MXPA97001986A - Baru neutra visi - Google Patents

Abstract

The present invention relates to an improved electric charge center having a neutral bar and a base board for mounting the neutral bar, wherein the improvement comprises a neutral bar which is a solid unitary member having: an elongated central body portion with a cross-sectional area in trapezoidal shape with side walls extending downward, sloping outwards, the side walls having a plurality of openings for the insertion of electrical wires, an upper portion extending from the central body portion and having a plurality of internally threaded holes at least one of which is in communication with a corresponding opening of the plurality of openings in the side walls, and a base portion extending from the central body portion mounted to the base board including also mounting rails formed between them a groove in the form of generally T, and in of at least one of the mounting rails has a flange, and wherein the base board further includes an integrally formed securing means and extending upwards from this securing the mounting rails to the base board and comprises at least less a flexible snap-fit hook extending upwardly engaging the flange of at least one mounting rail

Description

BAR NEUTRA VISIBLE FIELD OF THE INVENTION The present invention relates generally to electrical load centers and more particularly to an improved load center and load center components.

BACKGROUND OF THE INVENTION Electric load centers experience many limitations. Mounting the various components of the load center, such as the cut-out panel for the metal housing of the load center, often requires an electrical to align the holes in these components, insert screws through the aligned holes and screw each screw in the holes. Such activities are time consuming and often not successful on the first attempt and have to be repeated several times. According to one aspect of the present invention, there is provided an attachment fastener of the push screw inwards for the metal housing, which allows an electrical to easily secure the guard to the metal housing.

Sometimes an overpressure condition is created within a load center, which can cause the door of the prior art load centers to be forced to open. According to one aspect of the present invention, a new and improved bolt or bolt is provided which, during the overpressure condition within the load center, causes the bolt to engage the bolt receptacle in the trimmed panel even more securely, in such a way that the door does not open. Because load centers are constructed in various sizes, for each size of load center built by a manufacturer, a separate inventory of base boards have been manufactured and maintained. Therefore, there is a need to develop base boards which are adaptable for various sized load centers and which are relatively inexpensive to manufacture. This need is partially met by the production and use of baseboards. Alternatively, piece of auxiliary, modular, individual base boards are built for interconnection to realize the switch of the adjustable length load centers. Because the angular assembly of the components is not well suited for robotic assembly, some prior art baseboards and modular extensions have been adapted to be vertically loaded downwardly to couple the portions of the baseboard, or have been adapted to be connected horizontally or laterally to couple the portions of the base board. Such joining methods and modular construction can not be advantageous and can result in inaccurate separation between the connected modular pieces, which may affect the subsequent assembly «= > installation of the components to the base board and the base board to the housing. In accordance with one aspect of the present invention, a board is provided. base and a new and improved modular extension base board, which can be assembled robotically, but do not need to be robotically assembled in only a vertical down or a lateral mode and which reduce the possibility of misalignment and separation inadequate between the modular pieces connected. Asking the base board to the accommodation, it often consumes time and is bulky. According to one aspect of the present invention, an improved base board having mounting characteristics is provided, which facilitates the mounting of the base board to the housing, thus saving time and labor. It is well known in the art to provide an electrically insulating barrier between the common connection bars of the load centers. In accordance with one aspect of the present invention, an improved base board is provided which integrally formed an insulating, electrical barrier between the common connecting rods, which increases the protection of the presence or formation of an archway, as well as decreases the possibility of holding the arch, once it has occurred. Common connection bars have been secured to the base board by common fastening devices, such as screws, bolts and snap fasteners (U.S. Patent No. 4,536,823) which can be tedious, time consuming in application , non-economic, requires extra parts and more importantly, can impart stresses to the component that is insured and adversely affect the structural integrity of the component. Applying ultrasonic energy to the poles, which are integral parts of; A plastic base board as a means of deforming the post to secure the connection bars common to the plastic base board is well known (US Pat. No. 4,118,754). Stacking with heat as a means for securing the components to a plastic base board can be advantageous in overcoming the disadvantages set forth in the above of the common fastening devices, but imparts tensions which are concentrated on the surface of the board. base, where the base of the pole intersects the base board to form the corners. Such tension can significantly damage the integrity of the connection causing a fracture of the post, loss of the integrity of the connection and a decrease in the service life of the base board and the load center. In accordance with one aspect of the present invention, an improved base board is provided having integrally formed poles for securing therein components, such as common connecting rods and the like by heat stacking, which reduces the stresses imparted to the poles. and the base boards of the stack with heat. As is well known, it has been difficult for the installers to secure the cables back to the neutral bars of the charging centers of the prior art, because it is generally difficult to see the holes in the neutral bar within which the cables go to be placed. To improve the visibility of the holes in the neutral bars within which the return wires of the power circuits are to be inserted and secured and thus facilitating the connection of the neutral return wires to the neutral bars by the installer electrical, according to one aspect of the present invention, an improved neutral bar is provided, which allows observation of the electrical connector openings placed in the side walls, when viewed either directly on the top or side.

Also, the prior art joining methods between the neutral bar and the base board are unsatisfactory. According to one aspect of the present invention, the neutral bar is adapted to allow simplified assembly and mounting to the base board. This is done by providing a configuration of the neutral bar and an improved base board to which the neutral bar is attached, which does not require the use of screws or other separate fastening devices, so that the number of components in the bar is reduced. center of load and facilitates the assembly of the neutral bar to the base board. Further, to further facilitate the installation of the wires back to the neutral bars of the load center, according to one aspect of the present invention, an improved base board having an integrally formed neutral bar wire guide is provided, which helps the electrician or the installer in guiding the wires of the power distribution circuits in the openings of the electrical connector in the neutral bars. In accordance with another aspect of the present invention, an improved neutral clamping bar is provided, which connects the neutral bars together. Some prior art charging centers are not grounded because the installer or the user does not comply when doing so. However, there is a need to ensure that there is no potential difference between the neutral bar and the ground. According to this aspect of the present invention, the neutral clamping bar is adapted to be able to be electrically connected to the outer metal housing of the load center, thereby eliminating any potential difference between the neutral bar and the earth of the load. load center. Since each power company provides service that maintains the neutral potential to near zero volts, the function of connecting the neutral part of the load center to the ground is performed by electrical connection of the neutral union rod to the outer metal housing . In accordance with one aspect of the present invention, a new and improved insulating terminal lug or barrier is provided between the incoming service and the other components of the load center operating to: isolate each of the main terminal lugs of the connecting rod neutral common, the neutral union rod and the lug or neutral lugs; reduces incidental shortening or inadvertent energization of live conductors both during installation and subsequent operation; and maintaining the oversurface and through air separation for cooling and expansion of the main terminal lugs.

BRIEF DESCRIPTION OF THE INVENTION According to the invention, the load center housing is adapted to receive and is fitted with a push screw fastening accessory comprising an open end of a U-shaped structure formed by the bending of a piece of sheet metal what's wrong with it; (a) an upper surface having two tabs formed therein, facing each other and directed inwardly and downwardly, each of the tabs having a free end that forms an opening therebetween to receive the threads of a screw and which are flexed by axial pressure to form a one-way opening, the upper surface further has two protrusions extending outwardly; and (b) two side walls extending downwardly and substantially orthogonally from the top surface, each of the side walls having a tongue formed therein and directed outwardly and upward to hold an edge of the hole, between the tongue directed upwards and outwards and the projection that extends outwards. The bolt of the load center door comprises a one-piece molded member, placed in an opening in the door, the one-piece member has a flat upper surface with an indentation to open the bolt, a body portion extending from a lower side of the flat surface, which is slidably received in an opening in the door, the body portion having a flexible tongue extending in an upward direction at a separating angle, of the body and towards the free edge of the door. The one-piece molded member further includes a hook positioned from the underside of the upper part, the hook having a free end extending toward the tongue of the body for engagement of an edge on the underside of a portion of a panel of trimming of the load center and which is adapted to form an opening adjacent to the opening in the door. The tongue pushes the door latch towards the first edge of the door, keeping the hook engaged in a deviated manner with the edge of the lower side of the portion of the trim panel adapted to form the opening. The base board of the load center is an integrally formed pressure-adjusting base board, comprising a one-piece molded member having a flat surface for mounting the common connecting rods, at least one support rail switch that extends upwardly from the flat surface to support the switches in the load center, the switch support rail has at one end an upper end wall and at a second end a lower end wall, the end wall bottom is adapted to have a groove with an upper edge. The press fit base board has at least one modular extension mounting base extending from the lower end wall to receive a modular extension base board, to extend the length of the press fit base board . The modular extension mounting base comprises an upper wall and two side walls and a front wall and a rear wall which is arranged to form a hollow rectangular box, the rear wall is formed by the end wall of the switch support rail, the upper wall and one of the two side walls of the modular extension mounting base having a trapezoidal shaped slot extends therethrough for coupling by a correspondingly shaped ramp of the modular extension base board to align the board Modular base extension to the base board by pressure adjustment. The upper wall of the modular extension mounting base further includes an opening for passing through it a flexible adjusting hook extending from the modular extension base board to engage the upper edge of the groove formed in the wall lower end of the support rail , -a, of the switch and therefore ensures the modular extension base board to the base board of pressure adjustment. The base board of the load center comprises a flat surface for mounting the common connection rods, the flat surface has a tongue extending from one edge of the flat surface, the tongue has a sloping bottom edge and a tip which extends on a lateral edge. The base board further has lugs extending from the flat surface and positioned towards opposite sides of the base board, each of the lugs having an opening for the passage of a screw. The load center housing has a lance formed from a rear wall, the lance has a free end positioned spaced apart from the rear wall and inside the housing interior to capture the tongue of the base board, the housing further has a hole in the housing. rear wall to receive a screw. As the base board is being mounted to the housing, the sloped bottom edge of the tongue is captured between the lance formed in the rear wall of the housing and the lower surface of the rear wall and the tip are engaged by an upper edge of the housing. the tab to stop vertical movement of the base board, while the lugs of the base board are placed in a butt-to-wall contact with the inner surface of the rear wall for mounting by a screw through the opening and into of the hole correspondingly positioned in the housing. The base board of the load center comprises a flat surface for receiving first and second common connecting rods, the flat surface having two substantially parallel, spaced apart wall members, integrally formed ^ n and extending substantially orthogonally upwards from the flat surface to form a double-walled barrier, continuous between the first common connection bar and the second common connecting bar. The base board of the load center comprises a surface to which a selected component of the load center is to be assembled, the surface having at least one post formed integrally for heat-stacking hammering to secure the selected component to the board of base, in which the integrally formed post has a lower cut in a toroidal shape that extends around a periphery of the post at the intersection with the surface of the base board. According to one aspect of the present invention, there is provided a neutral bar having an elongated central body portion with a trapezoidal cross-sectional area with the side walls extending downward sloping outwardly, the side walls having a plurality of openings for the insertion of wire wires, an upper portion extending from the central body portion and having a plurality of internally threaded holes in at least one of which, is in communication with a corresponding opening in the plurality of openings in the side walls and a base portion extending from the central body portion to mount the base board. The base board of the load center comprises a surface member for mounting the components of the center of charge of a channel for mounting a neutral bar having a plurality of electrical connector openings for receiving neutral return wires, the member The surface also includes an integrally formed neutral bar wire guide, comprising a wall extending vertically from the surface member, the wall having semicircular grooves extending therethrough on an upper surface, each of the grooves semicircular to receive a return wire and guide the return wire through it and into a preselected opening of the plurality of electrical connector openings in the neutral bar. An improved neutral tie rod for connecting the neutral bars of a load center together, having an outer metal housing, the neutral tie rod comprises: (a) a center portion having two laterally extending ends, vertically displaced, each end having an opening for receiving a screw to secure each one end to a neutral bar; (b) a pair of raised first members, each pair of the first raised members that are placed between the center portion and one of the ends and adapted to form a neutral, bypass wire lug having a hole placed horizontally to receive a neutral bypass wire, the neutral bypass wire lug further has an internally threaded hole that extends vertically in communication with the horizontally placed hole, the internally threaded hole extends vertically to receive a threaded fastening screw to secure the neutral bypass cable; (c) a second raised member placed between one of the pair of first lifting portions and one of the laterally extending ends, displaced vertically, the second raised member being adapted to form a neutral wire lug having a hole placed horizontally to receive a neutral wire, the neutral wire lug also has an internally threaded hole that extends vertically in communication with the horizontally placed hole, the internally threaded hole extends vertically to receive a threaded fastening screw to secure the neutral wire. The neutral connection rod can be electrically connected to the outer metal housing of the load center. An insulating main lug for an electrical load center, comprising: a first and a second longitudinally extending compartment, formed in a through manner, each of the first and second compartments comprising a horizontally placed platform from which two vertical walls extend having first edges, which form a first open end and which have second edges which form a second open end that faces opposite; a first support leg extending downward from the first edges forming the first open ends; a second support leg extending downward from the second edges forming the second open ends; the first support leg is spaced apart and substantially parallel to the second support leg to form a laterally extending space, open between them and below the platforms for placement on a neutral connecting rod of the load center.

BRIEF DESCRIPTION OF THE DRAWINGS The Fiqura 1 is a prepositive view of the loading center that incorporates the principles of the present invention; Figure 2 is a plan view of the outer housing of the load center shown in Figure.1; Figure 3 is a plan view of the cutout panel, which encloses the outer housing shown in Figure 2; Figures 4A, 4B and 4C are a top side view of an inwardly pushing screw fastener; Figure 5 is a front view of the door mounted to the trim panel shown in Figure 3; Figures 6A and 6B are perspective views of the door latch from above and below respectively; Figure 6C is a side view of the door latch; Figure 6D is a sectional view of the door lock d shown in Figure 6A, taken along the line 6d-6d; Figure 6E is a sectional view of the bolt of the door mounted to the door and secured closed to the door; Figure 7 is a perspective view, isolated from the board of b shown in Figure 1; the figure ? is a top plan view of the base board shown in Figure 7; Figure 9 is an enlarged plan view of a base or mounting leg of modular extension of the base board shown in Figures 7 and 8; Fig. 10 is a sectional view of the modular extension mounting base taken along line 10-10 in Fig. 9; Figure 11 is a sectional view of the modular extension mounting base, taken along line 11-11 in Figure 9; Figure 12 in a top plan view of a modular extension base board, for the connection to the oase board shown in Figures 7 and 8; Figure 13 is a sectional view of the modular extension base board d taken along line 13-1 in Figure 12; Figure 14 is a sectional view of a portion of the modular extension bsi board, taken along line 14-14 in Figure 13; Figure 15 is an enlarged plan view of the mounting base of the modular extension base board shown in Figure 12; Figure 16 is a sectional view of a portion of the mounting base taken along line 16-16 in Figure 15; Figure 17 is a sectional view of a portion of the mounting base taken along line 17-17 in Figure 15; Figure 18 is a sectional view of the base board d taken along line 18-18 in Figure 8; Figure 19 is a sectional view of accommodation, taken along line 19-19 in Figure 2; Figure 20 is a perspective view of the interior components of the load center in Figure 1 showing the base board with the switches removed; Figure 21 is an enlarged plan view looking down at a portion of the bas board shown in Figure 20, taken along line 21 21; Figure 22 is a sectional view taken along line 22-22 in Figure 21 showing a double wall corrugated barrier between the common connecting bars; Figure 23 is a sectional view taken along line 23-23 of the integrally formed hollow post shown in Figure 8. Figure 24 is a sectional view taken along line 24. -24 of the integrally formed solid pole shown in Figure 8, Figure 25 is a cross-sectional view of a neutral bar taken along line 25-25 in Figure 20, Figure 26 is a top view of the neutral bar shown in Figure 20, Figure 27 is a cross-sectional view of snap-fit, flexible extending vertically upwards, taken along line 27-27 in Figure 8, Figure 28 is a side elevational view of the wire guide of the neutral bar, taken along line 28-28 in Figure 8, Figure 29 is a sectional view of the neutral tie rod, taken along the length of the line 29-29 in Figure 30, Figure 30 is a top view of the dipstick neutral bond shown in Figure 20; Figure 31A is a perspective view of the main insulator tab shown in Figures 1 and 20; Firjura 31B is a top view of the main isolator orejet; Figure 31C is a sectional view of the main isolating ear, taken along the line 31C-31C in Figure 3 IB; Figure 31D is a rear elevational view of the main insulator tab shown in Figure 31A; Figure 31E is a side view of the main insulator orejet shown in Figure 31A.

DETAILED DESCRIPTION OF THE INVENTION With reference to the drawings, a car center for use in residential or commercial applications is indicated in the. Figure 1 by the reference number 1. The load center 1 includes a housing 10 a cutting panel 50, which supports the base board 2 mounted thereon, the door 80, the door lock 120, the common connection bars 400 and 440, the neutral bars 50 the neutral connecting rod 550, the main lugs 4 and 460, the neutral lug 574, the main isolation lug 6 and the distribution switches. Although not shown, the load center 1 may alternatively include a main circuit breaker in place of the main, direct lug connectors 420 and 460 which connect the input service or main lines to the components of the load-center and the which function to provide a means to interrupt the power to the load center. With reference to Figure 2, the housing 10 comprises a rear wall 12 and four integral side walls 14, 16, 18 and 20 which end in peripheral rims turned inwards 22, 24, 26 and 28 respectively, surrounding an open front of the housing 10. Housing 10 is typically fabricated from a sheet of metal in a series of operations including cutting, preforming, forming and welding. The housing 10 is typically installed between the wall posts of a construction partition, such that the open side of the housing is flush with the division of the exterior surface. The housing 10 is covered by a trim panel 50 shown in Figure 3 to adjust level with the housing and division. The trim panel 50 is attached to the housing 10 with fasteners, such as screws, which pass through the holes 52 formed in the trim panel and peripheral ridges 22 and 26 of the side walls 14 and 18 shown in FIG. Figure 2. The cutting panel 50 has an articulated access door, secured by a bolt which allows access to the interior of the load center, to allow the manipulation of the user manipulating the switch actuator located in the load center. When installing a trim panel for a prior art housing, the electrical generally has to align the holes formed in the trim panel with the corresponding holes located in the housing, insert the screws through the aligned holes and screw each screw in the housing. This work is time consuming and often is not successful in the first attempt and has to be repeated several times. In accordance with one aspect of the present invention the housing 10 is adapted to receive and is fitted with a fastening attachment of a thrust screw, which allows an electric fasten the trim panel 50 to housing 10 by pushing only one screw through the opening 52 in the trim panel and within the fastener of the thrust screw mounted in a housing flange With reference to Figures 4A, 4B and 4C, push screw fastener 40, there is shown and comprises an open end, a "U" shaped structure, formed of a single piece of sheet metal, where the U shape is bending the sheet of metal to form a surface 41 and two side walls 43 extending from the top surface. The upper surface 41 has d projections 42 directed outwards. An opening 49 of u "ií ^ Stm. single way s in the upper surface 41 by two tabs 44 directed inwards and downwards, as discussed more fully in the following, to receive a threaded fastener. On each of the opposite side walls 43 there is a separate cutting tab 46 directed outwards and upwards. An attachment 40 of the thrust screw is inserted into the corresponding holes 10 correspondingly in the flanges 22 and 26 (shown in Figure 2). The outwardly extending projections 42 help in securing the push screw holder 40 in place, in the hole 30 in the housing holding the edges of the hole 30 between the outwardly extending projections 42 and the tabs 46 directed toward up and in At the time of installation of the trim panel 50 to the housing 10, the openings 52 of the trim panel are aligned with the push screw fasteners 40 in the shoulders 22 and 26 of the housing 10, and a screw is pushed through each of the openings 52 of the clip of the trim panel and within the one-way opening 49 in each of the push screw fasteners 40. The cutting tabs 44 separated inwardly and downwardly from the push screw holder 40, act as fingers of a loaded spring or spring springs, the Idles * -which are deflected by the axial pressure that is exerted by a screw that is pushed into the push screw holder. The free edges 47 of the tabs forming the opening 49 engage the screw threads so that they prevent linear withdrawal (i.e., pulling screw outward in the direction opposite to the insertion direction) -in rotation of the screw in one direction opposite to the hands of the clock. In the case of an overpressure condition of a center load, which can be caused, for example, by a short circuit fault, the door of some designed car park centers of the prior art can be caused to blow up. the door. More specifically, the door may be arched outwards which may cause the door to be locked and therefore the bolt mounted to the door of the prior art designs to move away from the coupling with the lock receptacle generally located in the shelter until the bolt the door becomes uncoupled from the hill receptacle allowing the door to be opened pushed by poor pressure condition. According to one aspect of the present invention, an improved new bolt is provided which, during an overpressure condition within the load center, causes the bolt to engage the bolt receptacle on the guard still m securely, so that the Door does not undock and open. With reference to Figure 5, the door 80 is shown mounted to the trim panel 50 by the hinges 82. Mounted on the surface 84 of the door 80 is the door lock 120 shown in Figure 6A. The door latch 120 is a one piece molded member, comprising an upper part 122 having an indentation 124 for coupling the operator's finger to open and close the bolt 120. The bolt opening 120 is made by the latch bolt. the sliding door 120 along the surface 84 of the door 80. As shown in Figure 6E. , extending from the lower side 126 of the upper part 122 is a body portion 128, which has a flexible tongue (or a spring-like biasing member) 132, which extends in an upward direction from a lower portion. of a side wall 130 of the body portion 128. Extending separately from the bottom side 126 of the top 122 there is generally a fixed "L" -shaped hook (or jaw) 134. The free end 136 of the hook 134 extends laterally in the direction of the tongue 132. The door 80 has a first cut or opening 86 (shown in Figure 5) sized to allow the body portion 128 of the bolt 120 to pass through the door 80. As shown in FIG. In Figure 6E, there is a flange 90 on the door 80 formed by the flexing of the metal cut by the lances for the flange 90. The tongue 13 rests on the flange 90 of the door 80. The lower lad 126 of the part higher 122 is placed on the surface of the front part of the door 84. The latch d retainer 138, shown in Figure 6D, which extends from the lower side 126 of the bolt 120 is positioned against the depression 92 of the first cut. 86, as shown in Figure 5. A second cut 88 in the door 80 is dimensioned to allow the fixed hook "L" to pass through the door 80. The body portion 128 of the lock door 12 is adapted to form a track 144 on each of the two side walls 140 to allow the lock 120 s to slide along the surface of the front of the door 84 guided by the edges 94 (shown in the Figure 5 of the first cut 86 of a coupled position shown by Figure 6E to a decoupled position. Extending from each of the lateral walls 140 of the body 128 are the inverted "C" shaped projections. The pistons 144 are formed between the lower 126 of the upper part 122 and the upper edge 14 of the projections 142 formed in inverted "C". The inverted "C" shaped 142 projections fit into the notches ">6 shown in Figure 5 in the first cut 86. After installation of the door lock 120 in the door 80, the inverted "C" shaped projections 142 are not aligned with the notches 96, which therefore prohibit the removal of the door lock 120 from the door 80. With reference to Figure 6E, the door 80 is shown secured in a closed position and locked by the door lock 120 with the hook 134 in the "L" shape, the which passes through the second cut 88 in the door 80 and through an opening 54 in the cut panel 52 (Figure 3) for coupling the edge of the lower side 55 of the opening 54. To uncouple the bolt 120 from its inactive closed position to allow the opening of the door 80, the operator places his finger on the indentation 124 of the upper part 122. and slides the bolt towards the "free" end of the door 80 (that is, in a direction away from the door joints). As the bolt 120 slides along the surface 84 towards the free end of the door 80, the flexible tongue (or base member) 132 is compressed against the flange 90 thereby causing the hook 134 in the form of "L", which extends from the lower side 126 of the bolt 120 and which is with the surface inward, towards the hinges 82, to move out of engagement with the lower side 55 of the door 80 formed around the opening 54 and in vertical alignment with an opening '34, e such that the hook 134 in the form d "L" can freely pass through the opening 54, by which it allows the opening of the door 80. The '-rocket 120 is held in a position locked by the flexible tab 132 pressing against the flange 90. The pressure of the flexible tab 132 against the flange 90, which holds the bolt 120 in a closed position, is maintained by a detent 138 extending from the bottom side 126 of the c 50. In this way, the lock 120 is in a closed, deflected position and since the L-shaped fixed hook 134 is facing inwards, towards the hinges 82 of the door 80, the bolt 120 remains in a closed position, still deflected if the door 80 flexes outward during an overpressure condition d within the load center 1. Placed inside the housing 10 there is a base table 200 to which the various components of the center of the housing are mounted. load. The base board 200 is made of electrically insulating material, which can be injection molded or extruded. An example of such material is thermoplastic material sold under the trademark Nory by General Electric Company. Since load centers are built by a manufacturer in various sizes, or separate inventory of base boards have to be manufactured and maintained for each size of the load center To decrease •• > ! and the need to maintain various sizes and base boards, an extruded base board of the kind described in U.S. Patent Nos. 4,449,296 entitled "Method of Forming Electri Distribution Panel", 4,536,823 entitled "Electric Pane Board Having? n Improved Extruded Basepan Configuration "4,740,865 entitled" Extruded Three-Phase Basepa Configuration for a Load Center "and 5,081,560 entitled" Loa Center Enclosuro "were introduced. Also, one or more parts of the auxiliary, modular, individual base board has been constructed for interconnection to form centers of adjustable length switch load. Such modular base board parts are shown in the Patents of the United States Nos. 4,646,198, 5,450,282 and 4,251,851. Due to the difficulties involved in the robotic assembly of the components of the load center, which require angular assembly, particularly molded base boards and modular extensions to provide variable length base boards and due to the difficulties in Assembling or securing the components to the base board, the modular extensions have been designed and manufactured in the prior art to avoid the need for angular mounting. That is, the modular extensions have been adapted to be loaded vertically down to engage the portions of the base board or have been adapted to be connected horizontally or laterally to couple the portions of the base board. Such joining methods of the prior art and modular constructions experience the possible misalignment and inadequate separation between the connected pieces., which may affect the subsequent assembly and installation of the components to the base board. Therefore it would be an advantage over the prior art to have components of the modular extension base board, which have not been assembled solely in either a downward, vertical or a laterally connected mode, which reduces the possibility misalignment and inadequate separation between the modular pieces connected, and which, however, can be assembled robotically. With reference to Figures 7 and 8, there is provided a pressure adjusting base board 200 having a surface 202 on which the common connection rods 400 and 440 are to be mounted and the switch support rails 204, from which the hooks 206 of the switch support extend for the mounting and support of the switches. Each of the rails 204 of the switch bracket has an upper end wall 208 and a lower end wall 210. According to one aspect of the present invention, an improved base board 200 is provided, which has a mounting base 212 of modular extension, which extends from the lower end wall 210 and on which a modular extension base 300 board (shown in Figure 12) can be mounted to extend the length of the press fit base 200 board and thus allowing a larger number of switches to be installed within the load center 1. The modular extension base board 300 is also made of an electrically insulating material, which can be injection molded or extruded such as Noryl. With reference to Figures 9 and 10, the modular extension mounting base 212 is in the form of a rectangular, hollow box having an upper wall 214, two side walls 216 and 218, the front wall 220 and a formed back wall. by the lower end wall 210 of the support rail 204 of the switch. Extending between the modular extension mounting base 212 and from the lower edge of the surface 202 is a depressed platform 240 for mounting a slotted edge 332 for engagement of the upper surface 302 of the modular extension base board 300. The trapezoidal shape alignment groove 222 formed in the upper wall 214 and the side wall 218 of the base 212 (shown in Figure 9 and better seen in Figure 11) is provided to be coupled by a shaped alignment ramp 304 correspondingly of the modular extension 300 base board (shown in Figure 13 and better seen in Figure 14) and therefore pull the modular extension 300 base board towards and align it with the pressure adjusting 200 base board , when the modular extension 300 base board is mounted to the press fit base 200 board. This suitably places the modular extension base board 300 to the press fit base board 200 to secure them together as described more fully in the following. To secure the modular extension base board 300 to the press fit base board 200, the top wall 214 of the mounting base 212 has an opening 224 to allow a flexible, snap hook 306 (Figures 13 and 14). ) of the modular extension base board 300, pass and engage an upper edge 211A of the slot 211 formed in the end wall 210 (Figure 10) of the support rail 204 of the switch, when the modular extension 300 base board is mounted to the pressurized fastener base board 200. The modular extension base board 300 is configured to be substantially similar to the press fit base board 200 in providing, for example, an upper surface 302, the support rails 308 of the switches, the switch support hooks 310, the barrier 334 of the corrugated, double-walled common connection bar, formed integrally with the solid posts 342 and formed integrally with the po stes 344 hollows and mounting tabs 336 (for mounting the pressure adjusting base board 200 and the modular extension base board 300 to the metal housing 10 (Figure 12). The modular extension 300 base board includes 308 switch support rails, which have a cross sectional shape of an inverted "U" (Figures 13 and 14). On an inner wall 312 of the switch support rail 308 at the proximal end of the modular extension base board 300, which is to be attached to the lower end of the base board 200, is a trapezoidal alignment ramp 304 ( Figures 13 and 14) which is complementary in form and size to the alignment slot 222? trapezoidal shape and positioned in such a way that the modular extension base board 300 is mounted to the press fit base board 200, the trapezoidal ramp 304 is guided by the trapezoidal groove 222 initially in a downward direction or a direction in the Z plane (shown by the arrows "Z" in Figure 7) and then laterally or horizontally in an X direction (shown by the arrows "X" in Figure 7). This causes the modular extension base board 300 to be brought into abutting contact alignment with the press fit base board 200. At the same time, the adjustment hook 306. flexible (Figures 13 and 14) passes through the hole 224 (Figure 9) / engages the edge 211A of the slot 211 (Figures 10 and 11) in the lower end wall 210 of the switch support rail 204, so that the base board 300 of modular extension to the base board 200 of press fit is secured. The result of causing the modular extension base board 300 to move in both of a vertical Z direction and virtually simultaneously in a horizontal X direction during the mounting of the modular extension 300 base board, before securing it to the control board. 200 pressure adjusting base, there is a closer and safer fit between the modular extension 300 base board and the pressure adjusting 200 base board, which in turn allows for the assembly of the components of the center of load on the assembled base board. The distal end of the modular extension base board 300, the end of which is further apart from the lower end of the pressure adjusting base board 200, is configured to be substantially identical to the lower end of the press fit base board 200. This configuration allows the successive joining of the base boards 300 of modular extension with each other. In this way, with reference to Figure 12, the base board 300 of modular extension, has at its distal end two mounting legs 314 < 1. "modular extension, each in the form of a hollow rectangular box having an upper wall 316, two side walls 318 and 320, the front wall 322 and a rear wall formed by the end surface 309 of the support rail 308 of the switch. A trapezoidal alignment slot 324 is formed in the upper wall 316 and the side wall 320 in the mounting legs 314 (Figures 15 and 16). The top wall 316 has an opening 326 and an end wall 309 of the switch support rail 308, has a slot 328 having an upper edge 328A (as does the modular extension mounting base 212 of the base board 200) . Extending between the modular extension mounting legs 314 is a platform 330 depressed. These elements and features of the press-fit base board and the modular extension base board facilitate the robotic assembly with each other, while providing a secure fit between them. According to another aspect of the present invention, the portion of the housing to which the base board is to be secured and a corresponding portion of the base board, which is used to secure the base board to the housing, are improved to decrease the costs of its manufacture and facilitate the assembly of the base board to the housing.

With reference to Figures 7 and 8, the base board 200 pe shows having lugs 226 placed on opposite sides and each lug has an opening 228 for mounting by a screw to an orifice 32 correspondingly positioned in the housing 10. The panel Press fit base 200 is also provided with tabs 230 extending laterally from outer wall 209 of each switch support rail 204 (Figures 8 and 18). Each tab 230 has a lower edge 232 inclined to capture between a lance 34 formed in the rear wall 12 of the housing 10 and the inner surface of the rear wall 12. The tongue 230 has a tip 234 extending laterally from a side edge, which is stopped by the upper edge 36 of the lance 34, whereby it stops the vertical movement of the base board 200 as < = installed in housing 10 (Figure 2). The lances 34 are stamped or cut from the rear wall 12 of the housing 10 and flex within the interior of the housing 10 as shown in Figure 19. The free ends of the lances 34 face each other and capture the lower edge 232 inclined of the tongue 230, when the liase board 200 is being installed inside the housing 10. The tips 234, which extend from the side of each tab 230 are engaged by the upper edge 36 of the lances 34 to stop the vertical movement of L base board 200 during the installation of the base board to the housing 10, while the lugs 226 of the base board 200 are placed in abutting contact with the inner surface of the rear wall 12 of the housing 10. The modular extension base pad 300 is also provided with the tabs 336 extending laterally from the wall outer 311 of each switch support rail 308 (Figure 12) and are in any other structurally and functionally the same manner as the tabs 230 of the press fit base board 200. Each tab i 36 has a sloping lower edge 338 and a tip 340 extending laterally from the side edge 311 to capture between a lance 34 and the inner surface of the rear wall 12. When the base board 300 modulating extension has Assembled and secured to the pressurized base board 200, the tabs 336 and tabs 230 are captured by the lances 34. The base board 300 of modular extension, assembled and the base board 200 of snap fit is installed inside and secured to the LO housing in the same way that the base board 200 is only installed in the housing 10. The free end of the lance 34 captures the lower edge 338 inclined and the upper edge 36 stops the vertical movement of the board. base 200 by the capture of the tip 340. The openings 228 in the lugs 226 are brought into alignment with the holes 32 correspondingly positioned in the rear wall 12 and receive a screw, which retains the upper end of the base board 200 to the housing 10. The common connection bars 400 and 440, which function to interconnect the supply line with the distribution switches, have common connection bars 402 and 442, flat with integrally formed tongues or contact blades 404 and 444, respectively. The tabs 404 and 444 extend in parallel planes perpendicular to the longitudinal axis of each common connecting bar and are aligned in a row in a face-to-face relationship, interspersed as shown in Figure 20. The distribution of the switches are electrically connected. to the free end 406 and 446 of the tabs 404 and 444, respectively, and are supported on the base board 200 at one end by the switch support rail 204 and at its other ends by the barrier 250. The free ends 404 and 446 of each of the tabs 404 and 444 are mechanically and electrically connected within the recesses in the distribution switches and prevent a short line to line between a tab of the common busbar 400 from occurring to a tab of the busbar common 440. Since the placement of the distribution switches on the tabs of the common connection bars = 5-can not avoid the possibility of a short line-to-line occurring between a common busbar to the other common busbar, it is known in the art to provide an electrically insulating barrier, between common busbars, which increases the distance of the short circuit path, thus decreasing the possibility that a short will occur. According to one aspect of the present invention, an electrically insulating, wavy, double-walled barrier 250 between the common connecting rods 400 and 440 is provided, which increases the protection of a short occurrence, as well as decreases the possibility to hold the short, once it has happened. With reference to Figures 20 and 21, the electrically insulating, wavy, double-walled barrier 250 is shown as consisting of the walls 252 and 254 integrally formed with and extending substantially orthogonally upward from the flat surface 202 of the base board 200. and are placed on the base board 200 to provide a double-walled physical barrier, continuous between the common connecting rods 100 and 440. The electrically insulating, wavy, double-walled barrier 250 doubles the distance an arc must move between common connections 402 and 442 flat, which decreases the possibility that the arc track may occur when compared to the prior art devices. In addition, doubling the distance that an arc must travel, also decreases the possibility of tracking the arc, once it has occurred, that is capable of reoccurring. The trajectory of the circuit that the arc must displace on and around the walls 252 and 254 of the barrier 250 as represented by the dotted line in Figure 22, also decreases the possibility that an arc will follow the track due to the length of the arc. the path that follows the track of the potential arc. Common connection bars have been secured to the base board by common fastening devices such as screws, bolts and snap fasteners (US 4,536,823) which can be tedious, time-consuming, non-economic, require extra parts and more Importantly, it can impart stresses to the component that is insured and adversely affect the structural integrity of the base board. The application of ultrasonic energy to the poles, which are integral parts of a plastic base board as a means of deforming the post to secure the common connection rods to the plastic base board is well known (United States Patent 4,118,754). Stacking with heat as a means of securing the components to a plastic base board may be advantageous in understanding the disadvantages set forth in the above common clamping devices, but imparts stresses which are concentrated on the surface of the board. base, where the base of the pole intersects the base board to form corners. Such tension can significantly damage the integrity of the connection leading to a fracture of the post, loss of the integrity of the connection and a decrease in the service life of the base board and the load center. According to one aspect of the invention, there is provided an improved base board having integrally formed poles for securing to them components such as common connecting rods and the like by heat stacking, whose improvement avoids imparting stresses to the poles. With reference to Figure 8, the base board 200 is shown having integrally formed solid poles 242 and hollow 244 oosts integrally formed for the mounting of the common connecting rods 400 and 440. With reference to Figure 23 (which is a sectional view of a hollow post and the base board), the hollow post 244, which is formed integrally with the surface 202 of the base board 200, is shown having a lower cut 246 in a toroidal shape extending around the periphery of the hollow post 244 at its intersection or junction with the surface 202. The lower cut 246 of toroidal shape eliminates the pointed corners in the interconnection or joint between the hollow post 244 and the surface 202, so that it reduces the concentration of the tension, which can make the hollow post 244 susceptible to the fracture of the surface 202, due to heat stacking. As shown in Figure 24, the solid post 242 similarly has a lower cut 246 of toroidal shape, which extends around its periphery at its intersection with the surface 202. The lower cuts 346 of toroidal shape are similarly provided with posts 342 integrally formed solids and hollow poles 344 integrally formed from the modular extension 3Q0 base board (Figure 12). With reference to Figure 20, the divided neutral bars 500 each of which constitute a common electrically conductive joint for the connection of the return wires of the distribution circuits to the return of the main power line are shown mounted on the channels 260 of the base board 200. According to one aspect of the present invention, to improve the visibility of the openings of the electrical busbar of the neutral bus in which the return wires of the distribution circuits are to be inserted and secured , and therefore facilitates the connection of the return wires to the neutral bars by the electric installer, each neutral bar has a central portion having a cross-sectional area in generally trapezoidal shape with the side walls inclined outwards. Such a configuration allows the observation of the openings of the electrical connector placed on the side walls of various positions, either as orthogonal or directly above, or from the side. With reference to Figure 25, which is a cross-sectional view of the neutral bar 500 shown in Figure 20 taken along the line 25-25, the neutral bar 500 has a central body portion 510 having a cross-sectional area in generally trapezoidal shape, with the side walls 512 and 514 inclined outwards. The openings 516 of the electrical return wire connector are provided in the side walls 512 and 514 of the neutral bar 500. The upper portion 502 of the neutral bar 500 has an upper wall 504 through which a series of threaded holes 506 internally are provided, each of which is in communication with the opening 516 of the return wire connector correspondingly positioned. Placed inside each threaded hole 506 internally there is a fastening screw 508, threaded to secure the return wire to the neutral bar. The placement of the openings 516 in the side walls 512 and 514 of the body 510 of the cross-sectional area of generally trapezoidal shape of the neutral bar 500, allows the installer of the field to easily visually correlate the particular opening within the which a corresponding electric return wire is to be inserted and subsequently secured by a clamping screw 508. In this way, as shown in Figure 26, when observing the neutral bar 500 orthogonally (i.e. directly above) as shown , for example in the upper view of the neutral bar 500 with the screws 508 removed, each of the holes 506 threaded internally in the upper wall 504 and each of the openings 516 of the electrical connector correspondingly positioned in the side walls 512 and 514 they are easily observed and located, so they facilitate the proper insertion and connection of the return wires to the neutral bar. According to one aspect of the present invention, the neutral bar 500 is also adapted to allow simplified assembly and mounting of the base board 200 which does not require the use of screw or other separate fastening devices, thus reducing the number of components in the load center. Referring again to Figure 25, extending from the central portion 510 of the neutral bar 500 is a base 520 adapted to have a "T" shaped slot 530., formed by the space between two mounting rails 522 and 524, which receives the securing means integral with and extending upwards from is channels 260 of the base board 200. With reference to Figures 7, 8 and 20 , the securing means of the base board 200 comprises; upwardly extending alignment blocks 262, which fit within the space between the mounting rails 522 and 524 to align the neutral bar 500 within the channel 260 and the flexible upstanding extension hooks 264 and 266 (Figure 27) which press fit the flanges 526 and 528, respectively, of the mounting rails 522 and 524 (Figure 25) to join the LOO neutral bar to the base board 200 in a bolted manner. The neutral bar 500 at the same time. both can be quickly and easily mounted to the base board 200 and is retained in place without the need for any additional fastening devices. Although the neutral bar 500 can be manufactured as a molded or cast member, unitary in a preferred embodiment, the neutral bar 5) 0 is made of an extruded metal such as aluminum. To further facilitate the installation of the return wires to the neutral bars of the load center according to one aspect of the present invention, a neutral bar wire guide is provided, which helps the electrician or installer in sending the wires of Return of the distribution circuits in the openings of the electrical connector n 1 S neutral bars. As shown in Figures 7, 8 and 20, formed integrally with the base board 200 there are two guides 270 of wire of the neutral bar, each of which comprises a wall 272 that extends vertically upwards from the surface of the 200 base board at the edge of the channel 260 and having semicircular grooves 276 extending through the wall 272 on the upper surface 275 between the outer surface 273 and the inner surface 274, where each semicircular groove 276 are separated from each other by the teeth 277. The structure appears as a serrated edge (Figure 28). Each semicircular slot 276 is positioned to receive a neutral return wire and guide the end of the wire through the slot 276 of the outer surface 273, passes to the inner surface 274 and into an aperture 516 of the preselected electrical connector in the neutral bar 500 (Figure 20). The neutral bar 500 is placed in the channel 260 of the base board 200, such that each of the openings 51G of the electrical connector, which receive a neutral return wire are aligned with a corresponding slot of the semicircular grooves 276 in the wire guide of the neutral bar 270 as shown in Figure 20. The alignment of the semicircular grooves 276 in the wire guide 270 of the neutral bar with the openings 516 electrical connectors in the neutral bar 500, also helps the installer electrical in locating the openings 516 of the electrical connector and reduces the time required to connect the neutral return wires. The teeth 277 of the wire guide 270 of the neutral bar function to assist in maintaining the electrical insulation between each neutral wire and the ground. The use of the neutral bar 500 having a trapezoidal cross-sectional area with the easily observable electrical connection openings 516, combined with the guide 270 of the neutral bar wire having semicircular grooves 276, which are aligned with the electrical connection openings 516 of the neutral bar 500, particularly facilitates the connection of the neutral return wires to the neutral bar by the electrical installer. An improved neutral connecting rod 550 which connects mechanically and electrically with the neutral bars 500 together is provided in accordance with one aspect of the present invention. With reference to Figures 20 and 30 (which is a top view of the neutral bond rod 550 shown in Figure 20 with the other components removed for clarity of illustration), the neutral tie rod 550 is an electrically conductive member for electrically connecting the neutral bars 500 and has a central portion 552 yet emos 564 and 566 extending laterallyvertically displaced which are connected by the screws 570 through the openings 568 and within the corresponding internally threaded openings 506 in each of the neutral bars. 500. With reference to Figure 29 (which is a sectional view taken along line 29-29 in Figure 30), the tie rod 550 is shown as comprising a first raised member 554 positioned between the portion central 552 and each end 564 and 566, which are adapted to form a cable lug 556 for receiving, in a horizontally positioned hole 558, a neutral bypass wire, which is not secured therein by threaded fastening screw 562 inside the internally threaded hole 560 extending vertically. Extending between the first raised member 554 and the end portion 566 there is a second raised member 572, which is adapted to have a neutral cable lug 574 for receiving in a horizontally placed hole 576 where the neutral wire enters which is going to to be secured therein, by the fastening screw 580, threaded with the hole 578 threaded internally. The neutral tie rod 550 is secured to the base board 200 by heat stacking the hollow post 238, which extends upwardly from the base board 200 through the opening 582 (Figures 7 and 8). . In some applications in which the neutral bar of the load center is not connected or has not been connected to an external earth bar and therefore has not been electrically grounded, there is a need to ensure that there is no difference of potential between the neutral bar and the ground. According to one aspect of the present invention, in order to eliminate any potential difference between the neutral bar and the earth of the load center, the neutral connecting rod 550 is adapted to be able to be electrically connected to the outer metal housing 10 of the load center. Since each power company that provides the service keeps the potential of the neutral bar at or close to zero volts, the function of connecting the neutral bar of the load center to the ground is performed by electrical connection of the neutral union rod. to the outer metal housing. With reference to Figure 29, the neutral connecting rod 550 is adapted to have a abeam 586 to accept a fastener (not shown) which passes through an orifice correspondingly positioned in the hollow post 248 in the base board 200. (Figure 8) and within an orifice 38 correspondingly positioned in the housing 10 (shown in Figure 2). Although the neutral tie rod 550 can be manufactured as a unitary or molded member or by cast metal in a neutral tie rod 550, the preferred embodiment is made of extruded aluminum. Typically a removable barrier is provided between the main lugs of the incoming service, which connect the incoming service or main lines to the load center and the rest of the components in the load center. According to one aspect of the present invention, a new, improved, and improved main liner 600 is provided to separate lugs from the main line from the rest of the components at the load center. The improved insulating main lug functions to: (a) isolate each of the main lugs of the neutral tie rod and the neutral lugs; (b) reduce incidental short-circuiting or inadvertent energization of current carrying conductors, both during field installation as well as subsequent operation; and (c) maintaining above the required surface and separation through the air for cooling and expansion of the main lugs. The main insulator tab 600 is an integrally formed member made of an electrically insulating material, which can be injection molded or extruded. With reference to Figure 31, which is an isolated perspective view of the main insulator tab shown in Figure 20, the main insulator tab 600 What is the difference between the main tabs 420 and 460, respectively? Each compartment 610A and 610B are formed of a platform 612 from which extend two vertical dividing walls 614 and 616 having open ends 618 and 20 facing opposite each other. The open ends 620 provide access for the reception of the connector 08 and 448 of the common connection bar and the open ends 618 provide access for the reception of the ends of the power cables (Figure 31B). The platform 612 of each compartment has a slot 638 that extends transversely for receiving a rail on the underside of the main lugs 420 and 460 to facilitate the placement of each lug within each compartment. Extending down from the edge of each open end 618 and down from the edge of each open end 620 are the substantially parallel support legs 622 and 624, respectively, which connect the compartments together laterally and which elevate each compartment vertically ( Figures 31A, 31C and 31E). The legs 622 and 624 are spaced apart to mount the width of the neutral connecting rod 550 and the suspended compartments 610A and 610B transversely, on the neutral connecting rod, when installed on the base board 200. The 622 leg has a bracket 628 mounting, which extends transversally from there and is heat stacked to secure the main insulation tab 600 to the pole 280 on the base board 200. The leg 624 has a surface 625, which extends laterally between the two compartments 610A and 610B. Extending from the underside of the platform 612 of each compartment, are the bars 636 which are positioned in such a way that when the main insulator lug 600 is installed in the load center, the bars "36" engage the slots 584 placed and correspondingly shaped in the neutral tie rod 550. This functions to maintain the position and alignment of the neutral tie rod together with the main insulator tab for heat stacking assembly, it also extends from the underside of the platform 612 and the outer surface 630 of the vertical walls 616 of each of the compartments there is an alignment member 632, which forms a slot 634 with the leg 624. When the main insulation tab 600 is installed inside the base board 200, the slot 634 engages the edges 284, 286 and 288 of the vertical barrier member 282 of the base 200 blc (FIG. 7), which terminates the barrier between (a) the Main jets and common connecting rod connectors and (b) the neutral lugs and the neutral connecting rod as shown in Figure 20. Although the above description and the drawings represent the preferred embodiments of the present invention, it will be apparent for those skilled in the art, various changes and modifications may be made therein without departing from the true spirit and scope of the present invention.

Claims (12)

1. An electrical load center having a neutral bar and a base board for mounting the neutral bar, wherein the improvement is characterized in that it comprises a neutral bar that it has; an elongated central body portion with a trapezoidal cross-sectional area, with side walls extending downwardly, tilting outwardly, the side walls having a plurality of openings for the insertion of electrical wires; an upper portion extending from the central body portion and having a plurality of internally threaded holes at least one of which is in communication with a corresponding opening of the plurality of openings in the side walls; and a base portion extending from the central body portion for mounting to the base board.

2. The improved electric charge center according to claim 1, characterized in that the base portion of the neutral clamping bar further includes mounting rails which are adapted to form between them a slot in the generally T-shape and in which the board The base further includes a securing means formed integrally and extending up therefrom to secure the mounting rails to the base board.

3. The improved electric charge center according to claim 2, characterized in that at least one of the mounting rails has a flange and the base securing means comprises at least one flexible snap-fit hook, which extends upwards for the flange coupling of at least one mounting rail.

4. The improved load center according to claim 3, characterized in that the securing means of the base board for securing the neutral bar thereto further includes an alignment block extending upwards for positioning between the mounting rails of the neutral bar.

5. The improved load center according to claim 1, characterized in that the neutral bar is formed of extruded aluminum.

6. A load center, characterized in that it comprises a housing, a base board mounted inside the housing, neutral bars placed inside the housing to form a common electrically conductive joint for the connection of the return wires of the distribution circuits to a line of main return power, each neutral bar has a central core of a generally trapezoidal shape with sloping walls outwardly, a plurality of openings of a return connector, electric provided in the side walls, an upper wall of the neutral bar having a series of holes correspondingly positioned in relation to the plurality of openings of the return wire connector, clamping means accepted therein to secure a return wire to the neutral bar, whereby the central core of generally trapezoidal shape provides visual correlation that each connector opening selected suitably contains sequentially secure the selected electric return wire.

7. The load center according to claim 6, characterized in that the holes are internally threaded holes and the fastening means are threaded fastening screws.

8. A load center, characterized in that it comprises a housing, a base board mounted within the housing, at least one neutral bar mounted to the base board, the neutral bar has a pair of mounting rails defining a slot between them, the which extends from a lower surface of a central portion of the neutral bar, the base board has alignment blocks that extend upwards, which are sized to fit within the slot between the mounting rails, the base board in addition it has mounting means of press fit that extend upwards, which attach to the mounting rails to hold the neutral bar to the base board.

9. The load center according to claim 8, characterized in that the neutral bar is manufactured as a unitary, empty member.

10. The load center according to claim 8, characterized in that the neutral bar is manufactured as a unitary molded member.

11. The load center according to claim 8, characterized in that the neutral bar is manufactured as an extruded member.

12. The load center according to claim 8, characterized in that the press fit mounting means is at least one snap hook. SUMMARY An electrical charge center (1) having a housing (10) with a push screw fastener accessory (40), a door latch (120) comprising a one piece molded member, having a flexible tongue (132) ) which pushes the door latch towards the edge of the hinged door by keeping a hook (134) engaged in a deflected manner with an edge (55) of the underside of the guard, a neutral bar (500) having a portion. of elongated body (510) with a cross-sectional area of trapezoidal shape with the side walls (512, 514) extending downward, with outwardly inclined having openings (516) for the insertion of electric cables, a rod of neutral union (550) adapted to be electrically connected (586) to the housing (10, 38) of the load center, a main insulating lug (600) having compartments (610A, 610B) extending longitudinally in a through and first and second support legs (622, 624) to place on the neutral tie rod (550), a base board (200) having a surface (202) with posts (242, 244) integrally formed with a lower cut (246) extending around its periphery to secure a component of the load center to the surface by heat stacking, the surface (202) has two wall members ( 252, 254) formed integrally, spaced apart that extend upwardly from the surface forming a barrier (250) between the common connecting rods (400, 440) of the load center, the surface (202) having a tongue (230). ) with an inclined lower edge (232) and a tip (234) extending from a lateral edge of the tongue to capture by the lances (34) found in the housing of the loading center, the surface (202) having a neutral bar wire guide (270), comprising a wall (272) extending upwardly from the surface member and having semicircular grooves (276) extending therethrough on an upper surface (275) for receiving and guiding a return wire in an opening (516) ) on the neutral bar (500), the surface having a base (212) for the modular extension assembly extending from the lower end wall (210) of a support rail (204) of the switch for receiving a modular extension base board (300), the mounting base (212) has a shaped, trapezoidal groove (222) for coupling by a ramp (304) correspondingly formed of the base board ( 300) of modular extension, the modular extension mounting base (212) further has a slot (222) for receiving a flexible attachment hook (306) from the modular extension base board (300) to secure the base board ( 300) of modular extension to the base board (200).