JP2008263720A - Lead-in branch terminal box, connecting member therefor and distribution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily secure a space for a lead-in branch box in additionally installing a lead-in wire without displacing a pole-mounted transformer or an arm installed to an electric pole, and to facilitate distribution work in a short time when additionally installing the lead-in wire. <P>SOLUTION: The lead-in branch terminal box 20 branches and connects the lead-in wire as a load-side electric wire 12 led into each customer to a low-voltage power transmission line as a power-supply side electric wire 5 which is distributed with power from a high-voltage power transmission line 2 via the pole-mounted transformer 6 so that power can be fed to a plurality of customers from the high-voltage power transmission line 2 distributed to the electric pole A. The lead-in branch terminal box comprises: the power supply side electric wire 5; a first connecting terminal 24 connected with the load-side electric wire 12 and a crossover 5a for feeding crossover power from the power-supply side electric wire 5 when additionally installing the load-side electric power 12; and a second connecting terminal 25 connected with the load-side electric wire 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a load-side electric wire drawn into each consumer to a low-voltage transmission line as a power-side electric wire distributed from the high-voltage transmission line via a pole transformer so that power can be supplied to each consumer from the high-voltage transmission line. The present invention relates to a lead-in branch terminal box for branch-connecting lead-in wires, a connecting member thereof, and a power distribution method.

  In describing this type of conventional lead-in branch terminal box, the configuration of the utility pole will be described first. For example, as shown in FIG. 5, the utility pole A is distributed below the first arm 1 and a first arm 1 for supporting a three-phase high-voltage transmission line 2 supported horizontally at the upper end thereof. A low-voltage power transmission line as the power supply side wire 5, a pole transformer 6 fixed below the power supply side wire 5, a second arm 10 attached directly below the pole transformer 6, In general, it includes a retractable arm 15 attached so as to be orthogonal to the second arm 10.

  The first arm 1 is provided with a plurality of insulators 3 on its upper surface, and the high-voltage power transmission lines 2 are insulated and supported by the insulators 3.

  The second arm 10 has a T-shape in plan view, a main support portion 10a parallel to the first arm 1, and an auxiliary support portion 10b supported in a direction orthogonal to the main support portion 10a. As with the first arm 1, three insulators 11 are arranged on the auxiliary support portion 10b.

  A branch line 2 a T-branched from the high-voltage power transmission line 2 is insulated and supported by each insulator 11 of the auxiliary support portion 10 b and connected to the primary side of the pole transformer 6. A power supply side electric wire (three-phase four-wire low-voltage transmission line) 5 is distributed from the secondary side of the pole transformer 6.

  In the lead-in arm 15, a lead-in branch terminal box 50 for branching and connecting the lead-in wire as the load-side electric wire 12 from the power-side electric wire 5 is arranged according to the number of customers. For example, when power is distributed to four customers in a three-phase four-wire system (including power), a total of four lead-in branch terminal boxes 50 are arranged as shown in FIG. That is, three lead-in branch terminal boxes 50 to which the two load-side electric wires 12 are connected are provided on the front surface of the arm metal 15, and the lead-in branch terminal box 50 to which the load-side electric wire 12 that is a neutral wire is connected is the arm metal 15. One is arranged on the rear surface. In addition, the distribution diagram at the time of distributing electricity from the power supply side electric wire 5 to each drawing branch terminal box 50 is shown in the solid line frame of FIG.

  As shown in FIG. 7, the lead-in branch terminal box 50 has a substantially rectangular parallelepiped box 51 having an opening on the front surface, a lid plate 52 that closes the front opening, and a corner provided in the box 51. A columnar conductor 53, and a first connection terminal 54 and a second connection terminal 55 that are screwed into the conductor 53 are configured. And the 1st connection terminal 54 is larger diameter than the 2nd connection terminal 55 so that the power supply side electric wire 5 may be connected, and it is arrange | positioned at the lower end part of the box 51, On the other hand, the 2nd connection terminal 55 is a load It is smaller in diameter than the first connection terminal 54 so that the side electric wires 12 are connected, and is arranged in order from the next to the first connection terminal 54 toward the upper end of the box 51.

As another conventional lead-in branch terminal box, one having a box attached to a utility pole and a pair of upper and lower connection terminals arranged in parallel in the box is known. The power supply side electric wire is connected to the lower connection terminal, and the load side electric wire is connected to the upper connection terminal via a fuse.
Japanese Patent No. 3025884

  However, in the case of the lead-in branch terminal box 50 shown in FIG. 7, the number of the second connection terminals 55 to which the load-side electric wires 12 are connected, that is, power cannot be supplied to a maximum of four consumers, so that five or more. In order to supply electric power to other consumers, it is necessary to newly attach the lead-in metal 15 to the utility pole A. At this time, if there is no space for newly attaching the pull-in arm 15 on the utility pole A, the mounting position of the pole transformer 6 and the second arm 10 must be shifted to secure the space, and the lead-in branch terminal box There is a problem that the wiring work for 50 requires a lot of time and labor.

  Further, in the case of the lead-in branch terminal box of the above publication, it is necessary to secure a space for attaching the box to the utility pole, and when the number of boxes is increased, the production cost of the box is increased, and the cost is increased accordingly. Moreover, it may be possible to shift the mounting position of the pole transformer, arm, etc. by extension, or to manufacture a box having a different size each time a terminal block is added inside the box.

  Therefore, in view of the above problems, the present invention makes it easy to expand the extension branch terminal box when adding load-side wires without shifting the mounting position of pole transformers and arms attached to the power pole. It is an object of the present invention to provide a lead-in branch terminal box, a connecting member thereof, and a power distribution method that can be ensured in a simple manner and can perform power distribution work at the time of expansion in a short time.

  In order to solve the above-mentioned problem, the lead-in branch terminal box according to the present invention can be supplied from the high-voltage power transmission line 2 to the pole transformer 6 so that power can be supplied to a plurality of consumers from the high-voltage power transmission line 2 arranged on the utility pole A. In the lead-in branch terminal box for branching and connecting the lead-in wire as the load-side wire 12 drawn into each consumer to the low-voltage transmission line as the power-side wire 5 distributed through the power source, the power-side wire 5 and the load-side wire 12 When the load side electric wire 12 is added, the first connection terminal 24 to which the crossover wire 5a connected to supply power from the power source side electric wire 5 is connected and the second connection terminal 24 to which the load side electric wire 12 is connected. A plurality of connection terminals 25 are provided.

  In this case, since the power supply side electric wire 5 is not connected from the pole transformer 6 to each lead-in branch terminal box on the extension side, power is distributed by the crossover wire 5a. It becomes easy and can be done in a short time.

  Moreover, according to this invention, the structure which provides said 1st connection terminal 24 according to the number of the power supply side electric wires 5, the load side electric wires 12, and the crossover electric wires 5a added can also be employ | adopted.

  In this case, it can easily cope with the expansion.

  Further, according to the present invention, one of the first connection terminals 24 is disposed at one end, and the other is arranged in parallel at the other end, and each second connection terminal 25 is connected to the first connection terminal 24 at the first end. It is also possible to employ a configuration in which one connection terminal 24 and the first connection terminal 24 at the other end are arranged in parallel.

  In this case, since the 1st connection terminal 24 comes to be arrange | positioned at both ends, the cross wire 5a can be pulled out from any one edge part of the drawing branch terminal box 20. FIG. That is, if the lead-in branch terminal boxes are arranged in series so that the end portions thereof face each other, power can be supplied over the shortest distance.

  In addition, the connecting member of the lead-in branch terminal box according to the present invention is configured to connect any of the lead-in branch terminal boxes 20 in the vertical direction or the horizontal direction.

  In this case, the layout for connecting the lead-in branch terminal boxes 20 can be changed according to the installation status of equipment such as pole transformers and switches mounted on the utility pole A and the installation environment of the utility pole A. For example, each pull-in branch terminal box 20 may be connected in the vertical direction with the pull-in branch terminal box 20 in the vertical direction or horizontal direction, and each pull-in branch in the state in which each pull-in branch terminal box 20 is in the vertical direction. The terminal boxes 20 may be connected in parallel, or the service branch terminal boxes 20 may be connected in series or in parallel with the service branch terminal boxes 20 in the horizontal direction.

  Further, according to the present invention, the connecting member 30 has a rectangular parallelepiped lead-in branch terminal box 20 having a longer side than the vertical dimension of the rectangular tube-shaped arm metal 15 arranged in the horizontal direction in a vertically long state. A pair of support parts 31 that are arranged vertically and are connected to each other and having a length slightly larger than the long side of the lead-in branch terminal box 20 so as to form an insertion port through which the arm metal 15 can be inserted. While abutting on the front surface and the rear surface of the arm metal 15, the connecting part 35 fixed between the support parts 31 abuts on the lower surface of the arm metal 15, and is detachable across the upper end parts of the support parts 31. A front end portion or a rear portion of the upper attachment portion 36 is attached so that the upper attachment portion 36 to be attached contacts the upper surface of the arm metal 15 and the upper surface of the lead-in branch terminal box 20 can be detachably attached to the lower surface of the upper attachment portion 36. Extend from at least one of the ends The protruding portions 36a and 36b are formed, and the lower mounting portion 38 is attached across the lower ends of the support portions 31, while the upper surface of the lead-in branch terminal box 20 is detachably attached to the lower surface of the lower mounting portion 38. It is also possible to adopt a configuration in which extending portions 38a and 38b extending from at least one of the front end portion and the rear end portion of the lower mounting portion 38 are formed so as to be able to do so.

  In this case, both support portions 31 are in contact with the side surfaces of the arm metal 15, and the connecting portion 35 is in contact with the lower surface of the arm metal 15. In this state, the upper attachment portion 36 is attached to the upper end portions of the both support portions 31. Therefore, the position of the connecting member 30 can be reliably fixed with respect to the arm bracket 15. In addition, it is only necessary to attach the lower mounting portion 38 to the lower end portions of the support portions 31 when expanding, and the lead-in branch terminal box 20 can be easily arranged up and down. Furthermore, since at least one of the front end part or the rear end part of the upper attachment part 36 and the lower attachment part 38 is formed with the extension parts 36a, 36b, 38a, 38b so that the lead-in branch terminal box 20 can be attached, The lead-in branch terminal box 20 can be freely arranged on the front, rear, left and right.

  Further, the power distribution method according to the present invention is a power distribution method in the case of adding a lead-in wire as a load-side wire 12 branch-connected to a low-voltage power transmission wire as a power-side wire 5 distributed to the utility pole A, 5. One of the three first connection terminals 24 to which the load wire 12 and the cross wire 5a connected to supply power from the power wire 5 when the load wire 12 is added are connected. While being provided at the upper end, two are arranged in parallel at the lower end, and the load-side electric wire 12 is connected between the first connection terminal 24 at the upper end and the upper first connection terminal 24 at the lower end. The pull-in branch terminal boxes 20 in which a plurality of second connection terminals 25 are arranged in parallel are connected and fixed to the arm metal 15 in a state where they are arranged in columns and rows by the connecting members 30. , Upper side at the lower end While connecting the power supply side electric wire 5 to the 1st connection terminal 24, the load side electric wire 12 is connected to the 1st connection terminal 24 and each 2nd connection terminal 25 of an upper end part, respectively, and the lower 1st connection terminal in a lower end part 24 and the first connection terminal 24 at the upper end of each lower lead-in branch terminal box 20, and the upper side at each second connection terminal 25 and the lower end of the lower lead-in branch terminal box 20. The load-side electric wires 12 are connected to the first connection terminals 24, respectively, and the lower first connection terminal 24 at the lower end is left open.

  In this case, since the first connection terminals 24 of the lead-in branch terminal boxes 20 arranged on the upper and lower sides are connected by the cross wire 5a, either one of the side portions of the arm metal 15 divided around the utility pole A is used. Thus, the normal power distribution work of the load-side electric wire 12 to the power distribution work by extension can be completed. That is, it is possible to perform power distribution work easily, in a short time, and at low cost without newly providing a metal brace 15 and without shifting the mounting positions of the pole transformer 6 and the switch. Furthermore, since one of the first connection terminals 24 is in an empty state, it is possible to easily increase the number of connections by simply connecting the line 5a over the first connection terminal 24.

  As described above, according to the present invention, it is possible to supply the power from the power supply side electric wire by the crossover line in the power distribution work in the lead-in branch terminal box when adding, so that the efficiency of the power distribution work can be improved. There is an effect that can be done.

  Hereinafter, a lead-in branch terminal box, a connecting member thereof, and a power distribution method according to an embodiment of the present invention will be described with reference to FIGS.

  As with the conventional lead-in branch terminal box 50 shown in FIG. 7, the lead-in branch terminal box 20 has a substantially rectangular parallelepiped box 21 having an opening on the front surface, a lid plate 22 that closes the front opening, a box It is composed of a prismatic conductor 23 housed in the body 21, a first connection terminal 24 and a second connection terminal 25 screwed into the conductor 23, and the vertical length of the lead-in branch terminal box 20 is in the horizontal direction It is longer than the height dimension of the side surface of the pulling-in armature (hereinafter simply referred to as an armrest) 15 in the shape of a rectangular tube. As shown in FIG. 1, the difference is that the power supply side electric wire 5, the load side electric wire 12 and the crossover wire 5 a connected to supply power from the power supply side electric wire 5 when the load side electric wire 12 is added. Are respectively provided with a plurality of first connection terminals 24 and second connection terminals 25 to which the load side electric wires 12 are connected, and the two first connection terminals 24 are arranged in parallel at one end (lower end). In addition, one first connection terminal 24 is provided at the other end (upper end), and three second terminals are provided between the upper first connection terminal 24 at the lower end and the first connection terminal 24 at the upper end. Connection terminals 25 are arranged in parallel. Further, the lead-in branch terminal box 20 is arranged in the vertical direction by a connecting member 30 described later.

  The connecting member 30 includes a pair of support portions 31 having a length that is slightly larger than the long side of the lead-in branch terminal box 20, and a connection portion 35 having both end portions fixed integrally to the opposing surfaces of the both support portions 31. The upper mounting portion 36 is detachably mounted across the upper end portions of the support portions 31, and the lower mounting portion 38 is mounted straddling the lower end portions of the support portions 31. The both support portions 31, the connecting portion 35, and the upper mounting portion 36 form an angular annular insertion port through which the arm metal 15 can be inserted.

  The support portion 31 is formed of a cylinder having a length slightly larger than the long side of the lead-in branch terminal box 20, and has male threads 32 formed at the upper end portion and the lower end portion thereof, and the upper attachment portion 36 and the lower attachment portion 38. A nut N for fixing the screw is screwed together. Then, it contacts the front and rear surfaces of the arm metal 15 along the vertical direction.

  The upper mounting portion 36 is formed of a flat plate, and through holes 37 through which the male screw 32 of the support portion 31 passes are formed at both ends thereof. Also, a front extension 36a formed to extend forward from the front end of the upper attachment 36 so that the upper surface of the lead-in branch terminal box 20 can be detachably attached to the lower surface of the upper attachment 36, and a rear end And a rear extension portion 36b formed to extend rearward.

  The lower attachment portion 38 is formed of a flat plate like the upper attachment portion 36, and through holes 39 through which the lower external thread 32 of the support portion 31 passes are formed at both ends. A front extending portion 38a formed to extend forward from the front end portion of the lower mounting portion 38 so that the upper surface of the lead-in branch terminal box 20 can be detachably attached to the lower surface of the lower mounting portion 38, and a rear end And a rear extension 38b.

  Next, regarding the power distribution method, a power distribution method for a predetermined number of consumers will be described with reference to FIGS. That is, when the load-side electric wire 12 is drawn into the customer of one block (1 to 4 units) shown in the solid line frame in FIG. 4, the upper mounting portion 36 of the connecting member 30 is first connected to the upper end portions of the support portions 31. The U-shaped connecting member 30 is inserted from below the arm metal 15 in a state where it is removed from the arm metal 15, the inner surfaces of both support portions 31 are brought into contact with the front and rear side surfaces of the arm metal 15, and the upper surface of the coupling portion 35 is It is brought into contact with the lower surface of the arm metal 15.

  Then, the male screw 32 on the upper side of both support portions 31 is passed through the through hole 37 of the upper mounting portion 36, the lower surface of the upper mounting portion 36 is brought into contact with the upper surface of the arm metal 15, and the nut N is screwed onto the male screw 32. The upper attachment portions 36 are attached to both upper ends of the support portions 31, and the connecting member 30 is attached to the arm metal 15. In this case, although not shown, the two connecting members 30 are arranged in parallel on one side of the arm bracket 15.

  Next, in the state where the three lead-in branch terminal boxes 20 are in a vertically long state, that is, the two first connection terminals 24 arranged in parallel are located at the lower end, and the one first connection terminal 24 is located at the upper end. The upper surfaces of the two lead-in branch terminal boxes 20 are attached to the lower surfaces of the front extension portions 36a of the upper attachment portions 36, and the upper surface of the remaining one lead-in branch terminal box 20 is extended to the rear of one of the upper attachment portions 36. It attaches to the lower surface of the protrusion part 36b.

  Then, one spare is provided as a spare for adding the lower first connection terminal 24 at the lower end, and the power supply side electric wire 5 is connected to the upper first connection terminal 24 at the lower end and Four load-side electric wires 12 are connected to one connection terminal 24 and each second connection terminal 25.

  Next, the case where the load side electric wires 12 are added to one block shown in the chain line frame of FIG. 4 from the state where the power is distributed as described above, that is, to 5 to 8 consumers will be described. First, the lower male screw 32 of both support portions 31 is passed through the through hole 39 of the lower attachment portion 38, and the nut N is screwed into the male screw 32, so that the lower attachment portion 38 is connected to both lower ends of the support portions 31. Attach to the part. Then, below each existing service branch terminal box 20, each service branch terminal box 20 to be added is attached to the lower surface of the front extension 38a of the lower mounting part 38 of the connecting member 30 in a column, The first connection terminal 24 of the upper lead-in branch terminal box 20 left open and the first connection terminal of the lower lead-in branch terminal box 20 located at the shortest distance from the first connection terminal 24, that is, directly below. 24 is connected to the line 5a.

  And while connecting the load side electric wire 12 to be added to the remaining first connection terminals 24 and the plurality of second connection terminals 25 of the respective pull-in branch terminal boxes 20 on the lower side, the first connection terminals are used as spares for the addition. Leave one 24 open.

  The present invention is not limited to any of the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the number of consumers is increased after being distributed to a predetermined number of consumers (1 to 4 houses) has been described as an example. Shall work.

  Further, in the embodiment, the lead-in branch terminal boxes 20 are arranged side by side (vertically), but may be arranged side by side (row). Further, the connecting member 30 is not limited to that shown in the drawing, and any connecting member 30 may be used as long as it can be attached to the rectangular armature 15 and the lead-in branch terminal boxes 20 can be arranged vertically and / or front and rear. For example, an L-shape, a U-shape, or a connecting member that combines these may be used.

  Moreover, in the case of the said embodiment, although demonstrated taking the example of the three-phase four-wire distribution line in the power supply side electric wire 5, a single phase or a three-phase three-wire distribution line may be sufficient.

  Moreover, in the case of the said embodiment, although demonstrated taking the case of the bridge | crosslinking polyethylene insulation cable (CV cable) as an example of the power supply side electric wire 5 connected to the lead-in branch terminal box 20, in a city area etc. Needless to say, the present invention can also be applied to outdoor aluminum conductor polyethylene wires (MOE wires) used in places where securing is difficult or where aesthetics must be considered.

  In the case of the above embodiment, power is distributed from the low-voltage distribution line as the power supply-side electric line 5, but the electric line distributed from the secondary side of the pole transformer 6 may be directly connected.

The front view which shows the lead-in branch terminal box which concerns on one Embodiment of this invention. The front view of the state which arranged the lead-in branch terminal box of FIG. 1 up and down, and was wired. The side view of FIG. The schematic distribution diagram which wired the lead-in branch terminal box of FIG. Schematic which shows the structure of the utility pole in which the three-phase four-wire type high voltage power transmission line was arranged. The schematic distribution diagram which wired the wiring branch terminal box of the prior art example in parallel. The front view which shows the drawing-in branch terminal box of a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st arm, 2 ... High voltage power transmission line, 3 ... Insulator, 5 ... Power supply side electric wire (low voltage power transmission line), 5a ... Crossover wire, 6 ... Pillar transformer, 10 ... Second arm, 10a ... Main support part DESCRIPTION OF SYMBOLS 10b ... Auxiliary support part, 11 ... Insulator, 12 ... Load side electric wire (lead-in wire), 12 ... Load side electric wire, 15 ... Lead-in arm, 20 ... Lead-in branch terminal box, 21 ... Box body, 22 ... Cover plate, DESCRIPTION OF SYMBOLS 23 ... Conductor, 24 ... 1st connection terminal, 25 ... 2nd connection terminal, 30 ... Connection member, 31 ... Support part, 32 ... Male screw, 35 ... Connection part, 36 ... Upper attachment part, 36a ... Front extension part, 36b ... rear extension part, 37 ... through hole, 38 ... lower mounting part, 38a ... front extension part, 38b ... rear extension part, 39 ... through hole, A ... utility pole, N ... nut,

Claims (6)

  A power supply side electric wire (5) distributed from the high-voltage power transmission line (2) through the pole transformer (6) so that power can be supplied to a plurality of consumers from the high-voltage power transmission line (2) disposed on the power pole (A). ) In the lead-in branch terminal box for branch-connecting the lead-in wire as the load-side wire (12) drawn into each consumer to the low-voltage transmission line as the power source wire (5), the load-side wire (12) and the A first connection terminal (24) to which a crossover wire (5a) connected to supply power from the power supply side electric wire (5) when the load side electric wire (12) is added, and a load side electric wire ( A lead-in branch terminal box comprising a plurality of second connection terminals (25) to which 12) is connected.   The said 1st connection terminal (24) is provided according to the number of wires of the power supply side electric wire (5), the load side electric wire (12), and the crossover electric wire (5a) to be expanded. Lead-in branch terminal box.   One of the first connection terminals (24) is disposed at one end, and the other is arranged in parallel at the other end, and each second connection terminal (25) is a first connection terminal at one end. 3. The lead-in branch terminal box according to claim 2, wherein the lead-in branch terminal box is arranged between the first connection terminal (24) and the first connection terminal (24) at the other end.   A connecting member for a lead-in branch terminal box, wherein the lead-in branch terminal box (20) according to any one of claims 1 to 3 is configured to be connectable in a vertical direction or a horizontal direction.   The connecting member (30) includes a rectangular parallelepiped lead-in branch terminal box (20) having a longer side than a vertical dimension of a rectangular tube-shaped arm (15) arranged in a horizontal direction. A pair of support parts which are connected to each other and have a length slightly longer than the long side of the lead-in branch terminal box (20) so as to form an insertion port through which the arm metal (15) can be inserted. (31) abuts on the front surface and the rear surface of the arm metal (15), respectively, and the connecting portion (35) fixed between the support portions (31) abuts on the lower surface of the arm metal (15), An upper mounting portion (36) that is detachably mounted across the upper ends of both support portions (31) abuts on the upper surface of the arm bracket (15), and further, a pull-in branch terminal is formed on the lower surface of the upper mounting portion (36). To attach the top surface of the box (20) in a detachable manner, the front end of the upper mounting portion (36) or An extension portion (36a, 36b) extending from at least one of the rear end portions is formed, and a lower attachment portion (38) is attached across the lower end portions of both support portions (31), An extension extending from at least one of the front end portion and the rear end portion of the lower attachment portion (38) so that the upper surface of the lead-in branch terminal box (20) can be detachably attached to the lower surface of the lower attachment portion (38). The connecting member according to claim 4, wherein protruding portions (38 a, 38 b) are formed.   A power distribution method for adding a lead-in wire as a load-side wire (12) branched and connected to a low-voltage transmission line as a power-side wire (5) distributed to the utility pole (A), the power-side wire (5) When the load side electric wire (12) and the load side electric wire (12) are added, the three first wires to which the crossover wire (5a) connected to supply power from the power source side electric wire (5) is connected One of the connection terminals (24) is provided at the upper end, and two of them are arranged at the lower end. Furthermore, the first connection terminal (24) at the upper end and the first connection terminal (24) at the upper end of the lower end. Between each of the lead-in branch terminal boxes (20) in which the plurality of second connection terminals (25) to which the load-side electric wires (12) are connected are arranged in parallel in columns and rows by the connecting members (30). Connected and fixed to the brace (15) in the arranged state, and each pull-in branch end on the upper side In the box (20), the power supply side electric wire (5) is connected to the upper first connection terminal (24) at the lower end, and the first connection terminal (24) and the second connection terminals (25) at the upper end are connected. Each load side electric wire (12) is connected, and the first connection terminal (24) on the lower side at the lower end and the first connection terminal (24) on the upper end in each lower branch terminal box (20). The wire (5a) is connected, and the load-side electric wires (12) are respectively connected to the second connection terminals (25) of the lower lead-in branch terminal box (20) and the upper first connection terminal (24) at the lower end. A power distribution method characterized in that the first connection terminal (24) on the lower side at the lower end portion is connected and left open.