Abstract:
An improved installation system for electrical hardware, such as power outlets, electrical switches, light fittings, ceiling fans and the like, whereby the cutting of their installation access holes in drywall panels is accomplished much faster than prior art methods and with a high degree of accuracy by the use of the hole cutting system, comprising the magnetic block assembly, corresponding magnetic template assembly and the hole cutter. In conjunction with the aforementioned; the electrical hardware&#39;s associated electrical boxes are wired directly to their electrical supply and the hardware is in turn, electrically connected to them by their respective sets of electrical terminals which make simultaneous contact with each other upon their installation. Additionally, the latching pawl mechanism and alignment device supports the weight of heavy light fittings and ceiling fans and aligns their electrical connections while they&#39;re being fixed into their installed position. These features taken together make this improved installation system substantially superior to all prior art.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to the field installation of domestic and commercial power outlets, electric switches and lighting fixtures. During a recent home renovation, the installation of domestic power outlets, electric switches, light fittings and their associated electrical boxes was found to be rather time consuming and installer unfriendly, particularly for a do-it-yourself installer. It was determined that these issues presented a considerable opportunity for improvements to the standard United States power outlet, electric switches, light fittings, their corresponding electrical boxes (collectively “electrical hardware”) and particularly the method of installation. Moreover it was realized that as a result of such improvements, considerable time and money can be saved during home construction if the electrical component installation process is made simpler, faster and more user friendly. 
     The improvements are achieved using a cartridge style installation system with a magnetic block, its matching magnetic template and innovative hole cutter. These devices speed up and simplify the installation process considerably, as well as making the location and cutting of installation holes completely accurate, every single time. The magnetic block is removably installed within the electrical box prior to installation of a drywall panel over them both. Subsequently, the matching magnetic template is attached to the outer surface of the drywall panel, it being held in place by the mutual magnetic attraction between its magnets and those of the magnetic block through the intervening drywall panel. Thus the template is accurately located for the marking of the installation hole outline. The hole cutter is then be used to accurately and quickly cut the installation hole for a power outlet, electric switch, light fitting, or ceiling fan as appropriate. The drywall panel is put up only once. 
     2. Description of the Prior Art 
     Previously, in order to accurately cut wall and ceiling power outlets and electric switch holes in drywall panels, also known as sheetrock and plasterboard, it needed to be offered up to its installed position over the electrical boxes, also known as wall boxes. Then the location of each electrical box had to be determined relative to the drywall panel&#39;s front face and the drywall marked with the outline of the desired holes. Conventionally, in order to do this, one or more people needed to hold the drywall panel steadily in its correct position while another person attempted to mark the outline of the desired hole(s) a prior art hole template might also have been used. Alternatively, the drywall needed to be temporarily tacked into position with drywall screws during this process. Either way, this was significantly more difficult for ceiling installations because of the weight of the drywall panels and the much more awkward overhead working position. Once the drywall was temporarily in place, however held, accurately determining the correct locations for the electrical box holes was difficult. This is because the electrical boxes are behind the wide panel of drywall and cannot readily be located from the front. Moreover they are often some distance from the edge of the drywall, making accurate hole location even more difficult. 
     A number of prior art attempts at overcoming these challenges have been made. However, to a greater or lesser degree, they are all rather unwieldy and without real commercial viability. For specific examples, see subsequent references to U.S. Pat. Nos. 3,745,664, 3,913,235 and 8,099,878. 
     For purposes of this application, it is necessary to distinguish between “new work” and “old work.” New work refers to installation of electrical hardware and wiring in original construction. Old work means installation of electrical hardware and wiring in pre-existing buildings and residences. 
     Because new work prior art electrical boxes were often designed to have their outer edges more or less flush with the front face of the drywall panel through the cut-out holes, the temporarily positioned drywall panel was often bowed over those boxes during mark out and consequently its edges were distorted from their final installed positions. Prior art electrical boxes that had a depth adjustment feature which allowed them to be initially flush with the rear face of the drywall (avoiding bowing) were still almost as difficult to accurately locate for hole mark out as other prior art alternatives. It follows that power outlet holes in drywall were prone to be mispositioned, sometimes necessitating unsightly repairs or the scrapping of material. 
     Prior art installation of drywall has been labor intensive and time consuming because it was often first put up into place for the marking out of power outlet and electric switch holes, taken down in order to cut the holes and then finally repositioned for permanent installation. Another problem with the prior art has been its awkward nature and the time it took to wire wall and ceiling power outlets, or light fittings and electric switches. In order to meet building codes, a minimum of 12 inches of power cable wires are often required inside each electrical box. This makes it cumbersome to install the power outlet, electric switch, or light fitting, particularly if more than one power cable needs to be used. This is because all the power cable wires had to be forced back into the electrical box behind the power outlet, electric switch, or light fitting before it was fastened into place. Moreover, wiring the power outlet, electric switch, or light fitting was often cumbersome and time consuming because the wires had to be held in the right place, wrapped around the electrical terminals, then held steady while the terminal screws were tightened. Therefore it was an operation more easily managed with an assistant. 
     In the case of prior art ceiling outlets for light fittings, the wiring of light fittings has been even more cumbersome because of having to work overhead and at the same time bear the weight of the light fitting. Ceiling fans and other large light fittings often had a temporary method of suspending their weight while wiring was completed. Even then, their size and bulky shape usually obstructed the electrical box, making wiring more difficult. 
     There have been several prior art attempts to overcome some of these concerns. However, to a greater or lesser degree, they have all fallen short of a complete solution for a number of reasons, which will now be explained. For example, U.S. Pat. No. 6,884,111 (“the &#39;111 reference”), also published as U.S. Pat. No. 7,081,010, U.S. Pat. No. 7,762,838, U.S. Pat. No. 8,028,408, US20030236010, US20050250378, US20080190640, US20100218374 and US20120021623 discloses a safety module electrical distribution system, which as far as is known, is the only commercially available product addressing any of these concerns. While this patent includes some novel safety features (column 2, lines 20-24), it is questionable whether the North American construction industry found these features of sufficient compelling value for the product to remain commercially viable for long. Moreover, this safety module electrical distribution system fails to address the issues of speeding up or simplifying the wiring of its associated electrical box. See FIGS. 16C and 16D of the &#39;111 reference and the associated write up at column 12, lines 24-41. Also see the electrical box for product #2 at website 
     http://protectconnect.com/spinningProdcts.html. 
     This safety module electrical distribution system also completely fails to teach any improvement to the drywall installation process. 
     Next, U.S. Pat. No. 7,744,407 (“the &#39;407 reference”) provides for a modular circuit system for use in an electrical wiring system with a circuit box and various modular inserts: power outlets, electric switches and the like. See column 1, lines 50 and 51. The circuit box has multiple sub-components arranged in a less than robust configuration and not conducive to commercial production (FIGS. 1 thru 27). The connections between the circuit box and the various modular inserts are flimsy and prone to misalignment and breakage. Like the previous reference, this reference fails to address the issues of speeding up or simplifying the wiring of its circuit box or installation of the drywall. 
     Also, U.S. Pat. No. 7,034,222 (“the &#39;222 reference”) provides for an electrical junction system having utility modules comparable to the modular inserts of the &#39;407 reference. The illustrated wiring connections for the junction box (FIGS. 1, 2, 4 and 6) are not accessible for maintenance or repair once the box has been installed behind drywall. Moreover, relying on the power cable&#39;s wires as its sole means of support once connected make them vulnerable to fracture, particularly when considering the brittleness typically induced in wiring by the cyclical heating and cooling that naturally occurs when electrical power is cycled on and off over a prolonged period. A brief reference was made to the possibility of the wires being secured to the junction box “by clamping action, or any other suitable action” (column 3, items 24a and 26). However, there is no elaboration on how that might be accomplished. It follows that, in the likely event of an electrical disconnection, the broken or loose wires would not be able to be re-connected without removal of the surrounding drywall, an unacceptable inconvenience to the user. Moreover, like the previous reference, this reference also fails to teach any improvement to the drywall installation process. 
     Also, U.S. Pat. Nos. 6,870,099 and 6,617,511 provide for a power distribution system very similar to that of the electrical junction system of the &#39;222 reference, but differ in the method of connection between its junction box with its junction devices (FIGS. 1 and 3) compared with those of the &#39;222 reference (FIGS. 2 thru 3). In similar fashion to the previous reference, the wiring connection arrangement is highly problematic and the power distribution system as a whole completely fails to teach any improvement to the drywall installation process. 
     U.S. Pat. Nos. 6,563,049; 6,465,735 and 6,156,971 provided for an electrical system comprised of modular components, similar to that of the &#39;407 &#39;222 references and U.S. Pat. No. 6,870,099. These patents detail a larger range of modular components than those recited above. See U.S. Pat. No. 6,563,049 abstract, and column 8, lines 22-38 and FIGS. 1-21. Like the &#39;222 reference, the wiring module base (electrical box), the power cables are connected into its external surface (FIG. 2 and column 8, lines 46-59). While this version uses a more robust method of connection, the connections are still not accessible once the drywall has been permanently installed. So as before, in the event of an electrical disconnection, the electrical box cannot be re-connected without removal of the surrounding drywall. Likewise, these references also completely fail to teach any improvement to the drywall installation process. 
     U.S. Pat. Nos. 4,165,443; 3,157,732 and 2,920,303 were all forerunners of the above detailed prior art. These are also similarly problematic for power cable connection and drywall installation. 
     U.S. Pat. No. 7,160,148 provided for various forms of ceiling fan and other electrically powered ceiling fixtures with “easy install” features (abstract and summary). With this reference, it is still necessary to manually connect individual electrical wires to the receptacle plate from the junction box. While the receptacle plate is easier to handle than a ceiling fan or light fitting, it still has to be held in position while the electrical connections are made, while the installer must stand at the top of a ladder with his arms over his head. Moreover, when the fan or light fitting needs to be replaced, the owner is also restricted to purchasing a replacement with the same exact receptacle plate (which may well not be available). Alternatively, he would have to carry out a full installation of a completely new unit, obviating the whole advantage of the “easy install” feature. Like the previous references, this reference failed to teach speeding up or simplifying wiring of the electrical box or installation of the drywall. 
     U.S. Pat. No. 8,099,878 teaches an electrical box template extension and a method for utilizing same. With this device, it is still necessary to take measurements and refer to integral leveling devices in order to accurately locate and orient the template in relation to the electrical box (column 4, lines 9-27). In essence, the only real benefit of this device is that it provides an accurate outline on an electrical box. Hole location errors are not significantly diminished over the prior art, neither is the implementation time significantly improved. 
     U.S. Pat. No. 3,913,235 (“the &#39;235 reference”) provides for a marking apparatus attachable to a switch, or outlet box for marking its outline on the rear face of a wall panel (abstract). This device requires that the drywall sheet be temporarily offered up into its installed position and be taken back down again, which is now an unnecessary and laborious additional step (Summary, column 1, lines 40-62). The device&#39;s accuracy depended on the drywall sheet being held in exactly the same place as its final installed position. Positional adjustments created smudges and made the correct hole location unclear. Moreover, this device does very little to speed up the process of accurate electrical box hole location and cutting. 
     U.S. Pat. No. 3,745,664 provides for a TEMPLET [sic] FOR ELECTRICAL BOXES (abstract). A forerunner of the &#39;235 reference, this is a stamp which is held on an electrical box and marks the rear face of the drywall sheet (abstract). This device runs into much the same issues as the &#39;235 reference. 
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                 Protect Connect 
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                 Blurton Jerry 
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                 Jon Guzallis, 
                 Electrical Box 
                 Lines 9 thru 
               
               
                   
                   
                   
                 Niantic, CT 
                 Template 
                 27, column 4 
               
               
                   
               
             
          
         
       
     
     SUMMARY OF THE INVENTION 
     Bearing in mind the foregoing, it is a principal object of the present invention that drywall panels can now be permanently installed without first needing to mark out and cut holes for the installation of power outlets, electric switches, light fittings and ceiling fans, realizing a substantial reduction in installation time. 
     It is a closely related principal object of the present invention that the foregoing object can be achieved because the drywall no longer has to be offered up to the wall studs or ceiling joists for marking out of the outlet holes, brought down, cut and held back up for accuracy checks before securing permanently in place. 
     Another principal object of the present invention is that drywall can now more easily be installed using significantly less physical effort and less manpower with a commensurate reduction in labor costs because additional people are no longer needed to hold the drywall in place while its holes are being marked out. 
     An additional related object of the present invention is that the drywall does not need to be taken down for hole cutting and lifted back up to check for accuracy of hole locations and drywall does not need to be taken back down for rework of misplaced holes before being lifted up again for final installation, thus avoiding unsightly time consuming repairs. 
     A further object of the present invention is that the entire wiring system for any new building can now be fully tested prior to drywall installation, making any required wiring changes or repairs comparatively quick and easy. 
     Another object of the present invention is the elimination of extra wire lengths from within the electrical box and the simplified electrical connections speed up and simplify power outlet, electric switch, light fitting and ceiling fan installation and reduces the likelihood of wiring errors. 
     An additional related object of the present invention is that wire connections are much safer to accomplish over prior art because screwdriver blade puncture wounds are far less likely to occur when power outlets and such do not need to be held by hand while tightening the terminal screws. 
     A further object of the present invention is that worn out or defective outlets, electric switches, light fittings and ceiling fans can easily be replaced in just a few minutes, even by an inexperienced do-it-yourself installer. 
     Another object of the present invention is that heavy or bulky light fittings such as ceiling fans are more easily installed and removed due to the addition of an integral latching pawl arrangement and the elimination of directly wired connections. 
     An additional object of the present invention is that the electrical boxes no longer need to contain 12 inches of extra power cable because this can now be looped in the space behind the box with the benefit that the electrical boxes can be about half the size of the prior art versions, thereby realizing a significant savings in material resources and costs. 
     Other objects and advantages will become apparent to those skilled in the art upon reference to the following descriptions and the appended drawings. 
     In accordance with a primary aspect of the invention there is provided a cartridge style installation system comprised of various apparatus that feature such components as a magnetic block, its matching magnetic template, an innovative hole cutter, cartridge electric boxes, and such mating components as electric sockets and electric switches. The magnetic block is removably installed within the electrical box prior to installation of a drywall panel over them both. Subsequently, the matching magnetic template is attached to the outer surface of the drywall panel, it being held in place by the mutual magnetic attraction between its magnets and those of the magnetic block through the intervening drywall panel. Thus the template is accurately located for the marking of the installation hole outline. The hole cutter is then used to accurately and quickly cut the installation hole for a power outlet, electric switch, light fitting, or ceiling fan as appropriate, after the magnetic block is removed. The electrical boxes are similar in appearance to prior art, but they are significantly smaller in depth and have embedded integral electrical connections. Power cable wires are connected directly to the electrical box&#39;s electrical terminals instead of to the power outlet, electric switch, light fitting, or ceiling fan themselves. Power outlet, electric switch, light fitting and ceiling fan cartridges are similar in appearance to their standard, prior art predecessors, but they have conducting pins that plug into corresponding integral receptacles within the cartridge style electrical boxes. The cartridge style power outlet, electric switch, light fitting and ceiling fan cartridges themselves need no wiring for installation into their cartridge style electrical boxes. Their conducting pins are inserted into corresponding receptacles within the electrical box and then they&#39;re fastened into place with screws in similar fashion to prior art, then covered with a standard cover plate or ceiling rose. The cartridge style light fittings and ceiling fans have the additional optional feature of a latching pawl, which holds them temporarily in place while they&#39;re being fastened into their permanent installed position. 
     In accordance with a secondary aspect of the present invention the foregoing description can be viewed as a method rather than as an apparatus. Therefore, the electrical box is disposed where desired and wired, a removable magnetic block is temporarily placed in the electrical box, drywall is installed over the box, the magnetic template is placed over the drywall in the proper location as determined by the magnets, the hole placement is marked, the template is removed, the hole cutter cuts the hole, the magnetic block is removed, and the electric outlet, electric switch or the like is plugged into the electric box as described above and then a cover plate is applied in the conventional manner. A similar approach is applied to ceiling installations such as a light fitting or ceiling fan. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Various other features of the invention will become apparent to those skilled in the art from the following discussion taken in conjunction with the appended drawings, in which: 
         FIG. 1  is a rear isometric view of a cartridge style power outlet assembly in its installed configuration. 
         FIG. 2  is a front isometric view of a cartridge style electrical box and magnetic block assembly. 
         FIG. 3 a    is a rear isometric view of a magnetic block assembly. 
         FIG. 3 b    is a front isometric view of a magnetic block assembly. 
         FIG. 4  is a bottom isometric view of a magnetic template assembly. 
         FIG. 5  is a front isometric view of a magnetic template assembly installed on drywall. 
         FIG. 6  is a front isometric view of a hole cutter assembly aligned with a magnetic template&#39;s outline. 
         FIG. 7  is a front isometric view of a cartridge style electrical box and a cartridge style power outlet cartridge. 
         FIG. 8 a    is a bottom isometric view of a cartridge style power outlet cartridge. 
         FIG. 8 b    is a top isometric view of a cartridge style power outlet cartridge. 
         FIG. 9  is a front isometric view of a cartridge style electrical box with cartridge style power outlet cartridge installed. 
         FIG. 10 a    is a front isometric view of a cartridge style electric switch. 
         FIG. 10 b    is a rear isometric view of a cartridge style electric switch. 
         FIG. 11  is a front isometric view of a cartridge style electrical box. 
         FIG. 12  is a rear isometric view of a cartridge style electrical box. 
         FIG. 13  is a front isometric view of a hole cutter assembly. 
         FIG. 14  is a rear isometric view of an alternate embodiment of a cartridge style power outlet assembly with a prototype light fitting variant in its installed configuration. 
         FIG. 15  is a front isometric view of a magnetic block assembly aligned with a cartridge style electrical box. 
         FIG. 16 a    is a bottom isometric view of a magnetic block assembly. 
         FIG. 16 b    is a top isometric view of a magnetic block assembly. 
         FIG. 17  is a bottom isometric view of a light fitting latching assembly and a cartridge style light fitting aligned with a cartridge style electrical box. 
         FIG. 18 a    is a rear isometric view of a light fitting latching assembly and a cartridge style light fitting. 
         FIG. 18 b    is a front isometric view of a light fitting latching assembly and a cartridge style light fitting. 
         FIG. 19  is a front isometric view of a ceiling rose aligned with a cartridge style electrical box. 
         FIG. 20  is a side orthogonal view of a ceiling rose installed on cartridge style electrical box, a light fitting latching assembly and cartridge style light fitting. 
         FIG. 21  is a sectioned rear isometric view of a ceiling rose installed on cartridge style electrical box, light fitting latching assembly and cartridge style light fitting. 
         FIG. 22  is an exploded front isometric view of an old work cartridge style electrical box and an attachment bracket. 
         FIG. 23  is a rear perspective view of an attachment bracket fixed in place with three screws. 
         FIG. 24  is a front exploded isometric view of a cartridge style electrical box aligned with main bracket. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. 
     Reference is now made to the drawings, wherein like characteristics and features of the present invention shown in the various figures are designated by the same reference numerals. 
       FIG. 1  shows an isometric view of the rear of one prototype version of the efficient installation electrical hardware system in its installed configuration. This first preferred embodiment is for a power outlet and it is illustrated to show how it would look from inside a wall. Item  11  is a piece of a standard timber wall stud, also commonly referred to as “two by four.” It represents the wall studs conventionally installed within interior walls to make up the supporting frame of a typical domestic or commercial room. Item  10  is a small piece of drywall, representing pan of the internal wall surface of such a typical room. In this version, item  1  is in this case, the plastic, cartridge style electrical box fixed in position by screw  4  (×3) to wall stud  11 . In this rear view, no more than one of screw  4  is visible. Item  14  is the power cable carrying electrical power into cartridge style electrical box  1 . Note that as is conventional practice, power cable  14  is held in place against the wall stud by metal staples, item  8 . Power cable  14  is routed through power cable routing hole  1   v  in web  1   t  protruding from the rear face of cartridge style electrical box  1 . Power cable routing hole  1   u  in web  1   t  is not used in this embodiment, though both routing holes are used when an electric switch is part of the embodiment. Power cable  14  is looped around in order to provide at least twelve inches of useable spare power cable commonly called for by the building codes in many States. In this embodiment, similar to prior art, power cable  14  is fed into the rear of cartridge style electrical box  1  through punch-out tab  1   p ; one of four such punch-out tabs;  1   p ,  1   q ,  1   r  and  1   s  (refer to  FIGS. 11 and 12 ). Punch-out tab  1   p  is illustrated in its un-punched configuration. Nonetheless, for the purpose of all the diagrams in  FIGS. 1  thru  9 , the reader is instructed to consider punch-out tab  1   p  as being punched out. 
       FIG. 2  shows an isometric view of one embodiment of magnetic block assembly  3  aligned with pin receptacle terminals  1   aa ,  1   bb ,  1   cc  and  1   dd  of cartridge style electrical box  1 . Also shown are ground wire  14   a , neutral wire  14   b  and hot wire  14   c  of power cable  14  as well as the other two screw  4 &#39;s used to fix cartridge style electrical box  1  to wall stud  11 . 
       FIGS. 3 a  and 3 b    show two other isometric views of the same embodiment of magnetic block assembly  3 , illustrating the electrically isolated pin arrangement that is designed to fit within the pin receptacle terminals,  1   aa ,  1   bb ,  1   cc , and  1   dd  of cartridge style electrical box  1  as illustrated in  FIG. 2 . Electrically isolated pin  3   a  of magnetic block assembly  3  fits into pin receptacle terminal  1   aa  of cartridge style electrical box  1  in  FIG. 2 . Electrically isolated pin  3   b  of magnetic block assembly  3  fits into pin receptacle terminal  1   bb  of cartridge style electrical box  1  in  FIG. 2 . Electrically isolated pin  3   c  of magnetic block assembly  3  fits into pin receptacle terminal  1   cc  of cartridge style electrical box  1  in  FIG. 2 . Electrically isolated pin  3   d  of magnetic block assembly  3  fits into pin receptacle terminal  1   dd  of cartridge style electrical box  1  in  FIG. 2 .  FIG. 3 b    also illustrates two cylindrical magnets  3   i  and  3   j  housed within magnetic block assembly  3 . 
       FIG. 4  shows an isometric view of one embodiment of magnetic template assembly  9  and illustrates cylindrical magnets  9   i  and  9   j  housed within magnetic template assembly  9 . Also identified are template holes  9   g  and  9   h.    
       FIG. 5  shows an isometric view of the same embodiment of magnetic template assembly  9  on the face of drywall  10 . Magnetic template assembly  9  is held in place by mutual magnetic attraction through drywall  10  between its two cylindrical magnets  9   i  and  9   j  and the corresponding two cylindrical magnets  3   i  and  3   j  of magnetic block assembly  3  installed within cartridge style electrical box  1  not visible here, but illustrated at  FIGS. 2, 3   a  and  3   b . Not illustrated here, but shown in  FIG. 6 , a penciled outline is drawn around magnetic template assembly  9  on drywall  10 . 
       FIG. 6  shows an isometric view of one embodiment of hole-cutter  15  aligned with the penciled outline marked on drywall  10 . Specifically, blade set  15   a  of hole-cutter  15  is aligned with the penciled outline created using magnetic template assembly  9 . 
       FIG. 7  shows an isometric view of one embodiment of cartridge style power outlet cartridge  2  aligned with pin receptacle terminals  1   aa ,  1   bb ,  1   cc , and  1   dd  and power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1 . Cartridge style electrical box  1  can be seen through the rectangular cut-out hole in drywall  10  that was cut by hole-cutter  15  shown in  FIG. 6 . Power outlet installation hole  1   e  is not visible in this view, but is shown in  FIG. 11 . Also illustrated are installation screws  2   e  and  2   f , designed to fit within power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1 . Also illustrated are, spacers  2   m  and  2   n.    
       FIGS. 8 a  and 8 b    show two other isometric views of this embodiment of cartridge style power outlet cartridge  2 , illustrating the arrangement of conducting pins  2   a ,  2   b  and  2   c  that are designed to fit within pin receptacle terminals  1   aa ,  1   bb  and  1   cc  respectively of cartridge style electrical box  1   aa  illustrated in  FIG. 7 . Installation screws  2   e  and  2   f , designed to fit within power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1 . Also illustrated are ground tabs  2   k  and  2   l  and threaded hole,  20 . Conducting pin  2   a  of cartridge style power outlet cartridge  2  fits into pin receptacle terminal  1   aa  of cartridge style electrical box  1  in  FIG. 7 . Conducting pin  2   b  of cartridge style power outlet cartridge  2  fits into pin receptacle terminal  1   bb  of cartridge style electrical box  1  in  FIG. 7 . Conducting pin  2   c  of cartridge style power outlet cartridge  2  fits into pin receptacle terminal  1   cc  of cartridge style electrical box  1  in  FIG. 7 . Installation screw  2   f  fits into power outlet installation hole  1   f  of cartridge style electrical box  1  illustrated in  FIGS. 7 and 11 . Installation screw  2   e  fits into power outlet installation hole  1   e  of cartridge style electrical box  1  illustrated in  FIG. 11 , but not visible in  FIG. 7 . 
       FIG. 9  shows an isometric view of the same embodiment of cartridge style power outlet cartridge  2  fully installed within pin receptacle terminals  1   aa ,  1   bb  and  1   cc  and power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1  and fixed in place with installation screws  2   e  and  2   f . In this view, cartridge style power outlet cartridge  2  can be seen in its installed position within the rectangular cut-out hole in drywall  10 . Also shown is power outlet cover plate  13  aligned with hole,  2   o  of cartridge style power outlet cartridge  2 . It also shows cover plate mounting screw  12  aligned with mounting hole,  13   o  of power outlet cover plate  13  and hole,  2   o  of cartridge style power outlet cartridge  2 . 
       FIGS. 10 a  and 10 b    show two isometric views of the first preferred embodiment of the cartridge style electric switch  17  which may also be used with cartridge style electrical box  1  along with a wiring arrangement appropriate for an electrical switch. Conducting pins  17   a ,  17   b ,  17   c  and  17   d  are designed to fit within pin receptacle terminals,  1   aa ,  1   bb ,  1   cc , and  1   dd  respectively of cartridge style electrical box  1  similar to conducting pins  2   a ,  2   b  and  2   c  of cartridge style power outlet cartridge  2  as illustrated in  FIGS. 7, 8   a  and  8   b . Also illustrated are installation screws  17   e  and  17   f , designed to fit within power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1  illustrated in  FIG. 11 ; also shown are ground tabs  17   k  and  17   l , spacers  17   m  and  17   n  and switch cover plate mounting holes  17   x  and  17   y.    
       FIG. 11  shows an isometric view of the first preferred embodiment of the cartridge style electrical box  1  as is illustrated in  FIGS. 1, 2 and 7 . However, in this view and in  FIG. 12 , plastic housing  1   i  of cartridge style electrical box  1  is shown as transparent plastic in order to properly illustrate the embedded and partially embedded components which are shaded in order to distinguish them from each other and Plastic housing  1   i . Plastic housing  1   i  provides a cavity suitable to house and electrically insulate cartridge style power outlet cartridge  2  and the end connections of power cable  14  from their surroundings. Plastic housing  1   i  also provides the structural foundation and mountings for all the electrical hardware of cartridge style electrical box  1 . Specifically, plastic housing  1   i  provides the structural support and electrical insulation for electrical conductors  1   a   4 ,  1   b   4 ,  1   c   4  and  1   d   4  which are embedded within its walls. These conduct electrical current between pin receptacle terminals  1   aa ,  1   bb ,  1   cc  and  1   dd  and terminal bases  1   a   1 ,  1   b   1 ,  1   c   1  and  1   d   1  respectively. Specifically, electrical conductor  1   a   4  is electrically connected to horizontally oriented pin receptacle terminal  1   aa . Pin receptacle terminal  1   aa  is embedded within the rear wall of plastic housing  1   i  and is designed to accommodate and make electrical connection with conducting pin  2   a  of cartridge style power outlet cartridge  2 , refer to  FIGS. 7 and 8   a . The majority of pin receptacle terminal  1   aa  is exposed to view, but sits within top, right hand quadrant,  1   ja  of a raised rectangular structure, or box  1   j  which is subdivided into four compartments, quadrants  1   ja ,  1   jb ,  1   jc  and  1   jd  and protrudes forward from the approximate center of the rear wall of plastic housing  1   i . The other end of electrical conductor  1   a   4  is electrically connected to terminal base  1   a   1 . Terminal base  1   a   1  is embedded within the right hand &amp; upper walls of plastic housing  1   i  beneath the “GROUND” label  1   i   3  and along with terminal clamp  1   a   2  and machine screw  1   a   3  is designed to accommodate and make electrical connection with the ground wire  14   a  of power cable  14  ( FIG. 2 ). In this version, approximately half of terminal base  1   a   1  is embedded within the upper and right hand walls of plastic housing  1   i , with the threaded portion exposed to view and protruding at an angle of approximately 45° to front flange face  1   i   1  of plastic housing  1   i . Terminal clamp  1   a   2  is secured to terminal base  1   a   1  by machine screw  1   a   3 . This makes for a continuous electrical connection between terminal base  1   a   1 , terminal clamp  1   a   2 , electrical conductor  1   a   4  and pin receptacle terminal  1   aa . Electrical conductor  1   b   4  is electrically connected to vertically oriented pin receptacle terminal  1   bb . Pin receptacle terminal  1   bb  is embedded within the rear wall of plastic housing  1   i  and is designed to accommodate and make electrical connection with conducting pin  2   b  of cartridge style power outlet cartridge  2 , refer to  FIGS. 7 and 8   a . The majority of pin receptacle terminal  1   bb  is exposed to view, but sits within the bottom right hand quadrant,  1   jb  of the box  1   j . The other end of electrical conductor  1   b   4  is electrically connected to terminal base  1   b   1 . Terminal base  1   b   1  is embedded within the right hand and lower walls of plastic housing  1   i  above “NEUTRAL” label  1   i   4  and along with terminal clamp  1   b   2  and machine screw  1   b   3  is designed to accommodate and make electrical connection with neutral wire  14   b  of power cable  14  (ref  FIG. 2 ). In this version, approximately half of terminal base  1   b   1  is embedded within the bottom and right hand walls of plastic housing  1   i , with the threaded portion exposed to view and protruding at an angle of approximately 45° to front flange face  1   i   1  of plastic housing  1   i . Terminal clamp  1   b   2  is secured to terminal base  1   b   1  by machine screw  1   b   3 . This makes for a continuous electrical connection between terminal base  1   b   1 , terminal clamp  1   b   2 , electrical conductor  1   b   4  and pin receptacle terminal  1   bb . Electrical conductor  1   c   4  is electrically connected to vertically oriented pin receptacle terminal  1   cc . Pin receptacle terminal  1   cc  is embedded within the rear wall of plastic housing  1   i  and is designed to accommodate and make electrical connection with conducting pin  2   c  of cartridge style power outlet cartridge  2 , refer to  FIGS. 7 and 8   a . The majority of pin receptacle terminal  1   cc  is exposed to view, but sits within the bottom left hand quadrant,  1   jc  of the box  1   j . The other end of electrical conductor  1   c   4  is electrically connected to terminal base  1   c   1 . Terminal base  1   c   1  is embedded within the left hand and lower walls of plastic housing  1   i  above “HOT 1” label  1   i   5  and along with terminal clamp  1   c   2  and machine screw  1   c   3  is designed to accommodate and make electrical connection with hot wire  14   c  of power cable  14  (ref  FIG. 2 ). In this version, approximately half of terminal base  1   c   1  is embedded within the bottom and left hand walls of plastic housing  1   i , with the threaded portion exposed to view and protruding at an angle of approximately 45° to front flange face  1   i   1  of plastic housing  1   i . Terminal clamp  1   c   2  is secured to terminal base  1   c   1  by machine screw  1   c   3 . This makes for a continuous electrical connection between terminal base  1   c   1 , terminal clamp  1   c   2 , electrical conductor  1   c   4  and pin receptacle terminal  1   cc . Electrical conductor  1   d   4  is electrically connected to vertically oriented pin receptacle terminal  1   dd . Pin receptacle terminal  1   dd  is embedded within the rear wall of plastic housing  1   i  and is designed to accommodate and make electrical connection with conducting pin  17   d  of cartridge style electric switch  17 , refer to  FIG. 10 b    (cartridge style power outlet cartridge  2  does not have a fourth conducting pin). The majority of pin receptacle terminal  1   dd  is exposed to view, but sits within the top left hand quadrant,  1   jd  of the box  1   j . The other end of electrical conductor  1   d   4  is electrically connected to terminal base  1   d   1 . Terminal base  1   d   1  is embedded within the left hand and upper walls of plastic housing  1   i  beneath “HOT 2” label  1   i   6 . In some versions it is unconnected. However, in other versions and along with terminal clamp  1   d   2  and machine screw  1   d   3  it is designed to accommodate and make electrical connection with the hot wire of an additional power cable as when using cartridge style electric switch  17 . Approximately half of terminal base  1   d   1  is embedded within the top and left hand walls of plastic housing  1   i , with the threaded portion exposed to view and protruding at an angle of approximately 45° to front flange face  1   i   1  of plastic housing  1   i . Terminal clamp  1   d   2  is secured to terminal base  1   d   1  by machine screw  1   d   3 . This makes for a continuous electrical connection between terminal base  1   d   1 , terminal clamp  1   d   2 , electrical conductor  1   d   4  and pin receptacle terminal  1   dd . Also illustrated is main cavity  1   i   10 . 
       FIG. 12  shows a rear perspective view of the same embodiment of the cartridge style electrical box  1  as is illustrated in  FIGS. 1, 2, 7 and 11 . Illustrated in this view are web  1   t  and power cable routing holes  1   u  and  1   v . Web  1   t  is used to add structural rigidity to plastic housing  1   i  and provides a way to route a loop of a minimum of twelve usable inches of spare length of power cable  14  through power cable routing holes  1   u  and  1   v  (see  FIG. 1 ). Also identified are mounting holes  1   y  and  1   z  which are located in Rear flanges  1   k   1  and  1   k   2  which are used to add structural rigidity to plastic housing  1   i  and provide a way to mount cartridge style electrical box  1  to wall stud  11  with up to two of screw  4  through mounting holes  1   y  and  1   z  (refer to  FIG. 1 ). Also identified in this view are punch-out tabs  1   p ,  1   q ,  1   r  and  1   s.    
       FIG. 13  shows an isometric view of one embodiment of hole-cutter assembly  15  as illustrated in  FIG. 6 . Hole-cutter assembly  15  is to be positioned with its blades  15   a   1  thru  15   a   8  against drywall  10  and aligned with the penciled outline illustrated in  FIG. 6 . The end of handle  15   b  is then struck with a suitable mallet in order to thrust blades  15   a   1  thru  15   a   8  into the surface of drywall  10 . In this version of hole-cutter assembly  15 , blades  15   a   1  and  15   a   5  are identical, as are blades  15   a   2  and  15   a   6 , as are blades  15   a   3  and  15   a   7  and blades  15   a   4  and  15   a   8  for a total of eight blades. These blades protrude through blade mounting plate  15   e  which mounts them rigidly in the correct configuration against blade base plate  15   c  for cutting accurate holes in drywall, such as drywall  10  illustrated in  FIG. 6 . Blade mounting plate  15   e  is fixed over blade spacing plate  15   d  and onto blade base plate  15   c  by countersink screws  15   f   1  and  15   f   2  which are identical to each other in this version. Also, in this version of hole-cutter assembly  15 , blade spacing plate  15   d  is made of a resilient material in order to allow for easy replacement of blades  15   a   1  thru  15   a   8 , which may become distorted over time due to the percussive shock created by striking handle  15   b  with a mallet. Blade base plate  15   c  is fixed to handle  15   b  by the male threaded portion  15   b   4  of handle  15   b  screwing into it and locked in place by lock nut  15   g . Handle  15   b  is used to hold hole-cutter assembly  15  in its correct position while the end of handle  15   b  is struck with a mallet ( FIG. 6 ) mallet not shown. Blade base plate  15   c  is used to transmit the percussive shock produced in handle  15   b  by the impact of the mallet into blades  15   a   1  thru  15   a   8  and cause them to puncture the surface of drywall  10  ( FIG. 6 ). 
     Method of Installation and Function of First Preferred Embodiment, FIGS.  1 - 13   
     This method of installation procedure provides instructions on how to install the first preferred embodiment of the present invention. 
     We refer first to  FIGS. 1, 2 and 12 . Using three of screw  4 , fix cartridge style electrical box  1  onto wall stud  11  at the desired height above the room&#39;s floor with its open cavity facing into the room. Specifically, use one of screw  4  to fix rear flange  1   k   1  of cartridge style electrical box  1  ( FIG. 12 ) to the side of wall stud  11 . Use the remaining two of screw  4  to fix lobe  1   i   2  of cartridge style electrical box  1  to the room side edge of wall stud  11  ( FIGS. 2 and 11 ). Using as many of metal staple  8  as needed, fix power cable  14  into place on the side of wall stud  11  as shown in  FIG. 1 . Strip back the sheathing of power cable  14  to expose five to six inches of ground wire  14   a , neutral wire  14   b  and hot wire  14   c  ( FIG. 2 ). Route power cable  14  through power cable routing hole  1   v  in web  1   t  which protrudes from the rear face of cartridge style electrical box  1  ( FIG. 1 ). Loop power cable  14  around to provide a minimum of twelve inches of useable spare cable at the rear of cartridge style electrical box  1  and feed its end through punch-out tab  1   p . Punch-out tab  1   p  is illustrated in its un-punched configuration. Nonetheless, for the purpose of all the diagrams referred to in these instructions, the reader is instructed to consider punch-out tab  1   p  as being punched out. Having the twelve inches of useable spare cable looped behind cartridge style electrical box  1  instead of inside it is a significant advantage over prior art for at least three reasons:
         1. There is now no excess electrical wire inside cartridge style electrical box  1  to hinder the installation of cartridge style power outlet cartridge  2 , or cartridge style electric switch  17 .   2. The relatively short wire lengths inside cartridge style electrical box  1  are comparatively easy to tuck neatly out of the way compared to the twelve inch lengths needed in prior art.   3. A significant reduction in the use of raw materials is accomplished because cartridge style electrical box  1  can be about half the size of prior art alternatives since it no longer needs to accommodate the excess electrical wire.
 
Next we address  FIGS. 2 and 11 and 12 . Back off machine screw  1   a   3  sufficient to allow ground wire  14   a  to pass between terminal clamp  1   a   2  and terminal base  1   a   1 . Pull the end of ground wire  14   a  towards the user threading it between terminal clamp  1   a   2  and terminal base  1   a   1  until the excess wire is taken up. Tighten machine screw  1   a   3  until ground wire  14   a  is securely gripped between terminal clamp  1   a   2  and terminal base  1   a   1  and trim off the excess wire with a pair of wire cutters. Trim back the length of neutral wire  14   b  as appropriate in order for it to be connected to terminal base  1   b   1  without any excess wire that might hinder the installation of cartridge style power outlet cartridge  2 . Cut back approximately half an inch of the insulation from the end of neutral wire  14   b . Back off machine screw  1   b   3  sufficient to allow the stripped last half inch of neutral wire  14   b  to pass between terminal clamp  1   b   2  and terminal base  1   b . Neatly tuck neutral wire  14   b  along the rear face of main cavity  1   i   10 , down its right hand edge and fit its stripped end between terminal clamp  1   b   2  and terminal base  1   b   1 . Tighten machine screw  1   b   3  until neutral wire  14   b  is securely gripped between terminal clamp  1   b   2  and terminal base  1   b   1  and trim off any excess wire with a pair of wire cutters. Trim back the length of hot wire  14   c  as appropriate in order for it to be connected to terminal base  1   c   1  without any excess wire that might hinder the installation of cartridge style power outlet cartridge  2 . Cut back approximately half an inch of the insulation from the end of hot wire  14   c . Back off machine screw  1   c   3  sufficient to allow the stripped last half inch of hot wire  14   c  to pass between terminal clamp  1   c   2  and terminal base  1   c   1 . Neatly tuck hot wire  14   c  along rear face of main cavity  1   i   10 , along its rear top edge, down its left hand edge and fit its stripped end between terminal clamp  1   c   2  and terminal base  1   c   1 . Tighten machine screw  1   c   3  until hot wire  14   c  is securely gripped between terminal clamp  1   c   2  and terminal base  1   c   1  and trim off excess wire with a pair of wire cutters. Connecting power cables to the terminal bases is a significant advantage over prior art for at least six reasons:
   1. Wire connections are more easily and quickly accomplished because the terminal bases are stable, being fixed in place relative to the wall on which cartridge style electrical box  1  is mounted, making connection an easy, two handed operation. Whereas prior art power outlets usually have to be held by hand, or left hanging while the installer holds a screw driver in one hand and the electrical wire in the other. An operation ideally requiring three hands.   2. Wire connections are much safer to accomplish over prior art because screwdriver blade puncture wounds are far less likely to occur when the power outlet doesn&#39;t need to be held by hand while tightening the terminal screws.   3. Trimming excess wire from the terminal bases is also faster and more easily accomplished because the terminal bases are fixed in place relative to the wall.   4. Appropriate wire length is much easier to gauge and trim to length because much less wire is needed inside cartridge style electrical box  1  than is the case with prior art.   5. Wire connections are typically much neater and they are faster and easier to accomplish over many prior art connections because the wire ends can be left straight and they don&#39;t need to be wrapped around the terminal screws.   6. Wiring errors are far less likely over prior art alternatives because of the orderly and uniform terminal layout and the clear, large and easily read terminal labels. Making the product much more attractive to the less skilled installer.       

     Now we address  FIGS. 2, 3   a  and  3   b . Insert electrically isolated pins  3   a ,  3   b ,  3   c  and  3   d  of magnetic block assembly  3  into pin receptacle terminals  1   aa ,  1   bb ,  1   cc  and  1   dd  of cartridge style electrical box  1 . Make sure front face  3   r   1  of magnetic block assembly  3  is flush with front flange face  1   i   1  of cartridge style electrical box  1 . 
     Next we turn to  FIGS. 4 and 5 . Trim the drywall panel to properly fit into the wall space and onto the wall studs as is appropriate for the present situation. Having done that, fasten the drywall panel into its permanent position on the wall studs with a choice of screws over cartridge style electrical box  1  containing magnetic block assembly  3 . Using this version of the cartridge style power outlet, the user may employ any standard thickness of drywall from ⅜″ up to ⅜″ thick. The cartridge style electrical box provides at least two major advantages over the prior art alternatives:
         1. Notwithstanding normal cutting to size and fit, drywall is able to be permanently installed over the cartridge style electrical box the 1st time every time. Whereas prior art often needs to have drywall offered up to its position several times in order to mark out and cut the power outlet holes and to subsequently check those holes for accurate size, shape &amp; location.   2. Prior art electrical boxes often fit through the drywall flush with its outer surface. Whereas this “new work”* version of the cartridge style electrical box fits flush with the inner drywall surface. This reduces bowing of the drywall panel prior to hole cutting, making for a far more accurate fit of the drywall panel in its final installed position on the wall as well as more accurate hole positions.       

     Refer now to  FIGS. 4, 5 and 6 . Place front face  9   r   3  of magnetic template assembly  9  on the outer surface of drywall  10  in the vicinity of magnetic block assembly  3  which is now on the other side of drywall  10 . Move magnetic template assembly  9  around until it snaps into position opposite magnetic block assembly  3  due to the mutual attraction between its cylindrical magnets  9   i  and  9   j  and cylindrical magnets  3   i  and  3   j  of magnetic block assembly  3 . Mark the outline of magnetic template assembly  9  with a pencil on the outer surface of drywall  10 . Remove magnetic template assembly  9  from the outer surface of drywall  10 . Position blade set  15   a  of hole-cutter  15  squarely on the outer surface of drywall  10  and aligned with the penciled outline that was just made. Strike the end of handle  15   b  of hole-cutter  15  squarely with a suitable mallet or similar tool in order to force blade set  15   a  into the outer surface of drywall  10  ( FIG. 6 , mallet not shown). 
     See  FIGS. 2 and 7 . Withdraw hole-cutter  15  from drywall  10  and clean up the resulting rectangular cut-out hole with a suitable knife or box cutter (knife not shown). Place the user&#39;s index finger and thumb either side of magnetic block assembly  3  and withdraw it from cartridge style electrical box  1 . 
     This system of hole location and creation is a major advantage over prior art for four reasons: 
     
         
         
           
             1. This hole location and creation system guarantees 100% accuracy for power outlet hole location, size and shape. 
             2. This hole location and creation system is much quicker than prior art. 
             3. This hole location and creation system substantially reduces the incidence of scrapped drywall panels. 
             4. This hole location and creation system presents the opportunity for suppliers to create additional revenue streams from the proprietary tools that it requires. 
           
         
       
    
       FIGS. 7  thru  9  and  11 . Make sure that spacers  2   m  and  2   n  of this embodiment of cartridge style power outlet cartridge  2  are the appropriate length for the thickness of the drywall; ⅜″ long for ⅜″ thick drywall, ½″ long for ½″ thick drywall and ⅝″ long for ⅝″ thick drywall and so on. Insert conducting pins  2   a ,  2   b  and  2   c  of cartridge style power outlet cartridge  2  into pin receptacle terminals  1   aa ,  1   bb  and  1   cc  of cartridge style electrical box  1 . Screw home installation screws  2   e  and  2   f  of cartridge style power outlet cartridge  2  into power outlet installation holes  1   e  and  1   f  of cartridge style electrical box  1  (power outlet installation hole  1   e  is shown in  FIG. 11 ). 
     The cartridge style power outlet is a major improvement over prior art for at least four reasons:
         1. The cartridge style power outlet snaps easily and quickly into its installed position. Whereas most prior the art alternatives need to be crammed into their power box along with and over at least three twelve inch lengths of spare wire.   2. The cartridge style power outlet&#39;s electrical connections are completed as it&#39;s snapped into its installed position without the need to attach to it any wires.   3. Worn or damaged cartridge style power outlets can be quickly replaced within the space of a few minutes.   4. Incidences of wiring errors during replacement are significantly reduced. Making the product much more attractive to the less skilled installer.       

       FIG. 9 . Fasten power outlet cover plate  13  onto cartridge style power outlet cartridge  2  and the outer surface of drywall  10  by tightening cover plate mounting screw  12  through mounting hole  13   o  into hole,  2   o  of cartridge style power outlet cartridge  2 . The cartridge style power outlet is now installed and ready for use. Once installed and ready for use, the day to day function of this version of the cartridge style power outlet is very similar to prior art power outlets, in that a user will insert the power cord plug of an electrical appliance into the cartridge style power outlet and it then provides an appropriate electrical supply to the appliance. The advantages of this arrangement are mostly realized during installation and replacement. 
     Cartridge style electrical box  1  is equally suitable for use with cartridge style electric switch  17 . 
     Detailed Description—Second Preferred Embodiment. FIGS.  14  Thru  21   
       FIG. 14  shows an isometric view of the rear of the second preferred embodiment of the present invention. This embodiment is a prototype light fitting variant in its installed configuration, or how it would look from above the ceiling layer of drywall. Ceiling joist  20  is a piece of a standard timber, also commonly referred to as “two by ten”, “two by eight”, or “two by twelve” etc., depending on its size. It represents the ceiling joists conventionally installed above a room to make up the supporting frame of a typical domestic room. Drywall  10  is a small piece of drywall or sheetrock, representing part of the ceiling of such a typical room. In this version, cartridge style electrical box  19  is fixed in position by four of screw  4  to ceiling joist  20 . In this rear view, only two of screw  4  are visible. Power cable  21  carries electrical power into cartridge style electrical box  19 . Note that as is conventional practice, in this version power cable  21  is held in place against the ceiling joist by staples, in this case two of staple  8 . Power cable  21  is routed through power cable routing hole  19   u  in web  19   t  protruding from the rear face of cartridge style electrical box  19 . In this version, power cable  21  is looped around in order to provide at least twelve inches of useable spare power cable commonly called for by the building codes in many States. In this embodiment, similar to prior art and the first preferred embodiment, power cable  21  is fed into the rear of cartridge style electrical box  19  through punch-out tab  19   p . Punch-out tab  19   p  is shown in its un-punched configuration. Nonetheless, for the purpose of all the diagrams in  FIGS. 14 to 21 , the user is instructed to consider punch-out tab  19   p  as being punched out. Item  28  is a cut short version the light fitting support tube which is a generic mechanical connection and wiring conduit to various kinds of light fitting and ceiling fan. 
       FIG. 15  shows an isometric view of the front of the same version of the cartridge style electrical box  19  in its installed configuration, or how it might look from inside a room. Also shown is one embodiment of magnetic block assembly  23  aligned with pin receptacle terminals  19   aa ,  19   bb ,  19   cc  and  19   dd  of cartridge style electrical box  19 . Magnetic block assembly  23  is very similar in its function to magnetic block assembly  3 . The only real difference being that its shape is adapted for use with cartridge style electrical box  19 . 
       FIGS. 16 a  and 16 b    show two other isometric views of the same embodiment of magnetic block assembly  23 , illustrating the electrically isolated pins  23   a ,  23   b ,  23   c  and  23   d  designed to fit within pin receptacle terminals  19   aa ,  19   bb  and  19   cc  of cartridge style electrical box  19 . Also shown are cylindrical magnets  23   i  and  23   j.    
       FIG. 17  shows an isometric view of one embodiment of light fitting latching assembly  26  and cartridge style light fitting  27  aligned with pin receptacle terminals  19   aa ,  19   bb  and  19   cc  and cartridge style light fitting installation holes  19   e  and  19   f  of cartridge style electrical box  19 . 
       FIGS. 18 a  and 18 b    show two other isometric views of these embodiments of light fitting latching assembly  26  and cartridge style light fitting  27  which are shown as one assembly. Conducting pins  27   a ,  27   b  and  27   c  are designed to fit within pin receptacle terminals,  19   aa ,  19   bb , and  19   cc  respectively of cartridge style electrical box  19  illustrated in  FIG. 17 . Also shown are installation screws  26   e  and  26   f ; designed to fit within light fitting installation holes  19   e  and  19   f  of cartridge style electrical box  19  illustrated in  FIG. 17 . Light fitting alignment posts  27   jg  and  27   jh  of cartridge style light fitting  27  fit into light fitting alignment holes  19   jg  and  19   jh  of cartridge style electrical box  19  and the spring loaded latching pawls  26   je  and  26   jf  of light fitting latching assembly  26  act upon latching pawl ramps  19   je  and  19   jf  of cartridge style electrical box  19  until they engage with latching hooks  19   k   26   je  and  19   k   26   jf  of cartridge style electrical box  19  ( FIG. 21 ). Conducting pin  27   a  of cartridge style light fitting  27  fits into pin receptacle terminal  19   aa  of cartridge style electrical box  19  in  FIG. 17 . Conducting pin  27   b  of cartridge style light fitting  27  fits into pin receptacle terminal  19   bb  of cartridge style electrical box  19  in  FIG. 17 . Conducting pin  27   c  of cartridge style light fitting  27  fits into pin receptacle terminal  19   cc  of cartridge style electrical box  19  in  FIG. 17 . Installation screws  26   e  and  26   f  fit through mounting holes  26   e   2  and  26   f   2  of light fitting latching assembly  26  and into light fitting installation holes  19   e  and  19   f  of cartridge style electrical box  19  in  FIG. 17 . 
       FIG. 19  shows an isometric view of one embodiment of ceiling rose  22  aligned with installation holes,  19   l  and  19   m  of cartridge style electrical box  19 . It also shows Ceiling rose installation screws  32   l  and  32   m  aligned with holes  22   l  and  22   m  of ceiling rose  22  and installation holes,  19   l  and  19   m  of cartridge style electrical box  19 . A cut short version of light fitting support tube  28  is shown installed in light fitting latching assembly  26 . 
       FIG. 20  shows a side view of cartridge style light fitting in its installed configuration. 
       FIG. 21  shows a sectioned isometric view of the cartridge style light fitting in its installed configuration. In this view details are shown of how latching pawl  26   je  of light fitting latching assembly  26  engages with latching hook  19   k   26   je  of cartridge style electrical box  19 . Also shown is how light fitting alignment post  27   jh  fits into light fitting alignment hole  19   jh  of cartridge style electrical box  19 . Also illustrated are ceiling rose  22  and a cut short version of light fitting support tube  28  in their installed positions. 
     Method of Installation and Function of Second Preferred Embodiment.  FIGS. 14  Thru  21 . 
     This method of installation provides instructions on how to install the second preferred embodiment of the cartridge style electrical installation system, one of the light fitting variants. The function of this second preferred embodiment is also explained. 
     Refer to  FIGS. 14 and 15 . Using four of screw  4 , fix cartridge style electrical box  19  onto ceiling joist  20  at the desired position on the room&#39;s ceiling with its open cavity facing down into the room. Specifically, use two of screw  4  to fix housing mounting bracket assembly  19   k  of cartridge style electrical box  19  to the underside of ceiling joist  20  as shown. Use the remaining two of screw  4  to fix lobe  19   i   2  of cartridge style electrical box  19  to the room side edge of ceiling joist  20  ( FIG. 15 ). Housing mounting bracket assembly  19   k  provides the additional strength necessary to support heavier light fittings and ceiling fans. Apart from this, the first portion of the installation method for the first preferred embodiment is basically the same as it is for this second preferred embodiment. The user should start reading those instructions for  FIGS. 1, 2 and 12  and stop prior to the instructions for  FIGS. 7-9 and 11 . 
     Next refer to  FIGS. 17, 18   a  and  21 . Now insert light fitting alignment posts  27   jg  and  27   jh  of cartridge style light fitting  27  ( FIG. 18 a   ) into light fitting alignment holes  19   jg  and  19   jh  of cartridge style electrical box  19  ( FIG. 17 ). These keep the spring loaded latching pawls  26   je  and  26   jf  and mounting holes  26   e   2  and  26   f   2  of light fitting latching assembly  26  properly aligned with latching pawl ramps  19   je  and  19   jf  and light fitting installation holes  19   e  and  19   f  respectively of cartridge style electrical box  19 . Push up light fitting latching assembly  26  and cartridge style light fitting  27  until the spring loaded latching pawls  26   je  and  26   jf  of light fitting latching assembly  26  engage with latching hooks  19   k   26   je  and  19   k   26   jf  of cartridge style electrical box  19  ( FIGS. 18 a    and  21 ). Conducting pins  27   a ,  27   b  and  27   c  of cartridge style light fitting  27  ( FIG. 18 a   ) will now have been inserted into pin receptacle terminals  19   aa ,  19   bb  and  19   cc  of cartridge style electrical box  19  ( FIG. 17 ). Screw home installation screws  26   e  and  26   f  through mounting holes  26   e   2  and  26   f   2  of light fitting latching assembly  26  into light fitting installation holes  19   e  and  19   f  of cartridge style electrical box  19  ( FIG. 17 ). 
     Now refer to  FIG. 19 . Align mounting holes  22   l  and  22   m  of ceiling rose  22  with installation holes  19   l  and  19   m  of cartridge style electrical box  19  and insert Ceiling rose installation screws  32   l  and  32   m  through mounting holes  22   l  and  22   m , then screw them into installation holes  19   l  and  19   m  of cartridge style electrical box  19 . This covers over light fitting latching assembly  26  and cartridge style light fitting  27  with ceiling rose  22 , providing an esthetically pleasing protection from electric shock. The cartridge style light fitting is now installed and ready for use. 
     In summation, this embodiment of the cartridge style light fitting may be installed as new work or also as old work as long as the user has access to the top of the ceiling joists. Once installed and ready for use, the day to day function of this second preferred embodiment of the present invention is very similar to prior art light fittings, in that a user will turn on electrical power at a electric switch or hanging cord switch, the light will illuminate and, or the fan will start to rotate. The advantages of this arrangement are mostly realized during installation and replacement. This second preferred embodiment of present invention has several more significant advantages over prior art:
         1. As with embodiments one, wiring of the electrical terminals in the cartridge style electrical box is far simpler and more easily accomplished than with prior art.   2. The cartridge style electrical pin connections removes the need to make wiring connections with the light fitting or ceiling fan suspended near its final installed position and so avoids having the light fitting obstruct what was previously often a cumbersome and awkward wiring process at the top of a ladder.   3. The spring loaded latching pawl arrangement allows the light fitting or ceiling fan to be quickly and easily suspended in its correct approximate permanent installed position with holes properly aligned for quick and easy fastening of installation screws.   4. Old light fittings of this kind can be quickly replaced within the space of a few minutes, by disengaging the spring loaded latching pawl arrangement.       

     Detailed Description of the Third Preferred Embodiment. FIGS.  22  Thru  24   
       FIG. 22  shows a partially exploded perspective view of a prototype old work version of third preferred embodiment of the present invention. This version is for power outlets and electrical switches, but the design may also be adapted for light weight light fittings. Cartridge style electrical box  30 , attachment bracket  29  and captive depth adjustment screw  31  are illustrated in this view. Here it can be seen how captive depth adjustment screw  31  is located within snap-in receptacle  30   z  of cartridge style electrical box  30 . Also illustrated are runners  30   w  and  30   x  of cartridge style electrical box  30  which slide between guide rails  29   w  and  29   x  of attachment bracket  29 . Additionally identified are break-off flange  29   a , main bracket  29   b  and tab  29   h  also of attachment bracket  29 . Further identified are upper and lower flanges  30   w   1  and  30   x   1  respectively, adjustment screw clearance channel  30   z   1 , screw terminals  30   a ,  30   b    30   c  and  30   d  and front face  30   i  of cartridge style electrical box  30 . The functional difference between this version and the first embodiment is that it may be installed after the room&#39;s drywall panels are already in place. The main physical differences between this version and the first embodiment are:
         1. Cartridge style electrical box  30  is attached to wall studs via attachment bracket  29 , whereas cartridge style electrical box  1  is attached directly to wall studs without an attachment bracket.   2. Attachment bracket  29  is attached to wall stud  11  by three of screw  4  ( FIG. 23 ).   3. Cartridge style electrical box  30  is slid into its installed position within attachment bracket  29  and secured in place with captive depth adjustment screw  31 . Specifically, runners  30   w  and  30   x  of cartridge style electrical box  30  are slid in between guide rails  29   w  and  29   x  which are located at the top and bottom edges of attachment bracket  29  ( FIGS. 22 and 24 ).   4. The installed depth of cartridge style electrical box  30  within the drywall cut-out hole is adjusted with captive depth adjustment screw  31  so that its front face is flush with the front face of drywall  10  ( FIG. 24 ).       

     Cartridge style electrical box  30  accepts cartridge style power outlet cartridge  2  and cartridge style electric switch  17  basically the same way as cartridge style electrical box  1  does, but without the need for spacers  2   n  and  2   m , or  17   n  and  17   m  (refer to  FIGS. 7 and 10   b ). This is because front face  30   i  of cartridge style electrical box  30  is designed to be flush with the front face of drywall  10  (refer to  FIGS. 22 and 24 ). 
       FIG. 23  shows an isometric view of attachment bracket  29  fixed onto wall stud  11  through a hole in drywall  10  with three of screw  4  through holes  29   d   1 ,  29   e  and  29   f   1 . 
       FIG. 24  shows a partially exploded isometric front view of Cartridge style electrical box  30 , main bracket  29   b  of attachment bracket  29  and captive depth adjustment screw  31 . Main bracket  29   b  is shown installed on wall stud  11  with break-off flange  29   a  removed. 
     Method of Installation and Function of Third Preferred Embodiment, First refer to  FIGS. 22  thru  24 . This method of installation provides instructions on how to install the third preferred embodiment of the present invention. The function of this third embodiment is also explained. 
     Next turn to  FIGS. 22 and 23 . For the purpose of clarity, the existing old work power cable is not shown in  FIG. 23 . While holding attachment bracket  29  in its correct position as shown in  FIG. 23 , fix it in place with three of screw  4  through holes  29   d   1 ,  29   e   1  and  29   f   1  into wall stud  11 . Having properly fixed attachment bracket  29  in its correct position ( FIG. 23 ), separate break-off flange  29   a  from main bracket  29   b  by gripping tab  29   h  ( FIG. 22 ) with a pair of pliers and bend it towards the user along crimp line  29   c  ( FIG. 23 ). Bend it back and forth several times until it breaks away from main bracket  29   b . Discard break-off flange  29   a.    
     Now refer to  FIG. 24 . As with the first and second embodiments, knock out the appropriate punch-out tab(s) in the back of cartridge style electrical box  30 . Then feed the end of the existing power cable through the hole. If the wires at the end of power cable  14  are damaged or are deteriorated and so long as there&#39;s sufficient spare cable length; strip back the sheathing of power cable  14  to expose five to six inches of ground wire  14   a , neutral wire  14   b  and hot wire  14   c . Now in a similar fashion to the instructions provided for  FIGS. 2, 11 and 12  in the installation procedure for the first embodiment, connect ground wire  14   a , neutral wire  14   b  and hot wire  14   c  to screw terminals  30   a ,  30   b  and  30   c  respectively. Now, if it&#39;s not already in place, snap captive depth adjustment screw  31  into snap-in receptacle  30   z  of cartridge style electrical box  30  as shown in  FIG. 22 . Now insert runners  30   w  and  30   x  of cartridge style electrical box  30  in between guide rails  29   w  and  29   x  at the top and bottom edges of main bracket  29   b . Screw captive depth adjustment screw  31  into punched receptacles  29   z   1  and  29   z   2  of main bracket  29   b  and adjust captive depth adjustment screw  31  until front face  30   i  of cartridge style electrical box  30  ( FIG. 22 ) is flush with the front face of drywall  10 . Now remove spacers  2   n  and  2   m  from cartridge style power outlet cartridge  2 , or spacers  17   n  and  17   m  from cartridge style electric switch  17  as appropriate (refer to  FIGS. 7 and 10   a ). Insert cartridge style power outlet cartridge  2  (or cartridge style electric switch  17  as appropriate) into cartridge style electrical box  30  ( FIG. 22 ). Screw installation screws  2   e  and  2   f  of cartridge style power outlet cartridge  2  (or installation screws  17   e  and  17   f  of cartridge style electric switch  17 , as appropriate) all the way into installation holes  30   e  and  30   f  of cartridge style electrical box  30 . Electrical connection is accomplished in the same way as it is for the first and second embodiments. As with the first preferred embodiment of the present invention, once installed and ready for use, the day to day function of this version is very similar to prior art. The advantages of this arrangement are mostly realized during installation and replacement. 
     GLOSSARY OF TERMS 
     
         
         
           
             Ceiling Joist: Wooden beam typically used to build the underlying structure of a ceiling. 
             Drywall panel: A rigid board made of layers of fiberboard or paper par bonded to a gypsum plaster core, used instead of plaster or wood panels in construction to form walls and ceilings. Also called gypsum board, wallboard. 
             Electrical power: The electricity typically provided via the National Grid or a generator. 
             Latching paw: A hook or similar device that engages within a groove in order to restrain movement in one direction. 
             New work electrical box: Designed for use where a room&#39;s drywall panels are yet to be installed. 
             Old work electrical box: Designed for use where a room&#39;s drywall panels are already in place and the electrical box has to be installed through a hole cut in the drywall. 
             Power cable: An electrical cable consisting of several electrical conductors, or wires some, or all of which are typically insulated and all wrapped together in an outer layer of electrical insulation. Used for running electrical power from one place to another. 
             Wall stud: Vertical member in the light frame construction technique called balloon framing of a building&#39;s wall. Made out sheet metal or lumber and commonly referred to as “two by four”. 
             Wiring: 1. The act of connecting electrical wires to electrical terminals.
           2. Electrical wires of any kind, usually part of or connected to some kind of electrical device.   
         
           
         
       
    
     While the invention has been described, disclosed, illustrated and shown in various terms or certain embodiments or modifications which it has assumed in practice, the scope of the invention is not intended to be, nor should it be deemed to be, limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended.