JP5704693B2 - Power supply voltage measurement structure for load circuit of residential distribution board - Google Patents

Description

The present invention relates to a residential distribution board having a function of measuring the magnitude of a power supply voltage supplied to a branch switch connected to a bus provided in the residential distribution board and supplying power to each branch circuit. In particular, the connection between the bus bar and the branch switch is made by plug-in, and the magnitude of the power supply voltage supplied to the branch switch is convenient in a state in which the operation handle for switching the electric circuit of the branch switch is turned off. It relates to a residential distribution board with a function that can be measured with good quality.

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 301 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.

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

In residential distribution boards with a voltage switching structure on the bus side as described above,
A connection bar and a feed plate used as the voltage switching structure, and a switching screw and a switching member associated with the connection bar and the feed plate, as well as many member constituent members such as a switching piece and a cylindrical conductor, are required for assembling them. Combined with man-hours, it is difficult to reduce costs.

Also, when operating the switching screw for voltage switching, it is necessary to loosen the switching screw once, move the position of the switching screw, and tighten the screw again. Temporarily, the specified tightening torque of the switching screw If the switching operation is completed in a state that does not reach the threshold, there is a risk that the electrical safety cannot be sufficiently maintained. In principle, the voltage switching operation is performed with the main switch turned off. However, if the operation is performed without turning off the main switch, 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 addition, since the branch switch has a structure in which a voltage measuring unit is provided at each pole on the load side, normally, when performing voltage measurement, an operator should handle two test leads with chopsticks. While holding the voltage measuring instrument with one hand and holding the voltage measuring instrument with the other hand, the test leads are brought into contact with the voltage measuring sections of each branch switch arranged on the residential distribution board in turn. Every time I checked the voltage measuring instrument.

The distribution board for houses is often arranged near the ceiling or inside the storage, and is not necessarily arranged in a place where voltage measurement work is easily performed. For example, it is not easy to hold a voltage measuring device in one hand and hold two test leads with the other hand so that the operator makes contact with a predetermined voltage measuring unit in the branch switch while climbing on a ladder. Often not. For this reason, it is difficult for the predetermined voltage measuring unit to check, the test lead may not be brought into contact with the voltage measuring unit, or the test lead may inadvertently touch a place different from the voltage measuring unit. There was a problem that safety could not be maintained sufficiently.

Therefore, the present invention has been made in view of the above problems,
Before supplying power to the load circuit from a branch switch with a plug-in terminal structure provided on a residential distribution board, before actually turning on the operation handle of the branch switch, supply the voltage supplied to the branch switch. Furthermore, it aims at providing the distribution board for houses provided with the voltage measurement structure which can confirm with sufficient workability | operativity.

The power supply voltage measurement structure to the load circuit of the residential distribution board according to the present invention is configured to solve the above-described problem,

Applied between the plug-in terminals connected to two predetermined buses among the buses of the first voltage electrode, the second voltage electrode and the neutral electrode having different potentials arranged on the residential distribution board. The magnitude of the power supply voltage supplied from the branch switch to the load circuit in the branch switch that supplies the load circuit to the load circuit when the operation handle for turning on and off the contact device provided on the branch switch is turned on For each branch switch, the power supply voltage measurement structure for confirming that the operation handle is turned off, wherein the power supply voltage measurement structure is a power supply voltage measurement structure for each of the first voltage electrode and the second voltage electrode. A first and second bus-side voltage measuring unit provided on the bus and commonly used for a plurality of branch switches connected to the bus; and more electrically than the contact device in the branch switch Provided on the plug-in terminal side, A Toki switch branch switch-side voltage measurement unit used individually for the at earnestly state the operating handle of the breaker switch, two test leads of the voltage measuring device used to measure the power supply voltage One of the test leads is kept in contact with the first or second bus side voltage measuring unit, and the other test lead is individually brought into contact with each of the branch switch side voltage measuring units. The power supply voltage applied to the load circuit of the residential distribution board can be measured so that the power supply voltage applied between the plug-in terminals connected to the two predetermined buses in the branch switch can be measured. A measurement structure may be constructed.

According to such a configuration,
When the operation handle of the branch switch is turned off and the operation handle of the main switch is turned on, the power supplied to the branch switch is connected to the primary side of the branch switch connected to the bus. Is actually applied, voltage measurement work can be performed before supplying power to the load circuit from the branch switch, and only one test lead for voltage measurement to be brought into contact with each branch switch Therefore, the voltage measurement operation can be performed with good workability and while maintaining electrical safety.

The power supply voltage measuring structure for the load circuit of the residential distribution board according to the present invention is a test lead for holding the test lead when the test lead is brought into contact with the bus side voltage measuring unit. You may comprise a drop-off prevention means.

According to such a configuration,
When the test leads are brought into contact with the first and second busbar side voltage measuring units that are commonly used for a plurality of branch switches, the test leads can be separated from the test leads. As a result, the degree of freedom of the body increases, workability is improved, and electrical safety is also increased.

Further, the power supply voltage measurement structure to the load circuit of the residential distribution board according to the present invention is such that the surface side on which the operation handle of the branch switch is provided is the front side with respect to the surface side on which the branch switch is attached. A voltage measurement communication hole for contacting the test lead from the front side with respect to the branch switch side voltage measurement unit electrically connected to the plug-in terminal as a voltage measurement target. It may be configured.

According to such a configuration, the test lead can be surely brought into contact with the plug-in terminal which is a voltage measurement target in the branch switch, so that the test lead used on the branch switch side is easily brought into contact. Combined with good workability, the electrical safety can be further enhanced.

As described above, according to the present invention, before supplying power to the load circuit from the branch switch provided in the residential distribution board, the voltage actually supplied to the branch switch is set to the operation handle of the branch switch. It is possible to provide a residential distribution board having a voltage measurement structure that can be confirmed with good workability before turning on.

The internal unit unit perspective view in the distribution board for houses which shows 1st Embodiment is shown. The principal part perspective view which concerns on the same embodiment is shown. The branch line perspective view concerning 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 assembly drawing of the bus-bar which concerns on the 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 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 concerns on other embodiment is shown. The figure which removed the connection bar cover is shown. The figure which faced from the front side of FIG. The figure which accommodated the connection bar in the connection bar cover 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 to 3, the residential distribution board includes a main switch 1 and a bus 11 connected to a secondary side of the main switch 1 via a connection member (not shown) inside the cabinet. 12, 13, and an internal device such as a branch switch 2 connected to each of the buses is incorporated as an internal unit 100 attached to the mounting plates 3 and 4. Used. 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. 9, 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. 9) of the branch switch 2 is connected to the buses 11 (L1) and 12 (N), 100V is supplied, and the buses 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. 1), 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. 3 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.

(Assembly structure of busbar)

Next, the assembly structure of the bus will be described with reference to FIGS. FIG. 4 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).

Among 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. 1, 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. 1, branch lines 1101a and 1301a and 1101b and 1301b that are selectively connected to the branch switch 2 among the branch lines are connected 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, assembly of the internal unit 100 will be described with reference to FIGS.
First, in FIG. 5, the bus 11 of the voltage electrode L1 and the bus 12 of the voltage electrode L2 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. 2, 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.

Next, as another embodiment, a structure of a connection bar side voltage measurement unit provided instead of the bus side voltage measurement unit will be described with reference to FIGS. 19 to 22. FIG. 19 shows the main switch 1, the mounting plate 4, the connection bars 110, 120, and 130 that connect the secondary side of the main switch 1 and the bus bars 11 to 13, and the connection bar cover 14 that covers the connection bar. Yes. FIG. 20 shows a view in which the connection bar cover 14 is removed for explanation. FIG. 21 shows a view of FIG. 19 from the front side. FIG. 22 shows a view in which the connection bars 110, 120, and 130 are arranged on the connection bar cover 14. The connection bar cover 14 insulates and holds the connection bar of each pole. Note that the bus-side voltage measurement units 31 and 32 in FIG. 1 are used in a detached state.

The connection bar 110 is L1 which is a first voltage electrode, the connection bar 120 is L2 which is a second voltage electrode, and the connection bar 130 is N which is a neutral electrode. Each connection bar is screwed to the bus bar at the connection bar connection portion provided at the end portions 11a, 12a, 13a of the bus bars 11 to 13 in FIG. Therefore, in FIG. 20, the connection portions provided at the end portions 110l, 120l, and 130l of the connection bar are provided in accordance with the height of the front side of the connection bar connection portion provided at the end portion of the busbar. The connecting portion of the sex electrode is arranged so as to be located on the most front side.

The connecting bar is bent so that each pole does not interfere with contact.
The connection bar 110 of L1 extends in the load side direction of the main switch 1 from the connection part 110a with the main switch (110b part), and then is bent in a direction perpendicular to the direction (110c part). Further, it is folded back in the direction opposite to the load side direction (110d portion). Then, the connection bar extends along the load side surface of the main switch 1 (110e portion), is bent to the power source side of the main switch 1 (110f) and extends (110g portion), and the connection bar connection at the busbar Folded to the front side in the vicinity of the part (110h part), bent to form the connecting bar side voltage measuring part (110j part) (110i part), and stepped toward the connecting bar connecting part connecting part in the bus (110k).

The connection bar 130 of L2 extends from the connection part 130a to the main switch in the load side direction of the main switch 1 (130b part), and is then bent in a direction perpendicular to the direction (130c part). Further, it is folded back in the direction opposite to the load side direction (130d portion). Then, the connection bar extends along the side of the load side of the main switch 1 (130e portion), and is then bent to the power source side of the main switch 1 (130f) and extended (130g portion) to connect the connection bar at the busbar. It is bent in the vicinity of the portion (130j portion) and extends toward the connecting portion of the bus bar connecting portion.

The connection bar 120 of L3 extends from the connection part 120a to the main switch in the load side direction of the main switch 1 (120b part), and is then bent in a direction perpendicular to the direction (120c part). Further, it is folded back in the direction opposite to the load side direction (120d portion). Then, the connection bar extends along the side of the load side of the main switch 1 (120e portion), and is then bent to the power source side of the main switch 1 (120f) and stretched (120g portion). The connecting bar side voltage measuring part (120j part) is bent in the vicinity of the part, and is bent stepwise toward the connecting bar connecting part connecting part in the bus (120k).

Here, the connection bars of L1, L2, and N are formed with different lengths to the front side of the bent portions (110c, 120c, and 130c) to avoid contact interference between the connection bars.
On the other hand, in order to make the height seen from the front side of the connection bar side voltage measuring units 110j and 120j, the length of the part (110h part) that is once bent to the front side in the connection bar of L1 is adjusted. Formed.

The connection bar cover 14 is formed of a resin body so as to cover these connection bars from the outside and keep them insulated. Partition walls 1405 and 1406 for insulating and holding the connection bars are formed inside the connection bar cover 14, and support claws 1401, 1402, 1403 and 1404 that prevent the connection bars from being attached when the connection bars are attached are connected to the power supply side. It is provided in the part (110g, 120g, 130g) which extends in the direction.

The portions (110j, 120j) that serve as the connection bar side voltage measurement unit are formed to be on the most front side of the connection bar. Since the operator performs voltage measurement work from the front side, if it is located on the back side from other members, it is expected that the workability will be impaired, and inadvertent contact with other members will cause electrical accidents. This is because there is a concern that it may occur. For this reason, in the internal unit in the distribution board for houses, it forms so that the said connection bar side voltage measurement part may be located in the forefront side.

As the connection bar-side voltage measurement unit, a hole is provided in the connection bar cover 14 and the connection bars 110 and 120 so that the test leads can be inserted. For the sake of explanation, the holes provided on the connection bar side are referred to as first holes 111 and 121, and the holes provided on the connection bar cover side are referred to as second holes 141a and 142a.

These holes, when the vertical direction is the vertical direction when mounting to the wall surface of the residential distribution board,
The center of the second hole is arranged so as to be biased upward with respect to the center of the first hole. This is to prevent the test lead from falling off by engaging the test lead with the first hole inner surface and the second hole inner surface when the operator inserts the test lead in communication. . More specifically, even if the tip portion of the test lead comes into contact with the inner surface of the first hole and the base portion of the test lead comes into contact with the lower surface of the inner surface of the second hole, the test lead is released. The test lead is engaged with each hole by its own weight.

In addition, the connection bar side voltage measurement unit is provided at the voltage poles 110 and 120 of the connection bars 110, 120, and 130, similarly to the bus side voltage measurement units 31 and 32.

(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. 9 and 10. FIG. 9 is a view of the branch switches in the lower row in FIG. 3 as seen from the power supply side terminal side.

As shown in FIG. 9, the branch switch 2 applied to the residential distribution board has cases 20 a and 20 b 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 are
The side surface in the longitudinal direction of the container body is defined as a back surface b which is 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. It is provided at one end of c so as to be sandwiched between 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. 3, the branch lines connected to the branch switches in the upper column are arranged such that a branch line of the bus L1 is provided at a location corresponding to the bus L2 in the lower column, 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. 4, 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. 10 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.

(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.

Combined with the above-described effect that the communication hole is concealed by the base, it is easy to grasp the voltage value to be supplied to the branch switch and to confirm the actual voltage measurement from the front side of the branch switch. A structure for voltage measurement can be provided.

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 FIGS.

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. 14, 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. 13 shows a partial cross-sectional view of the arrangement 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.

As an example, FIGS. 14A and 14B show a 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, and 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. 14A and 14B show a 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, and thus 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. 14C and 14D).

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. 14, 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 the power supply voltage supplied to the branch switch 2 is measured, after the branch switch 2 is connected to the bus, the operation handle 24 is turned off and the test lead bar terminal of the voltage measuring instrument is turned off. One side 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 container, and the plug-in terminal 22B3 or the plug-in terminal which is a blade holder included in the selection terminal portion 22B is connected. By making contact with the branch line, the other bar terminal of the test lead is brought into contact with the bus side voltage measurement units 31 and 32 or inserted into the connection bar side voltage measurement units 141 and 142, so that the branch switch The voltage supplied to the branch switch can be measured without supplying power to the load side.

At this time, since the bus side voltage measuring unit and the connection bar side voltage measuring unit are provided with a test lead drop prevention means, the test lead is connected to the bus side voltage measuring unit and the connection bar side even if the test lead is released. It is possible to perform voltage measurement work with good workability without dropping from the voltage measurement unit.

When the power supply voltage is measured for the branch switches in the upper row, the bus side voltage measuring unit 31 or the connection bar side voltage measuring unit 141 is used, and the bar terminal of one test lead is measured for the bus side voltage. 31 or the connecting bar side voltage measuring unit 141, and the other bar terminal is brought into contact with the branch switch side voltage measuring units 204, 203, 202, 201 in order, and then the lower side terminal When performing a voltage measurement operation on the branch switch in the row, the bar terminal held by the bus side voltage measurement unit 31 or the connection bar side voltage measurement unit 141 is removed, and the bus side voltage measurement unit 32 or the connection bar is removed. The voltage measurement operation may be performed by holding the other voltage terminal in contact with the branch switch-side voltage measurement units 208, 207, 206, and 205 in order after being held by the side voltage measurement unit 142.

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 then the communication hole exposed on the front side of the body is opened. On the other hand, the rod terminal of the test lead of the voltage measuring device is inserted, that is,
One of the test lead bar terminals is held by the test lead drop-off prevention means of the bus side voltage measuring unit or the connection bar side voltage measuring unit, and the other of the test lead bar terminals is exposed when viewed from the front side a of the body. By inserting it into the communication hole on the side where it is connected, it is brought into contact with the plug-in terminal 22B3 included in the selection terminal portion 22B or the branch line connected to the terminal 22B3, and a power source is connected to the load side of the branch switch Without being supplied, the voltage supplied to the branch switch can be measured, and communication holes that are not necessary for voltage measurement are not exposed on the front side, so the operator can measure the test leads for the exposed communication holes. Just do it.

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. Moreover, in this embodiment, in addition to voltage measurement for each circuit breaker, insulation measurement between phases can be performed.

  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, as a test lead dropout prevention means in the bus side voltage measurement unit or connection bar side voltage measurement unit, in addition to a simple round hole, a hole is formed in a daruma-shaped shape, and the size of each hole is changed to change the test lead. 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, the test lead can be formed by forming a fast connection terminal structure in the bus bar side voltage measurement unit or the connection bar side voltage measurement unit to press and connect the object to the copper member used as the connection means of the terminal block of the electric wire with a spring. You may comprise so that it may use as a drop-off prevention means, and may more reliably insert and remove a bar terminal. 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 holding means is configured by attaching a hook that can be hooked to the voltage measuring device main body or the carrying belt provided in the measuring device main body to the case in the residential distribution board,
You may comprise the pocket part which can accommodate a voltage measuring device main body, attaching to 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.

(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.

1 Main Switch 2 Branch Switch 3 Mounting Plate 4 Mounting Plate 5 Insulating Member 6 Insulating Wall 11 Bus (L1)
12 Bus (L2)
13 Bus (N)
100 Internal unit 1101a L1 branch line 1201a L2 branch line 1301a N branch line 14 Connection bar cover 110 Connection bar 111 First hole 120 Connection bar 121 First hole 130 Connection bar 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

Claims (5)

Applied between the plug-in terminals connected to two predetermined buses among the buses of the first voltage electrode, the second voltage electrode and the neutral electrode having different potentials arranged on the residential distribution board. The magnitude of the power supply voltage supplied from the branch switch to the load circuit in the branch switch that supplies the load circuit to the load circuit when the operation handle for turning on and off the contact device provided on the branch switch is turned on For each branch switch, the power supply voltage measuring structure for confirming that the operation handle is turned off,
The power supply voltage measurement structure is:
First and second bus side voltage measurement provided in each bus of the first voltage electrode and the second voltage electrode and commonly used for a plurality of branch switches connected to the bus. And
Provided on the plug-in terminal side more electrically than the contact device in the branch switch,
A branch switch side voltage measurement unit used individually for each branch switch,
With the operation handle of the branch switch turned off,
Of the two test leads of the voltage measuring instrument used for measuring the power supply voltage,
With one test lead in contact with the first or second bus side voltage measurement unit,
By bringing the other test lead into contact with each branch switch side voltage measurement unit individually,
A power supply voltage measurement structure to a load circuit of a residential distribution board that can measure a power supply voltage applied between plug-in terminals connected to the predetermined two buses in the branch switch.
2. The residential distribution board load circuit according to claim 1, further comprising a test lead drop-off preventing unit that holds the test lead when the test lead is brought into contact with the bus-side voltage measuring unit. Supply voltage measurement structure.
The branch switch side voltage electrically connected to the plug-in terminal for voltage measurement when the surface side on which the operation handle of the branch switch is provided is the front side with respect to the surface side on which the branch switch is mounted. The load circuit for a residential distribution board according to claim 1 or 2, wherein a voltage measuring communication hole for bringing the test lead into contact with the measuring unit from the front side is provided in a branch switch. Supply power voltage measurement structure to.
The power supply voltage measurement structure is:
Instead of the bus side voltage measurement unit,
To the connection bar that connects the secondary side of the main switch and the busbar for each pole,
The first and second connection bar side voltage measurement unit provided in common for a plurality of branch switches connected to the bus,
As the connection bar side voltage measurement unit,
4. The residential distribution board load circuit according to claim 1, further comprising a first hole for inserting the test lead. 5. Supply voltage measurement structure.
Covering the front SL connection bar, in connection bar cover to prevent inadvertent contact with the said connection bar,
A second hole for connecting the test lead to the first hole is provided on the front side of the first hole, and the vertical direction is set to the vertical direction when the housing distribution panel is attached to the wall surface. If
The center of the second hole portion is disposed so as to be biased upward with respect to the center of the first hole portion,
When the test leads are connected and inserted,
The supply voltage to the load circuit of the residential distribution board according to claim 4, wherein the test lead is engaged with the inner surface of the first hole and the inner surface of the second hole to prevent the test lead from falling off. Measurement structure.

Images