JP6349220B2 - Distribution board - Google Patents

Description

  The present invention relates to a distribution board capable of measuring a power supply voltage supplied to a branch switch.

  The distribution board is composed of a main switch, a bus connected to the secondary side of the main switch, an internal device such as a branch switch connected to the bus, and a cabinet for housing these. For example, it is used as an entrance device for an electric circuit in a house or the like. In recent years, electric appliances used in homes require a dedicated circuit for power supply, and devices that are directly wired and connected to the branch switch are increasing. For example, a 24-hour ventilation system, a built-in type dishwasher, and the like are applicable.

  Many electric devices that require such a dedicated circuit require a power supply voltage of 200V, and a three-wire bus is connected via a main switch from a single-phase three-wire circuit (100 / 200V). There is known a distribution board that enables selection and switching of a power supply voltage to be used on the pull-in / branch switch side. As described above, since the power supply voltage can be selected and switched on the branch switch side, an overvoltage may be applied to the electric device or a supply voltage to the electric device may be insufficient due to an incorrect wiring or the like.

  Patent Document 1 discloses a housing having a power supply voltage measurement structure capable of confirming a voltage supplied to a load circuit with good workability before turning on an operation handle of a branch switch having a plug-in terminal structure. A distribution board is disclosed.

JP 2011-142800 A

  By the way, with recent diversification of power generation methods and power reception methods in houses, etc., and diversification of power supply methods for electrical equipment, the need for an increase in the number of branch switches and the installation of multiple distribution boards has increased. It is desired to reduce the size of distribution boards for residential use and expansion.

  The power supply voltage measurement structure of Patent Document 1 is configured to measure the power supply voltage applied between the plug-in terminals of the branch switch, but the bus side voltage measurement unit is provided on the buses of the two voltage poles. Each must be provided. Generally, an insulating cover is attached to the bus bar of the distribution board in order to prevent an electric shock or the like. However, in the distribution board of Patent Document 1, the area including the bus side voltage measurement unit is covered with the above cover. It is necessary to cover. Therefore, in the distribution board of Patent Document 1, the cover is enlarged in the width direction and / or thickness direction of the distribution board by the area of the bus-side voltage measurement unit, or the width direction of the distribution board itself. There is a problem that the size of the camera becomes larger.

  In view of the above points, the present invention has a function of measuring the power supply voltage applied between the connection terminals of the branch switch before turning on the operation handle of the branch switch, and the workability of the power supply voltage measurement is improved. The purpose is to realize a downsized distribution board while ensuring the above.

  A distribution board according to the present invention includes a bus group including buses of first voltage line, second voltage line, and neutral line having different potentials, and a bus bar housing body that stores the bus bar group. The first voltage line, the second voltage line, and the neutral line can be accessed from the surface side of the bus housing body through the opening provided in the body.

  That is, according to one aspect of the present invention, a bus group including a bus of a first voltage line, a bus of a second voltage line, and a bus of a neutral line having different potentials, and a box-shaped bus storage in which the bus group is stored. A distribution board having a body and a plurality of branch switches connected to the bus group, each branch switch having a switch side connection terminal to which the bus group is connected to one side surface in a longitudinal direction And the plurality of branch switches are arranged side by side in the width direction of the branch switch so that the switch-side connection terminal and one side surface of the bus housing body are opposed to each other. Each bus has a bus-side connection terminal that can be connected to each of the connection terminals of each branch switch on one side of the bus housing, and the bus container includes a longitudinal direction of each branch switch. Of the bus housing on the extension of A first opening that allows access to the first voltage line, a second opening that allows access to the second voltage line, and access to the neutral line are provided on a surface orthogonal to the side surface. And a plurality of the openings are provided so as to be aligned in the width direction of the branch switches at positions corresponding to the branch switches.

  In the present disclosure, “allowing access” refers to enabling electrical measurement of a power supply voltage or the like by bringing a probe or the like into contact therewith. More specifically, for example, when the measurer inserts a probe or the like into the first to third openings, the first voltage line, the second voltage line, and the neutral line from the surface side of the busbar housing body. This means that the probe or the like is brought into contact so that the power supply voltage or the like can be measured.

  According to this aspect, the bus bar housing body has an opening including the first opening to the third opening, and the first voltage line and the second voltage line from the surface side of the bus bar housing body through the opening. And access to the neutral line respectively. Thereby, it is possible to measure the power supply voltage applied between the connection terminals of the branch switch without providing a terminal dedicated for power supply voltage measurement. Specifically, for example, a measurer such as a construction contractor inserts a probe or the like of a measuring device into the opening (first opening to third opening) from the surface side of the busbar housing, The power supply voltage applied between the connection terminals can be measured. Thus, by reducing the space for providing the power supply voltage measurement dedicated terminals, for example, in the case where the power supply voltage measurement dedicated terminals extend in the width direction of the distribution board, the distribution board For example, in the case where the terminal dedicated for power supply voltage measurement extends in the thickness direction of the distribution board, the cover that covers the bus in the distribution board can be reduced. The height of the distribution board in the thickness direction can be reduced. By reducing the cover height in this way, it is possible to increase the heat dissipation effect compared to when the cover height is high, or to install instructions and attachments in the difference area in the cover height direction. become able to.

  Moreover, since the 1st opening-3rd opening of a bus-bar storage body is provided on extension of the longitudinal direction of each branch switch, when arranging several branch switches side by side in the width direction, each branch The interval between the switches can be narrowed, and the distribution board can be downsized.

  Furthermore, since the plurality of openings of the bus housing are provided so as to be aligned in the width direction of the branch switch at a position corresponding to each branch switch (position on the extension in the longitudinal direction of each branch switch). For example, even when the measurer measures the power supply voltage applied between the connection terminals of a plurality of adjacent branch switches, the distance required to move the probe in the measurement at a plurality of locations can be reduced. Can be implemented.

  Further, in the distribution board of the above aspect, one of the first opening and the second opening is a longitudinal direction of the branch switch with respect to the other of the first opening and the second opening and the third opening. It may be configured to be arranged on the side.

  According to this configuration, even when the width direction of the distribution board is thinned, the distance between the voltage lines defined by JIS or the like (for example, the distance between the buses or the distance between the connection terminals) is maintained. The first opening to the third opening of the busbar housing can be provided on the extension in the longitudinal direction of each branch switch. Thereby, when arrange | positioning a some branch switch side by side in the width direction, the space | interval between each branch switch can be narrowed and size reduction of a distribution board can be implement | achieved.

  Further, in the distribution board of the above aspect, the first bus bar of the bus group is a plate-like bus bar extending along the surface of the bus housing body, and the second bus bar of the bus group is the first bus bar. The first bus bar extends in parallel with the first bus bar on the back side, and the first bus bar is located at a position corresponding to an opening that allows access to the second bus bar from the front side of the bus bar housing body. A cylindrical portion made of an insulator that penetrates the penetrating portion in the front-back direction is integrated with the bus-bar housing body. It may be provided and may be configured to be accessible from the front side of the bus housing body to the second bus.

  In the present disclosure, “parallel” refers to being substantially parallel. For example, it is a concept that includes a case in which at least one of the first bus bar and the second bus bar is slightly inclined from the parallel state to the direction in which the interval between the two bus bars widens or narrows depending on the mounting state or the like.

  According to this configuration, for example, when the connection terminal on the primary side of the branch switch is overlapped in the front and back direction, that is, when the first bus bar and the second bus bar are overlapped in the front and back direction, the adjacent positions An opening that allows access to the first busbar and an opening that allows access to the second busbar can be disposed. That is, the voltage measurement by the measurer can be facilitated while realizing the downsizing of the distribution board.

  Further, in the distribution board according to the above aspect, each branch switch includes a bus side of two buses out of a bus of the first voltage line, a bus of the second voltage line, and a bus of the neutral line. It is configured so that a connection terminal can be selected and connected, and when the bus is selected, it is configured to close an opening that allows access to the bus that is not selected. Also good.

  According to this configuration, since the opening that allows access to the unselected busbar is closed, the measurer inserts a probe into the opening corresponding to the unselected busbar and makes an erroneous measurement. Can be prevented.

  According to the present invention, an opening is provided on the surface of the busbar housing on the extension in the longitudinal direction of each branch switch, and access to each voltage line (neutral line) from the opening is made possible. A compact distribution board can be realized while ensuring workability of power supply voltage measurement.

It is the perspective view which looked at the internal unit of the distribution board which concerns on embodiment from the front. It is the perspective view which looked at the bus-bar storage body in the state in which the bus-bar group was stored from the front diagonally lower side. It is the disassembled perspective view which looked at the bus-bar storage body and the bus-bar group from the front diagonally lower side. It is the perspective view of the front cover of a bus-bar storage body, (a) is the perspective view seen from front diagonally lower side, (b) is the perspective view seen from back diagonally upper side. It is the perspective view which looked at the storage body main body of the bus-bar storage body from back diagonally upward. It is the perspective view which looked at the branch switch from the front diagonal upper side.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its scope of application, or its application.

(Overview of distribution board)
The distribution board according to the present embodiment is, for example, a residential distribution board, and is connected to a single-phase three-wire commercial power circuit. The distribution board has a figure inside a housing (not shown). An internal unit 10 as shown in FIG. The internal unit 10 includes a main switch 11 connected to a commercial power path on the primary side, a bus group 2 connected to a secondary side of the main switch 11 via a conductive connection member (not shown), and a bus A box-like busbar housing body 3 in which the group 2 is accommodated, and six branch switches 4 and 5 (three branch switches 4 and three branch switches 5) connected to the bus group 2 from below. 3). The main switch 11 is attached to the attachment plate 12 from the front side, and the attachment plate 12 is fixed to the casing of the distribution board by screws or the like. In addition, the connection between the secondary side of the main switch 11 and each bus of the bus group 2 described later is a connection plate formed by bending or punching a conductive plate (for example, a copper plate), or terminal plates at both ends. This is done using connected wires. Although not shown, the outside of the connection plate is covered with an insulating cover (for example, a resin cover).

  In the following description, “front” refers to the operation unit 43 side (see FIG. 6) of branch switches 4 and 5 described later in a state where the main switch 11 is attached to the mounting plate 12. “Back” refers to the mounting plate 12 side. In addition, “upper” and “lower” refer to the upper side and the lower side, respectively, when the distribution board is installed on a wall surface of a house. In FIG. 1, in a state where the internal unit 10 is attached to the attachment plate 12, the bus housing body 3 side is the upper side, and the branch switches 4 and 5 side are the lower side. A direction orthogonal to the front-rear direction and the up-down direction is referred to as a left-right direction.

  The branch switches 4 and 5 have the same or similar configuration, and have a box-shaped switch body 40 as shown in FIG. An operation part 43 for turning on / off the electrical connection between the power supply side and the load side is provided at the middle part (position closer to the lower side) of the top, bottom, left and right at the front end of the switch body 40.

  A plug-in terminal 41 serving as a switch-side connection terminal that is recessed downward is provided at the front side portion of the upper end of the switch body 40. The front side of the plug-in terminal 41 is open, and access to the plug-in terminal 41 from the front side of the branch switch 4 (for example, a measurement terminal such as a probe is inserted and brought into electrical contact) becomes possible. Yes. Further, a display unit 45 that displays a voltage supplied to the load side is provided at the front end of the switch body 40 below the plug-in terminal 41.

  As shown by the solid line in FIG. 6, when the plug-in terminal 41 is on the right side (hereinafter also referred to as the right plug-in terminal 41), the right plug-in terminal 41 has a neutral bus 23 (see FIGS. 1 and 3). ) Is connected. On the other hand, as shown by a virtual line in FIG. 6, when the plug-in terminal 41 is on the left side (hereinafter also referred to as the left plug-in terminal 41), the left plug-in terminal 41 includes the bus 21 or the first voltage line A bus 22 (see FIGS. 1 and 3) of two voltage lines is connected. Therefore, in FIG. 1, the branch switches 4A, 4B, 4C, 5A are in the state of the right plug-in terminal 41, and the branch switches 5B, 5C are in the state of the left plug-in terminal 41. Reference numeral 46 denotes a closing portion provided on the left side of the right plug-in terminal 41 when the plug-in terminal 41 is on the right side, that is, in the state of the right plug-in terminal 41, and a measurement hole 32b (see FIG. 4) is closed to prevent access from the front side. Thereby, the measurement mistake by a measurer can be prevented. In the case where the plug-in terminal 41 is on the left side, that is, in the state of the left plug-in terminal 41, the closing portion 46 is provided on the right side of the left plug-in terminal 41. (See FIG. 4) can be closed to prevent access from the front side.

  Returning to FIG. 6, a plug-in terminal 42 serving as a switch-side connection terminal that is recessed downward is provided at the rear end portion of the upper end of the switch body 40. The plug-in terminal 42 is connected to the bus 21 of the first voltage line or the bus 22 of the second voltage line. In addition, a load-side plug-in terminal 44 is provided at a corner portion on the lower front side of the switch body 40.

  The branch switches 4 and 5 may be configured to output either one of 100V / 200V or may be configured to be able to switch between 100V / 200V. That is, the plug-in terminal 41 may be fixed to either the left or right, and may be configured to be movable to the left or right. In FIG. 1, branch switches 4A, 4B, 5A, and 5B show an example in which the plug-in terminal 41 is fixed (output any one of 100V / 200V). 5C shows an example in which the plug-in terminal 41 is configured to be movable left and right (switchable between 100 V / 200 V). In the branch switches 4C and 5C, the closing portion 46 extends to the display window 32d side, and the closing portion 46 also moves in the left-right direction as the plug-in terminal 41 moves in the left-right direction.

(Assembly structure of busbar and busbar housing)
As shown in FIG. 3, the bus group 2 includes a bus 21 of a first voltage line, a bus 22 of a second voltage line, and a bus 23 of a neutral line having different potentials. When the plug-in terminals 41 and 42 (see FIG. 6) of the branch switches 4 and 5 are connected to the bus 21 of the first voltage line and the bus 23 of the neutral line, respectively, the secondary of the branch switches 4 and 5 100V is supplied to a load (for example, an electric device) connected to the side. On the other hand, when the plug-in terminals 41 and 42 (see FIG. 6) of the branch switches 4 and 5 are connected to the bus 21 of the first voltage line and the bus 22 of the second voltage line, respectively, 200V is supplied to the load connected to the secondary side. When the plug-in terminals 41 and 42 (see FIG. 6) of the branch switches 4 and 5 are connected to the bus 22 of the second voltage line and the bus 23 of the neutral line, respectively, the secondary of the branch switches 4 and 5 In contrast to the case where the first voltage line bus 21 and the neutral line bus 23 are respectively connected to the load connected to the side, 100 V with the voltage phase inverted is supplied. FIG. 1 shows an example in which 100 V is supplied to the load side with respect to the branch switches 4A, 4B, 4C, and 5A, and 200 V on the load side with respect to the branch switches 5B and 5C. Shows an example in which the setting is made to be supplied.

  The bus 21 of the first voltage line is a conductive (for example, copper) plate-like member. 21a is an L-shaped connecting portion viewed from the bottom provided on the left end portion of the bus bar 21, and the left end portion of the connecting portion 21a is connected to the secondary side of the main switch. A screw insertion hole 21e for inserting a screw for connecting the plates is formed. 21b is a base part integrally formed to extend from the lower right end of the connection part 21a to the right side. 21c is a bus-side connection terminal formed by bending the front end of the base portion 21b downward at a position corresponding to the plug-in terminal 41 of the branch switch 5, and is L-shaped when viewed from the front. ing. 21 d is a bus-side connection terminal formed by bending the rear end of the base portion 21 b downward at a position corresponding to the plug-in terminal 42 of the branch switch 4.

  The bus 22 of the second voltage line is a conductive (for example, copper) plate-like member. 22a is a connecting portion extending in the vertical direction at the left end portion of the bus bar 22, and a screw for inserting a screw for connecting a connecting plate connected to the secondary side of the main switch at the lower end portion of the connecting portion 22a. An insertion hole 22e is formed. 22b is a base part integrally formed to extend from the upper end of the connection part 22a to the right side. 22c is a bus-side connection terminal formed by bending the front end of the base portion 22b downward at a position corresponding to the plug-in terminal 41 of the branch switch 4, and is L-shaped when viewed from the front. ing. 22 d is a bus-side connection terminal formed by bending the rear end of the base portion 22 b downward at a position corresponding to the plug-in terminal 42 of the branch switch 5. Reference numeral 22f denotes a measurement terminal portion formed by bending the front end of the base portion 22b upward at a position corresponding to a cylindrical portion 35 to be described later, and is L-shaped when viewed from the left side. A measurement terminal 22g that extends integrally in a rectangular shape toward the right is provided at the upper end of the measurement terminal 22f.

  The neutral bus 23 is a conductive (for example, copper) plate-like member. 23a is a plate-like base portion extending in the left-right direction, and a screw insertion hole 23e through which a screw for connecting a connection plate connected to the secondary side of the main switch is inserted into the left end portion of the base portion 23a. Is formed. 23b is a through-hole penetrating in the front-rear direction (front and back direction) provided at a position corresponding to a cylindrical portion 34 described later. Similarly, 23c is a through-hole penetrating in the front-rear direction (front and back direction) provided at a position corresponding to a cylindrical portion 35 described later. The diameters of the through holes 23b and 23c are slightly larger than the outer diameters of the cylindrical portions 34 and 35, respectively, so that the cylindrical portions 34 and 35 can be inserted in the front-rear direction. 23d is a bus-side connection terminal formed by bending the rear end of the base portion 21b downward at a position corresponding to the plug-in terminal 41 of the branch switches 4 and 5, and L in a rear view seen from the rear side. It has a letter shape.

  As shown in FIG. 1, the bus bar storage body 3 has an insulating (for example, resin) box shape, and is attached to the front side of the box-shaped storage body main body 31 and the storage body main body 31. And a top cover 33 that is attached to the upper side of the storage body main body 31 and covers the upper surface of the storage body main body 31.

  As shown in FIG. 3, the lower plate 31 a of the housing body 31 has a terminal hole 31 c penetrating in a vertical direction at a position corresponding to the left plug-in terminal 41 (see a virtual line in FIG. 6), and a plug-in terminal 42. A terminal hole 31d penetrating in the vertical direction is formed at a position corresponding to. Further, the lower plate 31a of the housing body 31 is formed with a terminal cutout 31g cut out in the front-rear direction at a position corresponding to the right plug-in terminal 41 (see the solid line in FIG. 6).

  Further, the front plate 31b of the housing body 31 is integrally provided with cylindrical portions 34 and 35 protruding forward at positions corresponding to the bus bar side connection terminals 21c of the bus bar 21 and the measurement terminals 22g of the bus bar 22. ing. Through holes 34a and 35a penetrating in the front-rear direction are formed at positions corresponding to the cylindrical portions 34 and 35 of the front plate 31b (see FIG. 5). Reference numeral 38 denotes an engaging claw that protrudes toward the front at the lower right corner of the front plate 31b and engages with an engaged portion 32e provided on the side surface of the right end of the front cover 32 described later. . 31e is a positioning portion for preventing the branch switches 4 and 5 from being displaced in the left-right direction when the plug-in terminals 41 and 42 of the branch switches 4 and 5 are connected to the bus-side connection terminals. It is.

  As shown in FIG. 5A, the upper surface of the housing body 31 is open, and after inserting the bus 22 of the second voltage line from the upper opening, it is slid to the right so that it does not come out downward. It is configured so that it can be fitted. At this time, each measurement terminal 22g of the bus bar 22 is located below each cylindrical portion 35 (through hole 35a), and the front side of each cylindrical portion 35 is connected to each measurement terminal 22g of the bus bar 22. Access (for example, contact of a voltage measurement probe by a measurer) is possible. Further, as shown in FIG. 2, when the bus bar 22 is fitted into the housing body 31, the bus bar side connection terminals 22c and 22d protrude downward from the corresponding terminal holes 31c and 31d, respectively. It has become.

  Further, as shown in FIG. 5 (b), the housing body 31 is inserted into the bus 21 of the first voltage line through the upper opening after the bus 22 of the second voltage line is fitted, and then on the right side. It is configured so that it can be slid and fitted so as not to come out downward. At this time, a part of each bus bar side connection terminal 21c of the bus bar 21 is positioned below each cylindrical part 34 (through hole 34a), and each of the bus bars 21 from the front side of each cylindrical part 34 is arranged. Access to the bus-side connection terminal 21c is possible. Further, as shown in FIG. 2, when the bus bar 21 is fitted into the housing body 31, the bus side connection terminals 21c and 21d protrude downward from the corresponding terminal holes 31c and 31d, respectively. It has become. Here, on the inner side of the housing body 31, when the bus bar 21 is fitted, support portions 36a and 36b that contact the folded portions of the bus bar side connection terminals 21c and 21d are provided. The bus bar 22 is prevented from contacting. Thereafter, as shown in FIG. 1, the upper cover 33 is attached from the upper side of the housing body 31.

  As shown in FIG. 4, the front cover 32 is an insulating (for example, resin) plate-like member, and is located at a position corresponding to each of the cylindrical portions 34 and 35 (through holes 23 b and 23 c) of the front cover 32. The cover side cylindrical portion 32a as a first opening or a second opening extending in the front-rear direction is integrally provided. The inner diameter of the cover-side tubular portion 32a is slightly larger than the outer diameter of each tubular portion 34, 35, respectively.

  By adopting the above-described configuration, the neutral bus 23 can be attached from the front side of the housing body 31 in a state where the positions of the through holes 23b and 23c are aligned with the cylindrical portions 34 and 35, respectively. Become. Thereafter, the front cover 32 is pushed from the front side to the rear side with the positions of the cover side cylindrical portions 32a and the cylindrical portions 34, 35 of the front cover 32 being aligned, thereby engaging the front plate 31b. The claw 38 and the engaged portion 32e of the front cover 32 are engaged with each other and are prevented from coming off.

  In FIG. 4, 32 b is a measurement hole provided as a first opening or a second opening that is provided at a position corresponding to the front opening of the left plug-in terminal 41 and penetrates the front cover 32 in the front-rear direction. 32 c is a measurement hole serving as a third opening that is provided at a position corresponding to the opening on the front side of the right plug-in terminal 41 and penetrates the front cover 32 in the front-rear direction. The opening 30 is constituted by a cover-side cylindrical portion 32a and measurement holes 32b and 32c. 32d is a display window, from which the display unit 45 (power supply voltage display) of the branch switches 4 and 5 can be confirmed from the front side. 32h is a display section provided in the left empty area of the cover-side cylindrical section 32a. For example, an operator such as a construction contractor or a measurer or a user can connect each load (electrical equipment) and the branch switch 4, It is easy to specify the relationship with 5 and report when there is a problem.

  32g is a removal part of the branch switches 4 and 5 and extends upwards so as to surround both outer sides of the measurement holes 32b and 32c on the upper side of the display window 32d, and gradually increases in width toward the upper side. It is configured to be narrow. 32f is a tip provided at the upper end of the detachable portion 32g. A concave portion is formed on the front side to be pushed from the front side with a screwdriver or the like, and attached to the rear side when the concave portion is pushed from the front side. Protrusions for pushing the front upper corners of the branch switches 4 and 5 mounted on the plate 12 downward are provided. As described above, the removal portion 32g is provided so as to surround both outer sides of the measurement holes 32b and 32c, so that the direction connecting the approximate centers of the measurement holes 32b and 32c of the removal portion 32g varies in the front-rear direction of the removal portion 32g. Since it becomes easy to act as a moving shaft, the elastic strength in the front-rear direction is relatively weak compared to the peripheral portion, and the branch switches 4 and 5 can be easily removed. That is, the measurement holes 32b and 32c also have a function of adjusting the elastic strength of the removal portion 32g.

(Power supply voltage measurement work)
Next, the measurement of the power supply voltage applied between the connection terminals of the branch switches 4 and 5 by a measurer such as a construction contractor will be described.

  For example, the measurer holds the measurement monitor in one hand, holds the two probes with the other hand, and places the probes in any two of the first to third openings of the busbar housing body. By inserting, the power supply voltage applied between the connection terminals of the branch switch can be measured. In the present embodiment, one of the measurement holes 32b and 32c (the hole corresponding to the bus-side connection terminal not connected to the plug-in terminal 41) is closed by the closing portion 46, as shown by the oblique lines in FIG. Therefore, the measurer puts the probe on the other of the measurement holes 32b and 32c (the hole corresponding to the bus-side connection terminal connected to the plug-in terminal 41) and the cover-side tubular portion 32a. Insert and measure the power supply voltage.

  As described above, according to the present embodiment, from the opening 30 on the surface of the busbar housing 3 (front cover 32) on the extension in the longitudinal direction of each branch switch 4, 5 to each voltage line (neutral line). The two openings into which the probe is inserted in order to measure the power supply voltage can be arranged close to each other. Thus, even if the measurer has a measurement monitor in one hand, the power supply voltage can be measured by holding the two probes with the other hand. That is, it is possible to ensure the workability of the power supply voltage measurement. Further, since the opening 30 is provided on the extension in the longitudinal direction of each branch switch 4, 5, a dedicated measurement terminal or the like is not required, and a miniaturized distribution board can be realized.

  As shown in FIG. 2, in the branch switch 4 and the branch switch 5, the positions of the bus-side connection terminals 21c and 21d of the first voltage line and the bus-side connection terminals 22c and 22d of the second voltage line Is the opposite. That is, in the branch switch 4, the bus-side connection terminal 21 d of the first voltage line is connected to the plug-in terminal 42, and in the branch switch 5, the bus-side connection terminal 22 d of the second voltage line is connected to the plug-in terminal 42. Yes. This is such a configuration for the purpose of balancing the phase of the electric circuit. On the other hand, the distribution board according to the present embodiment can be measured by the same measurement method regardless of whether the measurer measures the branch switches 4 and 5. In this case, the workability of the power supply voltage measurement is ensured.

  Since the downsized distribution board can be realized, the present invention is extremely useful, for example, as a residential distribution board and an additional distribution board.

2 Busbar Group 3 Busbar Housing 4,5 Branch Switch 21 Busbar 21c, 21d Bus Side Connection Terminal 22c, 22d Bus Side Connection Terminal 23d Bus Side Connection Terminal 22 Bus Side Connection Terminal 22 Neutral Wire 23 Bus line 30 Opening 32a Cover side cylindrical part (first opening, second opening)
32b Measuring hole (first opening, second opening)
32c Measurement hole (third opening)
34, 35 Tubular part 41, 42 Plug-in terminal (switch side connection terminal)

Claims (4)

A bus group including a bus of a first voltage line, a bus of a second voltage line, and a bus of a neutral line having different potentials, a box-shaped bus accommodating body in which the bus group is accommodated, and the bus group. A distribution board having a plurality of branch switches,
Each of the branch switches has a switch-side connection terminal to which the bus group is connected to one side surface in the longitudinal direction, and the plurality of branch switches are the switch-side connection terminal and the bus housing body. Arranged side by side in the width direction of the branch switch so as to face one side of
Each bus of the bus group has a bus-side connection terminal that can be connected to each connection terminal of each branch switch on one side of the bus housing body,
The busbar housing body has a first opening that allows access to the first voltage line on a surface orthogonal to one side surface of the busbar housing body on the longitudinal extension of each branch switch, An opening including a second opening that allows access to two voltage lines and a third opening that allows access to the neutral line;
The distribution board, wherein the plurality of openings are provided in positions corresponding to the branch switches in a width direction of the branch switches. The distribution board according to claim 1,
One of the first opening and the second opening is disposed on the longitudinal direction side of the branch switch with respect to the other of the first opening and the second opening and the third opening. Distribution board. In the distribution board of Claim 1 or 2,
The first bus of the bus group is a plate-shaped bus that extends along the surface of the bus housing body,
The second bus of the bus group extends in parallel with the first bus on the back side of the first bus,
The first bus bar penetrates in a front and back direction at a position corresponding to an opening that allows access to the second bus bar so as to allow access to the second bus bar from the front side of the bus bar housing body. A penetrating part that
A cylindrical portion made of an insulator that penetrates the penetrating portion in the front-back direction is provided integrally with the bus-bar housing body in the bus-bar housing body, so that the second bus bar can be accessed from the front side of the bus-bar housing body. A distribution board characterized in that it is configured as described above. In the distribution board of any one of Claim 1 to 3,
Each branch switch is configured to select and connect the bus-side connection terminals of two buses from the buses of the first voltage line, the buses of the second voltage line, and the buses of the neutral line The distribution board is configured to close an opening that enables access to a bus that is not selected when the bus is selected.

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