution box for supporting a plurality of distribution jacks, each distribution jack having a first terminal and a second terminal, the distribution box being configured to permit a plurality of cables to be selectively interconnected with the plurality of distribution jacks, the distribution box includes a housing defining a hollow interior, The housing having a wall adapted to support The plurality of such distribution jacks such that the first terminal of each distribution jack is positioned in the hollow interior and the second terminal of each distribution jack is accessible from the exterior of the housing, and the housing having an opening configured to allow The cables to be routed into The hollow interior for interconnection to the first terminals of The distribution jacks; and a removable shield mountable over The opening and being adapted to seal around the cables disposed in The opening.

Abstract: A junction box for an aircraft that provides a convenient and secure means for routing electrical cables through a passenger compartment floor panel of an aircraft. The junction box is comprised of an enclosure that attaches to a bottom surface of the floor panel of the aircraft, and a cover, cable strain support, and gasket, that attach to a top surface of the floor panel. The walls of the enclosure can accommodate various shaped cutouts depending on the type of cable connectors being used with the cables. A portion of the cover is offset from the rest of the cover to provide an access opening for routing cables into the passenger compartment of the aircraft.

Abstract: For an electrical box having an open front, mounting an electrical device, and having a plaster ring, which fastens to the electrical box, around the open front, and which has a projecting portion defining a generally rectangular aperture providing access to the electrical device, through the open front, after the electrical box, the electrical device, and the plaster ring have been installed behind a wall panel, such as a drywall panel, a protective cover is mountable removably to the plaster ring so as at least substantially to cover the generally rectangular aperture of the plaster ring, whereby to protect the electrical device against foreign matter, damage, or both while an aperture accommodating the projecting portion of the plaster ring is cut into the wall panel or while the wall panel is being decorated near the aperture accommodating the projecting portion of the plaster ring.

Abstract: A method for installing a junction box in a recess beneath floor paneling in an aircraft. From above the floor, the box is inserted into an opening in the floor paneling while at least one spring clip is depressed against a side of the box until the box is in a desired position. The spring clip(s) are released to retain the box in the desired position, wherein the floor paneling constrains the clip(s) while supporting at least one box support tab. The method can be used to install junction boxes for in-flight systems for which it is desired to make connections under the aircraft floor. Because the box is installed and/or removed from above the floor, wiring installation time is reduced and ease of maintenance is enhanced.

Abstract: This invention relates to a wire-collecting box which make use of a box body with hollow interior, matching up with a rotating plate base capable of combining together, relying on the slotting buckled stick protruding out to the center of the plate base to slip on the buckled opening of the box body, so that electric wires and the like can pass through the slotting of the buckled stick and wires can be rolled and circled to fit into the wire-collecting box as rotating the plate disk, and combined the plate disk, connecting a plurality of wire-collecting boxes in series by one connection plate.

Abstract: A mounting formation for an electrical outlet box includes a dome and a flap. The dome has a base that is formed within an opening. The base is connected to the wall of the electrical outlet box and the flap is connected to the dome within the opening to cover a first portion of the opening while defining a second portion that is uncovered and crescent shaped. The mounting formation facilitates the installation of electrical outlet box, boxes without the need to separately remove a knock-out prior to the installation of fasteners.

Abstract: A junction box of the present invention includes a junction box body, and a casing for housing the junction box body in either an upright position or a horizontal position. On the junction box body, provided is first locking piece to be engaged with a first inner side face of the casing in a state of upright disposition of the junction box body. The first locking piece abuts on a second inner side face of the casing in a state of horizontal disposition of the junction box body. In addition, also provided is second locking piece to be engaged with the first inner side face of the casing in the state of horizontal disposition of the junction box body. The second locking piece abuts on the second inner side face of the casing in the state of upright disposition of the junction box body.

Abstract: An enclosure suitable for use in a telecommunications or data communications network includes a frame and a plurality of panels. The frame includes first and second upright frame members, an upper forward cantilevered frame portion including elongate side frame portions extending from the upright frame members substantially horizontally forwardly along opposite sides of the enclosure and an elongate transverse portion at the front, and an upper rearward cantilevered frame portion including elongate side frame portions extending from the upright frame members substantially horizontally rearwardly along opposite sides of the enclosure and an elongate transverse portion at the rear, the side frame portions being fixed directly or indirectly to the upright frame members. Similar lower forward and rearward cantilevered frame portions are also provided.

Abstract: A method for installing a junction box on a building framework in conjunction with the installation of wallboard includes providing a junction box having a junction box component, an extension component, and elements for connecting the extension component to the junction box component. The method proceeds by (i) mounting the junction box component on the building framework, (ii) mounting a sheet of wallboard on the building framework over the junction box component, (iii) cutting a hole in the sheet of wallboard in order to expose the junction box component, and (iv) inserting the extension component through the hole in the sheet of wallboard in order to thereby connect the extension component to the junction box component. Doing so significantly facilitates wallboard installation while enabling off-site mounting of a fixture on the extension component.

Abstract: One low voltage old work bracket can be ganged into a two-gang, three-gang, four-gang, etc. bracket with no modifications to the single bracket unit. The side walls are staggered so that the first side wall from the second bracket fits over the second side wall from the first bracket. Corresponding tongues and grooves hold the ganged brackets together. Each bracket preferably includes a wire retention tab and a pair of swing arms on opposing corners of the bracket frame.

Abstract: A prepackaged mounting assembly for securing a ceiling fan, light fixture, or similar device to an overhead beam. The prepackaged assembly securely holds all the hardware needed for attaching the mounting block to a beam, including fasteners and a junction box cover, without the need for an outer wrap or separate packaging for each separate mounting assembly. Several mounting assemblies can therefore be placed loosely in a large packaging container and stored and shipped without loss of the separate parts for each assembly. The L-shaped mounting assembly provides a significantly larger integral internal wiring cavity than those provided in prior art assemblies. The internal cavity includes a cover that is temporarily secured to the assembly for storage and shipment and may be removed and reinstalled after wiring connections are completed within the cavity.

Abstract: There is provided an adapter for mounting electronic equipment, such as telecommunications switching equipment, to a rack. The adapter is configured to comply with industry standards, such as the Electronic Industries Association standards, that prescribe how electronic equipment should be mounted and installed. The adapter also protects and guides fiber optic cables connecting a communications network to electronic circuitry units which form part of the electronic equipment. In compliance with Bellcore standards, the adapter provides means for bend radius control which ensures that the fiber optic cable does not have a bend radius of less than one inch as it is dressed between the electronic circuitry units and the communications network. A cable cavity defined by the adapter is intended to minimize that fiber optic cable contained therein catches on the equipment and clothing of service personnel.

Abstract: A shim for rigidly attaching an electrical device, such as a receptacle or switch, to an electrical box is described. The shim has means for frictionally engaging the attachment screw preventing it from falling off before the screw is attached to the box. The shim is made in varying thickness with each thickness of shim made from a different color for ease of identification.

Abstract: An enclosure for an electrical device includes a first wall portion. The first wall portion has a first cable through passageway with an edge, a portion of the edge being rolled. A second wall portion is adjacent the first wall portion and has a removable knock-out portion at least partially covering a second cable through passageway.

Abstract: A combination current sensor and relay has an improved housing. In one aspect, the housing includes light emitting diodes on an upper surface that indicate open circuit and short circuit conditions. In another aspect, the housing includes a securement structure for a circuit board that includes the transformer and switches for device operation, together with aligned openings therein for routing wires to external devices. In another aspect, a multiple position switch is included on the upper surface that indicates multiple modes of operation of the device. In another aspect, the housing may be assembled in multiple parts by affixing a first portion to a support, a circuit board to the first portion, and a second portion to the first portion. In another aspect, the housing is suitable for engagement to alternatively a junction box and a duplex box. In another aspect, the configuration of the upper surface provides usability advantages.

Abstract: An arragement for mounting a housing to a table. A mounting member includes a first wall adapted to be inserted into a housing and a second wall connected to the first wall and adapted to be secured to the table. The housing includes a guide for guiding the first wall into the housing. A positioning tab is provided on the second wall parallel to the first wall.

Abstract: An electrical and data services module to provide access to additional electrical and data receptacles which is used in conjunction with a flat work surface and a channel adjacent at least a portion of the flat work surface. The electrical and data services module has a first portion with at least one aperture therein for access to a power or data receptacle. The module also has a second portion which is slidably disposed in the channel, thereby allowing a user to easily move the module from one location to another in the channel.

Abstract: A protective ring apparatus includes a back plate and a riser wall which projects outward from the back plate. The riser wall is located peripheral to a back plate central access channel. A front frame is connected to a top portion of the riser wall, and the front frame defines a front frame access channel which is in registration with the back plate central access channel. A pair of twist links, located along a common link axis, are connected to opposite sides of the front frame. A removable protector plate is connected to the pair of twist links and, prior to its removal, covers and prevents wires in an open electrical box from being cut by a cutting tool used to cut a window in a sheet of drywall to be installed around an electrical box framed by the plaster ring apparatus.

Abstract: A pole mount cabinet for housing and supporting an article on a pole includes a housing having a rear wall and defining a chamber. The housing defines a rear opening in the rear wall. A mounting and support framework is adapted to be secured to the pole and includes at least one support member extending horizontally. The support member extends through the rear opening and into the chamber. The article can be positioned in the chamber such that it is supported by the support member.

Abstract: According to one embodiment of the invention, a method for converting a telecommunication chassis includes providing a telecommunication chassis that includes a housing having a front and a rear, a backplane coupled to the housing, and a cable interface board having an inside surface and an outside surface coupled to the housing adjacent the rear of the housing, the outside surface facing the same general direction as the rear of the housing, and rotating the cable interface board such that the outside surface of the cable interface board faces the same general direction as the front of the housing.

Abstract: A support bracket and extra-low voltage control device for installation with an electrical outlet box provides the capability of attaching or removing extra-low voltage (normally 30 volts or less) control of AC power (normally supplied at 120 volts) circuits such as lights. A controlling device in an enclosure (also called a control module) is attached to the exterior of one wall of an electrical outlet box, so that AC 120 volt wiring from the control module AC controlling device (a relay, a triac or a transistor) enters the electrical outlet box through an aperture in the wall of the electrical outlet box. Extra-low voltage control wiring enters the control module through an aperture in the control module enclosure and connects either to a relay coil or to an opto-coupling device within the control module enclosure to provide physical separation between the two wiring systems.

Abstract: For an electrical box having a plaster ring, which has a projecting portion defining a generally rectangular aperture, a protective cover having a front panel and flanges is mountable so as at least substantially to cover the generally rectangular aperture. A top flange has two lateral portions, each spaced by a slit from an upper edge of a lateral flange. A bottom flange has two lateral portions, each spaced by a slit from a lower edge of a lateral flange. Each lateral flange has an outer surface that is planar except for a recess adapted to receive a tool inserted between such lateral flange and an adjacent edge of the generally rectangular aperture.

Abstract: A temporary protective cover for an electrical box having an open front end includes in one embodiment a plate shaped to enclose the open front end and a pair of wings formed onto the plate for securing the cover onto the electrical box. A line of weakness extends across the rear surface of the plate from the right side edge to the left side edge. A plurality of posts are formed onto the rear surface of the plate and serve to limit movement of the cover when mounted onto the electrical box. The pair of wings are spaced adequately in from the left and right side edges of the plate and extend rearwardly from the rear surface of the plate at an angle away from one another. Each wing is shaped to include a flexible leg and an enlarged foot, the foot including a tapered guiding surface and a substantially flat engagement surface.

Abstract: A floor stand mounts an electrical box having a plaster ring. The electrical box defines a generally rectangular cavity, which is bounded by an upper wall, a lower wall, and two lateral walls, each wall having a distal edge and at least two said walls having ears projecting from their distal edges. The plaster ring defines a generally rectangular frame bounded by an upper member, a lower member, and two lateral members and is fastenable to the electrical box. The floor stand has two parallel uprights, each having an upper end and a lower end and each having an outer, backturned, stiffening flange. The floor stand has a structure bridging the upper ends of the two parallel uprights and a structure bridging the lower ends of the parallel uprights. The parallel uprights are positioned between the lateral members of the plaster ring and the distal edges of the lateral walls of the electrical box.

Abstract: A modular support and casing is provided with a selected circuit breadboard and circuit testing module for circuit construction and testing. Electrical and electronic components may be removably and interchangeably mounted on the circuit breadboard for constructing an electrical or electronic circuit in circuit development. A plurality of selective side plates are slidably and securely mounted on the longitudinal side edge portions of the support base. Auxiliary components such as switches and connectors may be conveniently provided in pre-formed openings on these side plates for ease in the circuit construction. A top cover is provided to maintain the side plates securely in place. The side plates form the side panels of the cover to provide a complete enclosure for protecting the electrical or electronic circuit thus constructed.

Abstract: A fastener designed to press into two slots of a barrier and become captivated with spring tension barbs is disclosed. The fastener thus allows two vertical barriers to be fastened together by driving a screw through a first barrier, a second barrier, and then the fastener, to compress the barriers in place during assembly. The fastener may be provided with a nut holding cage with caged nut or a pair of thread engaging flanges to secure the screw to the fastener.

Abstract: An interface device secures an instrument to a docking station having a casing having at least one signal port and a mounting rail mounted within a recessed portion of the casing. The signal ports may be power or data communications ports. A back panel forms part of an instrument housing for housing the instrument, a first portion protrudes rearward from the back panel and a first recess is carried by the protruding portion. The first recess is dimensioned to receive the mounting rail. A rail cam is rotatably mounted within the protruding portion and is aligned with the first recess to receive and retain the mounting rail and at least one first-portion signal port carried by the first portion. The first portion is dimensioned to fit within the recessed portion of the casing such that the rail cam is positioned to receive the mounting rail and the at least one first-portion signal port is aligned, in a complementary fashion, with the at least one casing signal port.

Abstract: A branch connection box for trunking includes a base and a cover. The base includes a central housing delimited by partitions that can be cut and form an electrical connection box and, around the central housing, an open path for routing electrical conductors or cables.

Abstract: A method for installing a sheet of wallboard over a previously installed junction box includes the steps of providing a magnet and a magnet-sensing device adapted to produce a human discernible signal when placed against an outwardly facing side of the sheet of wallboard in close proximity to the magnet. The method proceeds by mounting the magnet on the junction box, installing the sheet of wallboard over the junction box, searching for the junction box by moving the magnet-sensing device along the outwardly facing side of the sheet of wallboard until the sensor produces the human discernible signal, and then cutting an opening in the sheet of wallboard at the location of the junction box. A magnet-sensing device includes a housing supporting an electrical circuit that is adapted to produce a human discernible signal when placed in close proximity to a magnet located behind the wallboard.

Abstract: Moisture-proof flashing panel mounts for use on residential and commercial electrical junction box to be disposed within a building structure wall. The mounts are formed as a generally flat moisture-impermeable panel having therethrough an exteriorly projecting flanged opening defining a frame having an interior frame surface. The interior frame surface of the residential mount is complimentary in shape to the perimeter border of the residential junction box and is sized to allow the shaped border to reside by friction fit within the frame. The exteriorly projected flanged opening of the commercial mount simulates standard commercial single gang; 2 gang; 3/0 and 4/0 box configurations and is mounted to the junction box by plural threaded fasteners.

Abstract: A junction box mount structure in which a plug holder is secured by insertion within the interior section of the junction box that has a mount installed in an opening through the side of a junction box and a plug holder inserted onto the mount. The mount has a laterally extending collar section that is inserted into the junction box opening and, furthermore, the plug holder is aligned with and slipped into the collar section, and thereby positioned within the interior section of the mount. A retainer element is movably conjoined to each of the two sides of the mount and, furthermore, under normal conditions, the free ends of the retaining elements are tightly pulled by an elastic component and drawn into a state of compression such that after the plug holder is inserted, it is maintained in position by the retaining elements and cannot be pulled out while restrained within the mount.

Abstract: A receptacle for enclosing low-voltage electronic devices and maintaining the integrity of a vapor barrier. The receptacle includes a base, and four side walls. Each side wall is joined to two adjacent side walls to form a perimeter wall. The perimeter wall is joined to the base and extends from it in a generally perpendicular fashion. The perimeter wall and base delineate a generally rectangular enclosure with five closed sides and one open side. A mounting flange is joined to the four side walls and extends from them in a generally perpendicular fashion. The receptacle is positioned within a wall of a building so as to allow at least one flange direct contact with a structural member. The structural members of the wall and the receptacle are both covered with a barrier film. The barrier film is sealingly attached to the flange.

Abstract: A housing for a meter is disclosed. The housing includes a base portion which has an insertion axis along which the base portion can be inserted into an opening in a panel and an interior space for receiving electrical meter components. A flange extends laterally outwardly from the base portion and one or more resiliently flexible flaps extend from the base portion and are free to flex laterally inwardly about an axis generally parallel to the insertion axis and towards the base portion to permit passage of the flap or flaps through the panel opening when the base portion is inserted into the panel opening. The flap has a panel abutting surface that is axially spaced from the flange and at least partially laterally coextensive with the flange to define therebetween a slot or gap for receiving a portion of the panel adjacent the panel opening.

Abstract: Mounting assembly includes a junction box having a top wall and a downwardly extending side wall that define a cavity therein. A side mount may be disposed adjacent the junction box. A fixture support may be provided; and the side mount, the junction box, and the fixture support are disposed so that substantially all forces exerted on the fixture support are transferred to the side mount. The side mount may be attached to the junction box and may include a mounting plate configured for being secured to a support surface. The mounting plate may extend away from the junction box and may extend over the top wall of the junction box. A fastener may be provided which secures the side mount to the junction box. A fastener may be provided for securing the side mount to the support surface. The junction box may be made of plastic and the side mount may be made of metal.

Abstract: An enclosure including a housing and a plurality of plastic bushings is disclosed. The plastic bushing includes a pair of ends, both with an aperture, a bore running between the apertures, and a flange with a poly-sided perimeter. The flange engages the housing such that the bushing is translationally and rotationally fixed relative to the housing. The plastic bushing may include a plurality of glass fibers aligned with a longitudinal axis of the bore. The plastic bushing may be electrolytic dissolution resistant and corrosion resistant. The plastic bushing may have a thermal coefficient matching that of the plastic housing.

Abstract: Broadcast towers used for the co-location of wireless antennas and having a plurality of antenna wires spaced from a support are modified with an insulation system including flexible, non-conductive insulation sleeves to cover the lower section of the antenna wires. These sleeves include an inner tubular member having an inner diameter greater than the outer diameter of the antenna wire and an outer tubular member having an inner diameter greater than the outer diameter of the inner tubular member. An improved cabinet for isolating cables is also described. The cabinet includes a conductive housing having a top wall, a bottom wall, and parallel first and second side walls joining said top and bottom walls, and removable front and back plates. A non-conductive cable support frame is slidable within the housing. The side walls have corresponding attachment openings, whereby a side wall of one cabinet can be aligned with and attached to a side wall of another cabinet of the same construction.

Abstract: A modular holder for suspending conduit and junction boxes from a support surface by a single hanger wire or threaded rod. The holder has an elongate body with a central threaded bore extending along a longitudinal axis and opposed flat ends, a first transverse threaded bore disposed intermediate the opposed ends extending through the body along an axis perpendicular to the longitudinal axis, and a second transverse bore disposed near one of the opposed ends extending through the body along an axis perpendicular to the longitudinal axis. The holder body may be suspended in a vertical position by a hanger wire looped through the second transverse bore or screwed onto the bottom end of a threaded rod whereby the lower end of the body is connected to a conduit hanger or a junction box.

Abstract: A wiper motor device, in which a drive circuit portion and an output shaft are disposed adjacent to each other, capable of preventing water from reaching the drive circuit portion in a case where water invades along the output shaft, using an extension portion in which a cylindrical portion is externally fitted to the output shaft extends from the cover surrounding the upper opening of a casing which accommodates the drive circuit portion, and the lower part of a waterproof cap attached to the output shaft is externally fitted to the upper end part of the cylindrical portion.

Abstract: An amplifier for a portable telephone of the like is repaired or replaced without loss of an amplifying function even when the amplifier malfunctions. A plurality of door-shaped amplifier parts are provided on the left and right sides of an amplifier box. The left and right door-shaped amplifier parts can be mounted on opposite sides to each other. One amplifier part is in service and the other amplifier part is a backup. In a case where the amplifier part in service malfunctions, the other amplifier part is used or is mounted for use on the opposite side.

Abstract: The cabinet has four upright supports, which are connected to one another at the top and bottom in each case, for fixing the subassemblies and distribution components, the upright supports each having a comb-like limb that points obliquely outward and whose outer edge in each case forms an edge of the cabinet.

Abstract: An interface device secures an instrument to a docking station having a casing having at least one signal port and a mounting rail mounted within a recessed portion of the casing. The signal ports may be power or data communications ports. A back panel forms part of an instrument housing for housing the instrument, a first portion protrudes rearward from the back panel and a first recess is carried by the protruding portion. The first recess is dimensioned to receive the mounting rail. A rail cam is rotatably mounted within the protruding portion and is aligned with the first recess to receive and retain the mounting rail and at least one first-portion signal port carried by the first portion. The first portion is dimensioned to fit within the recessed portion of the casing such that the rail cam is positioned to receive the mounting rail and the at least one first-portion signal port is aligned, in a complementary fashion, with the at least one casing signal port.