JP5747402B2 - Busbar insulation cover for residential distribution board - Google Patents

Description

The present invention relates to a bus insulation cover that maintains insulation on the front side of the bus bar by covering the opening side of the cabinet on the front side with respect to the bus bar provided on the residential distribution board, and in particular, connected to the bus bar. The present invention relates to a structure of a bus insulation cover for a residential distribution board having a function of suppressing a switching operation of switching means for switching a power supply voltage of the branch switch in a state where the branch switch is connected to the bus.

A residential distribution board is a cabinet incorporating internal devices such as a main switch, a bus connected to the secondary side of the main switch, and a branch switch connected to the bus. It is used as a service entrance device for electric circuits in houses and the like. The electric circuit to be applied is usually an electric circuit to which an AC 50 Hz or 60 Hz single-phase two-wire electric circuit (100 V) or a single-phase three-wire electric circuit (100/200 V) is applied.

In recent years, an electrical device used in a house requires an exclusive circuit for supplying power to the device, and an apparatus that directly connects and connects to the branch switch is increasing. For example, a 24-hour ventilation system or a built-in type dishwasher is applicable. When supplying power to such a device, after wiring the branch switch and the device, the power is supplied to the device by turning on the operation handle for opening and closing the electric circuit of the branch switch. Some devices are not provided with a power switch on the device body. In such devices, power is immediately applied when an operation handle for opening and closing the electric circuit is turned on.

In a distribution board that is applied to a circuit that outputs a plurality of power supply voltages of 100 V or 200 V according to two selected lines among three lines, such as a single-phase three-wire circuit, each branch The circuit needs to be supplied with a voltage having a magnitude suitable for the equipment connected to each branch circuit. Therefore, a distribution board is known in which a voltage switching structure is provided on the bus side so that the power supply voltage supplied to the device can be appropriately switched according to the device connected to the branch circuit.

For example, in Patent Document 1, as shown in FIG. 16, bus bars (reference numerals 1, 2, and 3 in Patent Document 1) that form a main electric circuit and bus bar legs that are screwed and connected to terminals of a circuit breaker Switching devices are provided between the units (reference numerals 101, 301, 601 and the like of Patent Document 1). This switching device is provided in a hole of a long hole (reference number 602 of patent document 1) and a switching piece (reference number 8 of patent document 1) provided in a connection bar (reference number 6 of patent document 1) constituting the switching device. The position of the switching screw (reference numeral 7 in Patent Document 1) penetrated together is moved to one end or the other end of the elongated hole to select a conductor to be conducted, and the conductor connected to the terminal of the circuit breaker is switched to change the circuit. The voltage supplied to the circuit breaker is changed.

In Patent Document 2, as shown in FIG. 17, as in Patent Document 1, busbars (reference numerals 11, 12, and 13 of Patent Document 2) that form a main electric circuit and plug-in type terminals of a circuit breaker are provided. A switching device is provided between the connection parts of the bus bars that are plug-in connected (reference numerals 1301, 2001, etc. in Patent Document 2). And a screw (reference numeral 17 of patent document 2) which penetrates both a long hole provided in a feed plate (reference numeral 20 of patent document 2) and a cylindrical conductor (reference numeral 18 of patent document 2) constituting the switching device. Is moved to one end or the other end of the elongated hole, the conductor to be conducted is selected, the bus bar connected to the terminal of the circuit breaker is switched, and the voltage supplied to the circuit breaker is changed.

After the power supply voltage supplied to the branch switch is appropriately switched on the bus side and the wiring connection between the branch switch and the device is completed, before the power is applied to the device, it is usually of a suitable size for the device. In order to confirm whether or not a voltage of 1 is applied, a voltage measurement operation is performed. In the case of the distribution board shown in Patent Document 1, a voltage is applied to the foot of the bus bar (reference numerals 101 and 601 in Patent Document 1) connected to the branch switch (reference numeral 5 in Patent Document 1). A test lead connected to the voltage measuring device is brought into contact with the voltage measuring device, and the voltage between the feet is measured. In the case of the distribution board shown in Patent Document 2, the voltage measuring device is connected to the connecting portion (1301, 2001 in Patent Document 2) of the bus bar connected to the branch switch (reference 15 in Patent Document 2). The lead is brought into contact, and the voltage between the feet is measured.

After measuring the voltage, when the operation handle side of the branch breaker is set to the front side with respect to the above-described bus bar and switching device, an insulating cover (not shown) of the bus bar covering the front side is attached to a predetermined position, Ensure insulation from the front side.

JP-A-9-271108 JP 2002-135919 A Japanese Patent No. 4147665

In the residential distribution board having the voltage switching structure on the bus side as described above, the connection bar and the feed plate used as the voltage switching structure, and the switching associated with the connection bar and the feed plate are used. Many member constituent members such as screws, switching pieces and cylindrical conductors are exposed on the front side.

When operating the switching screw for voltage switching, it is necessary to loosen the switching screw after removing the insulation cover of the bus bar, move the switching screw, and tighten the screw again. If work is performed without turning off the main switch by mistake, the electrical safety is not sufficiently maintained, and an electrical accident such as an electric shock may occur.

In some cases, the voltage switching structure is provided on the branch switch side instead of the bus side. For example, in Patent Document 3, as shown in FIG. 18, the bus bars are provided in three stages in the direction of the operation handle from the mounting surface of the branch switch (reference numerals B1, B2, and B3 in Patent Document 3). The position of the plug-in terminal is adjusted in advance in each pole so that the plug-in terminal (reference numeral 3 in Patent Document 3) can be connected to two predetermined buses among the buses provided in these three stages. Thus, the power supply voltage supplied to the branch switch is appropriately selected and switched. When switching the voltage, to remove the branch switch once from the bus, even if there is a work without turning off the main switch, power is not supplied to the removed branch switch, In adjusting the arrangement of the plug-in terminals 3 after removal, the risk of electric shock is reduced.

However, in the case where the voltage switching structure is provided on the branch switch side, there are the following problems.

In the plug-in type branch switch as described above, when measuring the voltage supplied to the branch switch, each pole is positioned closer to the load side than the contact device opened and closed by the operation handle of the branch switch. Since the voltage measuring unit is provided, it was necessary to measure the voltage with the operation handle of the circuit breaker turned on. That is, for electrical equipment that is used in direct wiring with the branch switch, when checking after wiring that the voltage supplied to the electrical equipment is correct, the operation handle of the branch switch is turned on. In this state, it was necessary to measure the voltage between the electrodes by bringing the test lead of the voltage measuring instrument into contact with the voltage measuring unit.

Therefore, if the bus connecting the plug-in terminal is mistakenly wired in the single-phase three-wire circuit, the rated voltage of the electrical device connected to the branch switch is supplied from the branch switch. When the voltage is higher than the voltage, it is assumed that the rated voltage is insufficient and the normal operation is not performed, and when the rated voltage of the electrical equipment connected to the branch switch is lower than the voltage supplied from the branch switch, It is assumed that electrical equipment will fail due to overvoltage.

In the state where the insulation cover such as the above-mentioned bus is attached, the branch switch is connected to any bus of the single-phase three-wire bus, and the power supply voltage of 100 V or 200 V is applied. The problem is that it is difficult to determine whether the correct power supply voltage is set to be supplied to the branch circuit.

Further, when the insulating cover is removed, particularly in the case of Patent Documents 1 and 2, a part of the bus and the conductor are exposed to the front side, and the hand, clothes, and measuring device are used for voltage measurement. If it is accidentally brought into contact with the charging part, an electric accident such as an electric shock may occur.

Therefore, the present invention has been made in view of the above problems, and in a residential distribution board, it is visually determined how much power supply voltage is supplied to the branch switch even with the busbar insulation cover attached. An object of the present invention is to provide a bus insulation cover structure for a residential distribution board that is easy to check. Also, before supplying power to the load circuit from the branch switch, the voltage supplied to the branch switch can be confirmed with good workability while ensuring electrical safety. An object is to provide a cover structure. Furthermore, it aims at providing the structure of the bus | bath insulation cover of the distribution board for houses which can suppress switching operation of the operation part of the voltage switching means provided in the branch switch.

The structure of the bus insulation cover of the residential distribution board according to the present invention is configured to solve the above-described problems, and the first voltage electrode of the single-phase three-wire electric circuit, the second are arranged inside the cabinet. A main switch connected to each of the voltage poles and neutral poles, a bus of each pole disposed on the secondary side of the main switch, and any two of the buses of each pole A branch switch connected to the bus, wherein the power switching terminal is moved to a position corresponding to one of the two buses by the voltage switching means to either the first position or the second position. A branch switch that selectively connects the power connection terminal to the two bus lines to supply power of a voltage suitable for the branch circuit, and at least the bus bar that covers the opening side of the cabinet on the front side with respect to the bus line And a bus insulation cover for maintaining insulation on the front side of the housing. Structure busbar insulating covering in, the mother line insulating cover in a state attached to a predetermined position inside the cabinet, the opening fled the moving locus of the operating unit for operating the power supply switching means provided in the branch switch And a rib provided on the movement trajectory of the operating portion in the opening as the suppressing portion that engages with the operating portion that operates the power supply switching means and suppresses the operation of the operating portion. It is good to configure .

According to such a configuration, in the state where the bus bar insulating cover is attached at a predetermined position, the switching operation of the operation unit that operates the power source switching means provided in the branch switch is suppressed. Therefore, before the branch switch is attached to the bus bar, The position of the power supply connection terminal set in accordance with the power supply voltage supplied to the branch circuit is not changed, and the supply voltage can be confirmed and the supply voltage can be measured while ensuring electrical safety.

Delete

In addition , when the bus insulation cover is attached at a predetermined position, the switching operation of the operation unit for operating the power supply switching means provided in the branch switch can be physically suppressed by the rib, and the branch switch is attached to the bus. The state of the operation part of the power supply switching means set according to the power supply voltage previously supplied to the branch circuit can be visually confirmed from the front side, making it easier to check the power supply voltage and ensuring electrical safety Thus, the supply voltage can be confirmed and the supply voltage can be measured.

Further, the structure of the bus insulation cover of the residential distribution board according to the present invention is such that the power supply voltage measurement unit is measured by escaping the power supply voltage supplied to the branch circuit through the opening formed in the bus insulation cover. A power supply voltage measuring unit provided in the branch switch for opening may be configured to be exposed to the front side.

According to such a configuration, in a state where the bus bar insulation cover is attached at a predetermined position, the opening is opened so as to expose the power supply voltage measuring unit provided in the branch switch to the front side. Before supplying power to the load circuit from the tester, the voltage actually supplied to the branch switch can be confirmed by inserting a test lead into the previous power supply voltage measurement unit through the opening, and with the bus insulation cover attached This ensures good workability while ensuring electrical safety.

Further, the structure of the bus insulation cover of the residential distribution board according to the present invention has a first position and a second position of the power connection terminal in the vicinity of the operation unit for operating the voltage switching means provided in the branch switch. A voltage display section of a branch switch that is provided over the position of the power supply connection terminal and displays a voltage that is supplied according to the position of the power connection terminal, a first opening that is exposed to the front side, and the branch switch A second opening may be provided to escape the power supply voltage measurement section provided in the vessel and expose the power supply voltage measurement section to the front side.

According to such a configuration, the display area of the power supply voltage supplied to the branch switch and the area of the power supply voltage measurement section can be explicitly divided, and the opening used for voltage display and voltage measurement work for the operator. Can be easily distinguished, and it is possible to prevent mistakes between confirmation work and measurement work and to check with good workability.

In addition, the structure of the bus insulation cover of the residential distribution board according to the present invention, the second opening,
Corresponding to the front side of each of the first and second power supply voltage measuring units that are selected according to the first position and the second position of the power connection terminal provided on the branch switch and exposed to the front side It may be provided and configured.

According to such a configuration, it is possible to individually indicate the second openings used for voltage measurement, to reduce errors in the voltage measurement work, and to perform the voltage measurement work more safely and with good workability.

As described above, according to the present invention, it is possible to visually confirm how much power supply voltage is supplied to the branch switch even when the bus insulation cover is attached in the residential distribution board. Before supplying power to the load circuit from the switch, the voltage actually supplied to the branch switch can be confirmed with good workability while ensuring electrical safety. Furthermore, it is possible to provide a structure of a bus insulation cover for a residential distribution board that can suppress switching operation of the operation portion of the voltage switching means provided in the branch switch.

The internal unit unit perspective view in the distribution board for houses which shows 1st Embodiment is shown. The perspective view which removed the bus-bar insulation cover concerning the embodiment is shown. The perspective view of the bus-bar insulation cover concerning the embodiment is shown. The perspective view of the branch line which concerns on the same embodiment is shown. The assembly drawing of the bus-bar which concerns on the embodiment is shown. The assembly drawing of the bus-bar which concerns on the embodiment is shown. The assembly drawing of the bus-bar which concerns on the embodiment is shown. The assembly drawing of the bus-bar which concerns on the embodiment is shown. The assembly drawing of the bus-bar which concerns on the embodiment is shown. The principal part perspective view which concerns on the same embodiment is shown. The external appearance perspective view of the branch switch concerning the embodiment is shown. The figure of the terminal part of the branch switch concerning the embodiment is shown. The figure of the terminal part of the branch switch concerning the embodiment is shown. The disassembled perspective view of the terminal part of the branch switch concerning the embodiment is shown. The perspective view of the terminal part of the branch switch concerning the embodiment is shown. Movement explanatory drawing of the terminal part of the branch switch concerning the embodiment is shown. The principal part perspective view which shows 2nd Embodiment is shown. The principal part front view which concerns on the same embodiment is shown. The external appearance perspective view of the branch switch concerning the embodiment is shown. The perspective view of the terminal part of the branch switch concerning the embodiment is shown. The attachment explanatory view of the branch switch in the distribution board for houses concerning the embodiment is shown. The figure showing the conventional connection state is shown. The figure showing the conventional connection state is shown. The figure which switched in several places in the conventional connection state is shown. The principal part perspective view which shows 3rd Embodiment is shown. The perspective view of the bus-bar insulation cover concerning the embodiment is shown. The principal part front view which concerns on the same embodiment is shown.

Next, an embodiment of the present invention will be described in detail with reference to FIGS.

(Overview of residential distribution board)
The residential distribution board according to the first embodiment is used for a single-phase three-wire commercial power circuit. As shown in FIGS. 1 and 2 (a diagram in which the bus bar insulation cover 7 is removed from the state shown in FIG. 1 for the sake of explanation), the residential distribution board has a main switch 1 and the main switch as shown in FIG. Buses 11, 12, and 13 connected to the secondary side of the device 1 through a connecting member (not shown), the branch switch 2 connected to each of the buses, and the opening side of the cabinet as the front side, An internal device such as a bus bar insulation cover 7 covering the front side of the bus bar is incorporated as an internal unit 100 mounted on the mounting plates 3 and 4, and is mainly used as a circuit entrance device in a house or the like. The connection between the secondary side of the main switch and the bus is performed using a connection bar formed by bending or punching a copper bar for each pole, an electric wire having terminal plates connected to both ends, and the like.

The buses 11, 12, and 13 have different potentials. For convenience, the bus 11 serving as the first voltage electrode is L1, the bus 12 serving as the second voltage electrode is L2, and the bus serving as the neutral electrode. 13 is represented by N. These bus bars are made of copper bars formed in a substantially columnar shape. The bus bars are arranged in parallel and arranged on an insulating member 5 that insulates the bus bars from each other, and then attached to the mounting plate 3.

The branch switch 2 provided in the residential distribution board is provided with a voltage switching structure as shown in FIG. 11, and includes two predetermined buses and plug-in terminals among the buses 11, 12, and 13. By being electrically connected, power is supplied to the load circuit (details will be described later). In the single-phase three-wire circuit, the power supply voltage that can be supplied to the load circuit is 100V or 200V.

When the plug-in terminal (22B in FIG. 11) of the branch switch 2 is connected to the busbars 11 (L1) and 12 (N), 100 V is supplied, and the busbars 11 (L1) and 13 (L2) When connected, 200V is supplied. Further, when the plug-in terminal (22B) of the branch switch is connected to the busbars 13 (L2) and 12 (N), 100 V is supplied, but the voltage phase is the busbars 11 (L1) and 12 The phase is opposite to that when (N) is connected.

At present, the power supply voltage supplied to the load circuit is 100V as a general outlet circuit used for a lighting circuit in a house and a home appliance such as a television or a video, and is used for a circuit used for a large capacity air conditioner. Uses 200V. In this way, by changing the connection state between the plug-in terminal of the branch switch 2 and the bus bar in accordance with the electrical equipment connected to the load circuit, the voltage of the power source supplied to the branch switch and the load circuit is appropriately set. Set to something.

At both ends of the bus, holes through which screws for connecting the bus and other conductors pass are provided. Between both ends of the bus bar, branch switches are arranged in parallel along the longitudinal direction of the bus bar (left and right direction in FIG. 2), and connected to the bus bar of the branch switch with the bus bar 13 as a boundary. The branch switches are arranged in two upper and lower rows so that the parts face each other. The branch switches in the upper row are connected to the bus 11 (L1) and the bus 12 (N) or 13 (L2), and when connected to the bus 11 (L1) and the bus 12 (N), 100V. Is supplied and 200 V is supplied when connected to the bus 11 (L1) and the bus 13 (L2). When the branch switch in the lower row is connected to bus 13 (L2) and bus 12 (N) or bus 11 (L1), and connected to bus 13 (L2) and bus 12 (N) When 100V is supplied and connected to the bus 13 (L2) and the bus 11 (L1), 200V is supplied.

(Bus structure)
Next, the structure of the bus will be described in detail with reference to FIGS. FIG. 4 shows a state in which some branch switches are removed from the internal unit 100 and the busbars are exposed.

In the buses 11, 12, and 13, branch lines 1101a, 1201a, and 1301a, which are electrical connection portions between the bus bars and the plug-in terminals of the branch switches, correspond to the parallel positions of the branch switches, It protrudes in a direction perpendicular to the longitudinal direction. Branch line 1101a corresponds to bus 11 (L1), 1201a corresponds to bus 12 (L2), 1301a corresponds to bus 13 (N), and these branches 1101a, 1201a, 1301a form a single branch There are as many circuit units as possible.

In the branch switch in the lower row, when connecting the branch switch to the bus, the plug-in terminal of the branch switch is shared with the branch line 1201a (L2), and 1101a (L1) or 1301a (N). By selectively connecting to, power of 200V or 100V is supplied.

The same applies to the branch switches in the upper row, by selectively connecting the plug-in terminals of the branch switches to 1201a (L2) or 1301a (N) with the branch line 1101a (L1) in common. , 200V or 100V power is supplied.

(Busbar insulation cover structure)
Next, the structure of the bus-bar insulating cover 7 will be described with reference to FIGS. As shown in FIG. 1, the bus bar insulating cover 7 is made of a resin formed on a substantially flat plate disposed so as to cover the power supply side terminal of the branch switch 2 and the front side of the bus bars 11, 12, 13. It is a cover. Used as an insulating plate to prevent direct contact with the bus bar from the front side of the cabinet.

Arrangement of the bus bar insulation cover 7 at a predetermined position is such that a plurality of engagement holes (not shown) between a plurality of hooks (not shown) provided on the insulating member and the hooks provided on the bus bar insulation cover 7 are illustrated. Positioning) is engaged.

In the substantially central portion of the bus insulation cover 7, there is an opening 71 that escapes the movement locus of the power switching operation portion for switching the position of the power connection terminal provided in the power terminal portion of the branch switch 2 described later. The number is appropriately formed according to the number of branch switches.

Further, a rib 72 is formed at a substantially central portion of the opening 71 to suppress the movement of the power switching operation unit. The rib 72 is formed so as to extend from one side of the opening partway to the middle, but the opposite side so as to bridge the central part of the opening 71 in a direction perpendicular to the movement locus of the power supply switching operation unit. It may be formed to extend up to.

A circular opening 73 is formed in the left portion of the bus insulating cover 7 so that a voltage measuring portion on the bus side to be described later can be seen from the front side. The shape of the opening 73 may be circular or rectangular.

(Assembly structure of busbar)
Next, the assembly structure of the bus will be described with reference to FIGS. FIG. 5 is a diagram showing an external perspective view of each bus bar of each pole.

Among the buses of the respective poles, the buses of the voltage poles 11 (L1) and 12 (L2) are formed in the same shape.

The L2 voltage pole bus 12 will be described as an example. The bus pole 12 of the L2 voltage pole has a trunk portion 120 extending in the direction in which the branch switch 2 is juxtaposed, at both ends. Is formed with a hole for passing through a screw terminal for connecting the bus bar to another electric conductor.

When the direction from the rear surface, which is the mounting surface of the branch switch to the distribution board, to the front surface where the operation handle is provided is the height direction, the trunk portion 120 has the height direction. A rising portion 121 that is bent substantially at right angles to the trunk portion is formed, and from the rising portion 121, the branch line is connected in a direction opposite to each other (connected to the trunk portion 120 substantially in parallel). (The power source-load side direction of the branch switch).

Of the branch lines, a branch line 1201a extending in the direction of the trunk portion 120 is a branch line commonly connected to the branch switch 2 in the lower row in FIG. 10, and the branch line 1201b. Is a branch line that is selectively connected to a branch line of another pole by the branch switch 2 in the upper row.

Further, the bus 11 of the voltage electrode L1 has the same outer shape as the bus 12 of the voltage electrode L2, and the branch line extending in the direction of the trunk portion 110 of the two branch lines. 1101b is a branch line commonly connected to the branch switch 2 in the upper column, and the branch line 1101a is selectively connected to the branch line of the other pole by the branch switch 2 in the lower column. It is a branch line.

Among the buses of each of the poles, the neutral pole bus 13 will be described. A direction in which the trunk 130 of the neutral pole bus 13 is arranged in parallel with the branch switch 2 like the voltage pole bus. The screw holes for connecting the bus bar and other electric conductors are formed at both ends.

Further, both ends of the neutral electrode bus 13 are bent so as to form a step, and when the bus of each electrode is attached to the insulating member 5, the trunk portion 130 becomes the bus of the voltage electrode. 11 and 12 are arranged to be higher in the height direction.

A plurality of branch lines 1301a and 1301b from the trunk portion 130 of the neutral pole bus 13 are substantially parallel to the trunk portion 130 in opposite directions (the power supply of the branch switch to be connected- It extends integrally in the load side direction). These branch lines 1301 a and 1301 b are both branch lines that are selectively connected to the branch switch 2.

Further, as will be described later, if the positional relationship of branch lines in the case of combining three buses of each pole is supplemented, the configuration is as follows.

Taking the branch switch in the upper row as an example, the branch switch of the branch line in the bus 11 of the voltage pole of L1, the branch line in the bus 12 of the voltage pole of L2, and the branch line in the bus 13 of the N pole The branch lines 1201b and 1301b that are selectively connected to the device 2 are located in the middle of the respective branch lines alternately in the parallel arrangement direction of the branch switches. It is arranged as follows. Each of the branch lines 1201b and 1301b protrudes to the trunk portion of the other voltage electrode bus in the front view, and is connected in common to the branch switch in the plan view from the front side. 1031a and 1201b have substantially the same length.

Next, branch lines 1301a and 1301b in the bus 13 of the neutral pole are arranged at the same position as the branch lines 1201b and 1101a in the parallel arrangement direction of the branch switches, and in a plan view from the front side, It is formed to have substantially the same length as the branch lines 1101a and 1201b. Since the trunk 130 of the neutral electrode bus 13 is disposed so as to be higher in the height direction than the voltage electrode buses 11 and 12, they do not interfere with each other.

That is, on either side of the upper row and the lower row in FIG. 10, branch lines 1101a and 1301a and 1101b and 1301b that are selectively connected to the branch switch 2 among the branch lines from the front side. Are arranged so as not to overlap each other in plan view.

The branch lines 1101a and 1301a, and 1101b and 1301b are provided with the same height. Further, when the branch lines forming one set are viewed from the direction in which the branch switch is inserted, the branch line always located on the right side is the N-pole branch line in both the upper column and the lower column. It has a structure that can be visually unified.

Next, the assembly of the internal unit 100 will be described with reference to FIGS.
6, the L1 voltage pole bus 11 and the L2 voltage pole bus 12 are attached to the insulating member 5. The insulating member 5 is formed of a resin material so as to insulate the busbars, and various sizes are prepared according to the length of the main portion of the busbar according to the number of branch circuits.

The insulating member 5 has recesses 511, 512, and 513 into which nuts corresponding to screw terminals provided in advance at both ends of the bus bar are fitted in advance so that the bus bar is uniquely arranged. Insulating wall A515, insulating wall 6 to be described later, and neutral electrode busbars, which are provided at the respective portions and insulate convex portions 514, branch lines 1101, 1201 corresponding to rising portions 111, 121 at the respective voltage poles. A screw hole 516 for fixing 13 with a screw is provided.

Next, the neutral electrode bus 13 is attached to the insulating wall 6. The insulating wall 6 is fitted with a fitting portion 611 for fitting the main body of the neutral pole while avoiding the branch lines 1301a and 1301b of the neutral pole bus 13 so that the neutral pole bus 13 can be uniquely attached. Is formed. Further, the insulating wall 6 is provided with a wall portion 612 that covers a part of the branch lines 1301a and 1301b of the neutral electrode bus 13 and a recess 613 that avoids the branch wires 1101a and 1201a in the voltage electrode bus. Therefore, the insulation between the neutral pole bus and the voltage pole bus is maintained.

Next, the insulating wall 6 to which the neutral electrode bus 13 is attached is attached to the insulating member 5 to which the voltage electrode bus is attached. At this time, from the upper part in the height direction to the insulating member 5 to which the neutral electrode bus bar 13 is attached, the recessed portion 513 is substantially connected to the bus bar of each voltage electrode. Positioning can be done by dropping it so that it overlaps the branch line. Then, the screw is inserted into the hole 130 for screwing and fixing provided on the bus bar of the neutral electrode, and the screw is screwed into the screwing hole 516 provided in the insulating member 5 to complete the mounting.

The bus bars of the two voltage electrodes L1 and L2 and the bus bar of the neutral electrode are insulated from each other by the insulating wall 6 and the insulating wall A515, respectively, and electrical safety is maintained.

Next, the insulating member 5 to which the bus of each pole and the insulating wall 6 are attached is attached by screwing and fixing to the attachment plate 3 of the branch switch. The mounting is performed by matching the positions of the screwing holes provided on the back side of the insulating member 5 and the screwing holes provided on the mounting plate 3 of the branch switch, and screwing from the back side.

(Structure of bus side voltage measurement unit)
Next, the structure of the bus side voltage measurement will be described. In FIG. 10, bus-side voltage measuring units 31 and 32 are provided at one end portions of the buses 11 and 12, respectively. The bus-side voltage measuring units 31 and 32 are bent so that the test lead contact portions 3101 and 3201 face the front side so that the voltage measurement test leads can be contacted from the front side of the residential distribution board. The mounting portion is fixed to the bus bar with screws 21 and 22.

The test lead contact portions 3101 and 3201 are partially widened from the front side of the residential distribution board so that the test leads can be easily contacted from the front side of the residential distribution board. It is formed in a shape. In addition, a test lead drop-off prevention means is provided that enables the test lead to be held in contact.

The test lead drop-off prevention means is provided with holes 3101a and 3201a provided in the test lead contact portions 3101 and 3201 so that the rod terminals of the test leads can be penetrated, and the angle between the back surface of the test lead contact portion and the bus bar is set. It is configured by providing an acute angle. The angle formed between the back surface of the test lead contact portion and the bus bar is such that the test lead does not slide down to the front side of the residential distribution board when the rod terminal of the test lead is inserted into the holes 3101a, 3201a. Preferably, it is formed at about 30 degrees to about 60 degrees.

In other words, when the rod terminal of the test lead is inserted into the hole and released, the depression angle when looking down the residential distribution board from the rod terminal side is configured to be an acute angle, more preferably the depression angle The diameter of the hole of the test lead drop-off preventing means is preferably about 3.4 mm with respect to the diameter (about 2 mm) of a general test lead bar terminal so as to be about 30 degrees to about 60 degrees.

(Structure of branch switch side voltage measurement unit)
Next, the structure of the branch switch side voltage measuring unit will be described with reference to FIGS. 11 and 12. FIG. 11 is a view of the branch switches in the lower row in FIG. 1 as seen from the power supply side terminal side.

As shown in FIG. 11, the branch switch 2 applied to the residential distribution board is divided into cases 20a and 20b that are divided in the width direction when the direction in which the branch switch 2 is provided is the width direction. Has a substantially box-shaped container.

The container body has a power supply side terminal portion 22B provided with a plug-in terminal selectively connected to the bus L1 or N, and a power supply side terminal 22A provided with a plug-in terminal connected to the bus L2. And a load-side terminal portion 23 configured by using quick connection terminals connected to conductors of respective poles for supplying power to the load side of the branch switch 2, these power-side terminal portions 22A, 22B and the main conductor of each pole that electrically connects between the load side terminal portion 23, and a fixed contact that is interposed in the main conductor of each pole and that electrically connects and disconnects the power supply side and the load side A movable contact fixed to each of the fixed contacts so as to be able to come in contact with and away from the fixed contact; an opening / closing mechanism for opening and closing the movable contact; and an opening / closing mechanism connected to the opening / closing mechanism by a link. Operation to be the first operation unit to turn on and off the electric circuit And bundle 24 is disposed.

When the surface on which the operation handle 24 serving as the first operation portion is provided is the front surface a of the body, the front surface is provided with a communication hole 21 that faces the power supply side terminal portion 22B from the front surface a side. ing. The communication holes 21 are provided at two locations in each position where the power terminal portion 22B is connected to the branch line N or L1.

Next, the power supply side terminal portions 22A and 22B will be described. The power supply side terminal portions 22A and 22B have a back surface b as a mounting surface to the distribution board with respect to the front surface a, and a side surface c adjacent to the front surface a and the back surface b. Sometimes, it is provided at one end of the side surface c in the longitudinal direction of the container so as to be sandwiched between the cases 20a and 20b.

Among the power supply side terminal portions, 22A is a terminal portion (referred to as a fixed terminal portion) disposed and fixed to the body, and when disposed in the lower row, it is connected to the branch line of L2, 22B Since the branch line L1 or N is selectively connected, the container body is reciprocally moved in the width direction so as to continuously reciprocate between one side and the other side. It is a terminal part (it is called a selection terminal part) arrange | positioned at the hollow part provided in the side surface.

In FIG. 1, the arrangement of branch lines connected to the branch switches in the upper column is such that a branch line of the bus L1 is provided at a location corresponding to the bus L2 in the lower column, and The branch lines of the bus lines N and L2 are disposed at locations corresponding to the bus lines N and L1, and in the branch switch disposed in the upper row, the fixed terminal portion is the branch line of the bus line L1. The selection terminal portion is selectively connected to a branch line of the bus N or L2.

(Selection terminal structure)
On the power source side of the body of the branch switch 2, a distribution board is provided so as to correspond to the position of the fixed terminal portion 22A that is fixedly disposed and the position of the selection terminal portion 22B that is movably provided. The connection part of three bus-bar L1, L2, N is previously arrange | positioned in the inside. In the case of FIG. 9, the fixed terminal portion 22A is connected to the branch line L2, and the selection terminal portion 22B is connected to the branch line N in the position of FIG. 9, and is connected to the bus line L1 in the other position. The

When the selection terminal portion 22B is connected to the bus L1, a voltage of 200 V is applied to the branch switch 2, and when the selection terminal portion 22B is connected to the branch line N, the branch switch 2 A voltage of 100V is applied.

FIG. 12 shows the selection terminal portion 22B and the blade receiver 22B3 accommodated in the selection terminal portion 22B. The fixed terminal portion 22A and the selection terminal portion 22B are blade holders formed into a shape in which a substantially U-shaped tip portion having a substantially cross-sectional shape is narrowed as a terminal for connecting to the bus bar. A certain plug-in terminal 22B3 is accommodated. The blade receiver 22B3 sandwiches the branch line of the bus at the narrowed portion and supplies power to the load side.

The selection terminal portion 22B is configured as a non-charging portion whose outer shell is not electrically connected to the blade receiver 22B3. A hole 22B4 corresponding to the communication hole 21 provided in the container is provided on the front side of the outer shell. When the selection terminal portion 22B is moved to the connection positions on one side and the other side in the width direction of the body, the one communication hole 21 and the hole 22B4 are connected to each other. The lead terminal of the test lead can be inserted from the front side of the branch switch.

The opening 71 in the bus bar insulating cover 7 is formed so as to expose the communication hole 21 to the front side. For this reason, when the test lead is inserted into the communication hole 21 at the time of voltage measurement, there is no hindrance.

(About the operation structure of the selected terminal)
The second operation unit 25 that reciprocates the selection terminal unit 22B in the width direction of the container will be described with reference to FIGS.

First, a rack 22B1 provided with a plurality of teeth is formed on the front surface a side of the selection terminal portion 22B, and the operation of the second operation portion 25 is performed on the selection terminal portion 22B via a moving direction reversing means described later. Play a role to communicate. Further, a long rib 22B2 is provided in the width direction on the back side of the outer shell, and the rib 22B2 is fitted with a groove portion 21c provided on the body side so that the selection terminal portion 22B is in the width direction. Acts as a guide when reciprocating.

On the front side of the container, a second operation section 25 is provided for reciprocating the selection terminal section 22B in the width direction of the container. The second operation unit 25 includes a long rectangular base formed to be approximately half the length in the width direction of the container, a gripping unit 25a provided on the front side of the base, And a rack 25b provided with a plurality of teeth provided on the back side. The rack 25b is formed at the end of the long rib 25b1 formed on the base so as to be wider than the rib 25b1, and the second operation portion 25 is fitted into the opening 21b3 provided in the body. When working, it acts as a guide part for moving in the width direction and also serves as a retaining to the front side.

When the second operation unit 25 moves in the width direction of the container, the second operation unit 25 continuously reciprocates between two positions near one side and the other side of the container. Then, at each of the positions near one side surface and the other side surface, the communication hole 21 located in the portion serving as the back surface of the base by the base, that is, the device on the side where the selection terminal portion 22B is not located. The communication hole 21 provided on the front surface a side of the body is concealed.

For this reason, from the front side of the body, the communication hole on the side where the selection terminal portion 22B is not visible cannot be seen, and the communication hole on the side where the selection terminal portion 22B is located becomes visible.

For this reason, when confirming how much the supply voltage to the circuit breaker is, it can be done by inserting the bar terminal of the test lead into the communication hole 21 on the side visible on the front side of the body, Since the communication hole 21 on the unnecessary side is concealed, it is possible to prevent the rod terminal from being inserted into an incorrect communication hole.

Further, on the back side of the base, on the front side of the body of the branch switch 2, the branch switch 2 is connected to the branch line of the selection terminal portion 22B over the width direction of the body. A voltage display unit 27 for displaying the supplied voltage value is provided.

With respect to the width direction of the container, a character of 100V, which is the first supply voltage, is displayed near one side from approximately the center, and a voltage of 200V, which is the second supply voltage, is displayed near the other side from approximately the center. Characters are displayed. Similarly to the case where the above-described unnecessary communication hole is concealed, the voltage display unit 27 located in the portion serving as the back surface of the base is concealed by the base and is not visible from the front side, and is not concealed by the base. The voltage display part located becomes visible from the front side. For this reason, the planned supply voltage to the branch switch can be accurately displayed in advance at each position of the selection terminal portion 22B.

The opening 71 of the bus insulation cover 7 is formed so that the communication hole 21 and the voltage display unit are exposed to the front side, and therefore hinders the operation of inserting the test leads during voltage measurement and the visual recognition of the voltage display unit. Absent. Then, coupled with the effect that the communication hole on the side where the selection terminal portion is not located is concealed by the base, the grasp of the voltage value to be supplied to the branch switch and the actual voltage measurement confirmation work can be performed from the front side of the branch switch. It is possible to provide a structure of a bus insulation cover that is easy to perform while maintaining electrical safety and has excellent workability.

Next, the moving direction reversing means for interlocking the second operation unit 25 and the selection terminal unit 22B will be described with reference to FIG. 14, FIG. 15, and FIG.

The moving direction reversing means moves the selection terminal portion 22B in a direction opposite to the direction in which the second operation portion 25 is moved. That is, in FIG. 16, when the second operation part 25 is moved from the position (a) to the position (c), the selection terminal part 22B moves in the opposite direction to the second operation part. In the present embodiment, an example in which a pinion 26 is used as the moving direction inverting means will be described.

The pinion 26 is formed by providing a plurality of teeth around the shaft 26a. The teeth are engaged with the rack 25b provided in the second operation portion 25 so as to mesh with the rack 25b provided in the second operation portion 25 and the rack 22B1 provided in the selection terminal portion 22B. It arrange | positions so that it may be located between rack 22B1 provided in selection terminal part 22B. The pinion 26 is disposed near the front surface of the circuit breaker body, with a shaft 26a pivotally supported by a bearing portion 21d formed by recessing a part of the body.

FIG. 15 is a partial cross-sectional view showing the arrangement state of the second operation unit 25, the pinion 26, and the selection terminal unit 22B on the container. A pinion 26 is disposed between the second operation portion 25 and the selection terminal portion 22b, and the teeth of the pinions pivotally supported by the racks 25b and 22B1 so that the shaft 26a is pivotable by the container are engaged.

Next, the case where the position of the selection terminal portion 22B is moved by operating the second operation portion 25 will be described with reference to FIGS.

For example, FIGS. 16A and 16B show a case where the bus L2 is connected to the fixed terminal 22A and the bus N is connected to the selection terminal 22B. FIGS. Shows a case where the bus L2 is connected to the fixed terminal portion 22A and the bus L1 is connected to the selection terminal portion 22B.

First, FIGS. 16A and 16B show the case where the bus L2 is connected to the fixed terminal portion 22A and the bus N is connected to the selection terminal portion 22B, so the voltage supplied to the circuit breaker. The value is 100V. On the front side where the selection terminal portion 22B is located, the communication hole 21a4 on the side where the selection terminal portion 22B is not located and a part of the voltage display portion 27 are concealed by the base of the second operation portion 25, and the selection terminal portion 22B is The communication hole 21b4 on the side where it is located and a part of the voltage display part 27 appear. In this case, the voltage display unit 27 displays 100V characters.

Next, from this state, when the second operating portion 25 is started to slide from the initial position to the other side surface in the drawing, a rack 25b and a pinion 26 provided on the back side of the second operating portion 25 are shown. The pinion begins to rotate counterclockwise in the figure due to the meshing of the teeth. At the same time, the force is transmitted to the rack 22B1 provided on the front side of the selection terminal portion 22B meshing with the teeth of the pinion 26, and the second operation portion 25 is moved in the direction opposite to the sliding direction. start. Since the rack and pinion teeth have a one-to-one correspondence, the amount of movement of the second operation unit 25 and the amount of movement of the selection terminal unit 22B are the same, and the second operation unit 25 is moved to the other side surface. When the movement is completed, the selection terminal portion 22B is also moved from the initial position to the other side surface (FIGS. 16C and 16D).

In this state, since the bus L2 is connected to the fixed terminal portion 22A and the bus L1 is connected to the selection terminal portion 22B, the voltage value supplied to the circuit breaker is 200V. On the front side where the selection terminal portion 22B is located, the communication hole 21b4 on the side where the selection terminal portion 22B is not located and a part of the voltage display portion 27 are concealed by the base of the second operation portion 25, and the selection terminal portion 22B is The communication hole 21a4 on the side where it is located and a part of the voltage display part 27 appear. In this case, the voltage display unit 27 displays 200V characters.

Since the selection terminal portion 22B is moved in the direction opposite to the direction in which the second operation portion 25 is slid, the selection terminal portion 22B is always on the front side at the position where the selection terminal portion 22B is connected to the bus. In addition, the display of the voltage value scheduled to be supplied to the branch switch and the communication hole on the side where the selection terminal portion 22B is located are exposed.

Provided on the side where the selection terminal portion is not located, the display portion for the voltage value to be supplied to the branch switch and the communication hole are located on the back side of the base of the second operation portion 25 and are concealed. Therefore, when the terminal part is faced from the front side of the device body, the position of the plug-in terminal, the communication hole exposed on the front surface of the device body, and the voltage display unit cooperate to open and close the branch Which branch switch is selected and connected visually, even before the switch and bus are selectively connected, and after the branch switch and bus are connected, The voltage value to be supplied can be grasped before actually being supplied to the load circuit, and the voltage measurement operation can be easily and directly performed.

In addition, since almost the entire surface of the terminal portion of the body that is not concealed by the second operation unit can be used as the voltage display unit, the voltage value that is expected to be supplied can be displayed large, and the visibility Therefore, it is possible to provide a structure that is less likely to cause an error in voltage measurement work for a person working in a high place or a narrow place and has high voltage measurement workability.

Note that the blade holder of the selection terminal part and the main conductor inside the branch switch are connected using a stranded wire, so that there is a margin for the amount of movement so as not to hinder continuous movement in the width direction. It is said that it has a length.

Moreover, the voltage display in the voltage display unit is not only displayed by characters, but also by color-coding at a substantially central part in the width direction of the body, and by describing the type of bus (branch line) to be connected. You may go. In order to identify the voltage to be supplied, the color classification may be configured such that red and white, red and black have different hues, and lightness and saturation are different. Also, the bus type may be displayed as characters such as L1 and N, or may be displayed using symbols, and color coding and display using characters and symbols may be combined.

Further, as shown by 28 in FIG. 16, when the second operation unit 25 is moved in the width direction on the front side of the power supply side terminal unit of the container, the back side of the second operation unit 25 The protrusions 28 may be provided so as to contact and elastically get over. Accordingly, when the second operation unit 25 is moved from one position to the other position, an appropriate click feeling can be obtained by overcoming the convex portion 28, and the operator can select visually and tactilely. It can be recognized that the terminal portion 22B has been switched.

(About the measurement of supply voltage)
When measuring the power supply voltage supplied to the branch switch 2, the bus insulation cover 7 is attached to a predetermined position with the operation handle 24 turned off after the branch switch 2 is connected to the bus. In this state, one of the rod terminals of the test lead of the voltage measuring device is inserted into the communication hole 21 on the side where the selection terminal portion 22B is located from the front surface a side of the device body, and the blade holder enclosed in the selection terminal portion 22B. The load of the branch switch is brought into contact with the plug-in terminal 22B3 or the branch line to which the plug-in terminal is connected, and the other rod terminal of the test lead is brought into contact with the bus-side voltage measuring unit. The voltage supplied to the branch switch is measured without supplying power to the side.

At this time, since the bus side voltage measuring unit is provided with a test lead drop prevention means, the test lead does not fall out of the bus side voltage measuring unit even if the test lead is released, and the voltage measuring operation with good workability. Can be performed.

When measuring the power supply voltage for the branch switch in the upper row, the bus side voltage measuring unit 31 is used, the bar terminal of one test lead is held by the bus side voltage measuring unit 31, and the other side Are sequentially brought into contact with the branch switch side voltage measuring units 204, 203, 202, 201, and then when performing voltage measurement work on the branch switches in the lower row, The bar terminal held by the bus side voltage measuring unit 31 is removed and held by the bus side voltage measuring unit 32, and the other bar terminal is connected to the branch switch side voltage measuring units 208, 207, 206, 205. It is advisable to perform the voltage measurement work by bringing them into contact in order.

If the power supply voltage supplied to the branch switch is different, the branch switch is once removed from the bus bar, and then the position of the selection terminal portion 22B is switched and attached to a predetermined position again. At this time, even if the operator mistakenly tries to switch the position of the selection terminal portion with the branch switch attached to the bus bar, the suppression unit 72 suppresses the movement of the operation unit 25 that operates the power supply switching unit. Therefore, the operation unit 25 and the power supply side terminal 22B can be prevented from being damaged. Further, since the operator can visually recognize that the operation unit 25 should not be operated with the branch switch 2 attached to the busbar, in addition to physical suppression, double electrical safety can be achieved. The voltage can be confirmed with good workability.

As described above, when measuring the power supply voltage supplied to the branch switch, first, the handle 24 is operated to the off side, and the bus bar insulation cover 7 is left attached, and the front surface of the container body is attached. The test lead bar terminal of the voltage measuring device is inserted into the communication hole exposed on the side, that is, one of the test lead bar terminals is held by the test lead drop prevention means of the bus side voltage measuring unit. The other end of the bar terminal of the test lead is connected to the plug-in terminal 22B3 included in the selection terminal portion 22B or the terminal 22B3 by being inserted into the communication hole on the side exposed when viewed from the front surface a side of the body. The voltage supplied to the branch switch can be measured without supplying power to the load side of the branch switch by contacting the branch line. Not exposed Et al., The operator may perform the test lead measured for communicating hole exposed.

For this reason, it is difficult to cause an error in power supply voltage measurement, and since the voltage value to be supplied is displayed by the voltage display unit 27, the measurement result from the voltage measuring device is different from the voltage display. Can easily recognize that some abnormality has occurred, and can work toward resolution of the abnormality at an early stage. In the present embodiment, in addition to voltage measurement for each individual circuit breaker, insulation measurement between the upper bus-side voltage measurement unit and the lower branch switch-side voltage measurement unit, and lower bus-bar Insulation measurement between the side voltage measurement unit and the upper branch switch side voltage measurement unit can also be performed between the phases, which helps to solve the electrical abnormality.

(Second embodiment)
The bus bar insulation cover according to the second embodiment will be described with reference to FIGS. The difference from the first embodiment is that no voltage measurement unit is provided on the bus side, and voltage measurement is performed only on the branch switch side. That is, in the bus bar insulation cover 7 in the second embodiment, each branch switch is replaced with the opening 73 corresponding to the bus side voltage measurement units 31 and 32 formed in the bus bar insulation cover of the first embodiment. The opening 74 corresponding to the blade holder included in the fixed terminal portion 102 </ b> A provided at the top is formed. In the branch switch, a communication hole 101ab4 corresponding to the blade holder included in the fixed terminal portion 102A is provided on the front side of the branch switch in addition to the communication hole corresponding to the selection terminal portion 102B.

In this branch switch, a conductor 102A1 extending in the front direction of the body is connected to a blade holder included in the fixed terminal portion 102A, and a hole that can contact the conductor 102A1 is formed on the front surface of the body. A communication hole 101ab4 is formed on the side. The end portion of the conductor 102A1 is bent in an L shape, and the bent portion 102A1a is disposed so as to be fitted to the rib of the container. When the measurement pin of the voltage measurement tester is inserted from the communication hole 101ab4, the pressing force is received by the L-shaped portion.

In the branch switch 2 of the present embodiment, as shown in FIGS. 19A and 19B, the selection terminal portion 102B is positioned by the second operation unit 105 in accordance with the position of the selection terminal portion 102B. The communication hole on the side not to be connected (101a4 in (a), 101b4 in (b)) is concealed, and the communication hole on the side where the selection terminal portion 102B is always exposed is exposed to the front side.

In the bus-insulated cover 7, in addition to the opening 71 that exposes the communication hole 101a4 or 101b4 on the side where the selection terminal portion 102B is located on the front side, an opening 74 is formed at a position corresponding to the communication hole 101ab4. doing. For this reason, in a state where the bus bar insulating cover 7 is attached at a predetermined position, each of the communication hole 101a4 or 101b4 and the communication hole 101ab4 is exposed to the front side.

When measuring how much voltage is supplied to the circuit breaker 1, first, the handle 104 is operated to the off side, and then the voltage is applied to the communication hole exposed on the front side of the body. Insert the measurement pin of the measurement tester, that is, insert one of the measurement pins of the voltage measurement tester into the communication hole (101b4 or 101a4) on the side where the selection terminal portion 102B is located from the front surface a side of the body. By making contact with the terminal 102B3 included in the portion 102B or a bus connected to the terminal 102B3, the other of the measurement pins is inserted into the communication hole 101ab4 and brought into contact with the conductor 102A1 extending from the fixed terminal portion 102A. The supplied voltage can be measured without supplying power to the load side of the circuit breaker.

As in the first embodiment, if the power supply voltage supplied to the branch switch is different, the branch switch is temporarily removed from the bus, and then the position of the selection terminal unit 102B is switched. Reattach it in place. At this time, even if the operator erroneously tries to switch the position of the selection terminal portion while the branch switch is attached to the bus bar, the suppression unit 72 suppresses the movement of the operation unit 105 that operates the power supply switching unit. Therefore, the operation unit 105 and the power supply side terminal 102A can be prevented from being damaged. In addition, since the operator can visually recognize that the operation unit 105 should not be operated with the branch switch 2 attached to the busbar, in addition to physical suppression, double electrical safety can be achieved. There is an advantage that the voltage can be confirmed with good workability.

(Third embodiment)
A bus bar insulation cover according to a third embodiment will be described with reference to FIGS. The difference from the first embodiment is that the part of the opening 71 in the bus insulation cover 7 is replaced with the first opening 75 for confirming the voltage display of the voltage display part in the branch switch 2 and the branch switch. The second opening portions 76a and 76b for performing the voltage measurement work by inserting the test leads into the power supply voltage measuring portion 2 in FIG.

Both the first opening 75 and the second openings 76a and 76b are provided in the vicinity of the second operation unit 25 for operating the voltage switching means provided in the branch switch 2.
The first opening 75 is provided on the front surface side of the voltage display unit 27 of the branch switch 2, and the second openings 76a and 76b are formed in the communication hole 21 serving as a power supply voltage measurement unit of the branch switch. Provided on the front side.

The first opening 75 is displayed at a position closer to one side and a position closer to the other side as the second operating portion 25 of the branch switch 2 reciprocates in the width direction of the body. In order to expose the voltage display portion 27 to the front side, a hole portion is provided so that the voltage display portion can be confirmed with approximately the width of the container.

The second openings 76a and 76b are a first position and a first position of the power connection terminal that can be taken at a position near one side of the second operation part 25 of the branch switch 2 and a position near the other side, respectively. The first and second communication holes 21b4 and 21a4 serving as the first and second power supply voltage measuring units that are selected according to the second position and exposed on the front side are provided on the front side. One communication hole of the communication holes is concealed by the second operation portion 25, so that one of the second openings disposed on the front surface side of the communication hole is also Only the voltage measurement unit that is hidden from the front side by the second operation unit 25 and that should perform voltage measurement is exposed to the front side.

The procedure for measuring the power supply voltage is the same as that in the first embodiment, but the first opening 75 for confirming the voltage display and the second opening for performing the voltage measurement operation. Since the parts 76a and 76b are provided separately from each other, it is easy for the operator to distinguish between the voltage display and the opening used in the voltage measurement work, and the operator explicitly defines the measurement part for voltage measurement. This makes it easier to check and measure the supply voltage with good workability.

(About installation of branch switch)
Next, we will supplement the method of mounting the branch switch to the bus.

The branch switch is attached from the direction in which the branch line extends. In FIG. 15, when installing the branch switch 2, the branch switch is mounted on the branch switch mounting plate 3 so that the power supply side terminal 22B of the branch switch faces the branch line, and the direction of the branch line The power supply side terminal portion 22B is pressed against the branch line and attached.

The power supply side terminal of the branch switch 2 is composed of a plug-in terminal in which both one common terminal 22A and one selection terminal 22B can be connected without the need for screw tightening. Is pushed in the direction of the branch line, the plug-in terminal holds the branch line and completes the connection with the branch line.

When switching the voltage in some branch switches, once remove the branch switch from the bus, move the position of the selection terminal 22B of the branch switch to the other, and then press it again in the direction of the bus. To install. At this time, the position of the selection terminal 22B in the branch switch is visually changed, and the positional relationship of the branch line connected to the selection terminal 22B is changed. Can clearly grasp the magnitude of the voltage value to be supplied to the branch switch, and can easily determine visually whether or not the connection is correct, which increases the work efficiency of voltage measurement and prevents incorrect connections. It can be prevented as much as possible, and the effect of preventing electrical failure of the load equipment can be expected.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the first embodiment, as a test lead drop-off prevention means in the bus side voltage measuring unit, in addition to a simple round hole, a hole is formed in a daruma-type, and the size of each hole is changed, thereby changing You may comprise so that a bar terminal of this may become caught easily. More specifically, the upper hole may be formed smaller than the lower hole so that the bar terminal can be easily caught.

Alternatively, using a quick-connecting terminal structure as a means for preventing the test lead from falling off by pressing a target object against a copper member used as a connecting means for a terminal block of an electric wire by means of a spring, the rod terminal is more reliably inserted and removed. You may comprise. Also in this case, it is preferable to provide the insertion port toward the front side of the residential distribution board so that the bar terminal can be easily inserted.

Further, in order to hold the main body of the voltage measuring instrument on the residential distribution board side, the holding means of the voltage measuring instrument main body may be provided on the residential distribution board.

In this case, the voltage measuring device main body or a hook that can be hooked with the carrying belt provided on the measuring device main body is attached to the case of the residential distribution board to form a holding means, or the voltage measuring device main body You may comprise the pocket part which can be accommodated in the case of the distribution board for houses.

When the voltage measuring instrument is held by the holding means of the voltage measuring instrument main body, a holding angle adjusting means is provided so that the voltage reading unit (meter, monitor, etc.) of the voltage measuring instrument main body is easily visible to the operator. More preferably, the voltage value reading unit can be held in the direction of the operator.

DESCRIPTION OF SYMBOLS 1 Main switch 2 Branch switch 3 Mounting plate 4 Mounting plate 5 Insulation member 6 Insulating wall 7 Bus insulation cover 11 Bus (L1)
12 Bus (L2)
13 Bus (N)
100 Internal unit 1101a L1 branch line 1201a L2 branch line 1301a N branch line 21 Communication hole 22A Power supply side terminal 22B Power supply side terminal 23 Load side terminal 24 Operation handle 25 Operation part 26 Pinion 27 Voltage display part 71 Opening part 72 Suppression Part 73 opening part 74 opening part 75 1st opening part 76a, 76b 2nd opening part

Claims (4)

Inside the cabinet,
A main switch connected to each of the first voltage electrode, the second voltage electrode and the neutral electrode of the single-phase three-wire circuit;
A branch switch connected to any two buses among the buses of each pole disposed on the secondary side of the main switch and the buses of each pole, and Branching by selectively connecting the power connection terminal to the two buses by moving and arranging the power connection terminal to the corresponding position by either the first position or the second position by the voltage switching means A branch switch that supplies power at a voltage suitable for the circuit;
A bus insulation cover structure in a residential distribution board comprising a bus insulation cover that covers the opening side of the cabinet on the front side with respect to the bus and maintains insulation on at least the front side of the bus,
The bus insulation cover is formed with an opening that escapes the movement locus of the operation unit for operating the power supply switching means provided in the branch switch in a state of being attached at a predetermined position inside the cabinet. As the suppression unit that engages with the operation unit that operates the switching unit and suppresses the operation of the operation unit, the suppression unit is configured by providing a rib on the movement locus of the operation unit in the opening. Busbar insulation cover for residential distribution boards.
An opening formed in the bus insulation cover escapes a power supply voltage measurement unit provided in the branch switch for measuring a power supply voltage supplied to the branch circuit, and the power supply voltage measurement unit is moved to the front side. bus insulation cover structure according to claim 1 Symbol placement of residential distribution board is opened so as to expose, characterized in that it is configured to.
Inside the cabinet,
A main switch connected to each of the first voltage electrode, the second voltage electrode and the neutral electrode of the single-phase three-wire circuit;
A branch switch connected to any two buses among the buses of each pole disposed on the secondary side of the main switch and the buses of each pole, and Branching by selectively connecting the power connection terminal to the two buses by moving and arranging the power connection terminal to the corresponding position by either the first position or the second position by the voltage switching means A branch switch that supplies power at a voltage suitable for the circuit;
A bus insulation cover structure in a residential distribution board comprising a bus insulation cover that covers the opening side of the cabinet on the front side with respect to the bus and maintains insulation on at least the front side of the bus,
In the vicinity of the operation unit for operating the voltage switching means provided in the branch switch, the power supply connection terminal is provided across the first position and the second position,
A first opening portion that exposes a voltage display portion of a branch switch that displays a voltage supplied according to the position of the power connection terminal to the front side;
A distribution board for a house characterized by comprising a second opening for escaping the power supply voltage measurement section provided in the branch switch and exposing the power supply voltage measurement section to the front side. Busbar insulation cover structure.

The second opening is
Provided on the front side of each of the first and second power supply voltage measuring units that are selected according to the first position and the second position of the power connection terminal provided on the branch switch and exposed to the front side. 4. The bus bar insulation cover structure for a residential distribution board according to claim 3, wherein the structure is constructed as described above.

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